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Distribution network earth insulation parameter measuring and controlling method

A technology for ground insulation and parameter measurement, which is applied in the direction of ground resistance measurement, measuring electricity, and measuring devices to achieve the effects of reducing displacement voltage, promoting fault arc extinguishing, and promoting ground fault arc extinguishing

Inactive Publication Date: 2007-08-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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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

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Effect test

Embodiment 1

[0035] Embodiment 1 is to measure the ground insulation parameters of a 10kV simulated distribution network, and the wiring is shown in Figure 2. 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

[0036]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 d...

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Abstract

This invention discloses a measuring and controlling method of the direct earth insulating parameter of the distribution network. It has such steps as setting a high inductive-value reactor at the neutral point of the distribution network and a capacity-adjusting ground fault neutralizer injecting the frequency-changing current signal to the distribution network via the reactor, real-time measuring the back current signal and computing the direct earth capacitance, resistance and damping ratio of the distribution network. It detects the single-phase ground fault according to the displacement voltage and the damping ratio and instantly shuts the switch of ground fault neutralizer when the single-phase ground fault occurs and inputting proper ground fault neutralizer, compensating the network capacitance current and accelerating the extinguishing of the fault voltaic arc. This measuring and controlling method has high measuring accuracy and good real time and specially being appropriate to the single-phase loading distribution network. It thoroughly settles the neutral-point displacement voltage of the high-symmetry distribution network, fault arc blowout and the on-line puzzle of the targeted insulating parameter which is good to improve the indices of the reliability of the 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 Applications(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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