G.11
Date Code 20170927 Instruction Manual SEL-751 Relay
IEC 60870-5-103 Communications
IEC 60870-5-103 in the SEL-751
Binary Controls
In the SEL-751, two types of controls are permitted under this protocol. They
are as follows:
➤ Latching Single-Point: On/Off operations latch the point to 1 or
0, respectively. The points format is (Label, INF, FUN)
➤ Pulsing Single-Point: On operation pulses the point or triggers
the point. Off has no effect. The point format is (Label, INF,
FUN)
When controls are sent to the SEL-751 successfully, the relay responds with
ASDU type 1 (Time Tagged Message) and COT type 20 (Positive
Acknowledgment on Command) as well as with ASDU type 1 (Time Tagged
Message) and COT type 12 (Remote Operation) if the control was sent
remotely. The format of a binary control point within the binary control map is
“Label, [INF, FUN].” Label represents any valid binary control point accepted
by the SEL-751. 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 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 [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. Also,
the Label, INF, and FUN can all be manually entered. No other combinations
are valid with the SEL-751.
Measurands
In the SEL-751, a measurand is defined as a group of at most 16 analog
quantities with the same [INF, FUN] pair. The SEL-751 allows at most 8
measurands even if the measurand map is not completely filled with analog
quantities (total of 128). Measurands are refreshed for the Master at the
expiration of the 103CYC parameter and sent to the Master, once polled by
the Master.
In the SEL-751, measurands are reported as ASDU type 9 (Measurands II)
with COT type 2 (Cyclic). The format of an analog quantity within a
measurand in the measurand map is “Label, Nominal, [INF, FUN].” Label
represents any valid analog quantity accepted by the SEL-751. Nominal is the
nominal value applied to the point prior to being sent out of the relay via the
protocol. Its range is 0.001 to 999999.000. 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. You are required to enter the Nominal value. The Label and
Nominal values can be entered by themselves with the SEL-751 choosing
default parameters for 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.
FIC C-phase current of the fault event
FIG Ground current of the fault event
FIN Neutral current of the fault event
FFREQ Frequency of the fault event
FZ Fault impedance magnitude of the fault event
FZFA Fault impedance angle of the fault event
Table G.11 SEL-751 Analog Fault Quantities (Sheet 2 of 2)
Analog Fault Quantity Description
To Next Page
Loading...
