1). What is Flexible Bus?
Flexible buses are made up of flexible ACSR or all-aluminium alloy stranded conductors that are supported by strain insulators at each end.
2). What are different insulators employed in substations?
A number of insulators used in substations are:
- Pin insulators
- Post insulators
- Strain insulators.
- Suspension insulators
- Hallow apparatus insulators
- Dead-end insulators
- Solid core insulators
3). Name the Interlockings provided with Isolators.
The interlocking enabled with isolators include:
- Interlocking between 3 poles allows for simultaneous action.
- Interlocking with the circuit breakers.
4). What is Creepage Distance?
Creepage distance is the smallest distance between 2 conducting locations on the insulating material’s surface.
5). What is the Basic Impulse Level (BIL)?
Basic Impulse Level (BIL) refers to the peak value of lightning-induced voltage withstand capabilities of the equipment.
6). What are the disadvantages of Corona?
The disadvantages of Corona include:
- Corona causes power loss.
- Corona produces unacceptable noise.
- Corona causes radio interference.
7). In what way is an isolator different from an Air-Break Switch?
Isolators are utilized to connect (or) disconnect a line entirely when there is no load, whereas air-break switches are utilized to create and break a circuit when there is a load. Arc control devices are included into air-break switches.
8). What is a circuit breaker?
A circuit breaker is a mechanical device that closes or opens contact members, thus closing (or) opening an electrical circuit under normal (or) abnormal conditions.
9). Do we use AC (or) DC to charge a Battery?
A battery must be charged using direct current.
10). State any four types of substations according to the service?
The substations are classified as
- Transformer substations,
- Switching substations,
- Converting substations and
- Frequency changing substations.
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