Page 5 - EASA_AR100-2020 APEX_IESCO_Neat

EASA AR100-2020 Recommended Practice - Rev. August 2020 Section 1, Page 1

Section 1
General

1.1 PURPOSE and a new nameplate mounted adjacent to it with
The purpose of this document is to establish the word “redesigned” and the new rating and date
recommended practices in each step of the rotat- of redesign shown. The original nameplate may be
ing electrical apparatus rewinding and rebuilding reversed (blank side out) to prevent misinterpreta-
processes. tion, but it should remain with the frame.
1.2 SCOPE 1.4 CONDITION ASSESSMENT AND
This document describes record keeping, tests, FAILURE INVESTIGATION
analysis, and general guidelines for the repair of The service center should inspect and test the ap-
induction, synchronous and direct current rotat- paratus when received to confirm its condition and
ing electrical apparatus. It is not intended to take obtain data for any failure investigation. Initial data
the place of the customer’s or the machine manu- collection should proceed before any work is car-
facturer’s specific instructions or specifications or ried out. Inspect all parts for defects before and after
specific accepted and applicable industry standards cleaning. Document any evidence of distress, such
or recommended practices. as physical damage, overheating, tampering, inap-
This document should be supplemented by addi- propriate lubrication, electrical tracking, or foreign
tional requirements applicable to specialized rotating object damage. If possible, obtain information about
electrical apparatus including, but not limited to, operating conditions at the time of failure. Collect
listed explosion proof, dust-ignition proof, and and carefully examine any debris from any fault.
other listed machines for hazardous locations; and The primary cause of failure should be determined,
specific or additional requirements for hermetic mo- if practical, and documented in the repair record.
tors, hydrogen-cooled machines, submersible motors, 1.5 INSPECTION AND CLEANING
traction motors, or Class 1E nuclear service motors.
1.5.1 Inspection
1.3 IDENTIFICATION
If required clean the external surfaces of the equip-
1.3.1 Service Center Labeling ment to avoid contaminating internal components
Machines or standalone components received for during disassembly. Disassembly should be done
repair should have the repair company’s name or methodically. Record the condition of all components,
identifying logo and shop order number permanently take dimensions necessary for reassembly, condition
affixed to machine or standalone components for
assessment and fault diagnosis. Each component
future reference. This shop order number should be should be clearly and indelibly marked so that it can
listed on the repair invoice.
be placed in the correct location upon re-assembly.
1.3.2 Records It is important to preserve and carefully inspect any
A record of each machine received for repair should material or component that may have been involved
be established at the time of receipt and kept on file in a failure. Inspect all parts for wear and damage.
for at least 3 years. The record should include the Insulation should be examined for evidence of
nameplate data, electrical test data (both before and degradation or damage, such as:
after repair), mechanical measurements (both before (1) Puffiness, cracking, separation or discoloration
and after repair), original winding data, final wind- as indication of thermal aging.
ing data, and details of replaced parts. This record (2) Contamination of coil and connection surfaces.
should be made available to the customer for review (3) Abrasion or other mechanical stresses.
if requested. The primary cause of failure should be (4) Evidence of partial discharges (corona).
determined, if possible, and should be recorded on (5) Loose wedges, fillers, ties, banding, or surge
the apparatus repair record. rings.
1.3.3 Nameplate (6) Fretting at supports, bracing or crossings (an
An electrical machine should have a permanent indication of looseness or movement).
nameplate containing the principal information (Reference: IEEE Std. 432, Sec. 5.)
needed to put the machine into service. The original Bars and end rings for amortisseur and squirrel
nameplate is preferred. If a machine is redesigned, cage windings should be examined for evidence of
the original nameplate should remain on the unit defects. Testing may be needed (see Paragraph 4.3.2).

Copyright © 2020, EASA, Inc. (Version 0920) 1