The biggest fear of a computer room is a fire, which can cause significant damage to the room. And many computer room fires are caused by UPS fires.
UPS is the equipment in the computer room that is most prone to catching fire. In the daily maintenance of the computer room, it is important to pay attention to the maintenance of UPS. Why is UPS power prone to catching fire?
1. Medium to high power UPS is a valve regulated sealed lead-acid battery, commonly known as a maintenance free battery. People generally believe that this type of battery does not require maintenance.
Many people think that this type of battery does not require maintenance. After installing the battery, they have never maintained it again and do not have regular dust removal maintenance. Excessive accumulation of dust can affect heat dissipation, and UPS batteries are greatly affected by the surrounding working environment, such as high temperatures and humidity.Excessive temperature can cause deformation of the battery casing, leakage of electrolyte, insufficient capacity, uneven voltage at the battery terminals, and can easily trigger fires.
2. The electrolyte leakage of the UPS power supply battery leads to imbalance between individual cells, resulting in breakdown during charging and discharging, leading to a fire.
There are many electronic devices in the computer room, and high temperatures and dry air can generate a lot of static electricity. UPS batteries are most prone to catching fire due to long-term deformation of the casing caused by high temperatures, electrolyte leakage, and static electricity.
The capacity of the entire battery pack is based on the capacity value of the worst condition battery, rather than the average or rated value (initial value). When the actual capacity of the battery drops below 90% of its rated capacity, the battery enters a decline period. When the battery capacity drops below 80% of its original capacity, the battery enters a rapid decline period, which is very short. At this time, the battery pack has a great potential for accidents and is prone to breakdown during charging and discharging.
3. The malfunction of the battery gas regulating valve leads to the occurrence of a fire.
The failure of the gas regulating valve in the battery can lead to a fire. If the gas regulating valve in the valve regulated sealed lead-acid battery fails, the gas generated during the internal charging process of the battery (usually above 2.30 V/cell when charged to a certain voltage) will release oxygen on the positive electrode of the battery and hydrogen on the negative electrode, which cannot be discharged in time. When the internal pressure of the battery exceeds the pressure that the ABS plastic shell can withstand, it will cause the ABS plastic cover of the battery shell to bulge, break or explode, leading to a fire.
4. Corrosion of the internal terminals, connecting pieces of the same polarity, and electrode joints of the battery can cause a short circuit of the electrode plates and result in a fire.
The corrosion of the electrode joints inside the UPS battery and the short circuit of the electrode plates are all due to the accumulation of too much dust on the UPS battery. The dust itself contains various unknown substances, which can cause corrosion and shortening of the joints of electronic devices.
During the charging and discharging of the battery pack, the temperature at the contact point rises sharply, causing short circuits in the terminals (connecting pieces) and melting of the shell, leading to the occurrence of fires.
5.UPS batteries have strict requirements for the working environment, such as temperature, humidity, etc. Changes in environmental factors can also cause battery failures and lead to fires.
Experiments have shown that for every 1℃ increase in the working temperature of UPS batteries beyond 25 ℃, their lifespan decreases by 50%. So, it is very important to promptly remove dust from UPS batteries and maintain good heat dissipation!