Testing method and device of thyristor switching stress

A technology of stress testing and thyristor, which is applied in the direction of testing dielectric strength, etc., can solve the problems of lack of single thyristor turn-on stress test assessment, damage to the tested valve and test device, and large economic losses, so as to improve safety and economy. The effect of low device cost and comprehensive functions

Active Publication Date: 2013-04-17
CHINA EPRI ELECTRIC POWER ENG CO LTD +2
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AI Technical Summary

Problems solved by technology

According to the IEC60700 standard, the turn-on stress of the thyristor is an important assessment index for the type test and routine test of the converter valve, but it is based on the overall structure of the valve module, and the test assessment of the turn-on stress of a single thyristor is lacking.
And if a thyristor breaks down or burns out during the test, it may damage the entire tested valve and test device, resulting in large economic losses and even potential safety hazards.

Method used

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  • Testing method and device of thyristor switching stress
  • Testing method and device of thyristor switching stress
  • Testing method and device of thyristor switching stress

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] Such as Figure 1-Figure 3 , provide a thyristor turn-on stress testing method, the method includes the following steps:

[0031] Step 1: Heat the test thyristor to the equivalent junction temperature under the operating condition of the converter valve;

[0032] Step 2: Charge the adjustable capacitor C;

[0033] Step 3: Trigger the thyristor of the test product, so that the adjustable capacitor C releases energy, and complete the one-time turn-on stress test of the thyristor of the test product;

[0034] Step 4: Repeat Step 2 and Step 3 for the next test cycle until the end of the test.

[0035] In the step 1, the switch Kr is closed, the DC voltage source E is controlled, and the thyristor of the test sample is heated to the equivalent junction temperature under the operating condition of the converter valve through the resistance r.

[0036] In...

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Abstract

The invention provides a testing method and device of thyristor switching stress, which has comprehensive functions and meets the testing requirements of the thyristor switching stress under various working conditions of a converter valve. Moreover, the topological structure of a circuit is simple and practical, the required equipment capacity is small, and the device cost is low. The testing for a single thyristor is directly carried out by the method, the capability of each thyristor inside for enduring switching voltage and current can be checked before the converter valve is assembled, and therefore the producing and manufacturing safety and economical property of the converter valve are improved. In addition, the testing strength of electrothermal stress can be improved by adjusting testing parameters by the method, and therefore the limiting tolerance value of the thyristor switching stress can be known through continuous tests, and bases are provided for the optimal design of a converter-valve system.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a thyristor turn-on stress test method and device. Background technique [0002] The converter valve is the core equipment of the DC transmission system. Since the 1970s, the converter valve with the thyristor as the core switching device has gradually been widely used. When the converter valve is turned on, a large surge current will flow into its internal thyristor, and excessive current and di / dt may cause damage to the thyristor. Therefore, for the converter valve system that has been designed, it is of great significance to ensure the long-term stable operation of the converter valve to verify whether the thyristor can withstand the opening current stress by means of tests. According to the IEC60700 standard, the turn-on stress of the thyristor is an important assessment index for the type test and routine test of the converter valve, but it is based o...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 高冲雷小舟陈争光
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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