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A digital optical fiber differential protection method based on current state quantity

A current state and differential protection technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc. Protection device malfunction and other problems, to achieve the effect of simple criteria

Active Publication Date: 2017-09-22
北京天能继保电力科技有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] 2. The problem of consistent transmission characteristics of current transformers
When a fault occurs outside the protection zone, the inconsistency of the transmission characteristics of the current transformer will cause the optical fiber differential protection device to malfunction

Method used

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  • A digital optical fiber differential protection method based on current state quantity
  • A digital optical fiber differential protection method based on current state quantity
  • A digital optical fiber differential protection method based on current state quantity

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Embodiment Construction

[0041] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 as shown, figure 1 It is a flow chart of the method of the present invention. The present invention provides a digital optical fiber differential protection method based on current state quantities. The method uses phase-separated differential criteria to judge the protection action behavior according to the current state quantities on both sides of the line. Specifically include the following steps:

[0043] Step 1. Determine the secondary effective value and current direction of the current on one side of the line.

[0044] Step 2. Determine whether the system is a double-side power supply system or a single-side power supply system. When the system is a double-side power supply system, determine the current state quantity according to the method for determining the current state quantity of the double-s...

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Abstract

The invention provides a digital optical fiber differential protection method based on the current state quantity, which includes judging the protection action behavior by using the phase-separated differential criterion according to the current state quantity on both sides of the line. In the method of the present invention, the differential protection action criterion uses the state quantity of the current on both sides, does not use the synchronous sampling data on both sides to calculate the differential current and braking current, and does not require that the characteristics of the transformers on both sides are consistent; the method of the present invention is applicable For various conventional current transformers or electronic current transformers.

Description

technical field [0001] The invention relates to a method in the technical field of electric power system relay protection, in particular to a digital optical fiber differential protection method based on current state quantities. Background technique [0002] The principle of current differential protection is the most ideal relay protection principle. Optical fiber differential protection for transmission lines has become one of the mainstream configurations for power system line protection. At present, the digital optical fiber differential protection is to convert the current signal at both ends of the transmission line into a digital signal and transmit it to the opposite end through the optical fiber. The digital signal transmitted is the sampled value of the terminal current or the real and imaginary parts of the current phasor. The protection device receives the digital signal from the opposite end and then forms a differential protection with the digital signal at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/26
Inventor 柴静波李春久刘海波
Owner 北京天能继保电力科技有限公司
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