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2.1 General description
2.1.1 Power circuit
2.1.1.1 Arcing chamber
2.1.1.2 Insertion resistors
2.1.2 Operating mechanism
2.1.3 Control
2.2 Functioning characteristics
2.2.1 Reliability
2.2.2 Correct function
2.2.3 Operation cycles
2.3 Circuit breaker types
2.3.1 Interrupting medium
2.3.1.1 Mineral oil
2.3.1.2 Compressed air
2.3.1.3 Sulfur hexafluoride,
SF6
2.3.2 Oil circuit breaker
2.3.2.1 Bulk oil circuit breaker
2.3.2.2 Minimum oil circuit breaker
2.3.3 Air blast circuit breaker
2.3.4 SF6 circuit breaker
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3.1 Definition
3.2 Importance
3.3 Description
3.3.1 Installation and connection
3.3.1.1 General rules
3.3.1.2 Connection description
3.3.1.3 Mirror effect
3.3.2 Data acquisition
3.3.3 Data interpretation
3.4 Circuit breaker operating times
3.5 General definitions
3.5.1 Interrupting element (or
unit)
3.5.2 Pole
3.5.3 Main contacts
3.5.4 Auxiliary contacts
3.5.5 Arcing contacts
3.5.6 Indicating contacts
3.5.6.1 “a” contact
3.5.6.2 “b” contact
3.6 Timing reference
3.7 Time definitions according
to IEC 56 international standard
3.7.1 Opening time (IEC 56 3.105.32)
3.7.2 Closing time (IEC 56 3.105.35)
3.7.3 Open-Close time, O-C or
isolation time (IEC 56 3.105.38)
3.7.4 Close-Open time, C-O or
short-circuit time (IEC 56 3.105.42)
3.7.5 Minimum trip duration (IEC
56 3.105.44)
3.7.6 Minimum close duration (IEC
56 3.105.45)
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4.1 Timing chart
4.2 Priority
4.2.1 Priority levels of operation
times
4.2.1.1 “Trip” time
4.2.1.2 Longer “Trip”
time
4.2.1.3 Shorter “Trip”
time
4.2.2 Contacts discrepancy
4.2.2.1 Discrepancy between poles
4.2.2.2 Discrepancy between contacts
on the same pole
4.2.3 Closing time
4.2.4 Operation cycles
4.2.4.1 Trip-Free (C-O) cycle,
short-circuit time
4.2.4.2 Reclose-Open (O-C-O),
isolation time
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