Distributed parameter measurement impedance-based relay protection method for single-phase grounding fault of power transmission line

A single-phase ground fault and transmission line technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve the problem of large measurement errors, ground impedance distance protection malfunction or refusal, and safe and stable operation of the power grid Disadvantages and other problems, to achieve a strong tolerance effect

Inactive Publication Date: 2012-10-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In fact, except for artificially constructed short circuits, the voltage at the ground fault point is almost impossible to be zero, and the voltage at the ground fault point will have a serious impact on the measurement of fault impedance, especially for high-impedance ground faults under heavy load conditions, and the measurement error is very large. It is easy to cause the traditional grounding impedance distance protection to malfunction or ref

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  • Distributed parameter measurement impedance-based relay protection method for single-phase grounding fault of power transmission line
  • Distributed parameter measurement impedance-based relay protection method for single-phase grounding fault of power transmission line
  • Distributed parameter measurement impedance-based relay protection method for single-phase grounding fault of power transmission line

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[0025] The present invention proposes a relay protection method for a single-phase ground fault of a transmission line based on distributed parameter measurement impedance. With reference to the accompanying drawings, the following gives a detailed description of the embodiment and a specific operation process:

[0026] The 500kV ultra-high voltage power transmission system model applying the present invention is as figure 1 As shown, the system is a typical double-ended power supply system, with bus bars on both sides of m and n respectively, and the total length of the transmission line is 300km, divided into two sections, namely section I of the transmission line and section II of the transmission line. Among them, section I of the transmission line is 200km long, and section II of the transmission line is 100km long. The protection device is installed at the m end of section I of the transmission line. The phase angle difference of the equivalent power supply on both sides o...

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Abstract

The invention discloses a distributed parameter measurement impedance-based relay protection method for a single-phase grounding fault of a power transmission line. The method comprises the following steps that: fault-phase distributed parameter measurement impedance Zphi,ce is directly calculated by utilizing fault-phase voltage, fault-phase current, fault-phase negative-sequence current and zero-sequence current of a protector mounting position and parameters of the power transmission line; and if the amplitude of the fault-phase distributed parameter measurement impedance is lower than a set impedance value, and a phase angle of the fault-phase distributed parameter measurement impedance is within the range of 45 to 135 degrees, a protector transmits a tripping signal, otherwise the protector does not act.

Description

technical field [0001] The invention relates to the technical field of relay protection of power systems, in particular to a relay protection method for single-phase ground faults of transmission lines based on impedance measurement of distributed parameters. Background technique [0002] Relay protection is the first line of defense to ensure the safe and stable operation of the power grid. Whether it can act accurately and quickly plays a vital role in isolating faults in time and effectively preventing accidents from spreading. Impedance distance protection has been widely used in power system transmission line protection because it is less affected by power system operation mode and structural changes, and can selectively remove various faults in transmission lines instantly, and has a long and stable protection range. However, the premise of traditional ground impedance distance protection is that the ground fault point voltage is zero, and the fault impedance is measur...

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Application Information

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IPC IPC(8): H02H7/26G01R27/08
Inventor 曾惠敏王永明郑志煜吴善班佘剑锋潘立志俞书献
Owner STATE GRID CORP OF CHINA
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