Product Description
General
The drop-out fuse and pull load drop-out fuse stand as vanguards in outdoor high-voltage electrical protection. Strategically installed on the high-voltage side of distribution transformers or as the supportive link in distribution lines, these fuses offer robust protection against short circuits and overloads, while facilitating smooth operation with co-load currents. Constructed with an insulating bracket and resilient fuse tubes, the design features static contacts at both ends of the insulation bracket and moving contacts at the ends of the fuse tube. This fuse tube comprises an inner arc tube and an outer layer made from phenolic paper or epoxy glass cloth tube. The inclusion of enhanced flexibility auxiliary contacts and an arc chute in the pull load drop-out fuse further elevates its performance, ensuring seamless operation with co-load currents.
In normal operations, the drop-out fuse maintains a closed position, bolstered by the fuse tube's tension. Upon system failure, the fault current swiftly blows the fuse, initiating an arc. This arc vigorously heats the arc tube, releasing copious gas and generating high pressure within, leading to a vertical wind rush along the pipeline that elongates and stretches the arc. Post blowing, the moving contact loses tension and disengages, releasing the lock mechanism and allowing the fuse tube to drop into its breaking position. During load disengagement, an insulating rod extracts the moving contact, initially keeping it in contact with the static contact. As the auxiliary contacts separate, an arc forms and elongates within the hood slit, with gas in the arc cover extinguishing the arc as the current reaches zero.
Use and Standards
Designed for use in 10 ~ 35KV distribution lines, branching lines, and as the primary side protection for distribution transformers, this product excels in overload and short circuit protection, effectively managing the separation and combination of the rated load current.
The product adheres to the JB/T8321-1996 method for AC high-voltage fuses preparation, with parameters crafted in line with GB15166.3-1994 standards for high voltage expulsion fuses. While certain critical parameters and configurations are not explicitly defined within these standards, adjustments can be made following the JB/DQ2139-1986 interim technology requirements for 10 ~ 35KV outdoor high voltage drop fuses.
Crafted as outdoor high voltage protective devices, drop-out fuse cutouts and load switching fuse cutouts are meticulously designed to connect with incoming feeders of distribution transformers or lines. Their primary role is to shield transformers or lines from short circuits and overloads, while effectively managing on/off load current. These cutouts incorporate insulated insulator supports, fuse tubes, and static contacts fixed on both sides of the insulator support, with moving contacts installed at both ends of the fuse tube. The fuse tube features an inside arc-extinguishing tube complemented by an outer phenolic compound paper or epoxy glass tube. Meanwhile, the load switching fuse cutout enhances performance with enforced elastic auxiliary contacts and an arc-extinguishing enclosure for adept on-off load current management.
Under normal working conditions, the fuse link ensures the fuse tube remains secured in a closed position. When a system fault occurs, the fault current promptly melts the fuse, producing an electric arc that heats the arc-extinguishing tube, causing an explosion of gas and creating high pressure. This forcefully blows the arc along the tube. Once the fuse link melts, the moving contact no longer retains its tension, leading to the locking mechanism's release and the fuse tube's drop, marking the cutout as open. For cutout load switching, operators utilize an insulating operating bar to pull the moving contact. Initially, the main and auxiliary static contacts remain in contact; however, as the pull continues, the auxiliary contacts separate, generating an electric arc within the arc-extinguishing enclosure gap. Concurrently, the arc-extinguishing gas explosively expels, extinguishing the arc as the current reaches 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 pioneering force in the realm of electrical integration. As a high-tech enterprise, we proudly boast a dedicated team specializing in research, development, production, and service, enriched by over 15 years of profound industry expertise.
Our cutting-edge product lineup encompasses high-voltage solid-state soft starters, capacitor cabinets, comprehensive high and low voltage switchgear, and advanced gas-insulated switchgear, as well as substations. These precision-engineered products find extensive applications across diverse sectors such as energy, chemical industries, metal smelting, electric power grids, industrial manufacturing, educational institutions, medical and pharmaceutical sectors, municipal commerce, water conservancy and hydropower, road traffic, and both commercial and residential domains.
Embracing a philosophy of 'smart manufacturing,' we are committed to technological innovation, relentlessly attracting top-tier technical talent to amplify our core competitive edge. Our mission is to offer unparalleled value to our esteemed customers while aspiring to establish a leading brand in the industry. Since inception, we've embarked on a remarkable journey from inception to excellence, consistently evolving with a focus on innovation. Our business ethos is grounded in quality-driven survival, market-driven growth, and reputation-led development, complemented by management-fueled efficiency. Upholding 'technology as the guide, standardized management, excellent quality, and customer satisfaction' as our guiding principles, we aim to elevate the market competitiveness of our quality and technical talent management. Our dedication to serving the transmission and distribution sectors of China's electric power and grid is unwavering, driven by the pursuit of faster, stronger, and higher benchmarks. Our core values remain: integrity as our foundation, quality as our priority, service as our hallmark, and customer satisfaction as our perpetual mission. We aim for excellence, embrace continuous innovation, and strive to build a reputable brand, fueled by your recognition as our motivation. We extend heartfelt gratitude to all our new and loyal customers for their enduring support and encouragement. Together with Senhang Technology, we look forward to forging a brighter, more prosperous future 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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