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The value of 0 during an unexpected interruption of the auxiliary voltage represents a special case. An invalid
tap-changer position without a corresponding adjusting command is signaled only as an invalid tap position in
the Position controllable.
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Figure 8-91
Supervision Behavior
Depending on the setting of the Supervision behavior parameter, the function reaches a health state of
Alarm or Warning. You can set the Supervision behavior parameter to off, alarm block, or
warning.
In the alarm block mode, the function is set to the health state Alarm. All tap-changer commands are
blocked.
In the warning mode, the function is set to the health state Warning. Executing tap-changer commands is
still possible.
You can reset the health state of alarm block or warning manually using the controllable Reset
errors (Main menu → Device functions → Reset functions →Tap changer). As an alternative to this, you can
also switch off the supervision function and then switch it on again.
Operating Meter
The device counts the number of successfully completed adjusting commands with the
cycle metered value. The meter and memory levels are protected against an auxiliary-voltage failure. The
switching cycle metered value can be preconfigured to 0 or to any other starting value.
You can access the statistical values via the operation panel on the device (measured values/statistics), via
DIGSI, or using various communication protocols.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Position and Motor Supervision Logic
Control Functions
8.8 Transformer Tap Changers
Op.ct. switching
1185
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