How much do you know about the daily maintenance of high and low voltage power distribution cabinet?

Complete electrical maintenance knowledge

First, low-voltage distribution cabinet

1. Check each cabinet regularly for traces of insect activity, and conduct regular trapping and killing.

2. Check whether the warning and maintenance plates are placed correctly.

3. Check whether the emergency tools and lamps are complete and normal, and whether the crank and fuse handles are complete.

4. Check whether the cable joint is hot and discolored (usually silver), and whether the ground wire is corroded (whether the welding point is normal).

5. Check whether the capacitor shell in the capacitor cabinet is good, whether there is leakage, expansion, and whether the indicator is good.

6. Check the contact of the ground cable of each capacitor shell.

Seven. Do a good job of cleaning and dust removal of each cabinet.

8. Check the working status of the fans in each cabinet.

This video is mainly lectured by teacher Qin, electrical engineer of Colorful Education

Second, first level maintenance

1. Check whether the bus bar and its lower lead are secure.

2. Check whether the secondary circuit wiring is firm, whether the fuse is intact and the insulation resistance is measured.

3. Capacitor cabinet inspection: When the air switch is disconnected without capacitance, the capacitor controller should be tested. The closed one should be broken first, and the closed one should be broken later. The overvoltage protection, undercurrent protection and cut-off threshold values should be adjusted.

4. Each indicator light should be intact, check and adjust the circuit breaker leakage switch, thermal relay, yes and no relay, multi-function meter, etc.

5. Check whether the indicator light is normal, whether the controller switch position is normal, the operation should be normal, and whether the manual debugging of the mechanical chain part is reliable.

6. Check whether the fasteners of each soft starter and frequency converter are not loose.

Third, secondary maintenance

1. Check whether the drawer switch is flexible in pushing or pulling out, its mechanical lock is reliable, and the contactor contact is good.

2. Check whether the knife edge elasticity of the circuit breaker is normal and whether the arc extinguishing device is intact.

3. Check whether the connection nuts of each cable end are secured.

4. After the main switch of the receiving cabinet and the contact cabinet is disconnected, the special crank should be shaken out or shaken out flexibly, the secondary terminal heads such as the transformer are in good contact and tight without loosening, and the primary and secondary lines are not mildewed.

Four, the daily maintenance of the line switch

1. Check the cleanliness of the equipment, using a clean dry cloth to wipe off any dust and oil stains, and if possible use a non-corrosive detergent.

2. Check whether the device nameplate is in good condition. Use a clean dry cloth to clean half of these nameplates.

3. Wipe off dust, mold, and oxides, as well as clean the inside of the stationary part of the draw-out circuit breaker. Ensure that there are no foreign objects in the circuit breaker room.

4. Use a clean, dry cloth to remove dust or dirt from the circuit breaker edges and bus bars.

5. Verify that the bolts used to connect the terminals are properly secured and that there is no sign of local overheating on the terminals. Heat can be identified by looking for changes in the color of the contact, which is usually silver-white.

Seven. Check whether the cables on the sliding contacts or terminal block are secure

How to maintain daily

1. Insulation should be done well

Usually, the temperature range required by the high and low voltage power distribution cabinet is between -10 ° C and 45 ° C. If the ambient temperature is too high, the conductivity of the metal parts will be lower, and the resistivity will be larger, and the oxidation will gradually accelerate, and the insulation strength of the insulated parts will be reduced. Of course, too cold environment will also make the equipment components produce large internal stress, thus destroying the reliability of the insulation parts. Therefore, according to the situation, it is necessary to increase some insulation electrical appliances, and insulation protection measures, and the surrounding environment requires no fire source, no pollution, and non-corrosive chemicals.

2. Prevent dust regularly

The metal equipment used on the high and low voltage switchgear daily in order to do a good job of rust and corrosion prevention, can be coated with the appropriate paint, in order to eliminate the impact of dust on insulation performance, should also be regularly used to clean the dust in the equipment, for the daily operation of the circuit breaker, to regularly check the loosening of the screws, do a good job of fastening work.

3. The internal wiring of the high and low voltage power distribution cabinet must be reasonable

Sometimes because of production needs, it is necessary to connect the temporary power supply from the switch cabinet for the use of high-voltage equipment, in strict accordance with the electrical safety management procedures when wiring, the use of good insulation performance of the wire, its safety should be able to fully meet the needs of the electrical load, so that electrical professionals operate, requiring the wiring to be smooth and not knotted, no entanglement between the line and the line. Do reliable grounding work. When the temporary power supply is not needed, it is necessary to remove the newly added power supply facilities and clean up the site in time.