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Previous video: Аврал 3 - программа расчета токов короткого замыкания. Быстрый старт.Next video: ✅На что способно напряжение сети 220 Вольт если воткнуть не туда куда надо))

0:00

Приветствие

0:25

Вступление

1:01

Формула силы тока

1:45

Пример внештатной ситуации

2:27

Определение

3:00

Негативные последствия данного явления

3:22

Закон Джоуля Ленца

3:46

Защита от КЗ

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00:00:04

the kobelev company presents to your

00:00:07

attention a video about a short circuit, a

00:00:11

video prepared with the participation of products

00:00:13

manufactured by the hager company,

00:00:18

consider it, don’t forget to subscribe to

00:00:20

our channel and other social networks,

00:00:26

first of all, let’s look at what happens when you

00:00:29

connect an electrical appliance to the network in

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normal mode, when it is turned on, the

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electrical circuit is closed and along it

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electric current begins to flow, then the

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electrical appliance converts the received

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electricity into another type of energy,

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for example into mechanical or thermal, the

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circuit functioned in normal

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mode to transmit electricity,

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conductors are selected

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for a certain current strength according to Ohm's law,

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as can be seen from the formula, the current strength is directly

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proportional to the voltage in the network and

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inversely proportional resistance

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that an electrical appliance creates, let

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us assume that the total resistance of the

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washing machine is 25 o mA, which

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means the current consumption is about

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9 amperes. Therefore, to power such

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electrical appliances, it is necessary to use a

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cable with conductors that

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would withstand a current of at least 9 amperes for a long time; to

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power the washing machine, a

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cable with conductors with a cross-section of

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2.5 square millimeters, the long-term

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permissible current of which is 27

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amperes.

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Next, let’s consider an emergency situation: the

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neighbors above have a broken

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water supply system and the water from above is moving

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towards the socket in which the washing machine is plugged in.

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As you know, water is a

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good conductor and when it comes into contact with the

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socket contacts, the same as and the washing

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machine closes the circuit

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since the electrical conductivity of water is

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quite high, then as a result of its

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resistance is very small and as

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you know, the current flows along the path of least

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resistance and an

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electric arc is formed between the plug contracts

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which will create a short circuit, in

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simple terms, a short

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circuit is any unplanned

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abnormal connection of electrical

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conductors with different potentials,

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for example, phase and 0, at which

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destructive Tokyo is formed.

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It is important to note that a short circuit in an

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electrical circuit

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is precisely an unplanned,

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unforeseen process, since

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some electrical appliances are powered

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using a controlled circuit or

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can even operate in short circuit mode,

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but you may ask what’s wrong with

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let’s understand this phenomenon, let’s assume that the

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resistance of water is

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from 0.7 m and turn to Ohm’s law, then

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we substitute the formula for the value

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as can be seen in case of a short circuit, the current

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will be approximately 320 8 amperes such a

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large current, according to the Joule-Lenz law, will

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release a huge amount of heat

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as conductors and electrical equipment not

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designed for such a current, the insulating

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layer will melt and prolonged

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exposure to such a short circuit

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can even lead to a fire.

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Protection against short

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circuits, how can you protect yourself in such a situation? To protect circuits from short circuits, fuses are

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provided,

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but most often in apartment electrical panels,

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automatic switches or circuit breakers are used

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difavtomats

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these devices have their own

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design of an electromagnetic release

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that reacts to the instantaneous

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occurrence of an overcurrent in the circuit

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created by a short circuit and

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opens the contact in more detail about the

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design and principle of operation of the machine and

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difavtomat and you can watch in our

00:04:25

previous videos

00:04:26

in this video we talked about

00:04:29

short circuit protection

00:04:30

leave comment like and

00:04:33

subscribe to the channel so as not to

00:04:35

miss new videos

Description:

Что такое короткое замыкание? Защита от короткого замыкания. Ставьте "лайк" и подписывайтесь на канал! Видео "Что такое ток?" - https://www.youtube.com/watch?v=_AfSnPL7Psk Видео "ТОП ошибок электрика" - https://www.youtube.com/watch?v=a7tS4REhYKk Видео "Типы электрических схем" - https://www.youtube.com/watch?v=bHAyhTuT37I Наш сайт - https://cable.ru/ Кабель.РФ® в Telegram. Подпишись! https://t.me/cable_ru Наши сообщества в социальных сетях: "Вконтакте" - https://vk.com/cable_ru "Одноклассники" - http://ok.ru/cable "Facebook" - https://www.facebook.com/unsupportedbrowser "Instagram" - https://www.facebook.com/unsupportedbrowser "Яндекс Дзен" - https://dzen.ru/cable_ru Понравилось видео? Подпишись на наш канал - https://www.youtube.com/user/Kabelrf 00:00 Приветствие 00:25 Вступление 01:01 Формула силы тока 01:45 Пример внештатной ситуации 02:27 Определение 03:00 Негативные последствия данного явления 03:22 Закон Джоуля Ленца 03:46 Защита от КЗ

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