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Evaluating Selective Coordination Between Current-Limiting Fuses and Non Current-Limiting Circuit Breakers
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From Ferraz Shawmut
System downtime is reduced when overcurrent protective devices are selectively coordinated. Designers should strive to limit the outage to only that circuit which is overloaded or which has faulted in order to avoid shutting down healthy parts of the electrical distribution system. Selectivity between overcurrent protective devices is generally desirable and may be mandatory. Traditional time-current curve analysis may not accurately portray the degree of selectivity existing when current-limiting overcurrent protective devices are involved [2]. This data sheet will discuss viable methods for evaluating selectivity between current-limiting fuses and non current-limiting circuit breakers. Products & Services
Fuses protect electrical devices and components from overcurrents and short circuits that occur in improperly operating circuits.
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Fuse holders are devices for containing, protecting and mounting fuses. Blown fuses can be changed quickly and easily when used in conjunction with a fuse holder.
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Specialty electrical distribution and protection products are specialty or proprietary products related to electrical distribution and circuit protection.
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Topics of Interest
13.1 Protective Relay Systems
The basic function of protection is to detect faults and to clear them as soon as possible. It is also important that in the process the minimum amount of equipment...
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5.6 Co-ordination with Fuses
When co-ordinating overcurrent relays it may be necessary to consider the time/current characteristics of fuses which are used to protect MV/LV substation transformers.
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5.1 General
Very high current levels in electrical power systems are usually caused by faults on the system. These currents can be used to determine the presence of faults and operate protection...
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Overview
A wide variety of equipment is used to protect distribution networks. The particular type of protection used depends on the system element being protected and the system voltage level, and,...
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7.1 Introduction
Where fuses are unsuitable or inadequate, protective relays and circuit breakers are used in combination to detect and isolate faults. Circuit breakers are the main making and...
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