An arc-suppression coil grounding device for medium voltage network
A grounding and medium-voltage technology for arc suppressing coils, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problems of increasing losses, inability to compensate high-frequency capacitive currents, Arc light grounding overvoltage and other problems to achieve the effect of reducing loss
Active Publication Date: 2011-05-18
CISDI ENG CO LTD
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Problems solved by technology
[0002] At present, the automatic tracking arc suppressing coil grounding widely used in the medium voltage system is the turn-adjusting type, which adopts graded switching and cannot accurately compensate the single-phase grounding capacitance current, especially the high-frequency capacitance current, so single-phase grounding occurs There is still the possibility of arcing to ground overvoltage
For the automatic turn-adjusting arc suppressing coil, in order to compensate the single-phase grounding capacitive current as accurately as possible, you can increase the gear position of the on-load tap changer or increase the number of electronic switching switches. The above methods can partially improve the shortcomings of the traditional arc suppressing coil, but It increases the complexity and unreliability of the system, and at the same time, due to the long-term connection of the arc suppression coil to the system, the loss during normal operation is increased; in addition, the detuning degree of the traditional automatic tracking arc suppression coil cannot be too high, so it increases the normal operation Neutral point unbalanced voltage when
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[0015] The present invention will be further described below in conjunction with accompanying drawing:
[0016] A grounding device for an arc suppressing coil for a medium voltage system, comprising:
[0017] Non-adjustable arc suppression coil 1, single-phase high-voltage switch 2, used for preliminary compensation of system capacitive current, connected in series between the neutral point and ground of the power system; active dynamic reactive power and harmonic compensation device 3, used for dynamic The compensation system capacitance current (including high-frequency capacitance current) is connected between the neutral point of the power system and the ground; the controller 6 judges the single-phase ground fault by detecting the input zero-sequence voltage and the zero-sequence capacitance current of each power distribution circuit and the fault capacitor current to control the single-phase high-voltage switch 2 and the active dynamic reactive power and harmonic compens...
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The invention relates to an arc-suppression coil grounding device for medium voltage network, which principally includes a non-adjustable arc suppression coil (1), a single-phase high-voltage switch (2), an active dynamic idle work and harmonic compensation means (3), and a controller (6), wherein, the non-adjustable arc-suppression coil (1) is connected in series with the single-phase high-voltage switch (2) and is connected between the system neutral point and earth, the active dynamic idle work and harmonic compensation means (3) is also connected between the system neutral point and earth.The controller (6) is used to determine single-phase ground fault, and detect the fault capacitive current, for controlling the single-phase high-voltage switch (2) and the active dynamic idle work and harmonic compensation means (3). The device is matched with the active dynamic idle work and harmonic compensation means through the non-adjustable arc suppression coil (1), and can accurately compensate the single-phase ground capacity current.
Description
technical field [0001] The invention relates to an arc suppression coil grounding device for a medium voltage system. Background technique [0002] At present, the automatic tracking arc suppressing coil grounding widely used in the medium voltage system is the turn-adjusting type, which adopts graded switching and cannot accurately compensate the single-phase grounding capacitance current, especially the high-frequency capacitance current, so single-phase grounding occurs There is still the possibility of arcing to ground overvoltage. For the automatic turn-adjusting arc suppressing coil, in order to compensate the single-phase grounding capacitive current as accurately as possible, you can increase the gear position of the on-load tap changer or increase the number of electronic switching switches. The above methods can partially improve the shortcomings of the traditional arc suppressing coil, but It increases the complexity and unreliability of the system, and at the sa...
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IPC IPC(8): H02H9/08
Inventor 王海
Owner CISDI ENG CO LTD