7SG15 MicroTAPP Description of Operation
©2013 Siemens Protection Devices Limited Chapter 1 Page 31 of 38
Block Raise Command The relay is blocking Raise operations.
Can be used to block Raise commands
initiated externally to Relay.
Block Lower Command The relay is blocking Lower operations.
Can be used to block Lower commands
initiated externally to Relay.
VT Fuse Blown
A VT / VT Fuse failure has been detected. Alarm after Alarm Time
setting
Remote VT fuse blown Indicates that a VT / VT Fuse failure has
been reported by one of the other
MicroTAPP’s connected on the MPPC.
Instantaneous Alarm
Tap-change Reset Lockout has been reset at relay.
[102] Dead Reckoning Block Dead Reckoned and Measured Tap Positions
are out of alignment. Tapping is blocked.
MPPC Failure Failure Detected in Peer-to-Peer
Communications.
Instantaneous Alarm
End of Tap Range Indicates the Tap Position is at one of the
extremes of its range.
Instantaneous Alarm
Tap not achievable Indicates the Voltage is currently outside the
Dead-band but the Relay can no longer
compensate because it is already at the end
of its Tap Range.
Instantaneous Alarm
[102] Voltage Target
Acknowledge
Step change to Target Voltage completed.
Group 1 Selected Indicates Settings Group 1 is currently Active.
Group 2 Selected Indicates Settings Group 2 is currently Active.
Group 3 Selected Indicates Settings Group 3 is currently Active.
Group 4 Selected Indicates Settings Group 4 is currently Active.
Group 5 Selected Indicates Settings Group 5 is currently Active.
Group 6 Selected Indicates Settings Group 6 is currently Active.
Group 7 Selected Indicates Settings Group 7 is currently Active.
Group 8 Selected Indicates Settings Group 8 is currently Active.
Any functional output can be allocated to any output relay. If more than one output is mapped to the same output
relay, the status of the individual outputs are OR-ed together to obtain the overall status of the output relay.
With no outputs active, the number of output relays available for allocation is shown in the instruments as;
_ _ _ _ _
indicating that 5 output relays are available; RL1, 2, 3, 4 and 5.
If any output relays are active, these will be indicated in the instruments by a ‘1’. For example, if output relays 2
and 4 are active, the display will show;
RL2, 4 _ 1 _ 1 _
Functional Inputs (mapable to hardware Status Inputs)
Inverted Inputs Specify which inputs are to be inverted.
MicroTAPP Enable Input must be active for Relay to control voltage.
Can be used to disable Relay if Tap Changer is to be controlled by
alternative control systems - normally via a Local/Remote selector
switch located at the Tap Changer mechanism.
Raise from Tap Changer Raise Command from alternative control system - normally the Tap-
Changer.
Lower from Tap Changer Lower Command from alternative control system - normally the Tap-
Changer.
Tap In Progress TIP signal from Tap-Changer.
Tap Raise Block Temporarily inhibit Tap Raise operations.
Tap Lower Block Temporarily inhibit Tap Lower operations.
Prepare for Switch Out Initiate Switch-out sequence. If the Transformer is not switched out
within 5 minutes, the Relay(s) will revert to normal operation.
Tap Stagger Biases the voltage control setting to allow the required reactive load to
be imported or exported.
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