Embed Size (px)
Citation preview
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
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 7
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
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 10
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
EduPack Trainng Modules – Fuse Technology and Operation - Mersen© 2012 12
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
