RATING OF LIGHTENING ARRESTER FOR 11 KV LINE IS 9 KV BUT WE
KNOW THAT LIGHTENING ARRESTER IS USED FOR OVER VOLTAGE
PROTECTION SO WHY NOT THE RATING OF LIGHTENING ARRESTER BE
MORE THAN 11KV ???????????????//
- 5 Answers
- 50638 Views
- Hakel, I also Faced
- E-Mail Answers
Answer Posted / elangovan t
Lightning arrester is to protect the system from any high
voltages such as lightning.
If the system voltage is 11kv, then the phase voltage will
be 11/sqrt(3)=6.35kv. It means the RMS voltage of the phase.
The maximum voltage or the peak voltage across the arrester
and earth will be 6.35*sqrt(2)=8.98kv.i.e 9kv.
Therefore, for 11kv line it is rated for 9kv.
| Is This Answer Correct ? | 135 Yes | 10 No |
Post New Answer View All Answers
Explain how to determine capacitor tolerance codes?
What is the suitable transmission voltage?
In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes
a 230v transformer with step down ratio 19:1.it has 2000turns on primary and rated 25va calculate max primary current no of secondary turns volts/turn
what are the steps involved in generator load test?
63MVA,220KV/6.9KV Transformer LV side neutral is connected to Earth pit through NGR. Whether this earth pit required to connect with near by below grouding earth mat or it is to be kept separate?
why to use freewheeling diode ( diode in revers bias mode) across dc coil
What is Primary And Secondary Injection Test of Relay and Other Electrical Devices. How IT is carried out.
Calculate torque developed by the 3-phase, 5 H.P., 4 pole induction motor runs at 1500 rpm A 23 N-m B 21 N-m C 10 N-m D 0 N-m
Why does curving the pole faces in a dc machine contributes to a smoother dc output voltage from it?
What are differences between Voltage, EMF & Potential difference ?
what is meaning of 230volts ac 50hzs ac supply is it rms or maximum to getting ac 230v what amount of max voltage they will send
Block diagram of Power line communication?
What is the classification of hydro projects based on installed capacity?
What is meant by positive and negative feedback?
