Electrical Machinery and Electrical Technique Experimental Equipment

(1) AC power supply

3-phase 0~450V AC power voltage and 0~250V AC power voltage (1.5kVA, 0~450V variable autotransformer) are available; over-current protection at the AC power supply output and short circuit protection between lines and phases are equipped to against changing the fuses. Three AC analogue voltmeters are used for indicating voltages of power grid and adjustment voltage.

(2) DC power supply

DC 220V@0.5A excitation power and 40~250V@3A continuously adjust armature power (with over voltage, over current, over thermal and short circuit protection) are available, with DC digital voltmeter and switches.

(3) Safety

One group of 3-phase isolation transformer to isolate from the power grid;

Voltage mode protection 1: it protects and cut off power supply if there is any leakage before isolation transformer;

Voltage mode protection 2: it alarms and cut off power supply if there is any leakage after isolation transformer;

Current mode protection 1: it curs off the power supply if leakage current exceeds the threshold value;

Fully shrouded connections for protection against hazard of electric shock

(4) Protection on instruments

Many signal ports connected to instruments alarms and cut off power supply if over range.

(5) Timer and alarm recorder with the functions of lab service supervision

(6) Stainless-steel pipes used for easy “lift-in/out??units' removal. 220V and 33V Outlet sockets for application units on base of the panel; single-phase and 3-phase outlet on both sides of the panel provided and one fluorescent lamp (220V, 40W) used for lighting.

Stainless-steel guide rail, optical coded disc, (Omron) and digit-displayed tachometer

Consists of optical coded disc and a digit-displayed tachometer. All components are easy machine coupling on a slide-rail base. The slide-rail has good coaxiality and low noise when the motor is working.

3-phase combination transformer

Consists of three same transformer, primary: 220V@0.35A, secondary: 55V@1.4A

DC compound motor

100W/200V 1600n/min insulated class of E

DC series motor

120W/220V 1400n/min insulated class of E

DC shunt motor

185W/220V 1600n/min insulated class of E

3-phase squirrel-cage induction motor

120W/220V(Δ) 1420n/min insulated class of E

3-phase wound-rotor induction motor

120W/220V(Y) 1380n/min insulated class of E

Start/speed regulation resistor kit for use with 3-phase wound-rotor induction motor

It is used with 3-phase wound-rotor induction motor

3-phase synchronous motor

90W/220V(Y) 1500n/min insulated class of E

DC revised dynamometer

3550W/220V(Y) 1500n/min insulated class of E

DC digital voltmeter, milliammeter, Ammeter

(1) One DC digit-displayed voltmeter: range: 0~1000V overlapping in ranges of 2V, 20V, 200V, 1000V switched by keys, 3 and 1/2 -digit digital display, input impedance: 10MΩ, accuracy: 0.5 %, with over range protection, indication and power cutoff.

(2) One DC digit-displayed milliammeter: range: 0~2000mA overlapping in 20mA, 200mA, 2000mA switched by keys, 3 and 1/2 -digit digital display, accuracy: 0.5 %, with over range protection, indication and power cutoff.

(3) One DC digit-displayed ammeter: range: 0~5A, 3 and 1/2 -digit digital display, accuracy: 0.5 %, with over range protection, indication and power cutoff.

Analogue/digital AC Ammeter

(1) One RMS AC digital ammeter: measurement range: 0~5A, auto-ranging, auto switching, accuracy: 0.5%, 3 and 1/2 -digit digital display, with over range protection, indication and power cutoff.

(2) Two analog AC ammeters: dual calibrations, measurement range: 0~5A overlapping in 0.3A, 1A, 3A, 5A, accuracy: 1.0%, switched by keys, with over range protection, indication and power cutoff.

Analogue/digital AC voltmeter

(1) One RMS AC digital voltmeter: measurement range: 0~500V, auto ranging and auto switching, accuracy: 0.5 %, 3 and 1/2 -digit digital display.

(2) Two analog AC voltmeters: dual calibrations, measurement ranges overlapping in 10V, 30V, 100V, 300V, 500V, input impedance: 1MΩ, accuracy: 1.0%, switched by keys, with over range protection, indication and power cutoff.

Single/three-phase power, power factor meters

Constructed by two microprocessors, high-speed A/D conversion chip and fully digit-displayed circuits. Intelligent control is obtained by keys and digit display. The sample signal of measured voltage and current are sent to DSP after A/D conversion for positive/active power calculation. Measurement of single/three-phase power with accuracy of 0.5% and ranges of voltmeter and ammeters are 450V, 5A. also, data can be recorded and inquiry. The total power is obtained by sum of P1+P2.

3-phase variable resistor

three sets of 90Ω×2@1.3A resistors

3-phase variable resistor

three sets of 900Ω×2@0.41A resistors

Variable resistor and capacitor

One set of 90Ω×2@1.3A resistors and one set of 900Ω×2@0.41A resistors, one 35μF/450V capacitor and 4μF/450V capacitor.

Waveform test & switch board

Consists of waveform test part and two three-pole three-throw switches and one double-pole double-throw switch.

Rotation lights, switch, excitation power supply

Three groups of lamps for synchronization (yellow, green and red), one group of switch and one continuously adjust power supply (5~40V/2.5A).

Intelligent torque/rotation speed/output power tester

Digit-display of rotation speed, output torque and power, and 15 sets of data can be stored, with interface communicated with computer.

AC servo motor unit

The SL series squirrel-cage rotor two-phase servo motor is adopted.

The AC servo motor consists of one RMS AC voltmeter, one RMS AC ammeter, transformer (380V/220V/110V) and variable capacitor (0~6.5uF).

Accessories and connecting wires

PVC-covered pigtail wire with fully protection to avoid electric shock.

Lab Exercises

DC Motor

1. Reorganization experiment

2. DC Generator

3. DC Shunt motor

4. DC Series motor

5. Rotational inertia measurement of rotor

Transformer

6. Single-phase transformer

7. 3-phase transformer

8. Connections and unsymmetrical short circuit of 3-phase transformers

9. 3-phase 3-winding transformer

10. Parallel operation of single-phase transformer

11. Parallel operation of 3-phase transformer

Asynchronous machine

12. Operation characteristics of 3-phase squirrel-cage asynchronous motor

13. Start and speed regulation of 3-phase asynchronous motor

14. Unsymmetrical operation of 3-phase squirrel-cage asynchronous motor

15. Temperature rising of 3-phase squirrel-cage asynchronous motor

16. Rotational inertia measurement of rotor

Synchronous machine

17. Characteristics of 3-phase synchronous generator

18. Synchronization operation of 3-phase synchronous generator

19. 3-phase synchronous motor

20. Parameter measurement of 3-phase synchronous generator

21. Short circuit of 3-phase synchronous generator

22. Unsymmetrical operation of 3-phase synchronous generator

Mechanical characteristics test of motor

23. Mechanical characteristics of DC separately excited motor

24. Mechanical characteristics of 3-phase asynchronous motor

25. M-S characteristics of 3-phase asynchronous motor

Servo machine

26. DC servo machine