Answer Posted / anindya chitta bagchi

.005ohms,according to IS Code 1961

Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

2181

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If increased the frequency up to 1000 then what changes shows in voltage?

2418

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if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

1896

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Is there a possibility to use such a treshold voltage for the NMOS part of a CMOS circuit that during the switching it will start conducting only after the PMOS part will be already closed, by this eliminating the leakedge current? Please note, I'm not asking about the well bias in standby mode, but about the "antileakedge" measures during normal operation.

2072

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Dear Respected sir how to test ABB REX521 protection relay by relay tester.

2747

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Comparision of Air break circuit breaker, SF6 Circuit breaker and vacuum circuit breaker.

2368

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what is mean by PIR in circuitbreaker and give me detail of that?

3524

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what is a pilot wiring and whys that called a pilot wiers

1925

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Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?

4392

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diff b/w normal grounding and resistance grounding

1941

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What does the term supermesh means?

1189

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what is interpose? where it is used and why it is used?

1062

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What is quadrantal symmetry?

1653

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H.t motor 6600 volt to same motor lt supply 440volt supply applyed to h.t motor to effect....

1891

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how to calculate earth fault relay current and CBCT ratio

8345

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