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Hydroelectric Power Plants Electrical Design


Quiz Questions

1.The development of a plant electrical one-line diagram should be one of the first tasks in the preliminary design of the plant.
True
False
2. The manual presents good engineering practice in designing electrical systems for hydroelectric power plants employing generating units of up to approximately 300 MW in rating.
True
False
3.A unit scheme showing outdoor switching of the generator and transformer bank as a unit on the high-voltage side only this is shown in Figure2-1a. The unit scheme is well-suited to small power systems where loss of large blocks of generation is difficult to tolerate.
True
False
4.Figure3-1 represents ________________.
Typical hydro-generator capability curve
Typical thermal- generator capability curve
None
5.The surge protection equipment does not consists of special surge arresters for protection against transient overvoltage and lightning surges, and special capacitors for limiting the rate of rise of surge voltages in addition to limiting their magnitude.
True
False
6.Surge arresters should be of the station type (preferably a metal oxide type) that provides the greatest protective margins to generating station equipment.
True
False
7.Transformers or transformer banks over ______ kVA should be protected with high-speed percentage-type differential relays.
1500
1000
500
8.Communications media available for power plant application would not include metallic cable pairs, leased telephone lines, power line carrier (PLC), radio frequency communications, including two-way land mobile (TWLM) radio and terrestrial microwave (MW), fiber optics and satellite communications.
True
False
9.The direct current system consists of a storage battery with its associated eliminator-type chargers, providing the stored energy system required to ensure adequate and uninterruptible power for critical power plant equipment.
True
False
10.The minimum size of conductor for current-carrying capacity should be based on the National Electrical Code (NEC) requirements for 60 °C insulated wire.
True
False
11.Typical hydro-generator capability curve is illustrated in ____________.
Figure 3-1
Figure3-2
Figure2-1
12.Generator capacity is commonly expressed in ______________at a given rated power factor.
Kilovolt-amperes (kVA)
Kilowatt-amperes (kWA)
13.The flywheel effect (Wk²) of a machine is expressed as the weight of the rotating parts multiplied by the square of the radius of gyration.
True
False
14.The measure of stability used in turbine and governor calculations is called the flywheel constant and is derived as
Flywheel Constant = (Wk²) (r/min)²/ Hp
Flywheel Constant = (Wk²) (r/hr)²/ Hp
15.Small power plants are frequently unattended and remotely controlled from an offsite location using SCADA equipment. The SCADA and communication equipment should be located in the general control area.
True
False