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

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

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