Overvoltage protection

Risk of overvoltage

Overvoltage can destroy electrical devices and systems. Damage is not limited to industrial plants. Building systems and devices used in homes can also be affected.

The total worth of electrical equipment in businesses and private households is at least a five-figure amount in euros. Severe damage can occur if overvoltage reaches the electrical network of buildings. Without effective protection measures for overvoltage you may end up in spending a fortune on repair costs or new equipment.

Effective protection concept

An effective protection concept against overvoltage covers the range of power supply, information and telecommunication technology, transmission and receiving equipment as well as control technology for heating systems. It is important to protect all connections of a device. Therefore, you draw a theoretical circle around a protectable device.

All wires, which are intersected by the circle, should be protected with an overvoltage protection. For example, a TV’s power supply and the aerial socket (cable or SAT).

Power supply

An overvoltage protection concept for your power supply should generally cover three stages. A lightning stroke current arrester (type 1) in the main distribution board, a lightning arrester (type 2) in the sub-distribution and the device protection (type 3) prior to particularly vulnerable devices, like PC’s or hi-fi systems.

Low-rise buildings in the middle of a residential area that have no lightning protection systems or other grounded metal components have a statistically low risk of being struck by lightning strike. In this case, the first stage of protection (type 1) can be omitted and you can start with the lightning arrester (type 2). This kind of protection unit is installed after the electric meter or in the sub-distribution. A device protection (type 3) should always be installed next to the device to be protected.

This kind of device protection is available in different configurations to offer the right solution for every need.
SPD Power

Signal interfaces

Protective devices are installed prior to signal interfaces like ISDN/telephone connections, broadcast antennae or television aerials, broadband cables and the outdoor sensors of heating systems. The signal is transmitted via the circuit of the protective device; overvoltage that might reach the interface via the signal line is effectively limited.

[Quelle: phoenixcontact]