Recently we had experienced following problem
All RCCB breakers (connected to the load as well as spares)
connected to various UPS systems at various floors at a
high rise building tripped during a power break down and
upon starting up of generator.This Generator is recently
inducted into the installation. Can any one explain the
reason behind this tripping.
in the directional overcurrent and earthfault
protection,normally we are setting the angle 45 deg lead for
phase fault overcurrent and -45 deg lead for earthfault fro
forward direction.but both the fault are operating on the
same angle region only.why?how the relay will response?
in cvt,there are two windings,1a,1n and 2a,2n.in my one
project i use only one winding i.e.1a,1n. the other winding
is not in use, so i connect it in open delta and want to
close it by ibsertibg thermal resistor. the output of cvt
is 132kv/115/sqrt3. plesae tell me exact value of resistor,
so i may close it to avoid the resonance phenomenin. send
me answer on this email adress please.
PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND
FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT?
EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT