Engineering, Polytechnic and Vocational Training Equipment-> Electrical Engineering Laboratory

[1] 2 3 [ Next»]   Click to Enlarge INSTRUMENTS AND EQUIPMENTS USED IN ELECTRICAL LABORATORY. 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. See Enlarge Click to Enlarge PORTABLE VARIAC This is a variable auto transformer. This is also called as Dimmer-stat. This is used to vary the output voltage by rotating a knob placed above this instrument. The output voltage can be varied from 0 to 270V AC, when its input terminals are connected to 230V AC. It can deliver 6A of current at its peak rated voltage. The entire instrument is assembled in a sheet rolled powder coated MS metal box with separate screw terminal for earth connection. Specifications: Input: 230 V AC Output: Variable in the range of 0 to 270V AC. Rated capacity: 6A See Enlarge Click to Enlarge LOADING CAPACITOR Loading capacitor, is a capacitor bank with step variation. This is required when experimenting to determine the output characteristics of devices like a transformer etc. More particularly while experimenting to determine the power factor measurements in single-phase electrical circuits. This is a loading capacitor, where by the capacitance in a load circuit can be varied in the range of 2uF to 16uF @ 230V AC, in 8 steps. The variation in capacitance can be obtained by suitable patch cord mechanism. This is suitably protected with necessary fuse arrangement. The terminals are suitably brought out on a 4mm Banana sockets for easy interconnections. See Enlarge Click to Enlarge 3 POINT DC STARTER 3 point DC starter is a unit intended to limit the starting current in a DC circuit. This starter is a must for any DC motor applications. This starter has three functions. (a) To provide series resistance in a DC circuit when this starter is in START position. I.e. In STARTposition full resistance is included, and is reduced to zero ohms when the handle is moved to ON position, in discrete steps. The starter is held in ON position by an electromagnet. At this ON position the DC circuit gets its full current from the DC Rectifier unit. In the case of a DC motor, this is connected in series with the armature circuit, to limit the starting current and eventually this resistance is CUTOUT, from the circuit. There by enabling the motor to run at it?s full armature current. Therefore this starter acts as a first order protection circuit, in between a DC rectifier unit and the DC circuit. (b) No Volt Coil (NVC) ? This is normally connected to Field circuit in a DC motor. In case of a failure in current in this circuit, for any reason, namely accidental tripping, or unintentional break in field circuit, this coil will provide a signal to the electromechanically held arm (handle) to release, and the starter is switched to OFF position, thereby providing safety to the system. (c) Over Load (OL) release switch ? This is connected in series with the armature circuit. In case of current beyond the rated current of this coil in the circuit, this automatically trips the electromagnet, which is holding the handle in ON position. Thereby tripping the starter from being over loaded See Enlarge Click to Enlarge METERS Varieties of meters are available for making suitable measurements of electrical parameters. These meters are available for use in single phase and three phase circuits. The meters are available in tabletop models and panel mounting arrangements. Normally these meters are used in Electrical engineering laboratories for various measurements. The meters available are 1. Volt meters- analog /digital 2. Ammeters – analog / digital 3. Watt-meters – analog / digital 4. Phase sequence indicators 5. Tacho meters – contact type and photo reflective type 6. Reed type frequency meters 7. Phase meters. 8. Power factor metes. See Enlarge Click to Enlarge MEASUREMENT STATION This is an AC measuring digital instrument station. This is a typical laboratory instrument station. This has 3 meters. It measures the a. frequency in the range of 0 to 99Hz, b. Voltage in the range of 0 to 500V AC, and c. Current in the range of 0 to 5A AC. The entire instrument is assembled in a compact and sleek looking cabinet for convenience. See Enlarge Click to Enlarge MACHINES LABORATORY. DC MOTOR This DC motor is integral, internally mounted cooling fan on the shaft. When the motor is running at rated speed the, fan provides the necessary cooling to give the assigned rating. When motors are required to start from zero speed and smoothly accelerate to the rated speed, these motors can be selected. If motors are to run below rated speed for long duration, either they have to be de-rated or can be forced cooled. The DC Generators are normally continuously rated and have to run at rated speeds only. This requires DC rectifier source for its operation. The DC source to this is provided through a 3-4 point DC starter unit. Using this, several experiments on DC motor can be conducted. Depending on the experiment, you need appropriate meters, rheostats, switchgear are required. These motors are screen protected, with IP21/IP22 enclosures. Specifications: Voltage: 220V Amps: 6.8 RPM: 1500 KW: 1.5 Rating-CMR INS Class-B/. Extn type: Shunt 220V, 0.5A See Enlarge Click to Enlarge 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. See Enlarge Click to Enlarge IDENTICAL MACHINES 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 See Enlarge Click to Enlarge 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 See Enlarge Click to Enlarge SYNCHRONOUS ALTERNATOR This is a synchronous alternator generator experimental setup. Both are mechanically coupled. This setup is used to perform experiments on synchronization. A DC motor is used as prime mover. This experiment is better understood when connected to a synchronizing panel. See Enlarge Click to Enlarge SYNCHRONIZATION PANEL This is a synchronization panel. This panel is used to study the synchronization of an alternator with main bus bar voltages. While performing this experiment, it is required to study the dark / bright lamp method for synchronization. In order to facilitate this, the panel is provided with two voltmeters, two frequency meters, one synchro-scope, 6 lamps, phase sequence indicator and a selector switch provides for synchronization. 3 sets of 4mm terminals are provided for making necessary RYB connections. See Enlarge Click to Enlarge 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: PM100L See Enlarge Click to Enlarge 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. This is an arrangement of a 3-phase induction motor, mechanically coupled to a DC generator. See Enlarge Click to Enlarge 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. This is an arrangement of a 3-phase induction motor, mechanically coupled to a DC generator. See Enlarge [1] 2 3 [ Next»] Go to Top