480 SIML.TmpAlm

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This tissue has following status: green

Proposer: Jochen Haude , RWE

Page: 58

Clause: 5.11.4

Paragraph:

Category: Issue for edition 2 of this part

Issue: In Tissue 92 it is proposed to delete SIML.TmpAlm in comparison to SIMG.TmpAlm. But this comparison is wrong. In a gas insulation the density is of interest, and this is physically related to the temperature and the pressure - so Tissue No 91 is ok. But there is not such a realtion in liquids ! In a power transformer, the temperature alarm is a widely used and one of the most important information. A lot of power transformers are even equipped with two redundant mechanical temperature sensors, so we need in practice two instances: SIML.TmpAlm1 and SIML.TmpAlm2

Proposal: I strongly recommend to keep TmpAlm in SIML

Discussion	Created	Status ?	Ballot until	Editor
	09 May 07	green		Siemens AG Henry Dawidczak
	10 Apr 07	final proposal	09 May 07	Siemens AG Henry Dawidczak
	23 Mar 07	red		Siemens AG Henry Dawidczak
Accepted since an insulation liquid like oil performes two tasks: (1) It insulates which is described by SIML.Ins.xyz (2) It may cool parts like the winding of the transformer which needs a separate description by SIML.Tmp.xyz	23 Mar 07	red		ABB Klaus-Peter Brand