Device utilizing Z-type compensation transformer to realize full compensation of single-phase grounding current of distribution network
A compensation transformer, single-phase grounding technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. High overvoltage and other problems, to achieve the effect of easy integration and serial production, reducing floor space and cost, and easy manufacturing
Pending Publication Date: 2019-06-04
HEBEI XUHUI ELECTRIC
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Problems solved by technology
Therefore, when the active current and harmonic current in the grounding current are large, because they cannot be compensated by the arc suppression coil, sometimes the arc at the grounding point cannot be self-extinguished, resulting in high overvoltage, which affects the safe operation of the system and the safety of personnel and equipment. being threatened
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[0018] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0019] The invention discloses a Z-type compensating transformer to realize a full compensation device for a single-phase grounding current of a distribution network, which can compensate the grounding current to be close to 0A and completely eliminate arc light. The following are specific examples:
[0020] Such as figure 1 As shown, the present invention discloses a full compensation device for single-phase grounding current in a distribution network using a Z-type compensation transformer, including a Z-type compensation transformer ZDB, a fast switch K, a high short-circuit impedance step-up transformer GSB, a compensator APC and a controller KZQ; the neutral point O of the Z-type compensation transformer ZDB is connected to the high-voltage winding of the high-short-circuit impedance step-up transformer GSB through a fast switch K; the low...
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The invention relates to a device utilizing a Z-type compensation transformer to realize full compensation of a single-phase grounding current of a distribution network. The device belongs to the technical field of grid safety operation control. The device utilizing the Z-type compensation transformer to realize full compensation of the single-phase grounding current of the distribution network comprises the Z-type compensation transformer ZDB, a high-short-circuit impedance step-up transformer GSB, a fast switch K, a compensator APC and a controller KZQ, wherein a neutral point O of the Z-type compensation transformer ZDB is connected with a high-voltage winding of the high-short-circuit impedance step-up transformer GSB by means of the fast switch K; a low-voltage winding of the high-short-circuit impedance step-up transformer GSB is connected with an output end of the compensator APC; and a control end of the compensator APC is connected with the controller KZQ by means of an RS485communication line. The device utilizing the Z-type compensation transformer to realize full compensation of the single-phase grounding current of the distribution network can compensate the groundingcurrent to close to 0A, completely eliminates arc light and improves the safety of the power grid.
Description
technical field [0001] The invention belongs to the technical field of power grid safety operation control, and in particular relates to a device for realizing full compensation of single-phase grounding current of a distribution network by using a Z-shaped compensation transformer. Background technique [0002] In the resonant grounded power distribution system, if a single-phase ground fault occurs, the arc suppression coil can compensate the ground current. However, since the ground current contains active components and harmonic components in addition to reactive components, the arc suppression coil can only compensate for reactive currents. Therefore, when the active current and harmonic current in the grounding current are large, because they cannot be compensated by the arc suppression coil, sometimes the arc at the grounding point cannot be self-extinguished, resulting in high overvoltage, which affects the safe operation of the system and the safety of personnel and...
Claims
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IPC IPC(8): H02H9/08
Inventor 张旭辉韩劲松常杰高志辉张振江任君超
Owner HEBEI XUHUI ELECTRIC