Why is differential protection and its functions so important?
Possibly, our country is one of the most cutting-edge in terms of safety regulations in construction .
Thanks to this, buildings and infrastructures have a high constructive quality and contribute to reduce the risks for people.
One cause of this is the mandatory placement of differential protection in electrical installations.
They are elements that prevent accidents and reduce the possible risks derived from them.
Let's see what they are for and what their function is.
Differential protection and its function
Differential protection is the set of elements that are placed in an electrical installation in order to avoid injury to people.
They are automatic devices capable of cutting off the existing electrical flow in a circuit.
The most used are the differential switches.
Estos suelen estar colocados en el cuadro eléctrico y cuando detectan una anomalía en los circuitos como puede ser una fuga en la intensidad de corriente, se encargan de cortar la instalación.
It is the typical case when the differential of a house jumps.
What risks can be avoided
Electrical installations, of whatever type, even if they are well executed and designed correctly, involve a series of risks, either due to their misuse or due to defects produced over time.
The function of the different types of differentials that exist is precisely this: to prevent accidents from occurring and causing harm to people.
The most common risks derived from a bad differential contact are:
- Problemas en los aparatos: A causa del uso o del tiempo, pueden ocurrir problemas de aislamiento capaces de originar la propia destrucción del aparato, un incendio en el circuito o la electrocución en las personas.
- Fires : 30% of fires originating in buildings, whether private or industrial, usually have their origin in electrical problems.
- For people : An electric shock, depending on its intensity, can cause injuries to people such as burns, theming and in more severe cases cardiac arrest or fatal electrocution.
What factors influence the choice of a differential protection
The choice of differential to choose in an installation, is marked according to the type of circuit that you have and the current regulations .
In our country, the regulations require that all the elements of an electrical installation must be approved and for this, they must be installed by a professional capable of meeting all the requirements.
On the other hand, the REBT specifies the characteristics that a high sensitivity differential must have in both domestic and industrial installations.
Regarding the sensitivity of a differential , there are several UNE standards that regulate its specifications.
Its UNE-EN-60947-2 and UNE-EN-60898.
Among other things, they specify that for their installation they must be placed before the activation of the electrical installation.
In general, the installation of an electric differential is carried out taking into account the following:
- Installation surface.
- Nominal intensity.
- Types of devices to protect.
Differential protection is a mandatory requirement that all electrical installations must have to guarantee the safety of both people and appliances and even the buildings or construction types where they are located.
Thanks to them, we will be safer using something as common as electric current in our lives.