International Standards and Conformity Assessment for all electrical, electronic and related technologies

TC 10

Fluids for electrotechnical applications

 

Detail

Committee
Working Groups
Project Leader

Current

Status

Frcst Pub

Date

Stability

Date

TC 10Mr Shubhen KapilaPPUB2018-032024

History

Stage
Document
Downloads
Decision Date
Target Date
PWI
2017-02-01 
preDTR
2017-02-01 
TDTR
2017-02-01 
CDTR
10/1013/DTR
2017-02-172017-03
PRVDTR
2017-04-142017-04
APUB
10/1027/RVDTR PDF file 453 kB
2017-08-252017-10
TPUB
2017-11-172017-10
DECPUB
2017-11-202018-01
RPUB
2017-12-052017-12
BPUB
2018-01-292018-02
PPUB
2018-02-142018-03
  

Abstract

IEC TR 62697-2:2018(E) specifies a test method for the quantitative determination of total corrosive sulfur (TCS) in unused and used insulating liquids and solid matrices through the conversion of corrosive sulfur species to metal (copper, silver etc.) sulfides. The sulfides formed are quantitatively converted to sulfates; sulfates are determined through turbidity measurement or with ion chromatography.
The method is applicable with the following matrices:
a) Unused and used insulating liquids, for example mineral insulating oils and natural esters, which allow the determination of corrosive sulfur compounds over concentrations ranging between 2,5 mg kg-1 to 80 mg kg-1 TCS.
b) Solid matrices that come in contact with the insulating liquid, for example insulating papers in electrical equipment. The quantification limits for these matrices depend on the amount of matrix used during the determination. The method can be used for the quantitative or semi-quantitative determination of copper sulfide on paper after the test according to IEC 62535. The method can provide unambiguous quantitative assessment of copper sulfide present on paper rather than qualitative results obtained with the SEM-EDX examination stipulated in case of doubts in the interpretation of results obtained from the inspection of paper according to IEC 62535:2008, 6.3.
c) Paper and other solid insulating material/s obtained from failed transformers, reactors and other electrical equipment to assist in failure diagnostics.
d) Metal deactivator or passivators additives present in insulating liquids (qualitative assessment).
However, the method is not applicable for assessing corrosion phenomena for example the dissolution of copper in insulating liquids and deposition on solid matrices, which do not lead to sulfide formation.

Project

IEC TR 62697-2:2018 ED1

Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Part 2: Test method for quantitative determination of total corrosive sulfur (TCS)