Electrical Engineering Articles

Generators produce two types of power. Active power (kW) does real work like running lights and motors. Reactive power (kVAR) makes the magnetic field needed for voltage. Both are important. To keep a generator safe, we run tests. The heat run test checks cooling. We run the generator at full load for hours and measure temperatures. If nothing gets too hot, the cooling works fine. The high voltage test checks insulation strength. We apply extra-high voltage for one minute. If the insulation holds, it is good. If it fails, we fix it. The insulation resistance test is a simple daily check. We use a megger to measure resistance between wires and ground. High resistance means clean, dry insulation. Low resistance means moisture or dirt – time to clean.