Current interrupt protection test method for direct current converter valve thyristor

A DC converter valve and current intermittent technology, which is applied in circuit breaker testing, single semiconductor device testing, etc., can solve the problems of high voltage, inability to test single-stage thyristor, limited number of DC intermittent, etc., and achieves easy operation. , the effect of simple and easy test circuit

Active Publication Date: 2013-12-18
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test method mentioned in the patent application is to test the valve module of the DC converter. Since a high-voltage test device is required for adjustment, the generated voltage is relatively high, and the single-stage thyristor cannot be tested. The number of DC intermittents is also limited

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  • Current interrupt protection test method for direct current converter valve thyristor
  • Current interrupt protection test method for direct current converter valve thyristor

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Embodiment Construction

[0018] This technical scheme designs a thyristor current intermittent test circuit, and its principle is as attached figure 1 shown. The test circuit is composed of AC power supply, isolation transformer, IGBT module and test platform. The AC power supply connects the AC voltage to the anode and cathode of the thyristor test product through a voltage regulator and isolation transformer. The first IGBT1 and the second IGBT2 in the control circuit of the test platform are turned on and off, thereby controlling the voltage waveform applied to the thyristor. After the test platform sends a trigger code pulse to TE at the same time, it is decoded and generates a pulse that can trigger the thyristor. The test can be completed through timing control.

[0019] The timing control and thyristor voltage waveform designed by the invention are as attached figure 2 As shown in the figure, the voltage and current waveforms under the control timing of the figure, when the voltage at both e...

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Abstract

The invention relates to the field of power system devices, in particular to a novel current interrupt protection test method for a direct current converter valve thyristor. The current interrupt protection means that: when a thyristor is positioned in a forward conduction region, if a current is interrupted, the thyristor is shut off due to the zero pass of the current; when bearing the forward voltage, the shut thyristor cannot be turned on instantly because thyristor electronic equipment (TE) does not send trigger pulse again, and if the voltages on the two ends of the thyristor are over high, the thyristor is even damaged; therefore, the general direct current converter valve thyristor electronic equipment (TE) is required to have the function of re-triggering the thyristor after the current interrupt. The test aims to verify the current interrupt protection function of the TE. In the invention, the controllable switching capability of an insulated gate bipolar transistor (IGBT) is used, and an interrupting current is generated by a circuit and applied to the thyristor electrode for carrying out the test.

Description

technical field [0001] The invention relates to the field of electric power system devices, in particular to a new test method for intermittent current protection of thyristors of DC converter valves. Background technique [0002] The intermittent current protection test is an important part of the routine test of the converter valve. Since the thyristor is the most basic and important component of the converter valve, its reliable operation is the prerequisite for ensuring the normal and reliable operation of the converter, so it must be guaranteed The converter valve can work reliably under various operating conditions. Current discontinuity means that when the thyristor is in the forward conduction range, if the current discontinuity occurs, the thyristor will be shut off due to the current zero crossing. Since the thyristor does not send the trigger pulse again, it cannot be turned on immediately when it is subjected to a forward voltage. If the voltage across the thyris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26G01R31/327
Inventor 查鲲鹏陈龙龙孙倩
Owner CHINA ELECTRIC POWER RES INST
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