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1. Automation of 11 kv Substation using
Raspberry pi
ABSTRACT
Electricity plays an inevitable role in the development of the nation. In the
conventional methodology, substation automation is done by using PLCs and
SCADA systems, but for a small substation automation, this system is considerably
expensive. This project adopts low cost automation solutions based on recent IOT
technology using embedded processors like raspberry pi for automation of a small
11 kV substation. This gives the advantage of cost reduction plus a plethora of
connectivity options. In this paper, Codesys IEC 61131-3 software is used to
convert a Raspberry pi as a soft PLC. Analog and digital parameters from field are
monitored and controlled using GPIOs pins, interfacing relays and communication
ports available in raspberry pi. The automation sequences for control monitoring
and protection of the system is defined using ladder diagram programming in IEC
61131-3 Codesys development platform. User interface and HMI screens are
developed using Codesys web visualization segment which can be accessed both
locally as well as over a wired or wireless network.
EXISTING SYSTEM
Substation automation is the process of automatically controlling the process
parameters in the electrical substation with the help of automation devices.
Considering the present global scenario automation has become a factor of outmost
importance in all the fields of engineering like manufacturing processes, process

2. control in plants etc. Implementation of automation in electrical substations has
eased as well as improved the efficiency and safety of all the substation processes
like power generation, transmission and distribution. The conventional method of
implementing the substation automation is by using SCADA (Supervisory Control
and Data Acquisition) and PLC. SCADA system is more popular than other control
system in the modern industrial processes. There are four main elements in
SCADA based electrical distribution system. They are automated control system,
interfacing units, monitoring system and networking system. The automated
control system can be accomplished by using PLC ladder diagram. This automated
distribution system is analyzed to develop a secure, reliable and convenient
management tool which can use remote terminal units (RTUs).
PROPOSED SYSTEM
In recent times the automation at the substation is done by the use of
programmable logic controller (PLC) and Supervisory Control and Data
Acquisition (SCADA) instead of electromechanical devices (1). But these are quite
expensive. The Prime aim of this project is cost reduction, this can be achieved by
replacing PLC with Raspberry Pi.
The Raspberry Pi can be a good substitute for PLC which is cheap and is
more user-friendly. This Methodology mainly focus on automation of 11kV
substation operations, metering and data management thus to create a user friendly
environment between user and machines. For this Raspberry pi is used as the main
processing unit. Substation automation is done by using Codesys IEC 61131-3
software. CODESYS Control for Raspberry Pi SL contains a CODESYS Control
application for Raspberry with all necessary drivers. Using this software Raspberry
Pi can be used as substitute for PLC in substation The IEC 61131-3 automation

3. software has established itself firmly in Industrial Automation. The Raspberry Pi is
a series of credit card-sized single board computers. Ladder diagram is used in
Codesys to implement Pi as PLC. Codesys has WebVisuation segment which
enables the user to create User friendly HMI display. Raspberry pi downloads the
program from the CODESYS platform. When pi is connected to a network it acts
as a server, devices connected to the same network can access the web
visualization using the IP address of pi. These devices acts as Remote Terminal
Unit, could monitor the substation activities from Mobile devices connected to the
network.