Title Page
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Site conducted
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Conducted on
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Apparatus Location
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Prepared by
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Location
Maintenance
- CB
Information
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Designation
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Type Ref
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Serial Number
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Manufacturer
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Year of Manufacture
CB All Types
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Mechanism Checks
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Timing Tests - Open (mS)
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Timing Tests - Close (mS)
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Gauges, Pressure Switches - check
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Rubdown & patch paint as required
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Number of Operations
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Reset Maintenance Counter
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Inspect control cubicle
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Check door seals and clean out kiosk
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Lubricate hinges, catches and locks
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Check and clean contactors
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Check all fuses
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If the CB is SF6 Filled, is there a test point?
SF6 Analysation (if single gas zone, record under RED)
RED (L1)
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Dew Point
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Acidity
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Air Content
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Purity
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Pressure
YELLOW (L2)
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Dew Point
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Acidity
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Air Content
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Purity
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Pressure
BLUE (L3)
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Dew Point
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Acidity
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Air Content
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Purity
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Pressure
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Is this CB withdrawable?
CB Housing
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Check overall condition of CB housing
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Check condition of any interlocks and drive mechanisms within the housing
Ductor Tests
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RED (L1)
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YELLOW (L2)
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BLUE (L3)
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Phase-Earth
Cable End Box
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Check correct operation of interlocks
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Check overall condition of cable end box
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Check for ingress of moisture
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Check for any rust, verdigris or corundum
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Checks overall condition of cables
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Check condition and torque settings of terminations
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Check screens and earthing connections
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Check all boots and heatshrinks
CTs
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Check overall condition
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Check condition of secondary wiring: Record resistance to earth (500V megger, >5Mohms expected)
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Clean terminal boxes
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Rubdown & patch paint as required
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Ductor HV connections
Oil Filled
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Check Oil Level
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Oil Moisture test
SF6 Filled
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Check Gas Pressure
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Check dewpoint
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Check acidity
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Rubdown & patch paint as required
Bushings
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Check condition of bushings
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Check torque settings of terminations
Oil filled bushings
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Check oil Level
