4-20ma Signal Lightning Arrester Lightning Protection Measures

2.1 9kv lightning arrester installation of signal lines
Installation location: The signal lighting arrester 11kv should be installed at the key point between the signal source and the control device, as close as possible to the signal input end of the protected device. This can absorb the surge energy in the first time when lightning occurs, and prevent the voltage from being transmitted to the equipment.
Ground wire access: Ensure that lighting arrester 33kv is well grounded. The shorter the ground wire, the better, reducing impedance. lightning arrester 20 kvThrough grounding, the surge energy is directed into the ground to prevent the surge from entering the equipment.
2.2 Multi-level protection
Graded protection design: Combined with a multi-level lightning protection system, a first-level power lightning arrester 22kv (Type 1) is installed at the main power inlet, and a second-level lightning arrester 24kv (Type 2) or a third-level lightning arrester 24kv 10ka (Type 3) is installed near the equipment. The signal lightning arrester serves as a fine-level protection to prevent small voltage fluctuations from damaging delicate sensor equipment.
2.3 Regular inspection and maintenance
Check the grounding system: Before the thunderstorm season, regularly check the grounding system to ensure that the grounding resistance is less than 10 ohms. Poor grounding will cause the lightning arrester to fail and fail to release surge energy in time.
Status monitoring: High-quality signal arresters are usually equipped with status indication functions to regularly monitor the working status of the arrester to avoid failure of the arrester when lightning strikes frequently.
2.4 Installation shielding and grounding
Cable shielding: Use shielded cables and connect them to the grounding point to prevent inductive lightning or static electricity from entering the control system through the cable.
Signal isolation: Use an isolation transmitter to isolate the sensor signal from the system to further enhance the protection effect.
2.5 Reasonable wiring
Signal line and power line separation: Ensure that the signal line is laid separately from the high-voltage power line to avoid inductive surges or interference.
Short-distance wiring: Try to shorten the length of the signal transmission line to reduce the impact of lightning induction.