Reliability detection method of direct-current transmission converter valve trigger monitoring unit

Abstract

The invention relates to a reliability detection method of a direct-current transmission converter valve trigger monitoring unit. The method comprises the following steps of (1) examining TTM board card appearances and determining that TTM board cards are not damaged; (2) carrying out TTM board card electrical performance detection; (3) carrying out environment stress detection on a batch of the TTM board cards and carrying out failure screening; (4) finally detecting the TTM board card electrical performance so that an unaccepted product is detected. Through the method, the TTM circuit board cards having a failure risk are screened. After a reliability detection method in the invention is used, a failure rate of the TTM board cards in engineering application is lower than 0.025% and reliability is high. An unattended screening process of the batch of the TTM is realized so that manpower is saved, phenomena of man-made false detection and leak detection are eliminated. A damping loop unit in the invention is used to carry out low voltage power supply for the TTM board cards. Based on an acquired complete external characteristic of the TTM board cards, a risk for operation personnel to suffer from electric shock can be greatly reduced.

Description

technical field [0001] The invention relates to a monitoring method in the field of high-voltage direct current transmission, in particular to a reliability detection method for a monitoring unit triggered by a converter valve of direct current transmission. Background technique [0002] The converter valve is the core equipment of the DC transmission system. The trigger monitoring unit (hereinafter referred to as TTM) is responsible for the triggering and monitoring of the thyristor level of the converter valve. The stability and reliability of its work are directly related to the normal operation of the DC transmission system. Each UHV DC transmission project requires a large number of TTM boards. Taking the ±800kV DC transmission project as an example, 8 sets of 12-pulse converters connected in series with each single-valve 72-stage thyristor are required, and each converter requires 864 TTM boards. There are as many as thousands of electronic components on each TTM circu...

AI Technical Summary

Problems solved by technology

Each UHV DC transmission project requires a large number of TTM boards. Taking the ±800kV DC transmission project as an example, 8 sets of 12-pulse converters connected in series with each single-valve 72-stage thyristor are required, and each set of converters requires 864 TTM boards. There are as many as thousands of electronic components on each TTM circuit board. The total number of TTM electronic components in the entire project exceeds 10 million. Any damage to any electronic component on the TTM board will directly lead to the failure of the board. The TTM board After the card fails, a thyristor-level failure will occur. In actual engineering, the number of thyristor-level redundancy for each single valve is less than 4 levels. For DC transmission projects, thyristor-level failure is an important event of equipment damage. Once the number of redundancy is exceeded, It must be tripped and powered off for maintenance, and the economic loss is calculated in billions of yuan

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