【Daily Topic】【Electrical Edition 20160731】

1. Remove dirt from the surface of the insulator, and check for any defects such as damage or cracks； Tiejin adheres firmly only to porcelain components, with acceptable insulation resistance. 2. The conductive contact surface is flat with no oxide film, and the current-carrying part has no severe dents or rust. If there are slight signs of burning, they can be repaired by grinding with fine sandpaper, followed by cleaning with gasoline; then apply a thin layer of industrial vaseline ； Components that are severely damaged and cannot be repaired should be replaced. 3. The contact between the knife switch and the static contacts is tight; when checked with a 0.005 mm feeler gauge, the longitudinal insertion depth should not exceed 5 mm, and the pressure from the springs on both sides should be even, in compliance with the specifications of the original product. 4. After the isolation switch and operating mechanism have been inspected and adjusted successfully, a test operation should be carried out. When the mechanical handle reaches the upper end position, the isolating switch must reach its closed position ； When the handle reaches the bottom, the isolating switch must reach its open position. After disconnection, the distance between the contacts of the same pole and the knife switch meets the product specifications. No jamming or other abnormal conditions that could hinder movement are allowed during operation. 5. The terminal connections should be in good condition and properly connected to the busbars; mechanical stress should not be applied to the isolating switch. 6. All parts that need to be tightened on the isolating switch and operating mechanism should be tightened. The operation of the auxiliary switch within the operating mechanism should be correct and reliable. 7. After maintenance, the following tests should be conducted: 1) Insulation resistance ； 2) Minimum operating voltage of the electric operating mechanism coil ； 3) The operation status of the operating mechanism, the contact condition of the contacts, and the spring pressure.

Isolating switches should be maintained in the following manner: 1. Remove dirt from the surface of the insulators, and at the same time check for any defects such as damage or cracks； Tiejin adheres firmly only to porcelain components, with acceptable insulation resistance. 2. The conductive contact surface is flat with no oxide film, and the current-carrying part has no severe dents or rust. If there are slight signs of burning, they can be repaired by grinding with fine sandpaper, followed by cleaning with gasoline; then apply a thin layer of industrial vaseline ； Components that are severely damaged and cannot be repaired should be replaced. 3. The contact between the knife switch and the static contacts is tight; when checked with a 0.005 mm feeler gauge, the longitudinal insertion depth should not exceed 5 mm, and the pressure from the springs on both sides should be even, in compliance with the specifications of the original product. 4. After the isolation switch and operating mechanism have been inspected and adjusted successfully, a test operation should be carried out. When the mechanical handle reaches the upper end position, the isolating switch must reach its closed position ； When the handle reaches the bottom, the isolating switch must reach its open position. After disconnection, the distance between the contacts of the same pole and the knife switch meets the product specifications. No jamming or other abnormal conditions that could hinder movement are allowed during operation. 5. The terminal connections should be in good condition and properly connected to the busbars; mechanical stress should not be applied to the isolating switch. 6. All parts that need to be tightened on the isolating switch and operating mechanism should be tightened. The operation of the auxiliary switch within the operating mechanism should be correct and reliable. 7. After maintenance, the following tests should be conducted: 1) Insulation resistance ； 2) Minimum operating voltage of the electric operating mechanism coil ； 3) Operation status of the operating mechanism, contact condition of the contacts, and spring pressure

(1) Check whether the insulators of the isolating switch are intact and for any signs of discharge. (2) Inspect the transmission components and mechanical parts. (3) Check the lubrication of moving parts. (4) Check whether the contacts are in good condition and free of dirt on their surface. (5) Check whether the attachments are complete and in good condition, including spring plates, copper strands, etc.

(1) Check whether the insulators of the disconnect switch are intact； Are there any corona or discharge phenomena? ； (2) Check the drive rods and various mechanical components for any abnormalities such as damage, rust, looseness, or detachment ； Regularly check the lubrication of all moving joints, and clean and lubricate them as necessary ； (3) Check whether the arc extinguishing angle is damaged, deformed, rusted, or tilted, and whether the contacts are in good contact. When the contacts are not in good contact, a large current flows through the arc-suppression corners, causing heating at those points; in severe cases, they may weld together, preventing the isolating switch from being opened ； (4) Check the contact surface of the contacts for any dirt or signs of burning, and examine the spring plates and copper strands for any broken strands or fractures. After long-term use, the elasticity of the contact spring may decrease; therefore, regular inspections and maintenance are necessary to adjust its compression amount.

(1) Check whether the insulators of the isolating switch are intact and for any signs of discharge. (2) Inspect the transmission components and mechanical parts. (3) Check the lubrication of moving parts. (4) Check whether the contacts are in good condition and free of dirt on their surface. (5) Check whether the attachments are complete and in good condition, including spring plates, copper strands, etc.

(1) Check whether the insulators of the disconnect switch are intact； Are there any corona or discharge phenomena? ； 　　(2) Check the drive rods and various mechanical components for any abnormalities such as damage, rust, looseness, or detachment ； Regularly check the lubrication of all moving joints, and clean and lubricate them as necessary ； 　　(3) Check whether the arc extinguishing angle is damaged, deformed, rusted, or tilted, and whether the contacts are in good contact. When the contacts are not in good contact, a large current flows through the arc-suppression corners, causing heating at those points; in severe cases, they may weld together, preventing the isolating switch from being opened ； 　　(4) Check the contact surface of the contacts for any dirt or signs of burning, and examine the spring plates and copper strands for any broken strands or fractures. After long-term use, the elasticity of the contact spring may decrease; therefore, regular inspections and maintenance are necessary to adjust its compression amount.

(1) Check whether the insulators of the disconnect switch are intact； Are there any corona or discharge phenomena? ； 　　(2) Check the drive rods and various mechanical components for any abnormalities such as damage, rust, looseness, or detachment ； Regularly check the lubrication of all moving joints, and clean and lubricate them as necessary ； 　　(3) Check whether the arc extinguishing angle is damaged, deformed, rusted, or tilted, and whether the contacts are in good contact. When the contacts are not in good contact, a large current flows through the arc-suppression corners, causing heating at those points; in severe cases, they may weld together, preventing the isolating switch from being opened ； 　　(4) Check the contact surface of the contacts for any dirt or signs of burning, and examine the spring plates and copper strands for any broken strands or fractures. After long-term use, the elasticity of the contact spring may decrease; therefore, regular inspections and maintenance are necessary to adjust its compression amount.

(1) Check whether the insulators of the disconnect switch are intact； Are there any corona or discharge phenomena? ； 　　(2) Check the drive rods and various mechanical components for any abnormalities such as damage, rust, looseness, or detachment ； Regularly check the lubrication of all moving joints, and clean and lubricate them as necessary ； 　　(3) Check whether the arc extinguishing angle is damaged, deformed, rusted, or tilted, and whether the contacts are in good contact. When the contacts are not in good contact, a large current flows through the arc-suppression corners, causing heating at those points; in severe cases, they may weld together, preventing the isolating switch from being opened ； 　　(4) Check the contact surface of the contacts for any dirt or signs of burning, and examine the spring plates and copper strands for any broken strands or fractures. After long-term use, the elasticity of the contact spring may decrease; therefore, regular inspections and maintenance are necessary to adjust its compression amount.

:1. Remove dirt from the surface of the insulators, and at the same time check for any defects such as damage or cracks; the metal parts should be firmly bonded to the ceramic components, and the insulation resistance should be within acceptable limits. 2. The conductive contact surface is flat with no oxide film, and the current-carrying part has no severe depressions or rust.

(1) Check whether the insulators of the disconnect switch are intact； Are there any corona or discharge phenomena? ； (2) Check the drive rods and various mechanical components for any abnormalities such as damage, rust, looseness, or detachment ； Regularly check the lubrication of all moving joints, and clean and lubricate them as necessary ； (3) Check whether the arc extinguishing angle is damaged, deformed, rusted, or tilted, and whether the contacts are in good contact. When the contacts are not in good contact, a large current flows through the arc-suppression corners, causing heating at those points; in severe cases, they may weld together, preventing the isolating switch from being opened ； (4) Check the contact surface of the contacts for any dirt or signs of burning, and examine the spring plates and copper strands for any broken strands or fractures. After long-term use, the elasticity of the contact spring may decrease; therefore, regular inspections and maintenance are necessary to adjust its compression amount.