Crate LS1-131 Specifications download pdf (Page 100)

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Model

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1SDH000460R0002

L5439

14.3.2. 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:

Single standard transformers, see par. 15.1.7.

The VTs must have a performance coming between the values of 10 and 20VA 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 A B

TT without neutral n.c A

Note for B diagram:

- 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 BApplication diagram A

14.3.3. CS and TC connection test

WARNING: If the PR123/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 immediately and make the correct

connectionsi.

14.3.4. Test

Before putting into service, a test can be conducted by means of the specific “Auto test” function

which can be activated on the PR123/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 “PR123/P Test” screen,

checking that the CB is closed and de-energized.

14.3.5. Initial settings

If the PR123/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, user must properly set the rated voltage.

Vice versa, if the PR123/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.

14.4.4).

WARNING: Apart from this, it is absolutely indispensable for the user to modify the password and carefully

define each modifiable parameter, before putting the PR123/P into service.

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CB open

Auto Test

Trip Test (disabled)

CB status

Test

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Crate LS1-131 Specifications Page 100

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