| Model Difference |
Effects on DMS/OMS Functionality |
| Model Difference |
Effects on DMS/OMS Functionality |
| Graphical representation -schematic or geographic |
From the network switching operation standpoint, a graphical user interface is essential, whether the graphical representation is schematic or geographic. A schematic model may provide better clarity for the dispatcher or operator to make switching decisions. However, particularly if landbase data is available, the geographic model presents significant additional benefits: it helps the dispatcher associate noncustomer calls (e.g., police or fire department) with customer outage calls and direct crews to network equipment locations. Priority: Very high, geographic if landbase data is
available. |
| Secondary network model |
For utilities that have extensive secondary networks, e.g., most European utilities and some U.S. utilities serving major urban areas, modeling the secondary allows the operator to isolate problems on the secondary and allows
DMS/OMS to track outage statistics in a finer resolution. Priority: Low for most North American systems, medium for most European
systems. |
| Three-phase connectivity model |
The three-phase connectivity model allows the calculation of customers affected by phase, e.g., the number of customers affected by blowing a single-phase tap fuse. The three-phase details are especially important to North American utilities that have extensive single-phase and two-phase circuits. The phase information will also support other important distribution engineering functions such as phase balancing. Priority: High for most
utilities |
| Model of spans in addition to device connectivity |
Modeling the connectivity of only switching and interruptible devices is adequate for basic OMS if the utility does not perform temporary operations like line cuts and jumpers. On the other hand, including spans in the model would not only support the occasional line cut and jumper operations, but also pave the way for OMS to track storm damage assessments and for DMS to perform loading and voltage analyses as part of the switching and control function. Priority:
High |
| Model Difference |
Effects on DMS/OMS Functionality |
| Including facility attribution in the network model |
Facility attribution is not strictly needed for a good OMS model. However, adding key facility attributes to the connectivity model has additional benefits. The dispatcher will be able to tell the crew what type and size of equipment may need to be replaced. The equipment characteristics such as ampacity and impedance will also allow DMS to perform loading and voltage analyses as part of the switching and control function. The attribution in the facility model will support asset management, planning and engineering functions. Priority:
Medium |
| Without device internals versus with device internals |
Device internals are useful in modeling complex network objects like substation equipment, switch cabinets, and automated transfer switches. They are also useful in providing a clearer graphical user interface for switching these objects in a geographic representation of the primary network. In addition, because most Supervisory Control and Data Acquisition
(SCADA) controlled devices are in these internals, modeling the internals become a must for SCADA –
DMS/OMS integration. Priority: High |
| Landbase information |
The landbase information helps the dispatcher locate noncustomer calls and associate them with customer outage calls. When coupled with a geographic-referenced network model, it helps the dispatcher direct crews to network equipment locations. More frequently, government authorities are requesting utility reliability reports by geographic and political areas, e.g., townships and streets, not by substations and circuits. The landbase information will help such reporting. Furthermore, the landbase information is an essential reference for maintaining the as-built network data. Priority: Very
High |
