Calculation of short-circuit current of ultra-high power rectifier

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Calculation of short-circuit current of ultra-high power rectifier [Copy link]

Abstract: The calculation of short-circuit current of ultra-high power rectifier is essential for its protection design. This paper introduces the calculation method of short-circuit current of ultra-high power rectifier through a practical electrochemical engineering project. The calculated value is very close to the measured value, which proves the correctness of the calculation method.

Keywords: ultra-high power rectifier; short circuit; short circuit current calculation

As we all know, aluminum smelters are energy-intensive. In order to reduce the unit production cost of aluminum smelters, facilitate centralized management of environmental pollution and harmonic pollution, and improve economic and social benefits, the annual design output of aluminum smelters is getting higher and higher (such as 100kt or even higher). Therefore, the power of the rectifier power supply is also getting higher and higher. In order to reduce the loss of the power transmission system and ensure the stability of the AC power supply system, for single-series aluminum smelters with an annual output of 100kt or more, the grid side of the rectifier power supply equipment mostly uses AC220kV high voltage power supply. As a result, the short-circuit capacity of the power supply system of the rectifier power supply is also getting larger and larger.

For ultra-high power rectifier equipment, the short-circuit current value on the valve side is closely related to the surge current (or I2t) that the rectifier device can withstand and the ultimate breaking capacity of the fast fuse. Whether the protection coordination between the three is reasonable is directly related to whether ^the rectifier power supply equipment can operate safely and reliably .

^{The surge current (or I2t} ) of the rectifier and the I2t of the fast fuse ^can be found in their product manuals, but the short-circuit current value of the rectifier power system cannot be found. The short-circuit current value of the rectifier power system depends on the sum of the short-circuit impedance of the rectifier system and the impedance of the power system, and the latter is related to the operating conditions and short-circuit capacity of the power system. Therefore, in order to reasonably select the relevant parameters of the rectifier and fast fuse and make them meet the requirements of system protection, the maximum short-circuit current value of the rectifier equipment must be calculated.

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