Electrical equipment earthing is for safety purpose. Equipment earthing can prevent workers from severe shock hazard. Live parts of Electrical equipment are always earthed in electrical system every where.
There are so many advantages of equipment earthing:-
(1) Equipment earthing can reduce electromagnetic interference
(2) For Protection and Fault detection purpose Equipment earthing is important. Every Electrical power plant, Substation, Company has Equipment provided with proper Earthing.
In Our home every appliances should be provided with earthing for safety point of view.
Definitions CSD (Controlled Switching Device): A device that is installed at the relay and control panel to overcome the transient behaviour of voltage and current during switching. This device synchronizes the switching of each pole of the circuit breaker according to the zero crossing of the corresponding phase. This device is also known as a phase synchronizing device, or PSD for short. Requirement When we switch off an online circuit breaker to disconnect an inductive load, we ideally want to interrupt the current of the system at the zero crossing of the current waveform. However, this is practically impossible to achieve. In a normal circuit breaker, the current interruption may occur near the zero crossing point, but not exactly at it. Since the load is inductive, this sudden interruption of current causes a high rate of change of current (di/dt), which results in a high transient voltage in the system. In low or medium voltage power systems, this transient voltage during circui...