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LAB SHEET-Experiment 5Electrotechnic Lab (SME2921), FKE UTM Skudai

Fakulti: FAKULTI KEJURUTERAAN ELEKTRIKNama Matapelajaran : MAKMAL KEJ. ELEKTRIK Kod Matapelajaran : SME 2921

Semakan Tarikh KeluaranPindaan TerakhirNo. Prosedur

: 3: Jun 2010: 2008: PK-UTM-FKE-(O)-08

FAKULTI KEJURUTERAAN ELEKTRIKUNIVERSITI TEKNOLOGI MALAYSIA

KAMPUS SKUDAIJOHOR

SME 2921ELECTROTECHNIC LABORATORY

(Experiment 5)VOLTAGE REGULATION AND

EFFICIENCY OF A TRANSFORMERDisediakan oleh:

1. PM Dr. Azhar bin Khairuddin2. Prof. Dr. Abdullah Asuhaimi Mohd Zin3. En. Alias Mohamad Yusoff4. Dr Saiful Nizam Khalid5. Dr Asiah Mohamad6. PM Md Shah Majid7. Jasrul Jamian8. Madihah Md Rasid

Tandatangan:Cop:

Disahkan oleh: Tandatangan:Cop:

Tarikh:

© 2010 Universiti Teknologi Malaysia – All Rights Reserved

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Tarikh:


I. PRELIMINARY EXERCISE

Important Note: You are required to do this exercise BEFORE the lab session

1. Draw and label complete equivalent circuit of a single phase transformer. From this circuit, draw approximate equivalent circuit of a single phase transformer referred to the primary side.

2. List parameters in the circuit that can be obtained from (i) Open circuit test(ii) Short circuit test.

3. A single phase transformer 240VA 120/120 V is tested on open and short-circuit. The results of the test are as follows:

Open-circuit test: 120 V, 0.6 A, 18 W, the readings on primary.Short-circuit test: 16 V, 2.3 A, 32 W, the readings on secondary.

Calculate:(i) The parameters of the transformer equivalent circuit referred to the secondary

side.(ii) The efficiency and voltage regulation on full load at power factor of 0.8

lagging.

Recommended Reference:

E. Hughes, ‘Electrical Technology’, 7th Ed. , Longman.

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II. EXPERIMENT: .

‘Voltage Regulation And Efficiency Of A Transformer’

1. Aims:

i. To perform an open circuit and a short circuit test. ii. To determine the parameter of transformer equivalent circuit.iii. To calculate the voltage regulation and the efficiency at different loading.

2. Equipments:

i. TT179 Transformer Trainer. ii. PS189 Power Supply. iii. EW604 Electronic Wattmeter.

3. Procedure:

Precaution: Make sure that power supply knob of ps189 at 0 position before starting the experiment.

Open Circuit Test

i. The equipment and the connection for the open circuit test is as shown in Figure 1.0.

ii. Make sure the wattmeter ranges are at 120 V (for voltage range) and 1 A (for current range). The wattmeter reading is the deflection multiply with the voltage range and the current range.

iii. Set the switch position of AC/DC at PS189 to AC.

iv. Pull down the safety lid (cover) and switch ON PS189 and TT179.

v. Increase the output of PS189, until primary voltage (V1) reaches 120 V.

vi. Measure the voltage, current, and power at the primary winding and the voltage at the secondary winding. Record all the results in Table 1.0 (in short report).

vii. Reduce voltage supply of PS189 to zero and then switch OFF TT179.


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Short Circuit Test

i. Before switching on the supply, ensure that the power supply knob of PS189 is at the zero position.

ii. The equipment and the connection for the short circuit test is as shown in Figure 2.0.

iii. Set the load switch of TT179 to the ON position.

iv. Switch on TT179 and increase the output of PS189 gradually so that the ammeter A2 reads 0.5 A. Measure the primary voltage, primary current and power. Record the readings in Table 1.0 (in short report).

v. Repeat the measurement until the load current reaches 2.5 A with an increment of 0.5 A. Record all the readings in Table 1.0. ( CAUTION: the current range for the watt meter must be suitable with the load current)

Figure 1.0


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Figure 2.0


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