Explain the experiment on ward leonard method of a speed control on a dc shunt motor with an suitable circuit diagram.

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What is Anemometer used to measure?

0 Answers   Blue Star,

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why in the three pin plug all 3 pins are cutted ?

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why lightning arrestor are made in two stack of insulator but why not cvt

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Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

1 Answers  

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According to IEC60034-14, When the vibration monitoring system required for motor Bearing. above which KW, it is required? and for what type of bearing the vibration probe is provided.

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what is the isolation transformer. what is the isolator?

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What the difference between three phase contactor (coil 110vac) & three phase SSR (control voltage 110Vac)? May I use contactor in place of SSR?

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What is rated value? is it phase values or line values?

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Can we use a Potential Transformer for Auxilliary Power supply( Spring charge Motor, Lighting etc)?

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why told ' x ' mer to transformer

1 Answers   Electrotherm,

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HARMONICS ARE ALWAYS IN INTEGER LIKE 2ND OR 3RD HARMONICS,NOT IN FRACTION LIKE 0.5 HARMONICS.....????????

2 Answers  

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