Method for protecting earth electrode line

Abstract

The invention relates to a method for protecting an earth electrode line. The method is characterized by comprising the steps as follows: a third current transformer (T3) and a fourth current transformer (T4) are added to the positions, from two groups of leads of the earth electrode line at an earth electrode tip to a frame respectively; and a third current (IDEE1) flowing through the third current transformer (T3) and a fourth current (IDEE2) flowing through the fourth current transformer (T4) are fed into an electrode protection device in a convertor station through earth electrode line cables respectively, and are logically compared with a first current (IDEL1) flowing through a first current transformer (T1) and a second current (IDEL2) flowing through a second current transformer (T1) at the outlet part of the earth electrode line in the convertor station. Experimental simulation proves that the overall operation safety and reliability of the convertor station can be improved by the earth electrode line added with differential protection; and meanwhile, the method is very helpful to improvement of the operation maintenance and management level of the earth electrode line and promotion of state overhaul work.

Description

Technical field [0001] The invention relates to a method for grounding electrode line protection. Background technique [0002] At present, the grounding electrode line protection of converter stations is usually equipped with grounding electrode line unbalance protection and grounding electrode line impedance monitoring. However, after long-term use, it has been found that the use of ground electrode line unbalance protection cannot achieve the protection of the full length of the line. The grounding electrode line impedance monitoring function realizes the detection of faults such as open circuit and grounding of the grounding electrode line by configuring transformers, blocking filters, and injection filters in the station and on the grounding electrode side. However, this function is often used in actual operation. False alarm occurs and reliability is low. Summary of the invention [0003] The object of the present invention is to provide a method for grounding electrode li...

AI Technical Summary

Problems solved by technology

However, after long-term use, it is found that the protection of the full length of the line cannot be achieved by using the ground electrode line unbalanced protection.

The ground electrode line impedance monitoring function, through the configuration of transformers, blocking filters and injection filters and other equipment in the station and on the ground electrode side, realizes the detection of faults such as open circuit and grounding of the ground electrode line, but in actual operation, this function often False alarms occur, low reliability

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