CN202794410U - Monitoring system for leakage current of insulator - Google Patents
Monitoring system for leakage current of insulator Download PDFInfo
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- CN202794410U CN202794410U CN 201220333000 CN201220333000U CN202794410U CN 202794410 U CN202794410 U CN 202794410U CN 201220333000 CN201220333000 CN 201220333000 CN 201220333000 U CN201220333000 U CN 201220333000U CN 202794410 U CN202794410 U CN 202794410U
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Abstract
The utility model discloses a monitoring system for the leakage current of an insulator, which comprises a current/spread voltage acquisition unit, a signal amplifying unit, a filter, a data acquisition unit, a communication network and a monitoring terminal. The current/spread voltage acquisition unit is respectively connected with the insulator. The signal output end of the current/spread voltage acquisition unit is respectively connected with the signal input end of the signal amplifying unit. The signal output end of the signal amplifying unit is connected with the signal input end of the filter. The signal output end of the filter is connected with the signal input end of the data acquisition unit. The data acquisition unit is connected with the monitoring terminal through the communication network. The current/spread voltage acquisition unit comprises two serially connected sampling resistors and a thermal control unit. The thermal control unit comprises a thermistor. Since the two sampling resistors are connected in series with each other, the problem that the leakage current is large in dynamic range is solved. Meanwhile, due to the adoption of the thermal control unit, the above-threshold leakage current can be rapidly judged. Therefore, the monitoring system is more stable and more reliable.
Description
Technical field
The utility model relates to a kind of power transmission line monitoring system, particularly relates to a kind of insulator leakage current detect system of transmission line of electricity.
Background technology
Transmission line of electricity distributes extensively, layout is loose, and the monitoring of equipment parameter that forms is numerous, the storage data volume is huge, is a jumbo job to administering and maintaining of transmission line of electricity.For improving the management level of transmission line of electricity, strengthen the reliability of Operation of Electric Systems, require the circuit operating management department operation conditions of its circuit of administering to be had the grasp of comprehensive understanding, absence and potential faults to circuit have emphasis, regularly arrange to overhaul, and carry out the preparation of human and material resources for the service work that is about to carry out.
The flashover phenomenon is under action of high voltage, the disruptive discharge that gas or liquid medium occur along insulating surface, and behind the generation flashover, interelectrode voltage quickly falls to zero or close to zero, the spark in the flashover passage or electric arc destroy insulating surface.In the area of transmission line of electricity process, because the dunghills such as industry filth, the salt fog of sea wind, airborne dust accumulate and be attached to insulator surface gradually, form pollution layer.These dunghills contain the composition of soda acid and salt, and electric conductivity is bad when drying, after chance water makes moist, have higher electrical conductivity.When rain, snow melting, when the adverse weather such as misting, the dielectric strength of contaminated insulator reduces greatly, causes insulator flashover under normal working voltage, causes the pollution flashover accident of large-area power-cuts.To the insulator periodic monitoring, in time change poor insulator, adopt pollution proof insulator, in time cleaning is the advantageous measure that guarantees that insulator normally plays a role to contaminated insulator.The concentrated expression of voltage, weather, dunghill and net result during insulator leakage current can objectively respond operation insulator surface contamination until the overall process of flashover.Leakage current monitored to improve the ageing of filthy monitoring, more comprehensively reflect bunch of insulator contamination situation and insulating property, instruct relevant departments to remove in time the durability against pollution filthy and measure of employing reinforced insulation.The leakage current method is commonly used to carry out insulator pollution monitoring, and this method realizes conveniently, installs simple, but the leakage current variation range is very large, its dynamic range is 10 μ A-100 μ A, the precision that impact is measured makes the error of Monitoring Data larger, can not realize the accurate monitoring of insulator state.
Summary of the invention
The purpose of this utility model is to provide a kind of realization convenient in order to address the above problem, and installs simply, measures accurately insulator electric leakage supervisory system.
The utility model is achieved through the following technical solutions:
A kind of insulator leakage current detect described in the utility model system, comprise the current/voltage harvester, signal amplifying apparatus, wave filter, data collector and monitor terminal, described current/voltage harvester is connected with insulator, the signal output part of described current/voltage harvester is connected with the signal input part of described signal amplifying apparatus respectively, the signal output part of described signal amplifying apparatus is connected with the signal input part of described wave filter, the signal output part of described wave filter is connected with the signal input part of described data collector, described data collector is connected with described monitor terminal by communication network, described current/voltage harvester comprises sampling resistor and the thermally responsive control of two series connection, and described thermally responsive control comprises thermosensitive device.
Particularly, described thermosensitive device is thermistor, and the number of described thermosensitive device is at least one.
Particularly, described wave filter is low-pass filter or Hi-pass filter.
Particularly, described signal amplifying apparatus comprises stable-pressure device, and described stable-pressure device is voltage stabilizing diode.
Particularly, described signal amplifying apparatus also comprises the bias voltage device.
The beneficial effects of the utility model are:
Leakage current dynamic range scope is very large, the voltage that is difficult to select a suitable sampling resistor to make and obtains by it is a suitable scope, adopt the mode of a large resistance value sampling resistor and a little resistance sampling resistor series connection to solve the large drawback of leakage current dynamic range, introduce thermally responsive control and can judge rapidly the leakage current of superthreshold scope, in conjunction with dynamic current signal and spread voltage, make monitoring system more accurate, stable, reliable.
Description of drawings
Fig. 1 is system construction drawing of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments:
As shown in Figure 1, a kind of insulator leakage current detect described in the utility model system, comprise the current/voltage harvester, signal amplifying apparatus, wave filter, data collector, communication network and monitor terminal, described current/voltage harvester comprises sampling resistor and the thermally responsive control of two series connection, signal amplifying apparatus comprises operational amplifier, stable-pressure device and bias voltage device, described thermally responsive control comprises thermosensitive device, described current/voltage harvester is connected with insulator respectively, the signal output part of described current/voltage harvester is connected with the signal input part of described signal amplifying apparatus respectively, the signal output part of described signal amplifying apparatus is connected with the signal input part of described wave filter, the signal output part of described wave filter is connected with the signal input part of described data collector, and described data collector is connected with described monitor terminal by communication network.
The current/voltage harvester also comprises leakage current sensor, pulses of current sensor and spread voltage sensor, the mode that the leakage current that shutoff ring is obtained is introduced a sampling resistor produces a sampled voltage that can be fit to, when voltage signal that sampling resistor replaces and primary current signal are arranged altogether, without any isolation, can sample and in the back end signal modulate circuit, add the method for light-coupled isolation, interference in the anti-stop signal enters microprocessor, and EVAC (Evacuation Network Computer Model) is normally moved.The leakage current variation range is very large, be difficult to select a suitable employing resistance to make the voltage of obtaining by it a suitable scope, adopt the mode of two sampling resistor series connection to solve the large drawback of leakage current dynamic range, i.e. a large resistance value sampling resistor and a little resistance sampling resistor series connection.Thermally responsive control is connected with current collecting device, its thermosensitive device is thermistor, when electric leakage occurs in the insulator work state, thermistor is according to the large little trick of leakage current, and current collecting device gathers leakage current sensor, pulses of current sensor and the electric current by thermosensitive device simultaneously.
Through the Buffer output level of signal by being consisted of by operational amplifier behind the sampling resistor, in order to prevent overtension on the sampling resistor, when being about to flashover occurs as leakage current is very large, input end in amplifier adds voltage stabilizing diode, and voltage stabilizing diode can protect amplifier not to be damaged when voltage is higher than setting; Because single supply op is adopted in the rear end, the negative signal input can not be arranged, add a bias voltage device, all sinusoidal signals are done a voltage lifting; Owing to need to measure simultaneously power frequency component and pulse component in the leakage current, after the sampled voltage signal passes through analog switch, need to make respectively signal pass through a Hi-pass filter and low-pass filter, isolate power frequency component and pulse component.
Each insulator chain need to gather leakage current and spread voltage, and leakage current has low frequency and two paths of high frequency, and spread voltage only has low frequency channel.It is the same that the low frequency channel of leakage current is processed at signal with the low frequency channel of spread voltage, in order to reduce component number, low frequency that can multiplexing two signals is processed path, switches by an analog switch to gather leakage current low frequency component and spread voltage low frequency component.
Data collector is converted to digital signal with signal and is transferred to monitor terminal by communication network, the data processing equipment of monitor terminal is analyzed, is processed and reproduce signal, judge degree of strength and the development trend of Insulator Contaminant Discharge, realize the Insulator Contaminant Discharge early warning.
Above-described embodiment only is a kind of of the utility model embodiment; be illustrative and not restrictive, also have many variations all to belong to the technical solution of the utility model, therefore; not breaking away from change and the modification of making under the utility model design, all within protection domain of the present utility model.
Claims (5)
1. insulator leakage current detect system, comprise the current/voltage harvester, signal amplifying apparatus, wave filter, data collector and monitor terminal, described current/voltage harvester is connected with insulator, the signal output part of described current/voltage harvester is connected with the signal input part of described signal amplifying apparatus respectively, the signal output part of described signal amplifying apparatus is connected with the signal input part of described wave filter, the signal output part of described wave filter is connected with the signal input part of described data collector, described data collector is connected with described monitor terminal by communication network, it is characterized in that: described current/voltage harvester comprises sampling resistor and the thermally responsive control of two series connection, and described thermally responsive control comprises thermosensitive device.
2. a kind of insulator leakage current detect according to claim 1 system, it is characterized in that: described thermosensitive device is thermistor, the number of described thermosensitive device is at least one.
3. a kind of insulator leakage current detect according to claim 1 system, it is characterized in that: described wave filter is low-pass filter or Hi-pass filter.
4. a kind of insulator leakage current detect according to claim 1 system, it is characterized in that: described signal amplifying apparatus comprises stable-pressure device, described stable-pressure device is voltage stabilizing diode.
5. according to claim 1 or 4 described a kind of insulator leakage current detect systems, it is characterized in that: described signal amplifying apparatus also comprises the bias voltage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220333000 CN202794410U (en) | 2012-07-11 | 2012-07-11 | Monitoring system for leakage current of insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220333000 CN202794410U (en) | 2012-07-11 | 2012-07-11 | Monitoring system for leakage current of insulator |
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| CN202794410U true CN202794410U (en) | 2013-03-13 |
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| CN 201220333000 Expired - Fee Related CN202794410U (en) | 2012-07-11 | 2012-07-11 | Monitoring system for leakage current of insulator |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575972A (en) * | 2013-11-19 | 2014-02-12 | 国家电网公司 | Internal resistive current measurement system of electric transmission line insulator |
| CN103604976A (en) * | 2013-11-19 | 2014-02-26 | 国家电网公司 | Power transmission line insulator internal resistive current measuring method |
| CN103630731A (en) * | 2013-12-09 | 2014-03-12 | 广东电网公司电力科学研究院 | Leakage current sampling device and leakage current sampling method |
| CN103777064A (en) * | 2014-01-23 | 2014-05-07 | 国家电网公司 | Zinc oxide arrester live detection device free of external connection with alternating-current power supply |
| CN104764983A (en) * | 2015-03-18 | 2015-07-08 | 胡妍 | Insulator detection device |
| CN105137225A (en) * | 2015-07-31 | 2015-12-09 | 苏州宏展信息科技有限公司 | Electric leakage protector monitoring system based on voltage-stabilizing circuit |
| CN105891688A (en) * | 2016-04-12 | 2016-08-24 | 苏州寅泽缕弦电子技术有限公司 | Insulator detection device |
| CN106249115A (en) * | 2016-08-24 | 2016-12-21 | 古恒威 | The insulator detector that a kind of accuracy rate is high |
| CN106841810A (en) * | 2016-12-30 | 2017-06-13 | 易瓦特科技股份公司 | Insulator detector |
| CN108872696A (en) * | 2018-01-09 | 2018-11-23 | 国网山东省电力公司滨州供电公司 | A kind of leakage current circuit measuring high voltage iron tower tester |
-
2012
- 2012-07-11 CN CN 201220333000 patent/CN202794410U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575972A (en) * | 2013-11-19 | 2014-02-12 | 国家电网公司 | Internal resistive current measurement system of electric transmission line insulator |
| CN103604976A (en) * | 2013-11-19 | 2014-02-26 | 国家电网公司 | Power transmission line insulator internal resistive current measuring method |
| CN103604976B (en) * | 2013-11-19 | 2016-05-04 | 国家电网公司 | The inner current in resistance property measuring method of electric transmission line isolator |
| CN103575972B (en) * | 2013-11-19 | 2016-05-04 | 国家电网公司 | The inner current in resistance property measuring system of electric transmission line isolator |
| CN103630731A (en) * | 2013-12-09 | 2014-03-12 | 广东电网公司电力科学研究院 | Leakage current sampling device and leakage current sampling method |
| CN103777064A (en) * | 2014-01-23 | 2014-05-07 | 国家电网公司 | Zinc oxide arrester live detection device free of external connection with alternating-current power supply |
| CN104764983A (en) * | 2015-03-18 | 2015-07-08 | 胡妍 | Insulator detection device |
| CN105137225A (en) * | 2015-07-31 | 2015-12-09 | 苏州宏展信息科技有限公司 | Electric leakage protector monitoring system based on voltage-stabilizing circuit |
| CN105891688A (en) * | 2016-04-12 | 2016-08-24 | 苏州寅泽缕弦电子技术有限公司 | Insulator detection device |
| CN106249115A (en) * | 2016-08-24 | 2016-12-21 | 古恒威 | The insulator detector that a kind of accuracy rate is high |
| CN106841810A (en) * | 2016-12-30 | 2017-06-13 | 易瓦特科技股份公司 | Insulator detector |
| CN108872696A (en) * | 2018-01-09 | 2018-11-23 | 国网山东省电力公司滨州供电公司 | A kind of leakage current circuit measuring high voltage iron tower tester |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XINJIANG HONGSHENG GAOKE ELECTRICAL TECHNOLOGY DEV Free format text: FORMER OWNER: CHENGDU COPOO TECHNOLOGY CO., LTD. Effective date: 20130930 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 610000 CHENGDU, SICHUAN PROVINCE TO: 838600 KARAMAY, XINJIANG UYGUR AUTONOMOUS REGION |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130930 Address after: 838600, No. 8, Daqing East Road, Dushanzi District, the Xinjiang Uygur Autonomous Region, 9, Karamay Patentee after: Xinjiang Hongsheng tech Electric Technology Development Co Ltd Address before: 610000 8 South Street, Chengdu hi tech Development Zone, Sichuan, China Patentee before: Chengdu Cuopu Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20140711 |
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| EXPY | Termination of patent right or utility model |