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Distance protection method and system

A technology for distance protection and installation, which is applied in the field of power system relay protection equipment, and can solve the problems of difficult real-time adjustment and control and difficult application.

Active Publication Date: 2017-08-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these technical solutions need to use communication channels to transmit line-to-end information, so there are problems of real-time adjustment control and practical application.

Method used

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  • Distance protection method and system

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.

[0054] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but covers all modifications, equivalents, and alternatives falling within the scope of the disclosure. Throughout the description of the figures, the same reference numerals denote the same elements.

[0055] Also, it should be understood that as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Also it will be understood that when a component or unit is referred to as being “connected” or “coupled” to another component or unit, it can be directly connected or coupled to the other component or ...

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Abstract

A distance protection method and system, the distance protection method comprising: A, collecting the voltage at the distance protection installation place Current at distance protection installation Negative sequence current at distance protection installation Zero-sequence current at distance protection installation The setting value of distance protection and the impedance angle of the line where the distance protection is located B. According to the collected signal in step A, determine the fault impedance Z f ; C. According to the fault impedance Z f and distance protection setting value to determine whether to send a trip signal or a blocking signal. By using the distance protection method and system of the present invention, the influence of transition resistance can be avoided, and the distance protection can operate correctly in various situations.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to power system relay protection equipment and methods. Background technique [0002] Distance protection is a protection device that reflects the distance or impedance between the fault point and the distance protection installation, and determines the action time according to the distance. The main component of the device is a distance or impedance relay, which can measure the impedance value between the distance protection installation and the short-circuit point according to the voltage and current applied to its terminals. This impedance is called the measured impedance of the relay. When the short-circuit point is close to the protection installation, the measurement impedance is small and the action time is short; when the short-circuit point is far away from the protection installation, the measurement impedance increases and the action time increases, thus ensuring th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 马静马伟陈亦骏孙吕祎
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)