Different types of Starter for Motor

Different types of Starter for Motor 1)DC -TWO point starter A two-point starter is used for starting dc motor which has the problem of over-speeding due to loss of load from its shaft. -Three point starter A three-point starter is used for starting a dc shunt or compound motor. The coil of the hold-on electromagnet is connected is series with the shunt-field coil. - Four point starter The...

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Air Insulated Switch-gear VS Gas Insulated Switch-gear

Air Insulated Switch-gear VS Gas Insulated Switch-gear Gas Insulated Switch-Gear Air Insulated Switch-Gear Limitations of Air Insulated Switchgears (AISs)Large dimensions due to statutory clearances & poor dielectric strength of air Insulation deterioration with ambient conditions and susceptibility...

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Why we are use 11KV / 22KV / 33KV / 66KV / 110KV / 230KV / 440KV this type of ratio?

Why we are use 11KV / 22KV / 33KV / 66KV / 110KV / 230KV / 440KV this type of ratio. Why can’t we use other voltage ratio like 54KV / 99KV etc? When an alternator generates voltage, we always use a multiple of 1.11 because for a pure sine wave the FORM FACTOR is the  ratio of rms value...

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Different type of motors...

Different type of motors..... Squirrel Cage Motor   Electric Motor An Electric motor is a machine which converts electric energy into mechanical energy. Its action is based on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a mechanical...

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How to choose transformer rating?

 How to choose transformer rating? When an installation is to be supplied directly from a MV/LV transformer and the maximum apparent-power loading of the installation has been determined, a suitable rating for the transformer can be decided, taking into account the following considerations: The...

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Electrical Switchgear Protection

Definition of Switchgear A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, metering and regulating of electrical power system. Assembly of such devices...

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Differences between E.M.F and Voltage (P.d)

Differences between E.M.F and Voltage (P.d) The following are the difference between E.M.F and P.D. The name E.M.F at first sight implies that it is a force that causes current to flow.But this is not correct because it is not a forced but energy supplied to charge some active device such as battery. E.M.F maintains p.d. while p.d. cause current to flow. When we say that E.M.F of a device...

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