Fuse의 원리 및 선정 방법 - 도일코리아

FUSE CHARACTERISTICS

60269 part 4) If application does not meet this condition – derate current rating Example: - 200A square body fuse is mounted onto a busbar with cross sectional area 120mm2 - 2Minimum cross sectional area for 200A fuse: 200/1.3 = 154mm-120mm2 is only 70% of IEC recommended size - Thermal connection factor – 0.96

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Molded Case Circuit Breaker Selectivity Guide

Breaker (MCB) for proper coordination in main (primary) and branch circuits. You can choose either Selective Protection or Back-up Protection based on these tables in this publication. The values represent the maximum current [kA], and breaking capacity according to IE C 60947-2 applied for 400/415V AC systems.

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Overcurrent Protection & Coordination for Industrial ...

Nov 03, 2015 · Curves Coordination Time Intervals (CTIs) Effect of Fault Current Variations ... • Service Continuity & Selective Fault Isolation 13.8 kV 480 V 13.8 kV/480 V 2.5 MVA 5.75% ... Mtr Fuse 15 kA @ 4.16 kV . Coordination Time Intervals (CTIs) Slide 36

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Fault Current Calculations and NEC Requirements

• Do short-circuit current study and coordination study • Use time current curves to identify types and options of CBs required to achieve selective coordination (select breaker needed eliminate overlap of curves for fault current available) • Even small changes in fault current can result in lack of compliance Short-Circuit Current Study By

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GEH-702 Users Manual Spectra RMS Molded Case Circuit …

GEH-702 Users Manual . Spectra® RMS Circuit Breakers with microEntelliGuardTM Trip Unit. The microEntelliGuardTM Trip Unit is the latest and most advanced trip unit available in the Spectra line of molded case circuit breakers. The trip unit design is …

FUSEOLOGY - Littelfuse Fuse

is pulse cycle withstand capability and the second is selective coordination. 2. Pulse Cycle Withstand Capability Electrical pulses produce thermal cycling and possible mechanical fatigue that could affect the life of the fuse. For this reason, it is important to know the pulse cycle withstand capability of the fuse, which is defined as the ...

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Understanding Time Current Curves - Maverick Technologies

The curves allow the power system engineer to graphically represent the selective coordination of overcurrent devices in an electrical system. Modern power system design software packages such as EasyPower, SKM Power Tools, and Etap contain graphical libraries of curves to allow the power system engineer the ability to plot, analyze and print

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OVERCURRENT COORDINATION GUIDELINES FOR …

Overcurrent Coordination Page 3 Qual-Tech Engineers, Inc. 8. Fuse - Relay coordination requires a minimum 0.3 second time margin between the curves. 9. Low Voltage Breaker - Fuse coordination requires a minimum 0.1 second time margin between the curves to allow for temperature variations in the fuse.

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