Manual for High Voltage Process Performance Motors
60 - Maintenance
3BFP 000 063 R0101 REV D
2. IEEE Std. 432-1992, IEEE Guide for Insulation Maintenance for Rotating Electrical
Machinery (5 hp to Less Than 10 000 hp)
7.6.1 Particular safety instructions for winding maintenance
Some of the hazardous works of the winding maintenance include:
• Handling of hazardous solvents, varnishes, and resins. Hazardous substances are required
for cleaning and re-varnishing windings. These substances can be dangerous if inhaled,
swallowed or in any contact with skin or other organs. Seek proper medical care if an
accident occurs
• Dealing with flammable solvents and varnishes. Handling and use of these substances
should always be by authorized personnel and proper safety procedures must be followed
• Testing at high voltage (HV). High-voltage tests should only be conducted by authorized
personnel and proper safety procedures must be followed.
Dangerous substances used in winding maintenance are:
• White spirit: solvent
• 1.1.1-trichloroethane: solvent
• Finishing varnish: solvent and resin
• Adhesive resin: epoxy resin.
NOTE: There are special instructions for handling dangerous substances during maintenance
work. These instructions must be followed.
Some general safety measures during winding maintenance are as follows:
• Avoid breathing air fumes: ensure proper air circulation at the work site or use respiration
masks
• Wear safety gear such as glasses, shoes, hardhat and gloves and suitable protective
clothing to protect the skin. One should always use protective creams
• Spray-varnish equipment, the frame of the machine, and the windings should be earthed
during spray varnishing
• Take necessary precautions when working in pits and cramped places
• Only people trained to do high-voltage work can carry out a voltage test
• Do not smoke, eat, or drink at the work site.
For a test record for winding maintenance, see Appendix COMMISSIONING REPORT.
7.6.2 The timing of the maintenance
There are three main principles for timing the winding maintenance:
• Maintenance of the windings should be arranged according to other machine maintenance
• Maintenance should be performed only when necessary
• Important machines should be serviced more often than the less important ones. This also
applies to windings that become contaminated rapidly and to heavy drives.
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