DC MACHINE WITH LOADING ARRANGEMENT
This is a DC motor with the above specifications. The shaft of this motor is coupled mechanically to a break drum. A belt moving over this break drum provides necessary torque to the shaft of the motor, and in turn loads the shaft with a finite torque. Two calibrated spring balances are connected to either side of the belt, which is moving over the break drum. This is a method to load the shaft of the motor with a loading arrangement. By taking reading on these spring balance readings, the loading value may be calculated.
LOAD TEST ON A DC SHUNT GENERATOR
Objective: To obtain external characteristics of a dc shunt generator
Preview:
The self excited DC shunt Generator is coupled to a DC motor, which acts as prime mover. Two characteristics are more important. The internal or total characteristic that gives the relation between the emf actually induced in the armature and the armature current. This is of interest mainly to the designer. The external characteristics called performance characteristics (also voltage regulating curve) which give the relation between the terminal voltage and load current. This curve lies below the internal characteristics due to armature drop. This is important in judging the suitability of a generator for a particular purpose. These characteristics can be obtained by a load test with total field resistance remaining fixed as the speed is to be kept constant.
Equipment Required: All the measuring instruments associated with each experiment are industrial grade. These instruments are housed in an elegant cabinet as a package. Range of instruments and accessories (standard format)
1. 2HP Shunt machines mechanically coupled both are identical 220V 2HP 1500rpm.
2. 3-4 point DC Starter for the above
3. Suitable Loading rheostats
4. Digital tachometer
5. Suitable double tube rheostat
6. Suitable single tube rheostat
7. Suitable digital Voltmeters DC
8. Suitable digital ammeters DC.
9. Suitable DC source –Rectifier unit
3 Phase AC Machine With Loading Arrangement
This is a 3-phase AC machine. This is mechanically coupled to a breakdrum to provide loading. The shaft of the machine is coupled a drum. In turn the drum is connected to mechanical weighing pan by means of a belt. Rotating the screws provided on either sides of the belt can adjust the belt tension. There by it is possible to load the shaft of the 3-phase motor with a defined tension. The difference in the scale reading, provides the tension, the shaft is subjected to. As a result of this the current in the windings are varied. By noting the readings of the associated meters and the difference in the weighing pan readings, the load characters of the motor can be evaluated.
3 PHASE INDUCTION MOTOR
This is an AC 3 ? induction motor. This operates on 415V AC. This squirrel cage induction motor coupled to a 2KW shunt generator.
Specifications:
Volts: 415V - 3¢
Power: 2.2KW
Current : 4.8A
RPM: 1440
Frame: PM100
Single Phase Transformer
Single phase double wound copper transformer having primary 230VAC and secondary 115V AC with a rated capacity of 1KVA. The primary and secondary terminals are brought out for conducting laboratory experiment with legend printed for convenience. This is assembled in a powder coated MS metal box.
Specifications:
Primary : 230 V AC
Secondary with tappings at 86.6% and at 50% of primary voltage.
Rated capacity: 1KVA
Terminations: Separate 4mm Banana terminals at input and outputs
Enclosure: Powder coated MS metal cabinet, with separate screw terminal for earth connection.
Alternator
This is an AC 3 ? synchronous alternator with, square path, 4 poles, and rotor wound stator excited type. This is screen protected IP22, with drip proof enclosure.
Specifications:
Voltage: 415V
Amps: 4.2A
RPM: 1500
KVA-3
Rating-CMR
Phases-3,Hz-50
ENCL-S.P,PF-0.8
Extn VOLTS-220
Winding-Y
Amps-1.4A
Repulsion Motors
make Repulsion motor is a single phase motor which has stator winding arranged for connection to source of power and Armature winding connected to commutator and brushes on commutator are short circuited. Brushes are so placed that the magnetic axis of Rotor winding is inclined to magnetic characteristic to change the Direction. Repulsion motor is continuously rated, screen protected, self ventilated machine in E/B class Insulation and confirms
Capacity : 0.37 / 0.75kw
Rpm : 2880
Voltage : 230V Single phase AC 50Hz.
SLIP RING INDUCTION MOTOR
Slip Ring Induction Mrtor
1. Outer yoke made up of High grade cast iron MS Frame
2. High grade silicon stamping Stator with hydraulically pressed
3. Suitable copper conductor of best quality used for winding for both Stator and Rotor4. Skewed Rotor construction with dynamically balance ensuring low noise
5. Larger size of bearings for longer life and trouble free operations
6. Vacuum pressure impregnation for stator & rotor ensuring high insulation strength
7. Rotor and brake drum Pulley are Dynamically Balanced8. Gun Metal Slip rings with good quality carbon brushes are used
9. All the terminals on terminals Box are properly engraved
10. Sturdy base frame with heavy duty bolt and also highly accurate dial type spring balance to give proper readings of the machines. All Slip Ring Induction Motors Confirming to ISS
11. Ratings: For 3ph, 415Volts, 50Hz. 2H.P to 7.5HP
12. Starting Methods: Rotor Resistance Starter with no volt and over load protection.
Kilo Watt Meter
We are engaged in manufacturing and supplying a wide range of Kilo Watt Meters. These Kilo Watt Meters are manufactured following international industry standards, and assures superb performance. Kilo Watt Meters offered by us are widely used in various heavy industries. These products are widely recommended for their unmatched quality and flawless performance. With the availability in various technical specifications, these Kilo Watt Meters are easily available.
Features:
Flawless range
Superb quality
Durability
Frequency Meter
We are engaged in manufacturing and supplying a designer range of Frequency Meters, which are precisely engineered by our expert engineers. We develop these Frequency Meters from high grade raw materials sourced from our certified vendors. With the availability in various technical specifications these Frequency Meters are available in various measurements. Our products are widely used in various industrial and electrical purposes.
Features:
· Flawless range
· Superb quality
· Optimum performance
Squirrel Cage Induction Motor
Squirrel Cage Induction Motor
1. Outer yoke made up of High grade cast iron frame.
2. High grade silicon stamping Stator with hydraulically pressed.
3. Dynamically balance dies casted Rotor of High grade Aluminum used.
4. Larger size of bearings for longer life and trouble free operations.
5. Vacuum pressure impregnation for stator - ensuring high insulation strength.
6. All the terminals on terminals Box are properly engraved.
7. Brake drum pulley are Dynamically Balanced.
8. Sturdy base frame with heavy duty bolt with C.P. handle and also highly accurate dial type spring balance to give proper readings of the machines.
9. Ratings: For 3ph, 415Volts, 50Hz.
0.5H.P to 15HP.10. Ratings: for 1ph 220V, 50Hz.
capacitor Start/ Run Motor 0.5H.P to 2 H.P.
DC Shunt Generator No Load Tests On DC Shunt Generator
Open Circuit Test
Objective: To obtain the magnetization characteristic and therefore determine the critical field resistance and critical speed of the given dc shunt generator.
Preview:
The EMF induced in a DC machine is proportional to the flux per pole, the number of conductors and speed. This EMF depends on speed and flux. As the flux increases the EMF increases beyond a point the flux gets saturated. The BH curve of the core depicts the magnetization curve of the machine.
(A) Critical Speed of a DC Shunt Generator
Objective: To determine the critical speed of a dc shunt generator. With the fixed excitation and variable speed, as the speed reduces the OCC proportionally slides down so that the no load voltage reduces. At a particular speed, called the critical speed, the OCC is tangential to the Rf line and as a result the generator fails to excite.
Preview:
With the fixed excitation and variable speed, as the speed reduces the OCC proportionally slides down so that the no load voltage reduces. At a particular speed, called the critical speed, the OCC is tangential to the Rf line and as a result the generator fails to excite.
Equipment Required: All the measuring instruments associated with each experiment are industrial grade. These instruments are housed in an elegant cabinet as a package. Range of instruments and accessories (standard format)
1. 2HP Shunt machines mechanically coupled both are identical 220V 2HP 1500rpm.
2. 3-4 point DC Starter for the above
3. Suitable Loading rheostat
4. Digital tachometer
5. Suitable Double tube rheostat
6. Suitable Single tube rheostat
7. Suitable Digital Voltmeter DC
8. Suitable Digital Voltmeter DC
9. Suitable Digital Ammeter DC
10. Rectifier Unit 0-240V DC @ 1.5KVA with power failure protection.
Inductive Load
Voltage utilized in industry are of either Resisitive, Inductive or Capacitive types these provide various types of power factor and the power system behaves accordingly. Resistive load banks are used to provide braking effect or for Heat dissipation.
These have canthel wires wounded on porcelain tubes through which electricity is passed & current flows, normally for Resistive loads the Power factor is unity. This Model is the Industrial/Educational model suitable for demonstrating to students the complete know of the Basics, Loading provided in steps, Study of Efficiency & Maintenance of these Loads packaged in small rating. Students can make connections of their own with the help of the terminations provided.
Technical Specs :
- Power ratings available : 1KW / 2KW / 5 KW / 10KW
- Voltage Primary : 440V AC 3Phase/ 220V AC Single phase /220V DC
- Enclosed in cabinet with Steps provided for loading, meters provided for each phase & terminations brought out on Banana terminals
Knife Switch
Low voltage, single pole double throw, moulded base with plated metal contacts and screw connectors.
Autotransformer
We are manufacturer of complete range of autotransformers.We are regularly supplying our autotransformers to most parts of the world.
Electrical Lab Engineering Equipments
