DRIESCHER Y WITTJOHANN, S.A. MEDIUM VOLTAGE SOLUTIONS TECHNICAL SPECIFICATION HIGH VOLTAGE CURRENT LIMITING FUSES
SECTION CONTENTS PAGE 1 General Features 3 2 Standards 3 3 Service Conditions 4 4 Characteristics 4 5 Construction 6 6 Technical Information 7 7 Tests 7 8 Marking 7 9 Packing 7
1.- General Features High voltage current limiting fuses DRIWISA type DRS and DRK are used in medium voltage systems from 4.16 kv up to 38 kv, fulfilling the followings applications: Independent protection elements when the fuses are installed in single pole and three pole fuse holders on air DRIWISA type SP and DSP. Combinations protections elements in vacuum, SF6 and air switches. Transformers, gears and underground cables protection. Potential transformers and capacitors banks protections (type DRK). High voltage current limiting fuses DRIWISA type DRS and DRK complies with the following requirements: Back-up fuses complain with the standards IEC 60282-1 y NMX-J-149-1. Fuses with a striker pin mechanism to operate other protection devices (DRS fuses). Fuses must not expel gases or any incandescent material that damage other equipments during the fuse operation (short circuit). In outdoors facilities the fuses shall be safeguarded against moisture. High voltage current limiting fuses DRIWISA type DRS and DRK can be installed in medium voltage indoor and outdoor compact substation and in air lines using DRIWISA fuse holders with outdoor fuses. 2.- Standards High voltage current limiting fuses DRIWISA type DRS and DRK comply with the following Standards: NMX-J-098 NMX-J-068 NMX-J-149/1 IEC 62271-1 IEC 62271-103 IEC 62271-105 IEC 62271-200 IEC 60273 IEC 60282-1 ANSI C37.22 Sistemas eléctricos de potencia-suministro-tensiones eléctricas normalizadas Tableros de alta tensión Fusibles alta tensión-parte 1: cortacircuitos - fusibles limitadores de corriente Common specifications Switches for rated voltages above 1 kv and less than 52 kv Alternating current switch-fuse combinations Ac metal-enclosed switchgear and controlgear for rated voltages above 1 kv and up to and including 52 kv Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 v High-voltage fuses - Part 1: Current-limiting fuses Preferred ratings and related required capabilities for indoor ac medium-voltage switches used in metal-enclosed switchgear IEEE STD C37.20.4-2001 Standard for indoor ac switches (1 kv 38 kv) for use in metal-enclosed switchgear
3.- Service Conditions High voltage current limiting fuses DRIWISA type DRS and DRK are able to operate within the range of the following environment conditions. Temperature: -10 ºC / +40 ºC. Relative Humidity: < 60% Altitude: 0-1000 msnm * *For higher installation heights must apply the appropriate correction factor. (IEC 60694) The enclosure, metal enclosure substation or board, must have the appropriate NEMA or IP degree protection to secure the specified temperature or humidity conditions and keep the inside air free of smoke, gases, water, corrosive or explosive steamers and electrically conductive particles (dust). IEC 60529 NEMA 250 Degrees of protection provided by enclosures (IP Code) Enclosures for electrical equipment (1000 volts maximum) 4.- Characteristics 4.1- Dimensions High voltage current limiting fuses DRIWISA type DRS and DRKcomplain with the following dimensions. Type DRS Dimensions in mm Ø A B Ø C 2 (minimum) Ø C 1 y C 2 (maximum) 45 33 50 88 e 192 292 442 537
Type DRK Dimensions en mm Ø A B Ø C 2 Ø C 1 y C 2 e (minimum) (maximum) 45 33 50 88 192 292 442 537 4.2.- Nominal electrical capacities: Fuses cover the tension for 4.8 up to 38 kv: NOMINAL (A) CURRENT MAXIMUM VOLTAGE(kV) 4.8 7.2 12 13.8 17.5 25.8 38 1 2 4 6 10 16 25 32 40 50 63 75 100 125 + + 150 + + + 160 200 + + + 250 + + + 315 + + + 400 + + + 500 + 630 + DRS Y DRK + DRS
5.- Construction High voltage current limiting fuses DRIWISA type DRS and DRK are mainly constructed with the following elements: a) Fuses elements b) Star-shaped body c) internal support d) voltaic extinguish arc e) contacts f) striker pin g) seals 5.1- Fuses Elements The fuses are formed of one ore several 99.9% pure silver strips are uniformly wound over a star shaped strip-holder (star-shaped body) built out of steatite (a ceramic material with great mechanical and thermal resistance). 5.2- Porcelain Body Due to its tooth edge design, the star-shaped body guarantees the fuse links safe and firm position. It doesn t have conductive materials over the body. 5.3- Internal Support. Internal support with tooth edge design to support the silver strips and guaranty the distance between each other, ceramic support for high temperatures and high mechanical resistance to support thermal stress and electrodynamics short circuit. 5.4- Voltaic Extinguish Arc El interior del cuerpo aislante y alrededor del soporte interno, que mantiene fijos los elementos fusible, están llenados de arena sílica para el enfriamiento y extinción del arco voltáico y provocando la condensación y solidificación del metal evaporado durante el corto circuito; este material esta libre de humedad y no es producto de un proceso de reciclado. 5.5.- Contacts 5.5.1.- Type DRS Are made of electrolytic cooper (99.9%) plated with 5 µm with 80% minimum of contact area. The contacts are designed with the standards in Section 2 and the dimensions in section 4.1 5.5.2.- Tipo DRK Are made of electrolytic cooper (99.9%) plated with 5 µm with 80% minimum of contact area, brass caps with a ½ UNC threads en each sizes. The contacts are designed with the standards in Section 2 and the dimensions in section 4.1 5.6.- Striker pin (type DRS) Material is steel (brass) resistant to the same elevations in temperature of themetallic or conductive parts in base of the standards in section 2. The heavy striker pin (120 N) can used in the load break disconnector switches on air, vacuum or SF6 DRIWISA. 5.7.- Seals The fuse has seals that guarantee the tightness of the assembly, the seal does not allow the entry of dust and moisture (in fuses weather), not permits the expulsion of incandescent gases or materials that can damage the equipment near the time of a short circuit.
6.- Technical Information HIGH VOLTAGE CURRENT LIMITING FUSES 6.1.- Drawings Printed drawings as required can be provided in letter size, multiple letter size or electronic format (2D and 3D). 6.2.- Instructives Easily accessed on our website http://www.driwisa.com/instructions.htm. 7.- Tests 7.1.- Prototype test reports Reports of prototype tests performed in accredited national laboratories (LAPEM) that guarantee the fulfillment of the values and capacities specified in Section 4 Electrical Capacities. 7.2.- Routine Tests Routine test are done to each High voltage current limiting fuses DRIWISA type DRS and DRK. 8.- Marking Visual inspection dimensional analysis Ohmic resistance High voltage current limiting fuses DRIWISA type DRS and DRK contain a nameplate made of stainless steel material and has recorded the following information: Name of the manufacturer. Serial number. Type and model. Nominal voltage kv. Rated current A. Rated interruption current. Interruptive capacity ka Legend Made in México. 9.- Packing High voltage current limiting fuses DRIWISA type DRS and DRK is packaged individually in a box of adequate strength material to protect it during transport, handling and storage. Each package is marked on the outside with the appointment in accordance with section 8, identify the manufacturer and marked "Fragile, manéjese con cuidado".