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There are many types of power distribution cabinets (units), For example: capacitor cabinet, switch cabinet, resistor cabinet, data cabinet, ring network cabinet, exchange cabinet.
There are generally various types of distribution cabinets in the power transformation and distribution room and uninterruptible power supply (UPS) room.
The distribution cabinet mainly includes: air switch, circuit breaker, various types of gate valves, terminal blocks, protection equipment (thermal relay, time relay, fuse, and advanced protection devices etc), measuring equipment (voltmeter, ammeter, frequency meter, power meter), as well as transformers and various sensors. After working for a long time, these devices may experience some line aging. when the load power is too high, heat will be generated and accumulate to a certain extent, which can cause a fire.
Power distribution cabinets are generally operated under long-term unmanned conditions. In the event of a fire, the absence of automatic fire extinguishing devices can easily cause huge losses and communication failures, resulting in significant economic losses and social impacts.
What do people usually do if a fire occurs in the distribution cabinet? Usually people will consider choosing the following fire extinguishing agents and their systems:
1. Water system, water system is the most traditional fire extinguishing system, For example, portable water-based fire extinguishers, water spray systems and high-pressure water mist systems, The problem is that water-based fire extinguishers have a relatively large tank body, and other water systems also come with pipe networks and various accessories, which cannot be installed in distribution cabinets with limited capacity.
So it is basically concluded that water-based fire extinguishing systems cannot function on distribution cabinets.
2. Foam system, Foam fire extinguishing systems, such as foam water guns and foam bladder tanks, are also very large in size and hardly be placed in the distribution cabinet.
3. Gas suppression system, the usual gas fire extinguishing systems nowadays include: FM200, Carbon dioxide, Inert gas, NOVEC 1230 systems, they all come with large-sized steel cylinders, cabinets and various pipe networks, so it can not be used in distribution cabinet also.
Moreover, they are all gases with pressure, which poses a great risk to the distribution cabinet.
4. Dry chemical powder system, Although the dry powder system has a small hanging type, the smallest size cannot be placed in the distribution cabinet, So the dry powder system is not an ideal choice.
So what system is more suitable for distribution cabinet fire protection? The answer is the aerosol fire extinguishing system, and it must be a small aerosol to be installed in a narrow distribution cabinet space.
Aerosol is a very magical fire extinguishing device because its agent is usually solid and becomes gaseous when activated for spraying, The advantage of this fire extinguishing system is that in solid conditions, the agent is highly concentrated, and after spraying, a large number of gaseous particles are generated, resulting in very high fire extinguishing efficiency.
Aerosols can be installed in various distribution cabinets, mainly based on the following points:
Small aerosol fire extinguishing systems have been successfully installed in various distribution cabinets for these telecommunications companies.
The power distribution system, transmission system, and substation system are huge systems, and distribution cabinets are used in all aspects. It is necessary to install fire extinguishing systems for distribution cabinets, and aerosols are the most ideal choice.