Why we not use the impedance relay in protection of short transmission line ?
Answer Posted / pritish
in case of short transmission line, the protection due to arc resistance is the major factor. hence , the relay should be selected which is less affected to arc resistance. and according to R-X diagram of impedance and reactance relay, the area of reactance relay is more and it is less affected to arc resistance fault but impedance relay is moderately affected due to arc resistance. so reactance relay is used in a short transmission line.
for more clarification, please email to pritish.nath@gmail.com
Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
what will happen if frequency is below 50 hz?
if i am in front of transmission line how to know that current direction without any equipment
how to select energy meter? have any calculation?
in HT service 3ph 4 wire service Y-phase voltage shows zero . whether it is meter fault? or what be the reason ? if y-ph voltage zero ,can current is recorded? reasons for failure?
Give details on how you intend to handle a challenging position you are posted to manage unexpectedly as a company staff?
if we look on phasor of the transformer vaoltage is 180 oppsite at primary and the secondary so to improve a power factor is secondary should kept negative to improve it primary side means is -.90 became +.90 at other side
What is stacking factor? What is its approximate value?
What is the resistance of the field winding of a d.c. Shunt generator kept low?
WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE
how to calculate
Difference between transition and diffusion capacitance
How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.
What is the technical difference between On delay timer and a Star delta timer?
Dear all, how we select the cable size according to current with or without including different correction factor , is there any direct method for sizing of cable...
how solar power plant energy meter multiplication factor