Storing the lightning impulse test system is a task that requires extreme caution and a professional approach. This equipment is valuable, has a precise structure, and contains high-voltage hazardous components. Improper storage can lead to equipment damage, performance degradation, and even safety accidents.
1. Pre-Storage Preparation (The Most Critical Step)
Before moving the equipment to the storage area, a thorough inspection and pre-treatment must be conducted.
1)Complete Discharge:
Absolutely forbidden to store with any charge! This is the most important safety rule.
Use a dedicated discharge rod to perform multiple, thorough, and reliable discharges on all capacitors, electrodes, and high-voltage components. After discharging, use a multimeter to confirm that the voltage at key points is zero.
Ensure the main charging power supply and trigger power supply are completely disconnected and locked out (Lockout/Tagout).
2)Cleaning and Inspection:
Carefully clean dust, dirt, and salt deposits from the equipment casing, insulators, electrodes, and structural parts using dry compressed air, a soft brush, or anhydrous alcohol. Dirt absorbs moisture and reduces insulation strength.
Check all components for signs of damage, such as cracks, flashover traces, rust, etc., and take photos for record-keeping.
3)Key Component Handling:
Capacitors: For oil-impregnated pulse capacitors, the ideal storage condition is with oil. If oil must be drained, it must be done by professionals, followed by immediate vacuum drying and sealing of the capacitor to prevent moisture and oxidation. Electrolytic capacitors may require "conditioning" (gradual voltage application for activation) after long-term storage before use.
Wavefront/Wavetail Resistors: Check resistor plates/wires for overheating or damage. These components are usually robust, but their support structures need attention.
Spark Gaps: Clean electrode surfaces. Apply vaseline or special anti-rust grease if necessary to prevent oxidation. Ensure the adjustment mechanism moves freely.
Insulation Components (Transformer oil, insulators, nylon rods, etc.):
Transformer Oil: Sample the oil for withstand voltage tests and chromatography analysis to ensure quality. Filter or replace the oil if its quality has deteriorated.
Insulators (Porcelain, fiberglass, etc.): Clean and wrap them with moisture-proof materials (e.g., plastic sheeting) to prevent surface condensation.
Control and Measurement System: It is best to store precision electronic equipment like control cabinets, dividers, and oscilloscopes separately from the main generator in a more controlled indoor environment.
4)Documentation:
Record the current status of the equipment, the discharge and cleaning operations performed, any problems found, and the last test data (if possible) in detail. Photograph the equipment from various angles and the status of key components.
2. Storage Environment Requirements
The environment is crucial for determining whether the equipment remains intact and usable after storage.
1)Indoor Warehouse Preferred: Must be stored indoors. Outdoor storage is strictly prohibited.
2)Environmental Climate Control:
Temperature and Humidity: The environment should be temperature and humidity controlled. Ideal temperature: 10°C - 30°C; Ideal relative humidity: < 60%. Dehumidifiers, air conditioners, or humidity control systems are essential. High temperature and humidity can cause insulation moisture absorption, metal part corrosion, and component aging.
Cleanliness: The environment should be dust-free, free of corrosive gases, and free of chemical pollutants (e.g., acids, alkalis, salt spray). Keep away from dusty areas.
3)Physical Space Requirements:
Flooring: Level, solid, and moisture-proof (e.g., raised wooden planks or plastic pallets). Anti-static flooring is recommended.
Space: Leave sufficient space around the equipment (recommended at least 1 meter) for ventilation and future inspections. Do not place it flush against walls.
Protection: Implement rodent and insect prevention measures, as they can chew through cable insulation.