EPS 1POLE + N AND 3POLE + N 40KA VOLTAGE SURGE PROTECTOR / SURGE PROTECTIVE DEVICE
EPS VCT - T2
Uc : 275VAC
Imax : 40kA
In : 20kA
Up :< 1.5kV
A - Overvoltage of atmospheric origin propagation modes
1) Direct Attack
This occurs at the point of impact and may result in powerful currents flowing through fairly conductive elements .
2) Indirect Attack
These occur most frequently , where a single direct attack at a point can generate overvoltage at a distance which are then propagated via the electrical supply right inside the building and can damage the installation and electrical equipment .
a) Overvoltage on overhead power lines
when lightning strikes a high or low-voltage overhead power line and creates an overvoltage of several thousand volts and a current of a several thousand amps .
b) Overvoltage due to electromagnetic coupling
when lightning strikes in the vicinity of an electrical supply creates an overvoltage caused by electromagnetic radiation which is propagated to the building electrical installation directly or via the electrical supply .
c) Overvoltage from the earth system
when a lightning strikes the ground and generates an increase in the earth system potential which is feedback to the installation .
B - Overvoltage of non-atmospheric origin
These are overvoltage resulting from operation on equipment such as : motor ( lift ) , sodium lamps , etc. .
C - Effects of overvoltage
There are two types of overvoltage
overvoltage between the supply and the metal structure or earth system : these result in the creation of an electrical arc between the supply and earth , this results destruction of the consumer unit .
overvoltage between phase and neutral these damage the actual electrical appliance.
