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IEEE 522
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IEEE 522 2004 Edition, February 9, 2004 Guide for Testing Turn Insulation of Form-Wound Stator Coils for Alternating-Current Electric Machines
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Description / Abstract:
This guide makes suggestions for testing the dielectric strength
of the insulation separating the various turns from each other
within multiturn form-wound coils to determine the acceptability of
the coils. Typical ratings of machines employing such coils
normally lie within the range of 200 kW to 100 mW (270 to 135 000
hp). Test voltage levels described herein do not evaluate the
ability of the turn insulation to withstand abnormal voltage
surges, as contrasted to surges associated with normal operation.
The repetitive voltage surges (spikes) associated with adjustable
frequency drives (AFD) are also not addressed here. This guide
applies to
a) Individual stator coils after manufacture.
b) Coils in completely wound stators of original manufacture.
c) Coils and windings for rewinds of used machinery.
d) Windings of machines in service to determine their suitability for further service (preventivemaintenance testing).
Purpose
The purpose of this guide is to
a) Define surge/impulse testing as applied to the windings of an electric machine.
b) Review the service conditions that affect voltage levels in a coil.
c) Recommend devices suitable for measuring surges, with precautions to avoid erroneous results.
d) Describe various points where surge testing may be performed.
e) Present suggested surge test levels for various types of electric machines.
a) Individual stator coils after manufacture.
b) Coils in completely wound stators of original manufacture.
c) Coils and windings for rewinds of used machinery.
d) Windings of machines in service to determine their suitability for further service (preventivemaintenance testing).
Purpose
The purpose of this guide is to
a) Define surge/impulse testing as applied to the windings of an electric machine.
b) Review the service conditions that affect voltage levels in a coil.
c) Recommend devices suitable for measuring surges, with precautions to avoid erroneous results.
d) Describe various points where surge testing may be performed.
e) Present suggested surge test levels for various types of electric machines.