When a box-type substation is flooded during heavy rainfall, proper emergency handling is essential to ensure safety.
First Step: Immediately disconnect the power supply to prevent short circuits and explosions, and assign personnel to guard the site after power is cut off. Note: Never disconnect power by hand. Use insulated rods or dry wooden tools while wearing insulating gloves to avoid electric arc injuries and electric shock accidents caused by distribution equipment.
Second Step: Organize personnel to remove accumulated water as quickly as possible. Note: Anyone entering the equipment area must wear insulating gloves and insulating footwear. Use insulated tools for power isolation and promptly report the incident to management or the responsible equipment supervisor. During emergency operations, special attention should be paid to personal safety. Strictly control site access, do not open equipment doors without authorization, post warning signs, establish safety barriers, and implement all necessary safety precautions.
    Third Step: After water has been drained from the box-type substation or distribution room, do not rush to restore operation. Thoroughly dry the main power switch, ensure adequate ventilation and dehumidification, and inspect all affected equipment, cables, transformers, and other components that may have been submerged.
    Fourth Step: Arrange for qualified electrical technicians to inspect all flooded power equipment on site. Insulation tests should be performed on high-voltage switchgear, low-voltage distribution cabinets, transformers, cables, and other electrical equipment. Power may only be restored after confirming that there are no short circuits, faults, or hidden safety hazards.
    Fifth Step: If water has entered high-voltage switchgear or low-voltage distribution cabinets, use heated dry air to thoroughly dry switches, wiring, and other electrical components. After drying, conduct detailed testing on each switch and component to verify that no damage has occurred before restoring operation.
Important: Never restore a box-type substation to service if there is any possibility of an internal short circuit. Forced energization may not only damage the equipment but also jeopardize the safe operation of the upstream power grid. Therefore, all five steps must be followed carefully, and power should only be restored after all inspections and tests have been successfully completed.