Question
Download Solution PDFWhich of the following should be used under no-load conditions?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFIsolator:
- An isolator is a manually operated mechanical switch which separates a part of the electrical power.
- Isolators are used to open a circuit under no load.
- Its main purpose is to isolate one portion of the circuit from the other and is not intended to be opened while the current is flowing in the line.
- Isolators are generally used on both ends of the breaker so that repair or replacement of a circuit breaker can be done without any danger.
Rewireable fuse:
- A fuse is a part of the circuit that consists of a conductor that melts easily and breaks the connection when the current exceeds the predetermined value.
- The function of fuse wire is to carry the normal current without excessive heating but more than normal current when passes through fuse wire, it rapidly heats up and melts.
- The materials used for fuse wires are mainly tin, lead, zinc, silver, antimony, copper, aluminum, etc.
- Rewireable fuses are used to open a circuit under loaded conditions.
Circuit breaker:
- An electrical circuit breaker is a switching device which can be operated manually and automatically for controlling and protecting an electrical power system.
- During a short circuit fault or any other type of electrical fault, a high fault current will flow through this equipment as well as the power network itself.
- So a circuit breaker is needed to break the circuit and quenching the arc produced by the potential energy stored during braking.
- It is operated under loaded conditions.
Air-break switch:
- The switch whose contacts open in the air and quenching of an arc achieves by compressed air, such type of switch is called an air break switch.
- The air acts as a dielectric medium for the air-break switch.
- It is more effective and reliable as compared to another switch.
- The maximum voltage for the switches is up to 35 kV.
- The air-break switches are classified into two types. They are Single-Pole Air-Break Switch and the Gang Operated Air-Break Switch.
Last updated on Jul 1, 2025
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