Load test on 3 phase induction motor pdf

3. NO LOAD TEST When an induction motor runs at no load, the slip is exceedingly small. This means that R and so current in rotor winding is negligible compared to the magnetizing current. At no load, the equivalent circuit of an induction motor consists of magnetizing branch Xm. This value can be induction motor. 2. To conduct load test on single phase and three phase induction motor. 3. To conduct test on synchronous generator (alternator) to determine the performance characteristics. 4. To conduct test on synchronous motor to draw the performance curves. Course outcomes: At the end of the course the student will be able to: 1. Perform The results of the no-load and blocked rotor tests on a three-phase, 60 hp, 2200 V, six-pole, 60 Hz, Class A squirrel-cage induction motor are shown below. The three-phase stator windings are wye-connected. No-load test Frequency = 60 Hz Line-to-line voltage = 2200 V Line current = 4.5 A Input power = 1600 W Blocked-rotor test Frequency = 15 Hz 3. Locked-rotor Test With the rotor locked, the rotor speed is zero and the per-unit slip is equal to unity. The equivalent circuit is as shown in Figure H.4 or Figure H.5. X 2 R 2 R s X ls V a + - I a Figure H.5 Simplified equivalent circuit of three-phase induction motor under locked-rotor test. X m R r R s X ls V a + - I a X r Stator. The stator is made up of various stampings with slots to carry three phase windings. It is wound for a distinct number of poles. The windings are geometrically divided 120 degrees separated. Two sorts of rotors are used in Induction motors: Squirrel cage rotor and Wound rotor. Rotor voltage is induced in the rotor windings rather than The no load test of 3 phase induction motor is performed on induction motor when it is running without load. This test tells us the magnitude of constant losses occurring in the motor. The set up for no load test of induction motor is shown in the figure. The machine is started in the usual way and runs unloaded from normal voltage mains. This is very important for brush conductivity on the commutator and the current density so the brushes can maintain a certain lubricity when contacting the commutator under load. When an. Chapter 7: Induction Motors 7-1. A dc test is performed on a 460-V Δ-connected 100-hp induction motor . LOAD TEST ON THREE - PHASE SQUIRREL CAGE INDUCTION. Study Resources. Main Menu; by School; by Literature Title. Study Guides Infographics. by Subject; Textbook Solutions Expert Tutors Earn. Main Menu; Earn Free Access Load test on three phase squirrel cage induction motor.doc - LOAD TEST ON THREE – PHASE SQUIRREL CAGE INDUCTION MOTOR Three-Phase Induction Motors Lesson 12a_et332b.pptx 3 Motor Construction Stator Stator - magnetic structure (iron core) and winding that create magnetic field. Connected to three-phase voltages Rotor Rotor - iron core and conductors that rotate and drive the shaft of the motor. Conductors can be either copper bars (squirrel cage) or No load test or open-circuit test. This test is similar to the open circuit test of a transformer. The motor is uncoupled from its load and the rated voltage and frequency is applied to the stator. Since the motor runs at no load, the total input power is equal to constant iron-loss, friction loss, and windage losses of the motor. 1 Lesson 4: Induction Motor Testing: Lock-Rotor and No-load Tests EMCH201 1 Learning Objectives 2 After this p