I. Management Regulations
According to the GDW 168-2008 "Transmission and Transformer State Inspection and Maintenance Test Regulations," the isolating switch should undergo power-off cleaning as part of routine maintenance, which is typically conducted every three years. This ensures that the equipment remains in good condition and reduces the risk of failure due to dirt or contamination.
II. Function of the Isolating Switch
The 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, the circuit breaker must first be turned off to ensure no current is present. When closing, the isolating switch should be closed first, followed by the circuit breaker. Its primary functions include isolating the power supply during maintenance, changing the operating mode of the equipment, and handling low-current circuits for switching operations.
III. Cleaning Standards
(1) The outer surface of the insulating porcelain sleeve should be free from dirt accumulation, with no cracks on the flange and a secure bond between the porcelain and the base.
(2) The contact surfaces must be clean, without mechanical damage, oxidation, overheating signs, or deformation.
(3) The mechanism box should be thoroughly cleaned, ensuring no areas are missed, and all components remain in good working order.
IV. Cleaning Procedure
Preparation
(1) Confirm that the isolating switch to be cleaned is fully de-energized and that all necessary safety measures are in place.
(2) Gather all required tools and materials: one insulated ladder, one safety harness, five rags, two insulating brushes (1.5-inch and 2-inch sizes), one roll of insulating tape, and one vacuum cleaner.
Cleaning Steps
(1) Cleaning the Porcelain Sleeve:
1) Conduct a visual inspection of the entire isolating switch to check for any visible damage or issues.
2) Use an insulated climbing device and a brush or cloth to carefully wipe the porcelain sleeve, ensuring all surfaces are clean and free from debris.
(2) Cleaning the Terminal Box:
1) Inspect 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 from the bottom of the terminal box.
V. Safety Precautions
(1) Ensure all tools used are appropriate and safe, and avoid using any that could become conductive if exposed to moisture.
(2) Use only insulated small brushes for cleaning, and make sure your sleeves are securely fastened. Avoid wearing any metal accessories during the process.
(3) Perform the cleaning gently, avoiding excessive force. After cleaning, double-check all components to ensure they are properly maintained and functioning as expected.
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