The industrial automation workshop, as the core production and manufacturing scenario, integrates precise automation equipment such as PLC, frequency converters, sensors, as well as various power and control lines. The stability of its operation directly determines the continuity of production and safety. Lightning strikes, as high-frequency and sudden disasters, can damage automation equipment, interrupt production processes, and even cause secondary disasters such as fires and equipment damage, resulting in significant economic losses. This solution is based on industry standards such as GB 50057-2010 "Building Lightning Protection Design Code" and SH/T 3081-2019 "Petroleum and Chemical Instrument Grounding Design Code", combined with the structural characteristics of the workshop, equipment layout, and lightning protection pain points, to construct a comprehensive lightning protection system of "external protection against direct strikes, internal protection against induction, grounding protection against counterattacks, and operation and maintenance protection against failure", taking into account practicality, economy, and operability, to provide reliable protection for industrial automation equipment and workshop production safety.

I. Lightning protection measures for the workshop exterior. Factory workshops are mostly of steel structure or reinforced concrete structure. Some outdoor equipment (such as cooling towers and fans) are highly exposed and have a prominent risk of direct lightning strikes. The external protection mainly focuses on lightning arrest and current diversion. The workshop's steel structure roof is given priority as the lightning arrester (the thickness of color steel sheet should be ≥ 0.5mm and the galvanized layer should be intact). Heat-dip zinc-coated round steel lightning protection strips are laid at the non-metallic partition strips on the roof. The protection range is calculated using the ball impact method to ensure that the outdoor equipment and the highest points of the workshop are completely covered. The down conductors prioritize using the steel columns of the workshop as natural down conductors. For reinforced concrete workshops, the two main reinforcing bars within the columns are used as down conductors, with the spacing controlled according to the lightning protection category (Class 2 ≤ 24m). The down conductors are set at a height of 0.3 - 1.8m from the ground and equipped with disconnect clips for easy detection. The grounding system adopts a combination of ring-shaped horizontal grounding bodies and vertical grounding electrodes. The horizontal grounding bodies use 25×4mm heat-dip zinc-coated flat steel, with a burial depth of ≥ 0.8m. The vertical grounding electrodes use 50×50×5mm heat-dip zinc-coated angle steel (length ≥ 2.5m), with a spacing of 5 - 10m. The grounding resistance should be ≤ 4Ω. In areas with high soil resistivity, graphite grounding modules are added for optimization. 

II. Lightning protection measures within the workshop. The focus is on preventing induced lightning and ground potential surges, taking into account the precise and sensitive nature of the automated equipment. The power system follows the principle of graded protection. A level I SPD (10/350μs, Imax ≥ 50kA) is installed at the main distribution cabinet in the workshop, a level II SPD (8/20μs, In ≥ 40kA) is installed at the distribution cabinet, and level III fine protection SPDs are added at the terminals of precise equipment such as PLCs and frequency converters to prevent surge voltages from invading. In terms of signal line protection, special SPDs are installed at the entrances of weak electrical lines such as sensors and data cables. Cables are laid using metal trays and both ends are grounded. Strong and weak electrical lines are separately laid with a spacing of ≥ 0.5m to avoid cross-interference. Regarding equipotential connection, all metal equipment shells, cable trays, metal pipes, and cabinets in the workshop are connected to the main grounding busbar using ≥ 25mm² copper braided wire. In explosion-proof environments, intrinsically safe instruments are not grounded, while other instruments are grounded according to the specifications to eliminate potential differences and prevent ground potential surges. 

III. Special Protection for Automated Equipment. For the core equipment of industrial automation, targeted protective measures are taken. The control rooms of PLC and DCS systems adopt Faraday cage shielding structures to reduce the interference from lightning electromagnetic pulses; for the equipment such as frequency converters and servo drives in the workshop, special surge protectors are installed at the power input terminals, and the output ends are shielded to prevent damage caused by lightning strikes and the interruption of the entire automated production line. For sensors and actuators installed outdoors, in addition to installing special SPDs, waterproof and lightning-proof enclosures are used for packaging, and the leads are shortened to within 1.5 meters to reduce the impact of induced lightning. The instrument system strictly follows the specifications. The metal shells of instruments in special areas such as the tank area are reliably electrically connected to the tank body, and the wiring uses metal conduit shielding and is grounded at both ends. 

IV. Operation Management and Emergency Response. Establish a regular operation management mechanism to ensure the long-term effectiveness of the lightning protection system. Class I lightning protection workshops should be inspected once every six months, while Class II workshops should be inspected once a year. Key inspections include checking for rust on lightning arresters, the reliability of down conductors' connections, the performance of SPDs, and the grounding resistance. Damaged components should be replaced promptly. Establish a lightning protection operation ledger to record installation, inspection, and maintenance details, enabling full-process traceability. Strengthen emergency response during thunderstorm seasons, formulate lightning strike fault emergency plans, clearly define equipment inspection and fault handling procedures, and quickly identify and restore equipment damage after a lightning strike, ensuring production can be resumed promptly. Regularly conduct standardized training for operation personnel to enhance their capabilities in lightning protection detection and emergency response. 

This solution strictly adheres to industry standards, specifically addressing the pain points of industrial automation and lightning protection in factory workshops. It simplifies redundant construction, takes into account both protection effectiveness and economic efficiency, and can be directly implemented. Through comprehensive lightning protection measures, it effectively intercepts direct lightning strikes, suppresses induced lightning, and eliminates counterattack risks, significantly reducing the risks of equipment failures and production disruptions caused by lightning strikes. It truly ensures the safe and stable operation of industrial automation production lines, and helps enterprises achieve safe production.