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Digital travelling wave protection method for power transmission line and its relay and protection system

A transmission line, traveling wave protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of relay protection sensitivity and action speed limit, etc.

Inactive Publication Date: 2002-07-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of relay protection is implemented by a microcomputer, its action time is generally more than 20 milliseconds. In particular, due to the influence of factors such as transition resistance and current transformer saturation, the sensitivity and action speed of relay protection are greatly affected. limits

Method used

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  • Digital travelling wave protection method for power transmission line and its relay and protection system
  • Digital travelling wave protection method for power transmission line and its relay and protection system
  • Digital travelling wave protection method for power transmission line and its relay and protection system

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Embodiment Construction

[0030] The present invention proposes a digital traveling wave protection method for a power transmission line and an embodiment of the relay and protection system thereof, which are described in detail in conjunction with the accompanying drawings as follows:

[0031] The embodiment of the transmission line digital traveling wave protection system of the present invention is used in a typical transmission line, such as figure 1 As shown, the power system equipment of a typical transmission line includes: transmission line 1, equivalent power system 2, bus bar 3, voltage transformer 4, current transformer 5, high-frequency coupling device 6, high-frequency coupling device 11, line Wave trap 7, circuit breaker 8.

[0032] figure 1 The functions of each component of the power system equipment are described as follows:

[0033] (1) Transmission line 1 is a protected transmission line and also a channel for transmitting high-frequency carrier signals.

[0034] (2) Equivalent po...

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Abstract

A digital travelling wave protecting method for electric power transmission lines and its relay and protection system is disclosed. The said system is composed of digital travelling wave relays containing hardware and firmed software and high-frequency carrier communication unit consisting of high-frequency transceiver and high-frequency carrier channel-power transmission lines. The said method features that the action results of said relays at both ends of a power transmission-line are compared with each other to judge if there is a failure on the line. Its advantages include fast response (5 ms for relay action and 15 ms for protection action).

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to the relay protection technology of high-voltage / ultra-high-voltage transmission lines in power systems. Background technique [0002] Relay protection is an important part of power system. Action speed is an important index to measure the performance of relay protection. At present, a large number of relay protections operating in power systems are basically based on power frequency electrical quantities. When this kind of relay protection is implemented by a microcomputer, its action time is generally more than 20 milliseconds. In particular, due to the influence of factors such as transition resistance and current transformer saturation, the sensitivity and action speed of relay protection are greatly affected. limits. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a transmission ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 董新洲郭效军葛耀中贺家李
Owner TSINGHUA UNIV
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