RTDS-based test method for arc grounding line selection device

A technology of grounding line selection and testing method, which is applied in the direction of fault location and fault detection according to conductor type, etc., which can solve problems such as fault expansion, threat to electrical equipment insulation, and influence on power grid security, so as to improve the accuracy of the test and make the test environment real , The system is flexible and changeable

Active Publication Date: 2018-07-03
NANJING NARI GROUP CORP +1
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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

Method used

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  • RTDS-based test method for arc grounding line selection device
  • RTDS-based test method for arc grounding line selection device
  • RTDS-based test method for arc grounding line selection device

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0031] A test method for an RTDS-based arc-light grounding line selection device, the test device includes an RTDS system, a power amplifier, and an arc-light grounding line selection device;

[0032] The test method includes the following steps:

[0033] Step 1: Protect the electrical primary system network at the installation site, such as figure 1 As shown, S1 and S2 are 110kV equivalent power sources, and there are four outgoing lines on the secondary 35kV buses of main transformers T1 and T2, among which L1, L2, L3, and L4 are 1M bus branches, and L12, L13, L14, and L15 are 2M bus branch. K1~K26 are the fault points, among which K1 and K14 are the fault points on the 1M and 2M buses resp...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 徐智晶盛立健杨洪涛杨佳韦芬卿付磊蔡小辰
Owner NANJING NARI GROUP CORP
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