Common faults and solutions of incandescent lamps in household lighting circuits

2021-04-23 09:11:23 lighting 3

Incandescent lamps, as highly reliable products, have survived to this day even if their brightness is far lower than that of fluorescent lamps and LED lamps. I have to admit that the failure rate of incandescent lamps is much lower than that of fluorescent lamps and LED lamps. The incandescent lamp relies on the thermal effect of current to light metal tungsten to perform lighting work. There is no rectifier or starter, so the fault judgment is relatively simple.

The faults and solutions of incandescent lamps are as follows-

There are only two possibilities for the incandescent lamp not to light up: 1. The incandescent lamp is broken; 2. The circuit is out of power.

When an incandescent lamp does not turn on, you must first check whether there is electricity in the circuit. It can be judged by observing other electrical appliances in the room and the status of the circuit breaker in the distribution box. On the premise of confirming that there is no power failure in the mains, if there is only an incandescent lamp circuit every day, it may be that the circuit is faulty. Of course this rarely happens.

If the circuit breaker trips, it is necessary to determine whether there is a short circuit in the circuit in time.

To judge whether the incandescent lamp is broken, you can judge by shaking the bulb. If the tungsten wire melts and breaks, there will be a sound of metal hitting the glass when shaking.

It is because of the characteristics of incandescent lamp heating tungsten filament that the incandescent lamp can directly reflect the current situation in the circuit. The possibility of causing the incandescent lamp to dim is as follows-

Tungsten wire virtual connection. It is possible that the tungsten filament in the incandescent lamp has been broken, but it is connected to the two ends of the conductor during the falling process, so a loop can still be formed. However, such a loop cannot pass current like a normal loop, and the incandescent lamp will become dimmed. It may even turn on and off.

Incandescent lamps are aging. Tungsten filaments that have been used for a long time will be liquefied by heat and evaporate. This is also the reason why the glass of the old incandescent lamp will turn black. The evaporated tungsten wire will become thinner, so the brightness will not be as good as before.

The power supply voltage is low. Often occurs in rural or remote areas. The power supply in these places is unstable, and it is common for the voltage to be less than 220V. The voltage drop will naturally reduce the current, which will cause insufficient heat generation, and the tungsten wire will not be able to light up completely.

The circuit load is high. If the incandescent lamp were in a single circuit, this would not happen. If it is in a loop with other electrical appliances, when other electrical appliances work, the voltage of the incandescent lamp branch will inevitably decrease.