CN109633352A - The method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current - Google Patents
The method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current Download PDFInfo
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- CN109633352A CN109633352A CN201811534034.3A CN201811534034A CN109633352A CN 109633352 A CN109633352 A CN 109633352A CN 201811534034 A CN201811534034 A CN 201811534034A CN 109633352 A CN109633352 A CN 109633352A
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- mutual inductor
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A method of three-phase or the secondary wiring of biphase current mutual inductor are checked using single-phase alternating current, threephase current transformer A, B, C primary side is sequentially connected in series along polarity or is sequentially connected in series two-phase current mutual inductor A, C primary side along polarity, adds single-phase alternating current to the current transformer primary side being together in series；There is current transformer if it is three-phase, then measures electric current between the every phase phase current of threephase current transformer secondary side and Y point-earth (N)；Have current transformer if it is two-phase, then measure the every phase phase current of biphase current mutual inductor secondary side and Y it is point-earth between (N) electric current.The present invention by phase current and point-earth (N) the amount of current relationship of Y it may determine that secondary wiring of current mutual inductor whether just, the reliable in action of current protection when effectively can guarantee to break down using the present invention, to guarantee equipment and personnel safety.
Description
Technical field:
The invention belongs to high-voltage power supply and distribution system construction fields, in particular to a kind of to check three-phase using single-phase alternating current
Or the method for the secondary wiring of biphase current mutual inductor.
Background technique:
High pressure power supply and distribution is widely used in each industrial circle, and current transformer is the electric current inspection in high-voltage power supply and distribution system
Original part is surveyed, current protection and current measurement are used for.When electric short circuit failure occurs, current protection can it is reliable, accurate, whether
Failure can be quickly cut off, electrical equipment and personal safety are directly related to.So only guaranteed secondary wiring of current mutual inductor
It is correct, just can guarantee the reliable in action of current protection when breaking down, to just can guarantee equipment and personnel safety, otherwise shadow
Plant produced is rung, heavy economic losses is caused.
Summary of the invention:
The object of the invention is that overcome above-mentioned the deficiencies in the prior art, and provides and a kind of utilize single phase ac
The method of galvanoscopy three-phase or the secondary wiring of biphase current mutual inductor, it is electric when effectively can guarantee to break down using this method
The reliable in action of protection is flowed, to guarantee equipment and personnel safety.
As above design, the technical scheme is that a kind of check that three-phase or biphase current are mutual using single-phase alternating current
The method of the secondary wiring of sensor, it is characterised in that: be sequentially connected in series threephase current transformer A, B, C primary side along polarity or by two
Phase current mutual inductor A, C primary side is sequentially connected in series along polarity, adds single-phase alternating current to the current transformer primary side being together in series
Stream；There is current transformer if it is three-phase, then measures between the every phase phase current of threephase current transformer secondary side and Y point-earth (N)
Electric current, for symmetrical three-phase alternating current vector relations are as follows:Add the identical list of direction vector
Phase alternating current flow relation are as follows: IY-N=IA+IB+IC=3IA=3IB=3IC；There is current transformer if it is two-phase, then measures two-phase
(N) electric current between the every phase phase current in Current Transformer Secondary side and Y are point-earth, two-phase alternating current vector relations are as follows:Add the identical single-phase alternating current flow relation in direction are as follows: IY-N=IA+IC=2IA=2IC, pass through mutually electricity
Stream and point-earth (N) the amount of current relationship of Y it may determine that secondary wiring of current mutual inductor whether just.
The above-mentioned current transformer primary side being together in series adds the current value of single-phase alternating current to be higher than a rated current
30%.
Present invention employs the principle three-phases of three-phase current vector relationship or the secondary wiring of biphase current mutual inductor to be examined
It surveys, when electric short circuit failure occurs, can rapidly and accurately cut off failure, be connect to be effectively guaranteed Current Transformer Secondary
Line it is correct, ensure that equipment and personnel safety.And the present invention needs equipment few, easy to operate, safe and reliable, accurate.
Detailed description of the invention:
Fig. 1 is the circuit theory schematic diagram of the present invention detection secondary wiring of threephase current transformer；
Fig. 2 is the circuit theory schematic diagram of the present invention detection secondary wiring of two-phase current mutual inductor.
In figure: TY--- automatic coupling voltage regulator；B--- strong current generator.
Specific embodiment:
A method of three-phase or the secondary wiring of biphase current mutual inductor are checked using single-phase alternating current, use three-phase
The principle of current vector relationship, needs two people to operate, and a people adds single-phase alternating current, a secondary electricity of people's measurement current transform er
Stream.
Detection method is carried out to the secondary wiring of threephase current transformer as shown in Figure 1: are as follows: A, B, C three-phase current mutual inductance
Secondary winding uses Y connection, i.e. three-phase and formula wiring, current relationship are as follows: IY-N=IA+IB+IC, way is: A phase current is mutual
The P of sensor primary side2End and B phase current mutual inductor primary side P1End, B phase current mutual inductor primary side P2End and the mutual inductance of C phase current
Device primary side P1End is connected with high current line, from A phase current mutual inductor primary side P1End and C phase current mutual inductor primary side P2End
Add single phase ac, added electric current is that Current Transformer Secondary electric current is 1 ampere, records A phase, B phase, C phase Current Transformer Secondary
Side electric current and point-earth (N) electric current of Y.If surveyed electric current IA=IB=IC=1 (ampere), and IY-N=3 (amperes), i.e. IY-N=
3IA=3IB=3IC, then threephase current transformer secondary connection is correct, otherwise, threephase current transformer secondary connection mistake.
It is as shown in Figure 2: detection method to be carried out to the secondary wiring of threephase current transformer are as follows: A, C biphase current mutual inductor
Using incomplete Y connection, i.e. two-phase and formula wiring, current relationship are as follows: IY-N=IA+IC, way is: A phase current mutual inductor
Primary side P2End and C phase current mutual inductor primary side P1End is connected with high current line, from A phase current mutual inductor primary side P1End and C
Phase current mutual inductor primary side P2End plus single phase ac, added electric current is that Current Transformer Secondary electric current is 1 ampere, record A phase,
C phase current mutual inductor secondary side current and point-earth (N) electric current of Y.If surveyed electric current IA=IC=1 (ampere), and IY-N=2
(ampere), i.e. IY-N=2IA=2IC, then biphase current mutual inductor secondary connection is correct, and otherwise, biphase current mutual inductor is secondary to be connect
Line mistake.
Claims (2)
1. a kind of method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current, it is characterised in that:
By threephase current transformer A, B, C primary side be sequentially connected in series along polarity or by two-phase current mutual inductor A, C primary side along polarity according to
Secondary series connection adds single-phase alternating current to the current transformer primary side being together in series；There is current transformer if it is three-phase, then
Electric current between the every phase phase current of threephase current transformer secondary side and Y point-earth (N) is measured, symmetrical three-phase alternating current is flowed to
Magnitude relation are as follows:Add the identical single-phase alternating current flow relation of direction vector are as follows: IY-N=IA+IB+IC
=3IA=3IB=3IC；There is current transformer if it is two-phase, then measures the every phase phase current of biphase current mutual inductor secondary side and Y
Point-earth (N) electric current, two-phase alternating current vector relations are as follows:Add the identical single phase ac in direction
Current relationship are as follows: IY-N=IA+IC=2IA=2IC, by point-earth (N) the amount of current relationship of phase current and Y it may determine that electricity
Just whether current transformer secondary connection.
2. a kind of utilization single-phase alternating current according to claim 1 checks three-phase or the secondary wiring of biphase current mutual inductor
Method, it is characterised in that: the above-mentioned current transformer primary side being together in series add single-phase alternating current current value be higher than one
The 30% of secondary rated current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811534034.3A CN109633352A (en) | 2018-12-14 | 2018-12-14 | The method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811534034.3A CN109633352A (en) | 2018-12-14 | 2018-12-14 | The method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current |
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| Publication Number | Publication Date |
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| CN109633352A true CN109633352A (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811534034.3A Pending CN109633352A (en) | 2018-12-14 | 2018-12-14 | The method for checking three-phase or the secondary wiring of biphase current mutual inductor using single-phase alternating current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749834A (en) * | 2019-11-26 | 2020-02-04 | 广东电网有限责任公司 | On-load test analysis method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809039A (en) * | 2013-12-02 | 2014-05-21 | 国家电网公司 | Method for testing current transformers in substation |
| CN104597372A (en) * | 2014-12-31 | 2015-05-06 | 中国二冶集团有限公司 | Method for verifying relay protection secondary system |
| CN104698335A (en) * | 2013-12-06 | 2015-06-10 | 中冶天工集团有限公司 | Method for realizing systematic debugging of high-voltage transformer substation by using low-voltage electricity |
-
2018
- 2018-12-14 CN CN201811534034.3A patent/CN109633352A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809039A (en) * | 2013-12-02 | 2014-05-21 | 国家电网公司 | Method for testing current transformers in substation |
| CN104698335A (en) * | 2013-12-06 | 2015-06-10 | 中冶天工集团有限公司 | Method for realizing systematic debugging of high-voltage transformer substation by using low-voltage electricity |
| CN104597372A (en) * | 2014-12-31 | 2015-05-06 | 中国二冶集团有限公司 | Method for verifying relay protection secondary system |
Non-Patent Citations (1)
| Title |
|---|
| 李元锋 等: "互感器二次回路安装试验及检查方法", 《电力安全技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749834A (en) * | 2019-11-26 | 2020-02-04 | 广东电网有限责任公司 | On-load test analysis method |
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Application publication date: 20190416 |
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