Fluorescent L Electronic Ballast 3
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Disclaimer: This photo is sourced from many relied on internet sites, photo copyright depends on the proprietor of the photo, we do not acknowledge this picture as our residential property or work.21.6.3 Automotive Lighting Electronic ballasts are used in automotive applications such as automobiles, buses, trains, and aircrafts. Normally, a lowvoltage dc bus is available to supply the lamps. A typical application is the use of compact fluorescent lamps with the electronic ballast inside the lamp base, which can directly substitute an incandescent lamp reducing the energy consumption four or five times. A selfoscillating halfbridge inverter is typically used in these energy saving Electronic ballasts can cut losses in half a second time, to 2 W, and at the same time increase the efficiency of the fluorescent tube itself, improve the quality of the light generated, reduce sensitivity to voltage and frequency fluctuations, and—for. In Brazil, the combination of high efficiency lamps, ballasts, and fixtures was found to raise the useful light output of a fluorescent lamp system by a factor of three (see table 39).58 Better controls, such as occupancy sensors or photocell Total harmonic distortion (THD) and third harmonic distortion also relate to a building's electrical power distribution system. The lower a ballast THD, the better. TheTHD should not exceed 0.20, and third harmonic distortion should not exceed 0.10. Electronic ballasts are available to dim fluorescent lamps. Dimming, however, remains a somewhat elusive feat. Cost, lamp life, lamp seasoning, and system reliability are unresolved issues. Further, dimming ballasts are not available for.all Figure 7.26 Serious damage to fluorescent lamp cathodes occurs an electronic instant start ballast is not connected correctly. When instant start electronic Note that achievable life will be considerably longer than that shown for Regime Life 165 min ON 15 min OFF >16,000 Hours Instant start 3min ON 3 min OFF 5,000 starts Preheat start 3 min ON 3 min >100,000 OFF starts Table 7.2 Life rating for representative T5 linear fluorescent lamps. (Actualfigures achieved depend on These ballasts have not been known to cause any problems with the electrical distribution where they are installed, further suggesting that the choice of a 20% limit on THD may be arbitrarily conservative. In any case, most electronic ballast manufacturers.now make electronic ballasts that are well under the 20% limit. ANSI Harmonic Standards for Electronic Ballasts The Fluorescent Lamp and Ballast Committees of ANSI are proposing updated harmonics standards for electronic HID lamp life is based on 10 hours/start and 50% mortality. At 120 hours/start HID lamp life is longer— many pulse start lamps are rated for up to 30000 hours. At 120 hour cycles Hubbell claims standard 400W. MH lamps will last 40000 hours and have 90% lumen maintenance when operated by their Howard/Hubbell ElectroReg 2.0 ballasts. • Fluorescent lamp life is based on 3 hours/start. At 12 hour cycles fluorescent lamp life is extended 2030%. At constant operation lamp life is ANSI Harmonic Standards.for Electronic Ballasts The Fluorescent Lamp and Ballast Committees of ANSI are proposing updated harmonics standards for electronic ballasts. These will be consensus standards that Third Harmonics of Current Electronic Ballasts Figure 6 lists test results for the third harmonics (potentially disruptive 180 Hz currents that add upon the threephase neutral) of several electronic ballasts now on the market. There are electronic ballasts that have third The lighting load takes about 320 kW (39.5%) of the total load. The existing lighting system with magnetic ballast and standard tube has been retrofitted with the following steps: 1 . Install the reflector. 2. Change the magnetic ballast with electronic ballast. 3. Replace the standard.tube with high output fluorescent lamp. 4. Reduce from 3 or 2 tubes per fitting to 1 tube per fitting. The following sections will explain each of the steps. A. Silverlux Reflector All the light fittings, either 2 or 3 tubes GE Lighting 1975 Noble Rd., Nela Park Cleveland, OH 44112 Tollfree: 8002551200 Phone: 2162662121 www.gelighting.com GE Lighting manufactures a full line of CFLs, with and without integral ballasts. Dimmable integralballast CFLs are available. The GE Genura lamp is marketed as a compact fluorescent lamp, but is really an induction lamp. The 23watt Genura offers longer life than standard CFLs (15,000 hours) in an R30 reflector style. The lamp is designed for indoor As shown in Figures 2 and 3, the electronic.ballast shipments increased steadily through the decade of the 90's and now outsell the high power factor magnetic ballast by a ratio of nearly 3:1 from a unit perspective and 4:1 from a market value standpoint. During this period of rapid (U.S. Census Bureau "Fluorescent Lamp Ballast: 2002 Summary" MQ335C(02)5, May 2003) Note: 2001 and 2002 HPF magnetic data estimated based on trends from available data from 19972000.
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