212
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – COMMUNICATIONS GUIDE
DNP POINTS
CHAPTER 3: DNP COMMUNICATION
DNP TCP Connection Timeout
Range: 10 to 300 seconds in steps of 1
Default: 120 seconds
This setting specifies a time delay for the detection of dead network TCP connections. If
there is no data traffic on a DNP TCP connection for greater than the time specified by
this setting, the connection is aborted by the D90
Plus
. This frees the connection to be re-
used by a client.
Changes to this setting takes effect after power has been cycled to the relay.
DNP points
Binary input points
The DNP binary input data points are configured through the
Settings > Communications
> DNP > User Point List
menu item. When a freeze function is performed on a binary
counter point, the frozen value is available in the corresponding frozen counter point.
The binary input DNP parameters are as follows:
•
Static (steady-state) object number — 1
•
Change event object number — 2
•
Request function codes supported — 1 (read), 22 (assign class)
•
Static variation reported when variation 0 requested — 2 (binary input with status),
configurable
•
Change event variation reported when variation 0 requested — 2 (binary input change
with time), configurable
•
Change event scan rate —16 times per power system cycle
•
Change event buffer size — 500
•
Default class for all points — 1
Binary and control relay output points
The supported control relay output block fields are: Pulse On, Pulse Off, Latch On, Latch Off,
Paired Trip, and Paired Close.
The binary relay output DNP parameters are as follows:
•
Object number — 10
•
Request function codes supported — 1 (read)
•
Default variation reported when variation 0 requested — 2 (binary output status)
The control relay output block DNP parameters are as follows:
•
Object number — 12
•
Request function codes supported — 3 (select), 4 (operate), 5 (direct operate), 6 (direct
operate, no acknowledge)
The binary and control relay output points correspond to protection virtual inputs and
automation virtual inputs as follows. Point
N
corresponds to virtual input
N
+ 1. As such, we
have the following concordance:
Point 0
→
protection virtual input 1
Point 1
→
protection virtual input 2
Point 2
→
protection virtual input 3
...
Point 63
→
protection virtual input 64
