SIBA R-type high voltage limited fuse

Specifications

Design and construction

SIBA HV Fuse-links have parallel connected pure silver fuse-elements. The design and

method of production of the elements ensure narrow tolerances of time-curren characteristics.  

The fuse elements are wound on a ceramic support and are attached to the silver plated connection caps by means of spot-welding. The connection caps are fitted inside the silver plated copper end caps by spot welding. The copper end caps themselves are press-fitted onto the porcelain tube, which is glazed inside and outside.The end caps are mechanically fixed to the porcelain tube and additionally sealed by a durable elastic sealing medium. This sealing method has been proven over many decades of positive field experience and ensures tightness against ingress of humidity.

DIN                                 Rated Voltage                          Class                                                Standard
E=192 mm                    AC 3/7.2 kV                              Back-up                DIN 43625 · IEC 60282-1

Preferred Standard Size 3/7.2 kV

A  1.77” (45 mm)
F  1.30”  (33 mm)
O  0.40” (10 mm)
N  1.38” (35 mm)

Design

SIBA HV High Voltage Fuses  is mainly used in AC50HZ,rated voltage 3.6-40.5kv,rated current up to 200A circuit for protection transformers and power equipments from overload and short-circuit.It can also be used with load switch,vacuum contactor.
It conforms to IEC282-1,GB15166.2 and DIN standard. 

Striker pin

SIBA  HV  Fuse-links  are  available  with  striker  pins  of force:

•  80 N  (Part No. 30 … 13 for basic-type) and

• 120 N (Part No. 30 … 14 for variant-type)

The  characteristics  of  both  striker  pins  correspond  to IEC 60282-1, VDE 0670 Part 4, and are of the energy-

category “medium”.

The striker pin system is connected by means of a high  resistance parallel conductor. After melting the main fuse elements, the striker pin indicates the operating status of the fuse and actuates a microswitch for remote indication, and/or triggers a load break switch or a circuit breaker to open.

The  temperature  limiting  function  of the fuse striker pin

SIBA HV Fuse-links up to and including  160 A with a  striker  pin  of 80  N  are  equipped  with  an  integrated temperature limiter as standard. The temperature limiter is fitted inside the striker pin system. The SIBA striker pin  system therefore includes the following functions:

• thermal protection of adjacent equipment, especially SF6 insulated switchgear

• limitation of failure current at the overload region

Higher temperatures on plastic fuse enclosures in SF6 -insulated switchgear can be caused by:

• selection of a fuse rating too low for proper transformer protection

• fuses loaded with fault currents below the minimum breaking current

• deterioration  of  fuse  links  caused  by  transient  fault  currents (e.g. lightning strike)

• transformer fault currents (e.g. winding short-circuit) 

• additional temperature rise because of poor clip fitting Fuse-links  with  an  integrated  temperature  limiter  are compatible  with  standard  fuse  links.  All  coordination schedules can be used. Further  information  on  our  temperature  limiter,  design  and  construction,  can  be  obtained  from  our  website:      

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