Distribution network earth insulation parameter measuring and controlling method

It is a technology of ground insulation and parameter measurement. It is applied in the direction of ground resistance measurement, measurement of electricity, and measurement devices to achieve the effects of reducing ground fault residual current, promoting ground fault arc extinguishing, and reducing displacement voltage.

Inactive Publication Date: 2009-07-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

At present, there is no report on the method of on-line measurement and optimal control of the insulation parameters of the distribution network to the ground at home and abroad.

Method used

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  • Distribution network earth insulation parameter measuring and controlling method
  • Distribution network earth insulation parameter measuring and controlling method
  • Distribution network earth insulation parameter measuring and controlling method

Examples

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Embodiment 1

[0034] Embodiment 1 is to measure the ground insulation parameter of a 10kV analog distribution network, the wiring is as follows figure 2 shown. The measurement results of the ground-to-ground capacitance parameters in the distribution network's ground-to-ground insulation parameters are shown in Table 1. The maximum relative error of the ground-to-ground capacitance measurement is 1.59%; The results are shown in Table 2. The maximum relative error of the ground resistance measurement is 3.5%; the maximum relative error of the damping rate measurement is 3.5%.

Embodiment 2

[0035] Embodiment 2 is to measure and control an actual distribution network. The distribution network ground insulation parameter measurement and control instrument based on the distribution network ground insulation parameter measurement and control method has been operated in a 10kV substation with a single-phase street lamp load and a three-phase asymmetry degree. The neutral point of the measurement and control instrument is set The setting value of displacement voltage is 500V, and the setting value of damping rate is 0.20. During the operation of the ground insulation parameter monitoring instrument installed in the distribution network, three single-phase ground faults occurred. The field fault record data is shown in Table 3. When the ground fault occurs, the measuring and controlling instrument can reliably detect the ground fault and close the Coil switch, put in an arc suppression coil of appropriate capacity, fully compensate the ground capacitance current of the ...

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Abstract

The invention discloses a method for measuring and controlling the ground insulation parameters of a distribution network, comprising the following steps: installing a reactor with a large inductance value and an arc suppression coil with adjustable capacity at the neutral point of the distribution network , inject a current signal with a changing frequency into the distribution network through the reactor, measure the returned voltage signal in real time, calculate the ground capacitance, ground resistance and damping rate of the distribution network, and judge the single-phase ground fault according to the displacement voltage and damping rate ; When a single-phase ground fault occurs in the power grid, quickly close the arc suppression coil switch, put in an arc suppression coil with an appropriate capacity, compensate the capacitive current of the power grid, and promote the extinguishment of the fault arc. The measurement and control method has the characteristics of high measurement accuracy and good real-time performance, and is especially suitable for distribution networks with single-phase loads. The technical problem of online measurement of ground insulation parameters is conducive to improving the safe and reliable operation index of distribution network.

Description

technical field [0001] The invention relates to a method for measuring and controlling the ground insulation parameters of a distribution network, which is especially suitable for distribution networks with single-phase loads. Background technique [0002] The distribution network insulation parameters include ground capacitance, ground resistance and damping rate of the distribution network. The insulation parameters of the distribution network directly affect the magnitude of the single-phase-to-ground fault residual current and the fault arc extinguishing ability of the distribution network. The existing 6-35kV distribution network in my country generally adopts the neutral point grounding method through the arc suppression coil, and part of the load adopts single-phase power supply, such as urban street lamp load, which leads to the increase of the three-phase asymmetry of the distribution network, resulting in higher The displacement voltage even exceeds the allowable r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01R27/20G01R27/26G01R31/02G01R31/08
Inventor 曾祥君曾祥淼刘张磊李泽文王媛媛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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