FUSE LINK
JOULE SENTRY
Fault currents
The overloads and short circuits can cause:
- Damages in the transformer and electric equipments.
- Problems with fuse coordination.
- Lack of electric quality service.
- Costly maintenance personnel maneuvering.
- Financial losses.
Some features
Eutectic silver alloy helical fuse element.
We assured its functionality by PRESSING and SOLDERING the terminals.
Our fuses operate with a 10% TCC.
Our tubes are manufactured using vulcanized fiber.
Our tubes handle overloads as well short circuit faults.
We comply with the overload tests and arc extinction conditions.
Guaranteed compliance with the ASTM D-635 flammability standard.
Our terminals and washers are silver coated.
Our washers do not deform when the circuit breaker is closed.
Eléctricos Internacional has an accredited laboratory under
the ISO/IEC 17025:2017 standard where it performs tests described in
the IEEE C37.42/2016 standard.
Reliability at all levels of electrical intensity. WE MANUFACTURE expulsion fuses for open circuit cutouts of 15, 27 y 38 Kvs
NOMINAL CURRENT:
6H, 6K,6M, 6T, 7VS & 6.3SR
Protective devices such as fuses have well-defined operating characteristics that relate fault magnitude to operating time. The magnitude and duration of fault currents are of utmost importance in establishing a coordinated protection practice for transformers, as both the mechanical and thermal effects of fault currents should be considered.
Fuses that use replaceable fuse links work as
a system to interrupt the full range of possible fault currents.
TIME - CURRENT characteristics
ABILITY TO HANDLE THE DIFFERENT FAULT CURRENTS
Fuse links standard IEEE C37-41- 2016
Generally, the gas-evolving tube that surrounds the fuse element (termed the arc quenching tube or,commonly, “auxiliary tube”) provides for the expulsion action at low currents, while the fuseholder provides for the expulsion action at high currents (when the auxiliary tube “bursts”).
As per IEEE C37.42.2016 expulsion fuse link manufacturers have to comply with the TCC as per paragraph 6.6. The curves reflect two different types of faults, the overloads and the short circuit. The auxiliary tube
should be able to handle both types of faults and avoid any
possible burning commonly associated with the use of plastic materials specially when the fuse element has a helicoidal geometry. See photo 1
The proper way of handling the whole spectrum of different faults rely on the use of proper materials during the manufacturing of the auxiliary tube. Even though the world of plastics has improved tremendously over the last decade, the high temperatures developed in proximity to the fuse element, make them a poor choice of materials specially when in contact with high temperature alloys for the fuse wires. That's why we keep relying on the use of vulcanized fiber with enough thickness and way of construction to proper handling the so common faults.
See photo 2.
The proper way of handling the whole spectrum of different faults rely on the use of proper materials during the manufacturing of the auxiliary tube. Even though the world of plastics has improved tremendously over the last decade, the high temperatures developed in proximity to the fuse element, make them a poor choice of materials specially when in contact with high temperature alloys for the fuse wires. That's why we keep relying on the use of vulcanized fiber with enough thickness and way of construction to proper handling the so common faults.
See photo 2.
Fuses for distribution transformers should accomplish the following:
- Fuses for distribution transformers should accomplish the following:
- Provide maximum protection to the transformer from through faults, with the degree of transformer protection determined by comparing the appropriate time current curve for the fuse selected with the appropriate transformer short time loading curve; both curves need to be properly adjusted to reflect differences between primary and secondary phase currents and winding currents associated with the specific transformer connection involved and the type of possible faults in the secondary circuit.
- Provide earliest possible detection and clearing of internal transformer faults.
- Permit loading the transformer to the maximum loading practice of the user.
- Withstand combined transformer magnetizing inrush and load pickup current after short time (up to 1 minute) or extended time (30 minutes and longer outages).
- Properly coordinate with over current protection devices on the secondary of the transformer.
- For small residential transformers (25 kVA and lower), withstand surge discharge through a grounded primary winding whose magnetic circuit has become saturated by a long time lightning induced surge.
- For residential transformers with a fuse located ahead of a surge arrester at the transformer, withstand the potential surge current that may be discharged through the arrester.
Learn more about our fuse links
Eléctricos Internacional S.A.S., with 40 years of experience in the manufacture and commercialization of products used in electrical distribution, has taken up the work of Dr. Guy Combeau and his wife Blanca de Combeau, becoming the standard bearer for the diffusion, research and improvement of their products. Thanks to the experience acquired and the research carried out in the laboratory, they have realized that there is no guide and reference material that can be used for the proper handling of expulsion fuses.
