(GS) 3-
1.3 Relay connection and power-up
Before powering-up the relay, confirm that the relay power supply voltage and nominal ac
signal magnitudes are appropriate for your application. The relay serial number, and the
relay’s current and voltage rating, power rating information can be viewed under the top
hinged cover. The relay is available in the following auxiliary voltage versions and these are
specified in the table below:
Nominal Ranges
Operative dc
Range
Operative ac
Range
24 - 48V dc 19 to 65V -
48 - 110V dc (30 - 100V ac rms) ** 37 to 150V 24 to 110V
110 - 250V dc (100 - 240V ac rms) ** 87 to 300V 80 to 265V
** rated for ac or dc operation
Please note that the label does not specify the logic input ratings. The P74x relays are fitted
with universal opto isolated logic inputs that can be programmed for the nominal battery
voltage of the circuit of which they are a part. See ‘Universal Opto input’ in the Firmware
section for more information on logic input specifications. Please note that the opto inputs
have a maximum input voltage rating of 300V dc at any setting.
Once the ratings have been verified for the application, connect external power capable of
delivering the power requirements specified on the label to perform the relay familiarization
procedures. Figures 3, 4 and 5 indicate the location of the power supply terminals but please
refer to the wiring diagrams in the Installation section for complete installation details
ensuring that the correct polarities are observed in the case of dc supply.
1.4 Introduction to the user interfaces and settings options
The relay has three user interfaces:
− The front panel user interface via the LCD and keypad
− The front port which supports Courier communication
− The rear port which supports one protocol: Courier. (IEC 60870-5-103 is converted
from Courier using a KITZ274).
− The optional Ethernet port which supports IEC 61850
The measurement information and relay settings that can be accessed from the four
interfaces are summarized in Table 1.
To Next Page
Loading...
