Specifications

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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
13.2.10.12. Trip curves for function RP
13.3. Putting into service
13.3.1. Connections
WARNING: For the connections provided by the user, it is recommended that you comply strictly with the recom-
mendations contained in this document.
This will enable us to satisfy all the international reference standards and guarantee perfect operation of the relay
even under severe environmental and electromagnetic conditions.
Pay particular attention to the types of cable, the connections to earth and the recommended maximum distances.
WARNING: The maximum length of the VT - PR120/V wiring must not exceed 15 meters.
Use corded shielded two-wire cable (see note A to par. 11.2.2).
The shield must be connected to earth on both sides.
WARNING: Use VTs with a shield, connected to earth (see standard VT par. 13.3.2).
The VTs should only be used for voltages > 690V; for lower voltages the presence of the PR120/V module con-
nected to the lower or higher busbars will be sufficient. With VT available, set the Voltage Transf. data to present
and suitably adjust the phase-to-phase primary and secondary voltage of the VT.
13.3.1.1. Current sensor connection for external neutral
WARNING: If you want to connect the current sensor for the external neutral conductor to a three-pole circuit-
breaker, remember to set I
n
N. accordingly. During this procedure, the circuit-breaker must be open and prefer-
ably isolated.