Transcription of Understanding Time Current Curves - Maverick Technologies
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Understanding Time Current Curves - Maverick Technologies
WHITE PAPER Understanding time Current Curves . Understanding time Current Curves David Paul , Engineering Design Manager, Maverick Technologies A time Current curve (TCC) plots the The orange curve is the transformer damage curve. The green Curves are the cable damage Curves . Each one interrupting time of an overcurrent of these items will be explained. The system represented device based on a given Current level. by this curve is well coordinated and adequately protected These Curves are provided by the from damage. It also has minimal Arc Flash hazard category ratings due to low instantaneous circuit breaker trip values. manufacturers of electrical overcurrent interrupting devices such as fuses and The One Line Diagram and TCC curve show a typical hypothetical circuit breakers. These Curves are part industrial power system (Figure 2). There is a utility delivery of the product acceptance testing point with power supplied at a medium voltage level (In this case 4160 volts), which feeds the primary side of a power required by Underwriters Laboratories transformer through a medium voltage fused switch containing (UL) and other rating agencies.
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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