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.
the short time delay setting moves the “knee” vertically up the time axis. Similarly, decreasing the settings moved the “knee” lower on the vertical axis. The described curve shifts are depicted on the TCC plots below. (Figures 4 - 7) WHITE PAPER UNDERSTANDING TIME CURRENT CURVES 3/6 Figure 4: Short Time Base Case STPU=2.5 ST DLY=Min
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