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6 REF protection - CT and secondary wiring resistance
This test is to be applied to each of the restricted earth fault protections.
•
Isolate the auxiliary supplies
•
Remove the trip and intertrip links
Refer to the calculated data for the REF protection settings. This will give the maximum permissible lead
resistance values.
Measure the resistance of the wiring between the relay equipment and the CTs. The readings obtained should be
recorded in table 2 below. These should be approximately equal to or less than the values used in the calculated
settings for the restricted earth fault function. This measurement is taken to ensure the REF calculations used
suitable data and will be stable for through earth faults.
7 Relay power supply
Remove the relay front cover to give access to all the fascia push buttons. Relays are provided with a power
supply suitable for one of the standard auxiliary supply ratings of 24V, 30V, 48V, 110V, 220V d.c. Ensure that the
actual supply is within the range of the Vx marked on the relay fascia. Ensure the polarity of the supply is correct
before energising the relay. The minimum recommended fuse rating of the supply is 12 amps.
It is normal for the relay to take some time while booting up.
With the relay energised the green LED will provide a steady illumination. None of the red LED's should be
illuminated after the relay has completed booting up. Operate the TEST/RESET button and check that all the red
LEDs are illuminated while the push is depressed.
8 Programming the Relay
The relay can either be set using the fascia buttons or from a laptop PC running Reydisp Evolution. Due to the
number of settings, it is recommended that the laptop method be used for speed and ease of commissioning.
8.1 Setting by Laptop PC
The relay is supplied with a 25pin RS232C type communications port on the front of the fascia. This should be
connected to a laptop using a 25 to 9 pin RS232 cable. Alternatively a USB connection to the laptop may be used,
but this may require some Reydisp Configuration changes. Reydisp Evolution should be installed on the laptop,
and this should run on any MS Windows © operating system.
To use the relay communications port the Communications Settings in the relay, must match the Communications
settings selected in the Reydisp Evolution software.
To change the communications settings on the relay use the following procedure. On the relay fascia, keep
tapping the
key until the COMMUNICATIONS MENU is displayed on the relay LCD. Press the TEST/RESET
once to bring up the STATION ADDRESS on the LCD. Press the ENTER button to alter the address to any
desired number between 1 and 254. Set each relay communication address to a unique number. The address
selected on the relay and the relay address selected on Reydisp Evolution must be set identically. The relay
address can be changed by pressing the
Continue to scroll down and set IEC 870 ON PORT to COM2 (front RS232 and bottom rear fibre ports are COMM
2 relay ports) and set AUTO DETECT to ON. The Auto Detect feature will automatically toggle the active port to
the front RS232 from the bottom rear fibre port when connection is made.
Ensure that the Communications baud rate and parity check settings on the Reydisp Evolution software and
Relay are the same. It is advisable to select the maximum baud rate on the relay and Reydisp Evolution to
speeds up response times.
The communications setting can be changed in Reydisp Evolution by selecting:
OPTIONS -> COMMUNICATIONS. Note this window displays the active port of the laptop And not the relay.
Select "OK" when changes are complete. Set the address on Reydisp Evolution to be the same as the relay
station address.
©2010 Siemens Protection Devices Limited
or
buttons. Press ENTER to register the selected address number.
7SG14 Duobias-M-200 Commissioning
Chapter 7 Page 6 of 20
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