Electrical Equipment and Motors

General

Where vendors provide recommendations for site storage and protection, these are to be followed and take precedence over the following recommendations.

Where prolonged site storage is involved, which is not under the control of vendors, equipment guarantees are invalidated. However most vendors offer a re-furbishing service after which equipment guarantees are re-instated. Such a service is outside normal Company contracts but clients are recommended to take up this option where applicable at their own expense

Storage

Electrical equipment must be stored in the warehouse.

220 and 110 volt electrical supply to be available adjacent to stored motors and equipment to enable anti-condensation heaters and equipment to be energized where necessary. Equipment transportation supports and temporary stiffening to be checked for soundness and repaired as necessary.

Ensure all nameplates are intact and secure.

All motors to have shafts manually rotated frequently, at least once per week. This must not be carried out with tools which will damage or mark motor shafts.

Protection

All damaged painted Mark/Tag Numbers to be reinstated and maintained.

All threaded entries to be plugged and threads recoated with rust preventatives where necessary.

All gland plates to be checked and reinstated where required.

Where moisture absorbents are included to protect equipment it should be replaced with a fresh charge immediately on receipt in the site stores and replaced on a regular basis thereafter.

Motors

Motor bearings to be checked regularly to ensure grease is in good condition, should it harden or be discolored the bearings should be cleaned out and regreased.

Motor condensate drain plugs to be removed periodically to remove any accumulated moisture. Plugs to be replaced to avoid ingress of dust.

All bright metal parts, machined surfaces (i.e. shafts) to be coated with rust preventatives.

All 6000V. motors should have insulation resistance values measured and recorded every 3 months against climatic conditions at time of test. If the reading is not greater than 6 megohm an approved method of drying out is to be undertaken to achieve acceptable resistance readings. Connect anti-condensation heaters.

Transformers and Capacitors

Where units are supplied complete with insulation liquids/gases these should be checked on arrival at Site. If level or pressure is not within vendor's tolerances, possible leaks should be located and rectified. Monthly checks on level/pressure should be made and rectification work carried out as necessary.

Any separately supplied insulation liquids should be stored on an incline, containers should not be left stored in upright position.

Switchgear, Motor Control Centres, Inverters, Battery Charger Units, Etc.

Unless provided with anti-condensation heaters the equipment shall be removed from the packing cases with the plastic coverings left in place and resealed where damage has occurred during shipment.

Where anti-condensation heaters are fitted these shall be connected.

Spot insulation tests shall be carried out every 6 weeks and where readings are low an approved drying out procedure shall be adopted to achieve acceptable resistance readings.

Batteries should be stored in an inactive area to avoid accidental breakage and seals should be regularly checked for damage. Damaged seals shall be renewed in accordance with Vendors instructions.

Nickel-cadmium and lead-acid batteries that have been shipped dry do not require maintenance.

Electrolyte levels in batteries that have been shipped wet should be checked and topped up as required.

These batteries should also be given a re-freshing charge tri-monthly.

Cable

Measure and record gas pressure in low pressure gas filled cable when received and weekly thereafter. If falling pressure indicates a leak in cable, maintain same with dry nitrogen until leak is sealed. Rotate reels of paper insulated lead sheathed cable 90° every 2 weeks to prevent migrating oil from collecting at low points.


Copyright © 2000 - unisam
Designed by Earthweb