Particular Safety Instructions For Winding Maintenance; The Timing Of The Maintenance - ABB AMA Manual

Manual for High Voltage Process Performance Motors

7.6.1 Particular safety instructions for winding maintenance

7.6.2 The timing of the maintenance

60 - Maintenance
2. IEEE Std. 432-1992, IEEE Guide for Insulation Maintenance for Rotating Electrical
Machinery (5 hp to Less Than 10 000 hp)
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.
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.
3BFP 000 063 R0101 REV D