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Protective Device Coordination

 

 
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Electrical protective devices for distributed power systems consist of fuses
Fuse (electrical)

In electronics and electrical engineering a fuse is a type of overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows, which breaks the electrical network in which it is connected, thus protecting the circuit's other components from damage due to excessive current....
, circuit breakers, relay
Relay

A relay is an electrical switch that opens and closes under the control of another electrical circuit. In the original form, the switch is operated by an magnet to open or close one or many sets of contacts....
s and other types of devices typically designed to interrupt the current flow in an electrical power system. Protective device coordination is the process of determining the "best fit" timing of current interruption when abnormal electrical conditions occur. The goal is to minimize an unexpected but necessary power outage to the smallest extent possible.

Historically, protective device coordination was done on translucent log-log paper.






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Electrical protective devices for distributed power systems consist of fuses
Fuse (electrical)

In electronics and electrical engineering a fuse is a type of overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows, which breaks the electrical network in which it is connected, thus protecting the circuit's other components from damage due to excessive current....
, circuit breakers, relay
Relay

A relay is an electrical switch that opens and closes under the control of another electrical circuit. In the original form, the switch is operated by an magnet to open or close one or many sets of contacts....
s and other types of devices typically designed to interrupt the current flow in an electrical power system. Protective device coordination is the process of determining the "best fit" timing of current interruption when abnormal electrical conditions occur. The goal is to minimize an unexpected but necessary power outage to the smallest extent possible.

Historically, protective device coordination was done on translucent log-log paper. Modern methods normally include detailed computer based analysis and reporting.