CN107037333A - A kind of wiring construction of low-pressure side two-winding transformer partial discharge test - Google Patents
A kind of wiring construction of low-pressure side two-winding transformer partial discharge test Download PDFInfo
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- CN107037333A CN107037333A CN201710196788.1A CN201710196788A CN107037333A CN 107037333 A CN107037333 A CN 107037333A CN 201710196788 A CN201710196788 A CN 201710196788A CN 107037333 A CN107037333 A CN 107037333A
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- winding
- low
- partial discharge
- binding post
- transformer
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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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of wiring construction of low-pressure side two-winding transformer partial discharge test, the first terminals of no partial discharge exciting transformer and the middle ground of the second terminals；Compensation reactor combination is respectively connected with first terminals and the second terminals；The wherein binding post of a phase winding of first low pressure winding is connected with the first terminals without partial discharge exciting transformer, and the binding post of other 2 phase winding of the first low pressure winding is connected with each other；The neutral point binding post of first low pressure winding is connected with the binding post of a wherein phase winding for the second low pressure winding；The binding post of other 2 phase winding of second low pressure winding is connected with each other, and the neutral point binding post of the second low pressure winding is connected with the second terminals without partial discharge exciting transformer；It is tested the on high-tension side subject phase bottom shielding of bushing binding post impedance earth, and detect that impedance is connected with Partial discharge detector after testing of low-pressure side two-winding transformer.
Description
Technical field
The present invention relates to a kind of wiring construction of low-pressure side two-winding transformer partial discharge test.
Background technology
In recent years, it is cost of reducing investment outlay, big power station generally only designs a startup spare transformer.The type becomes
Depressor structure is special, there is the doublewound feature of Large Copacity, large velocity ratio, low-pressure side.When carrying out partial discharge test, due to height
The capacity current of winding is pressed to be coupled to pressure side by no-load voltage ratio, and pressure side is due to wiring group, test voltage is general
Than relatively low, so that the excessive capacity for having exceeded testing equipment of the reactive current of transformer pressure side, debugging unit is routinely set
Standby configuration is difficult to meet test requirements document.
Transformer is in During Process of Long-term Operation, and under high field intensity effect office can occur for some weak parts of its built-in electrical insulation
Portion discharges, so as to cause decreasing insulating, under serious shelf depreciation long term, or even causes puncturing for transformer,
Therefore, transformer particularly safely and reliably operation of the EHV transformer under long-term work voltage is influenceed.
GB50150《Electrical equipment commissioning test standard》Middle regulation, voltage class 220kV and above transformer are pacified newly
During dress, Partial Discharge Testing on Site should be carried out.
The content of the invention
It is an object of the invention to the deficiency for overcoming prior art, there is provided a kind of low-pressure side two-winding transformer shelf depreciation
The wiring construction of experiment.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of wiring construction of low-pressure side two-winding transformer partial discharge test, it is characterised in that：Including becoming without partial discharge
Frequency power), without partial discharge exciting transformer T, subject low-pressure side two-winding transformer T1 and Partial discharge detector F；
The no partial discharge frequency conversion power supply G is connected with the input without partial discharge exciting transformer T, described without partial discharge excitation transformation
Device T output has the first terminals and the second wiring using symmetrical output, the output end without partial discharge exciting transformer T
End, and the middle O ground connection of the first terminals and the second terminals；It is respectively connected with first terminals and the second terminals
Compensation reactor is combined, and the tail end ground connection of compensation reactor combination；The output end without partial discharge exciting transformer T with
The low-pressure side of the subject low-pressure side two-winding transformer T1 is connected, with the low of the subject low-pressure side two-winding transformer T1
Press and apply predeterminated frequency and the test voltage of amplitude on side, and continue preset time；
The low-pressure side of the subject low-pressure side two-winding transformer T1 includes 2 identical first low pressure windings and the
Two low pressure windings；The wherein binding post of a phase winding of first low pressure winding with it is described without partial discharge exciting transformer T's
First terminals are connected, and the binding post of other 2 phase winding of first low pressure winding is connected with each other；First low pressure around
The neutral point binding post n1 of group is connected with the binding post of a wherein phase winding for second low pressure winding；Described second is low
The binding post of other 2 phase winding of winding is pressed to be connected with each other, the neutral point binding post n2 of second low pressure winding and institute
The second terminals for stating no partial discharge exciting transformer T are connected；
The on high-tension side subject phase bottom shielding of bushing binding post of the subject low-pressure side two-winding transformer T1 hinders after testing
Anti- Z is grounded, and the signal output part of the detection impedance is connected with the Partial discharge detector F, to read the subject phase
Apparent discharge magnitude, and the on high-tension side neutral point binding post N ground connection of the subject low-pressure side two-winding transformer T1.
The binding post a1 of the A phase windings of first low pressure winding and the output end without partial discharge exciting transformer T
The first terminals be connected, the binding post c1 phases of binding post b1 and the C phase winding of the B phase windings of first low pressure winding
Connect, the neutral point binding post n1 of first low pressure winding and the A phase windings of second low pressure winding terminals
Sub- a2 is connected with each other；
The binding post b2 of the B phase windings of second low pressure winding is connected with the binding post c2 of C phase windings, and described
The neutral point binding post n2 of two low pressure windings is connected with second terminals without partial discharge exciting transformer T output ends.
The head end of the compensation reactor combination and first terminals without partial discharge exciting transformer T or the second wiring
End is connected, and the tail end ground connection of compensation reactor combination；The compensation reactor combination includes the benefit of some serial or parallel connections
Repay reactor L.
The compensation reactor combination includes a compensation reactor L.
The binding post of on high-tension side A, B, C three-phase of the subject low-pressure side two-winding transformer T1 adds anti-corona
Cover.
Beneficial effects of the present invention are mainly manifested in：
The present invention passes through two windings (the first low pressure winding and second by low-pressure side two-winding transformer low-pressure side is tested
Low pressure winding) series pressurized so that the subject equivalent entrance capacitance of low-pressure side two-winding transformer low-pressure side has been down to routine test
1/4 under mode, greatly reduce requirement of the partial discharge test to testing equipment capacity.And before experimentation cost is not increased
Put, you can smoothly complete the partial discharge test of the type transformer.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
Referring to the drawings, a kind of wiring construction of low-pressure side two-winding transformer partial discharge test, including no partial discharge frequency conversion
Power supply G, without partial discharge exciting transformer T, subject low-pressure side two-winding transformer T1 and Partial discharge detector F；
The no partial discharge frequency conversion power supply G is connected with the input without partial discharge exciting transformer T, described without partial discharge excitation transformation
Device T output has the first terminals and the second wiring using symmetrical output, the output end without partial discharge exciting transformer T
End, and the middle O ground connection of the first terminals and the second terminals；First terminals and the second terminals are respectively connected with
Compensation reactor is combined, and the tail end ground connection of compensation reactor combination；The output end without partial discharge exciting transformer T with
The low-pressure side of the subject low-pressure side two-winding transformer T1 is connected, with the low of the subject low-pressure side two-winding transformer T1
Press and apply predeterminated frequency and the test voltage of amplitude on side, and continue preset time；
The low-pressure side of the subject low-pressure side two-winding transformer T1 includes 2 identical first low pressure windings and the
Two low pressure windings；The wherein binding post of a phase winding of first low pressure winding with it is described without partial discharge exciting transformer T's
First terminals are connected, and the binding post of other 2 phase winding of first low pressure winding is connected with each other；First low pressure around
The neutral point binding post of group is connected with the binding post of a wherein phase winding for second low pressure winding；Second low pressure
The binding post of other 2 phase winding of winding is connected with each other, neutral point binding post and the nothing of second low pressure winding
Partial discharge exciting transformer T the second terminals are connected；
The bottom shielding of bushing binding post of the on high-tension side subject phase of the subject low-pressure side two-winding transformer T1 is after testing
Impedance Z is grounded, and the signal output part of the detection impedance Z is connected with the Partial discharge detector F, to read the subject
The Apparent discharge magnitude of phase, and the on high-tension side neutral point binding post N ground connection of the subject low-pressure side two-winding transformer T1.
For example, when testing A phases, the bottom shielding of bushing of the on high-tension side A phases of the subject low-pressure side two-winding transformer T1
Impedance Z is grounded binding post after testing, and its B phase, C phases are grounded.
The binding post a1 of the A phase windings of first low pressure winding and the output end without partial discharge exciting transformer T
The first terminals be connected, the binding post c1 phases of binding post b1 and the C phase winding of the B phase windings of first low pressure winding
Connect, the neutral point binding post n1 of first low pressure winding and the A phase windings of second low pressure winding terminals
Sub- a2 is connected with each other；
The binding post b2 of the B phase windings of second low pressure winding is connected with the binding post c2 of C phase windings, and described
The neutral point binding post n2 of two low pressure windings is connected with second terminals without partial discharge exciting transformer T output ends.
The head end of the compensation reactor combination and first terminals without partial discharge exciting transformer T or the second wiring
End is connected, and the tail end ground connection of compensation reactor combination；The compensation reactor combination includes the benefit of some serial or parallel connections
Repay reactor L.
The compensation reactor combination includes a compensation reactor L.
On high-tension side A, B, C three-phase terminal of the subject low-pressure side two-winding transformer T1 adds anti-corona
Cover.
The no partial discharge frequency conversion power supply G be connected without partial discharge exciting transformer T after Differential Output；Two compensate electricity without partial discharge
Anti- device L is respectively connected to the both sides of no partial discharge exciting transformer T output ends；Be tested the first low pressure of low-pressure side two-winding transformer T1 around
The neutral point binding post n1 of group is connected with the binding post a2 of the A phase windings of the second low pressure winding；The B of first low pressure winding
The binding post c1 short circuits of binding post b1 and the C phase winding of phase winding；The terminals of the B phase windings of second low pressure winding
The binding post c2 short circuits of sub- b2 and C phase windings；The binding post a1 of the A phase windings of first low pressure winding with it is described without office
The first terminals for putting exciting transformer T output end are connected, the neutral point binding post n2 of second low pressure winding and institute
The second terminals for stating no partial discharge exciting transformer T output ends are connected, to apply predeterminated frequency and amplitude on low-pressure side winding
Test voltage, and continue preset time.
Impedance Z connects the bottom shielding of bushing of the on high-tension side subject phase of the subject low-pressure side two-winding transformer T1 after testing
Ground, the bottom shielding of bushing of non-subject phase is directly grounded.The signal output part and the Partial discharge detector F of the detection impedance Z
Connection, to read the Apparent discharge magnitude of the subject phase.
When carrying out partial discharge test to the subject low-pressure side two-winding transformer T1, in subject low-pressure side double winding
Transformer T1 low-pressure side applies predeterminated frequency and the test voltage of amplitude, and the frequency of the test voltage is typically using 50Hz times
Frequency or other suitable frequencies, the voltage that the amplitude of test voltage applies according to needed for subject transformer subject phase winding determines,
Preset time according to national standard to transformer carry out partial discharge test during as defined in the time determination.
Shelf depreciation is carried out to Large Copacity large velocity ratio low-pressure side two-winding transformer using wiring construction of the present invention
During experiment, variable-frequency power sources is used to produce corresponding test voltage, to be applied to subject low-pressure side two-winding transformer T1 low pressure
On the winding of side, the reactive current that compensation reactor Z is used for needed for complementation test, so as to reach the mesh of reduction testing equipment capacity
, now, induced voltage will be produced on subject low-pressure side two-winding transformer T1 high-pressure side winding, this is on high-tension side a certain
When voltage on subject phase winding reaches the magnitude of voltage required by partial discharge test, test period is maintained.
The connecting detection impedance Z on subject low-pressure side two-winding transformer T1 high-pressure side subject phase bottom shielding of bushing, it is described
Detect that impedance Z includes signal input part, tail end and signal output part, the signal input part and bottom shielding of bushing phase of impedance Z will be detected
Connection, the tail end ground connection of detection impedance Z, the signal output part of detection impedance Z is connected with Partial discharge detector F, discharge signal
By detecting that the signal output part of impedance Z inputs Partial discharge detector F, Partial discharge detector F will directly display the subject
The Apparent discharge magnitude of phase.It can determine whether whether the subject mutually meets insulating requirements according to the size of obtained Apparent discharge magnitude.
As shown from the above technical solution, can be double to Large Copacity large velocity ratio low-pressure side using wiring construction of the present invention
Winding transformer carries out partial discharge test, and measurement subject transformer is tested the Apparent discharge magnitude of phase, to find out subject transformation
Device subject mutually whether there is serious electric discharge phenomena, judge whether subject mutually meets insulating requirements, and satisfaction is locally put to transformer
The requirement of electricity experiment.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (5)
1. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test, it is characterised in that：Including no partial discharge frequency conversion
Power supply (G), without partial discharge exciting transformer (T), subject low-pressure side two-winding transformer (T1) and Partial discharge detector (F)；
The no partial discharge frequency conversion power supply (G) is connected with the input without partial discharge exciting transformer (T), described without partial discharge excitation transformation
The output of device (T) using symmetrical output, the output end without partial discharge exciting transformer (T) there are the first terminals and second to connect
Line end, and centre (O) ground connection of the first terminals and the second terminals；Each connect on first terminals and the second terminals
It is connected to compensation reactor combination, and the tail end ground connection of compensation reactor combination；It is described without the defeated of partial discharge exciting transformer (T)
The low-pressure side for going out end with the subject low-pressure side two-winding transformer (T1) is connected, with the subject low-pressure side double winding transformation
Apply predeterminated frequency and the test voltage of amplitude in the low-pressure side of device (T1), and continue preset time；
The low-pressure side of the subject low-pressure side two-winding transformer (T1) includes 2 identical first low pressure windings and second
Low pressure winding；The wherein binding post of a phase winding of first low pressure winding is with described without partial discharge exciting transformer (T)
First terminals are connected, and the binding post of other 2 phase winding of first low pressure winding is connected with each other；First low pressure around
The neutral point binding post (n1) of group is connected with the binding post of a wherein phase winding for second low pressure winding；Described second
The binding post of other 2 phase winding of low pressure winding is connected with each other, the neutral point binding post (n2) of second low pressure winding
It is connected with second terminals without partial discharge exciting transformer (T)；
The on high-tension side subject phase bottom shielding of bushing binding post impedance after testing of the subject low-pressure side two-winding transformer (T1)
(Z) it is grounded, and the signal output part of the detection impedance is connected with the Partial discharge detector (F), to read the subject
The Apparent discharge magnitude of phase, and it is described subject low-pressure side two-winding transformer (T1) on high-tension side neutral point binding post (N) connect
Ground.
2. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test as claimed in claim 1, its feature exists
In：The binding post (a1) of the A phase windings of first low pressure winding and the output end without partial discharge exciting transformer (T)
First terminals are connected, the binding post (b1) of the B phase windings of first low pressure winding and the binding post (c1) of C phase windings
It is connected with each other, the neutral point binding post (n1) of first low pressure winding and connecing for the A phase windings of second low pressure winding
Line terminals (a2) are connected with each other；
The binding post (b2) of the B phase windings of second low pressure winding is connected with the binding post (c2) of C phase windings, and described
The neutral point binding post (n2) of two low pressure windings and the second terminals phase without partial discharge exciting transformer (T) output end
Even.
3. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test as claimed in claim 1 or 2, its feature
It is：The head end of the compensation reactor combination and first terminals without partial discharge exciting transformer (T) or the second wiring
End is connected, and the tail end ground connection of compensation reactor combination；The compensation reactor combination includes the benefit of some serial or parallel connections
Repay reactor (L).
4. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test as claimed in claim 3, its feature exists
In：The compensation reactor combination includes a compensation reactor (L).
5. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test as claimed in claim 4, its feature exists
In：The binding post of on high-tension side A, B, C three-phase of the subject low-pressure side two-winding transformer (T1) adds anti-corona cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196788.1A CN107037333B (en) | 2017-03-29 | 2017-03-29 | Wiring structure for partial discharge test of low-voltage side double-winding transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196788.1A CN107037333B (en) | 2017-03-29 | 2017-03-29 | Wiring structure for partial discharge test of low-voltage side double-winding transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107037333A true CN107037333A (en) | 2017-08-11 |
| CN107037333B CN107037333B (en) | 2023-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710196788.1A Active 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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| Country | Link |
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| CN (1) | CN107037333B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123050A (en) * | 2019-12-31 | 2020-05-08 | 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 of 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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| US20020140536A1 (en) * | 2001-03-30 | 2002-10-03 | Hopkinson Philip J. | Method and apparatus for detecting partial discharge in a voltage transformer |
| 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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2017
- 2017-03-29 CN CN201710196788.1A patent/CN107037333B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020140536A1 (en) * | 2001-03-30 | 2002-10-03 | Hopkinson Philip J. | Method and apparatus for detecting partial discharge in a voltage transformer |
| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123050A (en) * | 2019-12-31 | 2020-05-08 | 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 of transformer and GIS in GIL connection mode |
| 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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| Publication number | Publication date |
|---|---|
| CN107037333B (en) | 2023-06-02 |
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