Product Description
SPD Surge Protective Device, Lightning Surge Protector – DC Surge Protection Device (SPD)
It is a device used to limit instant surge voltage and discharge surge current, at least including a non-linear component. It is suitable for the new energy solar photovoltaic power generation systems or other dc power supply systems of lightning protection, the maximum continuous operating voltage DC500V, 800 v, 1000 v. Installation position in the dc power supply system, always of lightning current and lightning current directly or indirectly other instantaneous overvoltage protection.
Surge protective Device Model Selection
With the impact of international information flow, the rapid development of microelectronic science and technology, communication, computer, and automatic control technology, make the building start to go for high quality, high functional area, forming a new building style-intelligent building. As inside the intelligent building, there are a lot of information systems, <<Building lightning protection design norm>> GB50057-94(2002 vision)(hereafter brief as <<lightning protection norm>>) put forward the relative requirement to install the surge protective device, to ensure the information system safety and stable running.
SPD essentially is an equipotential connection material, its model selection is according to the different lightning protection areas, different lightning electromagnetic pulse critical, and different equipotential connection positions, deciding which kind of SPD is used in the area, to achieve the equipotential connection with the common earth electrode. Our statement will be based on SPD’s maximum discharge current Imax, continuous operating voltage Uc, protection voltage Up, alarm mode, etc.
As per << Lightning Protection Norm>> item 6.4.4 stipulation “SPD must withstand the expected lightning current flow and should conform to the additional two requirements: the maximum clamp voltage during surge across, capable to extinguish the power frequency follow-on current after lightning current across.” That is the value of SPD’s max. clamp voltage adds its induction voltage of two ends should be same with the system’s basic insulation level and the equipment allowed max. surge voltage.
SPD for Power Supply System Series Selection Guide
The installation of SPD at each lightning protection zone, according to the standard of low voltage electrical appearance, makes the classification of electrical equipment in accordance with the overvoltage category, its insulation withstands impulse voltage level can determine the selection of SPD. According to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the overvoltage category as signal level, loading level, distribution and control level, and power supply level. Its insulation withstand impulse voltage level are:1500V,2500V,4000V,6000V. As per the protected equipment installation position different and the different lightning currents of the different lightning protection zone, to determine the installation position of SPD for power supply and the break-over capacity.
The installation distance between each level SPD should not be more than 10m, and the distance between SPD and protected equipment should as short as possible, not more than 10m. If due to the limitation of installation position, can’t guarantee the installation distance, then need to install decoupling component between each level SPD, make the after class SPD be protected by the prior class SPD. In the low voltage power supply system, connecting an inductor can achieve the decoupling purpose.
SPD for power supply system specification selection principle
Max. continuous operating voltage: bigger than protected equipment, the system’s max. continuous operating voltage.
TT System: Uc≥1.55Uo (Uo is low voltage system to null line voltage)
TN System: Uc≥1.15Uo
IT System: Uc≥1.15Uo(Uo is low voltage system to line voltage)
Voltage Protection Level: less than the insulation withstand impulse voltage of protected equipment
Rated discharge current: determined as per the lightning situation of the position installed and lightning protection zone.
SP1 Series
Normal Working Conditions
– Altitude not exceed 2000m
– Ambient air temperature:
Normal range: -5ºC~+40ºC
Extend range: -40ºC~+80ºC
– Relative Humidity: 30% – 90% under indoor temperature condition
– At the place without obviously shaking and shock vibration
– Non-explosion danger medium, non-corrosion gas, and dust ( including conductive dust)
Classification
-As per Nominal Discharge Current:
5,10,20,30,40,60KA(8/20µs)
– As per Maximum continuous operating voltage:
275V,320V,385V,420V,440V,460V
– As per to poles
– As per to poles
1P,1P+N,2P,3P,3P+N,4P
– As per auxiliary functions:
a. With remote signal output ( remote alarm function)
b. Without remote signal output
Selection Principle
– The continuously applied voltage on the two terminals of SPD should not be more than the maximum continuous operating voltage Uc value;
– The voltage protection level Up of SPD should be less than the maximum impulse withstand voltage of the protected equipment;
– The voltage protection level Up of SPD should be less than the maximum impulse withstand voltage of the protected equipment;
– As per the different earthing systems and protection modes select the specification accordingly;
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