PNNL 13277

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PNNL 13277 ( pnnl-13277 )

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Instrumentation—Legibility recommendation for scales and metering accuracy requirements (±2% for ac electrical instruments and ±10% for engine instruments/indicators). Current Rating—Current carrying capacity requirements for conductors and components (should be sufficient for service). Identification of Components—General good human factors design requirements for component identification Electrical Protection-Requirement for short-circuit protection and recommendations for other related practices, including some that belong in 7.5. 4.2.6 Complete Generator Set Terms and Expressions—Defines quantities measured by representative voltage strip chart (8.1.1) and frequency strip chart (8.1.2). No requirements, just definitions. Unit Starting and Load Acceptance—Contains three requirements: 1) emergency (must be started, on line and under load in 10 seconds or less); 2) standby (must be started, on line and under load in 1 minute or less); and 3) additional starting aids (use of aids; e.g., engine coolant and battery temperature control, glow plugs and/or oil heating) under severe conditions. Rated Power—The generator set must be capable of producing its rated power at rated frequency, voltage, and electrical power factor, corrected to standard ambient conditions per SAE J1349. Governor Performance for Application Classifications—Contains definitions and quantitative requirements relating to frequency regulation. Voltage Regulation—Subsection 8.2.4.1 requires steady state VR no more than 2% between no load and full rated load (per EGSA 100R). It also defines requirements for random voltage variation and voltage sensitivity to temperature. Subsection 8.2.4.2 provides advice on the tailoring of self regulated alternator voltage. Excitation Support System (Optional)—Defines 2.5 per unit exciter current requirement when applicable. Unbalanced Loads—Recommends keeping unbalance to less than 20%; connecting no more than 1/3 of nominal kVA rating to any one phase of a 3-phase system and requirements for delta, delta-delta or open delta connections together with voltage unbalance limits. Waveform and Telephone Influence Factor—Defines maximum allowable harmonic content and telephone influence factors for application classifications listed in Section 3.3. 4.4

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