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Method for realizing line phase check by using programmable logic controller (PLC)

A line and phase separation technology, applied in the direction of phase sequence/synchronization indication, etc., can solve problems such as unsatisfactory phase separation verification, complex electromagnetic environment in space, etc.

Active Publication Date: 2013-09-25
STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Different from ordinary calibration of a section of uncharged wire with the ohm gear of a multimeter, a section of overhead transmission line often needs to go through a distance of tens to hundreds of kilometers. During this period, it has undergone numerous phase changes, and the electromagnetic environment of each phase wire is complex. , a very high voltage will be induced between the phase wires and between each phase and the ground, and the ordinary conduction method can no longer meet the needs of phase-specific calibration.

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  • Method for realizing line phase check by using programmable logic controller (PLC)
  • Method for realizing line phase check by using programmable logic controller (PLC)
  • Method for realizing line phase check by using programmable logic controller (PLC)

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Embodiment 1

[0034] The invention is a method for realizing line phase difference verification by using PLC, using DC power supply for signal transmission, using relay action and contact output to programmable controller PLC to realize logic function, and achieving the purpose of distinguishing phase sequence indication results.

[0035] Such as Figure 1-Figure 6 As shown, the method of using PLC to realize line phase difference verification is as follows:

[0036] First, connect the three terminals at one end of the three-phase transmission line to the three terminals on the PLC phase difference checker;

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Abstract

The invention belongs to the technical field of construction of a three-phase transmission line of a power system and in particular relates to a method for realizing line phase check by using a programmable logic controller (PLC). Two ends of the three-phase transmission line are respectively connected to a PLC phase checker, the motion of a relay is measured, a measurement result is transmitted to the PLC phase checker, the PLC phase checker performs operation, and a connection point which is output by the PLC lightens a measurement result display light character board 1 on the PLC phase checker to display the measurement result. The method has the advantages that: by adopting a direct current working voltage mode, the problem about alternating current induced voltage of the three-phase transmission line under a complicated electromagnetic environment is solved; a phase distinguish logic relationship is realized by a logic matrix of the PLC; the wiring working amount of a secondary loop can be greatly reduced; the PLC has a simple programming program and is easy to manufacture; and a quick phase check function can be realized, the phenomenon of phase errors is avoided, and working efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of construction of three-phase transmission lines in electric power systems, and in particular relates to a method for realizing line phase difference verification by using PLC. Background technique [0002] In the construction of an overhead transmission line in the power system, because the three-phase transmission line needs to change phases continuously during the tower erection process in the air, it is difficult to distinguish the corresponding relationship between the three phases at both ends of the line, which can easily cause power transmission. When the phase sequence error phenomenon is found, it will directly cause the "wrong phase" phenomenon between one end and the other end of the three phases caused by continuous commutation. [0003] Therefore, it is very necessary how to carry out the correct nuclear phase work before power transmission to ensure that the power transmission is successful ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/18
Inventor 陶永茂李安平
Owner STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER