Specifications

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Doc. No
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
13.3.2. VT connections
WARNING: Dielectric strength tests are not allowed on the inputs and outputs of the releases or on the second-
ary lines of any connected VTs.
The following is a summary table of standard VT connections according to the type of plant.
VT Standard (A):
Single standard transformers, see par. 15.1.7.
The VTs must have a performance coming between the values of 10 and 20 VA inclusive, 4 kV insulation between the primary
and secondary.
Installation system
"VT Standard" type transformer
(Star/Star)
"VT Standard" type transformer
(Delta/Delta)
Application diagram Application diagram
TN-C B A
TN-S B A
IT with neutral B A
IT n.c A
TT with neutral B A
TT without neutral n.c A
Note for diagram B:
-
for TN-C systems the connection must be made to PEN;
- for TN-S systems the connection must be made to N for configurations with neutral or PE for configurations without
neutral; if the PE is used, the current thereon could be around a dozen mA. If a customer considers this value too high
or has a residual current protection which risks being tripped, then application diagram A must be used;
- for IT and TT systems with neutral, the connection must be made to N.
Application diagram B
Application diagram A
N
13.3.3. CS and TC connection test
WARNING: If the PR122/P was installed by the user, it is important, before closing the CB, to check the last line
on the display when the relay is turned on for the first time via a PR030/B battery unit. No CS and/or TC discon-
nected messages must appear; if they do, do not close the circuit-breaker and make the correct connections.
13.3.4. Test
Before putting into service, a test can be conducted by means of the specific “Auto test” function
which can be activated on the PR122/P. A positive result is shown on the display.
Then a test can be conducted on the whole TC chain, again using the specific function (Trip
test). A positive result is shown by the circuit-breaker opening. To run a Trip Test, press the “i
Test” button and the “Enter” button simultaneously.
Check the open or closed state of the circuit-breaker on the same “PR122/P Test” screen, by
checking that is closed and de-energized.
13.3.5. Initial settings
If the PR122/P is supplied ready installed in the circuit-breaker, it is up to ABB SACE to set all the variables referring to the circuit-
breaker or the specific application correctly (e.g. type of circuit-breaker, Rating Plug size ...). When the PR120/V module is installed,
set the Rated Voltage suitably.
Vice versa, if the PR122/P is supplied separately, it will be up to the user to set all the necessary parameters correctly.
Note that ABB SACE defines each possible setting according the content of the paragraph on the default parameters (see par.
13.4.4).
WARNING: Apart from this, it is absolutely indispensable for the user to modify the password and carefully
define each modifiable parameter, before putting the PR122/P into service.
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CB open
Auto Test
Trip Test (disabled)
CB status
Test