Direct-current transmission line protection method and system based on pure current characteristics

A technology of DC transmission lines and current characteristics, applied in the direction of measuring current/voltage, automatic disconnection of emergency protection devices, circuit devices, etc., can solve problems such as poor transition resistance capability, operational performance vulnerable to lightning strikes, abnormal large numbers, etc.

Active Publication Date: 2020-01-03
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] In order to solve the technical problems of traveling wave protection and undervoltage differential protection in the current technology that are poorly able to withstand transition resistance, the action performance is easily affected by lightning strikes, abnormal large numbers, and noise interference, and the longitudinal differential protection has a long delay in action, this paper The invention provides a DC transmission line protection method based on pure current characteristics, the method comprising:

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  • Direct-current transmission line protection method and system based on pure current characteristics
  • Direct-current transmission line protection method and system based on pure current characteristics
  • Direct-current transmission line protection method and system based on pure current characteristics

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Embodiment Construction

[0157] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not limiting of the present invention. In the figures, the same units / elements are given the same reference numerals.

[0158] Unless otherwise stated, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that the terms defined by commonly used dictionaries should be understood as having consistent meanings in the context of their related fields, and should not be understood as idealiz...

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Abstract

The invention provides a direct-current transmission line protection method and system based on pure current characteristics. The method is characterized in that a current difference value and a current break variable of a line are determined by collecting the current of a direct-current transmission line, and whether a preset protection criterion is established or not is determined according to the current difference value and the current break variable of the line, so that whether the direct-current protection action is outputted or not is determined. The method is advantaged in that the action speed of metallic fault protection can be further increased, the action speed of high-resistance fault protection is greatly improved, protection is reliable and does not act when lightning strokeor abnormal large number occurs, the protection of a non-fault pole line is reliable and does not malfunction under a single-pole grounding fault working condition, and protection performance of thedirect-current transmission line is comprehensively improved.

Description

technical field [0001] The present invention relates to the field of relay protection of power systems, and more specifically, to a method and system for protecting direct current transmission lines based on pure current characteristics. Background technique [0002] Compared with the traditional AC transmission system, the HVDC transmission system has the advantages of large transmission capacity, long transmission distance, and low loss. It has been widely used in long-distance power transmission, large-area grid interconnection, and underground cable transmission. High-voltage direct current transmission lines shoulder the heavy responsibility of power transmission in the energy production area and load center time period. The transmission distance is long, the operating conditions are harsh, and the failure rate is higher than other parts of the direct current system, accounting for about 50% of the direct current system failures. Therefore, high-performance HVDC transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R19/165
CPCH02H7/268G01R19/16538H02H3/286H02H1/0007H02H1/0092
Inventor 周泽昕柳焕章吕鹏飞曹虹王兴国阮思烨杜丁香李勇杨国生金明亮
Owner CHINA ELECTRIC POWER RES INST
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