The 10/350µs surge protective device (SPD) is a high-level electrical surge protection equipment specifically designed to
defend against direct lightning strikes and high-energy lightning surges. It excels in lightning current withstand
capability, response speed, and protection efficiency, making it
particularly suitable for primary protection in high lightning risk
environments such as industrial plants, communication base stations,
and main power distribution systems. Below is a systematic interpretation of the core advantages and typical applications of this type of surge
protective device:
(1) Waveform Definition
The 10/350µs waveform is a standardized simulation of lightning impulse
current: 10µs represents the wavefront time, i.e., the time required for the current to rise from zero to its peak; 350µs represents the time to
half-value, i.e., the time taken for the current to decay from its peak to 50%. This waveform simulates high-energy impacts caused by direct lightning strikes.
(2) Practical Significance
Compared to the 8/20µs waveform, which simulates induced lightning, the
10/350µs waveform carries higher energy and is more destructive. It is
typically used in scenarios requiring defense against direct lightning
strikes, such as main distribution cabinets of buildings, large
industrial equipment, and transformer inlets.
(1) High Energy Withstand Capability
Capable of withstanding extremely high lightning strike currents (Iimp), making it suitable for direct lightning environments. Typical Iimp values include 12.5kA, with high-end products reaching up to 50kA, ensuring reliable system operation
even under extreme lightning conditions.
(2) Low Residual Voltage Protection (Up)
Can limit overvoltage to within the withstand range of equipment, with
common residual voltages below 2.5kV. Especially suitable for protecting industrial and power equipment, effectively resisting high-voltage impacts.
(3) Nanosecond-Level Rapid Response
Response time is typically within 100 nanoseconds, enabling rapid suppression of transient surges and minimizing impact on equipment lifespan and system operation.
(4) Long-Term Multiple Protection Performance
Utilizes high-quality components such as metal oxide varistors (MOVs) and gas
discharge tubes (GDTs), ensuring protective functionality is maintained
even after multiple lightning strikes. Its long service life makes it
suitable for lightning-prone areas.
(5) Comprehensive Multi-Line Protection
Supports multi-pole structures, covering various wiring methods in
three-phase power systems, such as L-L, L-N, and L-PE, achieving systematic protection.
Main Distribution Cabinets of Buildings: Serves as the first level of protection at the grid entrance, blocking the intrusion of
direct lightning currents.
Industrial Plants: Used to protect production lines, heavy
machinery, transformers, and other critical equipment.
Communication Base Stations: Installed at power supply entrances
to ensure communication facilities are unaffected by lightning
damage.
Photovoltaic Power Systems: Provides surge protection for DC
voltage types, covering inverters, energy storage batteries, and
other equipment.
Data Centers: Acts as the first lightning protection barrier at the main power inlet, ensuring the stable operation of high-value equipment such as servers.
Discharge Capacity (Iimp): ≥12.5kA is recommended for ordinary
areas, while ≥50kA should be selected for high lightning risk
areas.
Voltage Protection Level (Up): ≤1.2kV is recommended for precision equipment, while ≤1.5kV can be chosen for industrial environments.
Continuous Operating Voltage (Uc): Must match the system, such as
320V for single-phase systems and 385V for three-phase systems.
Standards and Certifications: Prioritize products compliant with
IEC 61643-11 and possessing CE and ROHS certifications.
This brand offers various Iimp specifications (e.g., 12.5kA, 25kA) of
10/350µs surge protective devices. Featuring a modular design for easy
maintenance, smart monitoring, and fault alarm functions, these devices
comply with international standards and offer high cost-effectiveness, making them widely suitable for industrial and
commercial power protection scenarios.
Should be installed near the main power distribution inlet, with
grounding resistance ≤10Ω and grounding wires kept short and
straight.
In high-risk areas, a multi-level SPD protection system (T1, T2, T3) should be combined for
coordinated protection.
Regular inspection of device status via indicators or remote
signals is necessary. Performance testing is recommended after
the thunderstorm season.
With its excellent ability to withstand and suppress high-energy lightning strikes, the 10/350µs surge protective device is a
critical component in direct lightning protection. Proper selection and
installation, such as choosing reputable brands like Nanjing Kaitai, can build a reliable safety barrier for power systems.
Ensure power safety by choosing high-performance 10/350µs surge protective devices!