1. The utility model provides a cable temperature measuring device in pit which characterized in that: the device comprises a wireless temperature receiver

The device comprises a transmitter module and at least one passive wireless temperature measurement module;

the passive wireless temperature measurement module is arranged at the underground cable body and the middle joint and is used for monitoring the temperature change conditions of the underground cable and the middle joint in real time;

the wireless temperature transceiver module is arranged on a well wall below the well head or under the well head and used for receiving and sending temperature information monitored by the passive wireless temperature measurement module.

2. The downhole wireline temperature measurement device of claim 1, wherein: the wireless temperature transceiver module comprises an MCU controller, an NB-IOT receiving module, an NB-IOT transmitting module and a power management module;

the power management module is used for respectively providing power for the NB-IOT receiving module, the NB-IOT transmitting module and the MCU processor;

the input end of the MCU processor is connected with the NB-IOT receiving module, and the output end of the MCU processor is connected with the NB-IOT transmitting module;

the NB-IOT receiving module is used for receiving temperature information;

the NB-IOT transmitting module comprises an SIM card and is used for sending temperature information and communicating with the outside.

3. The downhole wireline temperature measurement device of claim 1, wherein: the passive wireless temperature measurement module comprises a power-taking alloy sheet module, a temperature probe module, a passive wireless temperature sensor main body module and a binding belt;

the power taking alloy sheet module is used for induction power taking;

the temperature probe module is used for detecting temperature;

the passive wireless temperature sensor main body module comprises an NB-IOT wireless transmitting module and can transmit monitored temperature information, and the passive wireless temperature sensor main body module is communicated with the NB-IOT receiving module through the NB-IOT wireless transmitting module;

the ribbon is used for fixing the passive wireless temperature sensor main body module and fixing the temperature probe module at a temperature measuring position.

4. The downhole wireline temperature measurement device of any of claims 1-3, wherein: waterproof shells are arranged outside the passive wireless temperature measuring module and the wireless temperature transceiver module, and the protection grade of the waterproof shells is IP 68; the waterproof shell is provided with a through hole for passing through the module wire, and the through hole is sealed after the wire passes through the through hole.

5. The downhole wireline temperature measurement device of claim 4, wherein: and a sensor probe of the temperature probe module is arranged close to a connecting point of a contact or a copper bar of the circuit breaker and is fixed by a high-temperature adhesive tape and a binding belt.

6. The downhole wireline temperature measurement device of claim 5, wherein: the electricity-taking soft magnetic alloy sheet winds around the single-phase cable of the single-core cable or the three-core cable for 2-4 circles, the head of the alloy sheet is finally inserted into the through hole of the passive wireless temperature sensor main body module, and the alloy sheet is wound by a high-temperature adhesive tape or a heat-shrinkable tube.

7. A downhole cable temperature monitoring system, comprising: the monitoring system is based on the Internet of things framework design and is divided into three basic structures, namely a sensing layer, a network layer and an application layer;

the sensing layer comprises a downhole cable temperature measuring device; the downhole cable temperature measuring device is the downhole cable temperature measuring device of any one of claims 1-6;

the network layer is a physical communication link for communicating the wireless temperature transceiver module with a system monitoring center;

the application layer is a monitoring center and is used for receiving collected data and monitoring data in real time.

8. A downhole wireline monitoring system according to claim 7, wherein: the monitoring center is connected with a cloud server, and the cloud server can be used for displaying monitoring data, evaluating the running state, analyzing and diagnosing data, warning and designing parameters in real time.

9. A downhole wireline condition monitoring system as defined in claim 8, wherein: the monitoring center also comprises an alarm module used for sending alarm information in time when the single-phase temperature exceeds the standard or the phase temperature difference threshold.

10. A method of monitoring a downhole wireline monitoring system according to any of claims 7-9, characterized by: the monitoring method comprises the following steps:

the passive wireless temperature measurement module transmits the acquired temperature information to the monitoring center through the wireless temperature transceiver module;

the monitoring center analyzes the collected temperature information in real time through the cloud server, displays monitoring data, evaluates the running state, analyzes and diagnoses the data, warns early warning and designs parameters in real time through the cloud server, and realizes real-time monitoring of the temperature of the cable and the intermediate joint in the well;

when the monitored temperature value exceeds the standard, the monitoring center sends an alarm and sends the alarm information to related personnel; and the exceeding of the temperature value is set as the exceeding of the single-phase temperature or the threshold value of the phase temperature difference.

Background

With the continuous development of society, high-voltage cables are more and more widely applied due to the advantages of being beneficial to city beauty, small in occupied area, high in power supply reliability and the like. However, in the long-term operation of the power cable, heat generation occurs due to external or self factors, and the heat generation phenomenon is most obvious in a dense cable laying area and near a cable middle joint (due to poor heat dissipation, poor crimping process, water inflow of the joint and the like). The excessive temperature can influence the insulating property of the insulating material of the power cable, cause insulation aging, shorten the service life of the cable, and lead to fire and power failure accidents under severe conditions. The traditional power cable temperature measurement mode mainly comprises two modes of manual temperature measurement and distributed optical fiber temperature measurement. The manual temperature measurement needs personnel to enter the cable well for operation, so that potential safety hazards such as fire, explosion, electric shock and the like exist, and the operation efficiency is low. The distributed optical fiber temperature measurement is based on the optical time domain reaction principle, can better collect the temperature of a cable body and an intermediate joint, but is high in cost and only used in cable tunnels and cable box culverts of important substations at present.

Disclosure of Invention

The invention provides a downhole cable temperature measuring device aiming at the problems of the existing power cable temperature measuring mode, which transmits information through a wireless receiving and transmitting device and realizes temperature measurement of a downhole cable and an intermediate joint. In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the invention provides a downhole cable temperature measuring device, which comprises: wireless temperature receiver

The device comprises a transmitter module and at least one passive wireless temperature measurement module; the passive wireless temperature measurement module is arranged at the underground cable body and the middle joint and is used for monitoring the temperature change conditions of the underground cable and the middle joint in real time; the wireless temperature transceiver module is arranged on a well wall below the well head or under the well head and used for receiving and sending temperature information monitored by the passive wireless temperature measurement module.

Preferably, the wireless temperature transceiver module comprises an MCU controller, an NB-IOT receiving module, an NB-IOT transmitting module and a power management module; the power management module is used for respectively providing power for the NB-IOT receiving module, the NB-IOT transmitting module and the MCU processor; the input end of the MCU processor is connected with the NB-IOT receiving module, and the output end of the MCU processor is connected with the NB-IOT transmitting module; the NB-IOT receiving module is used for receiving temperature information; the NB-IOT transmitting module comprises an SIM card and is used for sending temperature information and communicating with the outside.

Preferably, the passive wireless temperature measurement module comprises a power-taking alloy sheet module, a temperature probe module, a passive wireless temperature sensor main body module and a binding belt; the power taking alloy sheet module is used for induction power taking; the temperature probe module is used for detecting temperature; the passive wireless temperature sensor main body module comprises an NB-IOT wireless transmitting module and can transmit monitored temperature information, and the passive wireless temperature sensor main body module is communicated with the NB-IOT receiving module through the NB-IOT wireless transmitting module; the ribbon is used for fixing the passive wireless temperature sensor main body module and fixing the temperature probe module at a temperature measuring position.

Preferably, waterproof shells are arranged outside the passive wireless temperature measurement module and the wireless temperature transceiver module, and the protection grade of the waterproof shells is IP 68; the waterproof shell is provided with a through hole for passing through the module wire, and the through hole is sealed after the wire passes through the through hole.

Preferably, the sensor probe of the temperature probe module is mounted close to a connecting point of a contact or a copper bar of the circuit breaker and is fixed by a high-temperature adhesive tape and a binding belt.

Preferably, the electricity-taking soft magnetic alloy sheet winds around the single-phase cable of the single-core cable or the three-core cable for 2-4 circles, and the head of the alloy sheet is finally inserted into the through hole of the passive wireless temperature sensor main body module and wound by a high-temperature adhesive tape or a heat-shrinkable tube.

The invention also provides an underground cable monitoring system which is based on the Internet of things framework design and is divided into three basic structures, namely a sensing layer, a network layer and an application layer; the sensing layer comprises a downhole cable temperature measuring device; the underground cable temperature measuring device is characterized in that the underground cable temperature measuring device is arranged in the underground cable; the network layer is a physical communication link for communicating the wireless temperature transceiver module with a system monitoring center; the application layer is a monitoring center and is used for receiving collected data and monitoring data in real time.

Preferably, the monitoring center is connected with a cloud server, and the cloud server can be used for displaying monitoring data, evaluating the running state, analyzing and diagnosing data, warning and designing parameters in real time.

Preferably, the monitoring center further comprises an alarm module, and the alarm module is used for sending alarm information in time when the single-phase temperature exceeds the standard or the phase temperature difference threshold.

The invention is based on the underground cable monitoring system, and also provides a monitoring method of the underground cable monitoring system, which comprises the following steps:

the passive wireless temperature measurement module transmits the acquired temperature information to the monitoring center through the wireless temperature transceiver module; the monitoring center analyzes the collected temperature information in real time through the cloud server, displays monitoring data, evaluates the running state, analyzes and diagnoses the data, warns early warning and designs parameters in real time through the cloud server, and realizes real-time monitoring of the temperature of the cable and the intermediate joint in the well; when the monitored temperature value exceeds the standard, the monitoring center sends an alarm and sends the alarm information to related personnel; and the exceeding of the temperature value is set as the exceeding of the single-phase temperature or the threshold value of the phase temperature difference.

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

the invention transmits information through the wireless transceiver, and can realize the temperature measurement of the underground cable and the intermediate joint; the underground cable temperature monitoring system and the underground cable temperature monitoring method realize online monitoring of the operation states of the power cable and the intermediate joint in the cable work well, and timely find possible defects or hidden dangers of the underground operation cable and the intermediate joint.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural diagram of a wireless temperature transceiver module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a passive wireless temperature measurement module according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a wireless temperature sensor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an overall architecture of a downhole cable monitoring system according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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 embodiments of the present invention. All other embodiments obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention belong to the protection scope of the present invention.

The invention provides a downhole cable temperature measuring device, which comprises: the wireless temperature monitoring system comprises a wireless temperature transceiver module and at least one passive wireless temperature measuring module.

The passive wireless temperature measurement module is arranged at the underground cable body and the middle joint and is used for monitoring the temperature change conditions of the underground cable and the middle joint in real time; the wireless temperature transceiver module is arranged on a well wall below the well head or under the well head and used for receiving and sending temperature information monitored by the passive wireless temperature measurement module.

The wireless temperature transceiver module comprises an MCU controller 6, an NB-IOT receiving module 8, an NB-IOT transmitting module and a power management module 5; the power management module is respectively connected with the NB-IOT receiving module 8, the NB-IOT transmitting module 7 and the MCU processor 6 and used for supplying power to the NB-IOT receiving module, the NB-IOT transmitting module and the MCU processor; the input end of the MCU processor 6 is connected with the NB-IOT receiving module 8, and the output end of the MCU processor 6 is connected with the NB-IOT transmitting module.

The NB-IOT receiving module is used for receiving temperature information; the NB-IOT transmitting module comprises an SIM card and is used for sending temperature information and communicating with the outside. As shown in fig. 1.

The passive wireless temperature measurement module comprises a power-taking alloy sheet module 1, a passive wireless temperature sensor main body module 2, a temperature probe module 3 and a binding belt 4; the power taking alloy sheet module 1 is used for induction power taking; and the temperature probe module 3 is used for detecting temperature.

The passive wireless temperature sensor main body module comprises an NB-IOT wireless transmitting module and can transmit monitored temperature information, and the passive wireless temperature sensor main body module is communicated with the NB-IOT receiving module through the NB-IOT wireless transmitting module; the ribbon is used for fixing the passive wireless temperature sensor main body module and fixing the temperature probe module at a temperature measuring position. As shown in fig. 2.

Further, the outer portions of the passive wireless temperature measurement module and the wireless temperature transceiver module are respectively provided with a waterproof shell and a protection grade IP68, the waterproof shell is provided with a through hole used for passing through a module wire, and the through hole is sealed after the wire passes through the through hole.

Furthermore, the sensor probe of the temperature probe module is arranged close to the connecting point of the contact or the copper bar of the circuit breaker and is fixed by a high-temperature adhesive tape and a binding belt.

Furthermore, the electricity-taking soft magnetic alloy sheet winds around the single-phase cable of the single-core cable or the three-core cable for 2-4 circles, and the head of the alloy sheet is finally inserted into the through hole of the passive wireless temperature sensor main body module and wound by a high-temperature adhesive tape or a heat-shrinkable tube.

Furthermore, the power management module adopts the lithium cell, the lithium cell sets up in the communication terminal module, communication terminal sets up inside waterproof housing, waterproof housing offers the through-hole that is used for through each monitoring module electric wire, and does sealed processing with the through-hole after the electric wire passes through the through-hole. Lithium batteries can be purchased from existing products.

In order to conveniently carry out centralized supervision on the running states of the underground cable and the intermediate joint provided by the technical scheme and obtain alarm information in time, the invention also provides an underground cable temperature monitoring system which is based on the Internet of things framework design and is divided into three basic structures, namely a sensing layer, a network layer and an application layer.

The sensing layer comprises a downhole cable temperature measuring device; the underground cable temperature measuring device is the underground cable temperature measuring device.

Specifically, a passive wireless temperature measurement module in the cable temperature measurement device can monitor the temperature of the cable body, the intermediate joint and the like, and monitor data are uploaded by using the NB-IOT. The wireless temperature transceiver module can be mounted on a well wall below a well mouth or under the well lid, receives data of the wireless temperature measuring sensor and remotely transmits the data to a background system.

The network layer is a physical communication link for communicating the wireless temperature transceiver module with the system monitoring center.

The application layer is a system monitoring center software platform and is used for receiving collected data and real-time monitoring data.

Furthermore, the monitoring center is connected with a cloud server, and the cloud server can be used for displaying monitoring data, evaluating the running state, analyzing and diagnosing data, warning and designing parameters in real time.

Furthermore, the monitoring center also comprises an alarm module used for sending alarm information in time when the single-phase temperature exceeds the standard or the phase temperature difference threshold.

Specifically, the temperature change conditions of the underground cable and the middle joint are monitored in real time by using the passive wireless temperature measurement module, when the single-phase temperature exceeds the standard or the phase temperature difference threshold value, alarm information is timely and accurately sent out, prevention and control measures are taken in advance, and the cable fault and even the fire accident of a cable dense area is avoided; the invention has wide monitoring range and is suitable for monitoring the state of the cable equipment in the cable work well.

Aiming at the implementation of the underground cable temperature monitoring system, the invention also provides a monitoring method of the underground cable monitoring system, which comprises the following steps:

the passive wireless temperature measurement module transmits the acquired temperature information to the monitoring center through the wireless temperature transceiver module; the monitoring center analyzes the collected temperature information in real time through the cloud server, displays monitoring data, evaluates the running state, analyzes and diagnoses the data, warns early warning and designs parameters in real time through the cloud server, and realizes real-time monitoring of the temperature of the cable and the intermediate joint in the well;

when the monitored temperature value exceeds the standard, the monitoring center sends an alarm and sends the alarm information to related personnel; and the exceeding of the temperature value is set as the exceeding of the single-phase temperature or the threshold value of the phase temperature difference.

The monitoring center stores parameter information of the cable work well and equipment in the well; the cable working well parameter information comprises a working well geographical position and a serial number; the monitoring center is connected with a cloud server which can be used for displaying monitoring data, operation state evaluation, data analysis diagnosis, early warning and alarming and parameter design in real time, displaying the operation state of the underground cable in real time and realizing real-time monitoring of the temperature of the underground cable and the intermediate joint; when the detected numerical value exceeds the standard, the monitoring center gives an alarm in time and sends the alarm information to related personnel.

In conclusion, the temperature measurement of the underground cable and the middle joint can be realized by transmitting information through the wireless transceiver; the underground cable temperature monitoring system and the underground cable temperature monitoring method realize online monitoring of the operation states of the power cable and the intermediate joint in the cable work well, and timely find possible defects or hidden dangers of the underground operation cable and the intermediate joint.

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.