Method for limiting secondary arc current for untransposed transmission line with extra-high voltage

A transmission line and submerged current technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of large submerged current of UHV non-transposition lines. problems, to achieve the effect of increasing the difficulty of manufacturing

Inactive Publication Date: 2012-06-20
STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the background technology, to provide a new measure for limiting the submerged current of UH

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  • Method for limiting secondary arc current for untransposed transmission line with extra-high voltage
  • Method for limiting secondary arc current for untransposed transmission line with extra-high voltage
  • Method for limiting secondary arc current for untransposed transmission line with extra-high voltage

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Example Embodiment

[0020] Three-phase unbalanced high reactance plus small reactance is used to limit the potential supply current of non-transposed UHV lines. The wiring method adopts three-phase unequal high reactance at its neutral point plus small reactance to ground, as shown in Figure 3(a). Show.

[0021] Due to the phase-to-phase distance of the three-phase conductors (in l AB , l BC , l CA means) are not equal, taking the horizontal arrangement of wires as an example, l AB =l BC ≠l CA , then the phase-to-phase capacitance of the wires is unequal, that is, C in Figure 3(a) AB =C BC ≠C CA . To compensate for the phase-to-phase capacitance, the relationship between the phase-to-phase reactance in parallel with the capacitance is X 12 =X 23 ≠X 13 , as shown in Figure 3(b). Reactance X in Figure 3(b) L1 , X L2 , X L3 Compensate the A-phase, B-phase and C-phase line-to-ground capacitances respectively; convert Fig. 3(b) into Fig. 3(a) equivalently. In this way, a solution of th...

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Abstract

The invention relates to a novel measure for limiting a secondary arc current of an untransposed transmission line with extra-high voltage, belonging to the technical field of extra-high voltage. The invention aims to provide a novel measure for limiting the secondary arc current of the untransposed transmission line with extra-high voltage aiming to overcome deficiency of the background art so as to solve the problem that the secondary arc current of the untransposed transmission line with the extra-high voltage is high. And the novel measure has stronger practicality and economical efficiency.

Description

technical field [0001] The invention relates to a method for limiting the submerged current of an ultra-high voltage transmission line, which belongs to the technical field of ultra-high voltage. Background technique [0002] The latent supply current of the transmission line is the induced current generated at the line fault point by the normal operation of the conductor through the phase-to-phase capacitance and phase-to-phase inductance when a ground fault occurs in a certain phase conductor. The latent supply current is composed of electrostatic induction component (interphase capacitive coupling) and electromagnetic induction component (interphase inductive coupling), of which the electrostatic induction component accounts for the main part. When the value of the latent supply current is large, it is not conducive to the stability of the power system, and measures need to be taken to limit it. Generally, there are two main measures to limit the submerged supply current...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H7/26
Inventor 李振强谷定燮戴敏娄颖何慧雯李志军范冕王磊万磊
Owner STATE GRID ELECTRIC POWER RES INST
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