Electric transmission line interphase fault full-component voltage protection method
A transmission line and voltage protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as impact, low reliability of protection, and inability to apply line protection
Active Publication Date: 2015-01-07
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Problems solved by technology
The line distance protection based on the sudden change is less affected by the system operation mode and has strong anti-transition resistance capability. It cannot play the role of relay protection for the line fault after two weeks of waves, and cannot be applied to the protection of the entire fault process of the line.
Although the line distance protection based on full components can be applied to the protection of the entire fault process of the line, because the self-protection algorithm is seriously affected by the transition resistance, it is easy to cause the protection to refuse to operate or malfunction in the event of a high-impedance ground fault, and the protection reliability is not high.
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[0014] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0015] figure 1 CVT is a capacitor voltage transformer, and CT is a current transformer. The protection device measures the faulted phase-to-phase voltage at the transmission line protection installation , fault phase-to-phase current and normal phase negative sequence current ; Among them, φφ=AB, BC, CA phase, =C, A, B phase.
[0016] Calculate the real part of the voltage drop from the installation of transmission line protection to the phase-to-phase short-circuit fault point and imaginary part :
[0017] Re ( Δ U . f ) = Re ( U . φφ ) - ...
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The invention discloses an electric transmission line interphase fault full-component voltage protection method. The method realizes electric transmission line interphase short circuit fault full-component voltage protection by utilizing the along-the-line voltage drop distribution characteristic, eliminates the influence of the operating method of the system, transition resistance and load current on the protection action performance, and is suitable for protecting the whole fault process of the electric transmission line interphase fault, wherein the along-the-line voltage drop distribution characteristic is as follows: when the fault occurs in a protection area, the along-the-line voltage drop amplitude from a protection mounting position to an interphase short circuit fault point is less than the voltage drop amplitude from the protection mounting position to a protection setting range; and when the fault occurs outside the protection area, the along-the-line voltage drop amplitude from a protection mounting position to the interphase short circuit fault point is more than the voltage drop amplitude from the protection mounting position to the protection setting range.
Description
technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a full-component voltage protection method for phase-to-phase faults of transmission lines. Background technique [0002] Transmission line distance protection can be divided into two types: line distance protection based on sudden change and line distance protection based on full component according to the different electrical quantities used. The line distance protection based on the sudden change is less affected by the system operation mode and has strong anti-transition resistance capability. It cannot play the role of relay protection for the line fault after two weeks of waves, and cannot be applied to the protection of the entire fault process of the line. Although the line distance protection based on full components can be applied to the protection of the entire fault process of the line, because the self-protection algorithm is seriously...
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IPC IPC(8): H02H7/26
Inventor 林富洪曾惠敏
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD