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Method of realizing synchronization of sampling values of double circuit lines on the same tower by using fault opposite negative phase-sequence current phase characteristics

A double-circuit line, negative sequence current technology, applied in the direction of measuring current/voltage, emergency protection circuit devices, electrical components, etc., can solve the problems of complex processing process, large amount of calculation, poor practicability, etc., to achieve simple algorithm principle, calculation Small volume, strong practical effect

Inactive Publication Date: 2016-08-24
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first type of method has poor practicability due to the complex processing process, large amount of calculation and long time-consuming data processing.
The second type of method ignores the impact of uneven sampling time intervals on measurement results, resulting in errors in sampling synchronization

Method used

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  • Method of realizing synchronization of sampling values of double circuit lines on the same tower by using fault opposite negative phase-sequence current phase characteristics

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Embodiment Construction

[0012] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0013] figure 1 It is a schematic diagram of a double-circuit line power transmission system on the same pole parallel to the application of the present invention. The protection devices in this embodiment are respectively installed in the m-terminal substation and the n-terminal substation of the parallel double-circuit line on the same pole. The sampled values ​​of the m-terminal voltage transformer CVT and current transformer CT of the parallel double-circuit line on the same pole are directly transmitted to the m-terminal substation protection device applying the method of the present invention without delay through the secondary cable. The sampling values ​​of the n-terminal voltage transformer CVT and current transformer CT of the double-circuit lines paralleled on the same pole are transmitted without delay to the n-terminal substation pr...

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Abstract

The invention discloses a method of realizing synchronization of sampling values of double circuit lines on the same tower by using fault opposite negative phase-sequence current phase characteristics. The method includes measuring three-phase current phasor of circuit line I and circuit line II at the ends m and n of the double circuit lines on the same tower, decomposing the measured three-phase current phasor by using a six-sequence component method to obtain fault opposite negative phase-sequence current, and selecting the end n AC electrical quantity transmitted to an end m substation protective device at a specific sampling moment and the end n AC electrical quantity acquired at the end m substation protective device at the sampling moment t as synchronization data for relay protection calculation. Zero error of synchronization of double-end AC electrical quantity current sampling values of double circuit lines on the same tower is realized, the algorithm is simple in principle, increased operation of a computer is minimal, and the action speed of relay protection of double circuit lines on the same tower is not affected. The method is highly practical.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for synchronizing sampled values ​​of parallel double-circuit lines on the same pole by utilizing the reverse negative-sequence current phase characteristics of opposite faults. Background technique [0002] Due to the randomness and dispersion of the CPU's response time to the interrupt proposed by the hardware synchronization link, there is an error in the sampling synchronization accuracy, which is an inherent defect of the hardware synchronization sampling method. The AC sampling synchronization methods used in relay protection are mainly divided into two categories. One is to reduce the measurement error by processing the sampling data or correcting the measurement results when the synchronization error is constant; the second is to reduce the measurement error by Reducing the synchronization error reduces the measurement error. The f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H02H7/26
CPCG01R19/00H02H7/267
Inventor 陈敏蔡方伟姚志涵
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD