Study on the cause of fire in Shanghai LED display screen

Morning 7:30 pm, Shanghai City, Ruijin Zhaojiabang road junction in the construction of a square suddenly caught fire, eastday received friends broke the news after rushed to the scene.

Reporter arrived at the scene learned that the fire point is located in Ruijin Zhaojiabang Road intersection in the construction of the "ASE center square". The fire is a giant LED screen in the middle of the square. According to witnesses, around 7:30 am today, this led screen above the smoke, followed by an open flame.

It is reported that after the occurrence of the fire, three fire engines have rushed to the scene, 20 minutes after the fire. The top of the huge LED screen was burned out of a hole about 2 square meters. At present, the cause of the fire is not clear.

Shanghai in the construction of a square LED display the fire cause of the fire is not clear, "shocking incident. This can not help but also sounded the alarm for us - LED display security, equally important, here to remind consumers not to sacrifice the safety of cheap.

Do not know that this is what led display manufacturers peer masterpiece, estimated after this, they should also learn from it, pay attention to safety in the future production and installation process.

We simply analyze the cause of the fire, about the following:

1 man-made fire:

Construction personnel in the installation screen, the use of fire or smoke on the screen behind the pilot still items. From the point of view of the extent of the damage to the scene, this situation should not lead to such serious consequences, because the display is generally not flammable.

2, welding operation is not standard:

Welding operation is not standardized, resulting in ignition of inflammables, is a possibility, but in the picture display installation to such a degree that has no need to use welding, because the steel structure and the decoration has been done, so this situation should be excluded.

, 3 power supply wiring problem:

Display so much from the photo, there should be at least 100 square meters, the power of at least 100KW, 380V power supply, so in the process of using, if the lines are wrong, it will happen, probably there are several:

Status: a three-phase power mix, such as A and B mixed together.

Status two: Zero fire mix, directly connected together.

Status three: power directly to the weak, the upcoming 220 AC 5V DC directly to the place of power supply;

Above three kinds of circumstances, will lead to fire, burning to fire that cable.

In addition, manufacturers in the choice of circuit breaker, current is too large, there is not the problem of short circuit tripping, so as not to be able to avoid further deterioration in the problems.

4, switching power supply problems.

Switching power supply before the output has self-locking protection function, namely in the output DC direct power supply circuit, direct protection, no output, only when you will rule out the power supply problem, broken intervals for a period of time after the power supply, power supply to normal output, from the play to the display screen protection effect.

And now in a strong price competition under the pressure of switching power supply manufacturers began to cut corners, some use the disassemble of manufactured products, or remove some of the proper protection circuit, the protection of "locking protection" function is to get rid of. This will be a condition when the DC output short circuit, switching power supply power supply will continue, although he will not burn, but because of the large current load and the cable has been in persistent fever and cause serious fire burned. But there's no power.

For the power supply, manufacturers do not accept their responsibilities, they only said "I will not burn the power, I don't care you".

In this case, only the existence of hidden dangers, if not connected with the short circuit, there will not be a problem, but the problem just came together, the problem appeared so.

After the above analysis, the accident is the biggest possible problem after two - switching power supply problems, wiring problems.

To the accident, we sounded the alarm, safety responsibility, weightier than Mount Tai;

For security issues, has always been a priority among priorities of our company. All employees into the company's first lesson, that is, security education. Let everyone to establish a sense of safety, in strict compliance with the safety operation specification, to avoid accidents.

In fact, if the display manufacturer, in the installation process, to strictly control the safety procedures, carefully check the wiring, and the multimeter is used to measure the pathway, can avoid the problem has occurred.