Articles

Design and build an Arduino-Based Inverse Time and Constant Time Overcurrent Protection Relay

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This study discusses the design and implementation of a overcurrent protection system using two types of relays, namely Inverse Time Overcurrent Relays and Constant Time Overcurrent Relays based on Arduino Uno microcontrollers. The system is designed to detect and respond to overcurrent disturbances that occur at resistor loads using current sensors, relay modules, and LCD displays. In an inverse time system, the disconnection time depends on the magnitude of the interference current, where the larger the current, the faster the relay works. On the other hand, in a constant time system, the relay will cut off the current at a predetermined time, regardless of the size of the current. The Arduino Uno acts as a controller brain that processes data from the current sensor and determines the disconnection logic. The test was carried out to evaluate the relay working time characteristics of the interference current variation as well as the effect of the multiplier factor value on the disconnection speed. In addition, the system is also equipped with a PZEM-004T CT module for real-time monitoring of electrical parameters and a 16 2 LCD display as a user interface. The test results show that the system is able to work effectively according to the characteristics of each type of relay. This prototype offers a practical and economical solution in the simulation of electrical protection systems, particularly in microcontroller-based learning and development environments.​

Analysis of OCR and GFR Coordination on the 20 kV Cubicle at Mosad Office Tower Samarinda

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The distribution system is a component of the electric power system responsible for delivering electricity from the transmission network to consumers. This system generally utilizes medium voltage levels, which are more susceptible to faults compared to transmission systems. To mitigate disturbances in the distribution network, protection equipment is employed. Commonly used protection devices include the Overcurrent Relay (OCR) and the Ground Fault Relay (GFR). Coordination between the OCR and GFR is essential to ensure the protection system functions optimally, possesses adequate selectivity and sensitivity, and maintains the continuity of electricity supply. This paper discusses the coordination settings of the overcurrent and ground fault relays. Simulations were conducted using ETAP 19.0.1 software based on field data. Calculation results on the feeder indicate an OCR grading time of 0.489 seconds, whereas the field data shows 0.4 seconds. For the GFR, the grading time on the feeder is 0.297 seconds, compared to 0.4 seconds from the field data. These values indicate that the protection coordination within this system can be considered ideal.

Design and Construction of the Standard Inverse and Constant Time Overcurrent Relay Simulator Based on Arduino

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Overcurrent relay as one of the protection systems in the electricity distribution network has been improved in performance through the implementation of microcontrollers. To simulate the work of overcurrent relays, an Arduino module based on Atmega328P can be used to study the working algorithm of overcurrent relays. This research aims to design and build  an Arduino-based overcurrent relay simulator  with two working time characteristics, namely standard inverse and constant time. The simulator is equipped with a CT-based current sensor and a PZEM-004T module to read the current, as well as using a 20×4 I2C LCD and  a 4×4 Keypad as the user interface. Once the simulator is designed, the next step is testing to measure the accuracy of the sensor readings and the performance of the relay at various variations of current and timing settings. The test is performed at a voltage of 220 Volt Alternating Current (AC) and at a variety of current variations i.e., 0.5 A, 1 A and 1.5 A currents.  The test results showed that the system was able to work according to the characteristics of standard inverse and constant time with an average  error of measurement of the relay working time  of less than 2% for standard inverse and 0% for constant time. This proves that this Arduino-based overcurrent protection system is accurate and responsive.

Arduino-Based Overcurrent Relay Design with Very Inverse Type

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The protection system is a very important system in the electric power system, because this protection system functions as a safety for electrical equipment from abnormal events or disturbances. In this study ever current relay is used as a protection system, over current relay works based on the current value measured by the PZEM-004T current sensor. The value of the current sensor will be output from the arduino to the relay module, so that the relay will work according to the current limit setting that will be progammed on the UNO arduino as a command to the relay module to break or connect the current in the circuit. The current value and the state of the overcurrent relay will be displayed on the LCD that receives input from the arduino Uno. Very inverse type overcurrent relay (OCR) is one type of OCR that has a longer trip delay time for smaller fault currents and faster at large currents. This allows the system to aperate again faster after a small disturbance. This research aims to design and build dan Arduino-based very inverse type OCR. The system uses PZEM-004T current sensor to detect the current and Arduino Uno microcontroller to process the data and control the relay. The characteristics of the trip delay time of the very inverse type OCR are programmed according to the IEEE C37.122 Standard. With TMS values ranging from 0.01 to 13 seconds. The programme is given setting current value of 2 Amperes and a TMS value of 0.05 seconds. In the test carried out, it was found that the current and trip time were directly proportional to the simulation experiments in ETAP although there was still a slight difference in the tiime difference in current disconnection based on the comparison curve.