How to establish the main parameters for selecting dual power conversion switches

Establishing the main parameters for selecting dual power conversion switches is a prerequisite for selecting them appropriately. According to the specifications for dual power conversion switches, in order to effectively select dual power conversion switches, it is necessary to establish: rated operating standard voltage Ue, rated operating current Ia, frequency, number of phases, rated limited short-circuit capacity, conversion standard, application type, conversion time, etc.

1. Rated operating standard voltage, frequency, current, and phase number: This main parameter is considered the most basic requirement for dual power conversion switches to be "electrical conductors". Dual power conversion switches must consider the operating voltage, frequency, current, and phase number requirements of the city. General mechanical and electrical engineers are already very familiar with it.

Note: The working voltage, frequency, and constant are usually determined by the relative main parameters of the geographical location of the dual power switch. The rated voltage shall be a dual power conversion switch for fire pumps in accordance with the standard IEC62091 Fixed Fire Pump Controllers. The rated voltage shall not be less than 115% of the rated voltage of the motor. From a safety perspective, it is recommended to uniformly select a rated voltage of 125% of the load current for dual power conversion switches.

2. Switching standard: The destination of the dual power switching switch is that, under the "special" standard, the dual power switching switch must be fully automatic and reliable. This "special condition" is the conversion standard or conversion prerequisite for dual power conversion switches. The main factors to consider when choosing a dual power conversion switch.

3. If the universal power supply is not faulty, the dual power switch cannot be switched. That is a difficult problem that many customers (even manufacturers) overlook. The dual power switch control board must be able to recognize instantaneous fluctuations in various working voltages, including short-term overvoltage that cannot be powered. For example, the simulated power switch switching in the distribution room of the substation belongs to the shutdown of all normal power sources. The dual power switch cannot be considered as a power failure during the conversion, and the dual power switch must be able to determine the shutdown of these "all normal" power sources. According to EMC experiments, the dual power switch control board cannot function properly under external interference signals.

4. Switching is required in case of power failure. However, due to the many types of power failures (more than 10), it is necessary to set up the required switching for these failures. Due to the diversity of user needs, ordinary dealers have proposed dashboards with multiple functions, therefore, conversion standards must be determined based on load regulations for power quality. Otherwise, due to the chaotic market demand for dual power conversion switches and the fact that community owners have almost no knowledge of dual power conversion switches, the products ultimately used can generally only be converted when they completely exceed a standard, and other power failures (including interruptions and excessive work) occur.