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Laboratory simulation test method of control parameters of dynamical earthing method for power distribution network neutral point

A technology of laboratory simulation and grounding method, which is applied in the field of neutral point grounding of distribution network, can solve the problems of small detuning degree of power grid, high asymmetrical voltage of power grid, and reliable extinguishment of grounding arc, so as to achieve good equivalence, The effect of strong equivalence, good flexibility and operability

Active Publication Date: 2014-02-19
李景禄
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Problems solved by technology

However, it is necessary to solve the time problem of the residual flow control after compensation and the corresponding dynamic switching
If the residual current is too large, it will affect the reliable extinguishing of the grounding arc; if the residual current is too small, it will cause the grid detuning to be too small, and the asymmetrical voltage of the grid will be too high

Method used

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  • Laboratory simulation test method of control parameters of dynamical earthing method for power distribution network neutral point

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Embodiment Construction

[0009] The arc extinguishing critical value test under different insulation conditions of the distribution network, as shown in the figure, selects the insulator type commonly used in the distribution network for the insulation condition of the ground fault point, and controls it through the complete set of automatic tracking arc suppression compensation device or in the distribution network The grounding point dynamic grounding method and complete set of devices are used to adjust the grounding short-circuit current value of the grounding fault point, and the fuse is connected in parallel to the ground next to the insulator, and a single-phase grounding short-circuit arc is generated by the short-circuiting of the fuse. First start with a lower single-phase ground current value, and gradually increase the single-phase ground current value until the single-phase ground short-circuit arc cannot be extinguished, and obtain the arc extinguishing critical value of each rated voltage...

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Abstract

According to a laboratory simulation test method of control parameters of a dynamical earthing method for a power distribution network neutral point, a power distribution simulation test network (1), automatic tracking arc extinction and compensation complete equipment (2) and an earth fault point (3) are included. By means of the laboratory simulation test method, under the situation of different voltage grades, different power grid insulation structures and different residual flow control modes of arc extinction coil connection, an extinction arc critical value of an instantaneous earth fault of a power distribution network under the different fault point insulation working conditions, and displacement voltage and the corresponding extinction arc time of the power distribution network neutral point when the earth fault recovers are obtained, and therefore the control parameters of the dynamical earthing method for the power distribution network neutral point and the complete equipment are obtained.

Description

technical field [0001] The invention mainly relates to the field of neutral point grounding of a distribution network, in particular to a laboratory simulation test method for controlling parameters of a dynamic neutral point grounding method of a distribution network. Background technique [0002] The grounding of the neutral point through the arc suppressing coil is mainly used in the distribution network with a capacitive current greater than 10A. In order to ensure the continuity and reliability of the power supply, the regulations stipulate that it can operate with a single-phase ground fault for 2 hours. This is based on the fact that the residual current at the fault point after compensation by the arc suppression coil is less than the arc extinguishing critical value of the grid, which can promote the extinction of the arc, restore the fault and improve the reliability of power supply. However, the grounding of the arc suppression coil cannot restore the insulation o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 李政洋李景禄
Owner 李景禄
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