GROUND DETECTORS
GROUND DETECTORS DC Ground detectors are the devices that are used to detect/indicate the ground fault for ungrounded DC systems. When …
Electrical Technology
TRANSFORMER EXTERNAL FAULTS
TRANSFORMER EXTERNAL FAULTS External faults are those faults or hazards that occur outside the transformer. These hazards present stresses on …
SWITCHGEAR
SWITCHGEAR The apparatus used for switching, controlling, and protecting the electrical circuits and equipment is known as switchgear. The switchgear …
GENERATOR OVERHEATING PROTECTION
GENERATOR OVERHEATING PROTECTION Overheating of a synchronous generator may occur due to one of the following causes: 1. Overload2. Failure …
BOOSTER TRANSFORMER
BOOSTER TRANSFORMER Sometimes it is desired to control the voltage of a transmission line at a point far away from …
AUTO TRANSFORMER TAP CHANGING
AUTO TRANSFORMER TAP CHANGING The figure shows diagrammatically auto-transformer tap changing. Here, a mid-tapped auto-transformer or reactor is used. One …
TAP CHANGING TRANSFORMERS
TAP CHANGING TRANSFORMERS The excitation control method is satisfactory only for relatively short lines. However, it is not suitable for …
Excitation Control in Power Systems
Excitation Control in Power Systems When the load on the supply system changes, the terminal voltage of the alternator also …
BROWN BOVERI REGULATOR
BROWN BOVERI REGULATOR In this type of regulator, the exciter field rheostat is varied continuously or in small steps instead …
SUBSYNCHRONOUS RESONANCE
SUBSYNCHRONOUS RESONANCE Subsynchronous resonance is a condition that can exist in a power system where the network has natural frequencies …
