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In industries such as power plants and industrial manufacturing, in order to ensure the discontinuity and safety of consumption, UPS power supply systems for industrial frequency machines are installed on important sites. In order to ensure that the UPS power supply of the power frequency machine can provide a reliable power supply to the load equipment in case of faults or maintenance, it is necessary to configure a bypass cabinet for the UPS power supply of the power frequency machine.
When the UPS power supply of the industrial frequency machine operates normally, it requires three input power sources: main mains power, bypass standby mains power, and battery. The normal power supply route is: main mains power, charger, inverter, static switch, and load. When the main mains power is connected, the power supply channels are: battery, inverter, static switch, and load. When the battery is discharged or the inverter malfunctions, the power supply channels are: backup mains power, static switch, and load. If the backup mains voltage exceeds the specification, the static switch of the power frequency machine UPS power supply will reject the backup mains power supply to the load, which will inevitably form a power supply infix. Therefore, the quality of standby mains power is crucial for the power supply system of the industrial frequency machine UPS, and the bypass automatic voltage stabilizing equipment (referred to as the bypass cabinet) of the industrial frequency machine UPS power supply series is set up specifically for the demand of standby mains power from the industrial frequency machine UPS power supply.
The external dimensions, colors, and construction of the electronic bypass cabinet are compatible with GUTOR's various series of UPS power supplies, and its technical performance indicators meet the requirements of UPS normal operation. It has maintenance functions such as input isolation, output automatic voltage regulation, bypass maintenance, phase loss, overload, overvoltage, short circuit, and delayed output. When the UPS power supply of the industrial frequency machine malfunctions or terminates power supply due to load overload, the UPS automatically switches to bypass power supply. When the instability of the urban power grid leads to voltage sag or high voltage, voltage surge, reduced amplitude oscillation, power interference, power surge, power peak, three-phase power imbalance, AC transient and harmonic distortion, etc., the bypass cabinet can also play a role in stabilizing voltage, isolating and resisting impact, preventing damage to equipment.
The electronic bypass cabinet mainly consists of four parts: isolation transformer, output voltage compensation transformer, output voltage automatic compensation regulator, and automatic voltage stabilization control unit. The isolation transformer completely isolates the system output from the power grid, with a rated primary/secondary voltage of 380/220VAC; The automatic adjustment installation of output voltage consists of an automatic voltage stabilizing control circuit, a voltage regulating motor, a compensating voltage regulator, and a compensating transformer. This installation has high adjustment flexibility, strong anti-interference ability, stable working performance, and is equipped with an output voltage precision adjustment circuit.
As an indispensable auxiliary system for industrial frequency UPS power supply, the bypass cabinet is equipped with a conversion control switch for both "automatic" and "manual" working modes. When the control switch switches to "automatic" working mode, the equipment is in an automatic voltage stabilization state; When the control switch is switched to the "manual" working mode, the "boost" and "decrease" buttons can be used to stop the "boost" and "decrease" operations of the output voltage, completing the purpose of manually adjusting the output voltage and ensuring the stability of the output power quality.
Compared with other types of voltage stabilizers, bypass cabinets have the characteristics of large capacity, high efficiency, no waveform distortion, stable voltage regulation, strong anti-interference ability, universal load adaptability, ability to accept instantaneous overload, convenient use, cumbersome maintenance, and reliable operation. They can be widely used as maintenance equipment for industrial discontinuous power supply front-end in nuclear power plants, petroleum and natural gas, petrochemical, power generation, chemical and other industries, and can also be used in bypass power supply systems for large equipment.
In summary, in order to better ensure stable voltage supply to the load, the UPS power supply system of the power frequency machine needs to be equipped with a bypass cabinet. The electronic bypass cabinet has stable performance and high safety, which can meet the requirements of continuous operation of equipment, thereby improving the reliability of equipment operation and having strong market competitiveness.
