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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 №5

Theme « Research of the operation principle of the residual current device (RCD) »

Performed by: Sadan E. Group: EPEe-15-11

Checked by: Senior Lecturer Amangaliev Y.Z.

The aim of the work: acquaintance with the study of the principle of the protective shutdown device.

The equipment used:

• Module « Fuses and circuit breaker »

• Module « Autotransformer »

• Module « Measuring »

• the connecting conductors

The order of performance of the laboratory work

• Research the theoretical material sufficient to perform laboratory work. Answer control questions and get the teacher's admission to perform laboratory work.

• According to the scheme (Figure 11.3), perform electrical connections of the modules for studying the RCD. Installation of production schemes with disconnected power. The current is controlled by the ammeter PA1 of the module "Measuring module". The voltage is supplied from the autotransformer TV2 of the Autotransformer module.

• Set the minimum output voltage of the autotransformer by turning the adjustment knob counter-clockwise until it stops. Turn on the circuit breaker and the differential current switch "Network" of the module "Power module".

• Transfer the RCD QF2 module "Device protective shutdown. Load "in the" I "position. Set the output voltage of the autotransformer UTV2 = 24 V (voltage monitor autotransformer). Verify the operation of the RCD by pressing the "T-Test" button, the RCD (position "0") will be disconnected.

Set the output voltage of the autotransformer UTV1 = 0V. Connect the ammeter PA1 to the circuit in accordance with Figure 11.3. Transfer the RCD to the "I" position. Increase the output voltage of the autotransformer UTV1 until the RCD trips. The current value (PA1) at which the RCD is triggered is the tripping differential current Iut of this RCD instance, which according to the requirements must be in the range of 0.5 Iout-Iout, where Iut.nom is the rated residual current (leakage current on the RCD body).

• After drafting the draft and checking the results the teacher needs to disassemble the scheme, provide the complete set and the right to the teacher or laboratory assistant.

• To draw a conclusion.

Conclusion

In carrying out this laboratory work we have become acquainted with the research of the principle of the protective shutdown device. Also we acquainted the theoretical information about protective shutdown device and done our laboratory work on the laboratory stand. On this stand we set a minimum voltage for founding the current value at which the protective shutdown device is triggered.

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.