FUSE ADVANTAGES EDUPACK TRAINING MODULE
2012
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 2
SAFETY
Metallic elements inside the fuse melt directly upon the fault current
Arc extinction totally enclosed
The arc flash energy is drastically reduced when the peak current is limited by a
fuse
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 3
SPEED - PEAK-LET-THRU CURRENT
Current-limiting Circuit Breaker
i Non-limiting Circuit Breaker
t
Fuse
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 4
BREAKING CAPACITY
100,000A 200,000A…
and even 300,000A!
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 5
QUASI MAINTENANCE FREE
No maintenance before a short circuit
Maintenance after a short circuit = simplicity
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 6
SELECTIVITY (DISCRIMINATION)
Transformer
F3
F2
Short circuit
Fault current
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POWER QUALITY
fuse current. per-unit
-25
0
25
1.52 1.56 1.6 1.64 time, sec
voltage at bus2, per-unit
1.52 1.56 1.6 1.64 time, sec
+2.4
0.0
-2.4
voltage at bus2, per-unit +2.4
0.0
-2.4
1.52 1.56 1.6 1.64 time, sec
-25
fault current. per-unit
0
25
1.52 1.56 1.6 1.64 time, sec
Transients in system protected by
non current-limiting devices
Transients in system protected by
current-limiting fuses
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 8
FUTURE SYSTEM GROWTH
Fuses generally still comply owing to their initial large breaking capacities
Adding fuses upgrade the breaking capacity of the protection system
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 9
LOW POWER LOSS
Cylindriucal
Fuse
Power loss in
Modulostar® fuse
holder
Circuit Breaker
32A gG or aM
Size 10x38 mm 3W 3.2W
50A gG or aM
Size 14x51 mm 5W 5W
125A aM
Size 22x58 mm 9.5W 14W
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RELIABILITY
Simplicity of the fuse concept
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 11
UNIVERSALITY
Fuses can protect:
• Cables
• Transformers
• Motor circuits
• Capacitors
• Contactors
• Old circuit breakers
• Power electronic equipments
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PRICE
The most economical protection
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 13
FUSE
Full overcurrent protection, Fdelity of operation
Universal use of Time-Delay fuse (ideal all-purpose fuse)
Selectivity, Simplicity, Safety
Economical, Energy limiting, Easy to use
F
U
S
E