7 Operation
Maschinenfabrik Reinhausen GmbH 2019
246
5163667/06 EN
ETOS
®
IM
The device uses the following limit values in accordance with your selection:
Option
Calculation method
Limit values
K
θ
h
θ
o
L
Medium power
(S < 100 MVA)
IEC 60076-7
1.8
160 °C
115 °C
No limit
IEEE Std C57.91
2.0
180 °C
110 °C
High power
(S > 100 MVA)
IEC 60076-7
1.5
160 °C
115 °C
IEEE Std C57.91
2.0
180 °C
110 °C
Customer-specific
IEC 60076-7
Freely configurable
IEEE Std C57.91
Table 64: Limit values for short-term overload
K = load factor
θ
h
= hot-spot temperature
θ
o
= top-oil temperature
L = loss-of-life per day in %
Option
Calculation method
Limit values
K
θ
h
θ
o
L
Medium power
(S < 100 MVA)
IEC 60076-7
1.5
140 °C
115 °C
5%
IEEE Std C57.91
2.0
140 °C
110 °C
High power
(S > 100 MVA)
IEC 60076-7
1.3
140 °C
115 °C
IEEE Std C57.91
2.0
140 °C
110 °C
Customer-specific
IEC 60076-7
Freely configurable
IEEE Std C57.91
Table 65: Limit values for long-term overload
K = load factor
θ
h
= hot-spot temperature
θ
o
= top-oil temperature
L = loss-of-life per day in %
Note the following limitations for the freely configurable limit values:
θ
h
: min. 140 °C (K > 1), max. 180 °C (risk of bubbling)
θ
o
: min. 110 °C (K > 1), max. 120 °C (should be less than the hot-spot tem-
perature)
To select the used limits, proceed as follows:
1. Go to
Settings > Parameters > Overload > Used limits
.
2. Select the desired option.
3. Press the
Accept
button to save the modified parameter.
Summary of Contents for ETOS IM
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