A. impedance B. Reactance C. Either of the above D. None of the above Answer: D. None of the above Explanation: Reactance relay is suitable for the protection of a short transmission line because its operation is independen…
A guard wire or earth wire is the topmost conductor in high-voltage transmission lines. It is used mainly to protect lines from lightning. If in case lightning struck, then it carries the excessive current inrush to ground.…
Bundled Conductors are used: It reduces the reactance of the electric transmission line It also reduces corona loss, which improves the transmission efficiency as loss due to corona effet is countered (Corona effect can be observ…
The core type is used for high-voltage applications like autotransformers and power transformers. Shell type is used for low-voltage applications like transformers in an electronic circuit. Cooling is better in core type, b…
A pin insulator is a device that isolates a wire from a physical support such as a pin (a wooden or metal dowel of about 3 cm diameter with screw threads) on a telegraph or utility pole. It is a formed, single layer shape …
Basically, saying that the 3-phase supply is not a replicate of 3 times the single-phase supply. The 1-phase supply is between 1 line- and neutral. The 3-phase supply we obtain is not like measured between 3 lines-Neutral (…
First, we will see two results: 1) For a particular line voltage, the voltage across phase (windings) of star-connected windings will be 1/√3 (~57.8%) times the line voltage, and the voltage across phase (windings) in delta-conne…
What is the difference between a star and a delta connection? Star Connected System: Star connection is used where we require a Neutral terminal to obtain Phase voltage. in a star-connected system VL=√3Vph,mean Phase voltage is …
A commutator consists of a set of copper segments that are insulated from each other. The number of segments is equal to the number of armature coils. Each segment is connected to an armature coil and the commutator is keye…
Delta -Star Connection: Star-connected winding or load: (1) Line current is the same as phase current. (2) Phase voltage is only 58% of line voltage. Therefore, star connection is advantageous in the case of generator or transfor…
What is an Ideal Transformer? A transformer with no core loss, an ohmic resistance & no leakage flux is called ideal transformer. The ideal transformer is free from all types of losses. The ideal transformer is also cal…
