CN102169164A - Method for detecting burning loss condition of arcing contact of high-voltage breaker - Google Patents
Method for detecting burning loss condition of arcing contact of high-voltage breaker Download PDFInfo
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- CN102169164A CN102169164A CN2011100435527A CN201110043552A CN102169164A CN 102169164 A CN102169164 A CN 102169164A CN 2011100435527 A CN2011100435527 A CN 2011100435527A CN 201110043552 A CN201110043552 A CN 201110043552A CN 102169164 A CN102169164 A CN 102169164A
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Abstract
The invention relates to a method for detecting burning loss condition of an arcing contact of a high-voltage breaker. The method is characterized in that input and output ends of a high-voltage breaker are respectively provided with a voltage detecting node, the voltage detecting nodes are respectively connected with a dynamic resistance tester through a voltage test line, the dynamic resistance tester comprises a central processing unit which is connected with a display device. The method comprises the following steps of: establishing a coordinate system to obtain voltage and current; finding two mutation points of a voltage curve and a current curve when main contact separation and arching contact separation happen; calculating the time difference between the two mutation points, and further calculating the burning loss of an arcing contact. The method provided by the invention can be used for detecting the burning loss condition of the arcing contact of the high-voltage breaker in real time and is convenient, visual and reliable to use.
Description
Technical field
The present invention relates to a kind of detection method of primary cut-out, especially relate to a kind of method of primary cut-out arcing contact scaling loss situation.
Background technology
Primary cut-out is one of important electrical equipment; it not only can cut-off no-load current and load current with the closed high circuit; and when system breaks down; it and protective device, aut.eq. match; promptly excise fault current; to reduce the power failure scope, the accident that prevents enlarges, and guarantees system safety operation.
The contact of primary cut-out comprises main contact and arcing contact.Generally speaking, main contact adopts the silver-plated material of copper, and resistance is very little, and arcing contact adopts the material of tungalloy, and compare resistance with main contact bigger, but it is high temperature resistant.In the operational process, primary cut-out is in "on" position, main contact and arcing contact parallel connection, because the resistance of main contact is far smaller than the resistance of arcing contact, so electric current mainly flows through by main contact.When the primary cut-out separating brake was operated, main contact at first separated, through after a while after (several millisecond), arcing contact separates again, and during this period of time, electric current is transferred on the arcing contact from main contact, utilize the resistance to elevated temperatures of arcing contact, by arcing contact through arcing, breath arc process, breaking current.
The scaling loss that primary cut-out can cause arcing contact to be made during dropout current repeatedly, confirm by correlation test, only judge arcing contact scaling loss situation with the accumulative total dropout current of primary cut-out, and calculate the residual life of isolating switch and unreliable by its life curve, all there are not the research and the discussion of this project at present at practice and various document.Therefore need study a kind of method that can accurately reflect primary cut-out arcing contact scaling loss situation.
Summary of the invention
The present invention solves the technical matters that existing in prior technology primary cut-out arcing contact scaling loss situation can only be calculated the residual life of isolating switch by life curve, a kind of scaling loss situation that can detect the arcing contact of primary cut-out immediately is provided, and method easy to use, directly perceived, reliable.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of method that detects primary cut-out arcing contact scaling loss situation, it is characterized in that: input, output terminal at primary cut-out are respectively equipped with the voltage detecting node, this voltage detecting node links to each other with a Dynamic Resistance Tester by the voltage tester line respectively, this Dynamic Resistance Tester comprises a CPU (central processing unit), this CPU (central processing unit) links to each other with a display device, and the testing procedure of primary cut-out arcing contact scaling loss situation is:
1. set up coordinate system in the system of Dynamic Resistance Tester, ordinate is represented voltage, electric current, the horizontal ordinate express time, and be presented on the display device;
2. after primary cut-out being closed a floodgate, give its two ends logical direct current;
3. primary cut-out is carried out sub-switching operation, in the separating brake process, system makes current curve, voltage curve respectively in coordinate system;
4. in primary cut-out separating brake process, before main contact did not separate, main contact was taken electric loop as the leading factor; After main contact separated, arcing contact was taken electric loop as the leading factor; And after arcing contact separates, the just complete separating brake of primary cut-out, galvanic circle resistance is infinitely great, because in this process mesohigh isolating switch galvanic circle changes in resistance, obtain the voltage curve at its two ends in the separating brake process, two catastrophe points are arranged on the voltage curve, these two catastrophe points have been represented primary cut-out main contact separated point and arcing contact separated point respectively, and calculate mistiming of these two catastrophe points, and the main separated point that touches is the starting point of arcing contact;
5. the mistiming of the translational speed of arcing contact be multiply by above-mentioned two catastrophe points is arcing contact at the main contact arcing contact movable length L of back when arcing contact separates separately, and according to the scaling loss situation of this movable length L judgement arcing contact.
Though main contact begins when mobile, arcing contact also begins to move, because the time point that main contact begins to move is difficult to catch, if begin simultaneously to carry out timing when mobile from main contact and arcing contact, and calculates the total length of arcing contact, obviously has difficulty.And after the effect of arcing contact was mainly reflected in the main contact separation, therefore, after the present invention adopted and calculates the main contact separation, the movable length of arcing contact was judged the scaling loss situation of arcing contact.
As preferably, in the separating brake process, instant resistance value is calculated by instant electric current and instant electric current immediately by system in coordinate, and sets up the resistance variations curve.Because the scaling loss situation of arcing contact is not fully to carrying out to the tail order, the situation that the middle part scaling loss also may occur, when in the separating brake process, except above-mentioned two catastrophe points, the resistance variations curve also occurring sharply changes, prove that promptly the problem of middle part scaling loss appears in arcing contact, in the case, also must overhaul it.
As preferably, described Dynamic Resistance Tester is provided with the DC test power supply.The DC test power supply is a necessary key element of the present invention, and this programme is located at the DC test power supply on the Dynamic Resistance Tester, has made things convenient for its operation, has also improved testing efficiency.
The beneficial effect that brings of the present invention is, solved existing in prior technology primary cut-out arcing contact scaling loss situation and can only calculate the technical matters of the residual life of isolating switch by life curve, realized a kind of scaling loss situation that can detect the arcing contact of primary cut-out immediately, and method easy to use, directly perceived, reliable.
Description of drawings
Accompanying drawing 1 is a kind of schematic diagram of the present invention;
Accompanying drawing 2 is separating brake conditional curve figure of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1, the present invention is a kind of method that detects primary cut-out arcing contact scaling loss situation, input, output terminal at primary cut-out are respectively equipped with the voltage detecting node, this voltage detecting node links to each other with a Dynamic Resistance Tester by the voltage tester line respectively, this Dynamic Resistance Tester comprises a DC test power supply, a CPU (central processing unit), this CPU (central processing unit) links to each other with a display device, and the testing procedure of primary cut-out arcing contact scaling loss situation is:
1. as shown in Figure 2, set up coordinate system in the system of Dynamic Resistance Tester, ordinate is represented voltage, electric current and resistance value, the horizontal ordinate express time, and be presented on the display device;
2. after primary cut-out being closed a floodgate, give its two ends logical direct current;
3. primary cut-out is carried out sub-switching operation, in the separating brake process, system makes current curve 3, voltage curve 2 and resistance variations curve 1 respectively in coordinate system;
4. in primary cut-out separating brake process, before main contact did not separate, main contact was taken electric loop as the leading factor; After main contact separated, arcing contact was taken electric loop as the leading factor; And after arcing contact separates, the just complete separating brake of primary cut-out, galvanic circle resistance is infinitely great, because in this process mesohigh isolating switch galvanic circle changes in resistance, obtain the voltage curve at its two ends in the separating brake process, two catastrophe points are arranged on the voltage curve, these two catastrophe points have been represented primary cut-out main contact separated point and arcing contact separated point respectively, and calculate mistiming of these two catastrophe points, and the main separated point that touches is the starting point of arcing contact, because the scaling loss situation of arcing contact is not fully to carrying out to the tail order, the situation of middle part scaling loss also may occur, when in the separating brake process, except above-mentioned two catastrophe points, the resistance variations curve also occurs and sharply change, prove that promptly the problem of middle part scaling loss appears in arcing contact, in the case, also must overhaul it;
5. the mistiming of the translational speed of arcing contact be multiply by above-mentioned two catastrophe points is arcing contact at the main contact arcing contact movable length L of back when arcing contact separates separately, and according to the scaling loss situation of this movable length L judgement arcing contact.
So the present invention has convenience, directly perceived, reliable, in time react the scaling loss situation of arcing contact.
Claims (3)
1. method that detects primary cut-out arcing contact scaling loss situation, it is characterized in that: input, output terminal at primary cut-out are respectively equipped with the voltage detecting node, this voltage detecting node links to each other with a Dynamic Resistance Tester by the voltage tester line respectively, this Dynamic Resistance Tester comprises a CPU (central processing unit), this CPU (central processing unit) links to each other with a display device, and the testing procedure of primary cut-out arcing contact scaling loss situation is:
A. set up coordinate system in the system of Dynamic Resistance Tester, ordinate is represented voltage, electric current, the horizontal ordinate express time, and be presented on the display device;
B. after primary cut-out being closed a floodgate, give its two ends logical direct current;
C. primary cut-out is carried out sub-switching operation, in the separating brake process, system makes current curve (3), voltage curve (2) respectively in coordinate system;
D. in primary cut-out separating brake process, before main contact did not separate, main contact was taken electric loop as the leading factor; After main contact separated, arcing contact was taken electric loop as the leading factor; And after arcing contact separates, the just complete separating brake of primary cut-out, galvanic circle resistance is infinitely great, because in this process mesohigh isolating switch galvanic circle changes in resistance, obtain the voltage curve at its two ends in the separating brake process, two catastrophe points are arranged on the voltage curve, these two catastrophe points have been represented primary cut-out main contact separated point and arcing contact separated point respectively, and calculate mistiming of these two catastrophe points, and the main separated point that touches is the starting point of arcing contact;
The mistiming of E. translational speed of arcing contact be multiply by above-mentioned two catastrophe points is arcing contact at the main contact arcing contact movable length L of back when arcing contact separates separately, and according to the scaling loss situation of this movable length L judgement arcing contact.
2. the method for detection primary cut-out arcing contact scaling loss situation according to claim 1 is characterized in that, in the separating brake process, instant resistance value is calculated by instant electric current and instant electric current immediately by system in coordinate, and sets up resistance variations curve (1).
3. the method for detection primary cut-out arcing contact scaling loss situation according to claim 1 and 2 is characterized in that described Dynamic Resistance Tester is provided with the DC test power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100435527A CN102169164A (en) | 2011-02-23 | 2011-02-23 | Method for detecting burning loss condition of arcing contact of high-voltage breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100435527A CN102169164A (en) | 2011-02-23 | 2011-02-23 | Method for detecting burning loss condition of arcing contact of high-voltage breaker |
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| CN102169164A true CN102169164A (en) | 2011-08-31 |
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| CN2011100435527A Pending CN102169164A (en) | 2011-02-23 | 2011-02-23 | Method for detecting burning loss condition of arcing contact of high-voltage breaker |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237783A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Burning loss simulation test circuit device for high-voltage circuit-breaker contacts |
| CN106019139A (en) * | 2016-07-28 | 2016-10-12 | 山东泰开高压开关有限公司 | Arc-extinguishing chamber arc contact ablation degree measurement device and measurement method |
| CN104198928B (en) * | 2014-07-11 | 2017-02-15 | 清华大学 | Circuit breaker contact ablation degree measuring method |
| CN108490348A (en) * | 2018-05-25 | 2018-09-04 | 广东电网有限责任公司 | Method, device and system for testing performance of circuit breaker with double ground knives |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1645534A (en) * | 2004-01-15 | 2005-07-27 | Abb技术有限公司 | Method for inspecting a circuit breaker |
| CN1976147A (en) * | 2005-11-30 | 2007-06-06 | Abb技术有限公司 | Monitoring system for high-voltage switch gears |
| CN2916648Y (en) * | 2006-01-16 | 2007-06-27 | 天津海飞特电源科技有限公司 | Portable DC circuit breaker characteristic testing device |
| CN101515781A (en) * | 2009-03-31 | 2009-08-26 | 沈阳工业大学 | Universal servocontrol platform device for motor-operating mechanism of high-voltage switch apparatus and method |
-
2011
- 2011-02-23 CN CN2011100435527A patent/CN102169164A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645534A (en) * | 2004-01-15 | 2005-07-27 | Abb技术有限公司 | Method for inspecting a circuit breaker |
| CN1976147A (en) * | 2005-11-30 | 2007-06-06 | Abb技术有限公司 | Monitoring system for high-voltage switch gears |
| CN2916648Y (en) * | 2006-01-16 | 2007-06-27 | 天津海飞特电源科技有限公司 | Portable DC circuit breaker characteristic testing device |
| CN101515781A (en) * | 2009-03-31 | 2009-08-26 | 沈阳工业大学 | Universal servocontrol platform device for motor-operating mechanism of high-voltage switch apparatus and method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198928B (en) * | 2014-07-11 | 2017-02-15 | 清华大学 | Circuit breaker contact ablation degree measuring method |
| CN104237783A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Burning loss simulation test circuit device for high-voltage circuit-breaker contacts |
| CN104237783B (en) * | 2014-09-26 | 2017-06-06 | 国家电网公司 | A kind of High Voltage Circuit Breaker Contacts simulate burn-out test loop apparatus |
| CN106019139A (en) * | 2016-07-28 | 2016-10-12 | 山东泰开高压开关有限公司 | Arc-extinguishing chamber arc contact ablation degree measurement device and measurement method |
| CN108490348A (en) * | 2018-05-25 | 2018-09-04 | 广东电网有限责任公司 | Method, device and system for testing performance of circuit breaker with double ground knives |
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Application publication date: 20110831 |