Publicité
Les langues disponibles
Les langues disponibles
Differential relays
dder Ring Current Transformers
Use of adder ring current transformers
If insulation problems or with the dimensions of the cables/bars
of the line to be protected don't allow to use ring current transfor-
mers (max. hole diameter 300mm), it is possible to use measuring
current transformers with 5 secondary winding and same primary
currents, accuracy class 0,5 or 1.
Choice of the adder ring current transformer
Transformer ratio: according to the used measuring current
transformer ratio.
In case of connection with measuring current transformer
with ratio higher than 400/5 the IDn intervention current
values which can be selected on the differential relay are
multiplied by 10.
CT
100...400
∆n
30m ...30
CT
500...5000
x 10
∆n
300m ...300
0
Delta TCS Controller
Switch opening circuit controller with current launch coil, model Delta TCS
It guarantees the reliability of the differential protection by monitoring the efficiency of the
release circuit of one or two current launch coil switches and signaling the opening circuit
breakdown through alarm display (front LED) and output relay intervention. It can be used
for all the applications which use the current launch coil circuit to control its efficiency
(for instance safety circuits, acoustic and visual signaling of states of alarm, fire pumps, etc.)
L1
L2
L3
N
F1
F1
F2
F2
AC
AC
DC
DC
1 1
2 2
Test
Test
1 1 1
2 2 2
Ok
Ok
Fault
Fault
Ok
Ok
Fault
Fault
Ba
L1
L2
L3
N
0n
0ff
h.f.filter
~
TD
LE12569
_E 10/20 - 01IM cod.RD4B21.B
Publicité
