The parameters of the surge protector are the important basis for the selection of the surge protector. Designers who use the surge protector when designing electrical engineering drawings also need to consider the parameters of the surge protector. Then, the following detailed analysis of surge protector parameters.
Surge protector parameters
1, the maximum continuous operating voltage Uc
When SPD is selected in 220/380V three-phase system, the maximum continuous operating voltage Uc should be selected according to different grounding system forms.
(1) When the power supply adopts the TN system, the TN-S system must be adopted for the distribution lines and branch lines that are led from the main distribution board (box) in the building;
(2) The above stated Uc value shall be increased for the zinc oxide varistor SPD in the following places;
1 where the supply voltage deviation exceeds the specified 10%;
2 Harmonic places that increase the voltage amplitude.
2. Inrush current Iimp
The provisions include amplitude current Ipeak and charge Q.
3, nominal discharge current In
The peak current flowing through SPD and 8/20μs current wave is used to do the class II classification test for SPD, and it is also used for the pretreatment of SPD for class I and class II classification tests. The class I classification test In should not be less than 15kA, Class II classification test In should not be less than 5kA.
4, voltage protection level Up
That is, the residual pressure at the nominal discharge current In, or the maximum clamp pressure of the surge protector.
In order to protect the protected equipment against overvoltage, the voltage protection level of the SPD should always be less than the impact withstand voltage Uchoc of the protected equipment, and should be greater than the maximum operating voltage Usmax derived from the ground type, that is, the requirement Usmax. 5, the maximum discharge current Imax II class test Peak current flowing through SPD, 8/20μs current wave. For Class II classification experiments, Imax> In. Surge Protector Installation Methods and Requirements 1) Determine the discharge current path 2) Wire marking the extra voltage drop caused at the device terminal 3) To avoid unnecessary induction loops, PE conductors of each device should be marked 4) Establish equipotential bonding between the device and HYC1 5) To carry out multi-level HYC1 energy coordination Surge protectors classified by operating principle (1) Switch type: Its working principle is that it exhibits high impedance when there is no instantaneous overvoltage, but once it responds to lightning overvoltage, its impedance mutates to a low value, allowing the lightning current to pass through. Devices used for such devices include: discharge gaps, gas discharge tubes, thyristors, etc. (2) Pressure limiting type: Its working principle is that when there is no instantaneous overvoltage, it is high-impedance, but with the increase of surge current and voltage, its impedance will continue to decrease, and its current and voltage characteristics are strongly nonlinear. Devices used for such devices include: zinc oxide, varistors, suppression diodes, avalanche diodes, and the like. (3) Shunt type or turbulent type Shunt type: In parallel with the protected device, it exhibits low impedance for lightning pulses and high impedance for normal operating frequency. Turbulence: In series with a protected device, it exhibits a high impedance for lightning pulses and a low impedance for normal operating frequencies. Devices used for such devices include: choke coils, high-pass filters, low-pass filters, quarter-wave short-circuiters, and the like. Summary: The above is the content of the parameters of the surge protector introduced by Xiaobian. Hopefully, it can help you effectively. For more information, please pay attention to this website. Heating Installation Renovation Installation Hydroelectric Installation Renovation Method Construction Installation The LED emergency driver for panel can be customized from 3W-100W with half power emergency output for emergency lighting 60-300mins. Automatic lighting up when main power failures. Suitable for LED fitting with external led driver. With internal or external lithium battery back up. Widely using for office, building, warehouse, school, hospital, workshop etc. Emergency Led Driver,Emergency Backup Driver for led,Emergency Light Driver,Emergency Driver For Panel,led light emergency power supply Foshan Nai An Lighting Electric Co.,ltd , https://www.naipslighting.com
