7.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Hot-spot and insulation ageing rate
monitoring for transformers
HSARSPTR
3Ihp>T
26/49HS
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
Description
I3P
Three-phase currents
See the preprocessing function blocks in this document for the possible
signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
1MRS759142 F
Condition monitoring functions
REX640
Technical Manual
1383