what is a vector protection in transformer

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how does damper winding produces torque in synchronous motor?

1 Answers  

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why grid frequency varry time to time?

2 Answers  

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Explain advantages of storage batteries

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what is the function of commutator in dc motor?

10 Answers   CTS,

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How convergengr of nr method is not dependent on selection of slack bus and how gauss siedel method depends?

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What is the type of electrical earthing recommended in hard rock area

2 Answers  

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what will happen if synchronous machine rotor fed from single phase ac supply 

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Instrument connected to a single phase supply

0 Answers   Alstom,

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I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

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What is the operational principle of direct current current transformer and direct current potential transformer?if possible plz reply with ckt. diagram.

1 Answers  

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How does a transformer contribute towards the widespread popularity of ac system over dc?

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