Digital optical fiber differential protection method based on current state variables

A current state and differential protection technology, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problem of consistent transmission characteristics of current transformers and optical fiber differential of current transformer transmission characteristics Protection device misoperation and other problems, to achieve the effect of simple criteria

Active Publication Date: 2014-12-17
北京天能继保电力科技有限公司
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital optical fiber differential protection method based on current state variables
  • Digital optical fiber differential protection method based on current state variables
  • Digital optical fiber differential protection method based on current state variables

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a digital optical fiber differential protection method based on current state variables. The digital optical fiber differential protection method comprises determining a protection action by use of a split-phase differential criterion according to the current state variables on the two sides of a line. According to the digital optical fiber differential protection method, the differential protection action criterion requires the current state variables on the two sides for calculating differential current and braking current instead of synchronously sampled data on the two sides and does not require the consistence of the characteristics of transformers on the two sides; the digital optical fiber differential protection method based on the current state variables is suitable 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap