Selection of Electrical Switches for Auxiliary Power System of Prefabricated Photovoltaic Step-up Substation
This article introduces the typical design scheme of photovoltaic step-up substation and the selection principle of theswitch used in substation's auxiliary power system.By studying the technical parameters of low-voltage circuit breakers,the characteristics that the short-circuit breaking capacity of the circuit breaker decreases rapidly with the increase of the working voltage are analyzed.The short-circuit current is calculated by using the power analysis and calculation software ETAP to determine the short-circuit level of the system.The solution of selection and parameter determination of switch for auxiliary power system of prefabricated photovoltaic step-up substation is put forward.
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