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Substation grounding grid impact diffusion characteristic test device

A substation grounding grid and characteristic testing technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems that cannot reflect the impact characteristics of the grounding grid, do not have high sensitivity, cannot guarantee synchronization, etc., and achieve good scalability performance, facilitate comparative analysis, improve accuracy and efficiency

Active Publication Date: 2015-09-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above measurements of the electrical parameters of the grounding grid are based on power frequency conditions and cannot reflect the impact characteristics of the grounding grid; due to the large amplitude of the lightning current, if the equipment used cannot fully consider the insulation performance, it may There will be equipment damage; in addition, due to the wide frequency range of lightning current, if the equipment used does not have high sensitivity and high sampling rate, the measured waveform will be distorted; due to the short duration of lightning current, if the measured data If the synchronization cannot be guaranteed, it will lead to errors in the comparative analysis of the later test results and reduce the reliability of the test.

Method used

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Embodiment Construction

[0031] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the substation grounding grid impact dispersion characteristics testing device embodiment of the present invention includes the following parts:

[0033] An inrush current generator 10, whose output is connected to the inrush current injection point of the ground grid of the substation through a wire 20, for providing a high-frequency inrush current to simulate a lightning strike in a substation;

[0034] A plurality of split current sensors 40 are arranged in a plurality of circles with the impulse current injection point as the center and the varying length of the arithmetic difference as the radius, and these circles intersect with the grounding grid at the grounding grid. see figure 2 , where the solid dots are the current injection points, and the hollow dots are the sensor placement points. Under...

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Abstract

The invention discloses a substation grounding grid impact diffusion characteristic test device which comprises an impact current generator (10) which is connected to grounding grid (30) impact current injection points by using a conductive wire (20), a plurality of open-close type current sensors (40) which are distributed at the intersection points of a plurality of circles with the impact current injection points as centers and the change lengths of equidifferent change as radii, a measurement system (60) which is connected to the plurality of open-close type current sensors (40) through a signal cable (50), a monitoring system (70) which comprises a laptop computer (701) and a wireless router (702) which are interconnected, and an insulation device (80) which comprises an insulating pad (802) arranged under the measurement system and epoxy tubes (801) which are used as the connection wires between devices and the brackets of the signal cable. According to the device, the error in a measurement process can be effectively reduced, and the efficiency of a field test is improved.

Description

technical field [0001] The invention relates to a testing device for the impact dispersion characteristic of a substation grounding grid under the action of an impact current. Background technique [0002] The grounding grid is one of the important measures to ensure the safe and reliable operation of electrical installations. When the substation is struck by lightning or affected by lightning intrusion waves, the grounding grid that meets the requirements can make the impact current flow into the ground quickly, and at the same time ensure that the scattered current in the grounding grid is evenly distributed to ensure the safety of electrical equipment and staff. Because the lightning current has the characteristics of large amplitude, wide frequency domain and short time, the characteristics of the grounding grid under the impact of power frequency and lightning current are very different. If the impact grounding resistance of the substation grounding grid does not meet ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 肖磊石李谦周文俊杨帅黄佳瑞喻剑辉
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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