1. Nominal voltage Un: The device is normally withstand voltage, and the lightning arrester does not operate. Corresponding to the rated voltage of the protected system, this parameter indicates the type of protector that should be selected in the information technology system, which indicates the rms value of the AC or DC voltage.
2. The maximum continuous operating voltage Uc: can be permanently applied to the designated end of the protector without causing a change in the protector characteristic and activating the maximum voltage rms value of the protective element.
3. The nominal discharge current In: also called the rated discharge current Isn, the maximum inrush current peak that the protector is subjected to when the protector is applied with a standard lightning wave of 8/20 μs.
4. Maximum discharge current Imax: The maximum inrush current peak that the protector is tolerated when a standard lightning wave with a waveform of 8/20 μs is applied to the protector.
5. Voltage protection level Up: The maximum value of the protector in the following tests: the flashover voltage of 1KV/μs slope; the residual voltage at the nominal discharge current.
6. Response time Ta: The action sensitivity and breakdown time of the special protection component mainly reflecting in the protector, and the change in a certain time depends on the slope of du/dt or di/dt.
7. Data transmission rate Vs: indicates how many bit values ​​are transmitted in one second, the unit is: bps; it is the reference value of the lightning protection device correctly selected in the data transmission system, and the data transmission rate of the lightning protection device depends on the transmission mode of the system.
8. Insertion loss Ae: The ratio of the voltage before and after the protector is inserted at a given frequency.
9. Return Loss Ar: Indicates the ratio of the leading edge wave reflected by the protection device (reflection point), which is a parameter that directly measures whether the protection device is compatible with the system impedance.
10. Maximum longitudinal discharge current: refers to the peak value of the maximum inrush current that the protector is subjected to when the standard lightning wave with a waveform of 8/20μs is applied to each ground.
11. Maximum lateral discharge current: The maximum inrush current peak that the protector is subjected to when the standard lightning wave with a waveform of 8/20μs is applied between the line and the line.
12. Online impedance: refers to the sum of the loop resistance and the inductive reactance flowing through the protector under the nominal voltage Un. Often referred to as "system impedance."
13. Peak discharge current: There are two types: nominal discharge current In and maximum discharge current Imax.
14. Leakage current: refers to the DC current flowing through the protector at a nominal voltage Un of 75 or 80.
15. Free current If - follow current: The current flowing into the SPD from the power supply system after the impact current is discharged. The freewheeling is significantly different from the continuous operating current Ic.
16. Rated load current IL - rated load current: The maximum continuous rated AC current rms or DC current that can be supplied to the SPD-protected output.
17. Voltage protection level Up-voltage protection: level characterizes the performance parameters of the SPD limit terminal voltage. The value can be selected from the list of priority values. This value should be greater than the maximum value of the limit voltage
18. Limiting voltage: The maximum voltage peak measured between SPD terminals when a specified waveform and an assigned surge voltage are applied.
19. Residual voltage: The voltage peak between the terminals when the discharge current flows through the SPD.
20. Transient overvoltage (TOV) characteristic temporary overvoltage (TOV) characteristic: The working condition when the SPD is subjected to a transient overvoltage UT to a predetermined time tT.
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