Short Circuit and Coordination

Short-circuit calculations are an essential component of a coordination study. Short-circuit results establish the minimum and maximum current levels at which coordination must be achieved. They aid in setting or selecting the devices for adequate protection.

A coordination study minimizes the hazards to personnel and equipment, with the least disruption of power service.

Coordination studies:

Select or verify the clearing characteristics of devices in the protection scheme, such as fuses, circuit breakers, and relays

Determines the settings for protective devices that are required for selective fault isolation.

In a properly coordinated system, a fault will interrupt only the minimum amount of equipment necessary to isolate the faulted portion.

Whenever your facility is changed or upgraded, you revisit your protection scheme to determine whether it should also be updated to ensure that devices are coordinated

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