CN207457285U - A kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment - Google Patents
A kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment Download PDFInfo
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- CN207457285U CN207457285U CN201721381337.7U CN201721381337U CN207457285U CN 207457285 U CN207457285 U CN 207457285U CN 201721381337 U CN201721381337 U CN 201721381337U CN 207457285 U CN207457285 U CN 207457285U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model is related to a kind of transformer low-voltage short-circuit impedances to test short-circuit wire connection structure.Including being used to for short-circuit copper wire to be fixed on first clamp, the second clamp at transformer lead, and the short-circuit copper wire of connection first clamp and second clamp, the head end of wherein short-circuit copper wire is connected with first clamp, the end of short-circuit copper wire is connected with second clamp, the first clamp, second clamp and short-circuit copper wire junction are both provided with threaded hole, the middle part of the short circuit copper wire and offer the first perforate, the second perforate along the head end of short-circuit copper wire to end direction is spaced.The utility model can both meet the requirement of short-circuit resistance, while can the practical transformer with different voltages grade.
Description
Technical field
The utility model belongs to substation equipment maintenance and repair electrical test field in electric system, and in particular to a kind of transformer low-voltage
The short-circuit wire connection structure of short-circuit impedance experiment.
Background technology
Transformer low-voltage short-circuit impedance test connection such as Fig. 1（By taking single-phase transformer as an example）, by step down side ab
Short circuit is pressed by high pressure and surveys AB input low-voltages（General 220V or so）, electric current is measured from high-pressure side, so as to calculate the transformer
Low-voltage short-circuit impedance value.Ideally, low-pressure side ab short-circuit resistances are 0, but during practical operation, usually due to short circuit not
It is good, cause result of the test deviation larger.
At present, the mode short circuit low-pressure side of bare copper wire winding is commonly used in practice.It is if easily solid using thinner bare copper wire
It is fixed, but the resistance of fine copper wire is big；If using thicker bare copper wire, copper wire resistance is small, but does not allow to be fixed easily.Two ways is required to
More copper wire are wound to reduce short-circuit resistance.
There are shortcoming and deficiencies for the prior art：
1. by the way of bare copper wire winding, it is not easy to which fixed, contact resistance is larger.
2. for the transformer of different voltages grade, low-pressure side spacing is different, and the bare copper wire length difference used is, it is necessary to standby
The bare copper wire of different length and thickness lacks versatility.
The content of the invention
The purpose of this utility model is to provide a kind of transformer low-voltage short-circuit impedances to test short-circuit wire connection structure, both
The requirement of short-circuit resistance can be met, while can the practical transformer with different voltages grade.
To achieve the above object, the technical solution of the utility model is：A kind of transformer low-voltage short-circuit impedance experiment is short
Route connection structure, including being used to for short-circuit copper wire to be fixed on first clamp, second clamp and the connection at transformer lead
The short-circuit copper wire of first clamp and second clamp, wherein the head end of short-circuit copper wire is connected with first clamp, the end of short-circuit copper wire
It is connected with second clamp, the first clamp, second clamp and short-circuit copper wire junction are both provided with threaded hole, the short circuit copper
The middle part of line and offer the first perforate, the second perforate along the head end of short-circuit copper wire to end direction is spaced.
In one embodiment of the utility model, when the transformer progress low-voltage for 750kV and above is short
During the impedance experiments of road, first clamp, second clamp are directly clamped into low-pressure side both ends terminal；When for 500kV and following electricity
When the transformer of grade being pressed to carry out the experiment of low-voltage short-circuit impedance, the spiral shell of second clamp is fixed in the first perforate of short-circuit copper wire
At pit, the second perforate of short-circuit copper wire is fixed at the threaded hole of first clamp, then presss from both sides first clamp, second clamp
Firmly low-pressure side both ends terminal.
In one embodiment of the utility model, the short circuit copper wire length is 2m, the head end of short-circuit copper wire to the first perforate
For distance for 0.6m, the first perforate to the second perforate distance of short-circuit copper wire is 0.7m, the second perforate of short-circuit copper wire to short-circuit copper
The end distance of line is 0.7m.
In one embodiment of the utility model, the first clamp, second clamp are full copper clip.
Compared to the prior art, the utility model has the advantages that：
1st, short-circuit line, contact resistance smaller are fixed by clip；
2nd, by the cross-fixing of lead and short-circuit resistance is reduced, while the transformer of different voltages grade can be met
The spacing needed when short-circuit.
Description of the drawings
Fig. 1 is transformer low-voltage short-circuit impedance test connection figure.
Fig. 2 is one example structure schematic diagram of the utility model.
When Fig. 3 is that Fig. 2 structures carry out the experiment of low-voltage short-circuit impedance for 500kV and the transformer of following voltage class
Malformation schematic diagram.
Specific embodiment
The technical solution of the utility model is specifically described in 2-3 below in conjunction with the accompanying drawings.
The short-circuit wire connection structure of a kind of transformer low-voltage short-circuit impedance experiment of the utility model, including being used for short circuit
Copper wire is fixed on first clamp, second clamp and the short-circuit copper of connection first clamp and second clamp at transformer lead
Line, wherein the head end of short-circuit copper wire is connected with first clamp, the end of short-circuit copper wire is connected with second clamp, first folder
Son, second clamp and short-circuit copper wire junction are both provided with threaded hole, the middle part of the short circuit copper wire and along the head of short-circuit copper wire
End offers the first perforate, the second perforate to end direction is spaced.
When the transformer for 750kV and above carries out the experiment of low-voltage short-circuit impedance, directly by first
Clip, second clamp clamp low-pressure side both ends terminal；When for 500kV and the transformer of following voltage class progress low-voltage
When short-circuit impedance is tested, the first perforate of short-circuit copper wire is fixed at the threaded hole of second clamp, by the second of short-circuit copper wire
Perforate is fixed at the threaded hole of first clamp, and first clamp, second clamp then are clamped low-pressure side both ends terminal.
The short circuit copper wire length is 2m, and head end to the first perforate distance of short-circuit copper wire is 0.6m, the of short-circuit copper wire
One perforate to the second perforate distance is 0.7m, the end distance of the second perforate to the short-circuit copper wire of short-circuit copper wire is 0.7m.
The first clamp, second clamp are full copper clip.
It is specific embodiment of the utility model below.
As shown in Fig. 2, a kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment of the utility model, wherein
1 is clip, and for short-circuit line to be fixed at transformer lead, since clip has stronger biting force, therefore contact resistance is smaller, folder
Son is full copper material, is connected between two clips with copper wire（At A to D）；2 for threaded hole with can fixed screw rod manually；3 are in copper
It is punched on line.The screw hole that can go out by 2 is fixed on 3 at 2 with screw rod.The a length of 2m of wherein AD, AB length be 0.6m, BC length
For 0.7m, a length of 0.7m of CD.
In the transformer to 750kV and upper voltage class（Low-pressure end lead terminal spacing is larger）Carry out low-voltage short circuit
During impedance experiments, can two clips directly be clamped into low-pressure side both ends terminal, realize the function of short circuit.
For 500 and the transformer of following voltage class（It is smaller that head spacing occurs in low-pressure end lead）, B can be fixed on
At the clip 2 on right side, after C is fixed at the clip 2 in left side（Such as Fig. 3）, then clip clamped into step down side terminal.
For the higher transformer of voltage class, since the low-voltage short-circuit impedance value of itself is larger, therefore added during short circuit
Resistance value result is influenced it is smaller, and for the relatively low transformer of voltage class, due to the low-voltage short-circuit impedance value of itself
It is smaller, therefore additional resistance is affected to result of the test during short circuit.Obviously, in the case of without considering contact resistance, the electricity of Fig. 2
Resistance value is three times of Fig. 3, therefore when carrying out short-circuit impedance experiment to the relatively low transformer of voltage class, the mode of Fig. 3 is more accurate.
Meanwhile the copper wire distance designed above, live 10kV can be met to the low pressure of 1000kV voltage class transformers
Bring out line pitch requirements.
To sum up, which can be used as 10kV to test short circuit to 1000kV voltage class transformer low voltages short-circuit impedance and use,
And the state of adjustment structure can be passed through（Fig. 2 to Fig. 3 is converted）, make result of the test more accurate.
The above are the preferred embodiment of the utility model, all changes made according to technical solutions of the utility model are produced
Function without departing from technical solutions of the utility model scope when, belong to the scope of protection of the utility model.
Claims (4)
1. a kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment, it is characterised in that：Including being used for short-circuit copper
Line is fixed on first clamp, second clamp and the short-circuit copper wire of connection first clamp and second clamp at transformer lead,
The head end of wherein short-circuit copper wire is connected with first clamp, and the end of short-circuit copper wire is connected with second clamp, the first clamp, the
Two clips and short-circuit copper wire junction are both provided with threaded hole, the middle part of the short circuit copper wire and along the head end of short-circuit copper wire to end
Extreme direction is spaced to offer the first perforate, the second perforate.
2. a kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment according to claim 1, feature exist
In：When the transformer for 750kV and above carries out the experiment of low-voltage short-circuit impedance, directly by first clamp,
Second clamp clamps low-pressure side both ends terminal；It is short-circuit when carrying out low-voltage for 500kV and the transformer of following voltage class
During impedance experiments, the first perforate of short-circuit copper wire is fixed at the threaded hole of second clamp, by the second perforate of short-circuit copper wire
It is fixed at the threaded hole of first clamp, first clamp, second clamp is then clamped into low-pressure side both ends terminal.
3. a kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment according to claim 1 or 2, feature
It is：The short circuit copper wire length is 2m, and head end to the first perforate distance of short-circuit copper wire is 0.6m, and the first of short-circuit copper wire opens
Hole to the second perforate distance is 0.7m, and the end distance of the second perforate to the short-circuit copper wire of short-circuit copper wire is 0.7m.
4. a kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment according to claim 1 or 2, feature
It is：The first clamp, second clamp are full copper clip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381337.7U CN207457285U (en) | 2017-10-25 | 2017-10-25 | A kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381337.7U CN207457285U (en) | 2017-10-25 | 2017-10-25 | A kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207457285U true CN207457285U (en) | 2018-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721381337.7U Active CN207457285U (en) | 2017-10-25 | 2017-10-25 | A kind of short-circuit wire connection structure of transformer low-voltage short-circuit impedance experiment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207457285U (en) |
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2017
- 2017-10-25 CN CN201721381337.7U patent/CN207457285U/en active Active
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