480   SIML.TmpAlm

Created: 08 Mar 2007

Status: In Force (green)

Part: Part 7-4 (2003)


Page: 58

Clause: 5.11.4


Category: Issue for edition 2 of this part


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


I strongly recommend to keep TmpAlm in SIML

Discussion Created Status
09 May 07 In Force (green)
10 Apr 07 Ballot Period
23 Mar 07 Discussion (red)
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 Discussion (red)


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