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No Load and Blocked Rotor Tests On Single Phase Induction Motor

This document outlines procedures for conducting no-load and blocked rotor tests on a single-phase induction motor to determine its equivalent circuit parameters. The no-load test involves applying rated voltage to the motor with its rotor free to rotate and recording various meter readings. The blocked rotor test applies rated current with the rotor blocked and also records meter readings. Calculations are then performed to determine the motor's resistance, reactance, and other parameters based on the test results.

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Dhivya N
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583 views5 pages

No Load and Blocked Rotor Tests On Single Phase Induction Motor

This document outlines procedures for conducting no-load and blocked rotor tests on a single-phase induction motor to determine its equivalent circuit parameters. The no-load test involves applying rated voltage to the motor with its rotor free to rotate and recording various meter readings. The blocked rotor test applies rated current with the rotor blocked and also records meter readings. Calculations are then performed to determine the motor's resistance, reactance, and other parameters based on the test results.

Uploaded by

Dhivya N
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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Exp No: Date:

NO LOAD AND BLOCKED ROTOR TESTS ON SINGLE PHASE INDUCTION MOTOR


AIM:
To conduct the No load test and Blocked rotor tests on single phase squirrel cage induction motor and to find its equivalent circuit parameters.

NAME PLATE DETAILS:


Entity 1 In !"tion #oto$ A!to t$an%&o$#e$

'USE RATING:
No load: 30% of rated current (Full load current !oad: "#$% of rated current (Full load current

APPARATUS RE(UIRED:
S)No ". #. 3. +. $. ,. 0. 2. 7. Appa$at!% %mmeter %mmeter *oltmeter *oltmeter *oltmeter -attmeter -attmeter 'apacitor Tachometer Type &' &) &) &) &' !.F 1.F 3lectrol4tic ( Ran*e (0("0% (0("0% (0("$0* (0(300* (0($0* (300*/ "0% ("$0*/ "0% ++0*5#06f ( (!antity " " " " " " " " "

PRECAUTION:
The autotransformer should 8e kept at minimum voltage position.

PROCEDURE:
'onnections are given as per the circuit diagram 9uppl4 is s:itched on. )n no(load or open circuit test/ 84 ad;usting autotransformer/ the rated voltage is applied and all the meter readings are noted do:n (in this test/ rotor is free to rotate .%utotransformer is 8rought to initial position and suppl4 is s:itched off. )n short circuit or 8locked rotor test/ 84 ad;usting autotransformer/ the rated current is supplied and all the meter readings are noted do:n (in this test/ rotor is 8locked and not allo:ed to rotate %utotransformer is 8rought to initial position and suppl4 is s:itched off. The stator resistance of motor is measured using ammeter(voltmeter method . TABULATION FOR NO LOAD TEST ON 1 INDUCTION MOTOR 9peed of the induction motor < &ultiplication factor < S)No Open "i$"!it +o,ta*e -.o/ .o,ta*e Open "i$"!it "!$$ent -I0/ A#p% Open "i$"!it Po1e$-2o"/ O3%e$+e 2att% A"t!a, 2att%

TABULATION 'OR SHORT CIRCUIT TEST ON 1 INDUCTION MOTOR &ultiplication factor < S)No S4o$t "i$"!it +o,ta*e -.o/ .o,ta*e S4o$t "i$"!it "!$$ent -I0/ A#p% S4o$t "i$"!it Po1e$-2o"/ O3%e$+e 2att% A"t!a, 2att%

SAMPLE CALCULATION:
OC TEST: ". No load po:er factor (cos =0 < -oc5*0)0 *0 > No load voltage in volts )0 > No load current in amps -oc > No load po:er in :atts.

#. -orking component current (): < )0 cos =0 %

3. &agneti?ing current ()m < )0 sin =0 %

+. No load resistance (@0 < *05)0 cos =0 (A

$. No load reactance (B0 < *05)0 sin =0 (A SC TEST: ,. &otor equivalent )mpedance referred to stator (Csc < *sc 5 )sc (A

0. &otor equivalent @esistance referred to stator (@sc < -sc 5 )#sc (A

2. &otor equivalent @eactance referred to stator (Bsc < (Csc# > @sc#

"5#

(A

7. @otor reactance referred to stator (B#D < Bsc 5 # < B" (A -here @" > stator resistance B" > 9tator reactance @" < @ac < "., E @dc

"0. @otor resistance referred to stator (@#D < @sc >@" "".&agneti?ing reactance (Bm < # (B0<B"(B#D5# "#.9lip (9 < (Ns ( N 5 Ns -here Ns( s4nchronous speed in rpm N > speed of the motor in rpm.

@esult:

)nference:

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