Siemens 7SR242 - Section 6: Other Features; Data Communications and Maintenance

7SR242 Duobias Description Of Operation
©2010 Siemens Protection Devices Limited Chapter 1 Page 48 of 52
Section 6: Other Features
6.1 Data Communications
Two communication ports, COM1 and COM2 are provided as standard. RS485 connections are available on the
terminal blocks at the rear of the relay (COM1). A USB port, COM 2, is provided at the front of the relay for local
access using a PC.
Optionally, additional communication ports are available: -
2 x fibre optic with ST connectors (COM3 and COM4) and 1x IRIG-B
1 x RS485 (COM3) and 1x IRIG-B
1 x RS232 (COM3) and 1 x IRIG-B
Communication is compatible with Modbus-RTU, IEC60870-5-103 FT 1.2 and optionally DNP3.0 transmission
and application standards.
Communication with the relay from a personal computer (PC) is facilitated by the REYDISP EVOLUTION
software package. The program allows the transfer of relay settings, waveform records, event records, fault data
records, Instruments/meters and control functions. REYDISP EVOLUTION is compatible with IEC60870-5-103.
Data communications operation is described in detail in Chapter 4 of this manual.
6.2 Maintenance
6.2.1 Output Matrix Test
The feature is available from the Relay fascia and allows the user to operate binary outputs or LEDs assigned to
relay functions.
Any protection function which is enabled in the setting menu will appear in the Output Matrix Test.
6.2.2 CB Counters
Four CB trip counters are provided:
CB1 Total Trip Count: Increments on each trip command issued.
CB1 Delta Trip Count: Additional counter which can be reset independently of the
Total Trip Counter. This can be used, for example, for
recording trip operations between visits to a substation.
CB2 Total Trip Count As CB1
CB2 Delta Trip Count: As CB1
The status of each counter can be viewed in the INSTRUMENTS mode.
Binary outputs can be mapped to each of the above counters, these outputs are energised when the
user defined Count Target is reached.
6.2.3 I
2
t CB Wear
CB1 and CB2 wear counters are also provided:
I
2
t CB1 Wear: Provides an estimate of contact wear and maintenance
requirements. The algorithm works on a per phase basis,
measuring the arcing current during faults. The I
2
t value at