CN203312784U - 10kV voltage transformer resonance eliminating device - Google Patents
10kV voltage transformer resonance eliminating device Download PDFInfo
- Publication number
- CN203312784U CN203312784U CN2012206730856U CN201220673085U CN203312784U CN 203312784 U CN203312784 U CN 203312784U CN 2012206730856 U CN2012206730856 U CN 2012206730856U CN 201220673085 U CN201220673085 U CN 201220673085U CN 203312784 U CN203312784 U CN 203312784U
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- voltage transformer
- resonance
- contactor
- controller
- eliminating device
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- 238000013016 damping Methods 0.000 claims abstract description 9
- 230000008030 elimination Effects 0.000 abstract description 4
- 238000003379 elimination reaction Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model relates to a 10kV voltage transformer resonance eliminating device. The 10kV voltage transformer resonance eliminating device is composed of a sensor, a contactor and a controller. The 10kV voltage transformer resonance eliminating device is characterized in that the sensor adopts a Hall sensor, the output end of the Hall sensor is connected with the control signal input end of the controller to input acquired grounding current signals to the controller, the contactor adopts a 10kVvacuum contactor, and two ends of the 10kV contactor are connected in parallel with a damping resistor. The 10kV voltage transformer resonance eliminating device of the utility model is installed between of the primary grounding point the 10kV voltage transformer and the ground, the voltage transformer zero-sequence impedance can be calculated and the grounding current can be monitored on a real time basis, and when resonance occurs, resonance failures are identified by the controller through an acquisition UO and the grounding current, and the resonance is eliminated by changing the voltage transformer zero-sequence impedance value. Compared with the prior art, according to the utility model, the resonance failures are detected and identified by adopting intelligent equipment, the erroneous judgement of resonance can be avoided, and the elimination of the resonance can be ensured by adding the damping resistor at the primary side.
Description
Technical field
The utility model relates to a kind of device for the elimination of 10kV voltage transformer resonance, and this device is eliminated between 10kV voltage transformer and power-to-ground capacitance and produced nonlinear resonance.
Background technology
In the mid point isolated neutral system; needs due to ground protection; the mid point of threephase potential transformer is directly grounded; therefore voltage transformer and formation resonant tank in parallel with the power network line direct-to-ground capacitance; the inductance of electromagnetic potential transformer is nonlinear; this resonant tank is the nonlinear resonance loop, or claims the ferro resonance loop.
Usually, when normal operation, the induction reactance of voltage transformer is much larger than the capacitive reactance of voltage transformer, both can not form resonance, for example single phase ground fault, circuit combined floodgate, lightning impulse etc., make voltage transformer enter saturation region but for some reason,, make its inductance value change, the induction reactance of voltage transformer and the capacitive reactance of voltage transformer just may be mated and be produced resonance.Because the electrical network mid point is earth-free, during normal operation, instrument transformer mid point and power supply mid point are idiostatic over the ground, be that mid point is not subjected to displacement, when resonance occurs when, instrument transformer one phase, two-phase or three-phase winding voltage raise, each relatively current potential change, show as the power supply mid point in the change of this a part of voltage to earth of electrical network and be subjected to displacement, and residual voltage occurs.The resonance phenomena of visible voltage transformer can cause instrument transformer itself to burn with residual voltage and raise, so be necessary, eliminates in time such resonance.
Summary of the invention
The purpose of this utility model is exactly in order to address the above problem, and a kind of device for the elimination of 10kV voltage transformer resonance is provided.
The utility model can be achieved through the following technical solutions: consist of transducer, contactor and controller, it is characterized in that: transducer adopts Hall element, Hall element output termination controller control signal input, the earth current signal collected is inputed to controller, contactor adopts the 10kV vacuum contactor, and 10kV contactor two ends also connect damping resistance.
The resistance of damped resistor described in the utility model is 6% voltage transformer resistance value, and resistance material is ripple resistance.
The rated voltage of 10kV vacuum contactor described in the utility model is greater than 10kV, and rated current is greater than 50A.
The rated current of Hall element described in the utility model is greater than 50A.
The utility model is arranged between earth point of 10kV voltage transformer and ground, in real time calculating voltage instrument transformer zero sequence impedance and the monitoring earth current, when resonance occurs when, controller carrys out identification resonance fault by gathering UO and earth current, by changing voltage transformer zero sequence impedance value, thereby eliminate resonance.Compared with prior art, the utility model adopts intelligent equipment Detection and identification resonance fault, has avoided the erroneous judgement to resonance, and by primary side, dropping into damping resistance, thereby guaranteed the elimination of resonance.
The accompanying drawing explanation
Fig. 1 is structure of the present utility model and the state of use wiring schematic diagram;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment
Referring to Fig. 1, the utility model consists of Hall element 1,10kV contactor 2, damping resistance 3, controller 4, Hall element 1 output termination controller control signal input, the earth current signal collected is inputed to control, the employing rated current is that 100A, no-load voltage ratio are the Hall element of 100A/100mA, and rated current is greater than 50A.Hall element be connected in series 10kV contactor 2 after be coupled in loop.10kV contactor 2 adopts the one pole 10kV vacuum contactor of rated current 160A, and two ends also connect damping resistance 3, and it is 6% voltage transformer resistance value that damping resistance 3 adopts 1K Europe, the resistance of withstand voltage 10kV, and resistance material is ripple resistance.Controller gathers Uo voltage signal and earth current signal with the sample rate of 5KB/S, if zero sequence impedance is less than half or earth current of normal value and is greater than 10 times of normal value, and continue 10 seconds, drop into damping resistance until zero sequence impedance and earth current recover normal.
Claims (4)
1. the device eliminated of a 10kV voltage transformer resonance, by transducer, contactor and controller, formed, it is characterized in that: transducer adopts Hall element, Hall element output termination controller control signal input, the earth current signal collected is inputed to controller, contactor adopts the 10kV vacuum contactor, and 10kV contactor two ends also connect damping resistance.
2. the device eliminated of 10kV voltage transformer resonance according to claim 1, it is characterized in that: the resistance of damped resistor is 6% voltage transformer resistance value, and resistance material is ripple resistance.
3. the device eliminated of 10kV voltage transformer resonance according to claim 1, it is characterized in that: the rated voltage of 10kV vacuum contactor is greater than 10kV, and rated current is greater than 50A.
4. the device eliminated of 10kV voltage transformer resonance according to claim 1, it is characterized in that: the rated current of Hall element is greater than 50A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206730856U CN203312784U (en) | 2012-12-10 | 2012-12-10 | 10kV voltage transformer resonance eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206730856U CN203312784U (en) | 2012-12-10 | 2012-12-10 | 10kV voltage transformer resonance eliminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203312784U true CN203312784U (en) | 2013-11-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206730856U Expired - Fee Related CN203312784U (en) | 2012-12-10 | 2012-12-10 | 10kV voltage transformer resonance eliminating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203312784U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269065A (en) * | 2012-12-10 | 2013-08-28 | 江西赣东北供电公司 | Resonance eliminating system of power voltage transformer |
| CN108306274A (en) * | 2018-02-23 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
-
2012
- 2012-12-10 CN CN2012206730856U patent/CN203312784U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269065A (en) * | 2012-12-10 | 2013-08-28 | 江西赣东北供电公司 | Resonance eliminating system of power voltage transformer |
| CN108306274A (en) * | 2018-02-23 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
| CN108306274B (en) * | 2018-02-23 | 2019-04-09 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
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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: 20131127 Termination date: 20171210 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |