EN IEC 60034-3:2020 pdf download – ROTATING ELECTRICAL MACHINES – Part 3: Specific requirements for synchronous generators driven by steam turbines or combustion gas turbines and for synchronous compensators

03-05-2022 comment

EN IEC 60034-3:2020 pdf download – ROTATING ELECTRICAL MACHINES – Part 3: Specific requirements for synchronous generators driven by steam turbines or combustion gas turbines and for synchronous compensators.
3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60034-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 grid public electrical network or local (e.g. industrial) network, which is connected to the generator or compensator either directly or through a transformer 3.2 synchronous generator large synchronous machine driven by steam or gas turbines which converts mechanical energy into electrical energy and supplies it to an electrical grid Note 1 to entry: Generators can also provide reactive power to the grid. The driving unit itself or additional equipment is used to start up the generating unit. 3.3 synchronous compensator large synchronous machine electrically coupled to the grid but not exchanging mechanical energy through the shaft during steady state operation Note 1 to entry: Reactive power is supplied to the grid or imported to the compensator by means of adjusting the field current. Note 2 to entry: The losses are covered by the grid. A compensator needs a start-up device, which accelerates the unit to operating speed or can be started asynchronously if design is appropriate. Note 3 to entry: Synchronous compensators are commonly named synchronous condensers.
4.2 Rated conditions 4.2.1 Generators The rated conditions of a generator are given by the rated values of: • the apparent power; • frequency; • voltage; • power factor; • primary coolant temperature (40°C unless otherwise agreed upon); • field current and field voltage (see also 4.2.2); and where applicable: • site altitude; • hydrogen pressure with indication whether the figure is to be interpreted as absolute or gauge pressure; • range of hydrogen purity, see IEC 60034-1 . 4.2.2 Compensators The rated conditions of a compensator are basically the same as those of a generator but with different definitions of apparent power and power factor. • The rated apparent power consists mainly of the maximum continuous reactive output at rated voltage when the machine is overexcited, and of a small amount of active power delivered to the compensator. • The rated power factor is close to zero, reflecting mainly the maximum reactive power and the losses compensated by the grid. For compensators, the range of reactive power shall be agreed upon. NOTE During operation, the field current of a generator or compensator is adjusted depending on the demand of reactive power. Generator/compensator rated field current and field voltage are those values needed to operate the generator/compensator at rated conditions. Generator/compensator modelling studies can require base values for field current and field voltage other than rated.
4.3 Rated voltage The rated voltage shall be agreed upon. 4.4 Power factor The power factor of a generator shall be agreed upon. Standardised rated power factors at the generator terminals are 0,8, 0,85 and 0,9 overexcited. It is recommended that the generator be capable of providing a power factor of 0,95 underexcited at rated active power output. NOTE The lower the rated power factor the larger the generator will be. The rated power factor should reflect the demand on reactive power overexcited at rated active power output including some margin. The power factor of a synchronous compensator deviates from zero only by an amount, which depends on the losses compensated by the grid.
4.5 Rated speed Synchronous generators or compensators are typically connected to a grid with a fundamental operating frequency of 50 Hz or 60 Hz. The rated speed is: 3 000/p min –1 for 50 Hz generators or compensators; 3 600/p min –1 for 60 Hz generators or compensators; where p is the number of pole pairs. 4.6 Ranges of voltage and frequency Synchronous generators and compensators shall be capable of continuous rated output at the rated power factor over the ranges of ±5 % in voltage and ±2 % in frequency, as defined by the shaded area of Figure 1 . The temperature rise limits in Tables 8 and 9 of IEC 60034-1 :201 7, or the temperature limits in Table 1 3 of IEC 60034-1 :201 7 shall apply at the rated voltage and frequency. Continuous operation at rated output at certain parts of the boundary of the shaded area may cause additional temperature rise of up to approximately 1 0 K.

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