Handbook of Electrical Engineering

430 HANDBOOK OF ELECTRICAL ENGINEERING Table 15.6. Harmonic rms currents and voltages in a star-wound induction motor that is fe ...

HARMONIC VOLTAGES AND CURRENTS 431 which at the time of preparing this book was still in its original form. In addition the Refe ...

432 HANDBOOK OF ELECTRICAL ENGINEERING Table 15.8. Protection alarms and indications for a high-voltage variable speed drive Fun ...

HARMONIC VOLTAGES AND CURRENTS 433 can be taken into account reasonably easily. For example the specifications that are prepared ...

434 HANDBOOK OF ELECTRICAL ENGINEERING S. B. Dewan, G. R. Slemon and A. Straughen,Power semiconductor drives. John Wiley & ...

16 Computer Based Power Management Systems 16.1 Introduction Modern power systems that are self-sufficient with their own turbin ...

436 HANDBOOK OF ELECTRICAL ENGINEERING a SCADA sub-system, but its operation should be kept as independent from other general op ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 437 Table 16.1. Relay devices and switchgear mechanism delay times Device Circuit breake ...

438 HANDBOOK OF ELECTRICAL ENGINEERING because in practice generators seldom share power accurately, as measured and indicated, ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 439 Table 16.2. Critical load factor versus number of generators Critical pre-fault load ...

440 HANDBOOK OF ELECTRICAL ENGINEERING Table 16.3. Priority table for a power management system on an offshore oil and gas platf ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 441 Measurement of active power at the generator terminals. Measurement of gas-turbine ...

442 HANDBOOK OF ELECTRICAL ENGINEERING Equation (16.1) can be rearranged to determine the largest motor rating for a given volt- ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 443 White devices withdrawn from service. Yellow devices tripped due to a fault. Each ...

444 HANDBOOK OF ELECTRICAL ENGINEERING set point. Such a scheme can be easily incorporated into the PMS because all the measurem ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 445 Figure 16.2 Screen page of a power management visual display unit. The PMS can be pr ...

446 HANDBOOK OF ELECTRICAL ENGINEERING initially until the upper load factor is reached. At this point the PMS should give a mes ...

COMPUTER BASED POWER MANAGEMENT SYSTEMS 447 supply is lost for a short time, or even a long time, then these loads should be all ...

448 HANDBOOK OF ELECTRICAL ENGINEERING The PMS can use these signals to adjust the AVR set point to reduce the voltage magnitude ...

17 Uninterruptible Power Supplies 17.1 AC UNINTERRUPTIBLE POWER SUPPLIES 17.1.1 The Inverter Static inverters are used to conver ...