Weak Current Lighting in Switchgear In the KYN28A-12 switchgear

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the weak current lighting system plays an important role. The following is a detailed introduction about it:

### System Overview - **Function**: It provides necessary lighting inside the switchgear, facilitating operation personnel to clearly observe the status of various components within the switchgear during equipment operation, maintenance and overhaul processes, such as the position of circuit breakers, the on-off status of disconnectors, the readings of instruments and the condition of connection parts, etc., ensuring the accuracy and safety of operations.

- **Power Supply**: Usually, AC 220V or DC 220V, 110V, etc. are used as power sources. They are converted into safe voltages, generally weak current power supplies like 24V or 36V, through step-down transformers or switching power supplies to power the lighting fixtures.

### Selection and Arrangement of Lighting Fixtures

- **Fixture Types**: LED fixtures are mostly chosen, which have the advantages of high luminous efficiency, long service life, low power consumption and strong shock resistance. The shells of the lighting fixtures are usually made of materials that are fireproof, explosion-proof, dustproof and moisture-proof to adapt to the special environment inside the switchgear.

- **Arrangement Method**: The lighting fixtures are generally installed on the top or side of the switchgear. Through reasonable arrangement, it is ensured that each area inside the cabinet can obtain uniform lighting. In different compartments such as the circuit breaker compartment, busbar compartment, cable compartment and relay and instrument compartment, corresponding numbers of lighting fixtures will be installed according to actual needs.

### Control Methods - **Local Control**: A lighting control switch is set on the panel of the switchgear, allowing operation personnel to conveniently turn on or off the lighting as needed. This control method is simple and straightforward, facilitating the quick provision of lighting during on-site operations.

- **Remote Control**: By connecting with the monitoring system of the substation, remote control of the weak current lighting inside the switchgear is achieved. Operation personnel can control the lighting of each switchgear at the monitoring background, which is convenient for remotely providing lighting during equipment inspections or emergency handling.

### Maintenance and Precautions

- **Regular Maintenance**: The working status of the lighting fixtures should be checked regularly, including the brightness of bulbs and the sealing performance of the fixtures. If a bulb is found to be damaged or the brightness is insufficient, the bulb should be replaced in a timely manner. If the sealing performance of the fixture is poor, the sealing strips should be checked or the fixture shell should be replaced to prevent dust and moisture from entering the inside of the fixture and affecting its performance.

- **Safety Precautions**: When maintaining the lighting system, the lighting power supply must be cut off first, and corresponding safety measures should be taken, such as hanging a sign saying "Do Not Switch On, Men at Work". Meanwhile, maintenance personnel should use tools that meet safety requirements to avoid electric shock or other safety accidents caused by misoperation.