Areva MiCOM P225, Technical Manual

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Connection Diagrams P225/EN CO/B11
MiCOM P225 Page 5/12
2. CONNECTION
The rear face of the MiCOM P225 relay comprises at least 2 connectors. The relay may
have an optional green third connector dedicated to the connection:
−
of 10 temperature RTD sensors or 3 thermistors
−
of 2 analogue outputs.
2.1 Earth connection
The case shall be earthed according to the local standards.
2.2 Auxiliary power
The auxiliary power for the MiCOM P225 relay can be either Direct (range 24 - 60 Vdc, 48-
150Vdc, 130-250Vdc) or Alternating (100-250Vac –50/60Hz). The range of voltage is
specified on the relay indicator plate under the top flap of the front face. The power should
be connected to terminals 33 and 34 only.
A minimum 1.5mm² wire size is recommended.
2.3 Current inputs
The MiCOM P225 relay has 4 analogue inputs for phase and earth currents. The nominal
value of current of these measuring inputs is either 1 Amp or 5 Amp (according to the wiring
diagram). The operator can, for the same relay, mix the 1 and 5 Amp inputs (phase and
earth).
A minimum 2.5mm² wire size is recommended.
2.4 Voltage measurement input
The MiCOM P225 relay has one voltage input for phases A and C. The nominal value of
that input is either comprised between 57 and 130 Volts, or between 220 and 480 Volts.
A minimum 1mm² wire size is recommended.
2.5 Binary inputs
The MiCOM P220 relay has six opto-insulated logic inputs of which five are programmable.
Each input has its own polarity and it shall be powered :
−
with a dc voltage (relay auxiliary voltage ranges : 24-60 Vdc and 48-150 Vdc),
−
with either a dc voltage or an ac voltage (relay auxiliary voltage range : 130-250
Vdc/100-250 Vac).
Please refer to Chapter TD – Technical Specifications – of this guide for more informations.
The control and signalling functions to which the programmable logic inputs are assigned
can be selected by means of the AUTOMAT. CTRL menu.
A minimum 1mm² wire size is recommended.
N.B.: A 52a contact (CB auxiliary contact: open when CB is opened)
shall be wired to the binary input n°1 (terminals 22-24).
2.6 Output relays
Six output relays are available on the MiCOM P225 relay. Five relays are programmable, the
last relay being assigned to the signalling of an equipment fault (WATCH DOG). All these
relays are of the changeover type (1 common, 1 normally opened, 1 normally closed).
The protection and control functions to which these relays are assigned can be selected via
the AUTOMAT. CTRL menu.