1) Selecting the Voltage Protection Level (UP) The UP value should not exceed the impulse withstand voltage rating of the protected equipment. The UP requirement requires good coordination between the
1. To select surge protective device, you first need to understand some parameters and their working principles. (1) Residual voltage Ur refers to the residual voltage value under the rated discharge
First, we need to understand some parameters and their working principles. ⑴ The 10/350μs wave simulates a direct lightning strike and has high waveform energy; the 8/20μs wave simulates lightning ind
Power Line SPD Because the energy of a lightning strike is extremely large, a tiered discharge method is required to gradually dissipate the lightning energy to the ground. In the non-direct lightning
Based on their operating principles, they can be classified as voltage switching, voltage limiting, and combination types. (1) Voltage switching surge protective device. They exhibit high impedance in
If the distance between the incoming line terminal's surge protective device and the protected equipment is greater than 30m, a second surge protector with a current capacity of 8kA should be installe
If the combined voltage of the incoming SPD's Up voltage plus the induced voltage across its leads, as well as the reflected wave effect, is too high compared to the impulse withstand voltage of the r
The voltage protection level Up of the surge protective device device should always be less than the impulse withstand voltage Uchoc of the protected equipment and greater than the maximum operating g
Voltage-limiting type surge protective device: Its operating principle is to provide high impedance when there is no transient overvoltage. However, as surge current and voltage increase, its impedanc
To protect the protected equipment from overvoltage, the voltage protection level Up of the surge protective device must always be less than the impulse withstand voltage Uchoc of the protected equipm
Impulse Current Iimp: Specified as including the amplitude current Ipeak and charge Q. Nominal Discharge Current In: The peak current flowing through the surge protective device, 8/20μs current wave.
The type and structure of surge protective device vary according to different uses, but surge protector should contain at least one nonlinear voltage limiting element. The basic components used for su
surge protective device are essential devices for lightning protection of electronic equipment. They were formerly known as lightning arresters or surge protectors (SPDs). Their function is to limit t
Switching Type surge protective device Its operating principle is that it exhibits high impedance when there is no transient overvoltage. However, in response to a lightning transient overvoltage, its
Surge protection devices (SPDs), often referred to as "lightning arresters" or "overvoltage protectors," are essential for lightning protection of electronic equipment. The function of an surge protec
With the rapid development of electronic technology and the widespread use of personal computers, large and medium-sized computers, and related information equipment, building protection against light
1. Detection Equipment and Operational Issues Equipment Errors and Calibration Deficiencies Prolonged use surge protective device or improper maintenance leads to performance degradation of detectio
Installation Method for surge protective device: A "V" connection is recommended. The residual voltage at both ends of surge protector is ULPE = U1 + Up. The shorter connecting wires significantly red
Spacing and Energy Matching Issues When installing a surge protective device (SPD), consider the energy matching between the two stages. Generally, when SPDs are installed at multiple locations on a l
At the junction of LPZ1 and LPZ2, at the distribution panel or before the UPS, a second-level surge protective device should be installed. Products that have passed T1 or T2 classification tests shoul
Installation Location According to IEC 131221 (LPZ) concepts, surge protective device should be installed when electrical lines cross the boundary between two lightning protection zones. Depending on
Residual voltage Ures of surge protective device This is the actual voltage applied to the terminals of the protected equipment. The lower the residual voltage, the better. It should be less than the
Protection Level Up This value should be greater than the maximum limiting voltage measured at the SPD terminals and consistent with the device's withstand voltage (Uw) (1.2U p ≤ Uw). It can be select
surge protective device (SPD) Maximum Continuous Operating Voltage Uc The maximum RMS voltage or DC voltage that may be continuously applied across the SPD is equal to the rated voltage of the SPD its
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