Mursalin's Workspace

Serving as the President of the Dhaka Association (2025-26) at Jashore University of Science and Technology (JUST) was a rewarding leadership experience that allowed me to contribute to a vibrant and supportive student community.

Although my tenure lasted for just over six months, I remained committed to creating meaningful experiences for members by organizing events, coordinating programs, and fostering stronger connections among students from the Dhaka region. Working alongside dedicated team members, I focused on building an inclusive environment where students could network, collaborate, and support one another throughout their university journey.

This role strengthened my leadership, organizational, and communication skills while teaching me the importance of teamwork, strategic planning, and community engagement. It also reinforced my belief that impactful leadership is measured not by the length of service, but by the positive influence it leaves on the people and the organization.

"Leadership is about bringing people together around a shared purpose and creating opportunities for others to grow. My time as President of the Dhaka Association strengthened my commitment to service, collaboration, and community development."

During my undergraduate journey at Jashore University of Science and Technology (JUST), I had the privilege of serving as the Dining Hall Manager of Munshi Meherullah Hall for one year.

This role was much more than an administrative responsibility—it was an opportunity to lead, solve real-world challenges, and contribute to the daily well-being of hundreds of resident students. Managing dining operations required effective coordination, decision-making, communication, and a strong commitment to maintaining service quality and discipline.

In recognition of my dedication and sincere service, I was honored to receive an Award of Appreciation from the Hall Authority and the Provost. This recognition serves as a reminder that consistent effort, accountability, and teamwork are always valued.

I am grateful to the Hall Authority, the Provost, and everyone I had the opportunity to work with for their trust and support.

"Leadership is not about holding a position; it's about taking responsibility and making a positive impact."

Single Line Diagram (SLD) is a simplified representation of a three-phase electrical power system using a single line and standard symbols. It shows the main components of a power system—such as generators, transformers, circuit breakers, busbars, and transmission lines—in a simplified manner.

A Lightning Arrester (LA) is a protective device that protects substation equipment from high-voltage surges caused by lightning or switching operations. It provides a low-resistance path to ground so that surge voltages are safely discharged without damaging equipment.

A Current Transformer (CT) is an instrument transformer that reduces very high current in the power line to a small, proportional current value that can be safely measured by meters and protective relays.

A Potential Transformer (PT), also called a voltage transformer, steps down high system voltage to a lower standard value suitable for measurement and protection.

A Capacitive Voltage Transformer (CVT) is used in high-voltage transmission systems to measure voltage. It works using a capacitive voltage divider to reduce very high voltage to a lower measurable value and is also commonly used for communication coupling in transmission lines.

Power Line Carrier Communication (PLCC) is a system used in substations where the power transmission line itself is used to transmit communication signals. It is used for telecommunication, protection signaling, and control between substations over long distances.

A Wave Trap (Line Trap) is used in PLCC systems to block high-frequency carrier signals from leaving the desired transmission path. It works as a low pass filter by eliminating high frequency signal and pass the power frequency.

An Isolator (Disconnect Switch) is a mechanical switching device used to isolate a part of the electrical system for maintenance or safety. It is operated only when the circuit carries no current and ensures complete disconnection of equipment from the power supply.

A Circuit Breaker (C.B.) is an automatic switching device used to protect electrical systems from faults such as short circuits or overloads. It can interrupt current flow under normal and fault conditions.

Sequence: L.A--->C.V.T--->ISO--->C.T--->C.B--->ISO

Star–Delta starting is a common method used to start a three-phase induction motor while reducing the high starting current. It is mainly used for medium and large motors.

1. Basic Idea

When an induction motor starts directly from the line (DOL), it draws a very large current (about 5–7 times the rated current). This can cause:

Voltage drop in the supply line
Overheating of windings
Stress on electrical equipment

To avoid this, the Star–Delta starter first connects the motor windings in star (Y) during starting and later switches to delta (Δ) for normal operation.

2. Working Principle

Step 1: Starting in Star Connection

The three stator windings are connected in star (Y).
Each phase receives $V_L / \sqrt{3}$ voltage instead of full line voltage.
Because the voltage is lower:
- Starting current reduces to about one-third
- Starting torque reduces to about one-third

Step 2: Running in Delta Connection

After the motor reaches about 80–90% of rated speed, the starter switches the winding connection from star to delta.
In delta connection, each winding receives full line voltage.
The motor then operates at rated torque and power.

3. Components of a Star–Delta Starter

A typical starter consists of:

Main Contactor (KM1) – connects motor to supply
Star Contactor (KM2) – forms star connection during starting
Delta Contactor (KM3) – forms delta connection during running
Timer – controls transition time from star to delta
Overload Relay – protects motor from excessive current

PVsyst is a professional software tool widely used for the design, simulation, and performance analysis of photovoltaic systems. It allows users to model grid-connected, standalone, and hybrid PV systems by incorporating detailed inputs such as solar radiation data, system configuration, shading effects, component losses, and storage behavior. PVsyst provides comprehensive outputs including energy yield, performance ratio, loss diagrams, P50–P90 probability analysis, and environmental impact assessment.

This project presents the design and performance analysis of a 1.05 MWp grid-connected solar photovoltaic (PV) system installed at Jashore University of Science and Technology, Bangladesh. The system is modeled using fixed-tilt ground-mounted PV arrays with a tilt angle of 24.5°, optimized for local climatic conditions. Meteorological data from Meteonorm (2001–2020) were used to ensure realistic energy yield estimation.

The PV plant consists of 1,750 PV modules and 800 kW AC inverter capacity, operating with a DC/AC ratio of 1.31. The annual energy production is estimated at 1344.5 MWh, with a specific yield of 1280 kWh/kWp/year and a performance ratio (PR) of 80.93%, indicating efficient system performance. The study also evaluates system losses, near-shading effects, battery self-consumption strategy, and environmental benefits, showing a significant CO₂ emission reduction of approximately 20,400 tCO₂ over the system lifetime.

Forward and reverse connection of a motor refers to the method of controlling its direction of rotation. In the case of a three-phase induction motor, the forward connection is achieved by supplying the motor with the normal phase sequence (L1-L2-L3), which makes the motor rotate in its default direction. To reverse the rotation, any two of the supply lines are interchanged, which changes the phase sequence and causes the motor to spin in the opposite direction. This process is commonly implemented using a forward and reverse starter, which employs two contactors—one for forward and one for reverse operation—along with electrical or mechanical interlocking to prevent both contactors from being energized simultaneously, thereby avoiding short circuits.

In both AC and DC motors, forward and reverse connections are essential in applications where bidirectional motion is required, such as conveyors, elevators, cranes, and machine tools. However, safety precautions must always be observed, including the use of overload protection and proper interlocking systems, to prevent damage to the motor or electrical hazards during operation.