HH
SIBA HV fuses are suitable for:
• • • • • • • • • • • • • •
Indoor switchgear, air and gas-insulated Outdoor switchgear Overhead lines Service under severe climatic conditions Installation in oil-insulated switchgear
Installation inside distribution transformers under oil
Features of the SIBA HV fuses:
Reliable sealing system against humidity, dust and corrosion Free of ageing Low power losses and respectively low temperature rise High breaking capacity Fast current limitation Low switching voltage High service reliability because of advanced controlled fabrication process Many decades of positive field experience
3 Standards SIBA HV fuses comply with the following standards:
• • • • • •
IEC 60282-1 and VDE 0670 Part 4: High voltage fuses Part 1: Current-Limiting Fuses IEC 60787 and VDE 0670 Part 402: Selection of current-limiting fuses for transformer circuits DIN 43625: High voltage fuses rated voltages 3.6kV up to 36kV IEC 60644 and VDE 0670 Part 401: Requirements for HV fuses for motor circuit applications IEC 60549: High voltage fuses for external protection of power capacitors IEC 62271 Part 105: Alternating current switch-fuse combinations
4 Technical Variables
The technical datum are based on tests which were accomplished to the appropriate national or international standards in accredited test laboratories or in the company laboratory. If not otherwise indicated, the datum were acquired with an ambient temperature of Ա& - 25ºC in calm air. The tests were done with new fuses, without preloading and from a cold condition.
Time-current characteristics
The operational behavior of the fuse is defined by its time-current characteristics and is given as the arithmetic average of a set of electrical tests plotted on a double logarithmic diagram. The general tolerance of the characteristic is ± 10% in the of the current. The broken line indicates that the fuse is not able to interrupt over currents in this range.
Cut-off current diagram
The diagram serves to determine the maximum cut-off current as a peak value, depending on the possible prospective current. Determined values, refers to an operating frequency of 50 cycles. Higher frequency of operation leads to higher values of cut-off current and lower frequencies of operation lead to lower values.
Melting and Operating Integrals
The datum apply to the current-limiting range of the fuses with fusing times lower than10ms. If not specifically designated, the melting integral is given as a minimum value and the operating integral is indicated as a maximum value. The values of the operating integral are usually indicated for the rated voltage of the fuse. Lower load voltages leads to smaller values of the operating integral.
Power dissipation (loss)
The power loss (heat) which is converted by the fuse loaded with its rated current under specified conditions. Indicated document values can possibly differ remarkably from actual measured values, as different installation conditions are not considered.
portal: www.siballc.net e-mail: info@sibafuse.com
10
Made with FlippingBook - Online magazine maker