Switching from normal operation to emergency power operation in a data center carries the risk of surge voltage couplings in the server room. In order to minimize this risk, a type 1+2 SPD (Surge Protection Device) is used.
The SPD arrangement shown left is called shunt surge protection whereby the SPD is connected in parallel with the load. The limitation of this type of protection is that while the surge voltage is controlled to a manageable level, these devices do not lower the voltage rise time of the incoming surges.
Type 2 surge protection prevents failures caused by overvoltages. These protective devices discharge overvoltages up to a maximum discharge surge current of 40 kA and have a maximum voltage protection level of 1.5 kV.
The surge protective device (SPD) is additionally monitored with ImpulseCheck to ensure feed-in is protected. ImpulseCheck detects any pre-existing damage to the SPDs and reports the condition of the protective devices to the control room.
We will look at sensitive locations that benefit from the installation of lightning and surge protective devices in more detail below. A type 1+2 combined lightning current and surge arrester provides the
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