How can critical loads be protected?
Critical consumer loads are usually protected with a back-up source of power, commonly referred to as Un-interruptible Power Supply (UPS) systems. There are three UPS system types: static, interactive standby, and rotary. Static UPS systems are composed of a rectifier, batteries and an inverter. Interactive standby UPS systems differ from static UPS design in that a ferroresonant transformer is added to the inverter output. The ferroresonant transformer acts as a “magnetic flywheel” to store energy for up to four milliseconds A rotary UPS system is similar to the interactive UPS system except that the ferroresonant transformer is replaced with an AC motor and an AC generator. 5.6) What is the purpose of emergency systems and how do they differ from standby systems? Top Emergency systems are intended to supply electric power for essential life safety requirements. This includes some levels of lighting, fire detection, elevators, fire pumps, and communication. Standby systems are defined
