DC Surge Protection Device ( DC SPD) is designed to limit transient over voltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this over voltage to a value that is not hazardous for the electrical installation and electric switchgear.
Type 2 DC Surge Protection Device ( DC SPD): The Type 2 DC Surge Protection Device ( DC SPD) is the main protection system for all low voltage electrical installations. Installed in each electrical switchboard, it prevents the spread of over voltages in the electrical installations and protects the load.
Nominal Voltage (Un): The nominal voltage stands for the nominal voltage of the system to be protected
Maximum Continuous Operating Voltage (Uc): The maximum continuous operating voltage is the r.m.s value of the maximum voltage which may be connected to corresponding terminals of the Surge Protection Device (SPD) during operations.
Maximum Continuous Operating Voltage for PV System (Ucpv): The maximum continuous operating voltage for Photovoltaic (PC) system is the value of the maximum DC voltage which may be permanently applied to terminals of Surge Protection Device (SPD).
Voltage Protection Level (Up): The Voltage Protection Level is the maximum instantaneous value of the voltage at terminals of Surge Protection Device (SPD).
Nominal Discharge Current (In): The nominal discharge current is the peak value of the current that can be passed through Surge Protection Device (SPD) having a wave shape of 8/20 µs.
Maximum Discharge Current (Imax): The maximum discharge current is the peak value of the current which the device can safely discharge through the SPD having a wave shape of 8/20 µs.
The components of a SPD The SPD chiefly consists of (see Fig.1): 1) one or more nonlinear components: the live part (varistor, gas discharge tube, etc.); 2) a thermal protective device (internal disconnector) which protects it from thermal runaway at end of life (SPD with varistor); 3) an indicator which indicates end of life of […]
The IEC 62305 standard parts 1 to 4 (NF EN 62305 parts 1 to 4) reorganizes and updates the standard publications IEC 61024 (series), IEC 61312 (series) and IEC 61663 (series) on lightning protection systems. Part 1 – General principles This part presents general information on lightning and its characteristics and general data, and introduces […]
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