ABB RELION REX640 Technical Manual page 1383

1MRS759142 F
7.3.1 Identification
Function description
Hot-spot and insulation ageing rate
monitoring for transformers
7.3.2 Function block
Figure 788: Function block
7.3.3 Functionality
The hot-spot and insulation ageing rate monitoring for transformers function
HSARSPTR is used for online monitoring of transformers. The function monitors
the hot-spot temperature of the transformer winding and the ageing rate of
the insulation caused by thermal stress. The function can be applied for new
transformers as well as for transformers already in service.
The hot-spot temperature and loss of life of transformer are calculated for one
winding of the transformer from three phase currents and RTD inputs for top oil
temperature and ambient temperature.
The hot-spot temperature and the momentary ageing rate are calculated based on
the IEC 60076-7 or the IEEE C57.91-2011 standard, depending upon a user defined
setting. The total ageing and loss of transformer insulation life is calculated in
years.
The function generates WARNING and ALARM signals if the calculated hot-spot
temperature exceeds the set value.
7.3.4 Analog channel configuration
HSARSPTR has one analog group input which must be properly configured.
Table 1322: Analog signals
Input
I3P
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
REX640
Technical Manual
See the preprocessing function blocks in this document for the possible
signal sources.
Condition monitoring functions
IEC 61850 IEC 60617
identification identification
HSARSPTR 3Ihp>T
Description
Three-phase currents
ANSI/IEEE C37.2
device number
26/49HS
1383