Detection method of digital substation PT secondary nuclear phase checking

Abstract

The invention relates to a detection method of digital substation PT secondary nuclear phase checking, which comprises nuclear phase checking in the same voltage class and nuclear phase checking in different voltage classes; for the nuclear phase checking in the same voltage class, a power transformer or a digital fault recorder are utilized to check nuclear phases at consolidators in the same voltage class; for the nuclear phase checking in different voltage classes, nuclear phase is checked at a protecting panel of a transformer which is utilized to measure and display the angular differences and amplitude differences between the high voltage side and the medium voltage side and between the high voltage side and the low voltage side after buses in different voltage classes are electrified, and the nuclear phase checking of the medium voltage side and the low voltage side thereof can be realized by step (1), therefore, the nuclear phase checking at the time of the whole digital substation being started can be completed. The invention can meet the detection requirement of digital substation PT secondary nuclear phase checking, and has the advantages of accurate detection and easy operation.

Description

Technical field [0001] The invention relates to a PT secondary nuclear phase detection method in a substation, in particular to a digital substation PT secondary nuclear phase detection method. Background technique [0002] At present, in substations using electromagnetic or capacitive voltage transformers (PT), the steps for PT secondary phase verification and phasing are as follows: 1. The high-voltage side power supply is charged with the A-phase power supply and measured with a PT secondary multimeter The A phase voltage is 57.7V, the other two phases have no voltage; 2. The high voltage side power supply has charged the B phase power supply, and the B phase voltage measured with a PT secondary multimeter is 57.7V, and the other two phases have no voltage; 3. High voltage side The power supply has been charged with a three-phase power supply, and the voltage of phase A, B, and C is 57.7V measured with a multimeter on the PT secondary, and a multimeter is used to measure U AB ...

AI Technical Summary

Problems solved by technology

[0003] However, the current digital substations use electronic voltage transformers (EVT), which cannot use multimeters and phase sequence meters to determine the phase sequence and phase of the substation, so conventional electromagnetic or capacitive voltage transformers cannot be used The nuclear phase method of the device is used to complete the nuclear phase work