Switch cabinet partial discharge monitoring system

Abstract

The utility model provides a partial discharge monitoring system for a switch cabinet, which belongs to the technical field of electronic circuits and comprises a master control module, a mobile communication module, a power supply module, a temperature and humidity detection module, an ultrasonic detection module and an ultraviolet detection module. The power supply module is respectively connected with the main control module, the mobile communication module, the temperature and humidity detection module, the ultrasonic detection module and the ultraviolet detection module for power supply, and the temperature and humidity detection module, the ultrasonic detection module and the ultraviolet detection module are all connected with the main control module; the ultraviolet module is used for capturing ultraviolet rays generated by partial discharge. The ultraviolet detection module is used for detecting ultraviolet rays generated by partial discharge, the ultrasonic detection module is combined to collect partial discharge analog quantity data to accurately and reliably detect the partial discharge phenomenon, meanwhile, the mobile communication module sends the data monitored and collected by the device to a cloud server, and remote monitoring and remote upgrading are achieved. And the later maintenance cost and time are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, relates to a switch cabinet partial discharge monitoring system. BACKGROUND

[0002] The switch cabinet is as the important device of distribution, and its safe and stable work is the premise of the power grid safe power supply, and the switch cabinet is influenced by the interference factor in each link of manufacture, transportation, installation and operation, leads to the internal insulation of switch cabinet to be poor and produces the creeping, flashover failure, namely the partial discharge phenomenon, once the insulating medium is punctured, will cause the inestimable influence, and the purpose that the partial discharge detection equipment is put into application is to detect the partial discharge and prompt the staff to overhaul in time, thereby avoiding the potential economic and social risk.

[0003] The existing partial discharge detection equipment is divided into fixed point type and handheld type, and the fixed point type equipment is high in precision, high in cost and large in size, and the handheld type equipment is low in precision and convenient to carry, the existing partial discharge detection equipment needs the staff to carry the equipment into the switch cabinet, detects each point, and whether the partial discharge occurs can be determined through the detection data.

[0004] The partial discharge signal is discontinuous and susceptible to interference, needs long time continuous monitoring, therefore the temporary detection can only determine whether the partial discharge occurs in the current time range, and the long time data cannot be used to quantitatively distinguish the partial discharge intensity. UTILITY MODEL CONTENT

[0005] The utility model discloses a switch cabinet partial discharge monitoring system, solves the technical problem that the existing partial discharge detection equipment cannot be detected in real time, needs to go to the fixed point detection, and the long time continuous monitoring cannot be used to judge the partial discharge intensity and the overhaul importance degree.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme as follows:

[0007] A switch cabinet partial discharge monitoring system, including main control module, mobile communication module, power module, temperature and humidity detection module, ultrasonic detection module and ultraviolet detection module, power module is connected with main control module, mobile communication module, temperature and humidity detection module, ultrasonic detection module and ultraviolet detection module respectively and powers, temperature and humidity detection module, ultrasonic detection module and ultraviolet detection module all are connected with main control module, mobile communication module is connected with main control module, and ultrasonic detection module is used for gathering partial discharge ultrasonic analog quantity, and ultraviolet module is used for capturing the ultraviolet that partial discharge produces.

[0008] Further, the above-mentioned scheme further includes cloud server, and main control module is connected with cloud server through mobile communication module, or main control module is connected with the mobile phone of external user through mobile communication module.

[0009] Further, the above-mentioned scheme further comprises an acousto-optic module connected with the main control module, and the main control module comprises a buzzer and an LED indicator light, both of which are connected with the main control module.

[0010] Further, the ultrasonic detection module comprises an ultrasonic sensor and a biasing amplification circuit, the ultrasonic sensor is connected with the biasing amplification circuit, and the biasing amplification circuit is connected with the main control module.

[0011] Further, the ultraviolet module comprises an ultraviolet sensor and an ultraviolet driver, the ultraviolet sensor is connected with the ultraviolet driver, and the ultraviolet driver is connected with the main control module.

[0012] The utility model discloses a following beneficial effect has because of adopting above -mentioned technical scheme:

[0013] (1) the utility model discloses a ultraviolet detection module detects the ultraviolet of partial discharge, and the ultrasonic detection module gathers partial discharge analog quantity data and realizes accurate, reliable detection partial discharge phenomenon, and mobile communication module sends the data that device monitoring gathers to cloud server, realizes remote monitoring and remote upgrade, reduces the later maintenance cost and time.

[0014] (2) remote real -time monitoring, improve detection efficiency, save manpower and time cost, through adopting mobile communication mode, the partial discharge data and environmental information that equipment gathers are uploaded to cloud server in real time, provide data support for staff overhaul, reduce manpower resource investment to point inspection.

[0015] (3) combined ultraviolet sensor and ultrasonic sensor superimposed detection, eliminate the limitation and error of single detection mode, improve the precision and reliability of partial discharge detection, help to avoid the occurrence of power equipment failure and accident.

[0016] (4) continuous point monitoring, break through the time limitation of temporary inspection, can according to historical partial discharge information mark and carry out order of magnitude quantization distinction to partial discharge signal intensity, thereby to each point overhaul priority judgment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the system structure diagram of the utility model;

[0018] Figure 2 It is the system circuit principle module diagram of the utility model;

[0019] Figure 3 It is the ultrasonic wave biasing circuit principle diagram of the utility model;

[0020] Figure 4 It is the ultrasonic wave amplification circuit principle diagram of the utility model;

[0021] Figure 5 is the circuit principle diagram of the power module of the utility model;

[0022] Figure 6 is the circuit principle diagram of the power module of the utility model;

[0023] Figure 7 is the circuit principle diagram of the main control module of the utility model;

[0024] Figure 8 is the circuit principle diagram of the mobile communication module of the utility model;

[0025] Figure 9 is the temperature detection module of the utility model;

[0026] Figure 10 is the circuit principle diagram of the sound and light module of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following preferred embodiments are referred to the drawings and are given, and the utility model is further explained in detail. However, it should be pointed out that many details listed in the specification are only for making the reader have a thorough understanding of one or more aspects of the utility model, and the aspects of the utility model can be realized even without these specific details.

[0028] As shown in Figures 1-2 A switch cabinet partial discharge monitoring system, comprising a main control module, a mobile communication module, a power module, a temperature and humidity detection module, a cloud server, a sound and light module, an ultrasonic detection module and an ultraviolet detection module, the power module is connected with the main control module, the mobile communication module, the temperature and humidity detection module, the ultrasonic detection module and the ultraviolet detection module for power supply, the temperature and humidity detection module, the ultrasonic detection module and the ultraviolet detection module are connected with the main control module, the mobile communication module is connected with the main control module, the ultrasonic detection module is used for collecting partial discharge ultrasonic analog quantity, and the ultraviolet module is used for capturing ultraviolet generated by partial discharge.

[0029] The main control module is connected with the cloud server through the mobile communication module, or the main control module is connected with the mobile phone of the external user through the mobile communication module. The sound and light module is connected with the main control module, and the main control module comprises a buzzer and an LED indicator light, and the buzzer and the LED indicator light are connected with the main control module.

[0030] The main control module is an stm32f407vet6 minimum system, which is used for central processing and coordination of the work of each module. The ultrasonic module is used for collecting partial discharge ultrasonic analog quantity. The ultraviolet module is used for capturing ultraviolet generated by partial discharge. The temperature and humidity detection module is used for collecting environmental information. The mobile communication module is used for connecting the cloud server to upload partial discharge data and environmental information. The power module is used for power supply of each module.

[0031] The main control module and the mobile communication module communicate bidirectionally via a UART serial port. The mobile communication module is equipped with a transceiver antenna. The ultrasonic detection module, including an ultrasonic sensor and a bias amplifier, is connected to the main control module. The ultraviolet detection module, including an ultraviolet sensor and an ultraviolet driver, is also connected to the main control module. The audible and visual module, including a buzzer and an LED, is independently connected to the main control module. The power supply module provides 3.3V, 5V, and 24V power to each module.

[0032] The main control module and the mobile communication module are connected via a UART serial port. The mobile communication module uses the MQTT protocol to establish a connection with the cloud server, uploading partial discharge data and environmental information to the cloud server to achieve remote real-time monitoring and reduce manpower input.

[0033] The device captures the partial discharge signal through the ultraviolet pulse generated by the driver via the ultraviolet detection module, and combines it with the ultrasonic detection module to collect analog data of the partial discharge signal for superimposed monitoring. This allows for accurate and reliable detection of the partial discharge signal. The device marks the current partial discharge signal and determines the intensity of the partial discharge based on the historical intervals between partial discharge signals, the ultraviolet pulse, and the analog ultrasonic data.

[0034] In this embodiment of the utility model, such as Figures 3-4 As shown, the ultrasonic detection module includes an ultrasonic sensor and a bias amplifier circuit. The ultrasonic sensor is connected to the bias amplifier circuit, which is connected to the main control module. The bias amplifier circuit includes a bias circuit and an amplifier circuit, and the bias circuit is connected to the main control module via the amplifier circuit.

[0035] like Figure 4 As shown, in the bias circuit, connector CN1 is connected to the ultrasonic sensor. The integrated operational amplifier U8, along with resistors R59 and R60 and capacitor C36, forms a voltage follower. The integrated operational amplifier U8, along with capacitor C35, resistors R58, R58, and R57, forms a signal boosting circuit. Pin 1 of the integrated operational amplifier U8 is connected to a 5V input, and pin 4 is connected to GND. The boosted voltage is configured using resistors R59 and R60 and capacitor C36. The voltage follower enhances the output capability. The ultrasonic acquisition voltage result boosting circuit outputs to pin 1 of connector CN2.

[0036] like Figure 5 As shown, in the amplifier circuit, the instrumentation amplifier U11 and resistors R64, R61, R62, and R63 form a differential amplifier circuit, with the reference voltage provided by the voltage reference chip U13; the integrated operational amplifier U12 and resistors R67, R66, and R65 form an amplifier circuit; the ultrasonic bias module outputs to pin 2 of connector J1, and the ultrasonic amplification module amplifies the biased ultrasonic voltage in multiple stages, which is detected by pin 27 of the main control module.

[0037] In the embodiment of the utility model, Figure 5 As shown in the figure, the ultraviolet module includes an ultraviolet sensor and an ultraviolet driver, the ultraviolet sensor is connected with the ultraviolet driver, and the ultraviolet driver is connected with the main control module. The ultraviolet detection module is composed of a photoelectric transducer U9 and a driving circuit U10. The ultraviolet phenomenon of partial discharge is detected by the photoelectric transducer U9. The third pin of the photoelectric transducer U9 generates a signal output, is connected to the first pin of the driving circuit U10, and generates a pulse signal at the fourth pin and the fifth pin after being processed by the driving circuit U10. The main control module collects the pulse signal to determine the ultraviolet phenomenon. The access resistance R19 and the resistance R20 improve the circuit stability and prevent the signal line from being suspended.

[0038] As shown in the figure, Figure 6 The power module inputs +24VDC, a D1 diode is connected in series to prevent backflow, an F1 fuse is connected in series to serve as system current limiting protection, then C7, C5, C24, C25 and C26 capacitors are connected in parallel for filtering, and a D7 transient voltage suppression diode is connected in parallel to prevent surge voltage. U3 voltage stabilizing IC reduces 24V to 5V to supply each module, and 5V is reduced to 3.3V by U4 low dropout linear voltage stabilizing IC.

[0039] As shown in the figure, Figure 7 The main control module adopts an stm32f407vet6 microcontroller. The 32nd pin controls the conduction of a triode and further controls the working of a buzzer. The 3rd pin and the 4th pin control the on-off of an LED lamp. The 33rd pin and the 29th pin are connected with a mobile communication module and are used for main control communication. The 59th pin is connected with a temperature and humidity detection module and is used for collecting environmental information. The 55th pin and the 56th pin are connected with an ultraviolet detection module and are used for collecting ultraviolet pulses. The 27th pin is connected with an ultrasonic detection module and is used for collecting ultrasonic voltage. The 6th pin is connected in parallel with a button K1 and a capacitor C1, and the 10th pin is connected in parallel with a button K2 and a capacitor C3. The levels of the 6th pin and the 10th pin are detected to determine whether the buttons are pressed. The 49th pin is connected with a resistance R15 and is then connected with the 7th pin of a USB-to-serial chip U5. The 48th pin is connected with a resistance R18 and is then connected with the 6th pin of the USB-to-serial chip U5. The 1st pin of the USB-to-serial chip U5 is connected with a resistance R14 and is then connected with the A6 pin and the B6 pin of a USB interface. The 2nd pin of the USB-to-serial chip U5 is connected with a resistance R16 and is then connected with the A7 pin and the B7 pin of the USB interface. The USB differential signal is converted into a level signal recognizable by a single-chip microcomputer.

[0040] As shown in the figure, Figure 8As shown, the U7 pin 7 of the mobile communication module is connected with GND, the pin 8 is connected with 5V input, the pin 3 is connected with the pin 29 of the master control, the pin 4 is connected with the pin 33 of the master control, the U7 mobile communication module and the master control realize data uploading through serial communication.

[0041] As shown in the figure, Figure 9 As shown, the U6 pin 1 of the temperature and humidity detection module is connected with 5V input, the module pin 3 is connected with GND, the module pin 2 is connected with the pin 59 of the master control, and the temperature and humidity information collection is realized through the single bus communication protocol and the master control. The resistance R23 and the resistance R24 are connected to improve the circuit stability and prevent the signal line from being suspended.

[0042] As shown in the figure, Figure 10 As shown in the figure,

[0043] The ultraviolet detection module detects the ultraviolet generated by the partial discharge, the ultrasonic detection module collects the analog data of the partial discharge to realize accurate and reliable detection of the partial discharge phenomenon, the mobile communication module sends the data collected by the device to the cloud server to realize remote monitoring and remote upgrading, and the maintenance cost and time are reduced.

[0044] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the technical field, without departing from the principle of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A switchgear partial discharge monitoring system characterized by: It includes a main control module, a mobile communication module, a power supply module, a temperature and humidity detection module, an ultrasonic detection module, and an ultraviolet detection module. The power supply module is connected to and supplies power to the main control module, the mobile communication module, the temperature and humidity detection module, the ultrasonic detection module, and the ultraviolet detection module. The temperature and humidity detection module, the ultrasonic detection module, and the ultraviolet detection module are all connected to the main control module. The mobile communication module is connected to the main control module. The ultrasonic detection module is used to collect analog ultrasonic signals from partial discharge, and the ultraviolet module is used to capture ultraviolet rays generated by partial discharge.

2. The partial discharge monitoring system of the switchgear according to claim 1, characterized in that: It also includes cloud servers, with the main control module connected to the cloud server via a mobile communication module, or the main control module connected to an external user's mobile phone via a mobile communication module.

3. The partial discharge monitoring system of claim 1, wherein: It also includes an audio-visual module, which is connected to the main control module. The main control module includes a buzzer and LED indicator lights, both of which are connected to the main control module.

4. The partial discharge monitoring system of claim 1, wherein: The ultrasonic testing module includes an ultrasonic sensor and a bias amplifier circuit. The ultrasonic sensor is connected to the bias amplifier circuit, and the bias amplifier circuit is connected to the main control module.

5. The partial discharge monitoring system of claim 1, wherein: The ultraviolet module includes an ultraviolet sensor and an ultraviolet driver. The ultraviolet sensor is connected to the ultraviolet driver, and the ultraviolet driver is connected to the main control module.

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