CN103269065A - Resonance eliminating system of power voltage transformer - Google Patents
Resonance eliminating system of power voltage transformer Download PDFInfo
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- CN103269065A CN103269065A CN2012105247463A CN201210524746A CN103269065A CN 103269065 A CN103269065 A CN 103269065A CN 2012105247463 A CN2012105247463 A CN 2012105247463A CN 201210524746 A CN201210524746 A CN 201210524746A CN 103269065 A CN103269065 A CN 103269065A
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- resonance
- contactor
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- controller
- voltage transformer
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a resonance eliminating system of a power voltage transformer. The resonance eliminating system consists of a sensor, a contactor and a controller, and the resonance eliminating system is characterized in that the sensor adopts a Hall sensor, wherein the output end of the Hall sensor is connected with a signal input end of the controller, a collected grounding current signal is inputted to the controller, the contactor adopts a 10KV vacuum contactor, amd two ends of the 10KV contactor are respectively connected with a damping resistor in parallel. The resonance eliminating system is installed between a primary grounding point of the 10KV voltage transformer and the ground, the zero-sequence impedance can be calculated in real time, the grounding current can be monitored in real time, when the resonance is occurred, the controller collects U0 and the grounding current to identify a resonance fault, and the resonance is eliminated by changing the zero-sequence impedance of the voltage transformer. Compared with the prior art, the resonance fault is detected and identified by adopting an intelligent device, so that the misjudgment of the resonance can be avoided; and by adding the damping resistance on a primary side, the elimination of the resonance can be guaranteed.
Description
Technical field
The present invention relates to a kind of voltage of power instrument transformer resonance and eliminate system, this system eliminates between 10KV voltage transformer and the power-to-ground capacitance and produces nonlinear resonance.
Background technology
In the mid point isolated neutral system; because the needs of 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 non-linear; 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 the 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, instrument transformer mid point and power supply mid point are idiostatic over the ground during normal the operation, be that mid point is not subjected to displacement, when resonance takes place when, instrument transformer one phase, two-phase or three-phase winding voltage raise, each current potential change relatively then shows as the power supply mid point in the change of this a part of voltage to earth of electrical network and is subjected to displacement, and residual voltage occurs.As seen the resonance phenomena of voltage transformer can cause instrument transformer itself to burn and the residual voltage rising, so be necessary in time to eliminate such resonance.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, and a kind of system for the elimination of 10KV voltage transformer resonance is provided.
The present invention can be achieved through the following technical solutions: be made 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 that collects is inputed to controller, contactor adopts the 10KV vacuum contactor, and 10KV contactor two ends also connect damping resistance.
The resistance of damped resistor of the present invention is 6% voltage transformer resistance value, and resistance material is ripple resistance.
The rated voltage of 10KV vacuum contactor of the present invention is greater than 10KV, and rated current is greater than 50A.
The rated current of Hall element of the present invention is greater than 50A.
The present invention is installed between earth point of 10KV voltage transformer and the ground, in real time calculating voltage instrument transformer zero sequence impedance and the monitoring earth current, when resonance takes place when, controller comes identification resonance fault by gathering UO and earth current, by change voltage transformer zero sequence impedance value, thereby eliminate resonance.Compared with prior art, the present invention adopts intelligent equipment to detect and identification resonance fault, has avoided the erroneous judgement to resonance, and passes through to drop into damping resistance at primary side, thereby has guaranteed the elimination of resonance.
Description of drawings
Fig. 1 is structure of the present invention and the state of use wiring schematic diagram;
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
Referring to Fig. 1, the present invention is made 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 that collects 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 the 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 is gathered Uo voltage signal and earth current signal with the sample rate of 5KB/S, if zero sequence impedance is less than greater than normal value 10 times of half or earth current of normal value, and continue 10 seconds, then drop into damping resistance and recover normal up to zero sequence impedance and earth current.
Claims (4)
1. a voltage of power instrument transformer resonance is eliminated system, constituted by 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 that collects is inputed to controller, contactor adopts the 10KV vacuum contactor, and 10KV contactor two ends also connect damping resistance.
2. voltage of power instrument transformer resonance according to claim 1 is eliminated system, and it is characterized in that: the resistance of damped resistor is 6% voltage transformer resistance value, and resistance material is ripple resistance.
3. voltage of power instrument transformer resonance according to claim 1 is eliminated system, and it is characterized in that: the rated voltage of 10KV vacuum contactor is greater than 10KV, and rated current is greater than 50A.
4. voltage of power instrument transformer resonance according to claim 1 is eliminated system, and 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 |
|---|---|---|---|
| CN2012105247463A CN103269065A (en) | 2012-12-10 | 2012-12-10 | Resonance eliminating system of power voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105247463A CN103269065A (en) | 2012-12-10 | 2012-12-10 | Resonance eliminating system of power voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103269065A true CN103269065A (en) | 2013-08-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105247463A Pending CN103269065A (en) | 2012-12-10 | 2012-12-10 | Resonance eliminating system of power voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103269065A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5468939A (en) * | 1977-11-11 | 1979-06-02 | Mitsubishi Electric Corp | Neutral point grounding circuit for power generation or transmission system |
| CN2854485Y (en) * | 2005-11-21 | 2007-01-03 | 新乡市科隆散热器有限公司 | Fin of string-fin radiator |
| CN201122840Y (en) * | 2007-12-06 | 2008-09-24 | 徐成飞 | Intelligent neutral point resistance grounding device |
| CN202189094U (en) * | 2011-07-25 | 2012-04-11 | 河北工业大学 | Device for automatically measuring off-turning degree of resonance earthing power grid |
| CN203312784U (en) * | 2012-12-10 | 2013-11-27 | 江西赣东北供电公司 | 10kV voltage transformer resonance eliminating device |
-
2012
- 2012-12-10 CN CN2012105247463A patent/CN103269065A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5468939A (en) * | 1977-11-11 | 1979-06-02 | Mitsubishi Electric Corp | Neutral point grounding circuit for power generation or transmission system |
| CN2854485Y (en) * | 2005-11-21 | 2007-01-03 | 新乡市科隆散热器有限公司 | Fin of string-fin radiator |
| CN201122840Y (en) * | 2007-12-06 | 2008-09-24 | 徐成飞 | Intelligent neutral point resistance grounding device |
| CN202189094U (en) * | 2011-07-25 | 2012-04-11 | 河北工业大学 | Device for automatically measuring off-turning degree of resonance earthing power grid |
| CN203312784U (en) * | 2012-12-10 | 2013-11-27 | 江西赣东北供电公司 | 10kV voltage transformer resonance eliminating device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130828 |