46968 Electrical Workstation offers an excellent approach to the teaching of Electrical M a chine s pr inc ipl e s by introducing a unique modular designed control unit. It provides flexibility for the s t u d e n t s t o c a r r y o u t experiments over AC and DC Machines using a large selection of Industry standard inbuilt components.

Electrical Machines is one of the most important area of study as it helps users to understand the operational characteristics and working of AC and DC Machines. 46968 enables user to put their t h e o r y k n o w l e d g e i n t o practice with ease. There is an additional facility to make wireless connection on workstation with computer and to monitor real time electrical parameters using computer interfacing software. Users can also observe a real time graph between any of the AC and DC electrical parameters on computer.

Workstation comprises of separate AC and DC measuring sections equipped with all the necessary instruments such as digital meters, facility to connect AC and DC Supplies along with protection devices such as Fuses, MCB’s, Supply Indicators, etc. There are multiple buses provided on the Workstation to make external connections while performing AC and DC Machines Experiments.

The design of the control unit ensures to get the highest quality practical experience to user. All the necessary protective measures are taken to avoid fault or danger.

Note: All AC & DC Machines along with supporting accessories are available optionally

Features

1. Compatible for Machines upto 2HP
2. Equipped with Measurement Facilities for Experimentation on AC Machines, DC Machines and Transformers
3. Separate AC and DC Measuring Sections
4. Diagrammatic representation of AC and DC Machines for better understanding
5. Rust Free Powder Coating Paint
6. Standard BS-10 terminals, patch cords for safety purpose
7. Terminals provided to obtain Three Phase Fixed as well as Variable AC and DC Supplies with suitable protection
8. High Quality Digital Tachometer for RPM Measurement
9. Motors provided with standard Mechanical Loading Arrangement Facility
10. Motors with “aluminum” casted Brake-Drum/Pulley with heat suppression facility
11. Machines with Class “B” Insulation
12. Flexible shaft coupling arrangement (Lovejoy) for Motor Generator (MG) Sets
13. Machines provided with Heavy Duty Base/Channel with suitable interconnection
14. Machines provided with suitable protections such as MCB's, Fuses, Motor Generator (MG) Sets provided with coupling protective cover
15. Generator with Electrical Loading Arrangement Facility
16. Durable good quality spring balance
17. Designed by considering all the safety measures

Technical Specifications

Electrical Measuring Instruments

AC Ammeter (4 Nos.)

• Type : Digita
• Range : 10A

AC Voltmeter (4 Nos.)

• Type : Digital
• Range : 450Vrms

DC Ammeter (4 Nos.)

• Type : Digital
• Range : 20A

DC Voltmeter (4 Nos.)

• Type : Digital
• Range : 300V

Single Phase Wattmeter (2 Nos.)

• Type : Digital
• Range : 4kW

DC Supply (for excitation purpose only)

• Voltage : 300V ± 10%
• Current : 2Amp

DC Power Supply

• DC Output Voltage (Fixed) : 220V ± 10%, 2A
• DC Output Voltage (Variable) : 220V ± 10%, 15A

Protective Devices

• Three Phase MCB (TPN) : 2 Nos.
• Interconnections : 4mm BS-10 Safety Terminals

Object

DC Machines (optional)

DC Shunt Wound Motor

1. Study of Operational Working and Principle of DC Shunt Motor
2. Study of running and reversing phenomenon of DC Shunt Motor
3. Study of No Load Characteristic of DC Shunt Motor
4. Study of Load Characteristic of DC Shunt Motor
5. Study of speed control of DC Shunt Motor using armature voltage control and flux field control method
6. Study and Determine the losses of DC Machine and correspondingly calculate the efficiency of DC Machine by Swinburn's Test Method

DC Series Wound Motor

1. Study of Operational Working and Principle of DC Series Motor
2. Study of running and reversing phenomenon of DC Series Motor
3. Study of Load Characteristic of DC Series Motor
4. Study of speed control of DC Series Motor using armature voltage control and flux field control methods

DC Compound Wound Motor

1. Study of Operational Working and Principle of DC Compound Motor
2. Study of running and reversing phenomenon of DC Compound Motor
3. Study of Load Characteristic of DC Cumulative-Compound Wound Motor
4. Study of Load Characteristic of DC Differential-Compound Wound Motor

DC Shunt Wound Generator

1. Study of Operational Working and Principle of DC Shunt Generator
2. Study and measurement of Open Circuit Characteristic of DC Shunt Generator
3. Study and measurement of External Characteristic of DC Shunt Generator
4. Study and measurement of Internal Characteristic of DC Shunt Generator

DC Series Wound Generator

1. Study of Operational Working and Principle of DC Series Wound Generator
2. Study and measurement of Open Circuit Characteristic of DC Series Generator
3. Study and measurement of Load Characteristic of DC Series Generator
4. Study and verify the Field Test of DC Series Machine and correspondingly determine the efficiency of DC Series Motor and Generator at any desire load

DC Compound Wound Generator

1. Study of Operational Working and Principle of DC Compound Wound Generator
2. Study and verify the Load Characteristics of Long Shunt Cumulatively Compound Generator
3. Study and verify the Load Characteristics of Short Shunt Cumulatively Compound Generator
4. Study and verify the Load Characteristics of Long Shunt Differentially Compound Generator
5. Study and verify the Load Characteristics of Short Shunt Differentially Compound Generator

AC Machines (optional)

Single Phase Capacitor Start Induction Motor

1. Study of Operational Working and Principle of Single Phase Induction Motor
2. Study of Running and Reversing of Single Phase Induction Motor
3. Study of the No-Load Test in a Single Phase Induction Motor
4. Study of the Blocked Rotor Test in a Single Phase Induction Motor
5. Study of Load Test in a Single Phase Induction Motor

Three-phase Squirrel Cage Induction Motor

1. Study of Operational Working and Principle of Three Phase Squirrel Cage Induction Motor
2. Study of Running and Reversing of Three Phase Induction Motor
3. Study of No Load Test performed in a Three Phase Induction Motor
4. Study of Block Rotor Test performed in a Three Phase Induction Motor
5. Measurement of Slip in a Three Phase Induction Motor
6. Study of Speed-Torque characteristics in a Three Phase Induction Motor

Three Phase Salient Pole Synchronous Motor

Study of Operational Working and Principle of Three Phase Synchronous Motor

Study of V curve of Three Phase Synchronous Motor

Study of Inverse V curve of the Three Phase Synchronous Motor

Three Phase Salient Pole Synchronous Generator

1. Study of Operational Working Principle of Three Phase Synchronous Generator
2. Study and Measurement of Positive Sequence Impedance of Three Phase Synchronous Generator
3. Study and Measurement of Negative Sequence Impedance of Three Phase Synchronous Generator
4. Study and Measurement of Zero Sequence Impedance of Three Phase Synchronous Generator
5. Study of short circuit characteristics (SCC) of three Phase Synchronous Generator
6. Study of open circuit characteristics (OCC) of three Phase Synchronous Generator
7. Study and measure of voltage regulation of Three Phase Synchronous Generator using EMF Method

Single Phase Transformer:

1. Study of Single-Phase Isolation Transformer 
2. Study of Single-Phase Step Down Transformer
3. Study of Single-Phase Step Up Transformer
4. Study of Subtractive Polarity of Single Phase Transformer
5. Study of Additive Polarity of Single-Phase Transformer
6. Study of Open Circuit test of Single-Phase Transformer
7. Study of Short Circuit Test of Single-Phase Transformer

To determine the Efficiency and Voltage Regulation of a Single-Phase Transformer by direct loading at different loading condition.

Three Phase Transformer:

1. Study of Open Circuit test of Three-Phase Transformer
2. Study of Short Circuit Test of Three-Phase Transformer
3. Study of Three Phase Configurations in Three Phase Transformer

**More than 70 Experiments can be performed in 46967

**Also suitable for performing experiments on basic Electrical Measurements

Technical Specifications of Optional Machines

DC Motors (optional)

Machine Specification Type - Shunt

• Power Rating : Available with 1/2HP, 1HP& 2HP
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Loading arrangement : Mechanical
• Spring Balance : 2Nos.(Tubular Type)
• Brake Drum/Pulley : Aluminum casted with heat suppression facility
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Machine Specification Type - Series

• Power Rating : Available with 1HP&2HP
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Loading arrangement : Mechanical
• Spring Balance : 2Nos.(Tubular Type)
• Brake Drum/Pulley : Aluminum casted with heat suppression facility
• Machine Base : “C” Channel

Machine Specification Type - Compound

• Power Rating : Available with 1HP&2HP
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Loading arrangement : Mechanical
• Spring Balance : 2Nos.(Tubular Type)
• Brake Drum/Pulley : Aluminum casted with heat suppression facility
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

AC Motors (optional)

Machine Specification - Single Phase Induction Motor

• Type : Single phase Capacitor Start Induction Motor
• Power Rating : Available with 1HP
• Voltage Rating : 230V AC ± 5%, 50Hz
• Rated Speed : 1440RPM ± 7.5%
• Insulation : Class 'B’
• Loading arrangement : Mechanical
• Spring Balance : 2Nos.(Tubular Type)
• Brake Drum/Pulley : Aluminum casted with heat suppression facility
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Machine Specification - Three Phase Squirrel Cage Induction Motor

• Type : Three Phase Squirrel Cage Induction Motor
• Power Rating : Available with 1HP & 2HP
• Voltage Rating : 415V AC ± 5%, 50Hz
• Rated Speed : 1440RPM ± 7.5%
• Insulation : Class 'B’
• Loading arrangement : Mechanical
• Spring Balance : 2Nos.(Tubular Type)
• Brake Drum/Pulley : Aluminum casted with heat suppression facility
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Single Phase Transformer (optional)

Transformer Specifications

• Mains Supply : Single Phase, 230V AC ±10%, 50Hz
• Rating : 1kVA
• Primary Voltage : 0-125V, 0-125V
• Secondary Voltage : 0-125V, 0-125V
• Rated Current : 5A

Three Phase Transformer (optional)

Transformer Specifications.

• Mains Supply : 415V ±10%, 50Hz
• Type : Three Phase
• Power Rating : 1kVA
• Primary Voltage : 415V
• Secondary Voltage : 230V
• Rated Current : 4A

DC Generators (optional)

Machine Specification

Both the Machines are flexibly coupled and Mounted on a Single 'C' Channel Base DC Machine (acts as prime mover)

Type : Shunt

Voltage Rating : 220V DC ± 5%

Rated Speed : 1500RPM ± 7.5%

Insulation : Class 'B’

DC Machine (acts as generator)

• Type : Shunt
• Power Rating : Available with 0.5HP, 1HP & 2HP
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Shaft extension : Single Sided
• Loading Arrangement : Electrical
• Type of Coupling : Flexible “Lovejoy” Coupling
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Machine Specification

Both the Machines are flexibly coupled and Mounted on a Single 'C' Channel Base DC Machine (acts as prime mover)

• Type : Shunt
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’

DC Machine (acts as generator)

• Type : Series
• Power Rating : Available with 1HP & 2HP
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Shaft extension : Single Sided
• Loading Arrangement : Electrical
• Type of Coupling : Flexible “Lovejoy” Coupling
• Machine Base : “C” Channel
• Protection : Fuses(mounted at the terminal box of the Machines)

Machine Specification

Both the Machines are flexibly coupled and Mounted on a Single 'C' Channel Base

DC Machine (acts as prime mover)

• Type : Compound
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’

DC Machine (acts as generator)

• Type : Compound
• Power Rating : Available with 1HP & 2HP
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Shaft extension : Single Sided
• Loading Arrangement : Electrical
• Type of Coupling : Flexible “Lovejoy” Coupling
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

AC Generators (optional)

Machine Specification

Both the Machines are flexibly coupled and Mounted on a Single 'C' Channel Base

Three Phase Synchronous Machine

• Type : Salient Type
• Power Rating : 3 HP
• Voltage Rating : 415V AC ± 10%, 50Hz
• Configuration : “Delta” Connected
• Rated Speed : 1500RPM ± 5%
• Insulation : Class 'B’
• Excitation Voltage : 180Vdc ± 10%

DC Machine (acts as generator)

• Type : Shunt
• Power Rating : 2HP
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Loading Arrangement : Electrical
• Type of Coupling : Flexible “Lovejoy” Coupling
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Machine Specification

Both the Machines are flexibly coupled and Mounted on a Single 'C' Channel Base

DC Machine

• Type : Shunt
• Power Rating : 2HP
• Voltage Rating : 220V DC ± 5%
• Rated Speed : 1500RPM ± 5%
• Insulation : Class 'B’

Three Phase Synchronous Machine

• Type : Salient Type
• Configuration : "Star" Connected
• Power Rating : 3HP
• Voltage Rating : 415V AC ± 5%, 50Hz
• Rated Speed : 1500RPM ± 7.5%
• Insulation : Class 'B’
• Excitation Voltage : 180Vdc ± 10%
• Loading Arrangement : Electrical
• Type of Coupling : Flexible “Lovejoy” Coupling
• Machine Base : “C” Channel
• Protection : Fuses (mounted at the terminal box of the Machines)

Other Supporting Optional Items

Single and Three Phase Resistive Load

Single Phase Operation

• Voltage : 240V AC ±10%, 50Hz
• Current : 15A
• Power : 3.5kW
• Loading steps : 15

Three Phase Star Operation

• Voltage : 415V AC ±10%, 50Hz
• Current : 5A (per Phase)
• Power : 3.5kW
• Loading steps : 5 (per Phase)

Three Phase Delta Operation

• Voltage : 415V AC ±10%, 50Hz
• Current : 15A (per Phase)
• Power : 10.5kW
• Loading steps : 5 (per Phase)
• Switching Technique : Star/Delta Switch, 415V, 25A
• Mains MCB : 16A (TPN)

Three Phase Inductive Load

• Three Phase Star Operation
• Voltage : 415V AC ±10%, 50Hz
• Current : 10A (per Phase)

Single and Three Phase Capacitive Load

Single Phase Operation

• Voltage : 230V AC ±10%, 50Hz
• Current : 14A (Approx.)
• Loading steps : 30

Three Phase Star Operation

• Voltage : 415V AC ±10%, 50Hz
• Current : 4.6A (per Phase)
• Loading steps : 10 (per Phase)

Three Phase Delta Operation

• Voltage : 415V AC ±10%, 50Hz
• Current : 13A (per Phase)
• Loading steps : 10 (per Phase)
• Switching Technique : Star/Delta Switch, 415V, 25A
• Mains MCB : 16A (TPN) 10A (One Pole) 30 Nos.

Thyristorized DC Regulated Power Supply

• Input Mains : 415VAC ± 10%, 50Hz
• Rated Output Voltage : 220VDC (Fixed) ± 5%,
• Rated Output Current : 50ADC
• Regulation : Less than 3% at full load condition.

Measuring Instruments

• AC Voltmeter : 1 No. (with voltage selector switch)
• DC Ammeter : 1 No.
• DC Voltmeter : 1 No.

Protection with its indicators

Overload Protection

Short Circuit Protection

Phase Sequence Indicator

Single Phase Variac

• Type : Close Type
• Operating Rating : 230V AC ±10%, 50Hz
• Output Voltage : 0 - 270V AC ±10%, 50Hz
• Current : 10A (Also available in different Current Ratings)

Three Phase Variac

• Type : Close Type
• Operating Rating : 415V AC ±10%, 50Hz
• Output Voltage : 0 - 470V AC ±10%, 50Hz
• Current : 10A (Also available in different Current Ratings)

Electrical Data Acquisition System is a versatile solution that allows high quality measurements for all Electrical Parameters and is suited for all types of Engineering Laboratories. Electrical Data Acquisition System provides wireless measurements of Single and Three Phase AC as well as DC Parameters measurements with high accuracy.

Electrical Data Acquisition System includes three inputs each for Voltage and Current, two inputs each for DC Voltage and DC Current to measure an entire Three Phase Parameters and DC Parameters such as AC and DC Voltage, AC and DC Current, Active Power, Reactive Power, Apparent Power, Power Factor, Frequency, etc. along with Over Load Protection Indicators and buzzer at the same time. All these parameters will be displayed on the PC Software screen provided with the product.

Electrical Data Acquisition System is compatible for three phase/three wire and three phase/four wire configurations. User can also plot a real time graph between any of these parameters on computer through the facility of wireless connectivity.

Technical Specifications

• Communication Frequency : 2.4GHz
• RF Power : 1mWatt
• Range : 10Mtr.

Measurement Ranges

• AC Voltage Range : 25-450Vrms, accuracy ±1%
• AC Current Range : 0.20-10Amp, accuracy ±1%
• DC Voltage Range : 25-300Vrms, accuracy ±1%
• DC Current Range : 0.20-15Amp, accuracy ±1%
• Frequency : 45-55Hz, accuracy ±0.5Hz
• Active Power : 50-3000Watts, accuracy ±2%
• Reactive Power : 50-3000Watts, accuracy ±2%
• Apparent Power : 50-3000Watts, accuracy ±2%
• Power Factor : 0.30 to 0.99 both Lead and Lag, accuracy ±3º Electrical
• Speed : Up to 2500 RPM
• Torque : 0 - 25 N-m
• Auxiliary Supply : 230V AC± 10%, 50Hz