Preventive detection method for performance of variable flow assembly of high-power thyristor
A thyristor and high-power technology, which is applied in the field of preventive detection of the performance of high-power thyristor converter components, can solve problems affecting the continuous production of online equipment and expanding losses
Inactive Publication Date: 2013-01-09
SHANGHAI BAOYE GRP CORP
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Problems solved by technology
In some more advanced equipment, some protection links are added, such as the current detection of the bridge arm. When the detection shows that a thyristor is not turned on, it will be ordered to stop. Using the above passive maintenance method will seriously affect the continuous operation of online equipment. production, thereby amplifying the losses suffered
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[0021] The present invention introduces the parameters of the thyristor holding current value through the dissection, testing and comparison test of a large number of thyristor converter components in the main transmission system with large capacity and multiple parallel connections. When the DC voltage is applied, the gate minimum trigger voltage and current that can trigger the thyristor to conduct are called the trigger voltage and current of the thyristor. In practical applications, the trigger voltage and current of the thyristor are provided by the pulse power amplifier module, and its trigger power is designed and cannot be adjusted on site. Under this condition, whether each thyristor component can meet the requirements of normal operation requires a parameter To judge, this is the holding current value. Latching current is defined as the minimum anode current required to keep the thyristor continuing to conduct after the trigger signal is removed immediately after the...
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The invention discloses a preventive detection method for performance of a variable flow assembly of a high-power thyristor. The method comprises the following steps: measuring resistance-capacitance element values of the assembly, and comparing the resistance-capacitance element values with a nominal value; measuring forward and reverse gate resistances of the thyristor to be consistent; measuring the resistance between an anode and a cathode of the thyristor to be infinite; measuring forward and reverse leakage current of which value is small than 5mA between the anode and the cathode of the thyristor; measuring a control current and a control voltage of a first control end of a pulse amplification module and a current of a power supply input end, which are 20mA, 5 to 7v and 680 to 750mA respectively; measuring a voltage value and a current value which are 2 to 3v and 1 to 10A respectively when the thyristor is switched on; measuring a minimum trigger voltage of a thyristor gate, which is 1 to 4v; measuring a latching current value of the thyristor, which is small than 1A; and measuring a holding current value which is no more than 25 percent of holding current after the thyristor is switched on. The method can master the performance characteristics of the variable flow assembly of the thyristor in real time, reduce the on-line fault rate of the variable flow assembly of thethyristor, and ensure the normal operation of equipment.
Description
technical field [0001] The invention relates to a preventive detection method for the performance of a high-power thyristor converter component applied to equipment electric energy conversion. Background technique [0002] With the continuous development of semiconductor technology, high-power power electronic devices are widely used in various industries. Especially in large-scale cold and hot-rolled steel equipment, a large number of thyristor converter components are used to realize the conversion of electric energy, so that the control function of the equipment can be realized conveniently and superiorly, and various functions of the equipment design can be achieved. However, with the increase of the operation time of the equipment, the components in the thyristor converter components are aging, especially the aging of the thyristor, and there is a certain degree of deterioration, which seriously affects the normal operation of the equipment. At present, there is no com...
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IPC IPC(8): G01R31/26G01R31/27
Inventor胡玉纯李磊陈文胜
OwnerSHANGHAI BAOYE GRP CORP