High voltage fuse links are used in medium voltage networks as for short circuit protection for several decades. They are designed and tested according to IEC 60282-1 and intended for protection of high voltage lines, motors,distribution transformers, capacitors,switching devices etc aganist thermal and dymanic effects which are caused by the current which exceeds the permitted value as regards amplitude and duration.

EKESİS high voltage fuses are economical,quick, easy to use and are a good solution for protection with regard to the price of the whole system. They are manufactured in accordance with IEC 60282-1,TS-EN 60282-1 and with dimenions according to DIN 43625 for outdoor and indoor stations with voltage ratings from 7,2kV up to 36kV. The successful KEMA type tests confirm the high quality standard of EKESİS high voltage fuse links. This constant high quality level is ensured through our Quality assurance management system which is certified in accordance with DIN ISO 9001 standard.

The construction of EKESİS high voltage fuse link is shown on the figure -1. The isolating body of the fuse links are made of high qualitative brown porcelain which is glaced inside as well as outside. The nickel or silver plated caps of electrolyte copper wich gives good resistance against corrosion are rolled by mechanically pressing into the groove of the porcelain tube and additionally sealed by a durable elastic which is resistant to ageing and high temperatures. This sealing method ensures tightness against ingress of humidity. Inside the porcelain tube there is a centrically installed an star-shaped ceramic support on which fuse elements are twisted around this ceramic support. These melting elements are attached on both caps by means of a special copper strip. Many melting elements are connected in a paralel way so that their thickness is as little as possible and this is one the conditions for the correct functioning of the melting element in case of overload of the current. Insıde of the tube is filled with a very pure quartz sand of predetermined grain size which enable to absorb the energy produced by arcing and in this way assures a high breaking capacity.

The fuse link is equipped with a striker system , which is an important element in the construction. The striker pin is activated immediately when the fuse element melts and fıunctions as an optical indicator or with it’s force it actuates some switching device. Dimensions and characteristics of the force diagram are shown on the figure-2. Back-up fuse links are intented for protection in a limited current region from the minimum breaking current (Imin) to the rated breaking capacity (I1). These fuse links have been a standart product of EKESİS for many years and constant quality of the product is guaranteed by a quality management system installed at EKESİS which assures qualitative product and a reliable protection. 
 

PPROPERTIES

EKESİS H.V. FUSE LINKS HAVE THE FOLLOWING OUTSTANDING ADVANTAGES

• Reliable interruption of critical current,
• High breaking capacity,
• Reliable interruption at minimum breaking curent,
• Low power loss and temperature rise,
• No protuberant metal parts , which could case discharges,
• Reliable time-current characteristics,
• Equal desing for indoor and outdoor stations,
• Qualitative melting elements resistant to ageing,
• Reliable operation of the striker system,
• Routine tests for components and completed fuse links,
• Production in according to the quality assurance system(DIN ISO 9001).

TRANSFORMER PROTECTION

To safely protect transformers in distribution networks back-up fuse links are used in most cases. The fuse ratings recommended for the relevant transformer rating are given in fuse selection table (table-1) for selection of fuse links for transformer circuit applications.

TABLO 1 / TABLE 1 TRANSFORMATÖRLER İÇİN SİGORTA SEÇİM TABLOSU FUSE SELECTION TABLE FOR TRANSFORMERS Nominal Gerilim (kV) Rated Voltage (kV) TRAFO NOMİNAL GÜCÜ (kVA) TRANSFORMER RATED CAPACITY (kVA) 25 50 75 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 Uk= 4% Uk= 5% Müsaade edilen kısa devre süresi = 2 sn. / Limit of short circuit time = 2 sec. Yüksek Gerilim Sigorta Anma Akımı (A) / H.V. Fuse Links Rated Current (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) min (A) max (A) 6 6 10 16 16 25 20 30 25 40 30 50 40 63 50 80 63 100 80 125 100 160 125 200 160 200 200 250 250 250 315 315 400 400 4 6 6 16 10 16 16 20 16 25 20 30 25 30 30 50 40 63 50 80 63 100 80 125 100 125 125 160 160 160 200 200 250 250 4 6 6 10 10 10 10 16 16 20 16 25 20 25 25 30 25 30 25 40 30 50 40 63 63 80 80 100 100 100 125 125 160 160 4 6 6 6 6 6 10 10 10 16 16 20 16 20 20 25 20 25 25 40 30 50 40 63 50 63 63 80 80 80 100 100 125 125 2 6 4 6 6 6 6 6 6 10 10 16 10 16 16 20 16 25 16 25 25 30 30 40 40 50 40 50 50 63 63 80 80 100 6 / 7,2 10 / 12 15 / 17,5 20 / 24 30 / 36