Grounding line selecting and ground fault section positioning method for arc suppression coil

A technology of arc suppressing coil and grounding line selection, which is applied in the direction of fault location and so on

Inactive Publication Date: 2014-08-06
江苏汉天星配电自动化科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes in view of the existing shortcomings, and provides a method for grounding lin

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  • Grounding line selecting and ground fault section positioning method for arc suppression coil
  • Grounding line selecting and ground fault section positioning method for arc suppression coil
  • Grounding line selecting and ground fault section positioning method for arc suppression coil

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Embodiment Construction

[0060] The present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0061] see Figure 1 to Figure 4 As shown, the present invention provides a method for grounding line selection and grounding fault section positioning for arc suppressing coils, wherein a power distribution automation system is installed on the substation, and monitoring terminals are installed on each switch in the line, and the monitoring The terminal measures the current flowing through it, and monitors the switches through which the current flows and the switches that do not flow through, and transmits the information to the distribution automation system. The grounding line selection method is based on the neutral point O of the main transformer B through When the arc suppression coil L is single-phase grounded, the capacitive current of the ungrounded line to the ground flows from the line to the earth, and the total capacitive current I of the ...

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Abstract

The invention discloses a grounding line selecting and ground fault section positioning method for an arc suppression coil. According to the method, when a neutral point of a main transformer is grounded in a one-phase mode through the arc suppression coil, a residual current and displacement voltage are generated, and the residual current is an inductive current in the overcompensation process, is a capacitance current in the undercompensation process and is equal to zero in the full compensation process to form a ground fault line; after grounding line selecting, the ground fault section positioning method includes the steps that on a grounding line, a section switch which the residual current does not flow through detects i0 as the capacitance current, the reactive power is a positive value, and the section between the switch which the residual current flows through and an adjacent switch which the residual current does not flow through serves as a ground fault section; if the residual current is detected in one line, the residual current and the small ground capacitance current are not detected in other lines, at the moment the line with the residual current serves as the ground line, and the section with the residual current and the adjacent section with the small ground capacitance current serve as the ground fault sections.

Description

technical field [0001] The invention relates to a method for grounding line selection and grounding fault section positioning for an arc suppression coil in a 10KV (and 35KV) system. Background technique [0002] With the development of the urban power grid, especially the extensive use of power cables, the capacitive current of the line to the ground is increasing, and the arc formed by the capacitive current at the fault point cannot be extinguished by itself when the single-phase is grounded; at the same time, the overvoltage generated by the gap arc often enlarges the accident. Significantly reduces the reliability of the power system. For this reason, the 10KV overhead line or overhead line and cable hybrid network, on the neutral point of the main transformer, adopts the grounding method of the arc suppression coil to extinguish the arc. When one phase is grounded, the inductive current generated by the arc suppression coil is mixed with the ground current generated o...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 杨万钟高正洪
Owner 江苏汉天星配电自动化科技有限公司
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