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Power Distribution Applications The MiriAD 2000 units have been applied in unique solutions for power distribution monitoring and control applications. The in-built RS232 ports and supported protocols allow connection to a variety of power monitoring products to be monitored remotely. Values such as kWh, kV voltage, CB breaker operations, sensor failure, CT Amps etc. are all readily transferred to the MiriAD 2000 device for wireless transmission ot other remote connection. Miri is also able to develop wireless devices to specific customer requirements. The MiriAD 2001 ECU modules are an example of this. The I/O interface for the standard MiriAD 2000 module was modified to monitor 3 phase voltage and current and to measure phase angle on 3 phase distribution feeders in several remote rural 33kV feeder power systems. An example of the system layout is shown below: Additional features of the AD2001 were to continuously monitor fault conditions to cause the AD2001 ECU to trip a locally connected circuit breaker. Each of the conditions illutsrated below are automatically logged to the Event Log and forwarded to the Master Station via the wireless link when polled by the Master Station. Excessive Current Draw Excessive Transformer Temperature Oil Level Low Temperature Sensor Fault Oil Level Sensor Fault Circuit Breaker Fault There is also a state machine running continuously running within the AD2001 ECU managing Circuit Breaker trips, automatic re-closing, reset lockouts, etc. Events which will trip the Circuit Breaker are: excessive line current draw high transformer temperature low oil level oil temperature sensor fault oil level sensor fault The following conditions are logged to the local data-log memory. excessive line current draw high transformer temperature low oil level oil temperature sensor fault oil level sensor fault Circuit Breaker fault CB Open CB Close CB Tripped CB Locked Out CB open failed CB close failed CB opened on command CB closed on command The following table lists the event code values and descriptive text shown in the Event Log that is read back by hand held terminal devices: CB_tripped CB closed CB opened CB locked out CB reclosed CB closed on cmd CB opened on cmd CB close cmd failed CB open cmd failed Temperature. sensor open Temperature sensor shorted Oil sensor fault Line fault Temperature too high Oil Level low Should you have specific applications where you feel that modified MiriAD 2000 products may assist please contact us to discuss your requirements further.

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