GIS state comprehensive monitoring device

Abstract

The utility model relates to the field of power transformation equipment state monitoring, in particular to a GIS state comprehensive monitoring device. Comprising an ultrahigh-frequency partial discharge monitoring unit, a circuit breaker mechanical characteristic monitoring unit and an SF6 micro-water density online monitoring unit, the ultrahigh-frequency partial discharge monitoring unit comprises an ultrahigh-frequency partial discharge sensor, a filtering and amplifying circuit, an AD conversion circuit, an FPGA chip and a main control chip which are connected in sequence, and parallel acquisition and edge calculation of partial discharge signals are achieved; the circuit breaker mechanical characteristic monitoring unit comprises an SF6 micro-water density sensor, a 485 communication circuit and a main control chip, and the SF6 micro-water density sensor is connected with the main control chip through the 485 communication circuit; the circuit breaker mechanical characteristic monitoring unit comprises an opening current sensor, a closing current sensor, an energy storage motor current sensor, an angular displacement sensor and an acquisition device. According to the utility model, multi-parameter state synchronous sensing is realized, and the problems of independent monitoring quantity, low data fusion degree and large comprehensive analysis calculation amount in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the field of substation equipment status monitoring, in particular to a GIS status comprehensive monitoring device. Background Art

[0002] With the popularization and application of gas-insulated enclosed switchgear (GIS), higher requirements are put forward for equipment status monitoring. GIS status monitoring includes insulation status, gas status, mechanical status, etc., and fault diagnosis and location analysis are performed through status data to evaluate equipment operation risks and provide operation and maintenance suggestions. The GIS status comprehensive monitoring device has problems such as multiple sensing methods, different monitoring configuration requirements for different voltage levels, and insufficient fusion analysis of multi-source monitoring data. There are also problems such as independent monitoring quantity, low data fusion degree, and large amount of comprehensive analysis calculation. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a GIS status comprehensive monitoring device to achieve synchronous perception of multi-parameter status, solving the problems of independent monitoring quantities, low data fusion and large amount of comprehensive analysis and calculation in the prior art.

[0004] In order to solve the technical problem, the technical solution adopted by the utility model is: a GIS status comprehensive monitoring device, including a UHF partial discharge monitoring unit, a circuit breaker mechanical characteristics monitoring unit and a SF6 micro-water density online monitoring unit, the UHF partial discharge monitoring unit includes a UHF partial discharge sensor and a collection device, the collection device includes a filter amplifier circuit, an AD conversion circuit, an FPGA chip and a main control chip, the UHF partial discharge sensor, the filter amplifier circuit, the AD conversion circuit, and the FPGA chip are connected in sequence to realize the parallel collection of partial discharge signals, the FPGA chip is connected to the main control chip, and the collected partial discharge signals are transmitted to the main control chip; the SF6 micro-water density monitoring unit includes a micro-water density sensor, a 485 communication circuit and a main control chip, and the micro-water density sensor is connected to the main control chip via the 485 communication circuit; the circuit breaker mechanical characteristics monitoring unit includes a switch-off current sensor, a switch-on current sensor, a storage motor current sensor, an angular displacement sensor and a collection device, and the switch-off current sensor, the switch-on current sensor, the storage motor current sensor, and the angular displacement sensor are respectively connected to the collection device.

[0005] Furthermore, the filtering and amplifying circuit includes an amplifier, the UHF partial discharge sensor is connected to the positive input terminal of the amplifier via resistors R65 and R66, the inverting input terminal of the amplifier is connected to the reference voltage via resistor R70, the output terminal of the amplifier is connected to the input terminal of the AD conversion circuit via resistor R69, the AD conversion circuit is implemented based on the AD9226 chip, and the output terminal of the AD conversion circuit is connected to the FPGA chip.

[0006] Furthermore, the UHF partial discharge monitoring unit also includes a phase sensor, and the phase sensor is connected to the filter amplifier circuit, the AD conversion circuit, and the FPGA chip in sequence.

[0007] Furthermore, the UHF partial discharge sensor includes an A-phase UHF partial discharge sensor, a B-phase UHF partial discharge sensor, and a C-phase UHF partial discharge sensor. Each three-phase UHF partial discharge sensor corresponds to a phase sensor. The filtering and amplifying circuit, the AD conversion circuit, and the FPGA chip are integrated on the partial discharge acquisition card. Each partial discharge acquisition card includes 4 channels, namely, A, B, C, and D. That is, each partial discharge acquisition card includes 1 FPGA chip and 4 filtering and amplifying circuits and 4 AD conversion circuits. The 4 filtering and amplifying circuits and the 4 AD conversion circuits are respectively connected to the three-phase UHF partial discharge sensor and the phase sensor. The signals collected by the 4 filtering and amplifying circuits and the 4 AD conversion circuits are transmitted in parallel to the FPGA chip.

[0008] Furthermore, the micro-water density sensor is installed at the SF6 filling port by using a three-way adapter.

[0009] Furthermore, the opening current sensor, closing current sensor, and energy storage motor current sensor all use Hall current sensors. The Hall current sensor is a through-type structure, and the terminal leads of the opening and closing coils pass through the inside of the Hall current sensor.

[0010] Furthermore, the angular displacement sensor is installed at one end of the circuit breaker transmission main shaft, and the circuit breaker transmission main shaft is connected to the moving contact through the operating mechanism, so that the angular displacement sensor obtains the moving contact action data.

[0011] Furthermore, it also includes a comprehensive analysis host computer and a communication module. The ultra-high frequency partial discharge monitoring unit, the circuit breaker mechanical characteristics monitoring unit, and the micro-water density online monitoring are connected to the comprehensive analysis host computer through an optical port or a network port. The comprehensive analysis host computer is connected to the cloud platform, service gateway machine, comprehensive application host, front-end server or station-end system through the communication module.

[0012] Furthermore, the communication module is a router or a switch.

[0013] Beneficial effects of the utility model: The utility model includes an ultra-high frequency partial discharge monitoring unit, a circuit breaker mechanical characteristics monitoring unit and an SF6 micro-water density online monitoring unit, and integrates a multi-parameter sensor to realize the collection of multiple parameters. At the same time, the monitoring unit has an edge computing function and is equipped with a comprehensive analysis host computer, which can realize the synchronous perception, edge analysis and comprehensive analysis of multi-parameter states. The device adopts a modular monitoring unit to respectively realize the real-time monitoring of the GIS insulation state, gas state and mechanical state and the local processing of data edge, quickly adapt to GIS equipment of different voltage levels, realize the synchronous uploading and comprehensive analysis of multi-source monitoring data, and use a unified communication model to upload it to the comprehensive monitoring system to realize data display and human-computer interaction. The utility model improves the phenomenon of missed judgment and misjudgment of the monitoring system caused by problems such as independent monitoring quantity, low data fusion degree and large amount of comprehensive analysis calculation, and improves the level of equipment intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a principle block diagram of the utility model;

[0015] Figure 2 This is the schematic diagram of the filter amplifier circuit;

[0016] Figure 3 It is the schematic diagram of AD conversion circuit;

[0017] Figure 4 It is a parameter diagram for comprehensive monitoring unit status analysis. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] This embodiment discloses a GIS status comprehensive monitoring device, such as Figure 1 As shown, it includes a UHF partial discharge monitoring unit, a circuit breaker mechanical characteristic monitoring unit, an SF6 micro-water density online monitoring unit, a comprehensive analysis host computer and a communication module.

[0021] The UHF PD monitoring unit consists of 6 UHF PD sensors, 2 external phase sensors, and 1 acquisition device. The sensor detection frequency band is 300MHz-1500MHz, the detection range is -75dBm-0dBm, and the sensor is fixed on the GIS basin insulator by a stainless steel tie. The BNC to N-type coaxial cable is used between the sensor and the acquisition device to achieve signal transmission.

[0022] A collection device includes 1 power board, 2 partial discharge collection boards, 1 main control board and 1 network communication board. The collection board input uses SMA connectors, including 4 channels A / B / C / D. For three-phase box equipment, A / B / C sensors (A-phase ultra-high frequency partial discharge sensor, B-phase ultra-high frequency partial discharge sensor, C-phase ultra-high frequency partial discharge sensor) are installed in the same position of the same structure of A / B / C three phases. D channel can be connected to an external synchronous phase signal, that is, D channel receives the signal of the phase sensor. The phase can also be set by software, using an internal synchronization method, that is, in other embodiments, a method without a phase sensor can be adopted.

[0023] The partial discharge acquisition board is equipped with 4-channel filtering and amplifying circuits, 4-channel AD conversion circuits and an FPGA chip. The 4-channel filtering and amplifying circuits and the 4-channel AD conversion circuits are respectively connected to the three-phase ultra-high frequency partial discharge sensor and the phase sensor. The signals collected by the 4-channel filtering and amplifying circuits and the 4-channel AD conversion circuits are transmitted in parallel to the FPGA chip.

[0024] Specifically, the AD8066 chip is used for filtering and amplification, and the AD9226 chip is used for AD conversion and acquisition. Take one of the input signals as an example. Figure 2 , Figure 3 The PD signal input channel CHA pin 1 passes through sampling resistors R65, R66, and capacitor C95 before entering the AD8066 voltage feedback amplifier. The AD8066 reference signal input is CHA_NREF, which is input after passing through resistor R70 and then through R69's NET1 connection line to Figure 3 The VINA port of the AD9226 sampling chip, the CAPT and CAPB ports of the AD9226 sampling chip are connected to the reference voltage for eliminating noise, that is, Figure 2 NET2 and NET3 in the data acquisition device. The 12-bit digital signal after AD conversion is input into the FPGA chip EP4CE10F17C8N through DB0-DB11, resistors R111-R100, and the four signals A / B / C / D enter the FPGA chip in parallel for high-speed acquisition and processing. The FPGA chip sends the processed data to the main control chip STM32407IGT6 for statistical calculation, generates PRPD / PRPS and other spectrum data, and realizes data forwarding and network port communication. The main control chip of the acquisition device completes edge analysis such as discharge type identification and discharge quantity analysis. The main control board realizes the switching of 61850 and CMS communication protocols, and the acquisition unit uploads the edge calculated data to the comprehensive analysis host computer in the form of network port or optical port.

[0025] The SF6 micro-water density monitoring unit includes 4 485 acquisition channels, each of which can be connected to 8 SF6 micro-water density integrated sensors. The density detection range is 0.01~1.0MPa, and the measurement accuracy is better than ±0.75% (FS); the micro-water detection range is 20~2000uL / L, and the measurement accuracy is better than ±4% (FS). The SF6 micro-water density sensor is installed at the SF6 gas filling port, and a three-way adapter is used, which does not affect the SF6 gas filling and the air tightness of the equipment. The SF6 micro-water density sensor and the monitoring unit use the serial port RS485 communication form to transmit data to the acquisition unit. The data uploaded by the acquisition unit includes temperature, pressure, 20℃ pressure, density, micro-water, 20℃ micro-water, dew point, relative humidity, time information, etc. After edge computing processing, the acquisition unit transmits it to the comprehensive analysis host computer in the form of network port or optical port.

[0026] The circuit breaker mechanical characteristic monitoring unit consists of 2 opening current sensors, 1 closing current sensor, 1 energy storage motor current sensor, 1 angular displacement sensor and 1 acquisition device. The opening current sensor, closing current sensor and energy storage motor current sensor all use Hall current sensors. The current measurement range of the opening and closing coils is 0~10A, and the measurement accuracy is better than 1%FS; the current measurement range of the energy storage motor is -50A~+50A, and the measurement accuracy is better than 1%FS; the Hall current sensor is a through-type structure, and the terminal leads of the opening and closing coils pass through the inside of the current sensor, and are fixed by PCB welding or special tooling. The angular displacement sensor has a measurement linear accuracy better than 2*pi / 1024 and is installed at one end of the circuit breaker transmission main shaft. The main shaft is connected to the moving contact through the operating mechanism to indirectly obtain the moving contact action data. The uploaded data includes data type, current, opening / closing state, time; moving contact displacement, opening / closing speed, etc. After edge computing processing, the acquisition unit transmits it to the comprehensive analysis host computer in the form of a network port or optical port.

[0027] The improved multi-level fuzzy comprehensive evaluation model is built into the comprehensive analysis host computer. The basic status, insulation status, and mechanical status of the equipment are processed separately, and a first-level evaluation parameter set is established. According to the parameter characteristics and the requirements of the on-site operation and maintenance guidelines, different levels of alarm thresholds are set, and the evaluation weight coefficient is obtained based on the actual on-site data training. According to the main factor highlighting model, the single factor weighting and evaluation status membership are adjusted, and the operation status analysis report and operation and maintenance repair suggestions are given, and the monitoring data, operation status, and alarm information are sent to the main station system. The main functions of the comprehensive monitoring device are real-time data extraction, comprehensive algorithm analysis, data storage, and communication functions. The comprehensive monitoring unit is developed using QT, and each functional module is processed using different independent processes. The data extraction process mainly obtains real-time data from each monitoring unit and stores it in the real-time database; the data processing process uses a dynamic interface to call real-time data from the database and send it to the comprehensive analysis algorithm for analysis and calculation, and obtains operation statistics, event records, fault data, alarm data, etc., and the results are stored in the historical database; and data display is performed.

[0028] The comprehensive analysis host computer is connected to the cloud platform, service gateway machine, comprehensive application host, front-end server or station system through the communication module. The communication module is a router or a switch.

[0029] In the above process, the edge calculations performed by each monitoring unit and the comprehensive calculations performed by the comprehensive analysis host computer are conventional technical means in the field, and are not the improvement points of the utility model. The improvement point of the utility model is to integrate multi-parameter sensors together to form a GIS status comprehensive monitoring device.

[0030] Example 2

[0031] Take the 110kV GIS equipment of a certain substation as an example. Multi-parameter sensors are installed on the GIS. The ultra-high frequency partial discharge sensor is installed externally, on the outside of the non-enclosed pot-type insulator, and installed on the circuit breaker, transformer and long bus section respectively, for a total of 3. The SF6 density sensor is installed at the GIS independent air chamber inflation port, for a total of 6. The sensor installation adopts a three-way interface, which does not affect the air tightness of the GIS. The current sensor adopts a through-core structure and PCB placement; the terminal leads of the opening and closing coils pass through the inside of the current sensor, for a total of 4, 1 main opening coil, 1 auxiliary opening coil, and 1 photoelectric encoder for the angular displacement sensor, which is installed at one end of the circuit breaker transmission main shaft and installed using a special bracket. The contact opening and closing speeds are calculated through the circuit breaker and the operating mechanism linkage model.

[0032] Connect the sensor signal lines to each monitoring unit, and carry out the integrated monitoring unit wiring connection and on-site arrangement, and conduct on-site unit testing and system monitoring performance testing.

[0033] Partial discharge simulation tests are performed using special steep pulse partial discharge generating instruments; opening and closing operations are performed to simulate mechanical characteristic data; GIS is filled with SF6 gas at a pressure of 0.3MPa, and density sensor data is calibrated and uploaded.

[0034] Use the device to collect equipment status and conduct comprehensive analysis. View the analysis results in the comprehensive analysis unit to view the correlation between different faults in insulation characteristics, mechanical characteristics and gas characteristics. Figure 4 shown.

[0035] The above embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A GIS status comprehensive monitoring device, characterized in that: It includes a UHF partial discharge monitoring unit, a circuit breaker mechanical characteristic monitoring unit and a SF6 micro-water density online monitoring unit. The UHF partial discharge monitoring unit includes a UHF partial discharge sensor and a collection device. The collection device includes a filter amplifier circuit, an AD conversion circuit, an FPGA chip and a main control chip. The UHF partial discharge sensor, the filter amplifier circuit, the AD conversion circuit and the FPGA chip are connected in sequence to realize the parallel collection of partial discharge signals. The FPGA chip is connected to the main control chip to transmit the collected partial discharge signals to the main control chip; the SF6 micro-water density monitoring unit includes a SF6 micro-water density sensor, a 485 communication circuit and a main control chip. The SF6 micro-water density sensor is connected to the main control chip via a 485 communication circuit; the circuit breaker mechanical characteristic monitoring unit includes a switch-off current sensor, a switch-on current sensor, an energy storage motor current sensor, an angular displacement sensor and a collection device. The switch-off current sensor, the switch-on current sensor, the energy storage motor current sensor and the angular displacement sensor are respectively connected to the collection device.

2. The GIS status comprehensive monitoring device according to claim 1 is characterized in that: The filtering and amplifying circuit includes an amplifier. The ultra-high frequency partial discharge sensor is connected to the positive input terminal of the amplifier via resistors R65 and R66. The inverting input terminal of the amplifier is connected to the reference voltage via resistor R70. The output terminal of the amplifier is connected to the input terminal of the AD conversion circuit via resistor R69. The AD conversion circuit is implemented based on the AD9226 chip. The output terminal of the AD conversion circuit is connected to the FPGA chip.

3. The GIS status comprehensive monitoring device according to claim 1 is characterized in that: The UHF partial discharge monitoring unit also includes a phase sensor, which is connected to a filter amplifier circuit, an AD conversion circuit, and an FPGA chip in sequence.

4. The GIS status comprehensive monitoring device according to claim 3 is characterized in that: The UHF partial discharge sensor includes an A-phase UHF partial discharge sensor, a B-phase UHF partial discharge sensor, and a C-phase UHF partial discharge sensor. Each three-phase UHF partial discharge sensor corresponds to a phase sensor. The filter amplifier circuit, the AD conversion circuit, and the FPGA chip are integrated on the partial discharge acquisition card. Each partial discharge acquisition card includes 4 channels, namely, A, B, C, and D. That is, each partial discharge acquisition card includes an FPGA chip and 4 filter amplifier circuits and 4 AD conversion circuits. The 4 filter amplifier circuits and the 4 AD conversion circuits are respectively connected to the three-phase UHF partial discharge sensor and the phase sensor. The signals collected by the 4 filter amplifier circuits and the 4 AD conversion circuits are transmitted to the FPGA chip in parallel.

5. The GIS status comprehensive monitoring device according to claim 1 is characterized in that: The micro-water density sensor is installed at the SF6 filling port using a three-way adapter.

6. The GIS status comprehensive monitoring device according to claim 1 is characterized in that: The opening current sensor, closing current sensor, and energy storage motor current sensor all use Hall current sensors. The Hall current sensor is a through-type structure, and the terminal leads of the opening and closing coils pass through the inside of the Hall current sensor.

7. The GIS status comprehensive monitoring device according to claim 1 is characterized in that: The angular displacement sensor is installed at one end of the circuit breaker transmission main shaft, and the circuit breaker transmission main shaft is connected to the moving contact through the operating mechanism, so that the angular displacement sensor obtains the moving contact action data.

8. The GIS status comprehensive monitoring device according to any one of claims 1 to 7, characterized in that: It also includes a comprehensive analysis host computer and a communication module. The UHF partial discharge monitoring unit, the circuit breaker mechanical characteristics monitoring unit, and the micro-water density online monitoring are connected to the comprehensive analysis host computer through an optical port or a network port. The comprehensive analysis host computer is connected to the cloud platform, service gateway machine, comprehensive application host, front-end server or station-end system through the communication module.

9. The GIS status comprehensive monitoring device according to claim 8, characterized in that: The communication module is a router or a switch.

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