For consulting and plant engineers, protective device coordination software is absolutely critical for ensuring personnel safety and maximizing system uptime. The radial distribution system is the cheapest to build and is widely used in sparsely populated. Calculation tools for low voltage electrical network. In this webinar, david castor discusses issues related to protective device coordination using easypower software. In addition, the specifying engineer may list alternate manufacturers that are acceptable substitutions as long as they provide, as a part of the normal submittal process, a sealed and signed selective coordination study using the alternate equipment. To fulfill this requirement an overcurrent coordination study is required.
Etap star overcurrent device protection and coordination evaluation software provides an intuitive and logical approach to timecurrent characteristic curve selectivity analysis. How to achieve selective coordination of circuit breakers eep. Generator kilovolt amperes, size, voltage, and source impedance. Coordination study report including computer generated timecurrent characteristic curves tcc. The continuouscurrent rating of a fuse should be equal to, or slightly less than, the currentcarrying. Determining optimal size of superconducting fault current. Shortcircuit study an analysis of available fault currents in the power system is performed data collection in addition to the data collected for the shortcircuit study, additional information is gathered on present settings and ratings of all protective devices manufacturers data each protective device has unique response. Distribution transformer protection fuse coordination.
A new version of the coordinaide protection and coordination assistant software is now available for use. For fuse systems, verification of selective coordination is quick and easy. Standard lowvoltage ratings are 600, 300, 250, and 125 v. The coordinaide protection and coordination assistant software lets you quickly and easily select the optimal protective device e. Jul 23, 2015 a protection coordination study will consist of timecurrent curves tcc of all the electrical equipment, protective devices and large motors. Now at the push of a button all your fuse and circuit breaker curves are plotted and displayed for your complete installation and its easy to adjust. A typical kv feeder of several lines at a distribution substation is shown in figure 1. Etap star offers insight into troubleshooting false trips, relay misoperation, and miscoordination. Overcurrent coordination setting guidelines transformers. The cooper bussmann group motor protection guide program is a quick and easytouse program that will tell you if. Evaluating selective coordination between currentlimiting. This is why hundredsofthousands of people have watched, liked, subscribed, and left positive comments on youtube channel.
Electrical systems commonly use fuses and circuit breakers to protect electrical equipment such as conductors, transformers, motors, and other components. Overcurrent device lookup tables and system design guide. If software is used to perform the selective coordination study, input all the data in the system first and run a fault analysis. The program is capable of generating all the necessary study benchmarks.
See the response to the question about who should do the coordination study above. Cyme international software, protective device coordination. Facilities instructions, standards, and techniques volume 39. This tutorial teaches the design of a protection coordination scheme for a power distribution network using etap. Typically the fuse will cross the transformer damage curve. For fuse systems, verification of selective coordination is quick and easy, merely adhere to fuse ampere rating ratios as indicated by the manufacturer. It should be noted that the study of timecurrent curves indicates performance during overload and lowlevel fault conditions. Cyme power engineering software protective device analysis.
The new fusesaving philosophy described in this paper offers several improvements over conventional practices by extending the range of coordination, minimizing miscoordination with downline devices, and eliminating unnecessary tripping. Guide to power system selective coordination 600v and below document number 0100db0603 2. This type of coordination is therefore mainly used in end distribution with low rated current and shortcircuit current values and high impedance of the connection cables. The contractor shall furnish shortcircuit and protective device coordination studies as prepared by.
Oneline diagram obtain the electrical system oneline diagram that identifies important system components, as given below. Overcurrent coordination page 3 qualtech engineers, inc. Hitech transguard ext os shorty fuse white paper us. Using stateoftheart technology, models, and software, our teams apply their knowledge throughout all phases of the project life cycle. A new notification for transformer damage curve device indicates how other device tcc curves are affected. This is supplied from a 115 kv line through a 152025 mva transformer protected by a highside fuse. Overcurrent device protection and coordination evaluation software. Home download center electrical software available fault current selective coordination spreadsheet.
Protect transformers against damaging overcurrents and coordinate with primary and secondaryside protective. The program performs a search based upon electrical or electronic fuse, the voltage rating, ac or dc, timedelay or fastacting characteristics, and the available fault current, if known. Doing so implies relying on the use of timecurrent curves tccs, but the information presented on tccs alone may be insufficient to determine selective coordination see the post selective coordination with molded case circuit breakers. Shortcircuit study an analysis of available fault currents in the power system is performed data collection in addition to the data collected for the shortcircuit study, additional information is gathered on present settings and ratings of all protective devices. The selective coordination analysis tool provides you with the ability to select combinations of circuit breakers that provide total selective coordination. Design of protection coordination of a distribution network. Transformers obtain the following data for protection and coordination infor. Now, get the job done in no time with onetouch automation from smartpdc the revolutionary productivity tool from easypower. Not only does cyme provide the useful tools listed above to make any study. The program performs a search based upon electrical or electronic fuse, the voltage rating, ac or dc, timedelay or fastacting characteristics, and the amp range, fuse class, fuse family, fuse series. Coordination analysis for a typical kv distribution. Draganddrop layout, maintaining all the easypower oneline features. Protective device coordination the cymtcc software addresses time overcurrent protection for industrial, commercial and distribution power systems.
A selective coordination study conducted before equipment installation will determine the proper configuration and show the impact of short circuits and overloads on facility operation. Eatons cymtcc software addresses time overcurrent protection for. Display the timecurrent curves of 1 to 8 circuitbreakers. Circuitbreaker and fuse current ratings and types b. Coordination studies why do i need a protective device coordination study. How to achieve selective coordination of circuit breakers. The protective device analysis can be used to verify the coordination, the. Etap star tcc features are also demonstrated in it. To coordinate ocpd and cable we need to understand first how to read the circuit breakers timecurrent curve and the cables damage curve. An example of the protective device coordination procedure is provided for a 3phase, 50hp, 460v, 1. This is where you will find useful information for coordination studies and determining selectivity between overcurrent devices. Leach consultant, hitech fuses abstract this paper examines the ways that fuses are used to protect distribution transformers and the systems to which they are connected. The program performs a search based upon electrical or electronic fuse, the voltage rating, ac or dc, timedelay or fastacting characteristics, and the amp range, fuse class, fuse family, fuse.
Coordination study is very critical since the interval of the clearing the fault and the start of burning of the cable is just a matter of second or split of a second. Available fault current selective coordination spreadsheet. Design of protection coordination of a distribution. This tool provides circuit breaker selections that are fully rated and fully selective. Hitech energy limiting protection overhead case study us. In this post i will address some frequently asked questions and misconceptions regarding means for achieving high levels of selective coordination with molded case circuit breakers mccbs q. The program comes with an extensive database of over 15000 protective devices from more than 100 different manufacturers that are easily accessed to produce timecurrent curve plots and device. F2 represents our feeder fuse and f3 is the branch circuit fuse. Methods of performing a selective coordination study currently three methods are most often used to perform a coordination study. The cooper bussmann fuse selection guide program will help you select a cooper bussmann fuse based upon fuse characteristics. The total clearing time of the fuse should be use d for coordination purposes. A protection coordination study will consist of timecurrent curves tcc of all the electrical equipment, protective devices and large motors.
Thank you for your interest in selective coordination designer v1. If a failure occurs within this equipment, usually a short circuit results. Protective device coordination short circuit study. A protective device coordination study will show you the probable and possible values of fault currents within the system and show you impact short circuits and failures would have on your fuses, circuit breakers, and your facilitys operation. Introduction to protective device coordination analysis. Apr 06, 2011 presented by chuck nochumson and dave loucks. The time margin bet ween the fuse total clearing curve and the up 6 when lowvoltage circuit breakers e quipped with directacting trip units are coordinated with relayed circuit breakers, the coordination time in. To test the protection and coordination settings of this system by generating tccs.
The purpose of the protection coordination study is to verify that the various protection devices in your system, relays, breakers, fuses, etc. A quick and easytouse program to help you meet group motor protection requirements. To achieve selective coordination with fuses, the fuse ratio tables must be employed. Selective coordination is a design requirement newly added by both the 2005 and 2008 national electrical code to article 700 emergency systems see 700. Because a fuse is capable of interrupting a fault in its currentlimiting range in less than onehalf cycle i. Frequently asked questions about selective coordination. Relay coordination study and analysis is performed to make sure that safety operation of the system are functioning correctly and to avoid the nuisance tripping, as protection is a major concern in any industry and they rely on protective devices for the same. Loglog plot to display timecurrent curves of protective devices such as fuses, relays. Electrical engineers use powertools to perform harmonic analysis, transient stability analysis, short circuit analysis, and to determine demand load, voltage drop, arcflash hazard analysis and protective device coordination. If our system is selectively coordinated, f3 will clear the fault before either f2 or f1 opens. For fuse systems, 600v or less, use the published selectivity ratios which are presented in the next section for cooper bussmann. The elite software ecoord program aids in the selective coordination of fuses and circuit breakers by providing an. The device timecurrent trip curves are generally used for the study.
Low voltage breaker fuse coordination requires a minimum 0. Ecoord fuse and breaker coordination huge builtin library of devices. Besides revealing curve overlaps, ecoord can also analyze the melting and clearing i. A comparison of the time it takes protective devices to operate when certain levels of normal or abnormal current pass through them. With builtin data for over 2,000 individual devices already builtin, all you have to do is select the devices you want from the list and youre ready to go. Mar 15, 2016 if software is used to perform the selective coordination study, input all the data in the system first and run a fault analysis. Jun 28, 2018 this tutorial teaches the design of a protection coordination scheme for a power distribution network using etap. For fuse systems, 600v or less, use the published selectivity ratios which are. Because of this capability, fuse manufacturers are able to publish a set of fuse coordination ratios, which will guarantee selective coordination at any fault level. An optimized composite phase and ground fusesaving tcc curve is. Creating tccs with software is a very simple procedure, but achieving the desired level of coordination can be difficult.
Our selective coordination lookup tables are quick and easy to use. Introduction with the inclusion of new language in the 2005 national electrical code nec, the requirements for selective coordination of electrical power systems are, at present, more stringent than. An organized timecurrent study of protective devices from the utility to a device. Take a quick tour of etap star protective device coordination module. Ecoord fuse and breaker coordination elite software. The bussmann series fuse selector tool is an online application that will help you select a bussmann series fuse based upon fuse characteristics. Device coordination getting started with etap star youtube. Selective coordination fuses figure 2 illustrates the timecurrent characteristic curves for two amp ratings of timedelay, dual. This solution is intrinsically rapid instantaneous, easy to implement and inexpensive. Differential, partial differential, ground differential, overcurrent, multifunction relays, and moreon the oneline diagram. When a fault occurs within any portion of the f3 branch circuit, the short circuit current will pass through f1, f2, and f3. Ecoord gets the job done right when it comes to analyzing timecurrent curves for overcurrent protection devices.
Selective coordination with circuit breakers iaei magazine. Electrical calculation tools schneider electric global. Guide to power system selective coordination 600v and below. Selective coordination is required for systems related to life safety as defined in the nec, and is achieved when an overcurrent on a circuit is interrupted and only the closest upstream device opens such that only the section of the electrical system with a problem is taken offline.
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