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IEC 61400-1 Vhub vs. Vref

IEC 61400-1 Vhub vs. Vref

IEC 61400-1 Vhub vs. Vref

(OP)
In section IEC 61400-1, on p. 45 Table 1 specifies Vref (10 min. avg, at hub height) for wind turbines, based on class. Later throughout chapter 6, the speed Vhub is used. How are these two speeds related? I cannot seem to find a definition of Vhub (only that it is velocity at hub height).

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