Explains about the complete detail of scada functions

1. SCADA FUNCTIONS
B.SANGEETH KUMAR-(15K016)

2. TECHNICAL FUNCTIONS OF SCADA
Some basics function of SCADA are discussed below
• Data acquisition
• Supervisory control
• Tagging
• Alarms
• Logging (Recording):
• Load shading
• Trending

3. DATA ACQUISITION
• The basic information of the power system collected is called
the Data Acquisition. The data is collected by means of CTs,
PTs and transducers. It provides the telemetry measurement
and status indication to the operator
• Scanning rate:
1 sample/2 seconds
• As new Values come in from the RTUs/IEDs old values are
overwritten. Measurements and Status Indications Collected are
stored in a Real Time Database.

4. • Data acquisition is the function of the SCADA which is
required to perform the following functions:
•It is used to read the power system data from 100-250 RTU
into the control center.
•It detects and handle the error conditions of RTU and
communication link as well as.
•It can be used to check the limits such as high/low operating
limit, thermal limits, and safe handling limits.
•It can be used to convert the analog data into the binary data.
•It stores only the error free data in the data b/c erroneous data
causes the failure of program.
•It can interface with the data base manager, which generated
the data address where data can be stored in data base.
•It completes all above tasks in less than 2 seconds

5. SUPERVISORY CONTROL:
• It enables the operator to remotely control the devices.
For example open and close of the circuit breaker.
Tagging:
• It prevents the device from unauthorized operation.
Means it authorizes the device to perform the specific
operation
Alarms:
• It informs the operator about the unnecessary events
and undesired conditions.

6. Logging (Recording):
• It logs all the operating entry, all alarms and other
information. In other words it keeps the record of all the
events.
Load shading:
• It provides both the automatic and manual control
tripping of load during the emergency.
Trending:
• It plots the measurement on the selected time scale.

7. • It plots the measurement on the selected time scale.
• The SCADA system enables the operator to attain the complete knowledge
of the system in a single room by means of display.
• Almost all the SCADA systems are computer based (Digital computer). This
computer is located in the master unit. The master unit is the heart of the
SCADA system, it comprises many of the i/p and o/p equipments to receive
and send the control message from and to the RTU.