What is negative phase sequence?
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
What is the gross weight to copper ratio in slip ring induction motor of 4000 HP,6.6 kv, 372amp, 992 rpm GE motor.
im electrical engineer, could any one help me for FEWA exam questions please ?
we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.
Metal covered multiconductor cables shall employ a marker tape located within the cable running for its complete length in lieu of cable surface marking. Is it true or false?
Write masons gain formula.
What are the different losses In a de mac1une'! t.xplam
how to calculate mf when meter and cTPT detail are given
Briefly describe your ideal job?
What is the maximum operating temperature for a thermoplastic insulated cable?
How to select, design,size & calculate for 11 KV/33KV/66KV/132KV/220 KV/440 KV circuit breaker for HT side of transformer protection/HT distribution protection?
How to calculat the ratio of HT\LT in energy meter
WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V DISTRIBUTION TRANSFORMER. AND AIR GAP VALUE OF 25 KV BUSHING OF AT TRANSFORMER OF 25 KV TRACTION. WHAT IS THE CALCULATION FOR THE AIR GAP PERMITTED FOR BUSHINGS AT DIFFERENT VOLTAGES.
what are the major & minor faults that occur in an inverter and in UPS ? And how to repair and resolve them ?
can u tell me the promotion from oiller to enginer
What is cathode ray oscilloscope (cro)?