A group of machines (wind turbines) connected with 33KV
feeder and each machines are having individual VCB. The 33KV
feeder connected with 110KV/33KV substation. The 33KV feeder
tripped by over current at Substation and fault recorded at
Substation as OC-R&Y phase. Same time the group of machines
VCB tripped by over voltage, the fault recorded voltage was
above 66KV by numerical Under/Over voltage relay. While grid
drop time, this much of voltage hike is possible?
- 1 Answers
- 2689 Views
- I also Faced
- E-Mail Answers
Answer Posted / k.prakashchandra
The load throw-off may result in run-away speed being equal
to twice the normal speed ,hence the voltage may also become
twice. Over voltage relay should be set at not more than
120%.You can employ the AVR so that the voltage does not
increase with the speed.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
what irequirment need to be followed when working on live equipment
What is the importance of earthing?
What happen Grid EARTH plat got cut.
TRANSFORMERS WITH DC SUPPLY
for 4 MVA , 33K.V/6.6K.V transformer. secondary side the connected load is 3000H.P. What is the rating of capacitor bank to be insttaled.
what is LSR?
As we know diode work on both negative and positive but converting ac into DC we have to given a/c from negative of diode or positive side.please give me answer.
i m electrical diploma holder i want to do plc $ Scada some body tell me which insitute is best for me near chandigarh
-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.
why we need to us lenz's law for synchornous motor
What is Long rod insulator and it's applications..? merits over the disc insulator ..?
Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?
how to calculate the loss tangent of electrical cables
Where I can get the sample question for post of Junior engineer electrical-II For RRB Bhubaneswar.
What does Bode plot tell you?
