Principle :  The incipient faults in transformer tank below oil level actuate Buchholz relay so as to give an alarm....

Explosion vent: In order to guard against the possibility of a sudden high pressure caused by a breakdown or a...

Buchholz relay:  The buchholz (as/liquid operated) relay is connected in the pipework between the transformer tank and the conservator. If...

Winding Temperature indicator (WTI) : 1.The thermometer bulb is located in a pocket near the winding The bulb is surrounded...

1.An oil thermometer which is common with oil-filled transformers can be considered as a partially effective device.  2.When equipped with...

Temperature indicators : There are two types of temperature indicator OTI and WTI. 1)The Oil Temperature Indicator (OTI) and Winding...

Reactive power: 1) Almost all is power transported or consumed in alternating current (AC) networks. AC systems supply or consume...

Rating protection devices: Short circuit can produce cough thermal and electromagnetic forces to destroy any protective device. When selecting a...

Short circuit protection devices: Protection against temperature is termed "Short circuit poster Short circuit are caused by equipment overloads, by...

NEMA contactors for low-voltage motors (less than 1000 volts) are rated according to NEMA size, which gives a maximum continuous...