Inspection intervals
Operating and Maintenance Instructions
8
1HSB435409-100 en1
3.1 Maintenance summary
Explanations:
1. Mech. oper. = Mechanical Close-Open operations.
2. CLOSE/OPEN oper. with el load = Close-Open operations with electrical
loading.
3. Special requirements for resistance check of circuit-breakers operated
< 100 CLOSE/OPEN operations/year.
Type of measure Inspection interval
Explan-
ation
Conditionof
circuit-
breaker
during work
Com-
petence
require-
ments
A Ocular inspection 1-2 years a1 a2
B Preventive maintenance
Intermediate check
• Operation test including
timing test
• Thermovision check
• Greasing of Wormgear
3-6 years or 2,000 mech.
CLOSE/OPEN operations.
1) b1 b2
C Preventive maintenance
• General check of circuit-
breaker and operating
mechanism
15 years or 5,000 mech.
CLOSE/OPEN operations.
1), 3) b1 b2
D Overhaul
• Overhaul of breaking
chambers
• Line and transformer
circuit-breakers
• Capacitor-reactor and filter
circuit-breakers
• Not synchronized
• Synchronized
• Major overhaul
2,500 CLOSE/OPEN op.
with el. load.
5,000 CLOSE/OPEN op.
with el. load.
30 years or 10,000 mech.
CLOSE/OPEN operations.
2)
1)
c1
d1
c2
c2
LTB 245E1:
ΣnxI
2
=20,000
LTB 420E2:
ΣnxI
1.9
=20,000
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