ZE3413 Stand For Laboratory Work on The Course "Electrical Machines" School Educational Equipment Vocational Trainer Workbench Electrical Training EquipmentDescription
The laboratory bench is designed for laboratory works to study electrical machines in universities and specialized schools.
The construction of the bench consists of a case with the following equipment installed: electrical equipment, electronic circuit boards, front panel and integrated desktop tabletop.
The following equipment is placed inside the case:
rectifier board;
load resistors module;
three-phase laboratory transformer;
three-phase transformer investigated.
Electrical schemes of the objects investigated are shown on the front panel. All the schemes shown are divided into groups in accordance with the theme of laboratory work conducted. On the front panel installed: commutation sockets, analogue panel meters, commutation equipment and controllers, which allow to change options of the elements during conduction of laboratory work.
The bench provides the conduction of the following labs:
1. Study of two winding power transformer with the use of open circuit and short circuit methods.
Investigation of single-phase transformer in various modes, the determination of the equivalent circuit parameters and rating the transformer external characteristics.
2. Experimental determination of three-phase two-winding transformer connection groups.
Study of vector diagrams of voltage for different connection patterns and experimental determination of three-phase transformer connection group.
3. Study of three-phase asynchronous motor with squirrel-cage rotor.
Study of construction and characterization of three-phase asynchronous motor with squirrel-cage rotor using methods of open circuit, short circuit and immediate loading.
4. Study of methods of three-phase asynchronous motors with squirrel-cage rotor start-up.
Study of three-phase asynchronous motors startabilities, circuit assembly and rating static and dynamic characteristics of motor start-up.
5. Study of DC generator with parallel excitation.
Study of the operating principle and characterization of DC generator with parallel excitation.
6. Study of DC generator with separate excitation.
Study of the operating principle and characterization of DC generator with separate excitation.
7. Study of DC motor with parallel excitation.
Study of the operating principle and characterization of DC motor with parallel excitation.
8.The study of single-phase transformer.
The object studied: single-phase transformer. During the laboratory work idle, short circuit, load operation states are studied and external characteristics of the transformer are measured.
9.The study of three-phase transformer.
The object studied: three-phase transformer. During the laboratory work idle, short circuit, load operation states are studied and external characteristics of the transformer are measured.
10.The study of three-phase transformer joint groups.
The object studied: three-phase transformer. During the laboratory work the transformer primary and secondary windings voltage radio is studied when windings 0, 5, 6, 11 are jointed into groups.
11. The study of separately excited DC motor.
The object studied: separately excited DC motor, loaded DC motor in dynamic breaking mode. During the laboratory work operating and control characteristics of the motor are measured.
12.The study of separately excited DC generator.
The object studied: DC generator rotated by DC electric motor. During the laboratory work idle, external and control characteristics of the generator are measured.
13.The study of asynchronous motor with squirrel-cage rotor.
The object studied: asynchronous motor with squirrel-cage rotor loaded with DC motor in dynamic breaking mode. During the laboratory work operating and mechanical characteristics of the motor are measured.
14.The study of selsyns in indicator and transformer operation modes.
The object studied: selsyns in indicator and transformer operation modes. During the laboratory work the operation of selsyns in indicator and transformer modes is studied.
Bench technical characteristics:
Voltage ~220 50Hz / 3~50Hz 220V 3P+PE+N
Power consumption, W 250 / 1 kWt
Measuring system technical characteristics:
Number of parameters displayed on the bench 15 pcs. (12 indicators)
Voltmeters 4 pcs.
Ammeters 6 pcs.
Phase meters 1 pc.
Velocity meters 1 pc.
Wattmeters 2 pcs.
Frequency meters 1 pc.
Range of measured voltage from ±1 V to ±750 V
Range of measured current from ±1 mА to ±5 А
Range of measured velocity from ±1 rad/s to ±314 rad/s
Range of measured frequency from 0 Hz to 163 Hz
Measurement accuracy, up to 1%
Pulse-width converter technical characteristics:
Rated current ±5 А
DC link voltage 300 V
Converter frequency 8 kHz
Current overload ±7 А
Frequency converter technical characteristics:
Motor power: 0,4 kW / 1.5 kWt
Rated current: 7 А
Output voltage operating range 3~ 220 V
Control method: sinusoidal PWM (control U/f, independent)
Frequency control range: from 0 to 163 Hz
Frequency resolution: 0,3 Hz
Overload margin: 150% of rated output current during 1 minute (integral dependence)
Complete set of equipment NTC-06.01 "Electrical machines":
Measurements are carried out with analogue panel meters. There are 10 panel meters installed on the front panel of the bench, among them are:
AC ammeter (measurement limit 0,2/0,5/1 A, accuracy class 2,5) 1 pc.;
DC ammeter (measurement limit 1A, accuracy class 2,5) 2 pcs.;
DC ammeter (measurement limit 0,2A, accuracy class 2,5) 1 pc.;
AC voltmeter (measurement limit 100V, accuracy class 1) 1 pc.;
DC voltmeter (measurement limit 200V, accuracy class 1) 1 pc.;
AC wattmeter (measurement limit 40/450W, accuracy class 2,5) 1 pc.;
RPM meter (measurement limit 5000 rpm, accuracy class 4) 1 pc.
The laboratory bench is supplied with the following methodical support: methodical and technical documentation set for teaching staff.
