Distance Protection Impedance Relay: Distance Protection Impedance Relay - It has already been pointed out that the impedance is directly proportional to the length of the line, and hence an…
Scheme of Distance Protection: In developing an overall Scheme of Distance Protection, it is necessary to provide a number of relays to obtain the required discrimination. Modern practice is to…
Principle of Distance Relaying: The Principle of Distance Relaying is governed by the ratio of voltage to current at the relay location and the operating time of the relay automatically…
Distance Relays Types and their Applications: In applying relays to a transmission system it is necessary to state the relay characteristic in the same terms that the system conditions are…
Important Questions of Circuit Breakers: 1. What is a circuit breaker ? Describe its operating principle. 2. Discuss the arc phenomenon in a circuit breaker. 3. Explain the various methods…
Important Questions of Performance of Transmission Lines : 1. What is the purpose of an overhead transmission line ? How are these lines classified ? 2. Discuss the terms voltage…
Miscellaneous Devices Articles: Voltage Variable Capacitors: VVC Operation – Voltage Variable Capacitors diodes (VVCs) are also known as variÂcaps, varactors, and as tuning diodes. Basically, a Voltage Variable Capacitors is…
Optoelectronic Devices Articles: Light Units: The total light energy output, or luminous flux (Φs), from a source can be measured in milliwatts (mW) or in lumens (1m), where 1 Im…