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MINISTRY OF EDUCATION AND SCIENCE OF THE REPUBLIC OF KAZAKHSTAN

ALMATY UNIVERSITY OF POWER ENGINEERING AND TELECOMMUNICATION

Department of Power supply and Renewable Energy Sources

Electrical devices

Laboratory work №4

Theme « Research of automatic switch with thermal release and with overcurrent release»

Performed by: Sadan E.

Group: EPEe-15-11

Checked by: Senior Lecturer Amangaliev Y.Z.

Almaty, 2017

The aim of the work: acquaintance with automatic air switch, research of his work in mode overload and short circuit.

The equipment used:

• Module « Fuse and automatic switches »

• Module « Autotransformer »

• Module « Measuring »

• Module « Stopwatch and Lighting Fixture »

• Module « power supply »

• the connecting conductors

The order of performance of the laboratory work

• To research the theoretical material sufficient to perform laboratory work. Answer to control questions and get admission in teacher to laboratory work.

• By the scheme do electrical connection module for research electromagnetic release of automatic switch.

• Setup minimal output voltage of autotransformer, turning the adjustment knob counter-clockwise until it stops. Turn on the automatic switch and switcher of differential current « Power supply ».

• Connect the points 1 and 2 by the help of connecting conductor. With the help of autotransformer TV1 setup current in circuit 3.5A. Remove connection points 1 and 2.

• Turn off QF1. Observe immediate operation. Current value write in table 1.

• Wait the cooling of automate QF1 5 min then repeat it 5 times.

№	1	2	3	4	5
I,A

№	1	2	3	4	5
I,A
T,sec

Conclusion

In carrying out this laboratory work we have become acquainted with the principle of the operation of the determination of the characteristics of a alternating current contactor and how it works. Also we acquainted the theoretical information about contactors and done our laboratory work on the laboratory stand.

At the end of the work we measured all quantities and write down it to our table.

List of references

• Чунихин А.А Электрические аппараты. Общий курс: Учебник для вузов. –М.: Альянс, 2008. -720 с.

• Электрические и электроггые аппараты: Учебник для вузов в 2 томах/ под ред. А.Г. Годжелло, Ю.К. Розанова. –М.: изд-ий центр Академи, 2010. – Т.1 – Электромеханические аппараты. -352 с.

• Электрические и электронные аппараты: Учебник для вузов в 2 томах/ под ред. А.Г. Годжелло, Ю.К. Розанова. –М.: изд-ий центр Академи, 2010. – Т.1 – Электронные аппараты. -352 с.

• Кляйн Р.Я. электрические и электронные аппараты: Уч. Пособие – Ч.1- Физические явления в электрических аппаратах. – Томск: ТПУ, 200-97 с.