Westinghouse's Transmission and Distribution Handbook and
Applied Protective Relaying Handbook (These are out of print but may be
available in personal libraries.)
Electric Power Research Institute (EPRI) Electrical Power Reference Series,
Volumes 1 through 13.
Electrical maintenance activities fall into three general categories:
Routine Maintenance Activities that are conducted while equipment and
systems are in service. These activities are predictable and can be scheduled
and budgeted. Generally, these are the activities scheduled on a time-based or
meter-based schedule derived from preventive or predictive maintenance
strategies. Some examples are visual inspections, infrared scans, cleaning,
functional tests, measurement of operating quantities, lubrication, oil tests,
governor, and excitation system alignments.
Maintenance Testing Activities that involve the use of test equipment to
assess condition in an off-line state. These activities are predictable and can
be scheduled and budgeted. They may be scheduled on a time or meter basis
but may be planned to coincide with scheduled equipment outages. Since these
activities are predictable, some offices consider them "routine maintenance" or
"preventive maintenance." Some examples are Doble testing, insulation resitance
testing, relay testing, circuit breaker trip testing, alternating current (AC) hipot
tests, high-voltage direct current (HVDC) ramp tests, battery load tests.
Diagnostic Testing - Activities that involve use of test equipment to assess
condition of equipment after unusual events such as faults, fires, or equipment
failure/repair/replacement or when equipment deterioration is suspected.
These activities are not predictable and cannot be scheduled because they are
required after a forced outage. Each office must budget for these events. Some
examples are Doble testing, AC hipot tests, HVDC ramp tests, partial
discharge measurement, wedge tightness, core magnetization tests, pole drop
tests, turns ratio, and core ground.
This FIST volume addresses scheduling of maintenance activities in the first
two categories. It does not address followup work generated by
maintenance or maintenance testing, nor does it address
(with a few exceptions). Also, maintenance staff may be used for other
activities such as improvements and construction, but this guide does not
address these activities.