(1) To ensure the reliable and safe operation of the fuse cutout, in addition to strictly selecting qualified products and accessories (including fuse links, etc.) from reputable manufacturers in accordance with regulations, special attention should be paid to the following points during operation and maintenance management:
① Verify that the fuse unit's rated current is properly matched with the fuse link and load current values; adjustments must be made if the coordination is improper.
② Perform every fuse operation with care and precision; avoid carelessness, especially during closing operations, ensuring solid contact between the moving and stationary contacts.
③ Use only standard fuse links within the fuse tube; substituting fuse links with copper or aluminum wire is prohibited, as is tying the contacts together with copper, aluminum, or iron wire.
④ Strictly inspect newly installed or replaced fuses to ensure compliance with quality standards and regulations, specifically verifying that the fuse tube is installed at a downward angle of approximately 25°.
⑤ Replace a blown fuse link with a new one of the same specifications; do not reconnect a blown fuse link for continued use.
⑥ Conduct regular inspections of the fuses, including at least one nighttime inspection per month, to check for discharge sparks or poor contact (discharge is often accompanied by a hissing sound); arrange for prompt remediation if such issues are found.
(2) During spring maintenance outages, inspect the fuses for the following:
① Check the fit and integrity of the stationary and moving contacts, and look for signs of burning.
② Check the flexibility of rotating parts; look for abnormalities such as rust or stiffness, and inspect components for damage or spring corrosion.
③ Inspect the fuse link itself for damage, or for loosening and loss of tension due to elongation caused by prolonged current flow.
④ Inspect the arc-extinguishing tube (inside the fuse tube) for burn damage from repeated operations, and check for deformation or shortening caused by exposure to the elements.
⑤ Clean the insulators and inspect for damage, cracks, or discharge marks; after disconnecting the upper and lower leads, use a 2500V megohmmeter to verify that the insulation resistance exceeds 300 MΩ.
⑥ Check the upper and lower connecting leads for looseness, signs of discharge, or overheating. Defects identified during the inspection of the aforementioned items must be thoroughly repaired and addressed.