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Method for checking phase sequences of lines

A line and phase sequence technology, applied in the direction of phase sequence/synchronous indication, etc., can solve problems such as short circuit between phases, inaccurate power factor detection, and inability to automatically switch on, so as to ensure safe operation, improve power supply reliability, and simple methods.

Active Publication Date: 2013-01-16
STATE GRID CORP OF CHINA +2
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Problems solved by technology

If the phase sequence is wrongly connected, or the phase of the current sampling and the phase of the voltage sampling are in the same phase, the detection of the power factor will be inaccurate, it will not be automatically switched on, and there will also be overcompensation; if it is connected through the power distribution interval Another line running in parallel, without phase verification, if the phase sequence is wrong, the connection will cause a short circuit between phases and cause an accident. Therefore, the phase verification work is very important when the line is put into operation to the substation.

Method used

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  • Method for checking phase sequences of lines
  • Method for checking phase sequences of lines
  • Method for checking phase sequences of lines

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Embodiment Construction

[0014] Such as figure 1 As shown, a line phase sequence check method, through the known phase sequence on both sides of the line, using insulation resistance meter, grounding wire and other tools to measure the insulation resistance value of each phase, to check the correctness of the line construction wiring, take the M side Taking the new or reconstructed line A-phase verification on the N side as an example, the steps are as follows:

[0015] a) Short-circuit and ground the phases B and C on the M side and N side with ground wires respectively ( Figure 1 As shown), use a 5000V insulation resistance meter on the M side to measure the A phase insulation resistance. If the reading is a normal value (not 0), it means that the connection between the M side and the N side of the new or rebuilt line A phase is correct;

[0016] b) If the reading of the 5000V insulation resistance meter in step a) is 0, short-circuit the A and C phases with ground wires on the N side and ground t...

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Abstract

The invention discloses a method for checking phase sequences of lines. The method is used for measuring insulation resistance values of all phases and inspecting the correctness of construction wiring of lines by using tools such as an insulation resistance meter and ground wires according to know phase sequences on two sides of lines. The method is simple and practical, operators can master and use the method easily, whether wiring phase sequences of lines are correct can be determined quickly, problems caused by wrong wiring of phase sequences can be found out timely and rectified in construction phases, and the situation that reworking and rectification are conducted when wrong wiring phase sequences of lines are found out after charged lines are put into operation can be avoided, so that the working efficiency is improved, the on-site labor intensity of workers is reduced, the electricity supply reliability is improved, and the safe operation of power grids can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of power line construction, in particular to a method for checking phase sequence of a line. Background technique [0002] Power transmission is achieved by using a transformer to boost the power generated by the generator, and then connecting it to the transmission line through circuit breakers and other control equipment. The phase sequence needs to be checked after the construction of new 10-220KV lines and reconstructed lines. If the phase sequence of the line is wrongly connected, the consequences will be: the reactive power compensation device has very strict requirements on the input phase sequence of A, B, and C. If the phase sequence is wrongly connected, or the phase of the current sampling and the phase of the voltage sampling are in the same phase, the detection of the power factor will be inaccurate, it will not be automatically switched on, and there will also be overcompensation; if it is ...

Claims

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Application Information

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IPC IPC(8): G01R29/18
Inventor 薛鸿鹏申志远刘亚洲陈全兴陈茜张燕
Owner STATE GRID CORP OF CHINA
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