H. L. Scientific Industries
Bank Road, Ambala, Haryana
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Electrical Engineering Equipments

Single Phase Transformer,3 Phase Ac Machine With Loading Arrangement,3 PHASE INDUCTION MOTOR,Alternator,DC MACHINE WITH LOADING ARRANGEMENT,LOAD TEST ON A DC SHUNT GENERATOR,Repulsion Motors,SLIP RING INDUCTION MOTOR,Kilo Watt Meter,Frequency Meter,Squirrel Cage Induction Motor,Dc Shunt Generator No Load Tests On Dc Shunt Generator,Inductive Load,Knife Switch

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'PHYSILAB'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.



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  • Item Code: HL-52312
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Low voltage, single pole double throw, moulded base with plated metal contacts and screw connectors.



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  • Item Code: HL-52315
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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




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  • Item Code: HL-52314
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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.

 

 



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  • Item Code: HL-52313
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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 

 



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  • Item Code: HL-52311
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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

 

 

 

 

 



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  • Item Code: HL-52310
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Item Code:
  • HL-52309
'PHYSILAB' Slip Ring Induction Motor

  • Outer yoke made up of High grade cast iron MS Frame
  • High grade silicon stamping Stator with hydraulically pressed
  • Suitable copper conductor of best quality used for winding for both Stator and Rotor4. Skewed Rotor construction with dynamically balance ensuring low noise
  • Larger size of bearings for longer life and trouble free operations
  • Vacuum pressure impregnation for stator & rotor ensuring high insulation strength
  • Rotor and brake drum Pulley are Dynamically Balanced8. Gun Metal Slip rings with good quality carbon brushes are used
  • All the terminals on terminals Box are properly engraved
  • 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
  • Ratings: For 3ph, 415Volts, 50Hz. 2H.P to 7.5HP
  • Starting Methods: Rotor Resistance Starter with no volt and over load protection.



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  • Item Code: HL-52309
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'PHYSILAB'  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 to IS4722.

Capacity : 0.37 / 0.75kw
Rpm : 2880
Voltage : 230V Single phase AC 50Hz.


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  • Item Code: HL-52308
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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


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  • Item Code: HL-52307
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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.


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  • Item Code: HL-52306
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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


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  • Item Code: HL-52305
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This is a 3-phase AC machine. This is mechanically coupled to a break drum 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.

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  • Item Code: HL-52304
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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



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  • Item Code: HL-52302
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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.

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  • Item Code: HL-52301
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calibrating an ammeter is a broad statement, because the ammeter can be ac or dc. The current ranges can be in ua, or ma, or amp or a few hundred amperes. So there appears to be a wide variety of ranges in current measurement. Since the measurement philosophy is same for any current meter measurement, a dc ammeter is studied for experimental purpose in this experimental setup.

any moving coil meter is a current meter. Normally it is designed to deflect the needle for 100 or 200? A fsd depending on the coil resistance used in the meter. This resistance can be called as internal resistance of the meter. However in reality any electrical or electronic circuits do provide much more current than 100 or 200? A in their circuits, typically anywhere between 1ma to a few amperes. Therefore any current meter that we use in the laboratory do not have this capability. Therefore some extra elements are added to make it appear as though the current meter really reads what we see in the laboratory. Kirchoffs current law will yield better explanation how this is achieved.

calibrating an ammeter is a two step approach. An ammeter is said, to have been calibrated, if it can be tested for

a) accuracy of the basic meter with 100? A fsd or
b) if it is calibrated and displayed on the scale of the meter, for functional applications, like displaying any other parameter with engineering units like a, rpm, kg/cm2 or 0c etc.

in this trainer, all the facilities required to calibrate an ammeter is attempted. While doing so, the above tasks are studied for experimental purposes.

specifications:
analog ammeter : moving coil type
range : 25ma dc fsd
digital meter : 3-½ digit digital ammeter
range : 20ma dc fsd
input voltage source : 5 v dc fixed
load resistor : a continuously variable load resistance in the range of 100 to
5 k ohms using potentiometer method.
shunt resistor : 10k ohm shunt resistor will be supplied.
power supply : necessary built-in power supplies operating at 230v ac mains.
cabinet : an ergonomically designed cabinet


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voltmeter measures voltage across a known source of potential. This voltage measurement can be ac or dc voltage. In case of dc voltage measurement, another variety of the voltmeter is called as center zero voltmeter. The voltage referred on the scale of the voltmeter refers to full-scale deflection (fsd). The fsd indication is always on the right hand side of the instrument. It is necessary to study the name plate details of the voltmeter to identify the type of meter namely moving coil or moving iron type, in addition to fsd. The voltmeter under study is moving coil type ac voltmeter.

calibrating a voltmeter is a two step approach. A voltmeter is calibrated for
i. Accuracy of the basic meter or
(a) calibrate and display on the scale of the meter, for functional applications, like displaying a parameter with engineering units like rpm, kg/cm2 or 0c etc.
now there is a need to study how to accomplish the above-defined tasks. The scope of this instrument restricts to performing the above two tasks only.

this trainer has all the necessary facilities to carryout the experiment needed for calibration. This unit requires an external variac, which can be adjusted in the range of 0 to 230v ac.

specifications:
voltmeter under study : moving coil type
range : 0 to 30 v ac
digital meter : 3-½ digit digital voltmeter
range : 0 to 230 v ac
potential divider : known values of resistors of 1% for calculating the voltage applied
across the device under test.
an external variac required. This is not in the scope of supply with basic experimental setup
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objective:
to conduct hopkinson’s test on the given pair of identical dc machines and obtains item performance characteristics

preview:
swinburne’s test on a dc machine is a non-loading test. The machine performance can be computed from the data obtained from this test without actually loading it. In certain situations a dc machine has to be tested by actually loading it particularly for a heat-run test where the machine is fully loaded for a long period to determine its steady state temperature rise. Such a test may not be feasible for machines of even moderate size and such load test even where feasible is highly wasteful of energy for the heat-run test.

in a manufacturing concern a number of identical machines may be on production line. Two such machines can be put on a test and coupled mechanically. These machines can then be tested by the hopkinson’s test where these two machines are connected in parallel across the supply. By adjusting their excitations both of them can be simultaneously loaded (to any extent) where one machine (motoring) feeds mechanical power to the other machine (generating), while the generating machine feeds electrical power to the motoring machine. The only power drawn from the mains is the losses of both the machines. Load test and heat-run test could thus be conducted with very little energy consumption while the machines carry full load current at rated voltage.

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


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this is a typical setup for conducting experiments on two identical machines, which are mechanically coupled. This requires dc rectifier source of 15 a, for its operation. The dc source to this is provided through a 3-4 point dc starter unit. The coupled dc machine to this dc motor is used as generator. This generator may be loaded by drawing sufficient current using an external loading rheostat. There by loading the dc motor. It is possible to evaluate the performance of this identical machines setup in several ways, for varied parameters.

specifications:

  • dc machines: two identical machines.
  • voltage: 220v
  • amps: 6. 8
  • rpm: 1500
  • kw: 1. 5
  • rating-cmr
  • ins class-b/.
  • extn type: shunt
  • 220v, 0. 5a

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distribution panels are intended to provide necessary ac or dc supplies to the ac or dc machines. There are two different distribution panels available. These are classified as ac distribution panel or dc distribution panel. The ac supply (three phase) to an ac machine is routed through ac panel, and while dc supply is routed through dc panel. This is similar to a distribution board, in function. Each machine gets its ac or dc supply either from the mains or from the rectifier unit respectively, through these panels only. I. E. The supply for each machine is routed through this distribution panel. The supply to each machine is suitably switched on / off through a suitably protected mcb. This provides protection to each machine. Routing supply through these panels allow you to switch on or off using respective switch gear, there by power can be saved, permitting you to switch on the machines which are required for experimentation, and switching off the remaining machines.

specifications:
1. Dc distribution panel:

1. Input: dc voltage input 230v dc from the 100a rectifier unit.
2. Output: 230v dc to respective machines
3. Meters: dc voltmeter and dc current meters are used. The dc meter indicates the overall dc voltage available to the dc circuits. There will be line drop at the respective machines, when measured near the machine. This is due to line loss. The current meter indicates the total current drawn by the whole dc circuit through this panel.
4. Switches: 12 different dc circuits can be connected through this panel. Each circuit is protected with an independent mcb. In addition to this a master switch controls the complete dc circuit. When this is in off position, the dc supply to all the dc circuits are switched off.
5. A lamp indicator is used to display the status of power supply. This is illuminated when the power is on.
6. Separate earth connection is provided to the panel. This must be securely connected to the earth.
7. Enclosure: this is assembled in a sturdy cabinet, using sheet steel.
8. Assembly: this has to be assembled on a rigid foundation next to the dc rectifier unit.

note: you must connect elcbs, earth connections, fuse switchgear, all other protective methods must be implemented, wherever required.


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Experiments In Machines Lab No Load Tests On A Dc Shunt Motor (swinbourns Test)

Objective:to determine the performance of the given dc shunt machine in both generator and motor modes of operation

Preview:
Swinburn’s test is a no-load test on a dc machine. The machine is started and run as a dc motor with shaft decoupled from any load. In this regard the test is very easy to carry out for a machine of any size, particularly convenient for a large machine.
the input to motor at no-load comprises of:
iron losses (pi)

Mechanical, friction and windage loss (pwf)
Field copper loss (pshf)

Armature copper loss
(Armature resistance is measured by drop test and corrected to operating temperature of about 750c)
stray load losses are estimated to be 1% of kw rating of the machine at full – load and considered proportional to square of armature current.
with the above data the machine performance at any load (or a set of loads) can be predetermined either as motor or generator.

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 dc motor 220v 2hp 1500rpm with standard screen protected/drip proof (ip21)
2. 3-4 point dc starters with protectors.
3. Suitable digital voltmeter dc to measure voltage across armature
4. Suitable digital ammeter dc to measure filed current.
5. Suitable digital ammeter dc to measure armature current.
6. Suitable digital tachometer to read rpm of the motor.
7. Suitable rheostat for armature circuit.
8. Suitable rheostat for field circuit.
9. Rectifier unit 0-240v dc @ 1. 5kva with power failure protection.


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Objective:
to start and synchronise the synchronous machine (sm) to the bus bars.
to conduct load test on the sm as a motor
to conduct load test on the sm as a generator


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Objective:- Study of line and load Regulation in DC Regulated Power Suppliers using IC317.
Features:- Instrument comprises of AC Power Supply, 3 meters to measure Output Voltage, Output Current & AC Ripples directly 2 PN junction Diodes, Filter Circuit Kit, Regulation Circuit using IC 317, Load Resistances selectable using bands witch.

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  • Item Code: HL-553
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H. L. Scientific Industries

Yogesh Goswami (CEO)
No. 175/10, Bank Road, Opposite Power House Mohan Lal Building, 1st Floor
Ambala - 133001
Haryana, India
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