CN103472353A - Method for seeking direct-current cross - Google Patents

Method for seeking direct-current cross Download PDF

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Publication number
CN103472353A
CN103472353A CN2013104443019A CN201310444301A CN103472353A CN 103472353 A CN103472353 A CN 103472353A CN 2013104443019 A CN2013104443019 A CN 2013104443019A CN 201310444301 A CN201310444301 A CN 201310444301A CN 103472353 A CN103472353 A CN 103472353A
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CN
China
Prior art keywords
ground
direct current
over
current cabinet
earth point
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Granted
Application number
CN2013104443019A
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Chinese (zh)
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CN103472353B (en
Inventor
王玉玺
高洪杰
张子军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STATE GRID HENAN XINYE POWER SUPPLY COMPANY
Original Assignee
Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
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Application filed by Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd filed Critical Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority to CN201310444301.9A priority Critical patent/CN103472353B/en
Publication of CN103472353A publication Critical patent/CN103472353A/en
Application granted granted Critical
Publication of CN103472353B publication Critical patent/CN103472353B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention discloses a method for seeking direct-current cross. According to the method, a grounding resistor is added in a positive grounding or a negative grounding mode, therefore, the balance degree between cross positive grounding impedance and cross negative grounding impedance of cross is damaged through manual operation, and therefore the direct-current cross can be sought. The method has good engineering application value for the direct-current cross, in electrical connection, of a secondary circuit under different air switches. In practical application, when cross power is checked in a running transformer substation, when a protective power supply and a control power supply are related, and especially when the control power supply is related, seeking conducted by turning off a switch of a power supply line is banned, a detection instrument is used under the electrification condition to judge the power cross exists in which interval unit, and then processing can be conducted after power is cut off. The method is easy, convenient and intuitive to conduct and convenient and rapid to achieve, the work efficiency is improved, and the method has very good marketing value.

Description

A kind of method of searching the direct current swinging cross
Technical field
The invention belongs to power system transformer substation service technique field, be specifically related to a kind of method of searching the direct current swinging cross.
Background technology
The stable reliable correct operation that is directly determining relay protection and aut.eq. of transformer station direct current system, and then determining the safe operation of whole electrical network.The DC ground fault harm of common 2 ground connection is larger, because it may form ground short circuit, causes relay protection, signal, aut.eq. malfunction or tripping, or causes DC insurance fusing, makes protection and aut.eq., control loop lose power supply.Mixed power supply phenomenon is a kind of Novel presentation form of direct supply: the first, and cable core reductions of insulating over the ground, formation earth mat parasitic loop; The second, different direct current skies are opened lower secondary circuit and are had electrical connection; The 3rd, ac and dc systems is crosstalked mutually.These three kinds all can be caused the straight-flow system irregular operating, likely report DC earthing, even make run switch malfunction or tripping.
The transformer station direct current system general introduction
110KV combines from changing transformer station and mostly adopts two cover DC power supply panels at present, and a change-over switch is arranged on each direct current cabinet, and " input " shows to be communicated with earth mat, and " exiting " shows to cut off with earth mat.Transformer station exists a large amount of cables and protective device anti-interference capacitor, and distributed capacitance can not be ignored.Pointer multimeter is hung on the direct-flow positive pole busbar, and pointer gauge can show anodal voltage-to-ground.After direct current cabinet I change-over switch is put into to " exiting " position, multimeter can not monitor the voltage of balance resistance, the existence of distributed capacitance in addition, and voltage can not suddenly change, and pointer can slowly make zero exponentially gradually from normal voltage over the ground.Distributed capacitance belongs to memory cell, searches parasitic loop and in fact with the pointer multimeter shelves of direct voltage, records the charging process of distributed capacitance.A kind of distant and out of sight method of looking for of transforming plant DC ground connection is disclosed in CN 101699304 A.The present invention adopts the milliampere direct current dial table to measure the earth leakage current of tested direct current branch, and its concrete steps are as foretold: the positive and negative electrode wire of tested direct current branch is snapped in to a milliampere level clamp table simultaneously, measure the earth leakage current of this branch road; Balance resistance according to d-c bus voltage value U, straight-flow system } numerical value of the numerical value of WHs and measured earth leakage current, calculate the stake resistance of tested direct current branch; Then according to the size of the stake resistance calculated, judge metallic earthing or insulativity ground connection.It facilitates detection to connect DC earthing to a certain extent, but detect, for the detection of direct current swinging cross, fails to provide solution effectively, so need a kind of method that detects intuitively the direct current swinging cross simple and easy to operate.
Summary of the invention
The invention provides a kind of simple and easy to operately, detect intuitively the people and be and add the method that stake resistance is searched mixed power supply.
In order to realize goal of the invention, the technical scheme adopted:
A kind of method of searching the direct current swinging cross comprises the following steps:
(1). in direct current cabinet I section, exit earth point, test has undamped over against ground and negative voltage-to-ground;
(2). in direct current cabinet II section, exit earth point, test has undamped over against ground and negative voltage-to-ground;
Exit one of them earth point, test result is voltage attenuation, illustrates and does not have sleet jump; Test result is that voltage is undamped, illustrates and has sleet jump;
A. exit direct current cabinet I section earth point; select a wherein standby sky in road to open; over against ground or negative add over the ground a stake resistance; artificial destruction swinging cross positive pole over the ground with negative pole earth impedance quality of balance; direct current cabinet II section earth point, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅡDuan Na road load;
B. exit direct current cabinet II section earth point, select a wherein standby sky in road to open, over against ground or negatively add over the ground a stake resistance, direct current cabinet I section earth point, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅠDuan Na road load.
The present invention is by over against ground or negative add over the ground a stake resistance, artificial destruction swinging cross positive pole is searched the method for direct current swinging cross over the ground with negative pole earth impedance quality of balance, different direct current skies are opened to lower secondary circuit exists the direct current swinging cross of electrical connection to have good engineering using value, when the transformer station be in operation in practical application checks mixed power supply, relate to protection power source and control power supply, especially control power supply, forbid drawing road to be searched, use detecting instrument in charged situation, judge which unit, interval and have mixed power supply, then waiting for has a power failure processes, the present invention is easy and simple to handle directly perceived, convenient and swift, improved work efficiency, there is good market popularization value.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is structural representation of the present invention.
Embodiment
A kind of method of searching intuitively the direct current swinging cross simple and easy to operate.
In order to realize goal of the invention, the technical scheme adopted:
A kind of method of searching the direct current swinging cross comprises the following steps:
(1). in direct current cabinet I section, exit earth point 2, test has undamped over against ground and negative voltage-to-ground;
(2). in direct current cabinet II section, exit earth point 3, test has undamped over against ground and negative voltage-to-ground;
Exit one of them earth point, test result is voltage attenuation, illustrates and does not have sleet jump; Test result is that voltage is undamped, illustrates and has sleet jump,
A. exit direct current cabinet I section earth point 2; select a wherein standby sky in road to open; over against ground or negative add over the ground generally select≤10K of a stake resistance 4(Ω); artificial destruction swinging cross positive pole over the ground with negative pole earth impedance quality of balance; direct current cabinet II section earth point 3, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅡDuan Na road load (as M road load);
B. exit direct current cabinet II section earth point 3, select a wherein standby sky in road to open, over against ground or negative add over the ground a stake resistance 4, direct current cabinet I section earth point, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅠDuan Na road load (as N road load).
The present invention is by over against ground or negative add over the ground a stake resistance, artificial destruction swinging cross positive pole is searched the method for direct current swinging cross over the ground with negative pole earth impedance quality of balance, different direct current skies are opened to lower secondary circuit exists the direct current swinging cross of electrical connection to have good engineering using value, when the transformer station be in operation in actual applications checks mixed power supply, relate to protection power source and control power supply, especially control power supply, forbid drawing road to be searched, use detecting instrument in charged situation, judge which unit, interval and have mixed power supply, then waiting for has a power failure processes, the present invention is easy and simple to handle directly perceived, convenient and swift, improved work efficiency, there is good market popularization value.

Claims (1)

1. a method of searching the direct current swinging cross, it is characterized in that: concrete steps are as follows:
(1). in direct current cabinet I section, exit earth point, test has undamped over against ground and negative voltage-to-ground;
(2). in direct current cabinet II section, exit earth point, test has undamped over against ground and negative voltage-to-ground;
Exit one of them earth point, test result is voltage attenuation, illustrates and does not have sleet jump;
Test result is that voltage is undamped, illustrates and has sleet jump, in order to determine which road load, has swinging cross, adopts following method:
A. exit direct current cabinet I section earth point; select a wherein standby sky in road to open; over against ground or negative add over the ground a stake resistance; artificial destruction swinging cross positive pole over the ground with negative pole earth impedance quality of balance; direct current cabinet II section earth point, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅡDuan Na road load;
B. exit direct current cabinet II section earth point, select a wherein standby sky in road to open, over against ground or negatively add over the ground a stake resistance, direct current cabinet I section earth point, at the input state, checks out that by pick-up unit there is ground connection in direct current cabinet ⅠDuan Na road load.
CN201310444301.9A 2013-09-26 2013-09-26 A kind of method of searching direct current swinging cross Expired - Fee Related CN103472353B (en)

Priority Applications (1)

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CN201310444301.9A CN103472353B (en) 2013-09-26 2013-09-26 A kind of method of searching direct current swinging cross

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CN103472353B CN103472353B (en) 2016-02-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103698651A (en) * 2013-12-27 2014-04-02 国家电网公司 Method and device for monitoring crossing of direct current insulated buses

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CN201662602U (en) * 2009-12-24 2010-12-01 魏增夏 Insulated on-line detection instrument of neutral point grounding high-voltage electric power system
CN202735453U (en) * 2012-07-31 2013-02-13 国电南京自动化股份有限公司 Detection circuit for bus grounding in direct current system
CN103499759A (en) * 2013-09-26 2014-01-08 国网河南省电力公司南阳供电公司 Method for searching DC (Direct Current) misconnection

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Publication number Priority date Publication date Assignee Title
US4524321A (en) * 1982-05-27 1985-06-18 At&T Technologies, Inc. Method and apparatus for testing cable wire connected to terminals at a remote location
KR100933335B1 (en) * 2009-03-09 2009-12-22 (주)카스트엔지니어링 How to detect leakage of electrical wire
CN101699304A (en) * 2009-10-27 2010-04-28 河北省电力公司超高压输变电分公司 Direct current grounding trouble shooting method for substation
CN201662602U (en) * 2009-12-24 2010-12-01 魏增夏 Insulated on-line detection instrument of neutral point grounding high-voltage electric power system
CN202735453U (en) * 2012-07-31 2013-02-13 国电南京自动化股份有限公司 Detection circuit for bus grounding in direct current system
CN103499759A (en) * 2013-09-26 2014-01-08 国网河南省电力公司南阳供电公司 Method for searching DC (Direct Current) misconnection

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103698651A (en) * 2013-12-27 2014-04-02 国家电网公司 Method and device for monitoring crossing of direct current insulated buses
CN103698651B (en) * 2013-12-27 2016-05-11 国家电网公司 A kind ofly supervise method and the device that D.C. isolation bus is altered mutually

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Address after: 473500 No. 13 Chaoyang Road, Xinye County, Nanyang, Henan

Applicant after: STATE GRID HENAN XINYE POWER SUPPLY COMPANY

Address before: 473000 Henan City, Nanyang province people's North Road, No. 268

Applicant before: Nanyang Power Supply Company, State Grid Henan Electric Power Company

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