Overvoltage protection devices in the network

problem The main causes of the occurrence of the

The most common overvoltage current in the 220 and 380 volt network occurs for the following reasons:

1. The open circuit of the neutral wire( in the diagram is denoted as N, blue).The purpose of zero is to equalize the current in phases and, accordingly, when it breaks, there is a sudden malfunction, in which some consumers receive less than the required 220 V, and some more, up to 380 V. If in the first case the technique will simply not work correctly, then in the second caseit will simply fail if no protection devices are installed.
2. Inattention when connecting contacts in the switchboard, resulting in overvoltage in the veins - not 220, but 380 V.
3. There was an impulse voltage due to lightning in the power line( that's why it is recommended to turn off all household appliances during a thunderstorm, and also to do lightning protection on the site).
4. Power from one line with a powerful plant, which at some point can launch all of its equipment, creating a huge power surge in the network. Occurs rarely, but some cases have been observed.

As you can see, many factors influence the overload in single-phase and three-phase networks, including natural ones. Therefore, home wiring must be protected in order not to become a victim of an accident.

Devices to solve the

problem In today's world, there are many different devices for protecting against overvoltage in the network, which are easy to connect with your own hands. Products can effectively cope not only with voltage drops, but also with overcurrents, which also have a disastrous effect on home wiring.

Among the most useful for use in the house and apartment are:

1. Stabilizer .It is a kind of fuse, which controls the voltage in the network and in case of its maximum permissible deviation, disconnects electricity in the house. For example, in their experience, they can say that the stabilizer has repeatedly saved our household appliances from the surges caused by welding work passing near. The products range from 150 V and up to 240 V( as an example).As soon as the value is out of this range, the unit turns off. At the same time, when everything is stabilized, the protection device will turn on again. How to connect the voltage regulator, we told in the relevant article!
2. Relay .You probably have repeatedly encountered these devices, which are a miniature version of the stabilizer. Most often the voltage relay is used to protect against overvoltage of one particular unit, for example, a computer. Works on the same scheme as the previous version. Can be represented in the form of an electrical plug( for example, ZUBR), an extension cord and a separate apparatus( all known Barrier), which is attached to the DIN-rail of the shield.
   
   
3. Safety shutdown device .Widely used to protect the network at home, which is caused by high quality work and low cost. The RCD must be paired with a special DPN sensor that will signal a trip if it detects an overvoltage in the network.
4. Uninterruptible Power Supply .Again, my experience will confirm its effectiveness. More than ten times the UPS saved my computer from sudden shutdown when the stabilizer was activated."Bezpereboynik" has a small cost, so buy such a version of protection against overvoltage in the presence of a PC is extremely necessary.

By purchasing all these devices to protect against overvoltage in a 220 volt network, you do not have to worry about the damage to household appliances, electrical wiring and, most importantly, your life in a dangerous situation.

We recommend to read:

• How to connect the diafi-automat
• Reasons for triggering of the RCD
• What is better to put: the Differential or the RCD