Unsymmetrical fault relay protection method of distributing line

A distribution line, asymmetric technology, applied in emergency protection circuit devices, electrical components and other directions, can solve problems such as poor fault isolation reliability, distribution line fault isolation method can not meet the requirements of users for safe and reliable power supply, etc., to solve the fault The effect of prolonged isolation

Active Publication Date: 2012-08-22
北京清源继保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the fault isolation method of the feeder terminal unit and the communication network, the determination of the fault section depends on the information interaction between the communication network and the

Method used

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  • Unsymmetrical fault relay protection method of distributing line
  • Unsymmetrical fault relay protection method of distributing line
  • Unsymmetrical fault relay protection method of distributing line

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Embodiment Construction

[0010] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.

[0012] figure 1 The protection flow diagram is shown.

[0013] Step 1, fault detection, real-time detection of voltage and current on the distribution line, if any phase current is greater than the set value, or any phase voltage is lower than the set value, it is judged that a fault has occurred on the distribution line. The current setting value can be taken as the maximum load current on the line...

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Abstract

The invention discloses an unsymmetrical fault relay protection method of a distributing line, which comprises the steps of firstly performing fault detection and detecting whether faults occur on the distributing line based on the current and the voltage; secondly performing unsymmetrical fault recognition and recognizing whether the faults are unsymmetrical faults based on the relation between three-phase current and the voltage; thirdly performing fault direction judgments and judging fault directions based on the relation between the voltage and the current; fourthly performing time limiting protection which comprises time limiting excess current protection and time limiting low voltage protection, measuring a relation motion of the current and the setting current, and measuring a relation motion of the voltage and the setting voltage; and fifthly performing mutation protection which comprises current mutation protection and voltage mutation protection and judging whether a mutation motion of the voltage or the current occurs based on a setting time and within a setting time range. The unsymmetrical fault relay protection method of the distributing line can achieve rapid and selective isolation of unsymmetrical faults of single-power supply type and radial distributing lines.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for relay protection of distribution lines. Background technique [0002] Distribution lines (also known as feeder lines, feeders) are an important part of the power distribution system. After the distribution line fails, automatically detecting and cutting off the faulty section is the premise to ensure the reliability of power supply for users. [0003] At present, there are two main categories of distribution line fault isolation. One is current protection, which also includes current quick-break protection and definite time over-current protection. When a fault occurs on the distribution line, based on the increase in current, the current quick-break protection isolates the fault instantaneously, and the definite time overcurrent protection isolates the fault after a set time delay. The current quick-break protection can quickly isolate the fault, but it will inevitab...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 董新洲施慎行
Owner 北京清源继保科技有限公司
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