Brochure

1. ABB Life Expectancy Analysis Program
(ABB LEAP)
for stator windings of high voltage
rotating machines
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2. ABB LEAP facilitates the management
of machine maintenance
ABB LEAP is much more than just a package of inspections: it is a systematic approach
to maintenance management.
The materials and components of electrical machines are
subject to thermal, electrical, ambient and mechanical stresses. Strength
This leads to a process of degradation as materials lose Premature
strength over time (blue curve). failure
Failure
Operating stresses – both steady state and transient – are also
present (red curve). At the point where the two curves cross, Stress
failure becomes imminent.
Time
ABB LEAP provides the information needed for timely action to
re-position the red and blue curves.
Appropriate maintenance can help to re-draw the red, and
possibly even the blue curve, preventing premature failure
and extending the life of the machine.
What makes ABB LEAP special is its ability to track the development of defects over time.
As a result ABB LEAP can be directly integrated into a maintenance plan.
90
Analysis is performed at four levels depending on the opportunities
75
for data collection over the machine’s lifetime.
Confidence level
60
45
30
15
0
Basic Standard Advanced Premium
ABB LEAP levels
02 | ABB Life Expectancy Analysis Program (ABB LEAP)
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3. ABB LEAP offers real benefits
– Optimizes maintenance planning for electrical machines
– Supports efforts to extend machine lifetime, boosting Return On Investment
– Facilitates decision making for long and short term maintenance and run-replace decisions, even when data can only be collected once
– Minimizes downtime at lower risk levels
– Provides inputs for life cycle cost estimation
ABB offers a package of DC (PDCA) and AC (Non-Linear Insulation Behaviour, Partial Discharge and Tan Delta & Capacitance Analysis)
measurements, to assess the condition of the stator winding.
Polarization-Depolarization Currents UVW PHASE
Pol-Depol Currents (microAmp)
100
10
1
0,1
0,01
1 10 100 1000
Time (sec)
Instantaneous Capacitance Variations @ 8 kV
120
CAPACITANCE (Arbitrary Units)
100
80 Strength
Premature
60
failure
40
Failure
20
0
Stress
-20
-40
Time
-60
-80
40 42 44 46 48 50 52 54 56 58 60
Time (msecs)
U - Phase V - Phase W - Phase UVW - Phase
Partial Discharge Pattern
5.2n 1107
5.0n
4.5n
4.0n
3.5n
Amplitude (C)
100
Counts
3.0n
2.5n
2.0n
10
1.5n
1.0n
500p
0.0 1
0 60 120 180 240 300 360
Phase ( )
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4. Contact us
www.abb.com/motors&generators © Copyright 2010 ABB. All Rights Reserved
We reserve the right to make technical
changes or modify the contents of this
document without prior notice.
No part of this publication may be reproduced
or transmitted in any form or by means,
electronic, mechanical, photocopying,
recording or otherwise without prior written
ABB LEAP brochure EN Rev B 2010
permission of ABB.
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