Alstom MiCOM P846, Technical Manual

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SCADA Communications P846/EN SC/D
MiCOM P846 (SC) 13-17
SC
ts that maybe reported as off-line are:
−
Activate setting groups - Ensure setting groups are enabled
- Ensure remote CB control is enabled
3.5
alue from object 20, or as a ‘frozen’ value
from object 21. The running counters of object 20 accept the read, freeze and clear
unction takes the current value of the object 20 running counter and
3.6 Objec og input
O puts, c rmatio lumns in the
menu. points d as fixed d inside
the relay in a floating-p nv s the use of a
s , which d y the relay e.g. current, voltage,
p ngle etc. The ort at the end of the device profile
document with each ty um c. In the object 30 point list
e nt has a e
d set a The
deadband is the setting used to determine whether a change event should be generated for
events can be read via object 32 or object 60 and will be generated
1
bject 10 is not configurable.
Examples of object 10 poin
−
CB trip/close
−
Reset NPS thermal - Ensure NPS thermal protection is enabled
−
Reset thermal O/L - Ensure thermal overload protection is enabled
−
Reset RTD flags - Ensure RTD Inputs is enabled
−
Control Inputs - Ensure control inputs are enabled
Object 20 binary counters
Object 20, binary counters, contains cumulative counters and measurements. The binary
counters can be read as their present ‘running’ v
functions. The freeze f
stores it in the corresponding object 21 frozen counter. The freeze and clear function resets
the object 20 running counter to zero after freezing its value.
t 30 anal
bject 30, analog in
All object 30
ontains info
are reporte
n from the relay’s measurements co
-point values although they are store
oint format. The co
iffers for the various t
ersion to fixed-point format require
pes of data within caling factor
hase a data types supp
pe allocated a ‘D n
ed are listed
ber’, i.e. D1, D2, et
ach data poi
efault deadband D number data typ
ting and the range
assigned to it which defines the scaling factor,
nd resolution of the deadband setting.
each point. The change
for any point whose value has changed by more than the deadband setting since the last
time the data value was reported.
Any analog measurement that is unavailable at the time it is read will be reported as offline,
e.g. the frequency when the current and voltage frequency is outside the tracking range of
the relay or the thermal state when the thermal protection is disabled in the configuration
column. Note that all object 30 points are reported as secondary values in DNP3.0 (with
respect to CT and VT ratios).
3.7 DNP3.0 configuration using MiCOM S
A PC support package for DNP3.0 is available as part of the settings and records module of
MiCOM S1. The S1 module allows configuration of the relay’s DNP3.0 response. The PC is
connected to the relay via a serial cable to the 9-pin front part of the relay – see Introduction
(P846/EN IT). The configuration data is uploaded from the relay to the PC in a block of
compressed format data and downloaded to the relay in a similar manner after modification.
The new DNP3.0 configuration takes effect in the relay after the download is complete. The
default configuration can be restored at any time by choosing ‘All Settings’ from the ‘Restore
Defaults’ cell in the menu ‘Configuration’ column. In S1, the DNP3.0 data is displayed on a
three-tabbed screen, one screen each for object 1, 20 and 30. O