Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / vijay
Vector surge relay compares the previous cycle with the
latest. If there is a considerable import or export ( say
20 % ) of the genrator capacity then a sudden disconnection
of the grid supply will cause either a load throw off in
case of export and load on in case of import. This will
cause the generators either underloaded or overloaded (
over accelerated or deaccelerated ) . This loading and
unloading on the generator will shift the cycle of the
genrator by some degrees. If this difference in cycle is
within the trip setting of the relay the relay will
generate a tripping command.
For example
50 HZ frequecy cycle means 50 Cycle / Second
so 1 cycle will take 20 msec
20 msec = 360 deg ( Angle for 1 full cycle )
1 msec = 18 Deg
If the relay setting is at 9 deg means a time delay of 0.5
msec in crossing of previous cycle happen then the relay
will trip.
If the cycle measurement repetation is of 4 cycle then the
relay will compare the previous 4 cycles.
| Is This Answer Correct ? | 36 Yes | 2 No |
Post New Answer View All Answers
1.WHAT IS A SMART CAPABLE DB ( DISTRIBUTION BOX) ? 2. HOW TO DECIDE THE TYPE OF DB TO BE USED ( RECESSED/ PLUG TYPE/ SMART ETC ETC? 3. WHAT IS MILLENEUM BUS BAR USED IN DB? 4.DIFFERENTIATE MCCB AND MCB.
How many VSC based HVDC are there in India and the world
What is the actual calculation for transformer short circuit test?.
How should i design a 1ph & 3 ph transformer. Kindly let meknow all steps and formulaes related to design from scratch.
Meaning of ingrace protection for motor.for ex IPXY
do you have some of interview Questions in power and genrator section in general whith answers
Vaccum circuit breaker
what is the formula for computing cable tray size & capacity
HOW TO CALCULATE THE REGULATION OF 100 AND 25 KVA TRANSFORMER
Write down the name of 2 lady Bir Pratin of Bangladesh
What effect does a very low impedance have on the Voltage regulation? On the short-circuit current?
How Can You Relate Power Engineering With Electrical Engineering?
what is solkor relay and which condition it will act?
How to calculate cable size in HT AND LT
Explain about Dubai electrical sysaem? Explain about Dubai drinking water system? Explain about Dubai Burj tallest building Electrical,Water.etc.. maintenance system?
