Answer / automation engineer

Single phase induction motor

Answer / brd ganesh

Single phase induction capacitor start and run
motor

Answer / murugan

Single phase permanant capacitor motor

When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

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a.c&d.c motor&generator

2 Answers   Vizag Steel,

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What is the range of efficiency of thermal or steam power plants? Why it is so low?

2 Answers  

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Pl. brief about break-down maintenance of machine tool.

0 Answers  

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What are the criteria shall be considers for sizing Fuse and MCB? If the rated current is 10Amps what should be the fuse size / MCB Size?

0 Answers  

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Testing procedure of DG alternator stability test

0 Answers   Amprotec,

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how diside ct mf exmp.200/5 ct

0 Answers  

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What are different types of control systems?

0 Answers  

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FOR WHICH FAULTS OR CONDITIONS DOES A TRANSFORMER DIFFERENTIAL PROTECTION DOES NOT OPERATE???

10 Answers  

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what is difference between 3.5 core and 4 core cable

5 Answers   Havells,

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why told ' x ' mer to transformer

1 Answers   Electrotherm,

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For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.

3 Answers  

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