Dropout Fuse Cutout is composed of insulator supports and fuse tube,static contacts is fixed on two sides of insulator support and moving contact is installed on two ends of fuse tube.Fuse tube is composed of inside extinguishing tube,outer phenolic compound paper tube or epoxy glass tube.Load switching fuse cutout provides enforced elastic auxiliary contacts and arc-extinguishing enclosure for switching on/off loading current.At normally working via fuse link tightened the fuse tube is fixed to form up of close position.In case system occur faults,fault current result in fuse melt immediately and take place electric arc,which let arc-extinguishing tube being heated and explode a lot of gas.This will produce high pressure and blow off the arc along with tube.
After fuse link melt moving contact has no tightened strength again,mechanism is locked and fuse tube dropout.Cutout now is in open position.
When it needs to switch off during cut out loading.Operator shall via insulating operating bar pull the moving contact,at its beginning main contact and auxiliary static contact is contacted still.
Whiling pulling the auxiliary contact is separated between auxiliary contacts there occur electric arc and the arc will be lengthened in arc-extinguishing enclosure gap and meanwhile arc-extinguishing explode gas to blow off the arc during current passing zero.
Material:Silicone rubber or Porcelain.
Manufacturing Standard:IEC 60282-2.
Parallel-groove connector
Tinned for No.6 soild through 250 KC mil stranded copper or aluminum.
Recoil bar
Heavy galvanized steel(which is also used for inserts, hangers, structural bolts and nuts)
Brid proof-design insulator
Higher insulation characteristics than ANSI distribution-cutout standards and equal in most cases to ANSI switch and bus standards
Lower contacts
Not visible-silver-to-silver, provide dual current path, independent of hingepivot, Stainless-steel backup springs prevent arcing when tube rises in hinge during recoil
Upper Contacts
Silver-to-siver at both surfaces
Attachment hooks
For load buster. Heavy construction also serves to guide tube during closing
Fuse tube
Fiber-lined epoxy fiber glass
Toggle joint
Collapses to permit dropout when link severs
Sturdy ferrules
Pinned to top and bottom of tube for permanent alignment, Large, accessible lifting ring.
Trunnion pocket
Secures tube in hinge during closing
Trunnion casting
Surfaces around trunnion bear on broad hinge surfaces to keep tube in alignment during closing
Flipper
Gives high-speed terminal separation, quick cable flip-out, and(in concoction with the toggle joint) reduces transmission of forces to fuse link during closing
Technical Details
| Type model | Rated voltage
(kV) |
Rated current
(A) |
Breaking current
(kA) |
Impulse
voltage BIL (kV) |
Power frequency
withstand voltage (kV) |
Leakage distance
(mm/kV) |
Material |
|---|---|---|---|---|---|---|---|
| RW-11/100 | 11 | 100 | 6.3 | 100 | 35 | 25-31 | Polymer |
| RW-11/200 | 11 | 200 | 10 | 100 | 35 | 25-31 | Polymer |
| RW-11/400 | 11 | 400 | 12.5 | 100 | 35 | 25-31 | Polymer |
| RW-12/100 | 12 | 100 | 6.3 | 110 | 40 | 25-31 | Polymer |
| RW-12/200 | 12 | 200 | 10 | 110 | 40 | 25-31 | Polymer |
| RW-15/100 | 15 | 100 | 6.3 | 125 | 45 | 25-31 | Polymer |
| RW-15/200 | 15 | 200 | 10 | 125 | 45 | 25-31 | Polymer |
| RW-18/100 | 18 | 100 | 6.3 | 130 | 50 | 25-31 | Polymer |
| RW-18/200 | 18 | 200 | 10 | 130 | 50 | 25-31 | Polymer |
| RW-21/100 | 21 | 100 | 6.3 | 140 | 58 | 25-31 | Polymer |
| RW-21/200 | 21 | 200 | 10 | 140 | 58 | 25-31 | Polymer |
| RW-24/100 | 24 | 100 | 6.3 | 150 | 65 | 25-31 | Polymer |
| RW-24/200 | 24 | 200 | 10 | 150 | 65 | 25-31 | Polymer |
| RW-27/100 | 27 | 100 | 6.3 | 160 | 68 | 25-31 | Polymer |
| RW-27/200 | 27 | 200 | 10 | 160 | 68 | 25-31 | Polymer |
| RW-30/100 | 30 | 100 | 6.3 | 170 | 70 | 25-31 | Polymer |
| RW-30/200 | 30 | 200 | 10 | 170 | 70 | 25-31 | Polymer |
| RW-33/100 | 33 | 100 | 6.3 | 175 | 75 | 25-31 | Polymer |
| RW-33/200 | 33 | 200 | 10 | 175 | 75 | 25-31 | Polymer |
| RW-33/400 | 33 | 400 | 12.5 | 175 | 75 | 25-31 | Polymer |
| RW-36/100 | 36 | 100 | 6.3 | 180 | 80 | 25-31 | Polymer |
| RW-36/200 | 36 | 200 | 10 | 180 | 80 | 25-31 | Polymer |
Porcelain Dropout Fuse Cutouts are used in various applications within the power transmission and distribution industry. Here are the main application places:
1. Overhead Distribution Lines: Porcelain Dropout Fuse Cutouts are widely used in overhead power lines to protect transformers, capacitor banks, and branch lines from faults and overloads.
2. Transformers: These fuse cutouts are installed on distribution transformers to provide overcurrent protection and to isolate the transformer in case of a fault.
3. Capacitor Banks: They are used to protect capacitor banks in distribution networks by disconnecting them during fault conditions.
4. Branch Circuits: Fuse cutouts are employed on branch circuits to protect the equipment and cables from damage due to overcurrents or faults.
5. Renewable Energy Installations: They are increasingly used in renewable energy systems, such as solar and wind farms, to protect the equipment and ensure safe operation.
6. Industrial and Commercial Facilities: Porcelain Dropout Fuse Cutouts are also utilized in industrial and commercial facilities for protecting various electrical equipment and ensuring reliable power supply.
These applications highlight the importance of Porcelain Dropout Fuse Cutouts in maintaining the safety and reliability of electrical distribution systems.
A Porcelain Dropout Fuse Cutout is a protective device used in electrical distribution systems to safeguard transformers, capacitor banks, and other equipment from overcurrent conditions and faults. It consists of a Porcelain housing that encases a fuse element.
Porcelain materials have been traditionally used in fuse cutouts for several reasons. Here are the key advantages of using porcelain materials in fuse cutouts:
1. High Mechanical Strength: Porcelain is known for its robust mechanical properties, providing high resistance to mechanical stress and impact, which is crucial for outdoor applications exposed to varying weather conditions.
2. Excellent Insulating Properties: Porcelain has excellent electrical insulating properties, ensuring effective isolation of electrical components and preventing accidental short circuits.
3. Thermal Stability: Porcelain can withstand high temperatures without degrading, making it suitable for use in environments with significant thermal variations.
4. Durability: Porcelain is highly durable and has a long service life, which reduces the need for frequent replacements and maintenance, resulting in lower operational costs over time.
5. Resistance to Environmental Factors: Porcelain is resistant to weathering, UV radiation, and chemical attacks, making it ideal for outdoor use in harsh environmental conditions.
6. Cost-Effective: Porcelain is a cost-effective material, especially for high-voltage applications, due to its abundant availability and established manufacturing processes.
7. Historical Reliability: Porcelain has a long history of reliable performance in electrical insulation applications, which provides confidence in its use based on extensive field experience.
These advantages make porcelain a reliable and widely used material for fuse cutouts in electrical distribution systems, especially in applications where mechanical strength and durability are paramount.
When an overcurrent or fault occurs, the fuse element inside the cutout melts, causing the fuse to drop out and create an open circuit. This action isolates the faulty section of the network, preventing damage to other equipment and ensuring safety.
They are typically installed on overhead distribution lines, distribution transformers, capacitor banks, branch circuits, renewable energy installations, and in industrial and commercial facilities.
The fuse rating is selected based on the load current and the maximum fault current the system can experience. It’s important to consider the protection requirements of the specific equipment being safeguarded and to consult manufacturer guidelines and standards for proper selection.
Regular visual inspections are recommended to check for signs of damage, contamination, or wear. Additionally, periodic testing and cleaning may be necessary to ensure optimal performance. It’s important to follow the manufacturer’s maintenance guidelines.
Yes, Porcelain cutouts are particularly well-suited for high pollution areas due to their superior resistance to contaminants and UV radiation. Their hydrophobic properties help in maintaining insulation performance in polluted environments.
