CN107037333B - Wiring structure for partial discharge test of low-voltage side double-winding transformer - Google Patents
Wiring structure for partial discharge test of low-voltage side double-winding transformer Download PDFInfo
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- CN107037333B CN107037333B CN201710196788.1A CN201710196788A CN107037333B CN 107037333 B CN107037333 B CN 107037333B CN 201710196788 A CN201710196788 A CN 201710196788A CN 107037333 B CN107037333 B CN 107037333B
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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
- G01R31/12—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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A wiring structure for partial discharge test of a low-voltage side double-winding transformer is provided, wherein the wiring structure is free of intermediate ground between a first wiring terminal and a second wiring terminal of a partial discharge exciting transformer; the first wiring terminal and the second wiring terminal are respectively connected with a compensation reactor combination; the wiring terminal of one phase winding of the first low-voltage winding is connected with the first wiring terminal of the partial discharge-free exciting transformer, and the wiring terminals of the other 2 phases of windings of the first low-voltage winding are connected with each other; the neutral point connecting terminal of the first low-voltage winding is connected with the connecting terminal of one phase winding of the second low-voltage winding; the connecting terminals of the other 2-phase windings of the second low-voltage winding are connected with each other, and the neutral point connecting terminal of the second low-voltage winding is connected with the second connecting terminal of the non-partial discharge exciting transformer; the tested phase sleeve end screen wiring terminal of the high-voltage side of the tested low-voltage side double-winding transformer is grounded through the detection impedance, and the detection impedance is connected with the partial discharge detector.
Description
Technical Field
The invention relates to a wiring structure for a partial discharge test of a low-voltage side double-winding transformer.
Background
In recent years, in order to save investment cost, only one starting standby transformer is generally designed for a large-scale power plant. The transformer has special structure and has the characteristics of large capacity, large transformation ratio and low-voltage side double windings. When a partial discharge test is performed, the capacitive current of the high-voltage winding is coupled to the pressurizing side through a transformation ratio, and the testing voltage is generally lower on the pressurizing side due to the wiring group, so that the reactive current of the pressurizing side of the transformer exceeds the capacity of test equipment excessively, and the conventional equipment configuration of a debugging unit hardly meets the test requirement.
In the long-term operation process of the transformer, partial discharge can occur at certain weak parts of the internal insulation of the transformer under the action of high field intensity, so that the insulation performance is reduced, and even breakdown of the transformer is caused under the serious partial discharge long-term action, so that the safe and reliable operation of the transformer, particularly the ultra-high voltage transformer, under the long-term working voltage is influenced.
GB50150 provides that when a transformer with the voltage class of 220kV and above is newly installed, an on-site partial discharge test is carried out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wiring structure for a partial discharge test of a low-voltage side double-winding transformer.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a wiring structure for partial discharge test of a low-voltage side double-winding transformer is characterized in that: the device comprises a non-partial discharge variable frequency power supply), a non-partial discharge exciting transformer T, a tested low-voltage side double-winding transformer T1 and a partial discharge detector F;
the output end of the non-partial discharge frequency conversion power supply G is provided with a first wiring terminal and a second wiring terminal, and the middle O of the first wiring terminal and the second wiring terminal is grounded; the first wiring terminal and the second wiring terminal are respectively connected with a compensation reactor combination, and the tail end of the compensation reactor combination is grounded; the output end of the non-partial discharge exciting transformer T is connected with the low-voltage side of the tested low-voltage side double-winding transformer T1 so as to apply test voltage with preset frequency and amplitude on the low-voltage side of the tested low-voltage side double-winding transformer T1 for preset time;
the low-voltage side of the tested low-voltage side double-winding transformer T1 comprises 2 identical first low-voltage windings and second low-voltage windings; the wiring terminal of one phase winding of the first low-voltage winding is connected with the first wiring terminal of the partial discharge-free exciting transformer T, and the wiring terminals of the other 2 phases of windings of the first low-voltage winding are connected with each other; the neutral point connecting terminal n1 of the first low-voltage winding is connected with the connecting terminal of one phase winding of the second low-voltage winding; the connection terminals of the other 2-phase windings of the second low-voltage winding are connected with each other, and the neutral point connection terminal n2 of the second low-voltage winding is connected with the second connection terminal of the non-partial discharge exciting transformer T;
the tested phase bushing end screen wiring terminal of the high-voltage side of the tested low-voltage side double-winding transformer T1 is grounded through a detection impedance Z, the signal output end of the detection impedance is connected with the partial discharge detector F so as to read apparent discharge quantity of the tested phase, and the neutral point wiring terminal N of the high-voltage side of the tested low-voltage side double-winding transformer T1 is grounded.
The connection terminal a1 of the A-phase winding of the first low-voltage winding is connected with a first connection terminal of the output end of the partial discharge excitation transformer T, the connection terminal B1 of the B-phase winding of the first low-voltage winding and the connection terminal C1 of the C-phase winding are connected with each other, and the neutral point connection terminal n1 of the first low-voltage winding is connected with the connection terminal a2 of the A-phase winding of the second low-voltage winding;
the wiring terminal B2 of the B-phase winding of the second low-voltage winding is connected with the wiring terminal C2 of the C-phase winding, and the neutral point wiring terminal n2 of the second low-voltage winding is connected with the second wiring terminal of the output end of the partial discharge-free exciting transformer T.
The head end of the compensation reactor combination is connected with the first wiring end or the second wiring end of the non-partial discharge excitation transformer T, and the tail end of the compensation reactor combination is grounded; the compensation reactor combination comprises a plurality of compensation reactors L which are connected in series or in parallel.
And the A, B, C three-phase wiring terminals of the high-voltage side of the tested low-voltage side double-winding transformer T1 are additionally provided with anti-corona covers.
The beneficial effects of the invention are mainly shown in the following steps:
according to the invention, the two windings (the first low-voltage winding and the second low-voltage winding) of the low-voltage side double-winding transformer are pressurized in series, so that the equivalent inlet capacitance of the low-voltage side double-winding transformer is reduced to 1/4 of that of the conventional test mode, and the requirement of the partial discharge test on the capacity of test equipment is greatly reduced. And the partial discharge test of the transformer can be successfully completed on the premise of not increasing the test cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Description of the embodiments
Referring to the drawings, a wiring structure for partial discharge test of a low-voltage side double-winding transformer comprises a non-partial discharge variable-frequency power supply G, a non-partial discharge exciting transformer T, a tested low-voltage side double-winding transformer T1 and a partial discharge detector F;
the output end of the non-partial discharge frequency conversion power supply G is provided with a first wiring terminal and a second wiring terminal, and the middle O of the first wiring terminal and the second wiring terminal is grounded; the first wiring terminal and the second wiring terminal are respectively connected with a compensation reactor combination, and the tail end of the compensation reactor combination is grounded; the output end of the non-partial discharge exciting transformer T is connected with the low-voltage side of the tested low-voltage side double-winding transformer T1 so as to apply test voltage with preset frequency and amplitude on the low-voltage side of the tested low-voltage side double-winding transformer T1 for preset time;
the low-voltage side of the tested low-voltage side double-winding transformer T1 comprises 2 identical first low-voltage windings and second low-voltage windings; the wiring terminal of one phase winding of the first low-voltage winding is connected with the first wiring terminal of the partial discharge-free exciting transformer T, and the wiring terminals of the other 2 phases of windings of the first low-voltage winding are connected with each other; the neutral point connecting terminal of the first low-voltage winding is connected with the connecting terminal of one phase winding of the second low-voltage winding; the connecting terminals of the other 2-phase windings of the second low-voltage winding are connected with each other, and the neutral point connecting terminal of the second low-voltage winding is connected with the second connecting terminal of the non-partial discharge exciting transformer T;
the bushing end screen wiring terminal of the tested phase at the high voltage side of the tested low voltage side double winding transformer T1 is grounded through a detection impedance Z, the signal output end of the detection impedance Z is connected with the partial discharge detector F so as to read apparent discharge quantity of the tested phase, and the neutral point wiring terminal N at the high voltage side of the tested low voltage side double winding transformer T1 is grounded.
For example, when testing phase a, the bushing end screen terminal of phase a of the high-voltage side of the tested low-voltage side double-winding transformer T1 is grounded through the detection impedance Z, and phases B and C are grounded.
The connection terminal a1 of the A-phase winding of the first low-voltage winding is connected with a first connection terminal of the output end of the partial discharge excitation transformer T, the connection terminal B1 of the B-phase winding of the first low-voltage winding and the connection terminal C1 of the C-phase winding are connected with each other, and the neutral point connection terminal n1 of the first low-voltage winding is connected with the connection terminal a2 of the A-phase winding of the second low-voltage winding;
the wiring terminal B2 of the B-phase winding of the second low-voltage winding is connected with the wiring terminal C2 of the C-phase winding, and the neutral point wiring terminal n2 of the second low-voltage winding is connected with the second wiring terminal of the output end of the partial discharge-free exciting transformer T.
The head end of the compensation reactor combination is connected with the first wiring end or the second wiring end of the non-partial discharge excitation transformer T, and the tail end of the compensation reactor combination is grounded; the compensation reactor combination comprises a plurality of compensation reactors L which are connected in series or in parallel.
And A, B, C three-phase wiring terminals on the high-voltage side of the tested low-voltage side double-winding transformer T1 are additionally provided with anti-corona covers.
The partial discharge-free variable frequency power supply G is connected with the partial discharge-free exciting transformer T and then outputs in a balanced manner; the two non-partial discharge compensating reactors L are respectively connected to two sides of the output end of the non-partial discharge exciting transformer T; the neutral point connecting terminal n1 of the first low-voltage winding of the tested low-voltage side double-winding transformer T1 is connected with the connecting terminal a2 of the A-phase winding of the second low-voltage winding; the wiring terminal B1 of the B-phase winding and the wiring terminal C1 of the C-phase winding of the first low-voltage winding are short-circuited; the wiring terminal B2 of the B-phase winding and the wiring terminal C2 of the C-phase winding of the second low-voltage winding are in short circuit; the connection terminal a1 of the A-phase winding of the first low-voltage winding is connected with a first connection terminal of the output end of the non-partial discharge excitation transformer T, and the neutral point connection terminal n2 of the second low-voltage winding is connected with a second connection terminal of the output end of the non-partial discharge excitation transformer T so as to apply test voltage with preset frequency and amplitude on the low-voltage side winding for preset time.
The bushing end screen of the tested phase at the high voltage side of the tested low-voltage side double-winding transformer T1 is grounded through the detection impedance Z, and the bushing end screen of the non-tested phase is directly grounded. And the signal output end of the detection impedance Z is connected with the partial discharge detector F so as to read the apparent discharge quantity of the tested phase.
When the partial discharge test is performed on the tested low-voltage side double-winding transformer T1, a test voltage with preset frequency and amplitude is applied to the low-voltage side of the tested low-voltage side double-winding transformer T1, the frequency of the test voltage is generally frequency multiplication of 50Hz or other suitable frequencies, the amplitude of the test voltage is determined according to the voltage required to be applied to the tested phase winding of the tested transformer, and the preset time is determined according to the time specified in the process of performing the partial discharge test on the transformer according to the national standard.
When the wiring structure is adopted to carry out partial discharge test on the high-capacity high-transformation-ratio low-voltage side double-winding transformer, the variable frequency power supply is used for generating corresponding test voltage to be applied to the low-voltage side winding of the tested low-voltage side double-winding transformer T1, the compensation reactor Z is used for compensating reactive current required by the test, so that the purpose of reducing the capacity of test equipment is achieved, at the moment, induced voltage is generated on the high-voltage side winding of the tested low-voltage side double-winding transformer T1, and when the voltage on a certain tested phase winding on the high-voltage side reaches a voltage value required by the partial discharge test, the test time is maintained.
The method comprises the steps that a detected impedance Z is connected to a high-voltage side detected phase sleeve end screen of a detected low-voltage side double-winding transformer T1, the detected impedance Z comprises a signal input end, a tail end and a signal output end, the signal input end of the detected impedance Z is connected with the sleeve end screen, the tail end of the detected impedance Z is grounded, the signal output end of the detected impedance Z is connected with a partial discharge detector F, a discharge signal is input into the partial discharge detector F through the signal output end of the detected impedance Z, and the partial discharge detector F directly displays the apparent discharge quantity of the detected phase. And judging whether the tested phase meets the insulation requirement according to the obtained apparent discharge quantity.
According to the technical scheme, the wiring structure can be used for carrying out partial discharge test on the high-capacity high-transformation-ratio low-voltage side double-winding transformer, and measuring the apparent discharge quantity of the tested phase of the tested transformer so as to find out whether the tested phase of the tested transformer has serious discharge phenomenon or not, judge whether the tested phase meets insulation requirements and meet the requirements of partial discharge experiments on the transformer.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (4)
1. A wiring structure for partial discharge test of a low-voltage side double-winding transformer is characterized in that: the device comprises a non-partial discharge variable frequency power supply (G), a non-partial discharge exciting transformer (T), a tested low-voltage side double-winding transformer (T1) and a partial discharge detector (F);
the output end of the non-partial discharge variable frequency power supply (G) is provided with a first wiring terminal and a second wiring terminal, and the middle (O) of the first wiring terminal and the second wiring terminal is grounded; the first wiring terminal and the second wiring terminal are respectively connected with a compensation reactor combination, and the tail end of the compensation reactor combination is grounded; the output end of the non-partial discharge exciting transformer (T) is connected with the low-voltage side of the tested low-voltage side double-winding transformer (T1) so as to apply test voltage with preset frequency and amplitude on the low-voltage side of the tested low-voltage side double-winding transformer (T1) for preset time;
the low-voltage side of the tested low-voltage side double-winding transformer (T1) comprises 2 identical first low-voltage windings and second low-voltage windings; the wiring terminal of one phase winding of the first low-voltage winding is connected with the first wiring terminal of the partial discharge-free exciting transformer (T), and the wiring terminals of the other 2 phases of windings of the first low-voltage winding are connected with each other; the neutral point connecting terminal (n 1) of the first low-voltage winding is connected with the connecting terminal of one phase winding of the second low-voltage winding; the connection terminals of the other 2-phase windings of the second low-voltage winding are connected with each other, and the neutral point connection terminal (n 2) of the second low-voltage winding is connected with the second connection terminal of the no-partial-discharge exciting transformer (T);
the tested phase bushing end screen wiring terminal of the high-voltage side of the tested low-voltage side double-winding transformer (T1) is grounded through a detection impedance (Z), the signal output end of the detection impedance is connected with the partial discharge detector (F) so as to read apparent discharge quantity of the tested phase, and the neutral point wiring terminal (N) of the high-voltage side of the tested low-voltage side double-winding transformer (T1) is grounded.
2. A wiring structure for a partial discharge test of a low-voltage side double-winding transformer as claimed in claim 1, wherein: the connection terminal (a 1) of the A-phase winding of the first low-voltage winding is connected with a first connection terminal of the output end of the partial discharge-free exciting transformer (T), the connection terminal (B1) of the B-phase winding of the first low-voltage winding is connected with the connection terminal (C1) of the C-phase winding, and the neutral point connection terminal (n 1) of the first low-voltage winding is connected with the connection terminal (a 2) of the A-phase winding of the second low-voltage winding;
the wiring terminal (B2) of the B-phase winding of the second low-voltage winding is connected with the wiring terminal (C2) of the C-phase winding, and the neutral point wiring terminal (n 2) of the second low-voltage winding is connected with the second wiring terminal of the output end of the partial discharge-free exciting transformer (T).
3. A wiring structure for a partial discharge test of a low-voltage side double-winding transformer as claimed in claim 1 or 2, characterized in that: the head end of the compensation reactor combination is connected with a first wiring terminal or a second wiring terminal of the non-partial discharge excitation transformer (T), and the tail end of the compensation reactor combination is grounded; the compensation reactor combination comprises a plurality of compensation reactors (L) which are connected in series or in parallel.
4. A wiring structure for a partial discharge test of a low-voltage side double-winding transformer as claimed in claim 3, wherein: and the A, B, C three-phase wiring terminals of the high-voltage side of the tested low-voltage side double-winding transformer (T1) are additionally provided with anti-corona covers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710196788.1A CN107037333B (en) | 2017-03-29 | 2017-03-29 | Wiring structure for partial discharge test of low-voltage side double-winding transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710196788.1A CN107037333B (en) | 2017-03-29 | 2017-03-29 | Wiring structure for partial discharge test of low-voltage side double-winding transformer |
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| CN107037333A CN107037333A (en) | 2017-08-11 |
| CN107037333B true CN107037333B (en) | 2023-06-02 |
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| CN111123050B (en) * | 2019-12-31 | 2022-06-10 | 中国能源建设集团华东电力试验研究院有限公司 | Transformer partial discharge test device for transformer and GIS in GIL connection mode |
| CN113466637A (en) * | 2021-06-08 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Phase synchronization measurement method, device and system for partial discharge of transformer |
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| CN103258626A (en) * | 2013-04-16 | 2013-08-21 | 山东达驰电气有限公司 | Two-winding testing transformer self-coupling wiring method and application thereof |
| CN104820172A (en) * | 2015-04-16 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Three-phase transformer impulse withstand voltage test method |
| CN206920546U (en) * | 2017-03-29 | 2018-01-23 | 中国能源建设集团浙江火电建设有限公司 | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633168B2 (en) * | 2001-03-30 | 2003-10-14 | Square D Company | Method and apparatus for detecting partial discharge in a voltage transformer |
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- 2017-03-29 CN CN201710196788.1A patent/CN107037333B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103258626A (en) * | 2013-04-16 | 2013-08-21 | 山东达驰电气有限公司 | Two-winding testing transformer self-coupling wiring method and application thereof |
| CN104820172A (en) * | 2015-04-16 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Three-phase transformer impulse withstand voltage test method |
| CN206920546U (en) * | 2017-03-29 | 2018-01-23 | 中国能源建设集团浙江火电建设有限公司 | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test |
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