1. A real load impedance output type electric energy meter detection system is characterized in that,

the system comprises a data processing platform, an MCU (microprogrammed control unit), a reactor control unit, an information acquisition unit, a program-controlled reactor and a program-controlled load box;

the data processing platform is provided with an operation interface and can process the acquired data information;

the MCU main control unit is provided with a processor and is used for realizing message interaction with the data processing platform, so that the MCU main control unit can control subordinate equipment;

the reactor control unit is provided with an up-down control area and an inductive reactance adjusting area and is used for controlling the up-down electricity of the program control reactor and changing reactive compensation;

the information acquisition unit is provided with an integrated voltage and current acquisition module and is used for acquiring input signals which are actually input into the electric energy meter to be detected by the program-controlled reactor and the program-controlled load box;

the program-controlled reactor is a single-phase program-controlled adjustable reactor and can steplessly and smoothly adjust inductive reactive current;

the program control load box is used for outputting a preset load and is connected with the program control reactor in parallel or in series;

the data processing platform converts the received operation instruction into a corresponding control instruction and transmits the control instruction to the MCU control unit;

the MCU control unit sends a command to the reactor control unit and the program control load box after receiving the control command;

the reactor control unit controls the program-controlled reactor to cooperate with the program-controlled load box to output a required input signal for detection to the detected electric energy meter;

the information acquisition unit acquires input signals which are actually input into the electric energy meter to be detected by the program-controlled reactor and the program-controlled load box and uploads the acquired input signals to the data processing platform;

the data processing platform compares the theoretical requirement value with the received input signal to obtain an error, and more effectively adjusts the depth of reactive compensation according to the error value to realize accurate detection of the real load impedance parallel output type electric energy meter.

2. The real load impedance output type electric energy meter detecting system as recited in claim 1,

the MCU main control unit adopts an STM32F1xx series processor with a 32-bit ARM core, has rich peripheral equipment and good stability, and is provided with a 232-to-485 module;

the input signal comprises current input voltage, current, power factor, active power, reactive power and apparent power.

3. The real load impedance output type electric energy meter detecting system as recited in claim 1,

the program control reactor comprises a winding for generating inductive reactance and a reactor transmission machine capable of changing the number of turns of the winding;

the program control reactor drives the windings inside the program control reactor to generate relative angular displacement through the reactor transmission machine, so that the effective turns of the windings are changed and synthesized, the inductive reactance is changed, and the depth of reactive compensation is adjusted.

4. A real load impedance output type electric energy meter detecting system as claimed in claim 3,

the inductive reactive current of the program control reactor is determined by the three-phase voltage connection phase sequence of a reactor transmission machine, the positive connection is increased, the phase change is reduced, and the inductive reactive current is realized by controlling two alternating current contactors through a group of relays;

the program control reactor is provided with a travel switch so as to realize automatic stop when the program control reactor outputs to the maximum value or the minimum value;

the program control reactor realizes the working state of the program control reactor and the operation control of a reactor transmission machine by utilizing the on-off of the relay.

5. The real load impedance output type electric energy meter detecting system as recited in claim 1,

the program-controlled load box is a 25KW program-controlled adjustable load box and comprises an 8U standard cabinet, the adjustment resolution of the cabinet is 0.1A, and the adjustment range is 0-100A.

6. A real load impedance output type electric energy meter detecting system as claimed in any one of claims 1 to 5,

the system also comprises a state indicating unit, an alternating current program control source, an on-off relay, a relay K2, a movable relay K3, a conversion relay K4, a forward contactor KM1 and a reverse contactor KM 2;

the state indicating unit is provided with an indicating lamp and is used for displaying the running states of the program control reactor and the load box;

the alternating current program control source is used for supplying power to the detection system, the detection system is three-phase four-wire power supply, a voltage output end of the alternating current program control source is provided with a UH loop, and the UH loop is used for being connected with an L-end current loop of the detected electric energy meter in series;

the voltage input ends of the program control load box and the program control reactor are respectively connected with the voltage output end of the alternating current program control source in parallel;

the on-off of the on-off relay realizes the on-off of the detection system;

the on-off of the relay K2 realizes the intervention of the program control reactor;

the coil of the forward contactor KM1 or the reverse contactor KM2 is powered up and down by switching on and off the movable relay K3;

the normally open contact of the dynamic relay K3 is respectively connected with the middle dynamic contact of the conversion relay K4 and a U loop of three-phase four-wire power supply;

the conversion type relay K4 realizes that one of the forward rotation contactor KM1 or the reverse rotation contactor KM2 is selected to be closed;

a normally open static contact of the conversion type relay K4 is connected with a coil at one side of the forward contactor KM1, and a normally closed static contact is connected with a coil at one side of the reverse contactor KM 2;

three groups of contacts of the forward contactor KM1 are respectively connected with a U loop, a V loop and a W loop of three-phase four-wire power supply;

three groups of contacts of the reversal contactor KM2 are respectively connected with a W loop, a V loop and a U loop of three-phase four-wire power supply and are connected into a control coil of a reactor transmission machine;

an STM32F1xx series processor of the MCU master control unit, wherein one group of IO ports are provided with output modules for controlling system electrification, program control reactor intervention, reactor transmission machine positive and negative rotation and running state indication;

STM32F1xx series processors, wherein a group of IO ports are provided with multiplexing modules, USART functions are mapped, and the USRT functions are matched with an isolation 485 communication chip and externally connected with a data processing platform and a program control load box to carry out message interaction and realize function control;

STM32F1xx series processor, wherein a group of IO ports set up the analog input module to start corresponding ADC function, be used for the voltage value of real-time collection high-power alternating current program control source input, the current value and corresponding power factor, power produced by real load, and with the comparative analysis of current setting parameter, the automatic circuit protection that cuts off of overrange.

7. A real load impedance output type electric energy meter detection method is characterized in that,

applied to a real load impedance output type electric energy meter detection system as claimed in any one of claims 1-6,

which comprises the following steps:

firstly, acquiring an input signal for detection required by a detected electric energy meter;

secondly, calculating an impedance value and an inductive reactance value according to the input signal in the first step;

thirdly, adjusting the output impedance of the program control load box and the output inductive reactance of the program control reactor according to the impedance value and the inductive reactance value in the second step;

fourthly, collecting input signals actually input into the electric energy meter to be detected;

fifthly, analyzing the deviation of current and power factor according to the actual input signal in the fourth step, and calculating the deviation current under the condition that the resistive load is determined;

sixthly, finely adjusting the output inductive reactance of the program control reactor and/or the output impedance of the program control load box according to the deviation current to correct the deviation current;

and seventhly, detecting the real load of the detected electric energy meter according to the corrected current.

8. The method as claimed in claim 7, wherein the step of detecting the real load impedance output type electric energy meter,

in the second step, the calculation of the impedance value and the inductive reactance value specifically includes the following steps:

when the program control load box is connected with the program control reactor in parallel:

according to the RL parallel model, the current generated by the inductive loop lags the current generated by the resistive loop by 90 degrees,

thus I_RObtained by dividing into I × cos θ

Same principle I_LObtained by multiplying I by sin theta

Wherein U is input voltage of AC program control source, I is total loop current of whole system, I_RR are respectively the current and impedance value of the resistive load loop, I_L、X_LAre respectively perceptualCurrent and inductive reactance value of the load loop;

according to the current triangle shape, the current of the current triangle,theta is I_RAnd I.

9. The method as claimed in claim 7, wherein the step of detecting the real load impedance output type electric energy meter,

in the third step, the impedance value of the program-controlled load box is adjusted, the impedance value is determined by the state of a gear relay inside the program-controlled load box, the corresponding impedance value is obtained by controlling the combination of the gear relays, and then the corresponding current value I can be output_R；

The inductive reactance value of the program control reactor is adjusted by controlling the reactor transmission machine inside the program control reactor, the reactor transmission machine is controlled to start and stop and rotate positively and negatively to obtain a corresponding inductive reactance value, and then the inductive reactance value can be combined with the program control load box to output a required current value I.

10. The method as claimed in claim 7, wherein the step of detecting the real load impedance output type electric energy meter,

in the fifth step, the calculation of the offset current specifically includes the following contents:

calculating Δ I ═ I₀-I；

In the sixth step, the correction of the offset current specifically includes the following contents:

according to

Obtaining the rotation angle of the reactor transmission machine of the program-controlled reactor

Wherein, Delta I is the difference between the theoretical current and the actual current, K is the proportionality constant of the rotating angle of the movable contact of the program control reactor and the inductance variation,the transformation ratio of the rotation angle of the movable contact and the transmission angle of the reactor transmission machine is obtained;

and the correction of the deviation current is realized by controlling the rotation angle of the reactor transmission machine.

Background

In order to guarantee the normal use of the functions of the intelligent electric meter, the intelligent electric meter needs to be comprehensively detected, the most common meter detection mode in the past is a virtual load test method, a detection system respectively outputs voltage and current to supply the meter, and the voltage, the current and the power factor are changed to simulate various use conditions of the electric energy meter. However, in the actual use process, the situation is more complicated, especially in the aspects of the arrearage tripping function of the intelligent electric meter and the durability of the internal related relay, the simulation condition is not good, the real situation cannot be simulated, and the detection is not perfect.

Chinese patent (publication) No. CN103983942A provides an intelligent electric energy meter calibrating device with switchable virtual and real loads and a method thereof, wherein the device comprises a programmable alternating current voltage source, a programmable alternating current electronic load, a single-phase/three-phase multifunctional character moving platform and a controller; the programmable alternating current voltage source is a dynamic simulation power supply; the programming alternating current electronic load is an RLC alternating current electronic load; the dynamic simulation power supply, the single-phase/three-phase multifunctional character-walking platform, the RLC alternating current electronic load and the control computer are sequentially connected; the control computer is connected with a dynamic simulation power supply, a single-phase/three-phase multifunctional character-walking table and an RLC alternating current electronic load. The method comprises a method for verifying the virtual load state and the real load state. The virtual load and the real load of the electric energy meter calibrating device can be switched, and the electric energy meter calibrating under the real load state better accords with the actual practical situation thereof, so that the calibrating result is more reliable.

According to the scheme, the required voltage is output through the dynamic simulation power supply, but the specific structure of the dynamic simulation power supply and how to generate the required input signal are not explained, so that the input signal for detection cannot be accurately generated, and the accurate detection of the intelligent electric energy meter is further influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a parallel output system provided with a program-controlled reactor and a program-controlled load box, which can respectively generate output signals which are independently controlled and used for detecting an electric energy meter, can independently and compositely output measurement signals required by detecting the electric energy meter, and can be flexibly applied according to actual conditions; meanwhile, the information acquisition unit is arranged, and the output signals of the programmable reactor and the programmable load box can be fed back and adjusted according to the real-time input signal data measured by the information acquisition unit, so that a detection closed loop is formed, the accuracy of the output signals is effectively improved, and the scheme is detailed, practical and feasible.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a real load impedance output type electric energy meter detection system,

the system comprises a data processing platform, an MCU (microprogrammed control unit), a reactor control unit, an information acquisition unit, a program-controlled reactor and a program-controlled load box;

the data processing platform is provided with an operation interface and can process the acquired data information;

the MCU main control unit is provided with a processor and is used for realizing message interaction with the data processing platform, so that the MCU main control unit can control subordinate equipment;

the reactor control unit is provided with an up-down control area and an inductive reactance adjusting area and is used for controlling the up-down electricity of the program control reactor and changing reactive compensation;

the information acquisition unit is provided with an integrated voltage and current acquisition module and is used for acquiring input signals which are actually input into the electric energy meter to be detected by the program-controlled reactor and the program-controlled load box;

the program-controlled reactor is a single-phase program-controlled adjustable reactor, can steplessly and smoothly adjust inductive reactive current, and has excellent stability and linearity;

the program control load box is used for outputting a preset load and is connected with the program control reactor in parallel or in series;

the data processing platform converts the received operation instruction into a corresponding control instruction and transmits the control instruction to the MCU control unit;

the MCU control unit sends a command to the reactor control unit and the program control load box after receiving the control command;

the reactor control unit controls the program-controlled reactor to cooperate with the program-controlled load box to output a required input signal for detection to the detected electric energy meter;

the information acquisition unit acquires input signals which are actually input into the electric energy meter to be detected by the program-controlled reactor and the program-controlled load box and uploads the acquired input signals to the data processing platform;

the data processing platform compares the theoretical requirement value with the received input signal to obtain an error, and more effectively adjusts the depth of reactive compensation according to the error value to realize accurate detection of the real load impedance parallel output type electric energy meter.

Through continuous exploration and tests, the programmable reactor and the programmable load box are arranged in parallel to form an output system, output signals which are independently controlled and used for detecting the electric energy meter can be respectively generated, and measurement signals required by detecting the electric energy meter can be independently or combinatorially output.

The invention can accurately generate the required input signal for detection, has detailed, practical and feasible scheme, and meets the detection requirement of the intelligent electric energy meter.

Meanwhile, the invention is provided with the information acquisition unit, and can feed back and adjust the output signals of the program-controlled reactor and the program-controlled load box according to the real-time input signal data measured by the information acquisition unit, thereby forming a detection closed loop and effectively improving the accuracy of the output signals.

Furthermore, the invention can realize the intervention and separation of the load program control load, and simultaneously can read the basic data information of voltage, current, power factor and the like in the test environment of the electric energy meter in real time; the load impedance can provide current output, and therefore the performance of the relay of the detected electric energy meter can be fully detected.

Furthermore, the detection system can simulate the real use condition of the electric energy meter, can test the durability of the tripping relay in the electric energy meter, has practical scheme and wide application range, and is popularized and used.

As a preferable technical measure:

the MCU main control unit adopts an STM32F1xx series processor with a 32-bit ARM core, has rich peripheral equipment and good stability, and is provided with a 232-to-485 module;

the input signal comprises current input voltage, current, power factor, active power, reactive power and apparent power.

As a preferable technical measure:

the program control reactor comprises a winding for generating inductive reactance and a reactor transmission machine capable of changing the number of turns of the winding;

the program control reactor drives the windings inside the program control reactor to generate relative angular displacement through the reactor transmission machine, so that the effective turns of the windings are changed and synthesized, the inductive reactance is changed, and the depth of reactive compensation is adjusted.

As a preferable technical measure:

the inductive reactive current of the program control reactor is determined by the three-phase voltage connection phase sequence of a reactor transmission machine, the positive connection is increased, the phase change is reduced, and the inductive reactive current is realized by controlling two alternating current contactors through a group of relays;

the program control reactor is provided with a travel switch so as to realize automatic stop when the program control reactor outputs to the maximum value or the minimum value;

the program control reactor realizes the working state of the program control reactor and the operation control of a reactor transmission machine by utilizing the on-off of the relay.

As a preferable technical measure:

the program-controlled load box is a 25KW program-controlled adjustable load box and comprises an 8U standard cabinet, the adjustment resolution of the cabinet is 0.1A, and the adjustment range is 0-100A; the load adopts a novel power consumption assembly, the power density is high, the red heat phenomenon does not exist, and the electric heating elements all accord with UL safety specifications.

As a preferable technical measure:

the system also comprises a state indicating unit, an alternating current program control source, an on-off relay, a relay K2, a movable relay K3, a conversion relay K4, a forward contactor KM1 and a reverse contactor KM 2;

the state indicating unit is provided with an indicating lamp and is used for displaying the running states of the program control reactor and the load box, so that the observation, the control and the regulation are convenient;

the alternating current program control source is used for supplying power to the detection system, the detection system is three-phase four-wire power supply, a voltage output end of the alternating current program control source is provided with a UH loop, and the UH loop is used for being connected with an L-end current loop of the detected electric energy meter in series;

the voltage input ends of the program control load box and the program control reactor are respectively connected with the voltage output end of the alternating current program control source in parallel;

the on-off of the on-off relay realizes the on-off of the detection system;

the on-off of the relay K2 realizes the intervention of the program control reactor;

the coil of the forward contactor KM1 or the reverse contactor KM2 is powered up and down by switching on and off the movable relay K3;

the normally open contact of the dynamic relay K3 is respectively connected with the middle dynamic contact of the conversion relay K4 and a U loop of three-phase four-wire power supply;

the conversion type relay K4 realizes that one of the forward rotation contactor KM1 or the reverse rotation contactor KM2 is selected to be closed;

a normally open static contact of the conversion type relay K4 is connected with a coil at one side of the forward contactor KM1, and a normally closed static contact is connected with a coil at one side of the reverse contactor KM 2;

three groups of contacts of the forward contactor KM1 are respectively connected with a U loop, a V loop and a W loop of three-phase four-wire power supply;

three groups of contacts of the reversal contactor KM2 are respectively connected with a W loop, a V loop and a U loop of three-phase four-wire power supply and are connected into a control coil of a reactor transmission machine;

an STM32F1xx serial processor of the MCU main control unit, wherein a group of IO ports are provided with multiplexing modules, USART functions are mapped, and the processors are matched with an isolation 485 communication chip and externally connected with a data processing platform and a program control load box to carry out message interaction and realize function control;

STM32F1xx series processor, wherein a group of IO ports set up the analog input module to start corresponding ADC function, be used for the voltage value of real-time collection high-power alternating current program control source input, the current value and corresponding power factor, power produced by real load, and with the comparative analysis of current setting parameter, the automatic circuit protection that cuts off of overrange.

As a preferable technical measure of the detection method:

a real load impedance output type electric energy meter detection method,

applied to the real load impedance output type electric energy meter detection system,

which comprises the following steps:

firstly, acquiring an input signal for detection required by a detected electric energy meter;

secondly, calculating an impedance value and an inductive reactance value according to the input signal in the first step;

thirdly, adjusting the output impedance of the program control load box and the output inductive reactance of the program control reactor according to the impedance value and the inductive reactance value in the second step;

fourthly, collecting input signals actually input into the electric energy meter to be detected;

fifthly, analyzing the deviation of current and power factor according to the actual input signal in the fourth step, and calculating the deviation current under the condition that the resistive load is determined;

sixthly, finely adjusting the output inductive reactance of the program control reactor and/or the output impedance of the program control load box according to the deviation current to correct the deviation current;

and seventhly, detecting the real load of the detected electric energy meter according to the corrected current.

Through continuous exploration and test, the required input signal for detection can be accurately generated by adjusting the output impedance of the program-controlled load box and the output inductive reactance of the program-controlled reactor, the scheme is detailed, practical and feasible, and the detection requirement of the intelligent electric energy meter is met.

Meanwhile, the invention can obtain actual and theoretical deviation values according to real-time input signal data, and feed back and adjust the output signals of the programmable reactor and the programmable load box, namely, the output inductive reactance of the programmable reactor and/or the output impedance of the programmable load box are finely adjusted, so that the correction of the deviation current is realized, a detection closed loop is formed, and the accuracy of the output signals is effectively improved.

Furthermore, the invention can realize the intervention and separation of the load program control load, and simultaneously can read the basic data information of voltage, current, power factor and the like in the test environment of the electric energy meter in real time; the load impedance can provide the maximum 100A current output, and the relay performance of the detected electric energy meter can be fully detected.

Furthermore, by using the detection system and method provided by the invention, the real use condition of the electric energy meter can be simulated, the durability test can be performed on the tripping relay in the electric energy meter, the scheme is practical, the application range is wide, and the detection system and method are utilized and popularized.

As a preferable technical measure:

in the second step, the calculation of the impedance value and the inductive reactance value specifically includes the following steps:

when the program control load box is connected with the program control reactor in parallel:

according to the RL parallel model, the current generated by the inductive loop lags the current generated by the resistive loop by 90 degrees,

thus I_RObtained by dividing into I × cos θ

Same principle I_LObtained by multiplying I by sin theta

Wherein U is input voltage of AC program control source, I is total loop current of whole system, I_RR are respectively the current and impedance value of the resistive load loop, I_L、X_LRespectively representing the current and inductive reactance value of the inductive load loop;

according to the current triangle shape, the current of the current triangle,theta is I_RAnd the included angle between the two angles I,

a plurality of representative real load conditions of 0.1-100A, PF 0.25, 0.4, 0.5, 0.8, 1.0 and the like can be combined.

As a preferable technical measure:

in the third step, the impedance value of the program-controlled load box is adjusted, the impedance value is determined by the state of a gear relay inside the program-controlled load box, the corresponding impedance value is obtained by controlling the combination of the gear relays, and then the corresponding current value I can be output_R；

The inductive reactance value of the program control reactor is adjusted by controlling the reactor transmission machine inside the program control reactor, the reactor transmission machine is controlled to start and stop and rotate positively and negatively to obtain a corresponding inductive reactance value, and then the inductive reactance value can be combined with the program control load box to output a required current value I.

As a preferable technical measure:

in the fifth step, the calculation of the offset current specifically includes the following contents:

because the actual program control reactor has internal resistance, the starting and stopping points of the reactor transmission machine also have errors, the deviation of current and power factor is analyzed according to the uploaded real-time data, and under the condition that the resistive load is determined:

calculating Δ I ═ I₀-I；

In the sixth step, the correction of the offset current specifically includes the following contents:

according to

Obtaining the rotation angle of the reactor transmission machine of the program-controlled reactor

Wherein, Delta I is the difference between the theoretical current and the actual current, K is the proportionality constant of the rotating angle of the movable contact of the program control reactor and the inductance variation,for angle of rotation of movable contact and electricityThe transmission angle ratio of the reactor transmission machine is changed;

and the correction of the deviation current is realized by controlling the rotation angle of the reactor transmission machine.

Compared with the prior art, the invention has the following beneficial effects:

through continuous exploration and tests, the programmable reactor and the programmable load box are arranged to be connected in parallel to form an output system, output signals which are independently controlled and used for detecting the electric energy meter can be respectively generated, and measurement signals required by detecting the electric energy meter can be independently and combinatorially output.

Meanwhile, the invention is provided with the information acquisition unit, and can feed back and adjust the output signals of the program-controlled reactor and the program-controlled load box according to the real-time input signal data measured by the information acquisition unit, thereby forming a detection closed loop and effectively improving the accuracy of the output signals.

Drawings

FIG. 1 is a schematic view of the detection system of the present invention;

FIG. 2 is a diagram showing the structure of a reactor control unit according to the present invention;

fig. 3 is a structural diagram of the programmable reactor of the invention.

Description of reference numerals:

1. the MCU main control unit; 2. a reactor control unit; 3. an information acquisition unit; 4. a status indication unit; 5. a program-controlled reactor; 6. and (4) a program-controlled load box.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1-3, an actual load impedance output type electric energy meter detection system includes a data processing platform, an MCU main control unit 1, a reactor control unit 2, an information acquisition unit 3, a state indication unit 4, a program-controlled reactor 5, and a program-controlled load box 6.

The data processing platform is provided with an operation interface and can process the acquired data information.

The MCU main control unit 1 is provided with a processor and is used for realizing message interaction with a data processing platform, so that the MCU main control unit 1 can control subordinate equipment.

The reactor control unit 2 is provided with an up-down control area and an inductive reactance adjusting area, and is used for controlling the up-down power of the program control reactor 5 and changing reactive compensation.

The information acquisition unit 3 is provided with an integrated voltage and current acquisition module for acquiring input signals which are actually input into the electric energy meter to be detected by the programmable reactor 5 and the programmable load box 6.

And the state indicating unit is provided with an indicating lamp for displaying the running states of the programmable reactor and the load box, so that the observing, the controlling and the adjusting are convenient.

The program control reactor 5 is a single-phase program control adjustable reactor, can steplessly and smoothly adjust inductive reactive current, and has excellent stability and linearity.

And the program control load box 6 is used for outputting a preset load and is connected with the program control reactor 5 in parallel or in series.

And the data processing platform converts the received operation instruction into a corresponding control instruction and transmits the control instruction to the MCU control unit.

And the MCU control unit sends commands to the reactor control unit 2 and the program control load box 6 after receiving the control commands.

The reactor control unit 2 controls the program control reactor 5 to cooperate with the program control load box 6 to output a required input signal for detection to the detected electric energy meter.

The information acquisition unit 3 acquires input signals which are actually input into the electric energy meter to be detected by the program control reactor 5 and the program control load box 6, and uploads the acquired input signals to the data processing platform.

The data processing platform compares the theoretical requirement value with the received input signal to obtain an error, and more effectively adjusts the depth of reactive compensation according to the error value to realize accurate detection of the real load impedance parallel output type electric energy meter.

Through continuous exploration and tests, the programmable reactor 5 and the programmable load box 6 are arranged to be connected in parallel to form an output system, output signals which are independently controlled and used for detecting the electric energy meter can be generated respectively, and measurement signals required by detecting the electric energy meter can be output independently or in a combined mode.

Meanwhile, the invention is provided with the information acquisition unit 3, and can feed back and adjust the output signals of the programmable reactor 5 and the programmable load box 6 according to the real-time input signal data measured by the information acquisition unit 3, thereby forming a detection closed loop and effectively improving the accuracy of the output signals.

Furthermore, the invention can realize the intervention and separation of the load program control load, and simultaneously can read the basic data information of voltage, current, power factor and the like in the test environment of the electric energy meter in real time; the load impedance can provide the maximum 100A current output, and the relay performance of the detected electric energy meter can be fully detected.

Furthermore, by using the detection system and method provided by the invention, the real use condition of the electric energy meter can be simulated, the durability test can be performed on the tripping relay in the electric energy meter, the scheme is practical, the application range is wide, and the detection system and method are utilized and popularized.

The method embodiment applied to the real load impedance output type electric energy meter detection system comprises the following steps:

a real load impedance output type electric energy meter detection method,

which comprises the following steps:

firstly, acquiring an input signal for detection required by a detected electric energy meter;

secondly, calculating an impedance value and an inductive reactance value according to the input signal for detection in the first step;

thirdly, adjusting the output impedance of the program control load box and the output inductive reactance of the program control reactor according to the impedance value and the inductive reactance value in the second step;

fourthly, collecting input signals actually input into the electric energy meter to be detected;

fifthly, analyzing the deviation of current and power factor according to the actual input signal in the fourth step, and calculating the deviation current under the condition that the resistive load is determined;

sixthly, finely adjusting the output inductive reactance of the program control reactor and/or the output impedance of the program control load box according to the deviation current to correct the deviation current;

and seventhly, detecting the real load of the detected electric energy meter according to the corrected current.

Through continuous exploration and test, the required input signal for detection can be accurately generated by adjusting the output impedance of the program-controlled load box and the output inductive reactance of the program-controlled reactor, the scheme is detailed, practical and feasible, and the detection requirement of the intelligent electric energy meter is met.

Meanwhile, the invention can obtain actual and theoretical deviation values according to real-time input signal data, and feed back and adjust the output signals of the programmable reactor and the programmable load box, namely, the output inductive reactance of the programmable reactor and/or the output impedance of the programmable load box are finely adjusted, so that the correction of the deviation current is realized, a detection closed loop is formed, and the accuracy of the output signals is effectively improved.

A preferred embodiment of the present invention:

connecting a voltage output end of an alternating-current program control source to an input end of the side face of the detection system; and the detection end of the detected electric energy meter is respectively and electrically connected with the input and output ends of the on-off relay with large current of 100A and the program control load box.

The input terminal of the program control reactor is connected with the input and output ends of a relay K2 with 100A large current.

Namely, an L-end current loop of the detected electric energy meter is connected in series in a voltage output end UH loop of the alternating current program control source, and voltage input ends of the program control load box and the program control reactor are connected in parallel with a voltage output end of the alternating current program control source.

The control part is used for sending commands by a data processing unit (an upper computer) and responding and executing by an embedded single chip microcomputer (a lower computer);

the MCU main control unit comprises an STM32F1xx chip, an isolation 485 communication chip, a program control reactor control logic module, a state indication control logic module, an information acquisition module and the like.

A group of IO ports of the STM32F1xx are provided with output modules to control equipment electrification, program control reactor intervention, inductive reactance regulating motor positive and negative rotation, running state indication and the like.

STM32F1xx a set of IO mouth sets up multiplexing module to map the USART function, the 485 communication chip is kept apart in the cooperation, and external and data processing unit (be PC computer, host computer), programme-controlled load box link to each other, carry out the message and interact, realize function control.

An analog input module is arranged on one group of IO ports of the STM32F1xx, and a corresponding ADC function is started for acquiring a voltage value input by the high-power alternating-current program control source, a current value generated by a real load, a corresponding power factor, power and the like in real time, and comparing and analyzing with a current setting parameter, and loop protection is automatically cut off in an out-of-range mode.

The on-off of the on-off relay realizes the on-off of the equipment, the on-off of the relay K2 realizes the intervention of the programmable reactor, the on-off of the movable relay K3 realizes the on-off of the coil of the forward contactor KM1 or the reverse contactor KM2, and the switching relay K4 realizes the on-off of one of the forward contactor and the reverse contactor.

The normally open contact of the dynamic relay K3 is respectively connected with the middle dynamic contact of the conversion type relay K4 and a three-phase four-wire power supply U loop, the normally open static contact of the conversion type relay K4 is connected with a coil at one side of the forward contactor KM1, and the normally closed static contact is connected with a coil at one side of the reverse contactor KM 2.

Three groups of contacts of the forward contactor KM1 are respectively connected with a U, V, W loop of three-phase four-wire power supply, and three groups of contacts of the reverse contactor KM2 are respectively connected with a W, V, U loop of three-phase four-wire power supply and are connected with a control coil of a reactor transmission in parallel.

According to the RL ideal parallel model, the current generated by the inductive loop lags the current generated by the resistive loop by 90 degrees,

thus I_RObtained by dividing into I × cos θSame principle I_LObtained by multiplying I by sin theta

Wherein U is input voltage of AC program control source, I is total loop current of whole system, I_RR are respectively the current and the impedance of the resistive load loop, I_L、X_LRespectively, the current and the inductive reactance of the inductive load loop.

According to the current triangle shape, the current of the current triangle,theta is I_RThe included angle between the I and the I can be combined to form various representative real load conditions such as 0.1-100A, 0.25 PF, 0.4, 0.5, 0.8, 1.0 and the like.

The actual program-controlled reactor has internal resistance, the starting and stopping points of the reactor transmission machine also have errors, the system analyzes the deviation of current and power factor according to the real-time data uploaded by the information acquisition unit, under the condition that the resistive load is determined,

calculating Δ I ═ I₀-I, according toRotation angle of reactor transmission machine

Wherein, Delta I is the difference between the theoretical current and the actual current, K is the proportionality constant of the rotating angle of the movable contact of the program control reactor and the inductance variation,the deviation is corrected by the rotating angle of the reactor transmission machine under the control of the system, wherein the rotating angle of the movable contact is the variable ratio of the rotating angle of the reactor transmission machine.

The detection system is externally connected with a three-phase power supply to supply power to the control part, and can control the corresponding units of the detection system through a PC platform (data processing platform) and output corresponding current and power factor; the output of the program control load box is determined by the state of an internal gear relay, and the system controls the gear relay combination to output a corresponding current value I_RAnd then adjusting the reactor transmission machine, controlling the start-stop and the forward and reverse rotation of the reactor transmission machine, and combining the reactor transmission machine with the program control load box to output the required current value I.

Meanwhile, the system acquires the current data such as voltage, current, power factor and the like acquired by the data acquisition unit in real time; the function of the relay of the electric energy meter is tested by changing the current values of the programmable reactor and the programmable load box.

For example, the system interface sets the output parameters: U220V, I10A, PF 0.5L, calculated as 44 Ω, X_LFirstly, controlling a program-controlled load box to switch a gear to a 44 omega impedance gear, then controlling a reactor transmission machine to rotate a corresponding angle value of 25.4 omega inductive reactance, and outputting a set parameter with the combined output I of 10A and the PF of 0.5L; the actual output I is 9.886a, PF 0.505766, and Δ X is obtained_L0.39286 Ω, known asK is 0.033333 Ω/degree, and Δ θ ≈ 12 °.

The programmable reactor and the load box are connected in parallel to form an output system, so that the programmable reactor and the load box can be independently or combinatively output, and can be flexibly applied according to actual conditions; each item has an independent program control output signal, and the output signal is manually or automatically adjusted according to the measurement feedback of the signal acquisition unit; in the process of outputting the program-controlled reactor, the system control start and stop may have a certain error on the output current value, in order to ensure the accuracy of output, especially when the current value approximately reaches the current value to be output, the manual control of the system can be utilized to set the time for automatically starting and stopping the motor, the deficient current value is made up, or the deficient current value is complemented by directly rotating a motor hand wheel in a fine adjustment mode, so that the accuracy of the output signal is improved, and the test closure is formed.

Meanwhile, the invention utilizes the real load check mode, can simulate the real use condition of the electric energy meter, and can carry out the durability test aiming at the tripping relay. The system is provided with a data processing platform (PC platform) and an MCU (microprogrammed control Unit), wherein software of the PC platform can remotely control the MCU through serial port communication, so that the intervention and the separation of a real-load program-controlled load are realized, and simultaneously, basic data information such as voltage, current, power factor and the like in a test environment where the electric energy meter is located can be read in real time; the load impedance provides a maximum current output of 100A, and the relay performance of the detected electric energy meter can be fully detected.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely system embodiment, or an embodiment combining system and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.