Table of Contents

Siemens / Hotspot calculation (ANSI 49H) _ Setting & highlights _ SI5083

Table of Contents

Overview

The “Hot spot calculation” function protects the transformer against thermal destruction at increased operating currents and monitors the thermal state of the turns. The main use of this function is monitoring the temperature of the turns in the transformer.

For more detailed information on “Hot spot calculation” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.

To see other supported functions, click here.


Structure/Embedding of the Function

Structure/Embedding of the Function

Setting Parameters


Setting parameters for Hotspot calculation function

Addr. Parameter C Setting Options Default Setting
General
_:13531:1 Hotspot calc.:Mode   off
on
test
off
_:13531:2 Hotspot calc.:Operate & flt.rec. blocked   no
yes
no
_:13531:100 Hotspot calc.:Consistency failure   no MP configured
no Sensor configured
no Sensor configured
_:13531:150 Hotspot calc.:Cooling Method   ONAN Oil nat.&Air nat.
ONAF Oil nat.&Air for.
OF Oil forced
OD Oil directed
ONAN Oil
nat.&Air nat.
_:13531:112 Hotspot calc.:Emerg. start T overtravel   0 s to 15 000 s 300 s
_:13531:103 Hotspot calc.:HST Warning Threshold   80°C to 140°C 98°C
_:13531:104 Hotspot calc.:HST Alarm Threshold   80°C to 140°C 108°C
_:13531:105 Hotspot calc.:Aging Warning Threshold   0.125 to 128.000 1.000
_:13531:106 Hotspot calc.:Aging Alarm Threshold   0.125 to 128.000 2.000
_:13531:116 Hotspot calc.:Turn time constant   0 min to 30 min 10 min
_:13531:153 Hotspot calc.:Calculation method   IEC 60076-7
IEEE C57.91 2011
IEC 60076-7
IEC 60076-7
_:13531:101 Hotspot calc.:y Turn expo- nent   1.6 to 2.0 1.6
_:13531:102 Hotspot calc.:Temperature gradient   20 to 50 22
_:13531:113 Hotspot calc.:Factor k21   1.0 to 5.0 2.0
_:13531:114 Hotspot calc.:Factor k22   1.0 to 5.0 2.0
_:13531:115 Hotspot calc.:Oil time constant   50 min to 500 min 210 min
IEEE C57.91 2011
_:13531:110 Hotspot calc.:m Turn expo- nent   0.8 to 1.0 0.8
_:13531:130 Hotspot calc.:Temperature gradient   20 to 50 22

Logic Diagrams & highlights


Logic Diagram of the Hotspot Calculation Function

Logic Diagram of the Hotspot Calculation Function

cooling methods

cooling methods

Calculating the Hotspot Temperature According to IEC 60076-7

Calculating the Hotspot Temperature According to IEC 60076-7

Calculating the Hotspot Temperature According to IEEE C57.91 2011

Calculating the Hotspot Temperature According to IEEE C57.91 2011

Example of a Hotspot Calculation

Example of a Hotspot Calculation

Calculation of the Relative Aging

Calculation of the Relative Aging

Thermal Data of Transformers

Thermal Data of Transformers

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