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Ayob Nazmy Nanyan
Preferred name
Ayob Nazmy Nanyan
Official Name
Ayob Nazmy, Nanyan
Alternative Name
Nanyan, Ayob Nazmy
Nanyan, Ayob Nazmi Bin
Nanyan, A. N.
Main Affiliation
Scopus Author ID
57201667197
Researcher ID
FNW-5877-2022
Now showing
1 - 9 of 9
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PublicationSeries Arc Fault Detection Sensor Based on an ABS Rogowski Coil in Medium Voltage( 2022-01-01)
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PublicationThe magnetic flux density of various geometries of Rogowski Coil for overvoltage measurementsOvervoltage phenomenon is the common problem that always occurs in the power system and can cause the electrical system network breakdown, and in some cases, it may explode. The frequent overvoltage also can affect and degrade the lifespan of the electrical power system components and network. Thus, the overvoltage sensor is needed to overcome this problem matter. The Rogowski coil (RC) is one of an inductive coil group, and it is suitable for measuring the alternating current (AC) and transient currents or overvoltage. This paper demonstrated the effect of RC magnetic flux density, B with difference cross-section, geometries sizing and the number of turns by using Finite Element Method (FEM). Commonly, there are three types of RC widely used; rectangular, circular and oval. Each of these cross-sections has different characteristics in term of performance. The results have shown that the rectangular cross-section is better than oval and circular cross-section based on the number of magnetic flux density.
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PublicationApplication of D-STATCOM to mitigate high inrush current during start-up of three-phase induction motor( 2014)This thesis presents the application of Distribution Static Compensator (D-STATCOM) to mitigate inrush current during start up three phase induction motor. Three phase induction motor draws high current during starting period and will from 6 to 7 times of the rated current of the motor. The effect of high starting current will cause severe damage to motor itself, especially overheating and making motor life expectancy short. In addition, the high starting current will cause the voltage of the power supply rapid drop and affect other devices’ running in the same power line. The purpose of this thesis is to demonstrate that a D-STATCOM is capable to mitigate inrush starting current during start up induction motor. The controller circuit of D-STATCOM has been simulated by using Power System Computer Aided Design (PSCAD/EMTDC) software. The research methodology of this project is to design D-STATCOM circuit which consists of Voltage Source Converter as a main circuit. The function of this circuit is to convert AC to DC and then invert DC to AC before transmit to the threephase power line. The circuit’s has a capability to absorb and inject the reactive and active of the power system which is to control the magnitude of the VSC output voltage. To compare the capability of the D-STATCOM, a Soft starter is developed. The Soft starter circuit is controlled by six thyristors. There were three methods which can be used such as starting the induction motor with direct start-up, starting the induction motor by connecting with the D-STACOM and starting the induction motor with Soft starter. The starting currents of these three methods were observed up to 30 milliseconds and compared. The analysis result shows that the D-STATCOM had mitigated inrush current during start-up induction motor up to 74% higher compared to direct start-up and 164 Ampere is the highest inrush current recorded while direct startup was 637 Ampere recorded. The D-STATCOM was compared with Soft starter to determine the ability of reducing inrush current during start-up induction motor. The result shows that the D-STATCOM had mitigated of 54.3% higher inrush current compared with Soft starter. Hence, the conclusion of this research is the D-STATCOM has a higher capability to reduce inrush current during start up the induction motor compared with Soft starter.
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PublicationDevelopment of inductive coil sensor based on Rogowski coil for arcing fault in medium voltage (MV) measurement( 2020)Arcing fault overvoltage is one of the most common problem that always occur in both low voltage (LV) and medium voltage (MV) systems. The arc fault overvoltage in high voltage system is the most dangerous which can easily cause explosion of electrical components such as cable, transformers, switchgears and other equipment. The cause of arc fault overvoltage is due to the loosen cable termination at bus bar and transformers terminal, cable jointing and others. In order to reduce the arc fault risk, the arc circuit interrupter (AFSI) technology and arc fault detectors (AFD) have been developed. However, these devices are more suited for LV or domestic application. For applications in medium voltage (MV), a new arc fault sensor is needed to overcome this problem. Frequent arcing fault overvoltage can cause an interruption of the electrical system which may breakdown the system. Thus, to overcome this matter, the arcing fault sensor was developed in this research. The Rogowski coil (RC) which is one of the inductive coil group was selected as the arc fault detection sensor. Finite Element Method (FEM) was used for electromagnetic flux density, B analysis on RC geometrical and number of turns effect by modelling three different types of RC which are the rectangular, oval and circular cross-section. Based on FEM simulation results, the rectangular cross-section of RC had the highest electromagnetic flux density among the circular and oval cross-section. The mutual inductance calculation of rectangular cross-section has also been performed and compared to the FEM simulation results. There were seven (7) rectangular cross-section RC sensor prototypes that were fabricated using three-dimensional (3D) printer with various number of turns ranging from 20 to 100 with the cross-sectional area ranging between 200 mm2 and 1050 mm2. The acrylonitrile butadiene styrene (ABS) material was selected as the RC sensor core because it has low conductivity, categorized as an insulator, adequate rigidity, good thermal stability, exhibit high toughness even in cold conditions, chemical resistance, environment stress cracking and excellent mechanical properties. The sensor performance verification in terms of sensitivity and bandwidth was conducted with an experimental measurement that was done in the high voltage lab. Based on the experimental results, the RC sensor prototype RC2A5 (fabricated in this research) which has the highest number of turns (100 turns) produced excellent sensitivity at 0.56 kV/mA. However, the bandwidth of RC2A5 descended to 3.51 MHz which is the lowest bandwidth. Whereas, by reducing the number of turns to 20, the RC sensor prototype RC2A1(fabricated in this research) ascended to 7.93 MHz which is the highest bandwidth, but its sensitivity drops rapidly to 0.30 kV / mA. From the obtained results, it can be concluded that that the lower number of turns produced better bandwidth for the RC sensor but reduces the sensor sensitivity significantly. The best RC sensor developed in this work was proposed to be used as an arc fault overvoltage measuring sensor for the future.
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PublicationDevelopment of detachable Rogowski Coil current sensor using PCB for High Voltage cable partial discharge measurement( 2022-01-01)
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PublicationDevelopment and Performance Analysis of the Rogowski coil sensor for Arcing Fault Measurement( 2020-03-20)
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PublicationA Contemporary Review of High Voltage Partial Discharge Detection and Recognition Techniques( 2023-07-01)
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PublicationCurrent Sensor Based on Planar Rogowski Coil( 2021-01-01)
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PublicationPartial discharge detection performance using multi-cylindrical slots antenna with parasitic suppression patch for power transforme( 2022-01-01)
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