Conditions for buying a voltage stabilizer
Because the designers of electrical appliances have taken into account the power supply fluctuation factors during use and designed a safety factor to ensure normal operation within a certain voltage fluctuation range, if the power supply voltage in the area where you live is often kept within the voltage range applicable to household appliances and there are no frequent power outages, there is no need to buy a voltage stabilizer.
Issues to pay attention to when purchasing a voltage stabilizer
- When the voltage stabilizer is used for inductive loads, since the inductive load has a large instantaneous starting current, which is generally about 3-5 times the rated current and often exceeds 9 times the operating current (such as refrigerators, air conditioners, washing machines, electric fans, large air conditioners, printing presses, air compressors, elevators, water pumps, etc. are all inductive loads), so all voltage stabilizers equipped with inductive loads such as motors and compressors must consider their power reserves. If there is a margin, sufficient margin must be reserved to avoid the impact current generated when the load is turned on. The voltage stabilizer causes immediate damage to the voltage stabilizer. If the whole factory uses a voltage stabilizer, when starting the machine, it should be avoided that a high-power inductive load starts at the same time. Therefore, when purchasing a voltage stabilizer, there should be 1.5 times the reserved capacity, and the reserved capacity for a single machine should be 3 times.
- Pay attention to the voltage value of the mains power supply, whether it exceeds the input voltage range specified by the purchased voltage stabilizer, and whether the three-phase voltage differs by more than 10V.
- Before purchasing the machine, it is necessary to consider future business expansion, whether additional equipment is needed, and whether the voltage stabilizer needs to reserve expansion capacity.
- Whether it is a single machine or a whole factory, the selected voltage stabilizer should reserve a certain reserved capacity to avoid a 100% load rate of the voltage stabilizer. The load rate of the voltage stabilizer is generally 90%, which is more appropriate.
- The appearance structure of the automatic voltage regulator includes desktop, wall-mounted, dual-purpose desktop and wall, and floor-standing types. Different styles should be selected according to the installation location, main purpose, and installation capacity.
- When buying a voltage stabilizer, it is recommended that you choose a voltage stabilizer with at least three times the actual power, because the voltage stabilizer must overcome the surge impact of the mains and the starting impact of the inductive load (such as refrigerators, air conditioners, motors and electric motors) in actual work.
- When purchasing, when selecting the output power of the voltage stabilizer according to the rated power of the electrical equipment, the startup surge current, the inductive and capacitive load conditions, etc., sufficient margin should be left, and the margin should be larger when used for impact loads.
When buying a voltage stabilizer, the method of selecting the power used
The output power marked on the voltage stabilizer is the maximum power. The nominal power of household appliances refers to the active power, and the inductive loads such as refrigerators, air conditioners, and water pumps have a large current at the moment of startup, so refrigerators, air conditioners, and water pumps are rated at power x (3 to 5 times).
- For example: 3-horsepower Midea air conditioner (220V power). 1 horsepower equals 0.75 kilowatts * 3 horses = 2.25 kilowatts * 3 times the inductive load starting current = 6.75 kilowatts. The above voltage stabilizers are applicable. (Midea maintenance and installation technicians recommend the use of 8KVA voltage stabilizers)
Based on the power calculation method used by professional water and electricity installation technicians and factory professional electricians, engineers, and voltage stabilizers: General industrial equipment is rated at least 2 times the rated power. When used on equipment with motor operation, high current starting devices, and impact loads, a voltage stabilizer with a capacity of more than 3 times should be selected to avoid excessive starting current, power supply line voltage reduction, and inability to work normally.
- For example: a steam pump machine (380V electrical equipment) in a factory. The power of a motor is 7.5 kilowatts. However, when it starts to run and work, the surge current exceeds 3 times the motor power, so a voltage stabilizer with a power greater than 3 times must be selected.
When the output voltage of the 0.5-3K voltage stabilizer is selected to be 110V, the input capacity cannot exceed 40% of the rated capacity. When the output end needs to use 110V and 220V at the same time, the output capacity should be 50% of the rated capacity to avoid overload.
The power of the voltage stabilizer can be calculated based on the following factors: the rated power of the equipment + the current + the power loss of the voltage stabilizer due to low input voltage + the use margin, etc.
