Poznámky redaktora
Pay particular attention the types cable, the connections earth and the recom ended axim distances. 11.3.3.c A
TT with neutral A
TT without neutral n.This ill enable satisfy all the international reference standards and guarantee perfect operation of
the relay even under severe environm ental and electrom agnetic conditions. and/or disconnected essages ust appear; they
do, not close the circuit-breaker ediately and make the correct connections.
The VTs must have performance coming between the values and 20VA inclusive, insulation between the primary and
Installation system
"VT Standard" type transform er
(Star/Star)
"VT Standard" type transform er
(Delta/Delta)
Application diagram Application diagram
TN-C A
TN-S A
IT with neutral A
IT n.3.3 and connection test
A
If the PR123/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.4 Test
Before putting into service, test can conducted means the specific "Auto test" function which
can activated the PR123/P. With enabled, the Voltage Transformer Inpresent data will set and VT's phase-to-phase primary
and secondary voltage properly adjusted.
The shield ust connected earth both sides. positive
result shown the circuit-breaker opening. No.
VT Standard: Single standard transformers, see par.1 Current sensor connection for external neutral
A
If you rre xte tra irc it-b r,
rem InN.
The following summary table standard connections according the type plant. 14.
94/158
1/6
CB status
.14.7.1.2). customer considers this value too
high has residual current protection which risks being tripped, then application diagram must used.3.c 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 configurations without
neutral; the used, the current thereon could around dozen mA.
Auto Test
Trip Test (disabled)
CBopen
Model 2234 Apparatus Scale
L2778
Doc.1 ction s
A
For the connections provided the user, recom ended that you com ply strictly ith the recom endations contained
in this docum ent.
14.
Use VTs ith shield, connected earth (see standard par.3.
Check the open closed state the circuit-breaker the same "PR123/P Test" screen, checking that
the closed and de-energized.
A
A
The axim length the PR120/V iring ust not exceed meters.
- for and systems with neutral, the connection must made N.
Use corded shielded o-w ire cable (see note par.
Then test can conducted the whole chain, again using the specific function (Trip test). 2
Page No. 15.2).
14.2. rin irc it-b ope and ly
is .
A pplication diagram pplication diagram B
N L3
f —
A1 bi
B1i «1
A2
B21
b2
^a2
A3
53^
b3
[ a3
it:::::::::
in i:::::::
H H
1>+ 1
14.
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.3 Putting into service
14. positive result shown the display.1.2 connections
A ielectric strength tests are not allowed the inputs and outputs the releases the secondary lines any
c VTs.3.To run Trip Test, press the Test" button and the "Enter"
button simultaneously.
14
