When industrial and civil buildings are in a state of fire emergency, in order to ensure the success of fire fighting, the independent power supply that supplies power to fire-fighting electrical equipment is called emergency power. "Civil Building Electrical Design Code" clearly stipulates that the first load should be powered by two power sources. When one power source fails, the other power source should not be damaged; the power source form of the first load includes two high-voltage power sources and one high-voltage power source And one low-voltage power supply, diesel generator set or storage battery group; in addition to the above two power supplies, the emergency power supply must be added in addition to the above two power supplies.

Common types of emergency power
1. EPS emergency power supply: An emergency power supply that inverts DC electrical energy to AC electrical energy, consisting of chargers, inverters, batteries, isolation transformers, and switches. It is suitable for loads that allow power interruption for more than 0.25s.

2. UPS uninterruptible power supply: It is mainly a static AC uninterruptible power supply device consisting of a power converter energy storage device (battery) and a switch (electronic and mechanical) to ensure power supply continuity. It is suitable for the load that allows the power supply to be interrupted for milliseconds.

3. Self-contained emergency diesel generator set: It is a diesel-powered power generation equipment that is powered by a power-frequency AC synchronous generator. Fast self-starting generator set is suitable for buildings that allow power interruption for more than 15s. The working time of the emergency power supply should be considered according to the blackout time allowed in the production technology. When used in conjunction with the auto-starting generator set, it should not be less than 10min.

4. Dedicated feed line with automatic input device independent of normal power supply. It is suitable for the emergency power supply whose operating time can meet the allowable power interruption time of 1.5s or more than 0.6s. For any particularly important load with a millisecond level and small capacity, if it is possible to use a DC power supply, a battery pack should be used as an emergency power supply.

5. Self-contained emergency gas-turbine generator set; it is a power-generating equipment which is powered by a gas turbine and drags a power-frequency AC synchronous generator.

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