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A battery-powered standby supply is able to supply DC power from rechargeable batteries during a power outage It is installed so that it parallels the normal utility 120-V AC line It is essentially an AC-to-DC rectifier and charger that draws power from the normal AC line to maintain a bank of rechargeable lead acid storage batteries, as shown in the block diagram Fig 11-1 A voltage sensor circuit senses the absence of AC input power following an outage and sends a signal to the bypass switch, which automatically opens the AC line and switches in the storage batteries to pick up the emergency load These supplies are relatively simple and highly reliable, but the emergency load must be capable of operating from DC power It will typically include emergency floodlights and audio or visual alarms to indicate the outage of normal power, but it can power lights or services capable of operation from either AC or DC sources This contrasts with an uninterruptible supply (UPS), which can deliver 120 V AC to sustain the operation of all critical AC-powered lights and services The standby supply will continue to function until its batteries discharge below the level required to sustain the load or normal power is restored When normal AC power
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EMERGENCY AND STANDBY SYSTEMS
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Block diagram of a battery-powered standby power supply
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is restored, the voltage sensor circuit switches the bypass switch back to the normal AC line so that it picks up the AC load again The transfer from normal AC power to batteries and back again is made without interruption The AC line then recharges the batteries in preparation for the next outage
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An uninterruptible power supply provides conditioned AC to the load when normal AC line power is available and raw AC power to the load, inverted from rechargeable storage batteries, when normal AC power is interrupted The UPS includes an AC-to-DC rectifier and a DC-to-AC inverter in series with a bypass switch, as shown in the block diagram Fig 11-2 The AC-to-DC rectifier converts the raw AC to DC and feeds it to the DC-to-AC inverter, which inverts it to the conditioned AC that normally powers the load through the bypass switch The AC-to-DC rectifier includes a charger that keeps the bank of rechargeable storage batteries at full charge When an outage of normal AC power occurs, the batteries take over and continue to supply DC to the DC-to-AC inverter to sustain the AC load until the batteries discharge below the level required to sustain the load or normal power is restored If a fault occurs within the UPS circuitry under normal conditions, a converter faultsensor circuit detects the malfunction and directs the bypass switch to open the inverter circuit and close the parallel bypass line, allowing normal AC to assume the load Repairs can then be made to the internal UPS circuitry The bypass switch can also be operated manually to permit routine maintenance of those internal UPS circuits Another kind of uninterruptible power supply based on the energy obtained from a spinning flywheel rather than from rechargeable batteries has been introduced Caterpillar, Inc, is now offering a line of uninterruptible power supplies that substitute stored flywheel energy for rechargeable batteries to provide constant power protection against sags, surges, or outages that can disrupt normal operations or cause a loss of valuable computer data Caterpillar claims that its units can make an uninterrupted
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EMERGENCY POWER FUNCTIONS
Figure 11-2
Block diagram of an uninterruptible power supply (UPS)
transition to a standby engine generator set, adding that by canceling harmonic distortions, their systems can work seamlessly with those generator sets to increase their total electrical load capacity Efficiency of 97 percent is claimed for the systems, and they occupy less floor space than comparably rated conventional UPS systems based on rechargeable batteries Caterpillar developed the flywheel systems to augment its line of engine generator sets According to the company, the combination provides improved protection against extended brownouts and blackouts, and because it has eliminated lead acid batteries, it is now the most reliable and trouble-free UPS system available
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