Power transmission line negative sequence current and negative sequence voltage phasor measurement method
A negative-sequence current and transmission line technology, applied in the direction of measuring current/voltage, phase angle between voltage and current, measuring device, etc. problem, to achieve the effect of less computation, improved action speed, and fast calculation speed
Active Publication Date: 2015-12-30
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology
However, when the existing relay protection device extracts the negative-sequence voltage phasor and negative-sequence current phasor, it needs to involve complex complex calculations, and the amount of calculation is large. The time occupies a large part of the action time of the relay protection device, which seriously restricts the improvement of the action speed of the relay protection device and brings security risks to the power grid.
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[0024] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0025] figure 1 It is a schematic diagram of the power transmission system applying the present invention. figure 1 CVT is a voltage transformer, and CT is a current transformer. In this embodiment, the protection device measures the A, B, and C three-phase voltage phasors at the place where the transmission line protection is installed And A, B, C three-phase current phasor
[0026] The protection device will A, B, C three-phase voltage phasor And A, B, C three-phase current phasor Transform to the voltage phasor under the αβ0 coordinate axis and current phasor
[0027] U · α U · ...
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The invention discloses a power transmission line negative sequence current and negative sequence voltage phasor measurement method. According to the method, a three-phase voltage phasor and a three-phase current phasor of a power transmission line relay location are firstly measured, alpha-beta0 coordinate axis conversion is performed on the three-phase voltage phasor and the three-phase current phasor so that a voltage phasor and a current phasor under an alpha-beta0 coordinate axis can be obtained, a negative sequence voltage phasor and a negative sequence current phasor under the alpha-beta0 coordinate axis are calculated, alpha-beta0 coordinate axis inverse conversion is performed on the negative sequence voltage phasor and the negative sequence current phasor under the alpha-beta0 coordinate axis so that a three-phase negative sequence voltage phasor and a three-phase negative sequence current phasor of the power transmission line relay location can be obtained. The method does not involve complicated complex operation, is simple in algorithm principle and high in calculation speed, and can greatly increase the relay protection action speed.
Description
technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for measuring the negative-sequence current and negative-sequence voltage phasor of a transmission line. Background technique [0002] With the improvement of ultra-high voltage power grid construction and the large-scale construction of UHV AC transmission lines, more and more attention has been paid to the safety of power grids, and relay protection devices are required to have higher action speeds, which can quickly isolate faults after power grid transmission lines fail. Make sure the fault doesn't propagate. However, when the existing relay protection device extracts the negative-sequence voltage phasor and negative-sequence current phasor, it needs to involve complex complex calculations, and the amount of calculation is large. The time occupies a large part of the action time of the relay protection device, which seriously restricts...
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IPC IPC(8): G01R25/00G01R19/00
Inventor 曾惠敏
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD