EA-PSM Electric
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  • 14. AUTOMATIC OVERCURRENT RELAY COORDINATION

14. AUTOMATIC OVERCURRENT RELAY COORDINATION

 
           In order to use this functionality, open one-line network diagram on EA-PSM. Place breakers  from elements list on the branches, where overcurrent protection relays should be added.
 
 
 
           In this example of the functionality implementation is shown. In the network, 5 overcurrent protection devices are connected in line. In order to choose optimal parameters for these devices, open “Relay coordination” table, by selecting “Optimize” from the main menu bar and then “Relay coordination”. The table will open as shown:
 
 
           Explanation of coefficients of “Default reserve values” are provided in 10.11. Configuring circuit breaker protection. “Default precision values” are current transformer and relay winding precision in percents. Sensitivity values are explained in 10.4. Configuring non-direction overcurrent protection. The user can choose inverse-time or definite time protection type.
           In “Breakers” tab the user can select particular breakers that are already placed in the network, the software will optimize trip units only for selected breakers. In this example, all five breakers from the first picture are selected. Results of fully automatic relay optimization are provided in the following picture.