The IEC permits the use of the decibel with field quantities as well as power and this recommendation is followed by many national standards bodies, such as NIST, which justifies the use of the decibel for voltage ratios.
12.
The \ sqrt { \ frac { Z _ { I2 } } { Z _ { I1 } } } term represents the voltage ratio that would be observed if the maximum available power was transferred from the source to the load.
13.
In the constant voltage ratio ( or " open voltage " ) method, the current from the photovoltaic array must be set to zero momentarily to measure the open circuit voltage and then afterwards set to a predetermined percentage of the measured voltage, usually around 76 %.
14.
Because it requires both fewer windings and a smaller core, an autotransformer for power applications is typically lighter and less costly than a two-winding transformer, up to a voltage ratio of about 3 : 1; beyond that range, a two-winding transformer is usually more economical.
15.
Examples are a voltage regulator ( which can be a transformer whose voltage ratio of transformation can be adjusted, or an electronic circuit that produces a defined voltage ), a pressure regulator, such as a diving regulator, which maintains its output at a fixed pressure lower than its input, and a fuel regulator ( which controls the supply of fuel ).
16.
The design output of Francis turbines is 41, 171 kW each, the turbine speed is 428.6 r . p . m ., the generator rating is 46 MVA, and generation voltage is 10.5 kV . An outdoor switch yard is provided next to the surface powerhouse with main two step up transformers of 50 MVA rating and voltage ratio is 10.5 / 240 kV . The powerhouse is operated both under the remote control mode from the south regional dispatching control and automatically under the local control mode.
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