Uninterruptible power system

Lead-acid batteries are also used for emergency power in uninterruptible power systems (UPS), telecommunications back-up systems, and safety equipment in critical applications such as hospitals and nuclear power plants. Stationary or standby battery designs and recharge profiles vary according to the specific system requirements. Large battery strings are connected in series to deliver up to several hundred volts. [Pg.119]

Uninterruptible power systems have become a virtual necessity for powering large or small computer systems where the application serves a critical need. Computers and data communications systems are no more reliable than the power from which they operate. The difference between UPS and emergency standby power is that the UPS is always in operation. It reverts to an alternative power source, such as the utility company, only if the UPS fails or needs to be deactivated for maintenance. Even then, the transfer of power occurs so quickly (within miUiseconds) that it does not interrupt proper operation of the load. [Pg.1132]

FIGURE 10.139 Block diagram of an uninterruptible power system using AC rectification to float the battery supply. A closed loop inverter draws on this supply and delivers clean AC power to the protected load. [Pg.1134]

Figure 10.181 shows a simplified schematic diagram of a 220-kW uninterruptible power system (UPS) utilizing dual utility company feed lines, a 750-kVA gas engine generator, and five DC-driven... [Pg.1159]

An uninterruptible power system is an elegant solution to power outage concerns. The output of the UPS inverter may be a sine wave or pseudosine wave. The following design considerations are important ... [Pg.1170]

The basic uninterruptible power system is built around a battery-driven inverter, with the batteries recharged by the utility AC line. As shown in Fig. 10.197, AC from the utility feed is rectified and applied to recharge or float a bank of batteries. This DC power drives a single- or multiphase closed-loop inverter, which regulates output voltage and frequency. The output of the inverter is generally a sine wave. [Pg.1171]

Many facilities do not require the operation of all equipment during a power outage. Rather than use one large standbypower system, keypieces ofequipment can be protected with small, dedicated, uninterruptible power systems. Small UPS units are available with built-in battery supplies for computer systems and other... [Pg.1175]

Forward-transfer mode An operational state of an uninterruptible power system in which the load is normally powered by the utility Hne, and the inverter is idle. [Pg.1183]

Uninterruptible power system (UPS) A power processing device used to protect a sensitive load from disturbances on the utility AC Hne. A UPS system typically consists of a battery bank that drives an inverter to produce power for the load, line switching hardware, and supervisory control circuitry. [Pg.1184]

SSUPS solid-state uninterruptible power system... [Pg.2536]

Power Requirements. Connection to an emergency power source is requisite for all HPM gas analyzers. If the particular analyzer utilized must go through a boot-up process each time it is powered up, a UPS (uninterruptible power system) should be provided. [Pg.463]

Implants Lighting Medical appliances Memory back-up Meteorological equipment Meters, test equipment, and instrumentation Signals and alarms Telephones Tools Toys Watches, clocks Uninterruptible power systems ... [Pg.145]

Standby emergency power telephone exchange, uninterruptible power systems (UPS), load levehng, signaling... [Pg.588]

FIGURE 23.54 Schematic of continuous-type uninterruptible power system (UPS). [Pg.671]

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