Purpose and principle of operation of the voltage relay

In order to protect their network, and in particular expensive equipment connected to the network, it is desirable to set the voltage switch. It will de-energize your wiring in the event that voltage is dangerously low or high. In this article I will tell you of any force majeure, it will protect your equipment and tell how it works.

What does the voltage relay

This relay is used for instantaneous power failure in a network if it goes beyond the set parameters. The default settings on virtually all relays should range from 170 to 260 volts.

That is, if the voltage drops below the critical level of 170 volts or rises above 260 volts, there will be off, and has a team on the inclusion of the relay will arrive only if the indicator enters the voltage norm.

Because of what can trigger relays

Causes sudden voltage changes in your wiring may be the following:

1. Wire break occurs overhead power line and the phase (L) is carried perehlestnut zero (N). In this case signified phase voltage is 220 V becomes a linear - 380 as now will be present at the origin of opposite phase.

2. Interruption of the neutral conductor - the most common cause. Since before the entry into the house or apartment we have with you everywhere is a three-phase system with three phases L1, L2, L3 and the neutral conductor N. And breakage neutral conductor can provoke dangerous phenomenon such as a phase shift, i.e. one phase may be a voltage less than 170 V, and on the other it will increase more than 260 V.

3. Due to the inclusion of a powerful consumer per phase may be undervoltage. Which also provoke distortions phases and therefore over- or under-voltage.

The operating principle of voltage control relays

This relay is designed for installation in a standard box and has a fastening Din-rail. The internal structure of the relay is divided into two parts: an electronic control unit and control, as well as an electromechanical unit.

The main function of the electronic unit constantly monitoring the voltage level in the network and in the case of setting parameters for setting the output unit supplies a pulse to the solenoid body. And he, in turn, turns off the power.

types of relay

RNPP-311 - three-phase voltage relay

This version is designed for installation in a three-phase network

Excellent for protection of three-phase motors.

RN-101 - autonomous relays

For example, if you have rented expensive equipment, and your network is not necessary voltage relay, but you still want to best protect the equipment, this portable unit simply perfect decision.

This model has the following parameters: the minimum set point ranges from 160 to 210 V, the maximum set point ranges from 230 to 280 V. A reclosing time can be set in the range of from 5 to 250 seconds.

RN-111 - voltage relay for installation in distribution boards.

This modification has a special attachment for DIN - rail mounting. This relay also monitors the voltage in a rather wide range and is capable of self-break circuit up to 3.5 kW load. If the network is loaded stronger, together with the relay should be mounted magnetic switch.

Extension Zubr - P316y

If you need to protect several devices at the same time, this modified carrying ideal. It also is designed for a maximum capacity of 3.5 kW.

Whether such lightning protection apparatus

I'll tell you right away - no. Voltage relay can only operate in the range of 100 to 400 volts. A lightning strike is able to convey the supply voltage in the tens or even hundreds of millions of volts. Lightning protection, there are other types of protection, namely the surge.

Checking voltage relays

Unfortunately, to check at home simple way is almost impossible. Therefore, when buying goods in a specialty store is required to check and, if necessary, ask for a guarantee from the seller.

Check the product can be by a laboratory test equipment. Gathering with simulated load circuit by controlling the applied voltage, it is possible to fix the operation voltage depending on the exposed setpoint.

As you can see, the voltage relay - is not just a waste of your money, it is a tool with which you can protect against damage your expensive equipment. But to put or not the voltage relay in my house matter.

Thanks for attention.