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Distance protection method

A distance protection and distance relay technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of the distance protection protection range cannot be determined, the distance protection cannot work, etc., and achieve the effect of high reliability

Active Publication Date: 2013-02-27
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Due to the large L1, the protection range of the distance protection cannot be determined, so the current distance protection cannot work for the line installed with the fault current limiter

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Figure 5 It is a flowchart of a distance protection method according to an embodiment of the present invention.

[0025] refer to Figure 5 , a distance protection method includes the following steps:

[0026] In S501, a low fixed value distance relay is provided, and the low fixed value distance relay outputs a first signal;

[0027] In S503, a high-set distance relay is provided, and the high-set distance relay outputs a second signal;

[0028] In S505, a delay relay is provided, and the delay relay receives the first signal and outputs a third signal;

[0029] In S507, a latch is provided, the latch receives the first signal, and the second signal passes through a NOT gate as a reset signal of the latch;

[0030] In S509, a logic and operation unit is provided, the logic and operation unit receives the output signal and the second signal of the above-mentioned latch, and outputs a fourth signal; and

[0031] In S511, a logic or operation unit is provided, the l...

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Abstract

The invention proposes a distance protection method, which comprises the following steps: providing a low constant value distance relay to output a first signal; providing a high constant value distance relay to output a second signal; providing a delay relay to receive the first signal and output a third signal; providing a latch to receive the first signal, wherein the second signal passes through a NOT gate to be used as a reset signal of the latch through; providing a logic and arithmetic unit to receive an output signal and the second signal of the latch and output a fourth signal; and providing a logic or arithmetic unit to receive the third signal and the fourth signal and output a distance protection signal.

Description

technical field [0001] The present invention relates to the distance protection method, and in particular to a distance protection method suitable for ultra-high voltage lines with fault current limiters (FCL). Background technique [0002] At present, there are many measurement principles for ultra-high-voltage lines. The distance protection using the voltage and current on one side of the line is widely used in the protection of ultra-high-voltage lines in current systems because it does not require additional communication. [0003] Distance protection is a protection device that reflects the electrical distance (impedance) between the fault point and the protection installation point, and determines whether to operate or not according to the distance. As a protection principle with relatively complete performance, distance protection has been widely used in high-voltage power grids with complex structures. [0004] by figure 1 Take the distance protection installed at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 沈冰鲍伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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