481   SIML.TmpAlm

Created: 08 Mar 2007

Status: Not Applicable

Part: Part 7-4 (2003)

Links:

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