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ABB Life Expectancy Analysis Program(ABB LEAP)for stator windings of high voltagerotating machines

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ABB LEAP facilitates the managementof machine maintenance

ABB LEAP is much more than just a package of inspections: it is a systematic approachto maintenance management.

The materials and components of electrical machines are

subject to thermal, electrical, ambient and mechanical stresses.

This leads to a process of degradation as materials lose

strength over time (blue curve).

Operating stresses both steady state and transient are also

present (red curve). At the point where the two curves cross,failure becomes imminent.

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.

02 | ABB Life Expectancy Analysis Program (ABB LEAP)

Strength

Stress

Premature

failure

Failure

Time

Confidencelevel

Basic

90

75

60

45

30

15

0Standard Advanced Premium

Analysis is performed at four levels depending on the opportunities

for data collection over the machines lifetime.

ABB LEAP levels

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Partial Discharge Pattern

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 LEAP offers real benefits

ABB Li fe Expectancy Analys is Progr am (ABB LEAP) |03

Strength

Stress

Premature

failure

Failure

Time

Time (sec)Pol-DepolCurrents(m

icroAmp)

Polarization-Depolarization Currents UVW PHASE

1 10 100 1000

100

10

1

0,1

0,01

Time (msecs)

CAPACITANCE(Arbitrary

Units)

Instantaneous Capacitance Variations @ 8 kV

40 42 44 46 48 50 52 54 56 58 60

120

100

8060

40

20

0

-20

-40

-60

-80

U - Phase V - Phase W - Phase UVW - Phase

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.

60 120 180

Phase ()

Amplitude(C)

Counts

240 300 3601

10

100

1107

0

0.0

500p

1.0n

1.5n

2.0n

2.5n

3.0n

3.5n

4.0n

4.5n

5.0n5.2n

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Copyright 2010 ABB. All Rights ReservedWe reserve the right to make technicalchanges or modify the contents of thisdocument without prior notice.No part of this publication may be reproducedor transmitted in any form or by means,electronic, mechanical, photocopying,recording or otherwise without prior writtenpermission of ABB.

ABBL

EAP

brochureENR

evB2

010

Contact us

www.abb.com/motors&generators

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