АНГ 2 Relay protection / lesson1_task2
.docxМинистерство образования и науки Российской Федерации
Федеральное государственное автономное образовательное учреждение высшего образования
«Национальный исследовательский Томский политехнический Университет»
Центр цифровых
образовательных технологий
13.03.02 «Электроэнергетика и электротехника»
Individual Task 2. LESSON 1
по дисциплине:
Professional English for Electrical Power Engineering. Part 2. RelayProtection
Исполнитель:
|
|
||||
студент группы |
5А93 |
|
Кутонов В.С. |
|
17.02.2022 |
|
|
|
|
|
|
Руководитель:
|
|
||||
доцент ОЭЭ ИШЭ |
|
|
Рубан Н.Ю. |
|
|
|
|
|
|
|
|
Томск - 2022
What is the operation principle of electromechanical relay?
An electromagnetic relay is a relay that responds to the magnitude of an electric current by attracting a ferromagnetic armature or core when current passes through its winding.
The main parts of an electromagnetic relay: an electromagnet, an armature and a switch. An electromagnet is an electrical wire wound on a coil with a yoke made of a soft magnetic material. Armature - usually a plate of magnetic material, through the pushers acting on the contacts.
In the initial position, the anchor is held by a spring. When a control signal is applied, the electromagnet attracts the armature, overcoming its force, and closes and / or opens the contacts, depending on the design of the relay. After turning off the control voltage, the spring returns the armature to its original position. Some models may have built-in electronic components. This is a resistor connected to the coil winding for a more precise operation of the relay, or (and) a capacitor parallel to the contacts to reduce sparking and noise, or a semiconductor diode that serves to block overvoltages on the relay winding when it is de-energized due to electromagnetic induction.