A test system and method for simulating transient earth potential rise

Abstract

The invention discloses a testing system and method for simulating the increase of a transient ground potential, and the testing system comprises a controller MCP, a high-voltage DC power supply HVCD, a capacitor C1, a high-frequency inductor L1, a current-limiting resistor R1, a gas switch K1, a gas switch K2, a current-limiting resistor R2, a wave regulating circuit LR, and a simulation grounding platform SGP. The simulation grounding platform SGP is grounded through the high-frequency inductor L1, and the high-voltage DC power supply HVCD is connected with the capacitor C1 through the current-limiting resistor R1. The gas switch K1 can enable the capacitor C1, the wave regulating circuit LR and the high-frequency inductor L1 to be connected, and the gas switch K2 can enable the capacitor C1, the wave regulating circuit LR, the high-frequency inductor L1 and the current-limiting resistor R2 to be connected. Through different grounding impedance changes, the system can achieve the simulation of the increase phenomena of a grounding network at different stages through employing a controller to control the on / off of different gas switches.

Description

technical field [0001] The present invention relates to a simulation field, and more specifically, to a test system and method for simulating transient ground potential rise. Background technique [0002] Lightning strikes, system failures or switching operations can generate transient overvoltages or overcurrents on the grid or communications. This kind of overvoltage or overcurrent is a kind of disturbance with large energy, which has a great impact on electronic equipment, and is typically manifested as a local potential rise and a reference potential change of the electronic circuit. With the development of smart substations and a large number of projects put into operation, a large number of electronic devices such as sensors and intelligent devices IED are arranged near outdoor primary equipment, so the probability of damage to sensors and electronic devices due to transient ground potential caused by lightning strikes and system failures is obvious. increase. [000...

AI Technical Summary

Problems solved by technology

The test methods for transient ground potential rise can be mainly divided into two categories: one method is to inject the impulse current source or impulse voltage into the real grounding network for measurement at the substation site, and this method requires the voltage of the impulse source to be often It needs to reach 200kV or more, and has a certain impact on the grounding grid of the substation in operation. The test is difficult and costly. At present, only a small amount of tests are carried out when testing the characteristics of the grounding grid in newly-built substations that are not in operation; another method is in the laboratory. In the method of simulating the transient ground potential rise, the impulse current source or impulse voltage is injected into the grounding grid in the laboratory, or a fixed impedance is used to simulate the impedance of the grounding grid

[0004] However, the existing experimental method one is greatly affected by the characteristics of the laboratory grounding grid, and there is a large uncertainty; the second method is a more common method to simulate the grounding grid through a fixed impedance, but the second method cannot fully simulate the impedance of the grounding grid Phenomena such as change

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