P746/EN CM/F21
Commissioning and Maintenance
(CM) 10-14
MiCOM P746
CM
4.2.8.2
EIA(RS)485 configuration
If an EIA(RS)485 to EIA(RS)232 converter (Schneider Electric CK222) is installed, connect a
portable PC running the appropriate software (e.g. MiCOM S1 V2 or Studio) to the
EIA(RS)232 side of the converter and the second rear communications port of the relay to
the EIA(RS)485 side of the converter.
Ensure that the communications baud rate and parity settings in the application software are
set the same as those in the relay. The relays courier address in cell
[0E90:COMMUNICATIONS, RP2 Address] must be set to a value between 1 and 254. The
second rear communications port configuration [0E88: COMMUNICATIONS RP2 Port
Config.] must be set to EIA(RS)485.
Check that communications can be established with this relay using the portable PC.
4.2.8.3
EIA(RS)232 configuration
Connect a portable PC running the appropriate software (e.g. MiCOM S1 V2 or Studio) to
the rear EIA(RS)2321 port of the relay.
The second rear communications port connects via the 9-way female D-type connector
(SK4). The connection is compliant to EIA(RS)574.
Connections to the second rear port configured for EIA(RS)232 operation can be made using
a screened multi-core communication cable up to 15m long, or a total capacitance of 2500pF.
The cable should be terminated at the relay end with a 9-way, metal shelled, D-type male
plug.
Ensure that the communications baud rate and parity settings in the application software are
set the same as those in the relay. The relays courier address in cell
[0E90:COMMUNICATIONS, RP2 Address] must be set to a value between 1 and 254. The
second rear communications port configuration [0E88: COMMUNICATIONS RP2 Port
Config.] must be set to EIA(RS)232.
Check that communications can be established with this relay using the portable PC.
4.2.9 Current
inputs
This test verifies that the accuracy of current measurement is within the acceptable
tolerances.
All relays will leave the factory set for operation at a system frequency of 50Hz.
If operation at 60Hz is required then this must be set in cell [SYSTEM DATA, Frequency].
Apply current equal to the line current transformer secondary winding rating to each current
transformer input of the corresponding rating in turn, see Table 1 or external connection
diagram (P746/EN CO) for appropriate terminal numbers, checking its magnitude using a
multimeter. The corresponding reading can then be checked in the relay’s
MEASUREMENTS 1 column and value displayed recorded.
The measured current values displayed on the relay LCD or a portable PC connected to the
front communication port will either be in primary or secondary Amperes. If cell [MEASURE’T
SETUP, Local Values] is set to ‘Primary’, the values displayed should be equal to the applied
current multiplied by the corresponding current transformer ratio set in the ‘CT and VT
RATIOS’ menu column (see Table 5). If cell [MEASURE’T SETUP, Local Values] is set to
‘Secondary’, the value displayed should be equal to the applied current.
Содержание MiCOM P746
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