Description
The laboratory stand is designed for studying electrical engineering and basic electronics in universities and secondary technical educational institutions.
The stand consists of two parts:
body with electrical equipment, electronic boards, front panel, power pack and table top;
machine unit (spark), containing two electrical machines: asynchronous electrical motor with squirrel-caged rotor and direct current motor with separate excitation. Optical speed sensor is installed on machine unit.
The stand allows carrying out the following laboratory works
1.The study of operation modes and calculation methods of direct current linear circuits with one power supply source.
Subject of inquiry: resistive bridge. In practice the experimental verification of Ohm’s and Kirchhoff’s laws and the equivalent generator concept is carried out.
2.The study of operation modes and calculation methods of direct current linear circuits with two power supply sources.
Subject of inquiry: resistive bridge with the controllable voltage source 0..10V plugged into one leg. In practice the experimental verification of Ohm’s and Kirchhoff’s laws and loop current method is carried out.
3.The study of operation modes and calculation methods of direct current non-linear circuits.
Subject of inquiry: stabistor, parametric voltage stabilizer. The external loading chacteristics of stabilizer and current-voltage characteristics of stabistor are determined in this laboratory work.
4.The determination of parameters and study of operation modes of alternating current electrical circuit with series connection of inductor, resistor and capacitor.
Subject of inquiry: electrical circuit containing series connected inductor (Imax=0,8 А, Lnom=0,25 H), capacitors set (1...63 μF) and active resistance (ПЭВ-50 Rnom=47 Ohm). Chacteristics of inductor substitution circuit are determined in this laboratory work, resonance phenomena are investigated.
5.The study of alternating current power line model under changing load power factor.
Subject of inquiry: power line model with active inductive load. In this work calculation of compensating capacitor and the experiment with reactive power compensation are carried out.
6.Determination of parameters and study of three-phase circuit in wye operation mode.
Subject of inquiry: three-phase alternating current circuit with wye connection. In this work symmetric (with active load 11 Ohm resistance and 200 W power in all phases), uniform (with active, active inductive and active capacitive load with total resistance 250 Ohm in different phases) and non-uniform load (created from uniform when active load resistance is being reduced by changing capacitive load 1...63 μF) with or without zero wire.
7.Determination of parameters and study of three-phase circuit in delta operating mode.
Subject of inquiry: three-phase alternating current circuit with delta connection. The same loads as in laboratory work 6 are investigated.
8.The study of non-sinusoidal periodic current linear circuits containing inductor and capacitor.
Subject of inquiry: circuit with bridge thyristor controllable rectifier as a power source. Harmonic analysis of current and voltage in circuit with controllable active inductive loaded rectifier is carried out in this work.
9.Determination of inductor substitution circuit parameters with closed magnetic flux and air gap.
Subject of inquiry: inductor with closed magnetic flux and gap. Inductor substitution circuit parameters, current-voltage characteristics are determined in this work.
10.Determination of parameters and main characteristics of one-phase transformer.
In this work parameters of transformer substitution circuit are determined, different operation modes are investigated.
11.The study of asynchronous three-phase motor with squirrel-cage rotor.
Mechanical and electromechanical characteristics of motor are determined. As a mechanical load a direct current motor with separate excitation in a dynamic braking mode is used.
12.Determination of parameters and main characteristics of direct current motor with separate excitation.
Mechanical and electromechanical (natural and artificial – rheostatic) characteristics of motor are determined. As a mechanical load an asynchronous motor in a dynamic braking mode is used.
13.Determination of parameters and main characteristics of direct current generator with separate excitation.
External load and adjustment characteristics of generator are determined in this work. Generator excitation current is adjusted with usage of controllable rectifier, load is created by a pulse-duration converter.
14.The study of capacitor charging process from constant voltage source at resistor limited current.
Subject of inquiry: capacitor charge process from constant voltage source at resistor limited current. It’s possible to adjust the current-limiting resistor value.
15.The study of a three-phase squirrel-cage induction motor control circuit.
Subject of inquiry: asynchronous motor typical start circuit with different stator winding connection types (wye, delta, switching from wye to delta).
16.One stage transistor amplifier.
Subject of inquiry: one stage transistor amplifier. In this work influence of transistor operating point’s shift on output signal form is investigated, gain factors with and without bypassing condenser in emitter circuit are determined.
17.The study of two stage amplifiers with direct connection.
Subject of inquiry: two stage amplifier with direct connection. Common emitter and collector amplifiers input/output inner resistance ratio estimation is carried out.
18.The study of parameters of transistor time relay with time setting RC circuit.
Subject of inquiry: transistor time relay with time setting RC circuit. Time relay time characteristics are determined in this work, time delay ratio error is estimated.
19.The study of sinusoidal vibrations generator.
Subject of inquiry: sinusoidal vibrations generator with phase shifting RC-circuit. Vibration excitation conditions, influence of transistor shift on generator operation steadiness and on output signal form are investigated.
20.The study of pulse width converter (PWM) operation.
Subject of inquiry: pulse width converter. Dependence of output voltage on driving voltage is determined in this work.
21.The study of Schmitt trigger operation and integral digital counters.
Subject of inquiry: Schmitt trigger and binary 4-bit counter. Hysteresis with Schmitt trigger switching is investigated, binary counter state table is created.
Technical specifications
Voltage 3~50Hz 220V 3P+PE+N (three-phase five-wire with working neutral and ground conductors with line voltage 220. frequency 50 Hz)
Power consumption, Watt 800
Stand overall dimensions:
Width, mm 1310
Height, mm 1460
Depth, mm 600
Weight, kg 87
Desktop version overall dimensions:
Width, mm 1310
Height, mm 670
Depth, mm 450
Weight, kg 50
Complete set of equipment "Electrical engineering and basic electronics"
laboratory stand;
software;
manual;
passport;
set of jumpers.
