MR ETOS ED - Torque Monitoring (Optional); Tap-Change Ranges (Windows) M1; Types of Tap-Change Operations

9 Visualization
Maschinenfabrik Reinhausen GmbH 2020306 6385142/08 ENETOS
®
ED
9.32 Torque monitoring (optional)
The torque monitoring function is used to monitor the torque of the on-load
tap-changer. For the torque, different limit values are defined across the en-
tire tap-change sequence and, if exceeded, the monitoring system triggers a
corresponding event message.
You can use torque monitoring only for the on-load tap-changer calibrated
ex works and the motor-drive unit. Contact Maschinenfabrik Reinhausen
GmbH if you want to perform torque monitoring for another on-load tap-
changer.
9.32.1 Tap-change ranges (windows) M1...M8
The torque curve is divided into as many as 8 ranges, or windows, depend-
ing on the on-load tap-changer and tap-change operation type (M1...M8).
These ranges describe the individual tap changes that the on-load tap-
changer passes through during a tap-change process.
Figure233: Torque curve of a change-over selector operation divided into 8 tap-change ranges
(M1...M8)
9.32.2 Types of tap-change operations
The monitoring system distinguishes between the following types of tap-
change operations:
▪ Change-over selector operation: The change-over selector also changes
in this tap-change operation.
▪ Small tap change: Tap selector operation in which the distance between
the stationary selector contacts used for this tap-change operation is
small.
▪ Moderate tap change: Tap selector operation in which the distance be-
tween the attached selector contacts used for this tap-change operation is
moderate.