CN202906454U - Transformer iron core and clamp multi-point grounding automatic current limiting safety device - Google Patents
Transformer iron core and clamp multi-point grounding automatic current limiting safety device Download PDFInfo
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- CN202906454U CN202906454U CN 201220638518 CN201220638518U CN202906454U CN 202906454 U CN202906454 U CN 202906454U CN 201220638518 CN201220638518 CN 201220638518 CN 201220638518 U CN201220638518 U CN 201220638518U CN 202906454 U CN202906454 U CN 202906454U
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- transformer
- clamp
- iron core
- current limiting
- limiting safety
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Disclosed is a transformer iron core and clamp multi-point grounding automatic current limiting safety apparatus, belonging to the transformer technology field. The transformer iron core and clamp multi-point grounding automatic current limiting safety apparatus is characterized in that more than two resistors are serially connected between the transformer core, the clamp, and the grounding terminal; the connecting nodes of the resistors are connected with the transformer core and the clamp via fuses; the grounding terminal is connected with the transformer core and the clamp via the fuses; two ends of each resistor are parallelly connected with an audible-visual annunciator; the resistances of all the resistors are equal; and all the fuses are the self-recovery fuses with equal rated current. The transformer iron core and clamp multi-point grounding automatic current limiting safety device of the utility model overcomes the defects of the prior art, features simple structure, and realizes comprehensive control over the hidden troubles of the device. When the grounding current exceeds the standard, the corresponding self-recovery fuse switches off, and meanwhile the resistance value in the loop is automatically adjusted, thereby keeping the iron core and clamp grounding current below 0.1A. In addition, the disconnected self-recovery fuse completes automatic recovery. In this way, the secure operation of the transformer is ensured.
Description
Technical field
The utility model belongs to the emergency protection circuit device for electric category that does not cut off circuit for the restriction overcurrent, is particularly useful for electrical transformer cores, clamp earthing current on-line monitoring and crosses the flow restriction security fields.
Background technology
Power transformer is one of equipment crucial in the electric power system, also is the higher link of failure rate in the power equipment, and its normal operation is the important guarantee of power system security, reliable, high-quality, economical operation.Under normal circumstances, transformer core, folder have and only have one point earth, in case 2 or multipoint earthing, earth current can obviously increase, the consequence that causes can make the inner circulation that produces of transformer, causes local overheating, insulation damages, loss increase and even transformer damage, and are one of hidden danger of harm transformer safe operation.
According to the rules requirement, when iron core, clamp earthing current reach 100mA, just must take corresponding measure to process.General processing method is fixed resistance value resistance of series connection current limliting in addition in grounded circuit, although the method has reduced the danger of equipment operation to a certain extent, but can't accomplish comprehensive control to hidden trouble of equipment, because when device interior is unstable earth point, because the current-limiting resistance that seals in can not change resistance size and automatic switching, the problem that floating potential appears in the bigger than normal or iron core of earth current can appear.Therefore, guaranteeing that the main transformer safe and stable operation is most important, set up the online monitoring of a cover and automatic current limiting safety device, rational scope is arrived in iron core, the clamp earthing current volitional check of transformer, is the active demand of the healthy operation of lifting means.
The utility model content
Technical problem to be solved in the utility model provide a kind of simple in structure, hidden trouble of equipment is accomplished comprehensive control, the safe operation that can guarantee transformer, minimizing even is replaced the operations staff to patrol and examine transformer core, multipoint earthing of clamping piece on-line monitoring and the automatic current limiting safety device of work.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
A kind of transformer core, multipoint earthing of clamping piece automatic current limiting safety device, it is characterized in that, at the resistance that is serially connected with between transformer core, folder and the earth terminal more than 2, be connected by fuse between the node that each resistance connects and transformer core, the folder, also be connected by fuse between while earth terminal and transformer core, the folder.
Each resistance two ends audible-visual annunciator in parallel, the warning effect is more obvious, helps the operator on duty in time to receive warning message.
The resistance of each resistance equates that each fuse rated current is identical, so that calculatings, control transformer iron core, clamp earthing current are big or small.
Fuse is for certainly recovering fuse, and the plant automation level is high, and is convenient and practical.
The beneficial effect that adopts technique scheme to produce is: the utility model efficiently solves transformer core, folder on-line monitoring and an automatic difficult problem of crossing flow restriction, simple in structure, stablize durable, can accomplish comprehensive control to hidden trouble of equipment, whether real time and on line monitoring transformer core, folder electric current be in allowed band, and transformer core, the folder that exceeds setting carried out current limliting, both can guarantee the safe operation of transformer, can reduce even replace again operations staff's the work of patrolling and examining, have good economic benefit and social benefit.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
1, transformer core, folder, R1-R5 are resistance, and L1-L5 is audible-visual annunciator, and FU1-FU5 is fuse.
Embodiment
Embodiment 1(sees Fig. 1), China " power equipment preventive trial rules " (Q/CSG10007-2004) in 5.1 " oil-immersed power transformers " about the requirement of " iron core and clamp insulation resistance ": " iron core grounding current in service generally not should greater than 0.1A "; In the field condition, used main transformer core, in the situation of multipoint earthing of clamping piece, the electromotive force that induces in the loop generally can not surpass 15V, therefore the transformer core that adopts, multipoint earthing of clamping piece automatic current limiting safety device, at transformer core, be serially connected with 5 substitutional resistance R1-R5 between folder and the earth terminal, be 30 Ω, 10W, node and transformer core that resistance R 1-R4 connects, connect by certainly recovering fuse FU1-FU4 respectively between the folder, while earth terminal and transformer core, also connect by certainly recovering fuse FU5 between the folder, 5 recovering fuse FU1-FU5 is 0.1A certainly, 250V, audible-visual annunciator L1-L5 selects by designing requirement, and is in parallel with resistance R 1-R5 respectively.During use, when transformer normally moved, earth current is very little to be below the 0.1A, and electric current only flows through by certainly recovering fuse FU5, and audible-visual annunciator L1-L5 does not report to the police; When iron core, folder existed or multipoint earth faults at 2, electric current increased unusual, when the fault earthing electric current surpasses 0.1A, certainly recovered fuse FU5 and disconnected, and by certainly recovering fuse FU4 and resistance R 5 flows through, audible-visual annunciator L5's electric current reports to the police simultaneously automatically; If still surpass 0.1A by the electric current that certainly recovers fuse FU4, then disconnect from recovering fuse FU4, electric current flows through by certainly recovering fuse FU3, resistance R 4, resistance R 5, audible-visual annunciator L4, audible-visual annunciator L5 report to the police at this moment, the resistance value in the access loop is adjusted in so action automatically, until with iron core, the final stability line of clamp earthing current below 0.1A, and the certainly recovery fuse that will disconnect finishes automatic recovery, and is convenient and practical.
Claims (4)
1. a transformer core, multipoint earthing of clamping piece automatic current limiting safety device, it is characterized in that, at the resistance that is serially connected with between transformer core, folder and the earth terminal more than 2, be connected by fuse between the node that each resistance connects and transformer core, the folder, also be connected by fuse between while earth terminal and transformer core, the folder.
2. transformer core according to claim 1, multipoint earthing of clamping piece automatic current limiting safety device is characterized in that, each resistance two ends audible-visual annunciator in parallel.
3. transformer core according to claim 1, multipoint earthing of clamping piece automatic current limiting safety device is characterized in that, the resistance of each resistance equates that each fuse rated current is identical.
4. according to claim 1,2 or 3 described transformer cores, multipoint earthing of clamping piece automatic current limiting safety device, it is characterized in that fuse is for from recovering fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220638518 CN202906454U (en) | 2012-11-28 | 2012-11-28 | Transformer iron core and clamp multi-point grounding automatic current limiting safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220638518 CN202906454U (en) | 2012-11-28 | 2012-11-28 | Transformer iron core and clamp multi-point grounding automatic current limiting safety device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906454U true CN202906454U (en) | 2013-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220638518 Expired - Fee Related CN202906454U (en) | 2012-11-28 | 2012-11-28 | Transformer iron core and clamp multi-point grounding automatic current limiting safety device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202906454U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441725A (en) * | 2013-08-27 | 2013-12-11 | 国家电网公司 | System for monitoring and controlling grounding currents of transformer core |
| CN103558450A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | On-line monitoring device of three mutual inductors of grounding current of clamp of transformer |
| CN103560499A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control method for three current transformers to monitor lower transformer clamping parts |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN103558451A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Control device of transformer clamping piece multi-point grounding currents through online monitoring of double current transformers |
| CN105655100A (en) * | 2016-03-23 | 2016-06-08 | 江苏源通电气有限公司 | 10kV-level epoxy resin cast dry-transformer |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
-
2012
- 2012-11-28 CN CN 201220638518 patent/CN202906454U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441725A (en) * | 2013-08-27 | 2013-12-11 | 国家电网公司 | System for monitoring and controlling grounding currents of transformer core |
| CN103558450A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | On-line monitoring device of three mutual inductors of grounding current of clamp of transformer |
| CN103560499A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control method for three current transformers to monitor lower transformer clamping parts |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN103558451A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Control device of transformer clamping piece multi-point grounding currents through online monitoring of double current transformers |
| CN103558451B (en) * | 2013-11-02 | 2015-11-25 | 国家电网公司 | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device |
| CN103558450B (en) * | 2013-11-02 | 2015-11-25 | 国家电网公司 | Three mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current |
| CN103560499B (en) * | 2013-11-02 | 2015-12-02 | 国家电网公司 | The control method of the lower multipoint earthing of clamping piece of transformer electric current of three current transformer monitorings |
| CN103560485B (en) * | 2013-11-02 | 2016-08-31 | 国家电网公司 | The control method of the lower multipoint earthing of clamping piece of transformer electric current of double-current transformer monitoring |
| CN105655100A (en) * | 2016-03-23 | 2016-06-08 | 江苏源通电气有限公司 | 10kV-level epoxy resin cast dry-transformer |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20171128 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |