Low-voltage distribution cabinet control cabinet maintenance - Solutions - Huaqiang Electronic Network

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

1.5PF SOT23-6 Low Capacitance 5V Breakdown Voltage 6V SRV05

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

The primary goal of this maintenance process is to ensure the safe and efficient operation of low-voltage power distribution cabinets and control panels across different equipment. This procedure is specifically designed for use in low-voltage distribution rooms and control cabinets, following all applicable safety and operational standards. The responsibility for conducting this maintenance lies with the Mechanical and Electrical Installation and Maintenance Engineering Department. They are required to perform a full inspection and maintenance every six months, minimizing any power outages during the process. The key steps involved in the maintenance include: 1. **Preparation:** - Notify all tenants about the scheduled power outage the day before it occurs. - Ensure all tools and equipment are ready and complete, so that maintenance can be done as quickly as possible. 2. **Maintenance Procedures:** - Begin by working on the security load section first. - Disconnect the main switch for the security load, turn off the generator, and set the selector switch to "stop." Remove the battery connections and hang a warning sign to prevent accidental power transmission. - Inspect busbar joints for deformation or discoloration, and tighten bolts if necessary. Replace any rusted bolts to maintain secure connections. - Check the insulation of the busbars for looseness or damage. - Use a handle to remove dust from the power distribution cabinet, check for burnt contacts, damaged arc extinguishing covers, and clean internal components. - Take out the sub-switch cabinets and tighten the terminals. Verify the installation and wiring of current transformers, ammeters, and watt-hour meters. Check the reliability of the operating mechanism and clean the switches and wiring behind the cabinet. - When maintaining the capacitor cabinet, first disconnect the main switch, discharge each capacitor using wires of at least 10mm², and inspect the contactor, wiring, and grounding system. Clean the cabinet with a vacuum cleaner. - After completing the security load section, start the generator to provide power to the main section. - Gradually disconnect the low-voltage side circuit breaker, then the high-voltage side vacuum circuit breaker of the transformer. Close the grounding switch and hang a “No Switch, No Work” sign. - Once all checks are completed, remove the safety devices, open the grounding switch, close the vacuum circuit breaker, and monitor the transformer's operation. Then restore power to the low-voltage distribution cabinet and switch the security load back to main power. 3. **Safety Precautions:** - Always verify that the power is off before starting work. - Install isolation devices between live and non-live sections when working on the power distribution cabinet. - When operating high-voltage vacuum circuit breakers, wear insulated boots and gloves, and have a dedicated supervisor present. - Never touch capacitors before they are fully discharged to ground. - Before restoring power, double-check that no tools are left inside the cabinet. 4. **Documentation:** - Maintain records of inspection work tickets. - Keep annual maintenance logs for power distribution and control cabinets. - Document all equipment maintenance activities for future reference. By following these procedures, the integrity and reliability of the electrical systems are ensured, reducing the risk of failures and enhancing overall safety.