Method for measuring phase of power transmission and distribution line

Abstract

The invention discloses a method for measuring phase of a power transmission and distribution line, which comprises the following steps of suspending a set of three-phase short circuit grounding wire on both of two side lines on a outlet line knife switch or a cable head of a transformer station to be measured; supposing two sides of the line as an A transformer station and a B transformer station; supposing each phase on the A side and the B side of the line as A phase, B phase and C phase; supposing the B transformer station as a known system phase, the phase of the A transformer station as a to-be-measured phase; performing the testing work in the A transformer station; detaching the three-phase short circuit grounding wire of the A transformer station on the line; orderly detaching grounding conducting wires of the B transformer station on the line; remotely measuring resistance, namely measuring the phase under the condition that the two ends of the line are not electrified; ensuring that the phase of the line is matched with that of the system; and remotely measuring the insulating resistance value between the conducting wire and the ground.

Description

technical field [0001] The invention relates to a phase measurement method, in particular to a phase measurement method of power transmission and distribution lines. Background technique [0002] Due to the limited operating conditions of electrical equipment, it is required that the phase measurement work must be done before the transmission and distribution lines are put into operation. Newly erected transmission and distribution lines, due to corners, segments, transpositions, etc., especially when cables are connected at both ends, are more likely to cause phase jumps, and even line segments may not be connected. common situation. To measure the phase, generally a nuclear phase detector is used, but it must be tested at a certain disconnection point when there is power on both sides of the line. It is not convenient to transmit power to both ends of some lines below 35KV. In the case of lack of power at one end, Phase comparison measurements cannot be performed. ...

AI Technical Summary

Problems solved by technology

Newly erected transmission and distribution lines, due to corners, segments, transpositions, etc., especially when cables are connected at both ends, are more likely to cause phase jumps, and even line segments may not be connected. common situation

To measure the phase, generally a nuclear phase detector is used, but it must be tested at a certain disconnection point when there is power on both sides of the line. It is not convenient to transmit power to both ends of some lines below 35KV. In the case of lack of power at one end, It is not possible to perform phase comparison measurements

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