CERAMIC FUSE TUBE/BARRELS USED IN HRC FUSE
[EIRI/EDPR/1590] J.C.388
INTRODUCTION
In electronics and electrical engineering, a fuse (from the French fuser, Italian fuso, "spindle") is a type of low resistance resistor that acts as a sacrificial device to provide over current protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Short circuits, overloading, mismatched loads, or device failure are the prime reasons for excessive current. Fuses are an alternative to circuit breakers.
A fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented. Wiring regulations often define a maximum fuse current rating for particular circuits. Over current protection devices are essential in electrical systems to limit threats to human life and property damage. The time and current operating characteristics of fuses are chosen to provide adequate protection without needless interruption. Slow blow fuses are designed to allow harmless short term currents over their rating while still interrupting a sustained overload. Fuses are manufactured in a wide range of current and voltage ratings to protect wiring systems and electrical equipment.
HRC fuse or high rupturing capacity fuse- In that type of fuse, the fuse wire or element can carry short circuit heavy current for a known time period. During this time if the fault is removed, then it does not blow off otherwise it blows off or melts.
The enclosure of HRC fuse is either of glass or some other chemical compound. This enclosure is fully air tight to avoid the effect of atmosphere on the fuse materials. The ceramic enclosure having metal end cap at both heads, to which fusible silver wire is welded. The space within the enclosure, surrounding the fuse wire or fuse element is completely packed with a filling powder. This type of fuse is reliable and has inverse time characteristic, that means if the fault current is high then rupture time is less and if fault current is not so high then rupture time is long.
Operation of HRC Fuse
When the over rated current flows through the fuse element of high rupturing capacity fuse the element is melted and vapourized. The filling powder is of such a quantity that the chemical reaction between the silver vapour and the filling powder forms a high electrical resistance substance which very much help in quenching the arc.
COST ESTIMATION
Plant Capacity 10 MT/Day
Land & Building (8000 sq.mt.) Rs. 5.20 Cr
Plant & Machinery Rs. 6.00 Cr
Working Capital for 3 Months Rs. 4.88 Cr
Total Capital Investment Rs. 16.57 Cr
Rate of Return 40%
Break Even Point 45%
CONTENTS
INTRODUCTION
USES AND APPLICATION
DIMENSION OF CERAMIC FUSE TUBE/BARREL
HIGH RUPTURING CAPACITY (HRC) FUSE
ADVANTAGE OF THE HRC FUSE
RAW MATERIALS
MARKET SURVEY
INSTALLED CAPACITY, PRODUCTION & CAPACITY UTILIZATION OF CERAMIC FUSE TUBES/BARRELS FOR HRC FUSES
APPARENT CONSUMPTION OF CERAMIC FUSE TUBE/BARRELS FOR HRC FUSES
ESTIMATED DEMAND
DEMAND & SUPPLY GAP
PRESENT MANUFACTURERS OF CERAMIC FUSE TUBE/BARRELS
FORMULATION OF CERAMIC FUSE TUBES/BARRELS
MANUFACTURING PROCESS OF CERAMIC FUSE TUBES/BARRELS
PROCESS FLOW DIAGRAM
ELECTRIC FUSE AND ITS CONSTRUCTION
CURRENT CARRYING CAPACITY OF FUSE WIRE
CONSTRUCTION AND RATING OF DIFFERENT FUSES
PLANT LAYOUT
SUPPLIERS OF RAW MATERIALS
SUPPLIERS OF PLANT & MACHINERIES
LABORATORY TESTING EQUIPMENT
SUPPLIERS OF PLANT & MACHINERIES (IMPORTED)
PRINCIPLES OF PLANT LAYOUT
PLANT LOCATION FACTORS
EXPLANATION OF TERMS USED IN THE PROJECT REPORT
APPENDIX – A:
01. PLANT ECONOMICS
02. LAND & BUILDING
03. PLANT AND MACHINERY
04. OTHER FIXED ASSESTS
05. FIXED CAPITAL
06. RAW MATERIAL
07. SALARY AND WAGES
08. UTILITIES AND OVERHEADS
09. TOTAL WORKING CAPITAL
10. TOTAL CAPITAL INVESTMENT
11. COST OF PRODUCTION
12. TURN OVER/ANNUM
13. BREAK EVEN POINT
14. RESOURCES FOR FINANCE
15. INSTALMENT PAYABLE IN 5 YEARS
16. DEPRECIATION CHART FOR 5 YEARS
17. PROFIT ANALYSIS FOR 5 YEARS
18. PROJECTED BALANCE SHEET FOR (5 YEARS)