What is differential relay ? where it can be used?
Differential relay is one that operates when the phasor
difference of two or more similar electrical quantities
exceed a predetermined value. Thus a current differential
relay is one that compares the current entering a section
of the system with current leaving the section.Under normal
operating conditions, the two currents are equal but as
soon as fault occurs, this condition no longer applies. The
difference between the incoming and outgoing currents is
arranged to flow through relay operating coil. If this
difference is equal to or grater than the pick up value the
relay will operate and open the circuit breaker and isolate
the faulty section.
mainly used in two winding transformers
Is This Answer Correct ? | 14 Yes | 0 No |
how to identify conection leads of an unknown electric motor
1.what is the difference between transformer differential and busbar differential.2)why we are using 2 slope for trafo diif and 1 slope for busbar diff.3)what is the purpose of metrosil and stabilizing resistor in high impedance relay circuit.4)how metrosil reduce the peak volage.5)what is the funtion of stabilizing resistor
Why inductor short on dc and capacitor allow to flow ac?
a governer in an Ic engine controls the
how Practicaly reduce stating current of the motor
what is the differences between single phase ind. motor and three phase ind.motor?
What is surger vector in 33Kv transmission feeder? We have AC power generator of 8MW which is paralleled with 33Kv EB grid. Some times our HT breaker gets trip off due to surge vector problem. How to over come it? Is there any device to observe the surge and avoid tripping?
What is meant by single line diagram?
low voltage distribution is done by a)3 phase 3 wire b)3 phase 4 wire c)single phase
PLEASE SEND THE PREVIOUS YEARS QUESTION PAPERS OF RRB JUNIOR ENGINEER-ELECTRICAL
what is mean by induction & conduction principle ? how they differ from each other ? thank you
why the blede and jow of isoletor demage in substation?explan.