Method for inspecting current loop of main transformer sleeve by using zero lifting flow

Abstract

The invention discloses a method for inspecting a current loop of a main transformer sleeve by using zero lifting flow. The method comprises the following steps of: correspondingly connecting an A phase loop, a B phase loop and a C phase loop which are output by a three-phase voltage regulator to an A phase loop, a B phase loop and a C phase loop of a primary three-phase loop on the 110kV side of a main transformer by using a test wire respectively; inspecting a secondary current amplitude value and a phase angle of a sleeve type current transformer on the 110kV side and current of a neutral wire by using voltage UA of a primary A phase loop as a reference vector at an on-site terminal box and a control chamber screen cabinet; and finally, inspecting a secondary current amplitude value and a phase angle of a sleeve on a 220kV side and the current of the neutral wire by using the voltage UA of the primary A phase loop as the reference vector at the on-site terminal box and the control chamber screen cabinet, and analyzing and judging data to judge whether the loops are correct or not. By the method, the polarity, the transformation ratio and the wiring condition of an alternating current loop of the main transformer sleeve can be inspected by the zero lifting flow to find a secondary loop connecting wire which is not connected or is connected by mistake.

Description

technical field [0001] The invention belongs to the field of electrical technology, and is especially used for carrying out a zero-up current test on the main transformer before the substation is put into operation, to detect the AC current amplitude and phase angle of the bushing current loop, to judge whether the loop is correct through the data, and to ensure the wiring of the loop method of correctness. Background technique [0002] Electricity has become an indispensable life necessity for people. Substation is an important part of power transmission. The correctness of the AC current circuit of the main transformer bushing will affect the safety and stability of the power grid, affect the normal supply of power and the normal operation of people. Life. [0003] Before the substation is live and put into production, there are two methods for checking the current loop from zero current up. The first method is to use the lamp transformer to perform a current boost on the...

AI Technical Summary

Problems solved by technology

Due to the lack of generator power in the substation, this method cannot be used to test the current loop

Images