CN202424146U - Ferromagnetic resonance prevention control circuit of voltage transformer - Google Patents
Ferromagnetic resonance prevention control circuit of voltage transformer Download PDFInfo
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- CN202424146U CN202424146U CN2011205376003U CN201120537600U CN202424146U CN 202424146 U CN202424146 U CN 202424146U CN 2011205376003 U CN2011205376003 U CN 2011205376003U CN 201120537600 U CN201120537600 U CN 201120537600U CN 202424146 U CN202424146 U CN 202424146U
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- voltage transformer
- control circuit
- utility
- model
- winding
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- 230000005350 ferromagnetic resonance Effects 0.000 title abstract 3
- 230000002265 prevention Effects 0.000 title 1
- 238000004804 winding Methods 0.000 claims abstract description 18
- 230000008030 elimination Effects 0.000 claims abstract description 10
- 238000003379 elimination reaction Methods 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a voltage transformer prevents ferromagnetic resonance control circuit inserts non-linear resistance at voltage transformer primary circuit neutral point, inserts harmonic elimination resistance at secondary circuit opening triangle winding. Through the improvement of the primary and secondary control circuits of the existing voltage transformer, the current flowing through the high-voltage winding of the non-fault mutual inductor is greatly weakened when the single phase is grounded, and the overvoltage and overcurrent of the voltage transformer are effectively prevented, so that the aim of controlling the ferromagnetic resonance is fulfilled. The utility model has the advantages of small investment, fast effect, good anti-resonance effect, etc. Use the utility model discloses, can effectively avoid because the voltage transformer that faults such as single-phase ground of system probably arouse burns out to and system overvoltage causes the damage to other electrical equipment, thereby reduces equipment running cost, increases enterprise economic benefits.
Description
Technical field
The utility model belongs to the Electrical Control Technology field, and particularly a kind of voltage transformer is prevented the ferro resonance control circuit.
Background technology
In industrial and mining enterprises' electric power system, the 10kV electric power system is generally isolated neutral system (or through arc suppression coil earthing system), all is called small current neutral grounding system.In order to monitor substation busbars voltage, on each section bus, all be connected to a voltage transformer, its primary winding neutral-point solid ground.The shortcoming of this circuit is; Because the line inductance of power-to-ground capacitance and voltage transformer constitutes the ferro resonance condition; Be in operation and cause frequency division, power frequency or high-frequency iron magnetic resonance phenomenon, and cause overvoltage, scaling loss voltage transformer or other electrical equipment malfunction often occur.Therefore, even overvoltage does not take place in system, also possibly burn out the high pressure winding of two phases in addition during single-phase earthing.If system causes overvoltage because of single-phase earthing, then this electric current can be bigger.Far away like certain plant area apart from the area, water source, because the built on stilts coil of 10KV is longer, and running environment more complicated again, often receives extraneous various factors and disturb and the single-phase earthing accident takes place.Especially at small current neutral grounding system, will the voltage transformer on the bus in the transformer station be exerted an influence, cause equipment not run well thus in case the single-phase earthing accident takes place.
Summary of the invention
The purpose of the utility model is in order to overcome the deficiency of above-mentioned technology, existing voltage transformer first and second control circuit to be improved, thereby provides a kind of voltage transformer to prevent the ferro resonance control circuit.Through taking in circuit to increase technical measures such as resistance, flow through the electric current of non-fault phase instrument transformer high pressure winding when weakening single-phase earthing, effectively prevent voltage transformer overvoltage and overcurrent, thereby reach the purpose that the control ferro resonance takes place.
The utility model is achieved in that
A kind of voltage transformer is prevented the ferro resonance control circuit, comprises voltage transformer first and second loop control circuit, it is characterized in that neutral point inserts nonlinear resistance in the voltage transformer primary circuit, inserts harmonic elimination resistance at secondary circuit open delta winding.
The utility model has overcome the deficiency that prior art exists, and it is little to have an investment, instant effect, advantage such as anti-resonance effect is good.Neutral point inserts nonlinear resistance in the voltage transformer high-pressure side, flows through the electric current of non-fault phase instrument transformer high pressure winding when having weakened single-phase earthing, can effectively prevent voltage transformer overvoltage and overcurrent.Insert harmonic elimination resistance at voltage transformer secondary open delta winding, when in the electrical network ferro resonance taking place, because the existence of this harmonic elimination resistance, ferro resonance rapidly disappears under strong damping action, reaches the harmonic elimination purpose.Use that the utility model can effectively be avoided because the voltage transformer scaling loss that faults such as system's single-phase earthing possibly cause, and system's overvoltage causes the damage to other electric equipment, thereby reduce the equipment operation cost, increase the business economic benefit.
Description of drawings
Accompanying drawing is the anti-ferro resonance control circuit of a kind of voltage transformer
Among the figure: a phase winding head M, c phase winding afterbody N, nonlinear resistance R1, harmonic elimination resistance R 2.
Embodiment
Embodiment below in conjunction with in the accompanying drawing describes in detail the utility model:
A kind of voltage transformer is prevented the ferro resonance control circuit, and pressing first and second loop control circuit with the 10KV voltage transformer is example, shown in accompanying drawing.Insert nonlinear resistance R1 at voltage transformer primary side neutral point, select jumbo non-linear carborundum resistor disc for use, it is connected between winding neutral point of voltage transformer and the ground.Simultaneously, insert harmonic elimination resistance R 2, select 60 ohm, 500 watts resistance for use, it is connected between the afterbody N point of head M point and c phase winding of secondary open delta winding a phase winding at voltage transformer secondary open delta winding.
Action principle: insert nonlinear resistance R1 at voltage transformer primary side neutral point; Be equivalent to whenever relatively all insert resistance at the voltage transformer primary side; When can weakening single-phase earthing widely, it flows through the electric current of non-fault phase instrument transformer high pressure winding; Effectively prevent voltage transformer overvoltage and overcurrent, and can play the effect that suppresses harmonic wave.Insert harmonic elimination resistance R 2 at voltage transformer secondary open delta winding, when in the electrical network frequency division ferro resonance taking place, ferro resonance rapidly disappears under strong damping action.After resonance disappeared, this circuit returned to blocking state, reaches the harmonic elimination purpose.
Claims (1)
1. the anti-ferro resonance control circuit of voltage transformer comprises voltage transformer first and second loop control circuit, it is characterized in that neutral point inserts nonlinear resistance R1 in the voltage transformer primary circuit, inserts harmonic elimination resistance R 2 at secondary circuit open delta winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205376003U CN202424146U (en) | 2011-12-20 | 2011-12-20 | Ferromagnetic resonance prevention control circuit of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205376003U CN202424146U (en) | 2011-12-20 | 2011-12-20 | Ferromagnetic resonance prevention control circuit of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424146U true CN202424146U (en) | 2012-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205376003U Expired - Fee Related CN202424146U (en) | 2011-12-20 | 2011-12-20 | Ferromagnetic resonance prevention control circuit of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424146U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377680A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary alternating-current resonance elimination device used for electromagnetic type voltage transformer |
| CN105098757A (en) * | 2015-08-21 | 2015-11-25 | 国网天津宝坻供电有限公司 | Method for eliminating resonance of power distribution station |
-
2011
- 2011-12-20 CN CN2011205376003U patent/CN202424146U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377680A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary alternating-current resonance elimination device used for electromagnetic type voltage transformer |
| CN105098757A (en) * | 2015-08-21 | 2015-11-25 | 国网天津宝坻供电有限公司 | Method for eliminating resonance of power distribution station |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20171220 |