G.12
SEL-751 Relay Instruction Manual Date Code 20170927
IEC 60870-5-103 Communications
IEC 60870-5-103 Documentation
The [INF, FUN] pair needs to either be entered together or not entered at all.
The SEL-751 does not accept only one member of the [INF, FUN] pair. And
of course, the Label, Nominal, INF, and FUN can all be manually entered. No
other combinations are valid with the SEL-751.
Meter Quantities
The meter quantities are analog quantities in the SEL-751. In the SEL-751,
meter quantities are reported as ASDU type 205 (Non-Standard) with COT
type 1 (Spontaneous Events). The format of a meter quantity point within the
meter quantity map is “Label, [Scaling, [INF, FUN]].” Label represents any
valid meter quantity point accepted by the SEL-751. Scaling is the scaling
factor applied to the point prior to being sent out of the relay via the protocol.
Its range is 0.000 to 99999. The INF parameter is an integer in the range of 0
to 255. Similarly, the FUN parameter is an integer in the range of 0 to 255.
Label can be entered by itself with the SEL-751 choosing default parameters
for the Scaling, INF, and FUN. Label and Scaling can also be entered together
with the SEL-751 choosing default parameters for the INF and FUN. The
default parameter for INF is an available, unique value to use that is selected
by the SEL-751. The default parameter for FUN is 250. The default value for
Scaling is 1.
In any case, the [INF, FUN] pair needs to either be entered together or not
entered at all. The SEL-751 does not accept only one member of the [INF,
FUN] pair. If the [INF, FUN] pair has been entered, then Scaling must also be
entered.
The SEL-751 begins its response within 45 milliseconds of receiving a
complete request. The above classes define the IEC 60870-5-103 data map in
the SEL-751. The SEL-751 provides for only one IEC 60870-5-103 map. The
map consists of 332 definable points. These points include 100 binary input
points, 8 binary targets, 32 binary controls, 8 measurands (totaling 128 analog
quantities), 32 fault analogs, and 32 meter quantities.
Time Synchronization
The SEL-751 supports time synchronization as indicated with the 103TIME
parameter under the device port settings. If the value is set to yes, then the
device uses the time provided by the Master when the command is given, as
long as the SEL-751 is not connected to an external time source, e.g., IRIG or
SNTP. The SEL-751 sets the internal time validity bit to indicate proper
reception of the time synchronization command sequence from the Master.
The date and time should not be trusted unless the validity bit is set. Time
synchronization in the SEL-751 should only be used if IRIG or SNTP sources
are not available.
IEC 60870-5-103 Documentation
The IEC 60870-5-103 Configuration/Interoperability Guide for the SEL-751
is available on the supplied CD or as a download from the SEL website and
contains the standard device profile information for the SEL-751. Please refer
to this document for complete information on IEC 60870-5-103 configuration
and interoperability in the SEL-751.
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