Why Does A Voltage Stabilizer Need Higher Power When The Voltage Is Low

Reason Analysis

Suppose we have an oil-immersed voltage stabilizer with a power of 1000 KVA. Under the normal voltage of 380 volts, the maximum current it can pass is 1500 amps. However, when the voltage drops to 300 volts, if the power of the stabilizer remains unchanged, according to the formula, the current in the stabilizer circuit will become 1000000 ÷ 300 ÷ 1.732, approximately 1924.5 amps (the calculation in the original content was incorrect and has been corrected). This current value exceeds the original peak current of the stabilizer.

Consequences

When the current exceeds the peak value of the stabilizer, it will cause the stabilizer to generate a large amount of heat in a short time. If this situation persists for a long time, it may burn out the stabilizer and even lead to more serious safety accidents, affecting the normal operation of the entire power system.

Solution

To avoid the above problems, when configuring the voltage stabilizer, it is recommended that you appropriately reserve a larger power under full - load conditions. This can ensure that the stabilizer can still operate safely and stably when the voltage is low, providing reliable power protection for your equipment.