Protection Switchgear 2 min read
Rate of rise of recovery voltage
It is the rate of increase of restriking voltage and is abbreviated by R.R.R.V. its unit is kV/m sec.Consider the…
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Protection Switchgear 1 min read
Restriking voltage and recovery voltage
It is the transient voltage that appears across the contacts at or near current zero during arcing period.If dielectric strength…
Protection Switchgear 8 min read
Formation of arc during circuit breaking
The phenomena of Arc During opening of current carrying contacts in a circuit breaker the medium in between opening contacts…
Transmission and distribution 2 min read
Long distance power transmission
The electric power generated in a power station situated in a remote place is transmitted to different regions for domestic…
Basics 3 min read
Block Diagram of an Electrical Drives
Drive: A combination of prime mover, transmission equipment and mechanical Working load is called a drive Electric drive: An Electric…
Protection Switchgear 2 min read
Protection of bus bars
The protection scheme for a power system should cover the whole system against all probable types of faults. Unrestricted forms…
Protection Switchgear 5 min read
Generator protection
· The range of size of generators extends from a few hundred KVA to more than 500MVA · Small and Medium sized…
Power System Operation and Control 2 min read
Current Transformers(CT)s and Potential Transformer(PT)
Current transformers are generally used to measure currents of high magnitude. These transformers step down the current to be measured,…
Protection Switchgear 3 min read
Under Frequency | Negative Sequence Relay
Under Frequency Relay Frequency based relays can either be under frequency relay or over frequency relay. The frequency relays are normally used in generator protection and…
Protection Switchgear 1 min read
Static relays
Advantages of static relays • Due to the amplification of energizing signals obtainable, the sources need only provide low power. Therefore…