PowerPoint Presentation
Topic- SWITCH GEAR
INTRODUCTION
The electrical engineer is almost needed in every field of our life, therefore every effort is made to protect the power supply so as to maintain uninterrupted supply. For this purpose, means are provided to switch on or off generators, transmission lines, distributors and other equipment under both normal and abnormal conditions. This is achieved by switch gear which essentially consists of switching and protecting devices such as switches, fuses, circuit breakers, relays, isolators etc.
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SWITCH GEAR
The Apparatus including its associated auxiliary is employed for switching, controlling and protecting the electrical circuits and equipment is known as Switchgear.
SWITCH, ISOLATOR AND CIRCUIT BREAKER
Switch: It makes and breaks the circuit under full-load or no-load conditions but it cannot be operated under fault conditions. It is generally operate manually.
Isolator: It is only operated under no-load condition. Its main purpose is to isolate a portion of a circuit from the other. These oscillators are generally placed on both side of a circuit breaker in order to make repairs and maintenance on the circuit breaker without any danger.
Circuit Breaker: It makes and break the circuit under no-load, full-load or fault conditions. It can be operated manually under normal conditions and automatically and abnormal conditions.
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