why semiconductor fuse used in drive ,not ordinary?
- 4 Answers
- 16243 Views
- EAP, Essar, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Because semiconductors has negative resistance temperature
co-efficient. When current flows in it, its temperature
increases due to I^2*R losses but resistance decrease
accordingly. The decrease in resistance allows more current
to flow in it which produces more heat. It will melt
ultimately.
| Is This Answer Correct ? | 32 Yes | 2 No |
Answer / j.kesavan
IT IS A FAST ACTING FUSE ,KA RATING IS VERY LOW, IF ANY
PROBLEM IN THE FIELD DRIVE WILL NOT AFFECT.THATS WHY WE AR
USING SEMICONDOCTOR FUSE IN VSD DRIVES
| Is This Answer Correct ? | 10 Yes | 2 No |
Answer / jane lal
IT IS A FAST ACTING FUSE ,KA RATING IS VERY LOW, IF ANY
PROBLEM IN THE FIELD DRIVE WILL NOT AFFECT.THATS WHY WE AR
USING SEMICONDOCTOR FUSE IN VSD DRIVES
| Is This Answer Correct ? | 5 Yes | 1 No |
Answer / harish nair
Basically a drive means cluster of thyristors, these thyristors may fail when subject to 10mS(one half cycle in a 50 Hz system)pulse of only 10 times the RMS value of normal current.A normal fuse requires 15 to 30 times of its nominal ampere rating to melt with in 10mS, which is not fast enough to provide the protection, whereas a semiconductor fuse requires only 5 to 6 times it ampere rating to defuse thus ensuring fast action & protection to thyristor. It has a exponentional decay graph the greater the current the lesser operation time.
| Is This Answer Correct ? | 1 Yes | 1 No |
why transfromer rating gives in MVA Or KVA? Why not in MW or KW?
IS HI-POT TEST DONE ON A TRANSFORMER - YES OR NO? WHY?
why voltage drop will occurs in 3 phase line?
Please brief what is sinewave
why -48 volts dc used in telecommucation
how do you find making current and breaking current of the circuit breaker
How many types of oil using in H/T & L/T Oil Circuit Breakers. need Explenation ?
tell me the operation of ELCB. How it detects a fault?
Define damping ratio.
why are distributed windings generally used in alternators?
Give the topology of current amplifier with current shunt feedback?
will a transformer work when pulsating dc id applied to its primary?? what will be the result??
-
Civil Engineering (5085) - Mechanical Engineering (4451)
- Electrical Engineering (16632)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
