All protective device shall be analyzed to provide optimum coordination and protection using time-current curves (TCCs) and displayed on log-log scale graphs. The TCC shall terminate the device characteristic curves at a point reflecting maximum symmetrical or asymmetrical fault current to which the device is exposed. Pertinent motor starting characteristics and motor damage points shall be displayed on the TCC where applicable. Generator short-circuit decrement curve and generator damage point, as applicable, shall be noted. A sufficient number of plots shall be provided to indicate the degree of system protection and coordination by displaying the time-current characteristics of series connected overcurrent devices and other pertinent system parameters, including transformer inrush and damage curves. A list shall accompany the TCCs and will contain descriptions for each of the devices and their settings based on the applicable TCC. A discussion section which evaluates the degree of system protection and service continuity with overcurrent devices, along with recommendations as required for addressing system protection or device coordination deficiencies, will be provided.
Protective Device Time-Current Coordination Analysis
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Point Eight Power has won numerous awards. Among them are the Supplier of the Year from the National Steel and Shipbuilding Company (NASSCO) in 2000; Cutler-Hammer's OEM Partner of the Year in 1996, 1997 and 1999; and recognition from Saudi Aramco in 1999/2000 for prompt delivery, outstanding team effort and performance contributing to our successful achievement of quality and schedule goals for the Hawiyah Gas Plant Project.
Contact Information
Address:
1510 Engineers Rd.
Belle Chasse, LA 70037
Phone:
800.284.1522
504.394.6100
504.394.6686
Email:
info@pointeightpower.com
1510 Engineers Rd.
Belle Chasse, LA 70037
Phone:
800.284.1522
504.394.6100
504.394.6686
Email:
info@pointeightpower.com