CN101359017A - Detecting system for resistance current of passive lightning arrester - Google Patents
Detecting system for resistance current of passive lightning arrester Download PDFInfo
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- CN101359017A CN101359017A CNA2007100444394A CN200710044439A CN101359017A CN 101359017 A CN101359017 A CN 101359017A CN A2007100444394 A CNA2007100444394 A CN A2007100444394A CN 200710044439 A CN200710044439 A CN 200710044439A CN 101359017 A CN101359017 A CN 101359017A
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- lightning arrester
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Abstract
The present invention discloses a detection system of the resistive current of the passive arrester, and comprises an arrester body, a metal flange and a detection device; the metal flange and the detection device are arranged at the lower end of the arrester body and are connected with the inner core of the arrester; and the detection device is connected in series between the metal flange and the ground in the way of passive power supply. The detection device comprises a leakage sensor which is directly connected with the inner core of the arrester, a differential operational amplifier with the input end connected with the output end of the leakage sensor, an A/D converter with the input end connected with the output end of the operational amplifier, and a measuring, calculating and controlling chip with the input end connected with the output end of the A/D converter. The detection system of the resistive current of the passive arrester can accurately detect the total leakage current, accurately calculate the resistive leakage current, and effectively detect the internal quality changes of the arrester.
Description
Technical field
The present invention relates to a kind of detection system of resistance current of passive lightning arrester.
Background technology
Zinc-Oxide Arrester is a kind of protection equipment that the protection electric equipment is avoided the superpotential infringement.Because nonlinear characteristic that Zinc-Oxide Arrester is superior and good through-current capability; now accepted and be extensive use of by the user of vast power department; yet a large amount of uses along with Zinc-Oxide Arrester; cause protected equipment to be damaged and cause that electric power accident happens occasionally because of lightning arrester itself has an accident, especially in a single day 110KV and above electric pressure Zinc-Oxide Arrester have an accident and will bring about great losses to the user.
Be at lightning arrester that resistive current component is far smaller than capacitive component under the normal working voltage state, general resistive leakage current component accounts for the numerical value that circuital ratio can not surpass 10-15%, even so resistive component doubles, circuital variation can not surpass 5.0%.Only detect total current, just can not effectively monitor the trend of the internal performance deterioration of lightning arrester.It is also little that current in resistance property increases the amplitude that total current is increased, and total current can not fast, correctly be found the mass change of lightning arrester inside, detects the mass change that current in resistance property could reflect Zinc-Oxide Arrester inside effectively, reliably.
Therefore the Performance Detection to lightning arrester is an important content under working voltage.Though taked the multiple technologies measure for many years, owing to the reason of detection method has caused detection weak effect, pick-up unit cost height, poor reliability.There is following problem in domestic and international employed pick-up unit at present:
1. lack the online detection means of effective high pressure, particularly lack effectively detection means automatically.
2. present lightning arrester leaks monitoring arrangement can accurately in time not make judgement to the fault of lightning arrester, (general at present the employing measured total current, and what really reflect its fault is current in resistance property).
3. owing to lack the method for passive detection and the detection of no-voltage reference quantity, can't form the product of high cost performance.
Summary of the invention
The objective of the invention is to solve the problems referred to above that prior art exists, provide a kind of and can accurately detect the leakage total current, and can accurately calculate the detection system of the resistance current of passive lightning arrester of resistive leakage current.
The objective of the invention is to be achieved: a kind of detection system of resistance current of passive lightning arrester by following technical scheme, the metal flange and the pick-up unit that comprise lightning arrester body, be installed in the lightning arrester body lower end and be connected with the inner core body of lightning arrester, described pick-up unit is connected between metal flange and the ground with passive power supply mode.
The detection system of above-mentioned resistance current of passive lightning arrester, wherein, described pick-up unit comprises the leak sensor that directly is connected with the inner core body of lightning arrester, the difference transport and placing device that input end is connected with the leak sensor output terminal, the A/D converter that input end is connected with difference transport and placing device output terminal, measurement, calculating and the control chip that input end is connected with the A/D converter output terminal, wherein:
Leak sensor is used to obtain the leakage full current signal that flows through lightning arrester body under working voltage;
The difference transport and placing device is used to amplify the leakage full current signal of leak sensor output;
A/D converter is used for the leakage full current signal that the difference transport and placing device amplifies is carried out mould/number conversion;
Measurement, calculating and control chip are used for and will distinguish and calculate resistive leakage current through the leakage full current signal of A/D converter conversion.
The detection system of above-mentioned resistance current of passive lightning arrester, wherein, described pick-up unit also comprises liquid crystal display and/or the wireless communication apparatus that is connected with measurement, calculating and control chip output terminal, is used for total current, resistive leakage current and lightning discharge number of times that measurement, calculating and control chip are calculated and transmits to the external world by liquid crystal display and/or in the mode of wireless telecommunications.
The detection system of above-mentioned resistance current of passive lightning arrester, wherein, the passive power supply mode of described pick-up unit is a powered battery, regularly the startup sampling is powered and regularly closed the instrument power supply, when the lightning discharge electric current, the employing counting is powered.
The detection system of above-mentioned resistance current of passive lightning arrester, wherein, the bottom that contacts with ground of described lightning arrester body is provided with insulating part, the bottom of described lightning arrester body outer peripheral face is nested with the shading ring of a ground connection, is used to collect the leakage current on lightning arrester body surface and leakage current that should the surface and introduces underground.
The detection system of above-mentioned resistance current of passive lightning arrester, wherein, described pick-up unit is encapsulated in the housing by integrated.
Adopted the detection system of resistance current of passive lightning arrester of the present invention, can accurately detect the leakage total current, and can accurately calculate resistive leakage current, the internal soundness that has effectively detected lightning arrester changes.Again, be provided with insulating part in the bottom of lightning arrester and be provided with and be used to collect the leakage current on lightning arrester surface and the shading ring of ground connection, can guarantee the authenticity of current detecting in the bottom of lightning arrester.In addition pick-up unit is encapsulated in a protection against the tide, dustproof reaching in the high shell of the class of insulation, reaches open-air request for utilization fully.
Description of drawings
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing:
Fig. 1 is the structural representation of the detection system of resistance current of passive lightning arrester of the present invention;
Fig. 2 is the structured flowchart of the pick-up unit in the detection system of resistance current of passive lightning arrester of the present invention.
Embodiment
See also Fig. 1 and Fig. 2, the detection system of resistance current of passive lightning arrester of the present invention, the metal flange 2 and the pick-up unit 3 that comprise lightning arrester body 1, be installed in lightning arrester body 1 lower end and be connected with the inner core body 10 of lightning arrester, wherein, the bottom that contacts with ground of lightning arrester body 1 is provided with insulating part 4, the bottom of lightning arrester body 1 outer peripheral face is nested with the shading ring 11 of a ground connection, is used to collect the leakage current on lightning arrester body 1 surface and leakage current that should the surface and introduces underground 5.
Pick-up unit 3 comprises leak sensor 31, difference transport and placing device 32, A/D converter 33, measurement, calculating and control chip 34 and liquid crystal display and/or wireless communication apparatus 35, wherein, leak sensor 31 directly is connected with the inner core body 10 of lightning arrester, is used to obtain the leakage full current signal that flows through lightning arrester body 1 under working voltage; The input end of difference transport and placing device 32 is connected with the output terminal of leak sensor 31, is used to amplify the leakage full current signal of leak sensor 31 outputs; The resolution of A/D converter 33 is not less than 12, and its input end is connected with the output terminal of difference transport and placing device 32, is used for the leakage full current signal that difference transport and placing device 32 amplifies is carried out mould/number conversion; The input end of measurement, calculating and control chip 34 is connected with the output terminal of A/D converter 33, is used for distinguishing and to calculate resistive leakage current through the leakage full current signal of A/D converter 33 conversions; Liquid crystal display and/or wireless communication apparatus 35 are connected with measurement, calculating and the output terminal of control chip 34, are used for total current, resistive leakage current and lightning discharge number of times that measurement, calculating and control chip 34 are calculated and transmit to the external world by liquid crystal display and/or in the mode of wireless telecommunications.
Pick-up unit 3 is connected between metal flange 2 and the ground by integrated being encapsulated in the housing and with passive power supply mode.The passive power supply mode of pick-up unit 3 is powered battery, regularly starts sampling power supply or regularly stopping device power supply, when the lightning discharge electric current, adopts the counting power supply.
The principle of work of the detection system of resistance current of passive lightning arrester of the present invention:
The detected object of pick-up unit 3 is that the leakage total current that flows through lightning arrester under working voltage has comprised resistive leakage current component, capacitive leakage current component two parts.Difference transport and placing device 32 in the pick-up unit 3 amplifies the full current signal of leak sensor 31 outputs, uses the A/D converter 33 that is not less than 12 bit resolutions to carry out data-switching.
Leak the calculating of current in resistance property, the calculating of leaking current in resistance property need be distinguished current in resistance property from total current.Pick-up unit 3 has adopted three kinds of computing method of no-voltage reference quantity.The controller that measurement, calculating, control chip 34 are adopted can be single-chip microcomputer, DSP or ARM chip.
Pick-up unit 3 provides information in the mode of liquid crystal display or wireless telecommunications to the external world, and the information content is no less than following three: total current, current in resistance property and lightning discharge number of times.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, the present invention can also change and more mode, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (6)
1, a kind of detection system of resistance current of passive lightning arrester, the metal flange and the pick-up unit that comprise lightning arrester body, be installed in the lightning arrester body lower end and be connected with the inner core body of lightning arrester, it is characterized in that described pick-up unit is connected between metal flange and the ground with passive power supply mode.
2, the detection system of resistance current of passive lightning arrester according to claim 1, it is characterized in that, described pick-up unit comprises the leak sensor that directly is connected with the inner core body of lightning arrester, the difference transport and placing device that input end is connected with the leak sensor output terminal, the A/D converter that input end is connected with difference transport and placing device output terminal, measurement, calculating and the control chip that input end is connected with the A/D converter output terminal, wherein:
Leak sensor is used to obtain the leakage full current signal that flows through lightning arrester body under working voltage;
The difference transport and placing device is used to amplify the leakage full current signal of leak sensor output;
A/D converter is used for the leakage full current signal that the difference transport and placing device amplifies is carried out mould/number conversion;
Measurement, calculating and control chip are used for and will distinguish and calculate resistive leakage current through the leakage full current signal of A/D converter conversion.
3, the detection system of resistance current of passive lightning arrester according to claim 1 and 2, it is characterized in that, described pick-up unit also comprises liquid crystal display and/or the wireless communication apparatus that is connected with measurement, calculating and control chip output terminal, is used for total current, resistive leakage current and lightning discharge number of times that measurement, calculating and control chip are calculated and transmits to the external world by liquid crystal display and/or in the mode of wireless telecommunications.
4, the detection system of resistance current of passive lightning arrester according to claim 1, it is characterized in that, the passive power supply mode of described pick-up unit is a powered battery, regularly the startup sampling is powered and regularly closed the instrument power supply, and when the lightning discharge electric current, the employing counting is powered.
5, the detection system of resistance current of passive lightning arrester according to claim 1, it is characterized in that, the bottom that contacts with ground of described lightning arrester body is provided with insulating part, the bottom of described lightning arrester body outer peripheral face is nested with the shading ring of a ground connection, is used to collect the leakage current on lightning arrester body surface and leakage current that should the surface and introduces underground.
6, the detection system of resistance current of passive lightning arrester according to claim 1 is characterized in that, described pick-up unit is encapsulated in the housing by integrated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100444394A CN101359017A (en) | 2007-07-31 | 2007-07-31 | Detecting system for resistance current of passive lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100444394A CN101359017A (en) | 2007-07-31 | 2007-07-31 | Detecting system for resistance current of passive lightning arrester |
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| CN101359017A true CN101359017A (en) | 2009-02-04 |
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| CNA2007100444394A Pending CN101359017A (en) | 2007-07-31 | 2007-07-31 | Detecting system for resistance current of passive lightning arrester |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692581A (en) * | 2012-06-19 | 2012-09-26 | 国电大渡河检修安装有限公司 | Current leakage test method for lightning arrestor |
| CN102944738A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Detection system and detection method for leakage current of switchgear arrester |
| CN103353542A (en) * | 2013-06-24 | 2013-10-16 | 国家电网公司 | Lead wire clamp for simultaneous detection of three phases of lightning arrester |
| CN104133087A (en) * | 2014-08-22 | 2014-11-05 | 株洲普天中普防雷科技有限公司 | Method and device for antenna feeder surge protective device auxiliary testing |
| CN105738787A (en) * | 2016-04-19 | 2016-07-06 | 国网辽宁省电力有限公司鞍山供电公司 | Insulated breakdown passive alarming and monitoring device for 10-kv lightning arrester |
| CN112630569A (en) * | 2020-12-14 | 2021-04-09 | 广东电网有限责任公司韶关供电局 | Arrester on-line monitoring device and system |
-
2007
- 2007-07-31 CN CNA2007100444394A patent/CN101359017A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692581A (en) * | 2012-06-19 | 2012-09-26 | 国电大渡河检修安装有限公司 | Current leakage test method for lightning arrestor |
| CN102944738A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Detection system and detection method for leakage current of switchgear arrester |
| CN103353542A (en) * | 2013-06-24 | 2013-10-16 | 国家电网公司 | Lead wire clamp for simultaneous detection of three phases of lightning arrester |
| CN104133087A (en) * | 2014-08-22 | 2014-11-05 | 株洲普天中普防雷科技有限公司 | Method and device for antenna feeder surge protective device auxiliary testing |
| CN104133087B (en) * | 2014-08-22 | 2017-04-05 | 湖南中普技术股份有限公司 | For the method and device of antenna feeder Surge Protector subtest |
| CN105738787A (en) * | 2016-04-19 | 2016-07-06 | 国网辽宁省电力有限公司鞍山供电公司 | Insulated breakdown passive alarming and monitoring device for 10-kv lightning arrester |
| CN112630569A (en) * | 2020-12-14 | 2021-04-09 | 广东电网有限责任公司韶关供电局 | Arrester on-line monitoring device and system |
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Open date: 20090204 |