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Medium Voltage Fuses
Product Information
These specially designed devices with proportional components switch on
the circuit where are placed with one or more components being fused
and switch off the circuit when a specific current value exceeds an
adequate perlod of time. These devices consist of ; A connecting
terminal , Fuse base (fuse fixing location), Fuse base contact ,
Replacer , Replacer contact , Fuse member , Indicator , Exciter.All components comprising the fuse mechanism are defined (as fuse stand and replacer) in the associeted standard. From the point of the user , a fuse generally means a replacer (fuse bushing).
Fuses are classified as "general-purpose" , "succesive " and " full-range" fuses according to the area of use depending on their current limiting properties
Fuses are protecting members that switch of huge short-circuit currents going through the faulty circuit by being fused due the heat energy generated by the fault current and also prevent recurring jumps by providing isolation. The function of fuses is to protect the equipment from dynamic and thermal affects that might be caused by short-circuit currents in the system. As they are affordable and do not require maintenance, mid-voltage switching stations are preferred to be protected with fuses against short-circuit and faultcurrents.
Intended for use ine OG distribution networks , ELOPAR-branded high-voltage fuses with fusible wire are suitable for indoor and outdoor used up to 36 kV , of current-limiting type and successive (back-up fuse) with high rupturing capecity in accordance with the Standard No. TS EN 60282-1/EC 60282-1 entitled "High-Voltage Fuses - Part 1: Current-Limiting Fuses" standard" and the Technical Specifications No. TEDAŞ-MYD/99-024A on High-Voltage Fuses with Fusible Wire.
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GENERAL INFORMATION
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A-ELECTRICAL PROPERTIES
Rated values:
Frequency : 50 HzCurrent : 2.4, 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80, 100A
Voltage : 7.2, 12, 17.5, 36 kV
Rupturing Capacity : 25 kA
B-STRUCTURAL PROPERTIES
Fuses consist of the following components:
1- BODY
The outer body of fuses with external and internal fusible wire are made from fireproof and non-combustible porcelain resistant to thermal stresses and mechanical strains. The surface is glazed , glossy and dust - and
dirt - repellent which is not affected by the atmospheric conditions , does not absorb water or humidty and is resistand to saits , acids and steam.
2-Replacer Contact (CAPS)
The caps enabling electrical contact in both ends of the fuses with fusible wire are connected to the body by the method of covering with adequate resistance , made from electrolytic copper and coated with 6 pm nickel and 4 pm silver , so as not to lead to excessive heating , and are designed to resist against mechanical and sealing strains due to extreme pressure.
3- CARRIER (ROD)
Made from ceramic materials. Wrapped up in silver wire or strip conformable to the rated current as the fusible member (fuse member), passing through the control cable of the indicator. Absorbs mechanical strains caused by the control cable in case of a short-circuit current, preventing them reaching directly the body.
4-FUSE MEMBER (FUSIBLE WIRE)
A fusible wire/string is the main component of high-voltage fuses. Made from silver wires or strips with a purlly of 99% In various cross-sections depending on the rated current as the fusible line and wrapped on the carrier (rod). Silver wires or strips are connected with copper members, which are also connected to the caps with spot welding.
5-EXTINGUISHING SAND
Quartz sand (99% purity) with arc-suspression property free from metals and humidity is filled in the body with a special machine so as not to have any air grap , ensuring it completely surrounds the current line.
6- INDICATOR AND EXCITER
The Indicator and exciter indicates the replacer (fuse bushing) has blown and provides the power required to activate the respective starting mechanism. The indicator and exciter is released after the silver wire or string and control cable are fused.
7- DIMENSIONS
The dimensions of the high-Voltage fuses with-fusible wire are as shown in the Technical Specifications No. TEDAŞ-MYD/99-024A on High-Voltage Fuses with Fusible Wire - Annex 3.
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