Signal distance protection method of direct current power transmission line

A technology for DC transmission lines and distance protection, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as large amount of calculation and complex algorithm, and achieve the effect of overcoming poor reliability and simple method.

Inactive Publication Date: 2011-11-09
SHANGHAI JIAO TONG UNIV
View PDF2 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this existing technology needs to calculate the mold voltage and mold current on the protection line, the algorithm is complicated and the calculation amount is large

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
  • Signal distance protection method of direct current power transmission line
  • Signal distance protection method of direct current power transmission line
  • Signal distance protection method of direct current power transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] Such as figure 1 As shown, the system structure diagram of the bipolar HVDC transmission line. The protection and measuring devices at both ends of the DC line monitor the current and voltage at both ends of the line in real time, and exchange data information through inter-station communication.

[0030] Such as figure 2 As shown, the schematic diagram of the signal distance protection configuration. When the signal distance protection starting element meets the conditions, the signal distance main protection starts, if the signal distance degree Δ zn (τ) reaches the protection setting value Δ znset3 , the protection will act reliably; otherwise, the protection will not act reliably.

[0031] Such as image 3 As shown, the flow chart of the method for signal distance protection is realized. The protection measurement device installed at both ends of the DC line collects real-time data. After the signal distance protection is started, the DC protection device cal...

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 discloses a signal distance protection method of a direct current power transmission line. The fault type of the direct current power transmission line is determined by computing current signals of current transformers at two ends of the direct current power transmission line as discrete sample signals to obtain a distance degree Delta zn (tau) between the discrete sample signals. The signal distance protection method of the direct current power transmission line is applicable to the direct current power transmission line, is not influenced by distributed capacitance currents, overcomes the defects of the conventional high-voltage direct-current line differential protection, has high tolerance capacity of transition resistance, does not have special requirements on a sampling frequency, and is simple in operation, easy to implement, high in motion speed and high in reliability.

Description

technical field [0001] The invention relates to a method in the technical field of electric power systems, in particular to a signal distance protection method for direct current transmission lines. Background technique [0002] High-voltage direct current (HVDC) transmission occupies an important position in long-distance and high-power transmission because of its advantages such as large transmission power and good control performance. Developed countries in the world regard it as the main method for large-capacity, long-distance power transmission and asynchronous networking. means. In my country, since the completion of the Zhoushan DC transmission project in 1987, the number of DC transmission projects in my country has been increasing day by day. With the construction of a strong smart grid that "transmits power from west to east, mutual supply between north and south, and national networking", the next ten years will be the explosive period of my country's DC transmi...

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): H02H7/26
Inventor 郑晓冬邰能灵杨光亮丁浩寅涂歧毛俊
Owner SHANGHAI JIAO TONG UNIV
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