Interested to Buy Any Domain ? << Click Here >> for more details...
What is negative phase sequence?
- 7 Answers
- 92462 Views
- Hindalco, Universal Associate, I also Faced
- E-Mail Answers
Answer Posted / karma gyeltshen
An Negative Phase Sequence Current is usually caused by asymmetrical loading of the three phases, but may also be the an open-circuit phase (single-phasing).
An asymmetrical load on a generator produces a magnetic filed, which rotates in the opposite direction to the positive sequence field. The negative phase sequence flux induces currents in the rotor and these results in additional rotor losses and increased rotor temperature. The latter can represent a hazard for the rotor and this is the reason for applying NPS protection.
| Is This Answer Correct ? | 32 Yes | 0 No |
Post New Answer View All Answers
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.
if the load is 80 amp for main fuse and 100 amp for breaker so how can we calculate the cable size (cooper ) .
How we calculate the Multiplying Factor of Kwh meter for 3 phase alternator.
we have 2.2kw,Y,3000rpm motor but 6leads found in TB what happen if we connect in delta?
How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.
What is the meaning of Insulation H for transformers????
would the same effect be achieved by reversing the connection to one winding of the induction motor 3-phase?
What is the tests required for a 132 kV, 400 kV , 765 kV for a Circuit Breaker and Power Transformer before commissioning ?
Use of switch mode power converter in real-time basis?
What is the formula formula for Busbar sizing and what are the things to be consider for Busbar Calculation?
What are the raitings of Mcb,mccb and Acb in detail ??
why occ characteristics curve in not tracing back when we are bringing back the rhoestat?
how to find out 3 phase complex power in per unit in unbalanced system?
From reading, Under voltage relay used also as phase sequence relay now, Why I use under voltage and phase sequence relay in the same circuit (ATS)?
A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.
