CN102854407A - Method for performing test on entire transformer longitudinal differential protection set by utilizing another transformer - Google Patents
Method for performing test on entire transformer longitudinal differential protection set by utilizing another transformer Download PDFInfo
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- CN102854407A CN102854407A CN2011101809306A CN201110180930A CN102854407A CN 102854407 A CN102854407 A CN 102854407A CN 2011101809306 A CN2011101809306 A CN 2011101809306A CN 201110180930 A CN201110180930 A CN 201110180930A CN 102854407 A CN102854407 A CN 102854407A
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Abstract
A method for performing tests on an entire transformer longitudinal differential protection set by utilizing another transformer. A construction site includes a transformer T1 and a transformer T2, rated capability of the T1 and the T2 is 10000kVA, rated voltage of the T1 and the T2 is 10/3.15kV, rated current of the T1 and T2 is 577/1830A, and short circuit impedance of the T1 and T2 is 6.90%. The method is characterized by including the steps of (a), subjecting an ABC three-phase winding on a secondary side of the tested transformer T1 to short circuit via a cable with an appropriate section; (b) correspondingly connecting an ABC three-phase winding on a primary side of the tested transformer T1 with an ABC three-phase winding on a secondary side of the transformer T2 via a cable with an appropriate section; (c) connecting an ABC three-phase winding on a primary side of the transformer T2 to a 390V interim test power source via a switch; and (d) applying voltage at 390V on the ABC three-phase winding on the primary side of the transformer T2, so that corresponding short-circuit current is generated on a primary winding and a secondary winding of the tested transformer T1.
Description
Technical field
The present invention relates to a kind of transformer differential protection total group test method of relay protection of power system, specifically, is a kind of method of utilizing other transformers to carry out the transformer differential protection total group test.
Background technology
As the longitudinal differential protection of one of transformer main protection, be by the circulating current principle, consist of with the amplitude of each side electric current of transformer relatively and phase place principle; It does not flow through because there being action current in the protective device, so protective device can not move when normal operation and protection domain external fault; And heterogeneous short trouble occurs in Transformer Winding and extension line; heavy current grounding system side winding and extension line single phase ground fault; and winding inter-turn is when being short-circuited fault; can be fast without selectively moving each side isolating switch of tripping transformer; thereby reach quick excision fault, the purpose of protection transformer.
In order to guarantee transformer differential protection device energy correct operation under failure condition, transformer needs employing carry out systems inspection from the method that the transformer primary side passes into large electric current before putting into operation.The transformer that particularly star/triangle is connect, the wiring polarity correctness of its longitudinal difference protection only has by large electric current total group test verification and validation preferably.
Under normal conditions, the transformer differential protection total group test generally is the secondary circuit short-circuit with tested transformer, carries out in the way that tested transformer primary side adds suitable three-phase voltage by adopting a bench teat to test transformer.For ease of test, the construction power supply capacity can satisfy in the testing requirements situation at the scene, by Calculation Verification, also can directly directly pass into three-phase 380V power supply at tested transformer primary side and test.
Yet in most practice of construction processes; for various reasons; the situations such as the construction power supply capacity that the working-yard usually occurs not or test transform capacity is inadequate; can't directly directly pass into three-phase 380V power supply at tested transformer primary side, cause the longitudinal difference protection total group test of tested transformer to carry out.
Therefore the longitudinal difference protection total group test method of known transformer exists above-mentioned all inconvenience and problem.
Summary of the invention
Purpose of the present invention is to propose a kind of other transformers that utilize that solve the large capacity power source problem of tested transformer differential protection total group test and carries out the method for transformer differential protection total group test.
For achieving the above object, technical solution of the present invention is:
A kind of method of utilizing other transformers to carry out the transformer differential protection total group test; the working-yard comprises transformer T1 and T2; its rated capacity 10000kVA, rated voltage 10/3.15kV, rated current 577/1830A, short-circuit impedance 6.90%, rated voltage ratio 3.174 is characterized in that may further comprise the steps:
A, secondary side ABC three phase windings of the tested transformer T1 cable by suitable cross section is carried out short circuit;
B, secondary side ABC three phase windings of primary side ABC three phase windings of tested transformer T1 and the transformer T2 cable by suitable cross section is linked together accordingly;
C, primary side ABC three phase windings of transformer T2 are connected on the 390V interim trial power supply by switch;
D, apply three-phase 390V voltage at the primary side ABC of transformer T2 three phase windings, on first and second winding of tested transformer T1, just produce corresponding short-circuit current, just can carry out the longitudinal difference protection total group test to tested transformer T1.
The method of utilizing other transformers to carry out the transformer differential protection total group test of the present invention can also be further achieved by the following technical measures.
Aforesaid method, the Current calculation formula of experiment power supply is in the wherein said steps d:
The experiment power supply electric current:
=
Aforesaid method, the calculation of capacity formula of experiment power supply is in the wherein said steps d:
The experiment power supply capacity:
=
After adopting technique scheme, the method for utilizing other transformers to carry out the transformer differential protection total group test of the present invention has the following advantages:
1, not needing to use extra large capacity test transformer provides experiment power supply to tested transformer, can reduce the portage of large capacity test transformer, thus reducing construction cost;
2, just can carry out total group test in the situation of conditions being possessed at the scene, can not be subjected to large capacity test transformer not at the construction field (site) or the restriction of other reasons, constructability carries out smoothly, guarantees the duration;
3, test effect is splendid, is convenient to promote in engineering construction, use.
Description of drawings
Fig. 1 be the embodiment of the invention directly apply three-phase 390V power supply wiring figure at transformer T1 primary side;
Fig. 2 is that other transformers that utilize of the embodiment of the invention carry out the total group test wiring diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof the present invention is illustrated further.
Embodiment 1
A kind of method of utilizing other transformers to carry out the transformer differential protection total group test; the working-yard comprises transformer T1 and T2; its rated capacity 10000kVA, rated voltage 10/3.15kV, rated current 577/1830A, short-circuit impedance 6.90%, rated voltage ratio 3.174 is characterized in that may further comprise the steps:
A, secondary side ABC three phase windings of the tested transformer T1 cable by suitable cross section is carried out short circuit;
B, secondary side ABC three phase windings of primary side ABC three phase windings of tested transformer T1 and the transformer T2 cable by suitable cross section is linked together accordingly;
C, primary side ABC three phase windings of transformer T2 are connected on the 390V interim trial power supply by switch;
D, apply three-phase 390V voltage at the primary side ABC of transformer T2 three phase windings, on first and second winding of tested transformer T1, just produce corresponding short-circuit current, just can carry out the longitudinal difference protection total group test to tested transformer T1.
There are two main-transformer T1 and T2 in certain steel mill, its rated capacity 10000kVA, rated voltage 10/3.15kV, rated current 577/1830A, short-circuit impedance 6.90%, rated voltage ratio 3.174.Two transformers have all adopted the longitudinal differential protection relay to protect, and carry out the longitudinal difference protection total group test to two main transformers respectively.
Transformer T1 is carried out the longitudinal difference protection total group test, with tested transformer T1 secondary circuit short-circuit, apply three-phase voltage at primary side, then the electric current of experiment power supply and calculation of capacity formula are as follows:
The experiment power supply electric current:
=
The experiment power supply capacity:
=
In the formula:
---the rated current of tested transformer, A;
---the percentage of short-circuit voltage;
If directly apply three-phase 390V power supply at transformer T1 primary side, as shown in Figure 1, then
Tested transformer T1 primary current:
Tested transformer T1 secondary current:
The experiment power supply electric current:
The experiment power supply capacity:
Embodiment 2
Generally be difficult at the construction field (site) find the experiment power supply that 220kVA, electric current 326A can be provided, namely enable to find, also must temporary laid can bear 326A three-phase power cable, this need to increase certain interim measure expense, and it is very inconvenient to construct.
The method of utilizing other transformers to carry out the transformer differential protection total group test of the present invention, connection principle as shown in Figure 2.
Utilize other transformers to carry out the total group test wiring diagram
Experiment power supply for tested transformer T1 is:
Tested transformer T1 primary current:
Tested transformer T1 secondary current:
The experiment power supply electric current:
The experiment power supply capacity:
The scene provides the power supply of capacity 21.89kVA, electric current 32.41 more convenient, and the temporary source cable laying is more convenient, is convenient to carry out transformer and carries out the longitudinal difference protection total group test.
Above embodiment is only for explanation the present invention, but not limitation of the present invention, person skilled in the relevant technique in the situation that do not break away from the spirit and scope of the present invention, can also make various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (3)
1. method of utilizing other transformers to carry out the transformer differential protection total group test; the working-yard comprises transformer T1 and T2; its rated capacity 10000kVA, rated voltage 10/3.15kV, rated current 577/1830A, short-circuit impedance 6.90%, rated voltage ratio 3.174 is characterized in that may further comprise the steps:
A, secondary side ABC three phase windings of the tested transformer T1 cable by suitable cross section is carried out short circuit;
B, secondary side ABC three phase windings of primary side ABC three phase windings of tested transformer T1 and the transformer T2 cable by suitable cross section is linked together accordingly;
C, primary side ABC three phase windings of transformer T2 are connected on the 390V interim trial power supply by switch;
D, apply three-phase 390V voltage at the primary side ABC of transformer T2 three phase windings, on first and second winding of tested transformer T1, just produce corresponding short-circuit current, just can carry out the longitudinal difference protection total group test to tested transformer T1.
2. the method for utilizing other transformers to carry out the transformer differential protection total group test as claimed in claim 1 is characterized in that, the Current calculation formula of experiment power supply is in the described steps d:
The experiment power supply electric current:
=
。
3. the method for utilizing other transformers to carry out the transformer differential protection total group test as claimed in claim 1 is characterized in that, the calculation of capacity formula of experiment power supply is in the described steps d:
The experiment power supply capacity:
=
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101809306A CN102854407A (en) | 2011-06-30 | 2011-06-30 | Method for performing test on entire transformer longitudinal differential protection set by utilizing another transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101809306A CN102854407A (en) | 2011-06-30 | 2011-06-30 | Method for performing test on entire transformer longitudinal differential protection set by utilizing another transformer |
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| CN102854407A true CN102854407A (en) | 2013-01-02 |
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| CN2011101809306A Pending CN102854407A (en) | 2011-06-30 | 2011-06-30 | Method for performing test on entire transformer longitudinal differential protection set by utilizing another transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614213A (en) * | 2018-05-24 | 2018-10-02 | 中国神华能源股份有限公司 | The polarity test method of transformer unit differential protection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU970540A1 (en) * | 1981-01-26 | 1982-10-30 | Пуско-Наладочное Управление Треста "Казэлектромонтаж" | Device for longitudinal differential protection of power transmission line |
| WO2005078885A1 (en) * | 2004-02-13 | 2005-08-25 | Zhejiang University | Method for preventing mal-operation of transformer differential protection |
| CN101615783A (en) * | 2009-07-31 | 2009-12-30 | 西安交通大学 | Zero-sequence current longitudinal differential protection method based on star-connection delta line transformer |
-
2011
- 2011-06-30 CN CN2011101809306A patent/CN102854407A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU970540A1 (en) * | 1981-01-26 | 1982-10-30 | Пуско-Наладочное Управление Треста "Казэлектромонтаж" | Device for longitudinal differential protection of power transmission line |
| WO2005078885A1 (en) * | 2004-02-13 | 2005-08-25 | Zhejiang University | Method for preventing mal-operation of transformer differential protection |
| CN101615783A (en) * | 2009-07-31 | 2009-12-30 | 西安交通大学 | Zero-sequence current longitudinal differential protection method based on star-connection delta line transformer |
Non-Patent Citations (2)
| Title |
|---|
| 张占: "《电力变压器纵差保护电流互感器接线方式的改进》", 《机电工程技术》, vol. 34, no. 12, 31 December 2005 (2005-12-31) * |
| 石凯: "《纵差保护在电力变压器中的应用》", 《中国新技术产品》, 30 September 2010 (2010-09-30), pages 122 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614213A (en) * | 2018-05-24 | 2018-10-02 | 中国神华能源股份有限公司 | The polarity test method of transformer unit differential protection |
| CN108614213B (en) * | 2018-05-24 | 2020-12-01 | 中国神华能源股份有限公司 | Polarity test method for generator-transformer group differential protection |
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Application publication date: 20130102 |