CN206920546U - 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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- CN206920546U CN206920546U CN201720319906.9U CN201720319906U CN206920546U CN 206920546 U CN206920546 U CN 206920546U CN 201720319906 U CN201720319906 U CN 201720319906U CN 206920546 U CN206920546 U CN 206920546U
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- winding
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- partial discharge
- binding post
- transformer
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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 impedance and be connected with Partial discharge detector after testing of low-pressure side two-winding transformer.
Description
Technical field
It the utility model is related 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, the doublewound feature of Large Copacity, large velocity ratio, low-pressure side be present.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 are routinely set
Standby configuration is difficult to meet test requirements document.
In During Process of Long-term Operation, under high field intensity effect office can occur transformer for some weak parts of its built-in electrical insulation
Portion discharges, and so as to cause decreasing insulating, under serious shelf depreciation long term, or even causes the breakdown of transformer,
Therefore, safely and reliably operation of the transformer particularly EHV transformer under long-term work voltage is influenceed.
GB50150《Electrical equipment commissioning test standard》Middle regulation, voltage class 220kV and above transformer are installed newly
When, Partial Discharge Testing on Site should be carried out.
The content of the invention
The purpose of this utility model is the deficiency for overcoming prior art, there is provided a kind of low-pressure side two-winding transformer is local
The wiring construction of discharge test.
To achieve the above object, the utility model adopts 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, the no partial discharge excitation transformation
Device T output has the first terminals and the second wiring using symmetrical output, the output end of the no partial discharge exciting transformer T
End, and the middle O of the first terminals and the second terminals is grounded；It is respectively connected with first terminals and the second terminals
Compensation reactor combines, and the tail end ground connection of compensation reactor combination；The output end of the no 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 is with the no 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 ground connection, 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 no partial discharge exciting transformer T output end
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 the second terminals of the no partial discharge exciting transformer T output ends.
First terminals or second wiring of the head end of the compensation reactor combination with the no partial discharge exciting transformer T
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.
The beneficial effects of the utility model are mainly manifested in：
The utility model by by be tested low-pressure side two-winding transformer low-pressure side two windings (the first low pressure winding and
Second 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
1/4 under test method, greatly reduce requirement of the partial discharge test to testing equipment capacity.And do not increasing experimentation cost
On the premise of, you can smoothly complete the partial discharge test of the type transformer.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
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, the no partial discharge excitation transformation
Device T output has the first terminals and the second wiring using symmetrical output, the output end of the no partial discharge exciting transformer T
End, and the middle O of the first terminals and the second terminals is grounded；First terminals and the second terminals each connect
There are compensation reactor combination, and the tail end ground connection of compensation reactor combination；The output end of the no partial discharge exciting transformer T
It is connected with the low-pressure side of the subject low-pressure side two-winding transformer T1, with the subject low-pressure side two-winding transformer T1's
Apply predeterminated frequency and the test voltage of amplitude in low-pressure 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 is with the no 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 no partial discharge exciting transformer T output end
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 the second terminals of the no partial discharge exciting transformer T output ends.
First terminals or second wiring of the head end of the compensation reactor combination with the no partial discharge exciting transformer T
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 phases of first low pressure winding
The binding post c1 short circuits of binding post b1 and the C phase winding of winding；The binding post of the B phase windings of second low pressure winding
The binding post c2 short circuits of b2 and C phase windings；The binding post a1 of the A phase windings of first low pressure winding and the no partial discharge
First terminals of exciting transformer T output end are connected, the neutral point binding post n2 of second low pressure winding with it is described
The second terminals without 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 are 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's
Frequency multiplication or other suitable frequencies, the voltage that the amplitude of test voltage applies according to needed for subject transformer subject phase winding are true
Fixed, preset time carries out defined time determination during partial discharge test according to national standard to transformer.
Large Copacity large velocity ratio low-pressure side two-winding transformer is carried out using wiring construction described in the utility model local
During discharge test, variable-frequency power sources is used to produce corresponding test voltage, to be applied to subject low-pressure side two-winding transformer T1's
On low-pressure side winding, compensation reactor Z is used for the reactive current needed for complementation test, and testing equipment capacity is reduced so as to reach
Purpose, now, will subject low-pressure side two-winding transformer T1 high-pressure side winding on produce induced voltage, this it is on high-tension side certain
When voltage on one 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
Detection impedance Z includes signal input part, tail end and signal output part, will detect the signal input part and bottom shielding of bushing phase of impedance Z
Connection, the tail end ground connection of impedance Z is detected, the signal output part for detecting impedance Z is connected with Partial discharge detector F, discharge signal
Partial discharge detector F is inputted by the signal output part for detecting impedance Z, Partial discharge detector F will directly display the subject
The Apparent discharge magnitude of phase.It can determine 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 to Large Copacity large velocity ratio low pressure using wiring construction described in the utility model
Side two-winding transformer carries out partial discharge test, the Apparent discharge magnitude of measurement subject transformer subject phase, to find out subject
Transformer subject mutually whether there is serious electric discharge phenomena, judge whether subject mutually meets insulating requirements, meet to transformer partial
The requirement of portion's discharge test.
Content described in this specification embodiment is only enumerating to the way of realization of utility model design, and this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, the scope of protection of the utility model also and
In those skilled in the art according to the utility model design it is conceivable that equivalent technologies mean.
Claims (5)
- A kind of 1. 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), the no partial discharge excitation transformation The output of device (T) using symmetrical output, the output end of the no partial discharge exciting transformer (T) there are the first terminals and second to connect Line end, and the centre of the first terminals and the second terminals (O) is grounded；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；The no partial discharge exciting transformer (T) it is defeated 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 and the no 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 the second terminals of the no 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 the on high-tension side neutral point binding post (N) of the subject low-pressure side two-winding transformer (T1) connects Ground.
- 2. a kind of wiring construction of low-pressure side two-winding transformer partial discharge test as claimed in claim 1, its feature exist In：The binding post (a1) of the A phase windings of first low pressure winding and the output end of the no 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 of no 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：First terminals or second wiring of the head end of the compensation reactor combination with the no partial discharge exciting transformer (T) 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 exist 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 exist 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 |
|---|---|---|---|
| CN201720319906.9U CN206920546U (en) | 2017-03-29 | 2017-03-29 | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720319906.9U CN206920546U (en) | 2017-03-29 | 2017-03-29 | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206920546U true CN206920546U (en) | 2018-01-23 |
Family
ID=61310740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720319906.9U Withdrawn - After Issue CN206920546U (en) | 2017-03-29 | 2017-03-29 | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206920546U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037333A (en) * | 2017-03-29 | 2017-08-11 | 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 |
| 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 |
-
2017
- 2017-03-29 CN CN201720319906.9U patent/CN206920546U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037333A (en) * | 2017-03-29 | 2017-08-11 | 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 |
| CN107037333B (en) * | 2017-03-29 | 2023-06-02 | 中国能源建设集团浙江火电建设有限公司 | Wiring structure for partial discharge test of low-voltage side double-winding transformer |
| 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 |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180123 Effective date of abandoning: 20230602 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180123 Effective date of abandoning: 20230602 |