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A mid-section impedance protection method suitable for half-wave transmission lines

A transmission line and impedance protection technology, applied in emergency protection circuit devices, measuring electricity, electrical components, etc., can solve problems such as failure, inability to distinguish near faults and remote faults, and achieve simple implementation and high reliability. and high sensitivity and reliability

Active Publication Date: 2019-06-04
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional distance protection cannot distinguish near-field faults from far-end out-of-zone faults (attached image 3 ), thus failing

Method used

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  • A mid-section impedance protection method suitable for half-wave transmission lines
  • A mid-section impedance protection method suitable for half-wave transmission lines
  • A mid-section impedance protection method suitable for half-wave transmission lines

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Embodiment Construction

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0045] The present invention provides a middle-section impedance protection method suitable for half-wave transmission lines. Using the steady-state solution of uniform transmission line dust prevention, the compensation voltage along the half-wave transmission line can be deduced from the excessive voltage and current at the installation point of the protection device. and the compensation current, so that the compensation impedance along the line can be determined, an example of which is figure 2 As shown, specifically:

[00...

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Abstract

The invention provides a middle-segment impedance protection method suitable for a half-wave transmission line. The method comprises the following steps: (1) calculating an impedance magnitude, as shown in the specification, of a measurement point in the half-wave transmission line; (2) calculating a compensation impedance magnitude, as shown in the specification, of a middle point of the half-wave transmission line; (3) determining a variation, as shown in the specification, of the compensation impedance magnitude; and (4) distinguishing a middle-segment impedance protection action of the half-wave transmission line. Compared with the prior art, the middle-segment impedance protection method suitable for the half-wave transmission line has the advantages that only single-end electric quantity is utilized, the method is independent on a communication channel, backup protection of the middle segment of the line can be relatively well achieved and the method has relatively high reliability and sensitivity and is simple to implement, clear in criterion and high in reliability.

Description

technical field [0001] The invention relates to the technical field of half-wave AC power transmission, in particular to a middle-section impedance protection method suitable for half-wave power transmission lines. Background technique [0002] Half Wavelength AC Transmission (HWACT) refers to the ultra-long-distance three-phase AC transmission whose electrical distance is close to a power frequency half-wave, that is, 3000 kilometers (50 cycles). In large countries, HWACT is an attractive transmission option. In order to send large hydropower in the Amazon Basin to the load center, Brazil has studied HWACT, which is considered to be very competitive. South Korea has also studied the use of HWACT to send Siberia's hydropower to South Korea. [0003] Recently, the world is facing the challenge of climate change, and ultra-long-distance high-power power transmission is on the agenda again. Half-wavelength AC power transmission technology has attracted attention due to its un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/088H02H7/26
Inventor 杜丁香柳焕章周泽昕李肖郭雅蓉王兴国
Owner CHINA ELECTRIC POWER RES INST
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