Power Cutout Fuses Outdoor Distribution
- Model Number:
- SMICO Power Cutout Fuses Outdoor Distribution
- Standard:
- IEC 60282-2:2008, IEEE Std C37.41-2008, IEEE Std C37.42-2009
- Supply Ability:
- 50000/month
- Voltage:
- 10-38kV
- Color:
- Gray or customized
- Material:
- Polymer or Ceramics
Description
SMICO Power Fuses are especially suited for protecting transformers, capacitor banks, and cables in outdoor distribution substations through 34.5 kV. They incorporate precision-engineered nondamageable silver or nickel-chrome fusible elements with time-current characteristics that are precise and permanently accurate — assuring not only dependable performance, but also continued reliability of system coordination plans.
With SMICO Power Fuses, source-side devices may be set for faster operation than practical with other power fuses or circuit breakers, thereby providing better system protection without compromising coordination.
Fault interruption:
Fast, positive fault interruption is achieved in SMU-20 and SMU-40 Fuse Units through high-speed elongation of the arc in the solid-material-lined bore, and by the efficient deionizing action of gases generated through thermal reaction of the solid material due to the heat of the confined arc. The resultant high rate of dielectric recovery voltage more than matches the transient recovery voltage severity of the circuit.
Here’s How it Works
- Overcurrent melts the fusible element, shown below. The strain wire severs, initiating arcing.
- Released force of the drive spring accelerates the arcing rod upward, causing rapid elongation of the arc in the solid-material-lined bore.Under maximum fault conditions, heat from the confined arc causes solid material in the large-diameter lower section of the arc-extinguishing chamber to undergo thermal reaction, generating turbulent gases and effectively enlarging the bore diameter so that the arc energy is released with a mild exhaust. Under low-to-moderate fault conditions, the arc is extinguished in the small-diameter upper section of the arc-extinguishing chamber, where deionizing gases are effectively concentrated for efficient arc extinction.
- Continued upward travel of the arcing rod after arc extinction causes the actuating pin to penetrate the upper seal, initiating positive dropout of the fuse unit.
SM Fuse Units Fusible Element
SM Cutout Fuse Units feature silver or pretensioned nickel-chrome current-responsive elements that are drawn through precision dies to very accurate diameters. They’re of solderless construction, brazed into their terminals. Melting time-current characteristics are precise, with only 10% total tolerance in melting current, compared to the 20% tolerance of many fuses.
These design and construction features assure that SM Cutout Fuse Units conform to their time-current characteristics on a sustained basis. SM Cutout Fuse Units are corrosion-resistant and nondamageable. Age, vibration, and surges that heat the element nearly to the severing point won’t affect their characteristics.
The nondamageability of SM Cutout Fuse Units provides these important advantages:
- Superior transformer protection. You can fuse close to the transformer full-load current and thus protect against a broad range of secondary-side faults.
- Higher levels of service continuity. “Sneakouts” (unnecessary fuse operations) are eliminated.
- Close coordination with other protective devices. No “safety zones” or “set-back allowances” are needed to the published TCCs to protect the element against damage.
- Operating economies. No need to replace unblown companion fuses on suspicion of damage following a fuse operation.
SMICO POWER FUSE MOUNTING FEATURES:
Specification
| Rated(KV) | Rated current(A) | Rated interrupting current(KA) | Lighting impulse withstand voltage to ground(BIL KV) | Minimum powerfrequency withstand dry voltage to ground(KV) | Minimum creepage distance(mm) |
| 11-15 | 100/200 | 12 | 110 | 42 | 220 |
| 11-15 | 100/200 | 12 | 125 | 50 | 320 |
| 24-27 | 100/200 | 12 | 150 | 65 | 470 |
| 33-38 | 100/200 | 8 | 170 | 70 | 660 |
| 33-38 | 100/200 | 8 | 170 | 70 | 720 |
| 33-38 | 100/200 | 8 | 170 | 70 | 900 |
Advantage
SM-20 Power Fuses, rated 200 amperes continuous, utilize SM-20 Fuse Units. These fuse units are offered in a variety of ampere ratings, in five different speeds fuse link type “K,” Standard, Slow, Very Slow, and “DR.” They provide interrupting ratings of up to 14,000 amperes symmetrical at 60 Hz.
SM-40 Power Fuses, rated 400 amperes continuous, utilize SM-40 Fuse Units. These fuse units are similarly offered in a variety of ampere ratings, in four different speeds — fuse link type “K”, Standard, Slow, and Very Slow. They provide interrupting ratings of up to 25,000 amperes symmetrical at 60 Hz.
This broad selection of ampere ratings and speeds permits close fusing to achieve maximum protection and optimum coordination. SM-20 and SM-40 Power Fuses are manufactured in accordance with a quality system certified to ISO9001:2000.
Location
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.
Packaging
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FAQs
01. Manufacturer Offering Competitive Pricing and High Quality.
We are a direct-sales manufacturer offering both competitive pricing and high-quality products, helping you gain a foothold in the market—specifically in Wenzhou, Zhejiang Province, China. You are warmly invited to visit our company.
02. OEM/ODM Services.
We are a manufacturer backed by an exceptional and highly collaborative team.
03. Standard Payment Terms.
We accept various payment methods, including Telegraphic Transfer (TT) in advance, Letters of Credit (L/C), Western Union, and others. Please feel free to contact us if you have any questions!
04. Warranty Period.
1.5 years. Any quality issues will be resolved through free replacements included with your next order.
05. Free Samples.
Yes, we provide samples of smaller products for your quality assessment; you are only required to cover the courier fees.
