Distribution Network Automation System Point Table

A DNAS point table catalogs all measurement, control, and status points in a distribution automation system, including analog, digital, and control points for feeders, transformers, and substations.

Overview of DNAS Points

A Distribution Network Automation System (DNAS) point table is a structured list of all the data points monitored or controlled within a distribution network. These points are essential for SCADA integration, automation, and real-time monitoring of the distribution system ( ).

Types of Points

Analog Points (AI/AV)Measure continuous variables such as voltage, current, power, frequency, and temperature. Examples: feeder current, transformer winding temperature, bus voltage ( ). Digital Points (DI/DV)Represent binary states such as breaker status, switch position, or alarm conditions.

Examples: circuit breaker open/closed, recloser status, capacitor bank on/off ( ). Control Points (DO)Used to send commands to devices for automation or remote control. Examples: open/close feeder breakers, switch capacitor banks, operate voltage regulators ( ).

Status/

Alarm Points

Indicate abnormal conditions or events in the network. Examples: overcurrent alarm, transformer overload, feeder fault detection ( ).

Typical Point Table Structure

A DNA

S point table usually includes the following columns: ColumnDescriptionPoint IDUnique identifier for each pointDevice/LocationSubstation, feeder, transformer, or capacitor bankPoint TypeAnalog, digital, control, or statusSignal DescriptionMeasurement or control functionUnitsVolts, Amps, kW, kVAr, or binary stateSCADA AddressMapping to SCADA or automation systemAlarm/ThresholdOptional limits for triggering alarmsIntegration with Distribution AutomationPrimary Substations: Points include high-voltage and medium-voltage measurements, breaker statuses, and transformer tap positions ( ). Feeders: Points include feeder current, voltage, breaker status, and fault indicators ( ).

Secondary Substations/

Industrial Consumers: Points may include transformer load, voltage regulation, and capacitor bank control ( ).

Best Practices

Standardize point naming conventions for clarity and interoperability. Include both real-time measurements and control points for automation. Map points to SCADA or DMS systems for monitoring, control, and historical data logging ( ).

In summary, a DNAS point table is a comprehensive reference for all analog, digital, and control points in a distribution network, enabling effective automation, monitoring, and management of substations, feeders, and connected loads. Properly structured point tables are critical for SCADA integration, fault detection, and operational efficiency.