Recording and Reporting
Sub.net is a powerful Power Quality fault recorder and reporter with built in automatic analysis and event classifier. Sub.net is the only sub-station / power network monitor which carries out full analysis within each unit and sends auto-prioritised immediate graphical and numerical reports to the right people or M2M using whatever methodology is required.
Sub.net captures faults, disturbances and Power Quality, records, performs analysis on-site in real-time reporting.
The capture and understanding of fault events is vital to ensure the reliability and continuous operation of the power system. During a rapid series of fault events, sub.net gathers these together with an RMS recording into a single report document allowing easy interpretation of event sequences.
Long term trending analysis is also performed continuously, recording up to 26 weeks of measurements. This allows on-demand generation of trend records, which can provide insight into power system performance over periods from hours to months.
An embedded event classifier within sub.net provides automatic analysis of the recorded data resulting from system Threshold occurrence events and sends prioritised reports as emails.
Threshold occurrence event(s) are automatically captured from the circuit they came from allowing during fault and steady state conditions before and after to be examined in determining power system stability and functionality.
Classification enables rapid engineering assessments to be made and appropriate prompt actions to be taken. There is no longer any need for large volumes of data to be retrieved from multiple instruments to a centralised master station before information can be made available to users
Distribution Fault Location
Sub.net can report on the possible locations of a multi-phase fault in a distribution network. This uses a local impedance model of the outgoing circuits to list the distance to the nearest named nodes in the network. The model can also include an OS map reference and an asset database identifier. This information can be sent to the field crew within a matter of minutes which can improve the supply restoration time and hence reduce the Customer Minutes Lost (CML).
If an event is classified as a downstream fault an algorithm is used to identify the fault type and the phases involved. The fault impedance is then computed and this is looked up in the local model and the distance from named nodes is added to the event report.
If a local impedance model is not available the fault resistance listed in the event report summary may be used with a suitable digital mapping system to show the possible fault locations.
|836-02||0.291 km past Line 1052 Pole 17 08/2731/001/P-BRN SPUR (towards Line 1052 Pole 25 SPUR)||227701.44||330790.78||12531161|
|836-02||0.135 km before Line 1061 Pole 4 08/2730/001/P-CAU||227472.87||330594.95||10260873|
To maintain a secure and reliable electrical power supply – Information from the analysis of network events provides insight into the operation of the power system and assets.
One sub.net can monitor the conditions of a range of key assets within a substation.
It records every operation of every breaker in a switchyard and reports any problem immediately via email, fax or text message. Both mechanisms and main contacts are monitored.
Recognising early indicators of abnormal conditions
- CT and VT circuits supervision
- Interrupted fault current
- Protection relay operation
- Breaker operation timing and contacts monitoring
- Trip coil monitoring
- Station battery