CN101782437A - High-voltage switch contact temperature online monitoring device and method thereof - Google Patents

High-voltage switch contact temperature online monitoring device and method thereof Download PDF

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Publication number
CN101782437A
CN101782437A CN200910029038A CN200910029038A CN101782437A CN 101782437 A CN101782437 A CN 101782437A CN 200910029038 A CN200910029038 A CN 200910029038A CN 200910029038 A CN200910029038 A CN 200910029038A CN 101782437 A CN101782437 A CN 101782437A
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China
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circuit
temperature
microprocessor
switch contact
receiving unit
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CN200910029038A
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Chinese (zh)
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CN101782437B (en
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周骁威
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常州帕斯菲克自动化技术有限公司
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Publication of CN101782437A publication Critical patent/CN101782437A/en
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Publication of CN101782437B publication Critical patent/CN101782437B/en

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Abstract

The invention discloses high-voltage switch contact temperature online monitoring device and method thereof. The high-voltage switch contact temperature online monitoring device comprises an emitting part power supply circuit, a temperature acquisition circuit, an emitting part microprocessor, a wireless emission circuit, a wireless receiving circuit, a receiving part microprocessor, a receiving part display circuit and a receiving part power supply circuit. When the high-voltage switch contact temperature online monitoring device is in use, the temperature acquisition part and an external power supply are not necessary to be connected, and energy is directly acquired on a high-voltage bus by utilizing an electromagnetic field coupling method to provide consistent electric energy for a collector. By adopting small CT and magnetic saturation technologies, an emitting part power supply can acquire stable voltage output in a wider current range (50-5000A). Wireless emission adopting micro-power emission with an open frequency band can not generate interference in other equipment, and a high-voltage temperature monitoring end and a display instrument end are fully separated. The temperature acquisition part of the high-voltage switch contact temperature online monitoring device is in cast with epoxy into clamp kits of different specifications so as to suit contact switches of different specifications and different shapes.

Description

High-voltage switch contact temperature online monitoring device and method thereof
Technical field
The present invention relates to a kind of on-line monitoring high-voltage switch contact contact temperature rise situation, and then, ensure the safe operation of electric system the high-voltage switch contact diagnosing malfunction.
Background technology
In order to guarantee the safe operation of electric system, the electric system thermal fault detection is subjected to people's generally attention, high voltage bus is when the contact loose contact of running overload or high-voltage switch gear, because of contact resistance becomes big, produce the heating phenomenon in the out-of-date meeting of load current flow, this heating phenomenon causes insulation ag(e)ing even puncture, thereby causes short circuit, form major accident, cause heavy economic losses.
In the electric power system that adopts the power cable power transmission and distribution, there is statistics to show, the cable operation troubles more than 90% is caused by joint fault, and the joint contact resistance becomes greatly, overload etc. causes that connector temperature is too high, is the main cause of initiating failure.Investigation of Beijing DianKeYuan and statistics show: the temperature rise fault accounts for 8.9% in the whole nineties China Power system distribution voltage level switch accident, therefore, detect and monitor the temperature of high-voltage switch gear contact, bus and high-voltage cable joint, find in advance and get rid of hot stall hidden danger, the safe and reliable operation of electric system is had very important significance.
For this respect Study on Technology, whether contact with measurand both at home and abroad, be divided into two kinds of methods of contact temperature-measuring and contactless temperature-measuring according to sensor.Contactless temperature-measuring method adopts the thermal infrared detection technique, it is according to existing certain functional relation to make between relative radiation intensity of object and the temperature, its advantage is that measurement range is big, the accuracy height, but there is significant limitation in the restriction owing to visual angle and the distance coefficient of instrument own in actual applications, the another one shortcoming of infrared thermometer is to need manual inspection, sometimes also can receive the influence of factors such as weather, it can't detect the high-voltage switch gear contact that is enclosed in the rack, and it is integrated to realize that high-tension apparatus and temperature online detect.The contact temperature-measuring method is then many, mainly contain following several: (1) colour temperature sheet method, adopt color chips (also claiming temperature indicating record label), a series of chemistry and physical change take place in its back that is heated, by the change of molecular structure, cause catoptrical color to change, can judge temperature according to its color, shortcoming is low, the poor reliability of accuracy, can not carry out quantitative measurment, and concerning high-voltage switch gear contact etc., in the sealing rack, almost cannot see color during operation; (2) optical fiber temperature-measurement technology, U.S. Lu Ke company is under the subsidy of American Electric Power research institute (EPRI), developed and aimed at the electric system application and the fluorescence optical fiber temperature measuring equipment of Development and Production monitoring Transformer Winding temperature, this is a kind of technology of brand-new on-line monitoring high voltage electric equipment internal temperature, optical fiber has good electrical insulation properties and anti-electromagnetic interference capability, probe can be embedded in simultaneously the selected position of high pressure of power equipment inside, directly measure the actual temperature change of this point, but optic fiber thermometer costs an arm and a leg, the installation of optic fiber thermometer and transform cumbersome, the insulation ag(e)ing of optical fiber after the long-time running, cause the mutual breakdown problem of high and low pressure side, the optical fiber temperature-measurement technology is not promoted the use of as yet at home; (3) other contact thermography: domesticly multiple online contact temperature-measuring scheme also occurred, mainly be that temperature sensor is installed on the switch contact, by wireless radio-frequency or intensity modulation technology temperature signal is delivered to ground, by ground-based computer temperature signal is handled then, how these schemes all exist without exception to the problem of temperature sensor power supply, and following several power supply mode (1) battery method is arranged usually: disadvantage can't guarantee at whole high-pressure side normal power supply of non-turn(a)round; (2) photoelectric cell method: the high-pressure side sensor uses silicon photocell, provide light source by the ground low-pressure side, thereby it is electric that sensor is got, and shortcoming is to be difficult for installing and the back being installed because the on high-tension side phase insulation of the excessive influence of silicon photocell area; (3) low-pressure side power supply: shortcoming is the potential possibility that exists mutual feed of low-pressure side and high-pressure side and puncture.
Summary of the invention
Technical matters to be solved by this invention and method thereof provide a kind of external power supply that do not need, but the big electric current that utilizes high-voltage switch gear to flow through obtains the devices and methods therefor of a kind of on-line monitoring high-voltage switch contact contact temperature rise of power supply power supply electric energy by the method for electromagnetic coupled, and then, ensure the device of the safe operation of electric system to the high-voltage switch contact diagnosing malfunction.
For solving the problems of the technologies described above, the invention provides a kind of on-line monitoring high-voltage switch contact contact temperature rise monitoring device and method thereof, comprise the microprocessor of radiating portion power circuit, temperature collection circuit, radiating portion microprocessor, radio transmitter, wireless receiving circuit, receiving unit, the display circuit and the receiving unit power circuit composition of receiving unit.
The radiating portion power circuit is by the induction by current coil, the iron core of high permeability material, voltage stabilizing and filtering circuit are formed, the induction by current coil is on the iron core of high permeability material, the concrete number of turns needs to determine by a certain percentage according to tested current value size, the iron core of high permeability material is made and is sleeved on tested switch contact position after ring-type seals with insulating material, just be coupled out the big electric current that is flow through by switch contact like this in the induction by current coil, two lead-in wires of induction by current coil output are connected with voltage transformation module, the radiating portion power supply not needing to have realized external power supply like this, utilize the electromagnetic field couples principle on high voltage bus, directly to obtain energy and provide electric energy for collector, solved conventional batteries power supply replacement difficulty, sometimes the problem that can't change, simultaneously owing to adopt little CT and magnetic saturation technology to make the radiating portion power circuit realize that the range of current 50A-5000A of broad all can provide stable voltage, is respectively the microprocessor of radiating portion, temperature collection circuit and radio transmitter provide power supply.Temperature collection circuit is realized the collection of temperature by digital temperature sensor or thermistor, temperature collection circuit is delivered to the radiating portion microprocessor with the temperature signal of the contact contact that collects and is handled, deliver to radio transmitter after the temperature signal modulation after the radiating portion microprocessor will be handled, wireless transmit adopts open frequency range micropower emission can not produce interference to miscellaneous equipment, realized that simultaneously high pressure temperature monitoring end and Displaying Meter end isolate fully, wireless receiving circuit is delivered to the microprocessor processes of receiving unit after with the temperature signal demodulation that receives, the display circuit that temperature value after the microprocessor of receiving unit will be handled is delivered to receiving unit shows that the high-voltage switch contact temperature online monitoring device temperature acquisition is partly with poured with epoxy resin switch contacts (for example round contact or flat contact) to be suitable for different size in the anchor clamps external member of different size.
The present invention has positive effect: in (1) high-voltage switch contact temperature online monitoring device of the present invention, adopt little CT and magnetic saturation technology to make the radiating portion power circuit realize that the range of current 50A-5000A of broad all can provide stable operating voltage.(2) high-voltage switch contact temperature online monitoring device wireless transmit of the present invention adopts open frequency range micropower emission can not produce interference to miscellaneous equipment, has realized that simultaneously high pressure temperature monitoring end and Displaying Meter end isolate fully.(3) high-voltage switch contact temperature online monitoring device of the present invention, temperature acquisition partly are cast in the interior switch contacts (for example round contact or flat contact) to be suitable for different size of anchor clamps external member of different size.
Description of drawings
Fig. 1 is the temperature acquisition part schematic diagram of embodiment 1.
Fig. 2 is the schematic diagram of the temperature display part of embodiment 1.
Fig. 3 is the schematic diagram of the radiating portion power circuit of embodiment 1.
Wherein: 1-high-voltage switch contact conductor, 2-induction by current coil, 3-iron core, 4-voltage stabilizing and filtering circuit.
Embodiment
See Fig. 1, Fig. 2, shown in Figure 3, the high-voltage switch contact temperature online monitoring device of present embodiment comprises the microprocessor of radiating portion power circuit, temperature collection circuit, radiating portion microprocessor, radio transmitter, wireless receiving circuit, receiving unit, the display circuit and the receiving unit power circuit composition of receiving unit.
The radiating portion power circuit principle as shown in Figure 3, by the induction by current coil, the iron core of high permeability material, voltage stabilizing and filtering circuit are formed, this power supply mode is to utilize electromagnetic induction principle, obtain the alternating current electric energy by ferromagnetic formula mutual inductor from the high voltage bus induction, then through overcommutation, filtering, it after the voltage stabilizing high-pressure side circuit supply, this coil is in high-pressure side, insulating requirements is low, simplified design greatly, power system load alters a great deal, high voltage bus electric current thereupon alter a great deal (several amperes of supreme kiloamperes), the busbar short-circuit momentary current can surpass ten times of rated current, the work that big working range like this is power transformer and mu balanced circuit brings exceptional hardship, therefore, to reduce the dead band electric current as far as possible, guarantee when the electric system electric current is very little, can provide and be enough to drive the power that is in the high-pressure side electronic circuit, the 2nd, when Short-Circuit High Current appears in system, can absorb unnecessary energy, give stable power of electronic circuit, itself can not damage because of superpotential yet, adopt little CT and magnetic saturation technology to address the above problem, the radiating portion power circuit can directly obtain lasting electric energy from the range of current (50A-5000A) of broad, do not need external power supply directly to give temperature collection circuit, radiating portion microprocessor and radio transmitter provide power supply, can be the reserve battery charging simultaneously.
The collection of temperature can be adopted digital temperature sensor AD590, LM92 in the temperature collection circuit, also can adopt thermistor (for example 10K Ω, 35K Ω) to finish; The microprocessor of radiating portion microprocessor and receiving unit is selected PIC, NSP430,51 or AVR series etc. for use, the wireless transmit of radio transmitter and wireless receiving circuit and the rf frequency of wireless receiving are selected integration module MAX1479, MAX7030 or MAX7031 for use in the 315-960MHz scope; The wireless technology of utilizing high pressure temperature monitoring end and Displaying Meter end has realized isolating fully, the microprocessor of receiving unit leaves wireless (GPRS) and wired (485 or 232) interface circuit, the high-voltage switch contact temperature online monitoring device temperature acquisition partly with poured with epoxy resin in the anchor clamps external member of different size to be suitable for different size and difform switch contacts (circle contact or flat contact); The display circuit of receiving unit is used to show detected high-voltage switch contact temperature, when temperature rise surpasses the higher limit of setting, sends overtemperature alarm contact contact point signal immediately; The receiving unit power circuit mainly is made up of rectification, voltage stabilizing, filtering circuit, can adopt the dc-battery power supply, also can adopt ac power supply.

Claims (2)

1. high-voltage switch contact temperature online monitoring device and method thereof, it is characterized in that, comprise that microprocessor (6), the display circuit (7) of receiving unit, the receiving unit power circuit (8) of radiating portion power circuit (1), temperature collection circuit (2), radiating portion microprocessor (3), radio transmitter (4), wireless receiving circuit (5), receiving unit formed; Radiating portion power circuit (1) is made up of the iron core of induction by current coil and high permeability material, the induction by current coil is on the iron core of high permeability material, the concrete number of turns needs to determine by a certain percentage according to tested current value size, the iron core of high permeability material is made and is sleeved on tested switch contact position after ring-type seals with insulating material, just be coupled out the big electric current that is flow through by switch contact like this in the induction by current coil, two lead-in wires of induction by current coil output are connected with voltage transformation module, are respectively the microprocessor (3) of radiating portion, temperature collection circuit (2) and radio transmitter (4) provide power supply; Temperature collection circuit (2) is installed near tested high-voltage switch contact position, detect high-voltage switch contact temperature, temperature collection circuit (2) is connected with radiating portion microprocessor (3), the temperature signal that temperature collection circuit (2) collects is delivered to radiating portion microprocessor (3) and is handled, deliver to radio transmitter (4) after the temperature signal modulation after radiating portion microprocessor (3) will be handled, wireless receiving circuit (5) will receive the microprocessor (6) of delivering to receiving unit after the temperature signal demodulation from radio transmitter (4) and handle, the microprocessor of receiving unit (6) is connected with the display circuit (7) of receiving unit, the display circuit (7) that temperature value after the microprocessor of receiving unit (6) will be handled is delivered to receiving unit shows, the power circuit of receiving unit (8) respectively with wireless receiving circuit (5), the display circuit (7) of microprocessor of receiving unit (6) and receiving unit is connected to them provides power supply.
2. high-voltage switch contact temperature online monitoring device as claimed in claim 1 and method thereof, the big electric current that utilizes high-voltage switch gear to flow through obtains the device of a kind of on-line monitoring high-voltage switch contact contact temperature rise of power supply power supply electric energy by the method for electromagnetic coupled.
CN 200910029038 2009-01-16 2009-01-16 High-voltage switch contact temperature online monitoring device CN101782437B (en)

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CN101782437B CN101782437B (en) 2012-12-05

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564625A (en) * 2010-12-29 2012-07-11 上海市电力公司 Wireless temperature sensor
CN102721851A (en) * 2012-06-13 2012-10-10 云南电力试验研究院(集团)有限公司电力研究院 Method for combined detection of current and temperature of electrified through-current part of electric equipment
CN102749150A (en) * 2011-04-20 2012-10-24 常州帕斯菲克自动化技术有限公司 Cable head temperature online monitoring device
CN102759409A (en) * 2012-07-07 2012-10-31 嵊州市电力公司 Online monitoring device for temperature of contact arms of high-voltage circuit breaker of 10-KV high-current switch cabinet
CN102879117A (en) * 2012-10-25 2013-01-16 宁夏电力公司银川供电局 Electric field induction powered disconnector contact temperature online measurement and wireless transmission device
CN102928099A (en) * 2011-08-11 2013-02-13 常州帕斯菲克自动化技术有限公司 Wireless temperature measuring device for contact of high-voltage switch
CN102967381A (en) * 2011-08-30 2013-03-13 常州帕斯菲克自动化技术有限公司 High-voltage switch equipment temperature on-line monitoring device and method based on wireless sensor network (WSN) technology
CN103115690A (en) * 2013-01-28 2013-05-22 辽宁巨龙腾飞电气有限公司 Method of online monitoring for high-voltage switch contact temperature rise
CN103424209A (en) * 2013-08-01 2013-12-04 苏州迪芬德物联网科技有限公司 Self-powered high-voltage electric power wireless temperature-measurement terminal
CN103808430A (en) * 2012-11-12 2014-05-21 常州帕斯菲克自动化技术股份有限公司 High-voltage device cable head temperature online monitoring device
CN104390725A (en) * 2014-10-14 2015-03-04 安徽科盟电子科技有限公司 Intelligent self-power-supplying wireless temperature measurement system
CN106568523A (en) * 2016-11-10 2017-04-19 中国电力科学研究院 Wireless temperature measuring system for high-voltage isolating switch

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564625A (en) * 2010-12-29 2012-07-11 上海市电力公司 Wireless temperature sensor
CN102749150A (en) * 2011-04-20 2012-10-24 常州帕斯菲克自动化技术有限公司 Cable head temperature online monitoring device
CN102928099A (en) * 2011-08-11 2013-02-13 常州帕斯菲克自动化技术有限公司 Wireless temperature measuring device for contact of high-voltage switch
CN102967381A (en) * 2011-08-30 2013-03-13 常州帕斯菲克自动化技术有限公司 High-voltage switch equipment temperature on-line monitoring device and method based on wireless sensor network (WSN) technology
CN102721851A (en) * 2012-06-13 2012-10-10 云南电力试验研究院(集团)有限公司电力研究院 Method for combined detection of current and temperature of electrified through-current part of electric equipment
CN102759409A (en) * 2012-07-07 2012-10-31 嵊州市电力公司 Online monitoring device for temperature of contact arms of high-voltage circuit breaker of 10-KV high-current switch cabinet
CN102879117A (en) * 2012-10-25 2013-01-16 宁夏电力公司银川供电局 Electric field induction powered disconnector contact temperature online measurement and wireless transmission device
CN103808430A (en) * 2012-11-12 2014-05-21 常州帕斯菲克自动化技术股份有限公司 High-voltage device cable head temperature online monitoring device
CN103115690A (en) * 2013-01-28 2013-05-22 辽宁巨龙腾飞电气有限公司 Method of online monitoring for high-voltage switch contact temperature rise
CN103424209A (en) * 2013-08-01 2013-12-04 苏州迪芬德物联网科技有限公司 Self-powered high-voltage electric power wireless temperature-measurement terminal
CN104390725A (en) * 2014-10-14 2015-03-04 安徽科盟电子科技有限公司 Intelligent self-power-supplying wireless temperature measurement system
CN106568523A (en) * 2016-11-10 2017-04-19 中国电力科学研究院 Wireless temperature measuring system for high-voltage isolating switch

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Address after: 213022 B2, north of innovation and technology building, Xinbei District, Jiangsu, Changzhou

Patentee after: Changzhou Paz Fick Automation Technology Co., Ltd.

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