CN103499759A - Method for searching DC (Direct Current) misconnection - Google Patents
Method for searching DC (Direct Current) misconnection Download PDFInfo
- Publication number
- CN103499759A CN103499759A CN201310444305.7A CN201310444305A CN103499759A CN 103499759 A CN103499759 A CN 103499759A CN 201310444305 A CN201310444305 A CN 201310444305A CN 103499759 A CN103499759 A CN 103499759A
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- ground
- direct current
- current cabinet
- earth point
- misconnection
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Abstract
The invention discloses a method for searching DC (Direct Current) misconnection, and particularly relates to a method for searching the DC misconnection by adding a ground resistor at a positive electrode to ground or a negative electrode to ground and manually damaging the impedance balance degree between the positive electrode to ground and the negative electrode to ground in misconnection, which has a good engineering application value on the DC misconnection, which is in electrical connection, of a secondary circuit under different DC air switches. When mixed power supplies are detected in a transformer substation which is in running during practical application, the mixed power supplies relate to a protection power supply and a control power supply, particularly, the searching which is carried out by a pulling a way is prohibited by the control power supply, a detection instrument is used under an electrified situation, the mixed power supplies exist in which interval unit can be judged, and then power failure treatment can be waited to be carried out. The method disclosed by the invention has the advantages that the operation is simple, convenient and direct, convenience and quickness are realized, the working efficiency is increased, and the market promotion value is high.
Description
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444305.7A CN103499759A (en) | 2013-09-26 | 2013-09-26 | Method for searching DC (Direct Current) misconnection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444305.7A CN103499759A (en) | 2013-09-26 | 2013-09-26 | Method for searching DC (Direct Current) misconnection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103499759A true CN103499759A (en) | 2014-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310444305.7A Withdrawn CN103499759A (en) | 2013-09-26 | 2013-09-26 | Method for searching DC (Direct Current) misconnection |
Country Status (1)
| Country | Link |
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| CN (1) | CN103499759A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472353A (en) * | 2013-09-26 | 2013-12-25 | 国网河南省电力公司南阳供电公司 | Method for seeking direct-current cross |
-
2013
- 2013-09-26 CN CN201310444305.7A patent/CN103499759A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472353A (en) * | 2013-09-26 | 2013-12-25 | 国网河南省电力公司南阳供电公司 | Method for seeking direct-current cross |
| CN103472353B (en) * | 2013-09-26 | 2016-02-03 | 国网河南新野县供电公司 | A kind of method of searching direct current swinging cross |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20140108 |