Teaching Laboratories

The lab is used for course no EE380A & EE381A (Electrical Engineering Laboratory) and is located in WL112
Contact No: 7849

Overview

Electromechanical Energy Conversion (EMEC) Laboratory is the one the oldest and important laboratory of Electrical Engineering Department. The lab is equipped with conventional and modern electrical& electronic measuring equipments and ac & dc electrical machines. It is used for UG lab courses EE -380A & EE 381A. In the lab students study, learn & perform the experiments on different types of electrical machines such as - transformers, Synchronous motors, alternators, dc motors & generators, three phase and single phase induction motors, relays and controlled rectifiers to verify the different characteristics of the electrical machines.

Faculty

Dr. A Joshi
Dr. S C Srivastava
Dr. S P Das
Dr. P. Sensarma
Dr. S N Singh

Equipment

DC Rectifier Sets, 0-270 V, 100 Amps and 50 Amps.
Step Down Transformer, 25 kVA, 415/230V, 3-phase, 50Hz,
Three Phase Alternators coupled with DC Motors.
Open type dc & ac machines.
Synchronous Motor coupled with DC Generators.
Three Phase Squirrel cage Induction Motors
Three Phase Squirrel cage Induction Motors Coupled with DC shunt Generators.
Single phase Squirrel cage capacitor start capacitor run induction motors.
Single phase Squirrel cage capacitor start capacitor run induction motors coupled with DC shunt Generators.
Experimental tables with panel boards.
Single phase full and half controlled rectifier’s kits.
Step down transformers of various ratings.
Three and Single Phase Auto Transformers of various ratings.
Test setups of directional over current relay
Test setups of determination of phase sequence of three phase system.
Digital Storage Oscilloscopes.
Various ratings and various types of portable measuring equipments such as Watt meters, Voltmeters, Ammeters, Phase sequence indicator, Digital True RMS Multimeter, Electronic and rotary type Synchronoscopes.
Insulation Tester (test voltage up to 5 kV)
Clamp Meters,
Infrared Thermometer.
Current Probes.
Voltage Differential Probes.
Clamp on Earth Tester.
Digital Contact and Non-contact type Tachometers
Stroboscopes.
Programmable LCR Bridge.
Current Transformers.
Rheostats of various ratings.
Three Phase and Single phase resistive loads.
Three and single phase Capacitive Loads.
Three Phase and Single phase fixed & variable Inductors.

List of Experiments for EE380A

Experiment No 1
- To perform Sumpner's test on two identical transformers and calculate their efficiency at 110%, 100%, 75% and 25% of full load at unity and 0.8 p.f. lagging
- To separate the hysteresis and eddy current losses combined in the core of a 1-phase transformer under the rated conditions
Experiment No. 2
- To conduct load flow studies on a power system using Power System software and study the effect of the following:
  (a) Generation rescheduling
  (b) Increasing transmission line length
  (c) Increasing system load
  (d) Shunt compensation (e) Series compensation
Experiment No. 3
- To connect three single phase transformers into three-phase transformer bank and study the waveforms for various configurations.
Experiment No. 4
- To perform no-load, blocked rotor and load tests on l-phase capacitor start-capacitor run induction motor and determine:
  (a) The parameters for the equivalent circuit.
  (b) Compute the performance of motor from the parameters and compare with experimental results.
Experiment No. 5
- To perform no load, blocked rotor and load tests on a 3-phase squirrel cage induction motor and draw its equivalent circuit referred to the stator and calculate the efficiency of the motor.
- Also obtain the performance characteristics of the motor theoretically from the equivalent circuit parameters and compare it with the experimentally obtained results.
Experiment No. 6
- To perform open and short circuit tests on a synchronous generator and determine its synchronous impedance (i) neglecting saturation and
  (ii) considering saturation.
- To determine an equivalent circuit of the generator using the synchronous impedance values determined in above (i) and (ii).
- To determine and draw the terminal voltage versus load current characteristics of the generator for unity power factor load using the equivalent circuit determined in part 2 above.
- Also to determine voltage regulation of the generator for unity power factor load.

List of Experiments for EE381A

To study single phase AC regulator and its operation with R-load, and RL-load.
To study single phase half controlled rectifier and its operation with R-load and RL–load.
To obtain ‘V’ curves of a Synchronous Motor.
(a) To Synchronize a Synchronous Generator with infinite bus Bar by Synchroscope and lamps methods.(b) To determine the maximum power transfer capacity across a transmission line in a single machine infinite bus system.
(a) To study the directional inverse time over-current relay type CDD-21.(b) To determine the phase sequence or direction of phase rotation in a 3-phase system and compare it with the sequence determined by a phase sequence meter.
To conduct experiment in the High Voltage lab to observe the followings. (a) Distinction between the types of electrostatic fields.(b) Different stages in gas breakdown.

Testing Facilities

High Current Transformer and test setups for temperature rise test
RCCB Test Setups.
MCCB Test setups.
Main Switches and Starters Test Setups except short circuit test.
Electrical Endurance and over load test Setup up to 800 amps for three phase and single phase RCCBs, MCCBs, Starters and Main switches.
Humidity Chamber.
AC High Voltage Break Down Tester.
Oven.
Sound Proof Box.
Leakage Current Clamp Meter.

Contact Person

Mr. Lekhraj Singh
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Location: WL112
Contact No: 7849

Lab-in-charge:
Mr. Lekhraj Singh
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Support staff: Mr. S.P. Sahu

The lab is used for course no EE647 (Microwave Measurements and design) and following research areas. It is located in ACES225

Microwave Measurement and Design
Characterization of Microwave devices and circuits

Contact No: 7105

Faculty

Facilities

Equipment:
- Agilent PNA-L Network Analyzer N5230A (10 MHz to 50 GHz)
- Agilent ENA Series Network Analyzer E5062A (300 KHz to 3 GHz)
- Agilent Network Analyzer 8714ET (300 KHz to 3000 MHz)
- Agilent Spectrum Analyzer N9320B (9 KHz to 3GHz)
- Rohde and Schwarz Spectrum Analyzer FS300 (9 KHz to 3GHz)
- Agilent PSG analog signal generator E8257D 250 KHz to 20 GHz
- Agilent RF Signal Generator N9310A (9 KHz to 3GHz)
- WaveTek Microwave Source Model-952 (1 GHz to 4 GHz)
- WaveTek Microwave Source Model-954 (3.7 GHz to 7.6 GHz)
- WaveTek Microwave Source Model-955 (7.5 GHz to 12.4 GHz)
- HP Signal Generator 8656B (0.1 MHz to 990 MHz)
- Agilent Function/Arbitrary Waveform Generator 33250A 80 MHz
- HP Power Meter 437B
- HP Power Sensor 8481A
- HP Noise Figure Meter 8970B
- Agilent RF Amplifier 83006A, 0.01-26.5 GHz, 20 dB gain
- Agilent Calibration kit 85056D 2.4 mm
- Agilent Calibration kit 85032F Type-N
- Agilent Calibration kit 85033D 3.5 mm
Shielded Anechoic Chamber:
- A Radio frequency (RF) anechoic chamber is a closed RF echo free space that simulates infinite free space condition inside a room. It is constructed by covering the inner walls of the room by RF absorbers made of carbon impregnated foam shaped in the form of pyramids (Fig. 1). The size of the pyramids and the carbon composition determines the lowest frequency that can be effectively absorbed. Larger sized cones are capable of absorbing lower frequency waves.
- Anechoic chamber are used for measurement of antenna radiation pattern, electromagnetic compatibility, radar cross section, etc. Apart from creating a reflection free environment, an anechoic chamber should also suppress the unwanted signals penetrating into the chamber and interfering with the measurements. This is achieved by first lining the walls of the chamber by high permeability metal sheets and then with the RF absorber material. The metal cage is grounded using a specially prepared low conductivity earth pit connection to provide a zero potential cage. The metal cage shields the measurement space from external interferences.
- The chamber dimension are 7 m x 6 m x 3.3 m (LxWxH). It can be used for conducting measurements at frequencies from 1 GHz to 26 GHz. The quiet zone is 2m x 0.8 m x 0.8 m (WxHxL) at 1 GHz, and 2m x 0.3 m x 0.3 m (WxHxL) between 10 GHz and 26 GHz centered at a distance of about 4 m from the transmitting antenna. The shielded effectiveness is -50 dB at 1 GHz and – 40 dB from 2 to 18 GHz.

List of Experiments

VSWR Measurement and Impedance Calculation. Measure the VSWR using normal method and double minima method. Measure the frequency using the frequency meter and compare with calculated guided wavelength. Calculate the input impedance of a given load from the VSWR measurements and shift in the minima
Study of Tuners and Impedance Matching using single, double and E-H tuners Measure the post reactance as a function of the depth of the post Impedance matching of a given load using slide screw tuner, E-H Tuner, Double stub tuner.
To study the behavior of terminated coaxial transmission line in both frequency and time domains.
Familiarization with basic operation of Vector Network Analyzer (VNA)Study the operation of VNA and understand the use of menus/soft keys Study the method of setting reference and introducing offset to obtain accurate readings. Use the VNA to measure the complete S parameters of the component under test.
Calibration and measurement with Vector Network Analyzer. Performing the 2-port calibration on the coaxial media. Characterization of the directional coupler, filter, attenuator etc.
Understanding of Power Meter and calibration of variable attenuator. Understand the use of power meter. Calibration of variable attenuator. Determination of detector characteristics.
Directional Coupler Characteristics and application to Scalar Network Analyzer. Measure the characteristics of a directional coupler like coupling, isolation and directivity. Use the directional coupler to set up a scalar network analyzer and measure the scattering matrix of a two-port device.
Familiarization with the Noise Figure Meter and Measurement of Noise Figure of different devices. Familiarization with the Noise Figure Meter. Measurement of Noise Figure of different devices.
Study of Spectrum Analyzer Measurement. Familiarization with the Spectrum Analyzer. Study of the spectra of modulated waveforms. Measure the 1 dB compression point of the amplifier and the harmonics produced. Gain flatness. Use the tracking generator as a scalar analyzer.
Measure the radiation pattern and gain of the antenna. Measure the radiation pattern of the antenna under test. Measure the gain of the antenna using absolute gain measurement and gain comparison method.

Staff

Ms. Anchal Agrawal

Photos

Contact Person

Dr. Kumar Vaibhav Srivastava
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: 91-512-259-7105
Location: ACES-225