Automatic Transfer Switch Control Panel

Abstract

In Addressing the challenge of power outages, this paper introduces a diesel generator (DG) as a reliable backup power source. The centerpiece of the system is an automated transfer switch, meticulously engineered to transition power sources seamlessly. This automation is crucial for eliminating human error and ensuring swift action during power failures. The transfer switch, crafted predominantly from relays, underwent rigorous testing on a breadboard to ensure flawless operation. The design process was methodically segmented into three distinct phases: the power supply unit, the voltage comparator, and the switching mechanism. Each phase was individually tested and then meticulously assembled onto a printed circuit board (PCB). This innovative paper delivers a cost-effective and high-performing solution, ideal for both urgent and routine standby applications, ensuring continuous power supply with minimal interruption.

Introduction

I. INTRODUCTION

An Automatic Transfer Switch (ATS) is an essential component in power management systems, designed to seamlessly switch the electrical load between two power sources, such as from a primary source like the utility grid to a backup generator, without manual intervention. The ATS ensures continuous power delivery by automatically activating the backup source when it detects an interruption or failure in the primary source. It employs a combination of electromechanical relays, contactors, voltage monitoring relays, and delay timer relays to monitor power conditions and execute the transfer process. This intelligent device is crucial for maintaining uninterrupted power supply in critical applications, providing both safety and convenience.

The Automatic Transfer Switch Control Panel is engineered to provide a fail-safe mechanism that ensures a continuous power supply. By automatically toggling between the primary power grid and a secondary source, such as a generator, during outages or voltage fluctuations, it plays a vital role in protecting sensitive equipment and maintaining operations in essential services. This system is not just a technical achievement; it’s a crucial component that upholds the resilience of our most important facilities. The project underscores the value of smart engineering solutions in bolstering the stability and efficiency of electrical systems.

The paper is a strategic initiative aimed at enhancing power management systems. The primary goal is to create a reliable and efficient mechanism for the automatic transition of electrical power between the main supply and a backup source. Key objectives include:

1. Developing a User-Friendly Interface: To allow easy monitoring and management of the power transfer process.
2. Ensuring Reliability and Safety: To provide stable power transitions and safeguard against supply interruptions.
3. Minimizing Downtime: To reduce the impact of power outages on operations.
4. Enhancing Operational Resilience: To strengthen the system’s ability to withstand power fluctuations.
5. Simplifying Maintenance: To make upkeep procedures more straightforward and less time-consuming.
6. Incorporating Advanced Automation: To optimize energy management, enhance fault detection capabilities, and offer real-time analytics.

The paper aspires to set a benchmark in the industry by delivering a high-performance control panel that not only meets but exceeds user expectations and industry standards.

The current problem highlights the inconvenience and time-consuming nature of relying on a manual transfer switch during power outages. The need to manually start the generator and switch the power source not only causes delays in restoring electricity but also poses safety concerns in navigating the dark. An automatic transfer switch (ATS) can address these issues by instantly detecting power loss and switching to the backup generator without human intervention, then reverting to the main power supply once it’s restored. Implementing an ATS can significantly improve response time during outages, enhance safety, and provide a more reliable power continuity solution.

In the context of low voltage distribution systems, load categorization based on importance is a critical aspect of ensuring power reliability and safety. Here’s a summary of the load classifications:

a. Normal Loads: These include everyday utilities like lighting and electrical outlets, which are solely dependent on the main power source. If the main power fails, these loads will not receive power.

b. Emergency Loads: Essential services such as emergency lighting and elevators fall under this category. They are primarily powered by the main source but are backed up by an emergency generator. The Automatic Transfer Switch (ATS) system facilitates the switch to the backup source during a main power outage.

c. Important Loads: Critical operations, particularly in healthcare settings like surgery rooms and intensive care units, require multiple layers of backup. They can be powered by the main source, an emergency generator, and an Uninterruptible Power Supply (UPS). In the event of a failure in both the main source and the emergency generator, the UPS takes over through a Transfer Switch (TS). Given the critical nature of these loads, a brief downtime during the TS transition is acceptable. For such applications, automatic transfer switches, specifically static switches, are preferred due to their rapid response times. This structured approach to power distribution ensures that each type of load receives the appropriate level of power security, reflecting the load’s importance and the potential impact of power interruptions.

II. METHODOLOGY

In The ATS ensures that the electrical load receives a continuous power supply by automatically switching to the power generator when the mains supply is interrupted, and vice versa. This system is crucial for maintaining uninterrupted power in critical applications such as hospitals, data centres, and other essential services. The use of relays, contactors, and control logic within the ATS allows for this seamless transition between power sources as shown in fig.1. It typically includes the following components:

1. Electrical Load: This is the recipient of the power, which could represent a building or a specific area that requires electricity.
2. ATS Circuit: This is the central component that automatically switches the power source from the mains supply to the generator in case of a power outage.
3. Mains Supply: Represented by high voltage towers, this is the primary source of power, usually from the public utility grid.
4. Power Generator: This is the secondary or backup power source that is used when the mains supply fails.

The block diagram shown in fig.2, depicts an electrical control system designed to manage power distribution between two sources. Here’s an explanation of its components and their functions:

a. Power Sources: “Source 1” and “Source 2” represent the primary and secondary power supplies, respectively. These could be the main grid and a backup generator.

b. MCBs (Miniature Circuit Breakers): Each power source is connected to an MCB, which protects the system from overcurrent’s and short circuits.

c. Contactors: “Contactor 1” and “Contactor 2” are electrically-controlled switches used for switching the electrical power circuit. They connect the power sources to the load.

d. Load: This is the consumer of the electricity, such as a building or machinery.

e. Relay Module: It acts as an intermediary, receiving signals from the voltage sensor and controlling the contactors to switch the power source.

f. Voltage Sensor: It monitors the voltage levels of the power sources and sends signals to the relay module.

g. Current Sensor: Positioned after the contactors, it measures the current flowing to the load.

h. Controller: This device manages the overall operation of the system, processing inputs from the sensors and making decisions accordingly.

The system ensures that the load receives a continuous power supply by automatically switching between the two sources based on the data received from the sensors, managed by the controller. The use of a relay module allows for quick and efficient switching, minimizing downtime for the load.

III. WORKING PRINCIPLE

To convert a single-phase AC supply voltage to a 5V DC supply for an Arduino, you can follow these steps:

1. Step-Down Transformer: Use a step-down transformer to reduce the 220V or 230V AC supply to a lower AC voltage level, closer to the desired DC level.
2. Bridge Rectifier: Connect the output of the transformer to a bridge rectifier, which converts the AC voltage to a pulsating DC voltage.
3. Smoothing Capacitor: Place a smoothing capacitor after the rectifier to filter out the fluctuations in the rectified voltage, resulting in a smoother DC signal.
4. Voltage Divider: Implement a voltage divider circuit to further bring down the voltage to the required 5V level. This can be done using a pair of resistors.
5. Buffer Amplifier: Finally, connect a buffer amplifier with unity gain to stabilize the voltage at 5V. The operational amplifier should be powered with a dual supply, typically ±15V, to ensure proper operation.
6. Voltage Measurement: Measure the output voltage across the buffer amplifier with a DC voltmeter to confirm it is at the desired 5V level.
7. Arduino Operation: With the voltage regulated to 5V, the Arduino can now be powered up and begin its operation.
8. Relay Signalling: At the power station, the Arduino can signal the relay to shift the load as programmed.

As shown in the fig.3, this circuit ensures that the Arduino receives a stable 5V DC supply, which is essential for its reliable operation. The relay can then be used to control the load as needed. Remember to always follow safety precautions when working with electrical circuits.

IV. ADVANTAGES AND APPLICATIONS

A. Advantages

1. High Sensitivity: Arduino-based ATS systems can be highly sensitive to changes in power supply, ensuring quick and accurate switching.
2. Phase Availability: They work effectively according to the availability of power phases.
3. Low Cost: Arduino components are generally inexpensive, making the ATS system cost-effective.
4. Reliability: The use of Arduino ensures a reliable circuit that can handle the switching process efficiently.
5. Manpower Elimination: The automation provided by Arduino eliminates the need for manual intervention during power switches.
6. Heavy Load Handling: Arduino-based ATS systems can handle heavy loads, making them suitable for a variety of applications.

B. Applications

1. Residential and Commercial Buildings: Ensuring uninterrupted power supply for critical systems like lighting, security, and HVAC.
2. Healthcare Facilities: Providing a reliable power source for essential medical equipment.
3. Data Centres: Maintaining continuous operation of servers and networking equipment.
4. Industrial Settings: Automating power source switching for machinery and production lines.
5. Telecommunications: Ensuring the reliability of communication networks.
6. Renewable Energy Systems: Integrating with solar or wind power systems for efficient energy management3.

Conclusion

In summarizing the research, the document outlines a novel strategy for the creation of an intelligent Automatic Transfer Switch (ATS) system. This system is particularly beneficial for areas with recurrent electrical disruptions. The ATS is designed to automatically transition between the primary electrical grid and alternative power sources like inverters, utilizing relays to facilitate this process effectively. The system’s performance, validated through comprehensive testing and development of prototypes, shows an efficiency rate of 66.3% and is capable of handling loads up to 10 amps. This positions the ATS as an economical option for both emergency and standby power scenarios. Prospective improvements could include the adoption of switching power supplies to enhance efficiency. In essence, the ATS stands out as a dependable and proficient mechanism for the management of electrical outages, ensuring a consistent supply of power.

References

[1] Muneer, A.; Amjad, F.; Jabbar, M.W.; Saleem, U. Development of Automatic Switch for Electric Power Transfer. Eng. Proc. 2021, 12, 72. https://doi.org/10.3390/engproc2021012072 [2] Tekale, Anil, and Swapna God. \"Charge Pump Circuit Based Grid-Tied PV System for Single Phase Transformer Less Inverter Using Fuzzy Logic Controller.\" Techno-Societal 2020: Proceedings of the 3rd International Conference on Advanced Technologies for Societal Applications—Volume 2. Cham: Springer International Publishing, 2021. [3] R. M. Ramli and W. A. Jabbar, “Design and implementation of solar-powered with IoT-Enabled portable irrigation system,” Internet of Things and Cyber-Physical Systems, 2022, https://doi.org/10.1016/j.iotcps.2022.12.002. [4] Swapna P. God, Anil Tekale and Mallareddy C. ?Control Scheme Based on Quasi Z-Source Network for Four Switch BLDC Motor? International Journal Research and Development 5.7 (2017): 461-464 [5] Tekale, A., God, S. (2021). Charge Pump Circuit Based Grid-Tied PV System for Single Phase Transformer Less Inverter Using Fuzzy Logic Controller. In: Pawar, P.M., Balasubramaniam, R., Ronge, B.P., Salunkhe, S.B., Vibhute, A.S., Melinamath, B. (eds) Techno-Societal 2020. Springer, Cham. https://doi.org/10.1007/978-3-030-69925-3_8 [6] P. Asghari, A. M. Rahmani, and H. H. S. Javadi, “Internet of Things applications: A systematic review,” Computer Networks, vol. 148, pp. 241-261, 2019, https://doi.org/10.1016/j.comnet.2018.12.008. [7] Y. Bouzembrak, M. Klüche, A. Gavai, and H. J. Marvin, “Internet of Things in food safety: Literature review and a bibliometric analysis,” Trends in Food Science & Technology, vol. 94, pp. 54-64, 2019, https://doi.org/10.1016/j.tifs.2019.11.002. [8] Tekale, Anil, Ashwini Kumar, and Swapna God. \"Automatic Fault Detection and Protection of Three Phase Induction Motor.\" (2018). [9] Z. Hisham Che Soh, M. Azeer Al-Hami Husa, S. Afzal Che Abdullah, and M. Affandi Shafie, “Smart waste collection monitoring and alert system via IoT,” ISCAIE 2019 - 2019 IEEE Symp. Comput. Appl. Ind. Electron., pp. 50–54, 2019, https://doi.org/10.1109/ISCAIE.2019.8743746. [10] J. Bhookya, M. V. Kumar, J. R. Kumar, and A. S. Rao, “Implementation of PID controller for liquid level system using mGWO and integration of IoT application,” Journal of Industrial Information Integration, vol. 28, p. 100368, 2022, https://doi.org/10.1016/j.jii.2022.100368. [11] W. A. Jabbar, C. W. Wei, N. A. A. M. Azmi, and N. A. Haironnazli, “An IoT Raspberry Pi-based parking management system for smart campus,” Internet of Things, vol. 14, p. 100387, 2021, https://doi.org/10.1016/j.iot.2021.100387. [12] R. N. Hasanah, S. Soeprapto and H. P. Adi, \"Arduino-Based Automatic Transfer Switch for Domestic Emergency Power Generator-Set,\" 2018 2nd IEEE Advanced Information Management,Communicates,Electronic and Automation Control Conference (IMCEC), 2018, pp. 742-746, https://doi.org/10.1109/IMCEC.2018.8469629. [13] Tekale, Anil, et al. \"Implementation of Fuzzy Based Grid-Tied PV System for Single Phase Transformer Less Inverter with Charge Pump Circuit Concept. “.” (2019). [14] A. Kurniawan, A. Taqwa, and Y. Bow, “PLC Application as an Automatic Transfer Switch for on-grid PV System; Case Study Jakabaring Solar Power Plant Palembang,” Journal of Physics: Conference Series, vol. 1167, no. 1, p. 012026, 2019, https://doi.org/10.1088/1742-6596/1167/1/012026.

Copyright

Copyright © 2024 Prof. God Swapna, Bhosale Nandini, Mardhekar Nikita, Kambire Akanksha, Bendgude Komal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.