Object 40 Analogue Output; Object 50 Time Synchronisation; Configuration - GE MiCOM P747 Agile Technical Manual

MiCOM P747
Analogue values can be reported to the master station as primary, secondary or normalized values (which
takes into account the IED's CT and VT ratios), and this is settable in the COMMUNICATIONS column in the
IED. Corresponding deadband settings can be displayed in terms of a primary, secondary or normalized
value. Deadband point values can be reported and written using Object 34 variations.
The deadband is the setting used to determine whether a change event should be generated for each point.
The change events can be read using Object 32 or Object 60. These events are generated for any point
which has a value changed by more than the deadband setting since the last time the data value was
reported.
Any analogue measurement that is unavailable when it is read is reported as offline. For example, the
frequency would be offline if the current and voltage frequency is outside the tracking range of the IED. All
Object 30 points are reported as secondary values in DNP 3.0 (with respect to CT and VT ratios).
8.6

OBJECT 40 ANALOGUE OUTPUT

The conversion to fixed-point format requires the use of a scaling factor, which is configurable for the various
types of data within the IED such as current, voltage, and phase angle. All Object 40 points report the integer
scaling values and Object 41 is available to configure integer scaling quantities.
8.7

OBJECT 50 TIME SYNCHRONISATION

Function codes 1 (read) and 2 (write) are supported for Object 50 (time and date) variation 1. The DNP Need
Time function (the duration of time waited before requesting another time sync from the master) is
supported, and is configurable in the range 1 - 30 minutes.
If the clock is being synchronized using the IRIG-B input then it will not be possible to set the device time
using the Courier interface. An attempt to set the time using the interface will cause the device to create an
event with the current date and time taken from the IRIG-B synchronized internal clock.
8.8

CONFIGURATION

To configure the IED for this protocol, please see the
P747-TM-EN-1
P747-TM-EN-1.1
Chapter 7 - SCADA Communications
Configuration (on page 55) chapter.
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