(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 61 of 66
Section 6: Other Features
6.1 DATA COMMUNICATIONS
Two communication ports, COM1 and COM2 are provided. 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.
Other rear mounted communication ports are available as an optional extra - two fibre optic
communication ports with ST connectors plus IRIG B (COM 3 and COM 4), a RS232 port plus IRIG B
(COM 3) or a RS485 port plus IRIG B (COM 3).
Communication is compatible with Modbus-RTU, IEC60870-5-103 FT 1.2 and DNP 3.0 transmission
and application standards.
For communication with the relay via a PC (personal computer) a user-friendly software package,
Reydisp Evolution, is available to allow 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 Section 4 of this manual.
6.2 CB MAINTENANCE
Several CB trip operations counters are provided:
CB Total Trip Count:
Increments on each trip command issued. During an
auto-reclose sequence, when the target count is
reached the relay will perform one Delayed Trip and
lockout*.
CB 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.
CB Count to AR Block:
Displays the number of CB trips experienced by the
CB. When the target is reached the relay will only do 1
Delayed Trip to Lockout.
CB Frequent Ops Count Logs the number of trip operations in a rolling window
period of one hour. During an auto-reclose sequence,
when the target count is reached the relay will perform
one Delayed Trip and lockout*.
CB LO Handle Ops
Displays the number of CB (lock out) LO Handle Ops
experienced by the CB. When the target is reached the
relay will only do 1 Delayed Trip to Lockout.
*NB: If Delayed Trips are not assigned in the AUTORECLOSE PROT’N menu the relay will not trip.
An I
2
t counter is also included; this can provide an estimation of contact wear and maintenance
requirements. The I
2
t value at the time of trip is added to the previously stored value.
Binary outputs can be mapped to each of the above counters, these outputs are energised when the
user defined Count Target or Alarm Limit is reached.
The counters do not increment for manual operations.
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