1. Cubical switchboard partial discharge on-line monitoring system, its characterized in that: the system comprises a monitoring host, an RS485 bus, a wireless data receiving terminal, an LoRa wireless transmission module, a collection node and a discharge monitoring data collection device, wherein the collection node is arranged in a switch cabinet, the discharge monitoring data collection device is arranged in the switch cabinet, the LoRa wireless transmission module is arranged on the discharge monitoring data collection device, the LoRa wireless transmission module is wirelessly connected with the wireless data receiving terminal, the wireless data receiving terminal and the collection node are arranged in a one-to-many connection mode, the discharge monitoring data collection device is electrically connected with the LoRa wireless transmission module, a partial discharge signal in the switch cabinet is coupled, collected and processed by the discharge monitoring data collection device and is sent to the LoRa wireless transmission module, the LoRa wireless transmission module transmits the partial discharge signal to the wireless data receiving terminal in a LoRa wireless communication mode, the RS485 bus is connected with the monitoring host and the wireless data receiving terminal, the wireless data receiving terminal uploads data to the monitoring host by adopting an RS485 communication mode, the monitoring host synchronously acquires and controls the acquisition and sending of all acquisition nodes, controls the receiving and sending of the data, acquires, analyzes, stores and displays the operation state of the system in real time, the discharge monitoring data acquisition device comprises a fixed frame, a lifting screw, a lifting motor, a driving gear, a driven gear, a lifting seat and a sensing monitoring mechanism, the side wall of the fixed frame is provided with a magnet, the fixed frame is arranged in a rectangular frame shape, the lifting screw is rotatably arranged in the fixed frame, the lifting screw is symmetrically arranged at two sides of the fixed frame, the driving gear is rotatably arranged at the upper wall of the fixed frame, the driven gear is coaxially and fixedly connected at the upper end of the lifting screw, the driving gear is meshed with the driven gear, the driven gear is symmetrically arranged at two sides of the driving gear, and the fixed frame is provided with a motor fixing seat, the lifting motor is fixedly connected to the motor fixing seat, an output shaft of the lifting motor is coaxially connected with the driving gear, the lifting seat is slidably arranged on the lifting screw rod and is in threaded connection with the lifting screw rod, and the sensing and monitoring mechanism is arranged on the side wall of the lifting seat.

2. The on-line monitoring system for partial discharge of switch cabinet according to claim 1, characterized in that: sensing monitoring mechanism includes mount pad, set casing, superfrequency sensor and ultrasonic sensor, superfrequency sensor locates in the set casing, the both sides of set casing are located to the mount pad symmetry, be equipped with magnetism in the mount pad and inhale the piece, sensing monitoring mechanism inhales a magnetism through magnetism and inhales on the piece magnetic adsorption on the lift seat lateral wall, be equipped with the fixed slot on the mount pad, ultrasonic sensor locates in the fixed slot, and the lateral wall of set casing is located to the ultrasonic sensor rigid coupling, loRa wireless transmission module locates on the set casing lateral wall.

3. The on-line monitoring system for partial discharge of switch cabinet according to claim 2, characterized in that: the lateral wall of one side that mount pad and set casing are close to the lift seat is equipped with anti-skidding silica gel board.

4. The on-line monitoring system for partial discharge of switch cabinet according to claim 2, characterized in that: and an ultrasonic probe is arranged on one side of the ultrasonic sensor, which is close to the lifting seat.

5. The on-line monitoring system for partial discharge of switch cabinet according to claim 1, characterized in that: and a display screen is arranged on the monitoring host.

6. The on-line monitoring system for partial discharge of switch cabinet according to claim 2, characterized in that: and a battery is arranged in the fixed shell and is electrically connected with the ultrahigh frequency sensor and the ultrasonic sensor respectively.

Background

The switch cabinet is an important component of an intelligent power grid, is mainly used for a power system to play roles of on-off, control or protection and the like in power generation, power transmission, power distribution, electric energy conversion and consumption, has a voltage level of 3.6-550 kV, and directly influences the safe operation of the power grid due to the stability of the operation of the switch cabinet. The switch cabinet works under the high-voltage environment for a long time, the insulating material can be degraded under the action of an electric field, energy loss exists, the insulation of equipment can be broken down under the action of a strong electric field, and the normal operation of the switch cabinet is seriously influenced due to the fact that local discharge in the switch cabinet damages the insulation of the equipment. The insulation fault is represented by external insulation flashover to the ground, internal insulation flashover to the ground, interphase insulation flashover, lightning overvoltage flashover, porcelain insulator sleeve, capacitor sleeve flashover, pollution flashover, breakdown, explosion, lifting rod flashover, CT flashover, breakdown, explosion, porcelain insulator fracture and the like. Therefore, the switch cabinet is monitored in the partial discharge state, the insulation condition of equipment can be known, a plurality of problems related to manufacturing and installation can be found in time, and the reason and the severity of the insulation fault can be determined.

Disclosure of Invention

In order to solve the existing problems, the invention provides the on-line monitoring system for the partial discharge of the partial discharge detection switch cabinet, which takes ultrahigh frequency and ultrasonic waves as detection indexes and receives ultrahigh frequency electromagnetic waves and ultrasonic waves radiated in the partial discharge process through an antenna sensor and an ultrasonic probe.

The technical scheme adopted by the invention is as follows: the invention discloses a switch cabinet partial discharge online monitoring system, which comprises a monitoring host, an RS485 bus, a wireless data receiving terminal, an LoRa wireless transmission module, an acquisition node and a discharge monitoring data acquisition device, wherein the acquisition node is arranged in a switch cabinet, the discharge monitoring data acquisition device is arranged in the switch cabinet, the LoRa wireless transmission module is arranged on the discharge monitoring data acquisition device, the LoRa wireless transmission module is wirelessly connected with the wireless data receiving terminal, the wireless data receiving terminal and the acquisition node are arranged in a one-to-many connection mode, the discharge monitoring data acquisition device is electrically connected with the LoRa wireless transmission module, the discharge monitoring data acquisition device is coupled, acquires and processes partial discharge signals in the switch cabinet and transmits the partial discharge signals to the LoRa wireless transmission module, and the LoRa wireless transmission module transmits the partial discharge signals to the wireless data receiving terminal in a LoRa wireless communication mode, the RS485 bus is connected with the monitoring host and the wireless data receiving terminal, the wireless data receiving terminal uploads data to the monitoring host in an RS485 communication mode, the monitoring host synchronously acquires and controls all acquisition nodes, receives and transmits the data, acquires, analyzes, stores and displays the data, the monitoring host displays the running state of the system in real time, and the monitoring host gives an alarm when the amplitude or frequency, high-frequency components and the like of the system are abnormal; the system completely restores a historical trend chart, facilitates trend analysis of a user, provides a force guarantee for the operation and maintenance of the user, the discharge monitoring data acquisition device comprises a fixed frame, a lifting screw, a lifting motor, a driving gear, a driven gear, a lifting seat and a sensing monitoring mechanism, wherein the side wall of the fixed frame is provided with a magnet, the fixed frame is arranged in a rectangular frame shape, the fixed frame is adsorbed on a cabinet door of a switch cabinet through the magnet, the lifting screw is rotatably arranged in the fixed frame, the lifting screw is symmetrically arranged on two sides of the fixed frame, the driving gear is rotatably arranged on the upper wall of the fixed frame, the driven gear is coaxially and fixedly connected with the upper end of the lifting screw, the driving gear is meshed with the driven gear, the driven gear is symmetrically arranged on two sides of the driving gear, the fixed frame is provided with a motor fixed seat, the lifting motor is fixedly connected with the motor fixed seat, and the output shaft of the lifting motor is coaxially connected with the driving gear, the lifting seat is arranged on the lifting screw in a sliding mode, the lifting seat is connected with the lifting screw in a threaded mode, the lifting motor works to drive the driving gear to rotate, the driving gear rotates to drive the driven gear to rotate, the driven gear drives the lifting screws on two sides of the fixing frame to rotate synchronously, the lifting screw drives the lifting seat to lift up and down, the sensing monitoring mechanism is arranged on the side wall of the lifting seat, and the lifting seat drives the sensing monitoring mechanism to lift up and down so as to monitor the partial discharge conditions of components with different heights in the switch cabinet.

Further, the sensing monitoring mechanism comprises a mounting seat, a fixed shell, an ultrahigh frequency sensor and an ultrasonic sensor, the ultrahigh frequency sensor is arranged in the fixed shell, the mounting seats are symmetrically arranged on two sides of the fixed shell, a magnetic block is arranged in the mounting seat, the sensing monitoring mechanism is magnetically adsorbed on the side wall of the lifting seat through the magnetic block, the mounting seat is provided with a fixing groove, the ultrasonic sensor is arranged in the fixing groove and fixedly connected with the side wall of the fixing shell, the LoRa wireless transmission module is arranged on the side wall of the fixing shell, when partial discharge occurs in the high-voltage switch cabinet, a current pulse with the gradient of nanosecond level is generated to excite an electromagnetic wave signal with a wider frequency band, an antenna of the fixed shell is used for coupling the UHF signal, the frequency of the detected signal is high, the signal is less interfered by the outside, and the sensitivity and the reliability of the partial discharge detection of the electrical equipment are greatly improved; when partial discharge occurs, violent impact is generated among molecules in a discharge area, sound waves are generated macroscopically, the frequency of the sound waves is greater than 20kHz and is called as ultrasonic waves, the ultrasonic detection is performed through an ultrasonic sensor, the partial discharge of the switch cabinet can be monitored, the switch cabinet is free from electrical interference, and the accurate positioning of a discharge source can be realized.

Furthermore, the side wall of one side of the mounting seat and the fixed shell, which is close to the lifting seat, is provided with an anti-slip silica gel plate.

Furthermore, one side of the ultrasonic sensor, which is close to the lifting seat, is provided with an ultrasonic probe, so that ultrasonic waves in the switch cabinet can be monitored conveniently.

Furthermore, a display screen is arranged on the monitoring host machine, and the display screen is convenient for displaying the running state of the system.

Further, be equipped with the battery in the set casing, the battery respectively with superfrequency sensor, ultrasonic sensor electric connection, superfrequency sensor, ultrasonic sensor adopt the battery power supply, have simplified the on-the-spot and have got the electricity, the wiring problem, have easy to assemble, be convenient for construction, debugging and later maintenance.

The invention with the structure has the following beneficial effects: this scheme cubical switchboard partial discharge on-line monitoring system uses the superfrequency, the ultrasonic wave is the detection index, receive the superfrequency electromagnetic wave and the ultrasonic wave of partial discharge in-process radiation through antenna sensor and ultrasonic transducer, thereby realize the partial discharge and detect, the mode of inhaling through the magnetism is convenient for install the discharge monitoring data collection system of collection node in the cubical switchboard fast, be convenient for monitor collection node cubical switchboard, battery powered has simplified the on-the-spot electricity of getting, the wiring problem, easy to assemble has, be convenient for construct, debugging and later maintenance.

Drawings

FIG. 1 is a schematic structural diagram of a partial discharge on-line monitoring system of a switch cabinet according to the present invention;

FIG. 2 is a schematic structural diagram of a discharge monitoring data acquisition device of the switch cabinet partial discharge on-line monitoring system of the present invention;

FIG. 3 is a rear view of a discharge monitoring data acquisition device of the switch cabinet partial discharge on-line monitoring system of the present invention;

FIG. 4 is a schematic structural view of a sensing monitoring mechanism of the on-line monitoring system for partial discharge of the switch cabinet of the invention;

FIG. 5 is a bottom view of a sensing monitoring mechanism of the on-line monitoring system for partial discharge of the switch cabinet of the present invention;

fig. 6 is a perspective view of a sensing monitoring mechanism of the switch cabinet partial discharge online monitoring system.

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings: 1. monitoring host computer, 2, RS485 bus, 3, wireless data receiving terminal, 4, loRa wireless transmission module, 5, acquisition node, 6, discharge monitoring data acquisition device, 7, mount, 8, lifting screw, 9, elevator motor, 10, driving gear, 11, driven gear, 12, lift seat, 13, sensing monitoring mechanism, 14, magnet, 15, mount pad, 16, set casing, 17, superfrequency sensor, 18, ultrasonic sensor, 19, fixed slot, 20, anti-skidding silica gel board, 21, ultrasonic transducer, 22, battery.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-6, the switch cabinet partial discharge online monitoring system of the invention includes a monitoring host 1, an RS485 bus 2, a wireless data receiving terminal 3, a LoRa wireless transmission module 4, a collection node 5 and a discharge monitoring data collection device 6, wherein the collection node 5 is disposed in the switch cabinet, the discharge monitoring data collection device 6 is disposed in the switch cabinet, the LoRa wireless transmission module 4 is disposed on the discharge monitoring data collection device 6, the LoRa wireless transmission module 4 is wirelessly connected with the wireless data receiving terminal 3, the wireless data receiving terminal 3 and the collection node 5 are disposed in a one-to-many connection manner, the discharge monitoring data collection device 6 is electrically connected with the LoRa wireless transmission module 4, the discharge monitoring data collection device 6 is coupled, collects and processes a partial discharge signal inside the switch cabinet and sends the partial discharge signal to the LoRa wireless transmission module 4, and the LoRa wireless transmission module 4 sends the processed partial discharge signal in a LoRa wireless communication manner to the partial discharge signal The discharge monitoring data acquisition device 6 comprises a fixed frame 7, a lifting screw 8, a lifting motor 9, a driving gear 10, a driven gear 11, a lifting seat 12 and a sensing monitoring mechanism 13, wherein the side wall of the fixed frame 7 is provided with a magnet 14, the fixed frame 7 is arranged in a rectangular frame, the lifting screw 8 is rotatably arranged in the fixed frame 7, the both sides of mount 7 are located to lifting screw 8 symmetry, the driving gear 10 rotates and locates the mount 7 upper wall, and lifting screw 8's upper end is located to the coaxial rigid coupling of driven gear 11, driving gear 10 and driven gear 11 meshing, and driven gear 11 symmetry is located the driving gear 10 both sides, be equipped with the motor fixing base on the mount 7, lifting motor 9 rigid coupling is located on the motor fixing base, and lifting motor 9's output shaft and driving gear 10 coaxial coupling, lifting seat 12 slides and locates on lifting screw 8, lifting seat 12 and lifting screw 8 threaded connection, sensing monitoring mechanism 13 locates on lifting seat 12 lateral walls.

Wherein, sensing monitoring mechanism 13 includes mount pad 15, set casing 16, superfrequency sensor 17 and ultrasonic sensor 18, superfrequency sensor 17 is located in set casing 16, the both sides of set casing 16 are located to mount pad 15 symmetry, be equipped with magnetism in the mount pad 15 and inhale the piece, sensing monitoring mechanism 13 inhales a magnetism through magnetism and inhales on lift seat 12 lateral wall, be equipped with fixed slot 19 on the mount pad 15, ultrasonic sensor 18 locates in the fixed slot 19, the lateral wall of set casing 16 is located to ultrasonic sensor 18 rigid coupling, loRa wireless transmission module 4 locates on the set casing 16 lateral wall.

The side walls of the mounting seat 15 and the fixed shell 16 close to one side of the lifting seat 12 are provided with anti-skid silica gel plates 20; an ultrasonic probe 21 is arranged on one side of the ultrasonic sensor 18 close to the lifting seat 12; a display screen is arranged on the monitoring host 1; a battery 22 is arranged in the fixed shell 16, and the battery 22 is electrically connected with the ultrahigh frequency sensor 17 and the ultrasonic sensor 18 respectively.

When the device is used, a fixing frame 7 is adsorbed on the side wall of a switch cabinet through a magnet 14, then a sensing monitoring mechanism 13 is magnetically adsorbed on the side wall of a lifting seat 12 through a magnetic adsorption block, a lifting motor 9 works to drive a driving gear 10 to rotate, the driving gear 10 rotates to drive a driven gear 11 to rotate, the driven gear 11 drives lifting screw rods 8 on two sides of the fixing frame 7 to synchronously rotate, the lifting screw rods 8 drive the lifting seat 12 to lift up and down, the lifting seat 12 drives the sensing monitoring mechanism 13 to lift up and down so as to monitor the partial discharge conditions of components with different heights in the switch cabinet, the sensing monitoring mechanism 13 couples, collects and processes discharge signals in the switch cabinet of different collection nodes 5 and transmits the processed partial discharge signals to a wireless data receiving terminal 3 through a LoRa wireless transmission module 4, and the wireless data receiving terminal 3 uploads data to a monitoring host 1 in an RS485 communication mode, the monitoring host 1 performs synchronous acquisition control and data receiving and sending control on all the acquisition nodes 5, acquires, analyzes, stores and displays data, the monitoring host 1 displays the running state of the system in real time, and when the amplitude or frequency, high-frequency components and the like of the system are abnormal, the monitoring host 1 gives an alarm; the system completely restores the historical trend chart, facilitates trend analysis of the user and provides powerful guarantee for operation and maintenance of the user.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.