Radiator thermal resistance, thyristor dissipated power test method

A special sealing device is made by the method of disposing the dust in the radiator. This kind of device only leaves the fan through hole. Go to the construction site and construction site to collect a large amount of floating ash, place the collected floating ash and fan in a special closed device, turn on the fan to let the floating ash fill the entire special closed device, and from time to time use a diffuser to distribute the fog outside the special device Water, pay attention to control the proper humidity in the special sealing device. After waiting for about a month, check the accumulation of dust on the thyristor radiator assembly in the special sealing device, so that the thyristor assembly and radiator fins have accumulated a thick layer of lime soil, and then install it back to the thyristor rectifier for subsequent tests. The dust accumulation of the thyristor assembly is related to the amount of dust in the special sealing device, the humidity control, and the time the fan is turned on. If the dust accumulation is not enough, the time to open the sealing device can be extended to increase the dust in the special sealing device.

Radiator thermal resistance, thyristor dissipated power test method Excitation regulator is set to manual open-loop control (fixed control angle operation mode), through the thyristor high current test, after the temperature of the thyristor element is stabilized, measure the temperature of the thyristor shell and the wind speed below the thyristor radiator The temperature at the entrance, calculate the power dissipation of the thyristor, and calculate the thermal resistance of the thyristor radiator. Schematic diagram of the thyristor high current test. The submodule AVR represents the excitation regulator, the submodule FLZ represents the thyristor rectifier, the submodule TYQ represents the voltage regulator, the submodule BYQ represents the isolation transformer, and the submodule L1 is a large inductance component (simulated power generation) Machine rotor), factory power AC380V to the sub-module thyristor through the switch QS1, power generation control technology and equipment. Analysis of the effect of dust accumulation in the excitation system on the heat dissipation of the thyristor rectifier device. The rectifier device FLZ provides power supply. The factory power AC380V provides a synchronization signal to the excitation regulator AVR via the voltage regulator TYQ. U closes the load switch QS2, and the thyristor turns on the load. Large inductance L1 , A trigger pulse signal is provided through the excitation regulator AVR to control the thyristor rectifier to output a large current.