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Dropout Fuses
Drop Out Fuse (D.O.F) are fuse carriers of fiber glass tube with heavily tinned non ferrous metal parts at both the ends. The brush type phosphorous bronze contacts provide high pressure multi-line connection, wiping and cleaning action. The drop out fuses are widely used for system protection as a secondary back-up against faults or troubles. Installed at high-voltage side, they are able to provide protection in case the trouble is persistent.
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| Sl.No | Make dropout fuses |
| 16. | 11 KV DROPOUT Fuse 'D type |
| 17. | 11 KV DROPOUT Fuse CHANNEL type |
| 18. | 22 KV DROPOUT Fuse DOUBLE STACK CHANNEL type |
| 19. | 22 KV DROPOUT Fuse DOUBLE STACK "D type |
| 20. | 33 KV DROPOUT Fuse DOUBLE STACK CHANNEL type |
| Sl.No | Make horn gap fuse |
| 21. | 11 KV HORN Gap Fuse |
| 22. | 22 KV HORN Gap Fuse |
| 23. | 33 KV HORN Gap Fuse |
| Sl.No | Spares for dropout fuses available from 22 KV to 33 KV |
| 1. | SRBP tube only |
| 2. | Fiber Glass tube only |
| 3. | SRBP tube with Metal fitting on both ends |
| 4. | Fix Top Contact/L Contact |
| 5. | Fix bottom Contact |
| S. No | Particulars | Technical Particulars |
| 1. | Manufacturer's type / Designation / Installation | JBEPL |
| 2. | Manufacturer's name and country of manufacture | Jaipuria Brothers Electricals Pvt. Ltd., Delhi |
| 3. | Standard (s) according to which the relevant standard | IS 9385/ (Part I/II) |
| 4. | Operating Voltage | 11 KV |
| 5. | Rated Voltage | 12 KV |
| 6. | Continuous current | 100 A |
| 7. | Type of counting | As per drawing to be approved |
| 8. | Rated frequency | 50 Hz |
| 9. | Insulation levels | As per relevant IS |
| 10.1 | One minute Power frequency withstand across isolating distance of fuse base | 32 KV |
| 10.2 | One minute Power frequency withstand voltage to earth and between poles | 28 KV |
| 10.3 | Standard Impulse withstand (1.2/50 micro seconds) to earth and between poles (peak) | 85 KV |
| 10.4 | Standard Impulse voltage across isolating distance of fuse base | 75 KV |
| 11. | Temperature rise limit (for copper contacts)(deg. C) | 25 deg.C |
| 12. | Temperature rise for terminals in (deg. C) | 40 deg. C |
| 13. | Type of fuse / rating | Expulsion type, 1.5 A |
| 14. | Material of fuse barrel | Fibre glass tube 25 mm OD |
| 15. | Fuse tube ID | 15mm |
| 16. | Rated breaking capacity | As per relevant IS |
| 17. | Fuse base top current carrying part | Brass / GM |
| 18. | Environmental protection of current carrying part | NA |
| 19. | Fuse base bottom assembly | Brass / GM |
| 20. | Fuse carrier top assembly | Brass / GM |
| 21. | Fuse Carrier bottom assembly | As per drawing to be approved |
| 22. | Material of spring | Phosphor Bronze / SS |
| 23. | Material of contacts (incoming) | Copper / Glass / Bronze / GM |
| 24. | Details of terminal connections (outgoing) | Aluminium connector for ACSR Dog conductor |
| 25. | Anticorrosive Property (Fe parts) | Hot dip Galvanized electroplated |
| 26. | Anticorrosive Property (non-ferrous parts) | Silver / tin plated |
| 27. | Applicable standard | IS 9385/ (Part I/II) |
| 1. | Make | JBEPL | |
| 2. | Drawing No. | JB-1007 | |
| 3. | Rated Voltage | 33 KV | |
| 4. | Highest System Voltage | 36 KV | |
| 5. | Rated Current | 100/200A | |
| 6. | Minimum Air Clearance between: | ||
| a) | Poles | 1300mm | |
| b) | Live parts and Earth | 500mm | |
| 7. | Mounting position | Vertical | 22KV |
| 8. | 33KV Solid Core/22KV post Insulators shall be fitted & each insulator confirm to following specifications: | 33KV | 22KV |
| i) | Make | * | * |
| ii) | No. of unit per insulator stack | 1 | 2 |
| iii) | P.C.D | 76mm | 76mm |
| iv) | Maximum shed diameter | 108mm | 101 mm |
| v) | Minimum total creepage distance | 860mm | 430mm |
| vi) | Over all height of the insulator | 509mm | 254mm |
| vii) | Highest system voltage | 36KV | 24KV |
| viii) | Tensile strength | 5455 Kg | 3060 Kg |
| ix) | Torsional strength | 115 mkg | 70 mkg |
| x) | Compressive strength | 7000 Kg | 4600 Kg |
| xi) | Flash over voltage (Dry) | 145 KV | 90 KV |
| xii) | Flash over voltage (Wet) | 100KV | 60KV |
| xiii) | Dry one minute power frequency withstand voltage | 95KV | 80KV |
| xiv) | Wet one minute power frequency withstand voltage | 80KV | 55KV |
| xv) | Weight of the insulator | 14.5 Kg | 6.1 Kg |
| xvi) | 1.2/50 microsecond wave Impulse voltage | 200KV | 125KV |
| 9. | Weight of D.O. Fuse | 110 Kg Approx |
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