CN101685114A - Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence - Google Patents
Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence Download PDFInfo
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- CN101685114A CN101685114A CN200810200468A CN200810200468A CN101685114A CN 101685114 A CN101685114 A CN 101685114A CN 200810200468 A CN200810200468 A CN 200810200468A CN 200810200468 A CN200810200468 A CN 200810200468A CN 101685114 A CN101685114 A CN 101685114A
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- disconnector
- grounding switch
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Abstract
The invention discloses a measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence. The method comprises the following steps: in the first outlet circuit of a circuit breaker, separately turning off a first isolating switch, a second isolating switch and a second earthing switch, switching on a first earthing switch, a third isolating switch and a circuit earth side switch, simultaneously dismantling the logic blocking device between the earthing switches and isolating switches and the earthing connecting bar of R, S and T of the circuit earth side switch, and connecting the connection end of R, S and T of the circuit earth side switch with a loop resistance tester used for measuring the contact resistance of each phase of the circuit breaker. The methodof the invention can be used to effectively, fast and accurately measure the contact resistance of the circuit breaker without disintegrating the circuit breaker; the measurement method uses movable and fixed contacts of each phase of the circuit breaker to form contact resistance for measuring each contacts in the measurement loop so as to avoid the original defect of separately measuring movableand fixed contacts of each phase of the circuit breaker.
Description
Technical field
The present invention relates to the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of a kind of GIS.
Background technology
The totally-enclosed 126KV combination circuit breaker of GIS is exclusively used in for distribution power system, always falls in station, the many high-current electrical equipments of electric substation, all needs accurately to measure the resistance value of isolating switch galvanic circle in the preventive trial of isolating switch and commissioning test.Electric system at present is newly-built all to adopt these equipment with transformation, the current developing direction of totally-enclosed GIS combination S F6 switch representative.Switch uses frequently generally in 1 to 3 year measuring period, and the measurement of its contact resistance need be shortened measuring period.
Unit such as the totally-enclosed combined switch collection of GIS isolating switch, disconnector, grounding switch, mutual inductor, lightning arrester, bus, web member, the metal shell shell that is enclosed in a ground connection is formed.Its inside is filled with certain pressure and the SF6 gas of excellent arc extinguishing and insulating capacity is arranged.The GIS switch had not only sealed but also had made up outstanding advantage, the floor area of device and spatial volume, and structure is very compact; Totally enclosed electrical structure is not subjected to the influence of various abominable natural conditions such as rain thunder, dirt sand and salt fog, has reduced the possibility of equipment breakdown, is particularly suitable for industrial pollution and awful weather and high altitude localities;
The resistance of isolating switch galvanic circle depends primarily on the contact resistance between the dynamic and static contact of isolating switch.The existence of contact resistance, increased the loss of conductor when energising, the temperature of contact position is raise, current capacity when the size of its value directly influences operate as normal, influence the cut-out ability of short-circuit current to a certain extent, probably owing to galvanic circle a certain junction loose contact, the local temperature rise of loose contact place increases when big electric current moves, when serious even cause that vicious cycle causes oxidization burning loss, need double especially to note to the isolating switch that is used for big electric current operation.
Usually adopted direct-flow double bridge to measure the contact resistance of isolating switch in the past.Because what double bridge measurement loop was passed through is faint electric current, is difficult to eliminate the bigger oxide film of resistance, so the resistance value of measuring is bigger than normal.Loop resistance measurement does not allow to adopt bridge measurement, must adopt the direct current pressure decline method of regulation.When adopting the test of direct current pressure decline method, electric current also must not be too little.Oxide film is easy to breakdownly under big electric current between the dynamic and static contact of isolating switch, does not hinder normal current to pass through.Native land man's standard and power industry standard have all been made regulation to the measurement of isolating switch galvanic circle resistance: electric current must not should adopt the direct current pressure decline method to measure less than 100A.Therefore, the every phase of isolating switch galvanic circle resistance value is a ten minutes significant data of isolating switch installation, maintenance and inspection of quality.
The measurement of the contact resistance of isolating switch galvanic circle has many kinds of methods.The foreign scholar had once proposed to measure contact resistance with the superconduction quantum device; Proposed to utilize the electrolysis channel process to measure contact resistance; Proposed to measure contact resistance, but these methods generally only are to electrically contact the method that research institute adopts under laboratory condition with the third harmonic method.At present,, adopt four-terminal method, i.e. a contact resistance of measuring breaker contact point mutually mutually in major loop at home usually at the dynamic and static contact two ends of isolating switch.
At present to the measurement of totally-enclosed GIS combination S F6 circuit breaker contact persistence also not effectively, fast, the measurement of measurement means, and circuit breaker contact persistence accurately generally installing or the overhaul structure is carried out when disintegrating, be difficult at ordinary times measure.
Summary of the invention
Technical matters to be solved by this invention provides the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of a kind of GIS, utilizes this method can measure the isolating switch resistance that respectively contacts effectively, fast, accurately, and need not structure disintegration isolating switch.
For solving the problems of the technologies described above, in the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of GIS of the present invention, described isolating switch is formed an outlet by following mode, it comprises I section bus, II section bus, first disconnector, second disconnector, the 3rd disconnector, first grounding switch, second grounding switch, line side grounding switch summation current transformer, described first disconnector is connected described I section bus and II section bus respectively with second disconnector, one end, the other end of described first disconnector and second disconnector is connected described isolating switch one end and first grounding switch, one end respectively, the other end ground connection of described first grounding switch, be provided with the logic blocking device between described first grounding switch and described first disconnector and second disconnector, the other end of described isolating switch connects described current transformer one end, the other end of described current transformer connects an end of described the 3rd disconnector and an end of second grounding switch respectively, the other end ground connection of described second grounding switch, the other end difference stube cable output terminal of described the 3rd disconnector and an end of line side grounding switch, the other end ground connection of described line side grounding switch, this measuring method comprises the steps:
Step 1, at first disconnect described isolating switch, and disconnect described first disconnector and second disconnector, remove the logic blocking device between described first grounding switch and described first disconnector and second disconnector, and described first grounding switch combined floodgate is made described isolating switch reliable ground;
Step 2, described second grounding switch of disconnection, described the 3rd disconnector and line side grounding switch close a floodgate, remove the logic blocking device of described second grounding switch and described the 3rd disconnector, the ground connection of removing described line side grounding switch R, S, T end connects row;
Because it is exactly scheme that the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of GIS of the present invention has adopted above-mentioned, promptly in outgoing line circuit of isolating switch, disconnect first disconnector respectively, second disconnector and second grounding switch, first grounding switch closes a floodgate, the 3rd disconnector and line side grounding switch, remove the logic blocking device between grounding switch and the disconnector and the R of line side grounding switch simultaneously, S, the ground connection of T connects row, on this circuit base at the R of line side grounding switch, S, the link link circuit resistance meter of T is measured the contact resistance value of each phase of isolating switch; Utilize this method can measure circuit breaker contact persistence effectively, fast, accurately, and need not structure disintegration isolating switch, this measuring method is each mutually dynamic and static contact of isolating switch to be formed in measure the contact resistance of measuring each contact in the loop, has avoided the defective of each mutually dynamic and static contact independent measurement of former isolating switch.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is the synoptic diagram of an outgoing line circuit of isolating switch among the present invention,
Fig. 2 is the metering circuit figure of measuring method of the present invention.
Embodiment
As depicted in figs. 1 and 2, in the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of GIS of the present invention, described isolating switch 6 is formed an outlet by following mode, it comprises I section bus 1, II section bus 2, first disconnector 3, second disconnector 4, the 3rd disconnector 7, first grounding switch 5, second grounding switch 8, line side grounding switch 9 summation current transformers 11, described first disconnector 3 is connected described I section bus 1 and II section bus 2 respectively with second disconnector, 4 one ends, the other end of described first disconnector 3 and second disconnector 4 is connected described isolating switch 6 one ends and first grounding switch, 5 one ends respectively, the other end ground connection of described first grounding switch 5, be provided with the logic blocking device between described first grounding switch 5 and described first disconnector 3 and second disconnector 4, the other end of described isolating switch 6 connects described current transformer 11 1 ends, the other end of described current transformer 11 connects an end of described the 3rd disconnector 7 and an end of second grounding switch 8 respectively, the other end ground connection of described second grounding switch 8, the other end difference stube cable output terminal 10 of described the 3rd disconnector 7 and an end of line side grounding switch 9, the other end ground connection of described line side grounding switch 9, this measuring method comprises the steps:
Step 1, at first disconnect described isolating switch 6, and disconnect described first disconnector 3 and second disconnector 4, remove the logic blocking device between described first grounding switch 5 and described first disconnector 3 and second disconnector 4, and described first grounding switch, 5 combined floodgates are made described isolating switch 6 reliable grounds;
Step 2, described second grounding switch 8 of disconnection, described the 3rd disconnector 7 and line side grounding switch 9 close a floodgate, remove the logic blocking device of described second grounding switch 8 and described the 3rd disconnector 7, R, S, the T end ground connection of removing described line side grounding switch 9 connect row, and described R, S, T end promptly are respectively A phase in the major loop, B phase and C mutually;
The measurement range of above-mentioned circuit resistance tester is 1-1999 μ Ω, and resolution is 1 μ Ω; The measurement electric current is 600A, and measuring accuracy is 0.5 grade.
The measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of GIS of the present invention, promptly in outgoing line circuit of isolating switch, disconnect first disconnector, second disconnector and second grounding switch respectively, first grounding switch, the 3rd disconnector and line side grounding switch close a floodgate, remove grounding switch simultaneously and be connected row, on this circuit base, measure the contact resistance value of each phase of isolating switch at R, the S of line side grounding switch, the link link circuit resistance meter of T with logic blocking device and R, the S of line side grounding switch, the ground connection of T between the disconnector; Utilize this method can under the condition that bus does not have a power failure, measure circuit breaker contact persistence effectively, fast, accurately, and need not structure disintegration isolating switch, this measuring method is each mutually dynamic and static contact of isolating switch to be formed in measure the contact resistance of measuring each contact in the loop, has avoided the defective of each mutually dynamic and static contact independent measurement of former isolating switch.
By former measuring method, when the totally-enclosed 126KV combined circuit breaker contact persistence of GIS is measured, need the disintegration isolating switch, and need system all have a power failure, about week age consuming time, the various losses that cause thus are very big.
And after utilizing this measuring method, the totally-enclosed 126KV combined circuit breaker contact persistence of one group of GIS of general measure needed only 4-8 hour, and is very simple and convenient, and carries out under the situation that double-bus does not have a power failure, and its beneficial effect has obtained showing especially.
Claims (1)
1, the measuring method of the totally-enclosed 126KV combined circuit breaker contact persistence of a kind of GIS, described isolating switch is formed an outlet by following mode, it comprises I section bus, II section bus, first disconnector, second disconnector, the 3rd disconnector, first grounding switch, second grounding switch, line side grounding switch summation current transformer, described first disconnector is connected described I section bus and II section bus respectively with second disconnector, one end, the other end of described first disconnector and second disconnector is connected described isolating switch one end and first grounding switch, one end respectively, the other end ground connection of described first grounding switch, be provided with the logic blocking device between described first grounding switch and described first disconnector and second disconnector, the other end of described isolating switch connects described current transformer one end, the other end of described current transformer connects an end of described the 3rd disconnector and an end of second grounding switch respectively, the other end ground connection of described second grounding switch, the other end difference stube cable output terminal of described the 3rd disconnector and an end of line side grounding switch, the other end ground connection of described line side grounding switch, it is characterized in that this measuring method comprises the steps:
Step 1, at first disconnect described isolating switch, and disconnect described first disconnector and second disconnector, remove the logic blocking device between described first grounding switch and described first disconnector and second disconnector, and described first grounding switch combined floodgate is made described isolating switch reliable ground;
Step 2, described second grounding switch of disconnection, described the 3rd disconnector and line side grounding switch close a floodgate, remove the logic blocking device of described second grounding switch and described the 3rd disconnector, the ground connection of removing described line side grounding switch R, S, T end connects row;
Step 3, described breaker closing, use circuit resistance tester to connect R, S, the T link of described line side grounding switch, the voltage end of described circuit resistance tester connects the R link and the T link of described line side grounding switch respectively, and the current terminal of described circuit resistance tester connects the R link and the S link of described line side grounding switch respectively;
Step 4, the described circuit resistance tester power supply of startup, this moment, the resistance value and the current value of described circuit resistance tester all were shown as zero, press the feeler switch of described circuit resistance tester, described circuit resistance tester one is measured the contact resistance value in each phase loop of described isolating switch and described contact resistance value is shown set by step to the loop of step 3 setting.
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| CN200810200468XA CN101685114B (en) | 2008-09-25 | 2008-09-25 | Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence |
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| CN200810200468XA CN101685114B (en) | 2008-09-25 | 2008-09-25 | Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence |
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| CN101685114B CN101685114B (en) | 2011-05-04 |
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| CN102073003A (en) * | 2011-02-16 | 2011-05-25 | 上海思源高压开关有限公司 | Insulation test tool for gas-insulated metal-enclosed switchgear (GIS) |
| CN103344839A (en) * | 2013-07-01 | 2013-10-09 | 江苏大学 | Wireless detection method and device for contact resistance of busbar joint |
| CN104459529A (en) * | 2014-12-21 | 2015-03-25 | 国家电网公司 | Double-loop-current testing method for mechanical characteristic test of transformer substation high-voltage circuit breaker |
| CN104655955A (en) * | 2014-08-01 | 2015-05-27 | 江苏大学 | Method and experimental device for predicting service life of bus joint |
| CN104849559A (en) * | 2015-06-01 | 2015-08-19 | 绵阳市维博电子有限责任公司 | Apparatus and method for testing contact resistance of conductive slip ring automatically |
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| CN107727932A (en) * | 2017-09-14 | 2018-02-23 | 中国长江电力股份有限公司 | A kind of loop resistance measurement method under the conditions of Multi- Switch of singly being gone here and there in GIS series connection |
| CN108899911A (en) * | 2018-08-16 | 2018-11-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Direct current transformer substation system |
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| CN102073003A (en) * | 2011-02-16 | 2011-05-25 | 上海思源高压开关有限公司 | Insulation test tool for gas-insulated metal-enclosed switchgear (GIS) |
| CN103344839A (en) * | 2013-07-01 | 2013-10-09 | 江苏大学 | Wireless detection method and device for contact resistance of busbar joint |
| CN103344839B (en) * | 2013-07-01 | 2015-08-05 | 江苏大学 | A kind of busbar joint contact resistance method for wirelessly testing and device |
| CN104655955B (en) * | 2014-08-01 | 2017-02-15 | 江苏大学 | Method and experimental device for predicting service life of bus joint |
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| CN105870971A (en) * | 2016-05-31 | 2016-08-17 | 中国能源建设集团广东省电力设计研究院有限公司 | Anti-misoperation locking system and method for power plant |
| CN106483382A (en) * | 2016-11-23 | 2017-03-08 | 云南电网有限责任公司电力科学研究院 | A kind of GIS circuit loop resistance measuring instrument and measuring method |
| CN107064643A (en) * | 2017-01-19 | 2017-08-18 | 国家电网公司 | 1000 kilovolts of GIS device major loop method for testing resistance |
| CN107727932A (en) * | 2017-09-14 | 2018-02-23 | 中国长江电力股份有限公司 | A kind of loop resistance measurement method under the conditions of Multi- Switch of singly being gone here and there in GIS series connection |
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