e-Newsletter - May 2023

Department Events

One-day Workshop on Presentation Skills “PESHकश”

The Electrical Department has organized a One Day workshop on Presentation Skills “PESHकश” for SE, TE, and BE students on 3^rd May 2023. The sessions were delivered by Ms. Neha Shah, Psychologist, Human Resources, and Mr. Adarsh Srivastava, Alumnus and IET Present Around the World (PATW) Finalist. A total of 29 students from all disciplines have attended this workshop. Through this workshop, students have understood the ways of making effective presentations and delivering them with confidence.

 

Expert lecture on “High Voltage Hybrid Switchgear” by Ms. Samiksha Yawalkar

The Electrical Department in Association with the EFFECT Student Body has organized an Expert Lecture on “High Voltage Hybrid Switchgear" for BE Electrical Division: A and B students and staff of the department on 04/05/2023. The Resource Person was Ms. Samiksha Yawalkar, Quality Engineer, at Hitachi Energy, limited. A total of 54 students attended this lecture. Students learned about the GIS and AIS substation, the importance of switch gear, and applications of AIS and GIS.

IET India Scholarship Award Awareness Program 

The Electrical Department in Association with the IET Nashik Local Network has organized the IET India Scholarship Award Awareness Program for all the students of the institute. Dr. R. K. Munje provided brief information about the IET India Scholarship Award to the students and the IET student volunteers provided information on the application process and further preparation. Student volunteers are Tejas Rayate, Pranjal Jain, and Prasad Rathod. 

Student Corner

Student Placement

The following students are placed in various multinational companies in May 2023 Congratulations to all the students!

 

Sr. No.	Name of the Student	Placement Date	Batch
1.	Deore Yash Shashikant	19/05/2023	2022-23
2.	Rahade Sanket Santosh	19/05/2023	2022-23
3.	Rayate Tejas Sudhakar	18/05/2023	2022-23

 

Students Felicitation

Felicitation Ms. Radha Gawali with her parents for getting placed in a multinational company through campus placement with the hands of Prof. Rupali Ahire and Prof. Prajakta Dhole at her residence. Congratulations to Radha and her parents. 

Industrial Visit to HVDC Terminal Station, MSETCL, Padghe

Industrial Visit of TE (Electrical) Divison B Students to HVDC Terminal Station, MSETCL, Padghe on 13th May 2023 with Prof. Ganesh Jadhav and Prof. Saravanan. 

Industrial Visit to Sahyadri Farms on 11th May 2023

Industrial Visit of TE (Electrical) Students to Sahyadri Farms on 11th May 2023 with Prof. Rupali Ahire, Prof. Priya Vyavahare, and Ms. Subhada Borade on National Technology Day. 

BE Division A (2022-23) Group Photo

Annual Group photo of the students for the academic year 2022-23 for BE Division A with the Class Coordinator, Head of the Department, and Principal. 

BE Division B (2022-23) Group Photo

Annual Group photo of the students for the academic year 2022-23 for BE Division B with the Class Coordinator, Head of the Department, and Principal.

Faculty Corner

Industrial Training/Courses done by staff during May 2023

Name of Faculty	Title of Event/Workshop/ Course/FDP/STTP	Duration	Type of Event	Organized by
Prof. Sudhir K. Shinde	Invitation for Judging the “Project Competition” under the annual event TECHNOFEST 2023	One day	Competition	Late G.N.Sapkal College of Engineering
Prof. Nayana Nitin Jangle	NBA Accreditation and Teaching and Learning In Engineering (NATE)	12 weeks	Course	NPTEL – AICTE IIT Madras
Prof. Ganesh Jadhav	NBA Accreditation and Teaching and Learning in Engineering (NATE)	12 Weeks	Course	NPTEL – AICTE IIT Madras
Mrs. Shubhada Borade	Outcome-Based Pedagogic Principles for Effective Teaching	4 week	Course	NPTEL, Indian Institute of Technology Kharagpur

Faculty Participation 

Ravindra K Munje, Minal Rade  ^“The Exciting World of Electric Vehicles”   Electrical India Magzine, May 2023

Dr. R. K. Munje delivered a session for the faculty members on research and innovation in the Faculty Development (FDP) ‘Innovation, IPR, and Technical Writing’ at KVN Naik SPS Loknete Gopinathji Munde Institute of Engineering Education and Research, Nashik on 17^th May 2023.

Dr. R. K. Munje delivered a session for the students on MATLAB Programming at Sapkal College of Engineering, Nashik on 19^th May 2023.

Alumni Felicitation

Felicitation of Shri. Sharad Jha (2002 batch), Ms. Megha Nasikkar (2005 batch), and Ms. Punam Ahire (2017 batch) as distinguished alumni of the Department with the hands of Shri. Hiraman Aher, former Vice President at Mahindra & Mahindra, and Dr. R. S. Mali, former VC, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon in the presence of Hon. Chairman Sameer Wagh, K. K. Wagh Education Society, Hon. Prof. K. S. Bandi, Secretary, Hon. Shri. Ajinkya Wagh, Trustee Members and Director Dr. K. N. Nandurkar on 13th May 2023 at Kalidas Kala Mandir, Nashik. 

Congratulations on Ph.D. Completions

Congratulations to Ms. Shrunkhala Halve (2004 batch pass out) for completing Ph.D. in 'Distributed generation capacity planning and optimization in the radial distribution system' from Medi- Caps University, Indore.

Congratulations for Ph.D. Completions

Congratulations to Ms. Utkarsha Mohite (2014 batch pass out) for completing Ph.D. in 'Cancer Chemotherapy Dosage Estimation with Error Function Based Extended Kalman Filter' from SVNIT Surat. 

News Papers

Student Articles

Motor Starter Control Panels

Suryavanshi Siddhesh Dilip

TE-B, electrical engineering

03siddhesh@gmail.com

In this, we will explore the world of motor starter control panels, focusing on the Star-Delta and DOL (Direct-On-Line) starter configurations. These control panels play a crucial role in the operation and protection of electric motors, ensuring efficient and safe functioning. Let's dive in and explore the features and benefits of these motor starter control panels.

1. Star-Delta Motor Starter Control Panels

Star-Delta starters are widely used in industries where motors require reduced voltage during startup to minimize inrush current and mechanical stress. The control panel consists of two sets of contactors: the star contactor and the delta contactor. The motor is initially connected in a star configuration, which reduces the applied voltage to one-third of the line voltage. Once the motor reaches a specific speed or time delay, it switches to the delta configuration, connecting the motor to the full line voltage. This transition is achieved through a time-delay relay, providing a smooth and controlled startup.

Key benefits of Star-Delta motor starter control panels include:

- Reduced inrush current: By initially starting the motor at a reduced voltage, the inrush current is significantly reduced, minimizing stress on the motor windings and connected power system components.

- Energy-efficient operation: The reduced voltage startup helps optimize energy consumption during motor start, especially for high-power motors, resulting in cost savings over the long run.

- Improved motor protection: The time delay during the transition from star to delta configuration ensures that the motor has achieved sufficient speed and is ready for full voltage operation. This protects the motor from premature overload and damage.

- Extended motor lifespan: The controlled startup and reduced stress on the motor windings contribute to a longer lifespan, minimizing maintenance and replacement costs.

The mathematical model for a Star-Delta motor starter.

let's consider a three-phase induction motor connected to a Star-Delta motor starter. We will use the following symbols and variables:

V: Line Voltage

I: Line current

R: Motor winding resistance

L: Motor winding inductance

E: Back-emf produced by the motor

θ: Motor winding phase angle

ω: Angular velocity of the motor

T: Torque produced by the motor

f: Motor supply frequency

S: Slip of the motor

1. Star Connection:

During the Star connection, the motor windings are connected in a star configuration, and the line voltage applied to the motor is reduced by a factor of 1/√3. The mathematical model for the motor in the Star connection can be represented as:

V = √3 * E * cos(θ) (1)

I = (V - E * cos(θ)) / (R + jωL) (2)

T = k * S * |I|^2 (3)

Equation (1) relates the line voltage (V) to the back-emf (E) and the phase angle (θ). Equation (2) calculates the line current (I) using Ohm's law and taking into account the resistance (R) and inductance (L) of the motor windings. Equation (3) represents the torque produced by the motor, which depends on the slip (S) and the magnitude of the current (|I|). The constant k represents the motor constant.

2. Delta Connection:

After a certain time, the motor starter switches from the Star connection to the Delta connection. In the Delta connection, the motor windings are reconfigured in a delta configuration, and the motor operates at full voltage. The mathematical model for the motor in the Delta connection can be represented as: 

V = E * cos(θ) (4)

I = (V - E * cos(θ)) / (R + jωL) (5)

T = k * S * |I|^2 (6)

Equations (4), (5), and (6) are similar to equations (1), (2), and (3), respectively, but without the √3 factors in equation (4) since the line voltage is now the same as the back-emf.

Star delta configuration

                                  Figure 1: Star delta configuration

2. Direct-On-Line (DOL) Motor Starter Control Panels

The DOL motor starter control panel, as the name suggests, provides direct-on-line starting for motors. It is typically used for smaller motors with power ratings below 5HP. Unlike the Star-Delta control panel, the DOL panel directly applies full voltage to the motor during starting, resulting in a higher starting current and torque.

Figure 2: Direct-On-Line (DOL) Motor Starter

The DOL motor starter control panel consists of a contactor, overload relay, and various protective devices such as fuses and circuit breakers. When the control circuit is energized, the contactor closes, allowing the full supply voltage to reach the motor, initiating its rotation.

While the DOL motor starter control panel is simple in design and operation, it does not offer any inherent reduction in starting current. However, it is well-suited for applications where high starting torque is not critical, such as fans, blowers, and small machines.

Benefits of DOL motor starter control panels include:

1.  Simplicity and cost-effectiveness: DOL starters are relatively straightforward, requiring minimal additional components, making them cost-effective for smaller motors and applications.

2. Quick and immediate motor response: With no voltage reduction or transition delay, DOL starters provide immediate power to the motor, ensuring rapid startup and response.

3.  Easy maintenance and troubleshooting: The simplicity of the DOL starter makes it easier to maintain and troubleshoot any issues that may arise.

Conclusion

Motor starter control panels are essential for the efficient and safe operation of electric motors. The Star-Delta configuration offers reduced voltage startup, minimizing inrush current and mechanical stress. On the other hand, the DOL configuration provides a simple and cost-effective solution for smaller motors. The choice between the two depends on factors such as motor size, application requirements, and the need to minimize inrush current.