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EEE 307 ..
  EEE 308 Practical Experiment No. 2 Matric Number......................... LOAD TEST ON SINGLE PHASE INDUCTION MOTOR AIM: To conduct load test on the given single phase induction motor and to plot its performance characteristics   APPARATUS REQUIRED: Table 1 shows the apparatus and equipment needed for this experiment Table 1 Apparatus list FORMULAE: 1. Circumference of the brake drum = 2ΠR (m) R = Radius of the brake drum 2. Input power =W (watts) W = wattmeter readings 3. Torque (T) = 9.81* R * (S 1 ~ S 2 ) (N-m) S 1, S 2 = spring balance readings (Kg) 4. Output power =   , Where N –Speed in RPM 5. % Efficiency (η) =     x 100 6. Power Factor, Cosθ =   7. % Slip, S =      x 100 8.    =    rpm, Ns is synchronous speed, p is the nos of poles and F is the frequency.   PRECAUTIONS: 1. The auto transformer is kept at minimum voltage position. 2. The motor is started at no load condition. 3. All connections are checked to be tight. 4. Make sure the motor is in a balanced position    PROCEDURE:   1   Connections are done as per the circuit diagram shown in Figure 1 2   The DPST switch is closed and the single phase supply is given. 3   Attach a small piece of laser focus reflecting mark to the side of the rotor if a laser tachometer is to be used or place the tip of the tachometer to a flat surface longitudinal to the surface of the rotor of the machine to be tested 4   By adjusting the variac the rated voltage is applied and the corresponding no load values of speed is noted down. If the wattmeter readings show negative deflection on no load, switch of the supply & interchange the terminals of current coils (M & L) of the wattmeter. Now, again starting the motor (follow above procedure for starting), take readings. 5   The procedure is repeated till rated current of the motor or for several AC voltage levels (like 12 readings). 6   The auto transformer is brought to the minimum voltage position, and the DPST switch is opened. 7 The radius of the machine rotor is measured. Figure 1 Experiment setup    Table 1 Experiment Table 1.   Populate the Table 1 above and plot graphs showing the relationship between: a)   Slip % and Output Power  b)   Power Factor and Output Power c)   Speed rpm and Output Power d)   Torque N-m and Output power e)   Efficiency % and Output Power
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