Understanding SCADA Measurements
There are three possible types of SCADA measurements that SCADA Extensions can display:
• Analog - Numeric measurements of the distribution system operating conditions at SCADA devices, such as amps, kVAr, and volts.
• Status - Binary values, such as OPEN/CLOSE and ON/OFF. Status values related to switches are mapped into the topological status of switchable devices that affect the energization of the distribution model. Other status values, such as reclose, enabled, loop scheme indication, lightning mode, and fault indicators, are displayed as text pairs of symbols.
• Digital - Whole-integer value measurements indicating the state of the device, such as tap positions or counters. The NMS SCADA ICCP Block 1, 2, and 5 Adapter does not currently support digital whole-integer measurements. However, these values can be available if converted through a custom adapter into engineering values.
Understanding Measurement Quality Codes
Quality codes provide information about the quality of the measurement coming from the SCADA system. Examples may include held, suspect, not valid, telemetered, calculated, entered, estimated, abnormal, off scan, SCADA error, and tag on. Additionally there are quality codes that may be applied to a SCADA measurement from the NMS applications. These include alarm inhibited and manually overridden.
The following quality codes are internal codes created and maintained by the NMS:
The following additional quality codes may be configured and modified to be supplied by the Oracle Utilities NMS SCADA ICCP Block 1, 2, and 5 Adapter: