The Main Technical Parameters of The Surge Arrester

(1) Nominal voltage Un

This value corresponds to the rated voltage of the system to be protected,and in information technology systems this parameter corresponds to the type ofprotector chosen, indicating AC or DC voltage. For example, in a single-phasepower supply, it is generally marked as 230V/50Hz.

(2) Rated voltage Uc (maximum continuous operating voltage)

This value indicates the maximum continuous operating voltage of theprotector. That is, it can be applied to the specified end of the protector fora long time without causing changes in the characteristics of the protector andactivating the maximum voltage effective value of the protection element. Forexample, 385V AC, 500V DC.

(3) Rated discharge current In

It refers to the maximum impact current peak that the protector canwithstand when the standard 8/20μs lightning wave continuous impact is appliedto the protector for a specified number of times. Such as 20kA, 40kA, and soon.

(4) Maximum discharge current Imax

It refers to the maximum peak impact current that the protector canwithstand when the standard lightning wave shock of the above 8/20μs pulsewidth is applied to the protector once. For example, if the Isn=40kA of theZYSPD40K385B surge arrester, Imax=60kA.

(5) Voltage protection level Up

It refers to the maximum voltage at both ends of the lightning arrester inthe following test, where there are two test contents: residual voltage valueat rated discharge current, such as the residual voltage value of the lightningarrester <1.6kV when ZYSPD20K3853/4. The voltage value at both ends of thelightning arrester when the 1kV/µs shock wave is applied, such as the voltageprotection level of the ZYSPD-T-RJ11/2 lightning arrester <260V.

(6) Response time tA

This value is reflected in the operating sensitivity and breakdown time ofspecial components in the protector, which changes in a certain time dependingon the slope of dμ/dt or di/dt, and the response time of the lightningprotector is within 10 ~ 100ns.

(7) Data transmission rate Vs

Indicates how many bits (bps) of information are transmitted in a second,and is the reference value for the correct selection of the lightning arresterin the data transmission system. The data transmission rate of the lightningprotection device depends on the transmission mode of the system. For example,the network information protection line protector ZYSPD-N-series is suitablefor overvoltage protection of network information and data transmission lineequipment, and this type of lightning protection device is suitable for lineswith a transmission rate of 500kbps ~ 100Mbps.

(8) Insertion loss AE

It mainly refers to the signal line protector, which means the voltageratio before and after the protector is inserted at a given frequency. Forexample, the insertion loss of the ZYSPD-C-series protector for high-frequencyantenna feeders is < 0.5 dB.

(9) Return loss AR

It mainly refers to the protector used for high-frequency antenna feeders.Refers to the proportion of the front wave of the transmitted signal reflectedback in the protection device (reflection point), which is a direct measure ofthe matching performance of the protection device with the system impedance.For example, the protector ZYSPD-C-series for high-frequency antenna feedershas a return loss of ≥20 dB.