Many people understand a lightning protection system as a relatively independent system: air termination system, down conductors, earthing devices, equipotential bonding, SPDs, lightning protection testing and lightning strike records. This understanding is not wrong, but it only sees the lightning protection system itself, without seeing the relationship between the lightning protection system and the electrical system it protects.
In real field conditions, lightning strikes and surges never stop at the lightning protection devices. A single external impulse may trip or degrade an SPD, change the grounding status, or cause communication equipment to drop offline, power modules to fail, control systems to restart, sensors to issue false alarms, or even leave behind hidden hazards such as subsequent insulation degradation or unstable equipment operation.
Therefore, smart lightning protection must not only answer whether a lightning strike occurred, whether the SPD was disconnected and whether the grounding resistance is compliant. It must go further and answer: Did this lightning strike affect the electrical system? Did it cause equipment abnormality? Does it leave hidden hazards behind? Does it need to enter the electrical safety early warning chain?
1. Lightning protection risk is essentially part of electrical safety risk
The objects a lightning protection system protects are not the lightning protection devices themselves, but the power supply system, communication system, control system, sensing system and business equipment behind them. The goal of lightning protection is not to make lightning protection equipment "look normal", but to keep the protected electrical system stable and safe over the long term.
Lightning current and surges ultimately affect power supply continuity, insulation safety, equipment reliability, communication stability, control system operation and electrical fire risk. If lightning strike events are treated only as internal events of the lightning protection system, their impact on overall electrical safety can easily be underestimated.
For example, if a site shows communication abnormality after a thunderstorm, looking only at the communication equipment itself may lead to a diagnosis of network fault; but if the lightning current event, SPD status changes and grounding mutation are also visible, the diagnosis gets much closer to the real risk chain.
2. What early warning data does smart lightning protection provide?
Smart lightning protection can provide five categories of important data for electrical safety early warning. The first category is lightning current event data, including occurrence time, location, peak value, polarity, rise time, duration, energy and multiple strike records. It answers what kind of external impulse the system experienced.
The second category is SPD status data, including disconnection, leakage current changes, temperature changes, degradation trends, service life status and operation count. It answers whether the protective device is still reliable. The third category is grounding status data, including grounding resistance changes, rising trends, mutation after lightning strikes, unstable connections and regional differences. It answers whether the discharge path is still reliable.
The fourth category is surge-to-equipment alarm correlation data, such as equipment dropping offline after a thunderstorm, communication alarms, power supply abnormality, equipment restarts and control system faults. The fifth category is work order and review data, including whether a work order was dispatched, whether review was performed, whether replacement was made, whether recovery was confirmed and whether the issue recurred. Together they answer whether the risk was actually addressed.
3. Why should these data enter the electrical safety early warning system?
Lightning strikes and surges may trigger other electrical hidden hazards. After a surge impulse, equipment insulation may degrade; after SPD degradation, protection capability declines; after abnormal grounding, the discharge paths for fault current and lightning current worsen; after communication abnormality, the platform may lose its ability to sense field status.
Lightning protection data can also explain many sudden equipment faults. If a piece of equipment becomes abnormal after a thunderstorm period, lightning protection data can help determine whether a lightning strike or surge impulse occurred, whether the SPD operated, whether grounding was abnormal, and whether there is a time correlation between equipment alarms and lightning strike events.
More importantly, lightning protection data improves early warning accuracy. Looking at equipment alarms alone may not reveal the cause of the abnormality; if lightning current, SPD, grounding, voltage, current, temperature and other data are combined, the risk chain can be identified more accurately, reducing false alarms and missed alarms.
4. How should the electrical safety early warning system incorporate smart lightning protection?
The electrical safety early warning system can incorporate smart lightning protection into a five-layer architecture: the sensing layer, event layer, status layer, diagnosis layer and handling layer.
The sensing layer collects lightning current, SPD status, grounding status, voltage, current, leakage current, temperature, arc fault, harmonics and equipment online status. The event layer identifies lightning strike events, surge events, SPD operation events, grounding mutation events and equipment alarm events.
The status layer determines whether the SPD is degraded, grounding is stable, power supply is fluctuating, leakage current is rising, temperature is abnormal and arc fault risk is increasing. The diagnosis layer performs multi-indicator correlation, timeline comparison, risk level assessment, cause explanation and trend identification. The handling layer ultimately produces alarm grading, work order dispatch, field review, recovery confirmation and event archiving.
5. Multi-source data fusion is the real early warning
After smart lightning protection enters the electrical safety early warning system, the platform no longer only checks whether a certain lightning protection device is normal; instead, it analyzes lightning protection data together with voltage, current, leakage current, temperature, arc fault, harmonics and equipment alarms in the same risk chain.
For example, after a lightning current event, SPD leakage current rises, the grounding status mutates at the same time, and some communication device reports an offline alarm. In this case, the platform should not treat the four phenomena as four isolated alarms, but should identify them as a protection chain response and equipment status change triggered by a single external impulse.
This multi-source data fusion is exactly the key step from "seeing an abnormality" to "explaining the abnormality".
6. Which scenarios need this fusion most?
Wind farms are a typical scenario. Turbine lightning strikes are frequent, and lightning protection data should be linked with blades, nacelle, tower, box transformer, grounding and communication systems. Photovoltaic and energy storage plants also need similar capabilities, because DC-side lines are long and inverters and storage equipment are high-value; surge events may affect PCS, BMS, communication and monitoring systems.
In oil and petrochemical and hazardous chemical scenarios, lightning protection, static protection, grounding and electrical safety are closely related, and risk review after a thunderstorm must have an evidence chain. Communication base stations are widely distributed and unattended; after a lightning strike, the status of power, communication, grounding and SPDs must be judged remotely.
Data centers and industrial parks have high requirements for continuous operation. Lightning strike and surge events should be linked with UPS, power distribution cabinets, low-voltage systems and monitoring systems to truly serve electrical safety management.
7. How does FEXLINK understand this?
FEXLINK believes that smart lightning protection is not an isolated "online-ization of lightning protection devices", but an important risk sensing module in the electrical safety early warning system.
FEXLINK focuses not on the status of a single device, but on the complete data chain from electrical signal capture, data feature extraction, multi-dimensional risk diagnosis, alarm grading and work order closure to long-term risk profiling.
When smart lightning protection data enters the electrical safety early warning system, the platform no longer only answers whether lightning protection equipment is normal, but goes further to answer: Is the electrical system being affected by external impulses? Is the protection chain still effective? Is risk accumulating? Does proactive handling need to be taken?
Conclusion: The next step for smart lightning protection is to enter the foundation of electrical safety risk
The value of smart lightning protection is not just making the lightning protection system visible, but bringing lightning strikes, surges, SPDs, grounding and equipment alarms into a unified electrical safety risk judgment system. Lightning protection systems are not islands, lightning strike events are not isolated events, SPD degradation is not an isolated status, and grounding abnormality is not an isolated indicator.
Only by combining these data with voltage, current, leakage current, temperature, arc fault, harmonics, equipment alarms and work order handling can a truly field-oriented electrical safety early warning system be built.
