I. Management Regulations
According to the GDW 168-2008 "Transmission and Transformer State Inspection and Maintenance Test Regulations," the power-off cleaning of isolating switches is conducted during routine inspections every three years. This ensures that the equipment remains in optimal condition, reducing the risk of failure and improving overall system reliability. Regular maintenance not only complies with industry standards but also extends the service life of the switchgear.
II. The Role of the Isolating Switch
An isolating switch is not designed for use under load conditions. It should never be operated when current is flowing through the circuit. Before opening the isolating switch, it is essential to first disconnect the circuit using a circuit breaker. When closing, the isolating switch must be closed first, followed by the circuit breaker. Its primary functions include isolating the power supply during maintenance, changing the operational mode of the equipment, and handling low-current circuits safely.
III. Cleaning Process Standards
(1) The outer surface of the insulating porcelain sleeve should be free from dirt accumulation, while the flange must show no cracks or signs of damage. The porcelain sleeve should be firmly bonded without any gaps or looseness.
(2) The contact surfaces must be clean, free from mechanical damage, oxidation, overheating marks, distortion, or deformation.
(3) The mechanism box should be thoroughly cleaned, ensuring no corners or areas are missed. All components inside must be free from dust and debris.
IV. Cleaning Procedure
Preparation Work
(1) Confirm that the isolating switch to be cleaned is fully de-energized and that all necessary safety precautions have been implemented, such as grounding and warning signs.
(2) Prepare all required tools and materials: one insulated ladder, one safety harness, five rags, two insulating brushes (1.5-inch and 2-inch), one roll of insulating tape, and one vacuum cleaner.
Cleaning Steps
(1) Porcelain Sleeve Cleaning:
1) Conduct a visual inspection of the isolating switch to ensure there is no visible damage or abnormality.
2) Clean the porcelain sleeve using an insulated brush or cloth, paying special attention to hard-to-reach areas. Inspect each section carefully after cleaning.
(2) Terminal Box Cleaning:
1) Check the terminal block for loose connections or damaged insulation.
2) Clean the terminal box starting from the top and moving downward, following the direction of the cable entry.
3) Use the vacuum cleaner to remove dust and debris from the bottom of the terminal box.
V. Cleaning Precautions
(1) Ensure all tools used are appropriate and safe. Avoid using tools that may become conductive if exposed to moisture.
(2) Use only insulated brushes for cleaning. Keep your sleeves tight and avoid wearing any metal accessories during the process.
(3) Perform the cleaning gently and avoid applying excessive force. After completing the cleaning, conduct a final inspection to ensure everything is in order and functioning properly.
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