CN107727932B - A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection - Google Patents

A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection Download PDF

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CN107727932B
CN107727932B CN201710827948.8A CN201710827948A CN107727932B CN 107727932 B CN107727932 B CN 107727932B CN 201710827948 A CN201710827948 A CN 201710827948A CN 107727932 B CN107727932 B CN 107727932B
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switch
grounding
grounding switch
isolation
breaker
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CN107727932A (en
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李广
余维坤
覃国茂
罗小鹏
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China Yangtze Power Co Ltd
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China Yangtze Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection, utilize the opportunity of GIS interruption maintenance, by switching different grounding switch leading-out terminals, and apply the method for Current Voltage on leading-out terminal, the chance being had a power failure by several times using switch in string, after carrying out classification measurement to the contact resistance of switch and grounding switch circuit, and by simple algebraic manipulation, to eliminate the influence of grounding switch contact bring contact resistance error.The present invention makes up using the deficiency that GIS breaker loop resistor is unable to measure under full-closed structure.

Description

A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection
Technical field
The loop resistance measurement method singly gone here and there under the conditions of Multi- Switch series connection in a kind of GIS of the present invention, is related to electric system peace Full technical field.
Background technique
With the continuous improvement of substation capacity and voltage class, gas insulated switchgear system (GIS) is in power train It is widely applied in system.In order to which whether the contact condition for assessing SF6 contact of breaker is good, the loop resistance test of switch is must not The pilot project that can lack.However, since GIS total system uses full-closed structure, if conventionally to SF6 open circuit Device measures, it is necessary to have a power failure to all switches of GIS in single string string, whole station power failure may be needed just to be able to satisfy examination in certain stations The safety condition tested, but this does not allow for the safe operation of electric system.Therefore, at present still without reliable method Individually SF6 breaker in GIS is measured.
Summary of the invention
In order to solve the above technical problems, the present invention provides the loop resistance under the conditions of singly going here and there Multi- Switch series connection in a kind of GIS Measurement method, this method is by using the extraction of grounding switch and the terminals of connecting wire of shell, during measurement loop resistance Electric current and voltage leading-in terminal, it is individually right to realize to the mutual switching between different terminals and during having a power failure twice The loop resistance of SF6 breaker measures.GIS breaker loop resistor under full-closed structure is used to be unable to measure to make up It is insufficient.
The technical scheme adopted by the invention is as follows:
A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection, using GIS interruption maintenance when Machine by switching different grounding switch leading-out terminal, and applies on leading-out terminal the method for Current Voltage, using opening in string The chance having a power failure by several times is closed, after carrying out classification measurement to the contact resistance of switch and grounding switch circuit, and passes through simple generation Number calculates, to eliminate the influence of grounding switch contact bring contact resistance error.
The loop resistance measurement method singly gone here and there under the conditions of Multi- Switch series connection in a kind of GIS of the present invention, advantage are:
1: GIS sealing structure can not be dismantled and measured.
2: when meeting all safety measures of GIS device hotline maintenance, realizing to the accurate of breaker circuit Measurement.
3: measurement result is free from the influence of the external environment.
4: the measurement method suitable for all single string Multi- Switch multiple branch circuit breaker loop resistors.
Detailed description of the invention
Fig. 1 is typical 3/2 wiring diagram.
Specific embodiment
A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection, using GIS interruption maintenance when Machine by switching different grounding switch leading-out terminal, and applies on leading-out terminal the method for Current Voltage, using opening in string The chance having a power failure by several times is closed, after carrying out classification measurement to the contact resistance of switch and grounding switch circuit, and passes through simple generation Number calculates, to eliminate the influence of grounding switch contact bring contact resistance error.
Fig. 1 is typical 3/2 wiring diagram, and capital equipment and component have:
(1): two bus units: bus unit 1M, bus unit 2M；Its grounding switch be respectively grounding switch 117 and Grounding switch 217.
(2): three SF6 breaker units: 1# SF6 breaker unit, 2# SF6 breaker unit, 3# SF6 breaker Unit.Each SF6 breaker unit is made of a breaker, two isolation switch, two grounding switchs.As 1# SF6 is disconnected Road device unit, by No. 1 breaker, isolation switch 11 and isolation switch 12, grounding switch 117 and grounding switch 127 are constituted.
(3): two tributary units: No. 1 and No. 3 tributary units, each tributary unit is by an isolation switch and two Grounding switch is constituted, such as No. 1 tributary unit, is made of isolation switch 16 and isolation switch 167, isolation switch 1617.
Under normal operating conditions, 1 branch band incoming breaker or a bus belt is at most allowed to connect with bus Breaker be in interruption maintenance state.
For measuring the loop resistance of 2# SF6 breaker unit.The measurement needs respectively to carry out twice two branches Have a power failure.
Step 1: when branch one has a power failure, and 1#SF6 breaker unit, 2# SF6 breaker unit have a power failure, related each ground connection It can permit state are as follows: grounding switch 227,117 reliable ground of grounding switch, ground connection cannot open in flakes；Grounding switch 217, Grounding switch 127, grounding switch 167 are closed, and ground connection can open in flakes；
At this point, the ground connection of opening grounding switch 217 and grounding switch 167 is in flakes, and the unit is surveyed twice respectively Amount
A. by the both ends input current in flakes of grounding switch 217 and grounding switch 227, and in grounding switch 217 and ground connection 227 both ends of disconnecting link measure relevant voltage, obtain resistance value are as follows:
R1 measurement=R217+R2+R227(1)
B. by grounding switch 167 and grounding switch 227 input current in flakes, and in grounding switch 217 and grounding switch 227 Both ends measure relevant voltage, obtain loop resistance value are as follows:
R2 measurements= R2+R227(2).
Step 2: when branch three has a power failure, and 2# SF6 breaker unit and 3# SF6 breaker unit have a power failure, correlation is respectively connect Ground can permit state are as follows: grounding switch 327,217 reliable ground of grounding switch, ground connection cannot open in flakes；
Grounding switch 317, grounding switch 227, grounding switch 367 are closed, and ground connection can open in flakes；
At this point, the ground connection of opening grounding switch 367 is in flakes, and the unit is measured twice respectively.
C. by grounding switch 367 and grounding switch 217 input current in flakes, and in grounding switch 217 and grounding switch 227 Both ends measure relevant voltage, obtain loop resistance value are as follows:
R3 measurements= R2+R217 (3)
Step 3: calculate: formula (2)+(3)-(1) has:
R2= R2 measurements+ R3 measurements- R1 measurement
That is: the loop resistance value R of 2# SF6 breaker unit can be obtained2。
R is calculated after measuring respectively when having a power failure using bus unit 1M, No. 1 inlet wire for 1# SF6 breaker unit1。
R is calculated after measuring respectively when having a power failure using bus unit 3M, No. 3 inlet wires for 3# SF6 breaker unit3。

Claims (4)

1. the loop resistance measurement method under the conditions of a kind of Multi- Switch of singly being gone here and there in GIS series connection, characterized by comprising:
Two bus units: the first bus unit, the second bus unit；Its grounding switch is respectively as follows: the first grounding switch, second Grounding switch；
Three SF6 breaker units: 1# SF6 breaker unit, 2# SF6 breaker unit, 3# SF6 breaker unit；
Each SF6 breaker unit is made of a breaker, two isolation switch, two grounding switchs,
1# SF6 breaker unit, by No. 1 breaker, the first isolation switch, the second isolation switch, third grounding switch and Four grounding switchs are constituted；First bus unit is separately connected first isolation switch one end, first grounding switch one end, the first ground connection Disconnecting link other end ground connection；The first isolation switch other end connects No. 1 breaker one end, third grounding switch one end, third ground connection Disconnecting link other end ground connection, No. 1 breaker other end are separately connected the 4th grounding switch one end, second isolation switch one end；4th Grounding switch other end ground connection；
2# SF6 breaker unit, by No. 2 breakers, third isolation switch, the 4th isolation switch, the 5th grounding switch and Six grounding switchs are constituted；
The second isolation switch other end connects third isolation switch one end, and the third isolation switch other end is separately connected No. 2 open circuits Device one end, the 5th grounding switch one end, the 5th grounding switch other end ground connection；No. 2 breaker other ends be separately connected the 4th every From disconnecting link one end, the 6th grounding switch one end, the 6th grounding switch other end ground connection；
3# SF6 breaker unit, by No. 3 breakers, the 5th isolation switch, the 6th isolation switch, the 7th grounding switch and Eight grounding switchs are constituted；The 4th isolation switch other end connects the 5th isolation switch one end, the 5th isolation switch other end difference Connect No. 3 breaker one end, the 7th grounding switch one end；7th grounding switch other end ground connection；No. 3 breaker other end difference Connect the 6th isolation switch one end, the 8th grounding switch one end, the 8th grounding switch other end ground connection；6th isolation switch is another The second bus unit of end connection；
Two tributary units: No. 1 tributary unit, No. 2 tributary units, each tributary unit are connect by an isolation switch and two Ground disconnecting link is constituted；
No. 1 tributary unit, is made of the 7th isolation switch, the 8th isolation switch, the 9th isolation switch；7th isolation switch one End connection third isolation switch one end, the 8th isolation switch one end, the 8th isolation switch other end ground connection；7th isolation switch is another One end connects the 9th isolation switch one end, the 9th isolation switch other end ground connection；
No. 2 tributary units, are made of the tenth isolation switch, the 11st isolation switch, the 12nd isolation switch；Tenth isolation knife Lock one end connects the 4th isolation switch other end, the 11st isolation switch one end, the 11st isolation switch other end ground connection；Tenth The isolation switch other end connects the 12nd isolation switch one end, the 12nd isolation switch other end ground connection；
Loop resistance measurement method the following steps are included:
The loop resistance of 2# SF6 breaker unit is measured, measurement needs respectively have a power failure twice to two branches,
Step 1: when No. 1 tributary unit has a power failure, and 1#SF6 breaker unit, 2# SF6 breaker unit have a power failure, related each ground connection It can allow for state are as follows: the 6th grounding switch, third grounding switch reliable ground, ground connection cannot open in flakes；5th earthing Lock, the 4th grounding switch, the 8th grounding switch closure, ground connection can open in flakes；
At this point, the ground connection of the 5th grounding switch of opening and the 8th grounding switch is in flakes, and respectively to 1#SF6 breaker unit and 2# SF6 breaker unit is measured twice；
It is grounded by the input current of both ends in flakes of the 5th grounding switch and the 6th grounding switch, and in the 5th grounding switch and the 6th Disconnecting link both ends measure relevant voltage, obtain resistance value are as follows:
R1 measurement=R217+R2+R227(1)
By the 8th grounding switch and the 6th grounding switch both ends input current in flakes, and in the 5th grounding switch and the 6th earthing Lock both ends measure relevant voltage, obtain loop resistance value are as follows:
R2 measurements= R2+R227(2)；
Step 2: when No. 2 tributary units have a power failure, and 2# SF6 breaker unit and 3# SF6 breaker unit have a power failure, correlation is respectively connect Ground can allow for state are as follows: the 8th grounding switch, the 5th grounding switch reliable ground, ground connection cannot open in flakes；
7th grounding switch, the 6th grounding switch, the 11st grounding switch closure, ground connection can open in flakes；
At this point, the ground connection of the 11st grounding switch of opening is in flakes, and respectively to 2# SF6 breaker unit and 3# SF6 breaker Unit is measured twice；
It is grounded by the 11st grounding switch and the 5th grounding switch both ends input current in flakes, and in the 5th grounding switch and the 6th Disconnecting link both ends measure relevant voltage, obtain loop resistance value are as follows:
R3 measurements= R2+R217 (3)
Step 3: calculate: formula (2)+(3)-(1) has:
R2= R2 measurements+ R3 measurements- R1 measurement
That is: the loop resistance value R of 2# SF6 breaker unit can be obtained2。
2. the loop resistance measurement method under the conditions of a kind of Multi- Switch of singly being gone here and there in GIS according to claim 1 series connection, feature It is: 1# SF6 breaker unit is calculated after measuring respectively when being had a power failure using the first bus unit, No. 1 tributary unit R1。
3. the loop resistance measurement method under the conditions of a kind of Multi- Switch of singly being gone here and there in GIS according to claim 1 series connection, feature It is: 3# SF6 breaker unit is calculated after measuring respectively when being had a power failure using the second bus unit, No. 2 tributary units R3。
4. the loop resistance measurement side under the conditions of Multi- Switch of singly being gone here and there in any one GIS as described in claims 1 or 2 or 3 series connection Method, it is characterised in that: the measurement method suitable for all single string Multi- Switch multiple branch circuit breaker loop resistors.
CN201710827948.8A 2017-09-14 2017-09-14 A kind of loop resistance measurement method singly gone here and there in GIS under the conditions of Multi- Switch series connection Active CN107727932B (en)

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CN108594019B (en) * 2018-03-19 2024-01-16 广东电网有限责任公司中山供电局 GIS loop resistance testing device and method without detaching grounding bar

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101368995A (en) * 2008-08-29 2009-02-18 齐齐哈尔电业局 Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer
CN101685114A (en) * 2008-09-25 2010-03-31 上海宝钢设备检修有限公司 Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence
JP2014128165A (en) * 2012-12-27 2014-07-07 Chugoku Electric Power Co Inc:The Insulation determination system
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101368995A (en) * 2008-08-29 2009-02-18 齐齐哈尔电业局 Non-head dismantling test method for GIS combined electrical apparatus and plug-pull type transformer
CN101685114A (en) * 2008-09-25 2010-03-31 上海宝钢设备检修有限公司 Measurement method of GIS fully enclosed 126KV combined circuit breaker contact persistence
JP2014128165A (en) * 2012-12-27 2014-07-07 Chugoku Electric Power Co Inc:The Insulation determination system
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

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