Page 250 - Industrial Power Engineering and Applications Handbook

Winding insulation and its maintenance 9/229
:vote,\
I In the tables of relevant Standards in this hook while the latest editions of the standards are provided, it is possible that revised editions
have become available. With the advances of technology and/or its application, the updating of standards is a continuous process by
dilferent standards organizations. It is therefore advisable that for more authentic I-efei-cnces. readers \trould consult the relevant
crsanizations for the latest version of a standard.
2 Sonic of the BS or IS htandards mentioned against IEC may not be identical.
3 The year noted against each standard may also refer to the year of its last amendment and not necessarily the )ear of publication.
List of formulae used Further reading

Making-up of insulation level in large machines: I. Anddo Cornpuneriti SPA. Italy. Pvo,qre.\.\ arid rln,c.lopnzenr
Insulation resistance rwds it1 the large induction motor s tiitor vt.indirig inxrt/cirion.
2. Hogg, W.K.. Miller, R., Rahach, G. and Ryder D.M. 'The
relationshipofpartial discharge amplitude distri hution with electric
R,,, = kV + I (9.1 ) damage at different levels of voltage and frequency'. IEEE
Sjmposiurn oil Electrical Insularion. USA. June 1984.
R,,, = recommended minimum insulation resistance in 3. Lee-Neville., and Simons J.S., Handbook of Epo.k-) Rr.\tn\.
McGraw-Hill, New York ( 1967).
MR of the entire machine windings, at 40°C 3. Meyer. H.. 'Post impregnatedmicalastic insulation for large motor\
kV = rated machine voltage in kV. and generators.' Siemens Rn.irw. XLV April, No. 4 ( 1978).
5. Moses,G.L.. Elec/riu/lrisu/u/ion, McGraw-HillNewYork( 1051 ).
6. Moses, G.L., 'Alternating and direct voltage endurance studie\
on mica insulation for electric machinery.' AIEE Tr~fn.ctrc.tio,l.s.
70,763-769 ( I95 1 ),
RJo = insulation resistance in MQ corrected to 40°C 7. Renganian. S., Agrawal, M.D. and Nema R.S., 'Behaviour of
R, = test insulation resistance in MQ at t "C and high voltage machine inwlation system in the preqence ofthermal
K,,,, = temperature coefficient of insulation resistance at and electrical stresses,'IEEE Trms. 017 €1.. E.I.. 20. No.1. Feh.
t "C (1985).
8. Rhudy. R.G. ct al.. 'Impulse ioltage strength of AC rotating
machines.' IEEE Tram.. 100, No. 8 (1 98 I ).
Test voltage in volts 9. Simons, J.S., 'Diagnosis 01' H.V. machine insulation.' /€€E
R1'l = Leakage current in PA MR (9.3) Procredrng.5. 127. May (1980).