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Distance protection method and system

A distance protection and installation technology, applied in the field of power system relay protection equipment, can solve the problems of complex system, low precision, and improve the ability of distance protection to resist transition resistance.

Active Publication Date: 2015-03-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above two types of protection schemes have their advantages over the general distance protection, but in the process of scheme construction, the voltage information of the fault point is not used to improve the anti-transition resistance ability of the distance protection, so there are problems such as complex system and low precision.

Method used

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.

[0052] 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.

[0053] 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

The invention discloses a distance protection method and system. The distance protection method includes the steps that A, the voltage Um at the distance protection installation position, the current Im at the distance protection installation position, the negative-sequence current Im2 at the distance protection installation position, a distance protection setting impedance boundary value ZMN and the impedance angle thetaline of a circuit where distance protection is located are collected; B, the measurement impedance Zm and self-adaptation distance protection setting impedance at the distance protection installation position are determined according to the collected signals in the step A; C, whether a trip signal or a blocking signal is sent is determined according to the measurement impedance Zm and self-adaptation distance protection setting impedance at the distance protection installation position. Through the distance protection method and system, influence of a transition resistor on distance protection can be eliminated, and correct actions of distance protection can be realized.

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 Applications(China)
IPC IPC(8): H02H7/26
Inventor 马静闫新林一峰刘畅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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