A test method of arc light grounding line selection device based on rtds

Abstract

The invention discloses an RTDS-based test method for an arc grounding line selection device. A closed-loop environment for testing an arc grounding line selection device based on an RTDS is constructed. In the simulation environment, a same mathematical model can be created according to power primary system network at a protection installation part, the test method is more targeted and more customized, and a test environment is more realistic. The RTDS is taken as a digital dynamic model test tool, the output electrical quantity of the RTDS comprises a transient component, the waveform is closer to a waveform in a real failure in a grid, various types of short-circuit faults can be simulated, through the construction of a control logic, a fault waveform in intermittent arc grounding can be restored more realistically, and the test of the arc grounding line selection device is completed. By using the test method, the operational reliability of the arc grounding line selection device after site operation can be greatly improved.

Description

technical field [0001] The invention relates to a test method of an RTDS-based arc light grounding line selection device, belonging to the technical field of power system protection device testing. Background technique [0002] The small current grounding system refers to the power system in which the neutral point is not grounded, the arc suppressing coil is grounded, or the high-resistance grounding method is used. Most domestic power grids of 66kV and below adopt this wiring method. The single-phase ground fault has the highest fault probability in the small current grounding system. However, when a single-phase ground fault occurs in the system, since no short circuit is formed, the ground fault current is smaller than the load current, and the three-phase line voltage is here In the case of such a fault, the symmetrical relationship is still maintained, and it does not affect the continuous power supply to the load, so it is not required to trip immediately, but the pha...

AI Technical Summary

Problems solved by technology

However, the increase of the capacitive current makes it impossible to reliably extinguish the arc as before when the single-phase is grounded, which will further expand the fault into a short circuit between phases and cause the circuit breaker to trip.

In addition, at the same time, the hazard of intermittent arc grounding overvoltage cannot be ignored. It threatens the insulation of electrical equipment, causes the switch to explode, increases the operating load of the metal oxide arrester and affects the safety of the power grid. It may even cause deformation of the transformer coil, resulting in significant losses

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