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The VTs must have performance coming between the values and inclusive, insulation between the primary
and secondary.1.c A
TT with neutral A
TT without neutral n.
57/158
. customer considers this value too high
or has residual current protection which risks being tripped, then application diagram must used;
- for and systems with neutral, the connection must made N.
Then test can conducted the whole chain, again using the specific function (Trip test).
The axim length the PR120/V iring ust not exceed meters.3.
T 1/6
C s
A t
T rip )
C open
Model 2234 Apparatus Scale
L 2778
Doc.3.3 and connection test
A
If the PR122/P was installed the user, portant, before closing the CB, check the last line the display when the
relay turned for the first tim via PR030/B battery unit.1
A
Note for diagram for TN-C systems the connection must made PEN;
- for TN-S systems the connection must made for configurations with neutral for configurationswithout
neutral; the used, the current thereon could around dozen mA.
The shield ust connected earth both sides.7.3 utting into service
1 tio s
For the connections provided the user, recom ended you com ply strictly ith the recom endations
c t.3.2.c A
A
A
A
13.
1 tio s
Dielectric strength tests are not allowed the inputs and outputs the releases the secondary lines any connected VTs
The following summary table standard connections according the type plant. With available, set the Voltage Transf. positive result shown the display.To run Trip Test, press the Test" button and the "Enter"
button simultaneously.
The VTs should only used for voltages 690V; for lower voltages the presence the PR120/V module connected the lower
or higher busbars will sufficient. 2
Page No.4 Test
Before putting into service, test can conducted means the specific "Auto test" function which
can activated the PR122/P.
Use corded shielded o-w ire cable (see note par. positive
result shown the circuit-breaker opening.
VT (A): Single standard transformers, see par.2).
Installation system
"VT tra r
(S r/S r)
"VT Standard" type transform er
(Delta/Delta)
Application diagram Application diagram
TN-C A
TN-S A
IT with neutral A
IT n.
Current sensor connection for external neutral
If you rre xte tra circ it-b r,
re InN rin irc it-b pen and ly
is . and/or disconnected essages ust appear; they
do, not close the circuit-breaker and ake the correct connections.— -A3
B3i
b3
^a3
N L3
ai
+—
3 L
“ H>+c:
13.3. No.
Check the open closed state the circuit-breaker the same "PR122/P Test" screen, checking
that closed and de-energized.2). 11. 15.
A pplication diagram A
L1 L3
A pplication diagram B
A1 b1
B1i\ a1- HA2 b2
B2]^02
.
Use VTs ith shield, connected earth (see standard par.
This ill enable satisfy all the international reference standards and guarantee perfect operation the relay even under
severe environm ental and electrom agnetic conditions. data present and suitably adjust the phase-to-phase
primary and secondary voltage the VT.1.
Pay particular attention the types cable, the connections earth and the recom ended axim distances.3. 13.
13
