7SG15 MicroTAPP Description of Operation
©2013 Siemens Protection Devices Limited Chapter 1 Page 33 of 38
Clear Delta Tap-change count Resets the maintenance count.
Clear Delta Sum of I
2
count Resets the maintenance total.
9.2 Instruments
A comprehensive set of readings are available from the relay. These are accessed as shown in Figure 19 and
display: -
System Values Line Voltage, Load and Power Factor.
Voltages Analogue Voltage levels – the values shown depend upon the connection
method.
Loads Transformer and Group Load.
Secondary Values Analogue Voltage and Current levels – the values shown depend upon
the connection method. Phase relationships shown relative to the
Measured Voltage.
Frequency Frequency of the Measured Voltage.
Phase Sequence NPS and PPS values for secondary Voltage.
Tap-Changer Status
Digital I/O Status
Data Storage Number of Events.
Tap Counter Tap-Changer Maintenance values.
MPPC Peer-to-Peer Communications status
9.3 Fault Data
The fault data mode is accessed as shown in Figure 19. When a fault occurs the MicroTAPP displays this screen
automatically and when appropriate inhibits tap change operation.
This screen allows the 10 most recent tap-changer faults to be viewed. For each fault the date and time with a
short description of the events leading to the fault is provided.
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