CN110849480A - Temperature monitoring system for high-voltage electrical equipment - Google Patents
Temperature monitoring system for high-voltage electrical equipment Download PDFInfo
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- CN110849480A CN110849480A CN201911028955.7A CN201911028955A CN110849480A CN 110849480 A CN110849480 A CN 110849480A CN 201911028955 A CN201911028955 A CN 201911028955A CN 110849480 A CN110849480 A CN 110849480A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 19
- 238000009529 body temperature measurement Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000003331 infrared imaging Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000375 direct analysis in real time Methods 0.000 description 1
- 238000012063 dual-affinity re-targeting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J2005/106—Arrays
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Abstract
A temperature monitoring system for high-voltage electrical equipment belongs to the technical field of power systems. The invention aims to provide a temperature monitoring system special for high-voltage electrical equipment for measuring temperature change of a high-voltage electrical cabinet. The invention comprises a single chip microcomputer (STM 32F103RCT 6), a temperature sensor (MLX 90640), a data communication module (MAX 485 ESA) and a power supply module (WRB 2403S-1WR 2). The invention takes STM32F103RCT6 with high performance, low cost and low power consumption as the core of the whole temperature measuring system, and simultaneously adopts a MLX90640 novel temperature sensor of Melexis company. The advantage set of the existing equipment is effectively utilized, and the cost and the measuring time are reduced on the basis of ensuring the accuracy of the measured temperature.
Description
Technical Field
The invention belongs to the technical field of power systems.
Background
The high-voltage switch cabinet is used as an extremely important electric device in an electric power system. In the process of power transmission, important functions such as opening and closing control of a power line and protection of electric equipment are carried. Due to the sealing property and the compactness of the switch cabinet, the heat cannot be effectively dissipated; in addition, the switch cabinet has high voltage, large current and high magnetic field, so that the problem of heating inevitably exists. If too high temperature in the switch cabinet can not be found in time, the problems of fire, power failure and the like can be caused, and the stability of a power system is seriously influenced. Therefore, it is very important to monitor the temperature of the high-voltage switch cabinet in real time. By monitoring the temperature, the fault diagnosis of the heating equipment can be carried out in advance, and the occurrence of power accidents is avoided.
At present, in the aspect of temperature monitoring in a high-voltage switch cabinet, scholars and related enterprises at home and abroad develop a great deal of research and engineering practice, and the temperature monitoring methods include methods such as electronic contact temperature measurement of a temperature sensor, fiber bragg grating temperature measurement, sound surface temperature measurement, infrared radiation temperature measurement, infrared imaging temperature measurement and the like, and mainly monitor the temperature of important current-carrying connecting parts such as high-voltage contacts, outlet ports and the like in the cabinet. The electronic contact temperature measurement method of the temperature sensor is easily influenced by a strong magnetic field in the switch cabinet, and the measurement error is large. The fiber grating temperature measurement method is easy to influence the wavelength of the fiber grating by the cross of temperature and stress, and has high installation cost. Although the sound surface temperature measurement is wireless and passive, the equipment cost is higher, and certain unknown property is also provided in the field application aspect. The infrared radiation temperature measurement has the problems of complex wiring, influence of light paths on measurement errors and the like.
Disclosure of Invention
The invention aims to provide a temperature monitoring system special for high-voltage electrical equipment for measuring temperature change of a high-voltage electrical cabinet.
The invention comprises a single chip microcomputer (STM 32F103RCT 6), a temperature sensor (MLX 90640), a data communication module (MAX 485 ESA) and a power supply module (WRB 2403S-1WR 2).
The temperature sensor part of the temperature measuring system adopts a novel low-power-consumption high-precision infrared imaging sensor MLX90640, so that the temperature information can be acquired more accurately and visually.
The main control chip selects STM32F103RCT6, a set of comprehensive power saving modes is favorable for the requirement of the system on low power consumption, and the system has standard and advanced communication interfaces, thereby ensuring the stability of data transmission.
According to the invention, through a QZ01-485 wireless to 485 data communication module, by using an IEEE802.15.4 standard and a ZigBee protocol, a transparent transmission mode of data among equipment from one point to multiple points is adopted, and the real-time temperature of the electrical equipment is uploaded to an upper computer management system, so that the distributed monitoring and management of the temperature of the electrical equipment are realized.
The invention takes STM32F103RCT6 with high performance, low cost and low power consumption as the core of the whole temperature measuring system, and simultaneously adopts a MLX90640 novel temperature sensor of Melexis company. The advantage set of the existing equipment is effectively utilized, and the cost and the measuring time are reduced on the basis of ensuring the accuracy of the measured temperature.
Drawings
Fig. 1 is a block diagram of the circuit of the present invention.
Detailed Description
The whole system of the invention consists of four parts, namely a main control chip, a temperature sensor, a data communication module and a power supply module.
A main control chip: the main control chip of the temperature detection module adopts STM32F103RCT6, whichThe chip has 32-bit Cortex-M3 CPU as core, 72 MHz clock frequency, 256KB flash memory, 64 KB SRAM, and on-board resources including various enhanced I/O connected to two APB buses and ADC, timer, and clock frequency controller,
And DART and other peripherals, and has standard and advanced communication interfaces, and is a high-performance embedded single-chip microcomputer with the advantages of low working voltage, low power consumption, wide temperature range, high sensitivity, high clock master frequency, strong anti-interference performance and the like. The STM32F103RCT6 works in the temperature range of-40 to + 105 ℃, and meets the environmental requirements of a high-voltage switch cabinet. The minimum system of the single chip microcomputer comprises a clock module, a reset module, an SWD debugging circuit, a power module, SCL (clock cycle), SDA (serial bus architecture) pins connected with a temperature sensor, and 485-EN, 485-TX and 485-RX pins connected with a communication module.
A temperature sensor: the MLX90640 adopted by the system is a novel infrared sensor released by Melexis, and is an economical and efficient choice for high-precision non-contact temperature measurement. The chip has a 32x24 pixel infrared array, a working temperature range of-40 deg.C TO 85 deg.C, a measurable object temperature range of-40 deg.C TO 300 deg.C, and a 4-pin TO39 package with standard in the industry
Compatible digital interfaces. The temperature sensor module is selected due to the advantages of small size, low cost, high integration level, high precision, low power consumption, wide view field and the like, the MLX90640 in the temperature sensor module design circuit is powered by 3.3V voltage, and the SCL pin and the SDA pin of the MLX90640 respectively pass through the current limiting resistor and the pull-up resistorThe interface is connected to the master chip.
The electric equipment on-line monitoring device based on the MLX90640 infrared temperature measurement module can realize infrared temperature imaging of key parts such as high-voltage contacts in a high-voltage switch cabinet. Because the temperature imaging is 32x24 pixel infrared array, through the processing of main control chip to temperature data, can show real-time imaging temperature more directly perceived high-efficient to can preserve the temperature and draw into the curve and carry out data analysis, when certain node temperature exceeded given scope, the system can obtain real-time detection and send high temperature early warning.
A data communication module: the system uses a MAX485ESA type data communication transceiver, which is a standard RS485 transceiver, and comprises an output driver and a signal receiver for half-duplex communication. The MAX485 has the tri-state output characteristic, when the MAX485 is used, the bus can be simultaneously connected with 32 MAX485 chips at most, the communication baud rate can reach 2.5Mbps, and the communication bus has the characteristics of low power consumption, high precision, limited slew rate and the like. The RO pin of the MAX485ESA chip is connected with the 485-RX pin of the main control chip through a current-limiting resistor,
the pin DE is connected with a 485-EN pin of the main control chip, the pin DI is connected with a 485-TX pin of the main control chip through a current-limiting resistor, the pin A is connected with a power supply through a large resistor, the pin B is grounded through the large resistor, a small resistor is connected between the pins A, B, and the pin A, B is grounded through a bidirectional voltage stabilizing diode respectively, so that overvoltage is prevented, and the 485 chip is protected.
A power supply module: the stability and voltage accuracy of the power supply are two important indicators of the power supply module in a system. The power supply in the system is 24V, and the power supply of the main control chip, the temperature sensor and the data communication module is 3.3V, so that the DC-DC conversion chip adopted by the system is WRB2403S-1WR2, and the system has the characteristics of wide input, I/O isolation, short-circuit protection, wide working temperature range and the like. The circuit connects 24V voltage to VIN pin of WRB2403S-1WR2 chip, and 3.3V voltage can be obtained at VO pin. In addition, a capacitor added between the power supply and the ground plays a role in filtering, and the obtained voltage meets the requirements of system voltage precision and stability.
The novel advantages of the invention are: high integration, low-power consumption, high accuracy, big visual angle etc. through 485 commentaries on classics wireless data transfer modes, realize the real-time collection of temperature among the many sets of high tension switchgear, with data through wireless upload to the surveillance center and gather and prejudge. The infrared temperature measurement method has the advantages of visual image, no contact with a high-voltage contact and no strong electromagnetic interference, the wireless communication technology solves the problem of difficult wiring, the whole system has low power consumption, high performance and high integration level, and meanwhile, the infrared temperature measurement method is convenient to install, has extremely high cost performance and has wide prospect in engineering application.
The main control chip passes
The bus reads the temperature information that temperature sensor gathered, and data communication module utilizes 485 buses to change wireless data transfer for the surveillance center, and power module provides reliable and stable operating voltage for entire system. The on-line monitoring device of the electrical equipment is used as a lower computer subsystem and distributed in important electrical equipment devices such as a high-voltage switch cabinet and the like, a transparent transmission mode of data among equipment from one point to multiple points is adopted by a QZ01-485 wireless to 485 data communication module by utilizing an IEEE802.15.4 standard and a ZigBee protocol, and the real-time temperature of the electrical equipment is uploaded to an upper computer management system, so that the distributed monitoring and management of the temperature of the electrical equipment are realized.
Claims (4)
1. A temperature monitoring system for high voltage electrical equipment comprising: the temperature control system comprises a single chip microcomputer (STM 32F103RCT 6), a temperature sensor (MLX 90640), a data communication module (MAX 485 ESA) and a power supply module (WRB 2403S-1WR 2).
2. The wireless infrared temperature measurement system of the high-voltage switch cabinet as claimed in claim 1, wherein: the temperature sensor part of the temperature measurement system selects a low-power-consumption high-precision novel infrared imaging sensor MLX90640, so that the temperature information can be acquired more accurately and visually.
3. The wireless infrared temperature measurement system of the high-voltage switch cabinet as claimed in claim 1, wherein: the main control chip selects STM32F103RCT6, a set of comprehensive power saving modes is favorable for the requirement of low power consumption of the system, and the system has standard and advanced communication interfaces, thereby ensuring the stability of data transmission.
4. The wireless infrared temperature measurement system of the high-voltage switch cabinet as claimed in claim 1, wherein: through a QZ01-485 wireless to 485 data communication module, by using an IEEE802.15.4 standard and a ZigBee protocol, a transparent transmission mode of data among equipment from one point to multiple points is adopted, the real-time temperature of the electrical equipment is uploaded to an upper computer management system, and distributed monitoring and management of the temperature of the electrical equipment are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911028955.7A CN110849480A (en) | 2019-10-28 | 2019-10-28 | Temperature monitoring system for high-voltage electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911028955.7A CN110849480A (en) | 2019-10-28 | 2019-10-28 | Temperature monitoring system for high-voltage electrical equipment |
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| CN110849480A true CN110849480A (en) | 2020-02-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2396386Y (en) * | 1999-11-25 | 2000-09-13 | 刘志俊 | Temp tester for high-voltage and ultra-high voltage switch contact |
| US8160825B1 (en) * | 2011-10-26 | 2012-04-17 | Roe Jr George Samuel | Process for remote grounding, transmission sensing, and temperature monitoring device |
| CN203037358U (en) * | 2012-12-13 | 2013-07-03 | 西安理工大学 | High tension switchgear contact temperature monitoring system based on Zigbee |
| CN103454005A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | High-voltage bus wireless temperature-detection system |
| CN204189301U (en) * | 2014-11-04 | 2015-03-04 | 国家电网公司 | A kind of high voltage electric equipment temperature monitoring system |
| CN105634138A (en) * | 2016-03-18 | 2016-06-01 | 江苏联宏自动化系统工程有限公司 | Multifunctional three-phase electric power monitoring apparatus |
-
2019
- 2019-10-28 CN CN201911028955.7A patent/CN110849480A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2396386Y (en) * | 1999-11-25 | 2000-09-13 | 刘志俊 | Temp tester for high-voltage and ultra-high voltage switch contact |
| US8160825B1 (en) * | 2011-10-26 | 2012-04-17 | Roe Jr George Samuel | Process for remote grounding, transmission sensing, and temperature monitoring device |
| CN203037358U (en) * | 2012-12-13 | 2013-07-03 | 西安理工大学 | High tension switchgear contact temperature monitoring system based on Zigbee |
| CN103454005A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | High-voltage bus wireless temperature-detection system |
| CN204189301U (en) * | 2014-11-04 | 2015-03-04 | 国家电网公司 | A kind of high voltage electric equipment temperature monitoring system |
| CN105634138A (en) * | 2016-03-18 | 2016-06-01 | 江苏联宏自动化系统工程有限公司 | Multifunctional three-phase electric power monitoring apparatus |
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