Protection Switchgear 6 min read
Steady State Stability:
Equilibrium speed of motor-load system can be obtained when motor torque equals the load torque. Electric drive system will operate…
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Dynamics of Motor Load System
A motor generally drives a load (Machines) through some transmission system. While motor always rotates, the load may rotate or…
Protection Switchgear 3 min read
Testing of circuit breakers
Primary injection test For primary injection testing, high current is injected on the primary side of the current transformer. The…
Protection Switchgear 3 min read
vacuum circuit breakers
In this breaker, vacuum is being used as the arc quenching medium. Vacuum offers highest insulating strength, it has far…
Protection Switchgear 5 min read
SF6 circuit breaker
At this point we are aware that the medium in which arc extinction of the circuit breaker takes place greatly…
Protection Switchgear 3 min read
Oil circuit breakers
Types Of Oil Circuit Breakers Oil circuit breakers can be classified into following types: 1) Bulk oil circuit breakers which…
Protection Switchgear 6 min read
Air blast circuit breaker
This type of circuit breakers, is those kind of circuit breaker which operates in air at atmospheric pressure. After development…
Protection Switchgear 7 min read
Rating of Circuit Breaker
The rating of a circuit breaker includes, 1) Rated short circuit breaking current. 2) Rated short circuit making current. 3) Rated operating sequence of circuit…
Protection Switchgear 3 min read
current chopping
Current chopping is a term that came to our vocabulary with the advent of vacuum switching which was commercially started…
Protection Switchgear 3 min read
Resistance switching
To reduce the restriking voltage, RRRV and severity of the transient oscillations, a resistance is connected across the contacts of…
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…
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…