Sices D-PRO, Technical Manual

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D-PRO Protection relay Technical Manual 17
Using the AND/OR logics (see par.4.4.2
), you can “copy” the internal status on a physical
output.
4.6
4.6.1
The connection to the genset is made through the connector JH of the controller.
Three-phase connection:
•
Connect phase L1 (or R) to terminal 3 of JH connector.
•
Connect phase L2 (or S) to terminal 2 of JH connector.
•
Connect phase L3 (or T) to terminal 1 of JH connector.
•
Connect neutral (N) to terminal 4 of JH connector.
Single-phase connection:
•
Connect phase (L) to terminal 3 of JH connector.
•
Connect neutral (N) to terminal 4 of JH connector.
The parameter P.0101allows to select the three-phase/single-phase mode.
If working voltages are greater than these values, step-down transformer must be used in
order to respect the specified limits. The nominal voltages on the primary and secondary side
of the voltage transformer are adjustable by means of the related parameters. Voltage
transformers having a nominal voltage of 400V on the secondary side are the solution that
preserves the best available measurement precision of the board.
In option, it is possible to order a version of the device with max 100Vac (phase-phase) voltage
inputs to be used with VT with 100V secondary ones. In this case, the P.0151 parameter
should be configured for 100V operation.
Warning! Do not connect devices provided with optional 100V inputs directly to mains
or to 400V bus bar, in order not to damage the device.
4.6.2
The device, in case of three-phase connection, can work both with and without neutral
connection; the selection is carried out by means of the parameter P.0129. If the system is
configured with the neutral connection, the neutral voltage is measured with respect ot GND.
4.6.3
The JG terminal allows the acquisition of the homopolar voltage (Residual voltage). It
represents the voltage of the real star point voltage of the plant with respect to the ideal one,
which coincides with the triangle barycentre of the phase-to-phase voltages.
4.6.4
The currents measure must be carried out exclusively by means of current transformers (CTs).
Do not connect the mains voltage conductors to JE or JF.
Some external current transformers can be connected to a 5A or 1A secondary: the controller
internally manages an adjustable scale change for each of the two currents (P.0112 and
P.0117), which guarantees the same measurement accuracy with both types of transformers.