17
Instructional Booklet IB02102006E
Effective May 2011
Type MVS (previously WLI)
metal-enclosed switchgear—
4.76 kV, 15.0 kV, 27.0 kV, and 38.0 kV
EATON CORPORATION www.eaton.com
Maintenance
Inspection schedule
The MVS switch should be inspected once a year or after its rated
current interruptions, as specified in industry standard ANSI C37.22,
whichever occurs first. After the switch has been closed against a
fault current, it should be inspected at first opportunity.
Inspection procedure
WARNING
FAILURE TO COMPLETELy DISCONNECT THE SWITCH FROM ALL POWER
SOURCES PRIOR TO INSPECTION OR MAINTENANCE MAy RESULT IN
SEVERE INJURy OR DEATH.
THE SWITCH MUST BE COMPLETELy DISCONNECTED FROM ALL POWER
SOURCES BEFORE PERFORMING ANy INSPECTION OR MAINTENANCE.
Electrical parts and insulation check and cleaning
WARNING
NORyL INSULATED EQUIPMENT: ELECTRICAL JOINT COMPOUNDS MUST
NOT BE USED ON CONNECTIONS OR TERMINATIONS TO OR FROM THIS
EQUIPMENT.
DO NOT USE SOLVENTS, OILS, OR GREASES ON OR NEAR THIS EQUIP-
MENT. WATER AND ISOPROPyL ARE THE ONLy APPROVED CLEANERS FOR
THIS EQUIPMENT.
CAUTION
ISOPROPyL ALCOHOL IS FLAMMABLE. PROVIDE ADEQUATE VENTILATION
AND KEEP AWAy FROM FLAMES AND OTHER IGNITION SOURCES.
CONSULT yOUR SAFETy DEPARTMENT BEFORE USING.
De-energize the primary circuits before removing any enclosure
parts. Before cleaning, take “Megger” readings between live parts
and to ground. Inspect the switch for signs of overheating or weak-
ened insulation. Remove dust from barriers, live parts, insulators,
drive rod links, and enclosure surfaces. If necessary, wipe clean
with isopropyl alcohol or distilled water, then wipe dry.
After the barriers, live parts, insulators, and drive rod links have been
dusted and wiped clean, take “Megger” readings again between the
live parts and between phases. Keep a record of these readings for
future reference in determining when trends occur that would
indicate a lowering of the insulation resistance.
Periodic high potential tests are not required and are recommended
only after repair of high voltage live parts or insulation, or when the
trend of “Megger” readings indicates it to be advisable. This field
test should be made before the main cables are connected and
should not exceed the values in Table 3.
Table 3. Field Dielectric Test Values.
kV Class
Test Voltage, 60 Hz AC,
Applied for 1 Minute
4.76 14.25
15 27
27 45
38 60
When finished cleaning and checking the switch, “Close” and
“Open” the de-energized switch at least three times to check the
performance of the operating mechanism.
Alignment procedures
WARNING
FAILURE TO COMPLETELy DISCONNECT THE SWITCH FROM ALL POWER
SOURCES PRIOR TO INSPECTION OR MAINTENANCE MAy RESULT IN
SEVERE INJURy OR DEATH.
THE SWITCH MUST BE COMPLETELy DISCONNECTED FROM ALL POWER
SOURCES BEFORE PERFORMING ANy INSPECTION OR MAINTENANCE.
CAUTION
LOW CLOSING OR SLOW OPENING THE SWITCH AGAINST THE SPRING
MAy RESULT IN BODILy INJURy IF A PERSON IS NOT CAREFUL TO HOLD
THE OPERATING HANDLE FIRMLy.
BE SURE TO HOLD THE HANDLE FIRMLy WHILE PERFORMING SLOW
CLOSING OR SLOW OPENING OPERATIONS.
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