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A power grid differential protection method and system

A differential protection device and power grid technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems affecting the accuracy of fault judgment, high reliability requirements of network transmission equipment, and complex mechanism of transmission line differential protection. Achieve the effect of optimizing data synchronization mechanism, reducing the chance of error, improving stability and reliability

Active Publication Date: 2020-03-31
广东科瑞德电气科技有限公司
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AI Technical Summary

Problems solved by technology

However, in the prior art, the implementation mechanism of the differential protection of the transmission line is complicated, and the reliability requirements of the network transmission equipment are high.
In addition, the synchronous sampling of data needs to eliminate the communication delay of network communication, which affects the accuracy of fault judgment

Method used

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  • A power grid differential protection method and system
  • A power grid differential protection method and system
  • A power grid differential protection method and system

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0063] The purpose of the present invention is to provide a power grid differential protection method and system, which has the characteristics of simple implementation and high accuracy of fault judgment.

[0064] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0065...

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Abstract

The invention discloses a power grid differential protection method and system. The method comprises the steps that the sampling time of a head end differential protection device and a tail end differential protection device is synchronized; the head end differential protection device and the tail end differential protection device collect the current amplitude and the power direction of a governed zone line at a mounting position at a certain time interval from the sampling time; the collected current amplitude and power direction are sent to one another; the head end differential protectiondevice and the tail end differential protection device determine whether the governed zone line breaks down or not according to the current amplitude and the power direction collected by themselves and the current amplitude and power direction sent by the opposite ends. The power grid differential protection method and system have the advantages of being simple and convenient in achieving mode andhigh in fault judgment accuracy.

Description

technical field [0001] The invention relates to the field of power grid protection, in particular to a power grid differential protection method and system. Background technique [0002] With the continuous development of the national distribution network and the continuous improvement of distribution network automation, the reliability requirements for power supply are also getting higher and higher. The reliability of power supply is an important index to measure the quality of power supply and distribution. The index to measure the reliability of power supply and distribution is generally expressed by the percentage of the annual average power supply time in the whole year. For example, the annual time is 8760 hours, and the user The annual average power outage time is 87.6 hours, that is, the power outage time accounts for 1% of the whole year, and the reliability of power supply is 99%. [0003] All kinds of intelligent measurement, control and protection devices of di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 刘长生
Owner 广东科瑞德电气科技有限公司
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