A method and instrument for on-site verification of a neutral point grounding device in a multifunctional distribution network

Abstract

A method and instrument for calibrating a neutral point grounding device of a multifunctional distribution network, which simulates a high-resistance grounding fault of a distribution network and Fault characteristic quantity of low-resistance ground fault; simulate permanent ground fault and instantaneous ground fault of distribution network by adjusting three-phase voltage value, neutral point voltage value, zero-sequence current value of each circuit and duration of zero-sequence current of circuit and the fault feature quantity of disconnected grounding fault; by adjusting the capacitance and its change of the adjustable capacitor module to simulate the capacitance current of the distribution network and the state characteristic quantity of the change; for different types of neutral point grounding devices of the distribution network After the secondary circuit of the distribution network neutral point grounding device inputs the distribution network simulated ground fault characteristic quantity or the simulated state characteristic quantity, the logic function and wiring correctness of the distribution network neutral point grounding device are verified.

Description

Technical field[0001]The present invention is a field verification method and instrument of the distribution mesh neutral interface device, which is mainly used for the field functional verification and preventive test of the neutral point of the distribution network.Background technique[0002]The distribution network neutral point device is a product that is widely used in single-phase fault processing of the distribution network. Such products have automatic tracking compensation coils, fault phase transfer grounding devices, resistive grounding devices, and dynamic grounding devices. For such products, some functional tests can be made in the power distribution simulation laboratory, but once these products are installed on site, they cannot do functional tests for such products due to lack of test methods. Only for products The components do some insulation test items, so that the function of the product is lacking supervision. After the distribution network neutral point is inst...

AI Technical Summary

Problems solved by technology

For such products, some functional tests can be done in the power distribution simulation laboratory in the laboratory. Do some insulation test items for the parts, so that there is no supervision on the function of the product

After the neutral point grounding device of the distribution network is installed on site, or after a certain period of operation, due to transportation and installation reasons, and the drift of the working point of the electronic components, the logic function of the device will change, what's more, The secondary circuit will cause the neutral point grounding device of the distribution network to fail to work due to wrong wiring

These are the main reasons leading to the failure of the neutral point grounding device of the distribution network to perform well. Therefore, a field verification method or instrument suitable for various types of distribution network neutral point grounding devices has been developed and applied to various It is very necessary to check the neutral point grounding device of various types of distribution network on site

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