IEC TS 60034-34:2020

IEC TS 60034-34 ®
Edition 1.0 2020-11
TECHNICAL
SPECIFICATION
colour
inside
Rotating electrical machines –
Part 34: AC adjustable speed rolling mill motors

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IEC TS 60034-34 ®
Edition 1.0 2020-11
TECHNICAL
SPECIFICATION
colour
inside
Rotating electrical machines –

Part 34: AC adjustable speed rolling mill motors

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.160.01 ISBN 978-2-8322-9046-0

– 2 – IEC TS 60034-34:2020 © IEC 2020
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
3.1 Terms and definitions . 9
3.2 Terms and definitions for adjustable speed control and rolling operation . 13
3.3 Terms and definitions for adjustable speed drive system . 14
3.4 Terms and definitions for monitoring and protection sequence . 15
3.5 Terms and definitions for motor installation and site trial operation . 15
3.6 Terms and definitions for test . 16
4 Terminal voltage determination . 17
5 Duty type and temperature class . 19
5.1 General . 19
5.2 Selection of rolling operation pattern . 19
5.3 Evaluation of winding temperature deviation during one rolling cycle . 20
5.4 Duty type S1 or S9 selection . 20
5.5 Class B rise or Class F rise selection . 21
5.6 Overload current duration time limit based on winding temperature deviation
in one rolling cycle for RMS current of 100 % . 21
6 Continuous overload capability . 22
6.1 General . 22
6.2 Relative thermal life index of TL value estimation by simplified method . 23
6.3 Relative thermal life estimation by precise method . 24
6.4 Relative thermal life index of TL value determination by precise method . 25
7 Mechanical requirements . 25
7.1 General . 25
7.2 Mechanical strength for shaft and other transmission parts considering
torsional vibration . 25
7.3 Vibration transmitted through the motor base . 25
7.4 Tangential forces applied to rotor and stator . 25
7.5 Thrust load . 25
7.5.1 General . 25
7.5.2 Frequently applied thrust load . 25
7.5.3 Occasionally applied maximum thrust load . 26
7.5.4 Emergency maximum thrust load . 26
7.6 Radial load for bearings . 26
7.7 Overspeed . 26
7.8 Stator coil end fixation . 26
7.9 Stator shift construction for maintenance inspection. 26
7.10 Mounting code application . 26
8 Withstand voltage capability . 26
8.1 Rotor bars or damper bars and short-circuit rings . 26
8.2 General . 27
8.3 Withstand voltage test . 27
8.4 Withstand voltage capability . 27

8.4.1 General . 27
8.4.2 Ground insulation . 27
8.4.3 Turn-to-turn insulation . 29
9 Factory tests and recommended site operation tests . 29
9.1 General . 29
9.1.1 General scope for the tests . 29
9.1.2 Requirements of the site operation test where vector control is applied . 29
9.2 Factory test . 30
9.3 Preparation before trial operation at site . 30
9.3.1 General . 30
9.3.2 Calibration of feedback signals for the converter . 31
9.3.3 Insulation resistance tests for motor . 31
9.3.4 Insulation resistance tests for bearings . 31
9.3.5 Performance test for bearing lubrication oil supply unit . 31
9.3.6 Confirmation of lubrication oil surface level for bearings . 31
9.3.7 Performance test for cooling systems . 31
9.3.8 Confirmation of alarm issue levels for motor protection . 31
9.3.9 Synchronous motor pole position confirmation test . 32
9.4 Site uncoupled trial operation . 32
9.4.1 General . 32
9.4.2 Rotational speed build-up test . 32
9.4.3 Bearing temperature rise test . 32
9.5 Site no-load characteristic test . 32
9.5.1 Induction motor no-load characteristics test . 32
9.5.2 Synchronous motor no-load characteristics test . 33
9.5.3 No-load characteristics test record. 33
9.6 Site acceleration and deceleration test . 33
10 Grounding . 34
10.1 General . 34
10.2 Protection against bearing currents . 34
10.3 Protective earthing (PE) . 34
10.4 Functional earthing (FE) . 34
11 Rating plate . 35
Annex A (normative) Short-time overload capability . 36
A.1 General . 36
A.2 Frequently applied Art-1 short-time overload capability specification . 36
A.3 Frequently applied Art-2 short-time overload capability specification . 39
Annex B (normative) Rolling operation pattern designation . 42
B.1 General . 42
B.2 Rolling operation pattern for hot reversing rolling . 42
B.3 Rolling operation pattern for hot continuous rolling of sheet strip . 43
B.4 Rolling operation pattern for continuous caster directly connected hot
continuous rolling mills . 44
B.5 Rolling operation pattern for hot continuous rolling for wire and rod mills . 45
B.6 Rolling operation pattern for cold reversing rolling mills . 46
B.7 Rolling operation pattern for cold continuous rolling . 47
B.8 Operation pattern for coilers and reels . 48
Annex C (informative) Determination of winding temperature deviation in one rolling
cycle . 50

– 4 – IEC TS 60034-34:2020 © IEC 2020
C.1 General . 50
C.2 Simplified method for estimation of the winding temperature deviation
between maximum and mean values in one rolling cycle . 50
C.3 Precise method for estimation of the winding temperature deviation between
maximum and mean in one rolling cycle .
...