7 Operation
Maschinenfabrik Reinhausen GmbH 2019 2155163667/06 EN ETOS
®
IM
F1/F2 Limit values C: ΔC1 > and C: ΔC1 >>
You can set two limit values for monitoring the bushings in field 1 and field 2:
▪ F1/F2-C: ΔC1 >
▪ F1/F2-C: ΔC1 >>
If the limit values are exceeded, the monitoring system triggers an event
message and issues a signal at the digital output.
Maschinenfabrik Reinhausen recommends the following limit values: F1/F2-
C: ΔC1 >: 5%, F1/F2-C: ΔC1 >>: 10%
To set the limit values F1/F2-C: ΔC1 > and F1/F2-C: ΔC1 >>, proceed as fol-
lows:
1. Go to Settings > Parameters > Bushing monitoring field1/field2 > F1/
F2-C: ΔC1 >/ F1/F2-C: ΔC1 >>.
2. Enter the desired value.
3. Press the Accept button to save the modified parameter.
F1/F2-C: Perform standardization
You must perform standardization for field 1 and field 2 to commission the
monitoring system. The standardization is used to compensate for measure-
ment tolerances along the measurement chain (bushing, bushing adapter
and bushing coupling unit).
Only perform the standardization while commissioning the monitoring sys-
tem and with bushings in good condition. Otherwise correct bushing moni-
toring functionality cannot be guaranteed.
To perform the standardization, proceed as follows:
ü The transformer is in a stable state (no on-load tap-change operation or
significant change in the transformer load).
1. Go to Settings > Parameters > Bushing monitoring field1/field2 > F1/
F2-C: Perform standardization.
2. Select the Yes option.
3. Press the Accept button to perform the standardization.
ð The standardization is carried out and the parameter is reset to the No
option.
4. Check the event messages [►Section 7.22.1, Page 253] to see if the
standardization was performed successfully. If this is not the case, resolve
the cause of the error and repeat the standardization.
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