Product Description
General
The drop-out fuse and pull load drop-out fuse are essential outdoor high-voltage protective devices. They are strategically installed on the high-voltage side of distribution transformers or the supportive link of distribution lines to provide robust protection against transformer and line short circuits, overloads, and current interruptions. Each drop-out fuse is engineered with an insulating bracket and fuse tubes. Static contacts are securely placed at both ends of the insulation bracket, while moving contacts are installed on both ends of the fuse tube. The fuse tube is meticulously crafted from an inner arc tube and an outer phenolic paper or epoxy glass cloth tube. The pull load drop-out fuse is enhanced with flexible auxiliary contacts and an arc chute, ensuring seamless operation during current interruptions.
In standard operation, the fuse tube maintains a closed position through fuse tension. When system failures occur, fault currents swiftly blow the fuse, creating an arc. This arc activates the arc tube, which burns due to the electric arc, decomposing large amounts of gas. This gas forms high pressure within the tube, creating a vertical wind along the pipeline, stretching and elongating the arc for rapid disconnection. Post-fuse blowout, the moving contact loses tension and shifts outwards, releasing the fuse tube, which drops to form the breaking position. For load pulling, an insulating rod is used to maneuver the moving contact. Initially, the moving and static contacts remain connected. Pulling continues until the auxiliary contacts separate, producing an arc that stretches in the hood slit. The arc cover contains gas, allowing the arc to extinguish when the current reaches zero.
Use and Standards
This product is expertly designed for use in 10 to 35KV distribution line branches and the primary side of distribution transformers. It provides exceptional overload and short circuit protection while enabling the separation and combination of the rated load current.
The product follows the JB/T8321-1996 Method for AC high-voltage fuses. Product parameters adhere to GB15166.3-1994 standards for high voltage expulsion fuses. While these standards do not explicitly define critical parameters and configurations, adjustments are made in accordance with JB/DQ2139-1986 requirements for 10 to 35KV outdoor high voltage drop fuses.
Drop-out fuse cutouts and load switching fuse cutouts are key outdoor high voltage protective devices. They connect to incoming feeders of distribution transformers or lines, primarily protecting against short circuits, overloads, and on/off loading currents. Constructed with insulate supports and fuse tubes, static contacts are fixed on two sides of the insulator support, while moving contacts are placed on both ends of the fuse tube. The fuse tube features an inner arc-extinguishing tube and outer phenolic compound paper or epoxy glass tube. The load switching fuse cutout is equipped with reinforced auxiliary contacts and an arc-extinguishing enclosure for smooth current switching.
In normal working conditions, the fuse link tightens the fuse tube to secure a closed position. During system faults, fault currents immediately melt the fuse, generating an electric arc. This heats the arc-extinguishing tube, releasing gas and producing high pressure to blow the arc through the tube. Once the fuse link melts, the moving contact loses tension, unlocking the mechanism and allowing the fuse tube to drop out, indicating an open position. For cutout load switching, operators use an insulating bar to pull the moving contact. Initially, the main and auxiliary static contacts remain engaged. Continued pulling separates the auxiliary contacts, causing an arc that lengthens in the arc-extinguishing enclosure gap. Simultaneously, gas explodes to extinguish the arc as the current approaches zero.
Product Parameters
| Typ |
Rated Volatge (kv) |
Rated Current (A) |
Breaking current (kA) |
Impulse voltage (BIL) |
Power-frequency withstand voltage |
Leakage distance (mm) |
Weight (kg) |
| UD-1 |
12 |
100 |
6.3 |
110 |
40 |
250 |
5.8 |
| UD-1 |
12 |
200 |
8 |
110 |
40 |
250 |
5.8 |
| UD-2 |
15 |
100 |
10 |
125 |
45 |
320 |
6.9 |
| UD-2 |
15 |
200 |
12 |
125 |
45 |
320 |
6.9 |
| UD-3 |
24 |
100 |
8 |
150 |
65 |
530 |
10 |
| UD-3 |
24 |
200 |
10 |
150 |
65 |
530 |
10 |
| UD-4 |
15 |
100 |
10 |
125 |
45 |
350 |
4.15 |
| UD-4 |
15 |
200 |
12 |
125 |
45 |
350 |
4.15 |
| UD-5 |
12 |
100 |
6.3 |
110 |
40 |
250 |
6.3 |
| UD-5 |
12 |
200 |
8 |
110 |
40 |
250 |
6.3 |
| UD-6 |
15 |
100 |
10 |
125 |
45 |
320 |
10 |
| UD-6 |
15 |
200 |
12 |
125 |
45 |
320 |
10 |
| UD-7 |
24 |
100 |
8 |
150 |
65 |
540 |
10 |
| UD-7 |
24 |
200 |
10 |
150 |
65 |
540 |
10 |
| UD-7(F) |
33 |
200 |
12 |
170 |
70 |
720 |
4.4 |
| UD-8 |
33 |
100 |
10 |
170 |
70 |
720 |
11.6 |
| UD-8 |
33 |
200 |
12 |
170 |
70 |
720 |
11.6 |
Main product
Company Profile
Zhejiang ChaoTai Complete Equipment Co., Ltd. stands as a beacon of innovation in the electrical integration landscape. As a cutting-edge high-tech enterprise, we pride ourselves on an expert R&D, production, and service team that brings over 15 years of rich industry experience to the table.
Our diverse product range includes top-of-the-line high-voltage solid-state soft starters, advanced capacitor cabinets, versatile high and low voltage switchgear, sophisticated gas-insulated switchgear, and robust substations. These products find extensive applications across numerous industries, including energy, chemicals, metal smelting, power grids, industrial manufacturing, academia, healthcare, municipal commerce, water and hydropower management, road traffic systems, as well as both commercial and residential sectors.
Embracing a philosophy of 'smart manufacturing,' we are committed to technological innovation by attracting elite technical talents to bolster our competitive edge. Our journey from inception to excellence is marked by unwavering progress and innovation. We follow a distinguished path characterized by quality-driven survival, market-oriented strategies, reputation-based growth, and efficiency through refined management. Our pledge is to lead with technology, adhere to standardized management, deliver superior quality, and achieve ultimate customer satisfaction. By enhancing our market competitiveness, we are dedicated to elevating China's electric power and grid sectors with ambition and speed. At the heart of our mission lies integrity, quality, stellar service, and unyielding customer satisfaction. Our steadfast commitment to excellence and continual innovation fuels our goal to establish a brand that commands trust and respect in the industry. Your trust is the catalyst for our journey, and we express our heartfelt gratitude to both new and loyal clients for their unwavering support. Senhang Technology eagerly anticipates building a brighter future together, hand in hand.
Our Advantages
Certifications
After Sales Service
FAQ
Q1. Are you a factory or trading company?
A.We are a factory.
Q2. Where is your factory located? How can I visit there?
A. Our factory is located in Wenzhou City, Zhejiang Province, China. You can fly to Longwan airport directly. All our clients,from home or abroad, are warmly welcome to visit us!
Q3. What's the payment term?
A. We accept TT. 30% deposit and 70% before shipment, Western Union, L/C At Sight is ok! We'll l show you the photos of the products and packages before you pay the balance.
Q4. Tell me the standard of package? What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons, If vou have leaallyl registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q5. Would you accept to use our logo?
A. If you have good quantity,it absolute no problem to do OEM.
Q6. How about the transport?
A. If the number of aoods is small we usually use TNT.DHL.FEDEX.EMS and some express voull offered. If the number of the goods is big usually we use the FWD you offered or we provided. Either by sea or by air is OK.
Q7. What is your Production lead time /delivery time?
A: Generally, it will take 25 to 30 days after receivina vour advance payment.
The specificl delivery time depends on the items and the quantity of your order. Silicone rubber's reqular product is 1,000/ week, Porcelain's need 2-3 weeks about 1000 pcs.
Q8. How do you make our business long-term and good relationship?
A:l. We keep aood auality and competitive price to ensure our customers benefit:
A: 2. We respect every customer as our friend and we sincerely do business and make friendsl with them, no matter where they come from.
A: 3.Most goods we have the type report according the IEC STANDARD
Q9. What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the courier cost.
Q10. Can you produce according to the samples?
A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Q11. What is your terms of delivery?
A: EXW, FOB, CFR, CIF.
Q12.What certificates do you have?
A:ISO9001,OHSAS18001,ISO14001 certificate and Type test report of product.
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