AN ARRANGEMENT AND A METHOD FOR COOLING

摘要

An arrangement for cooling a high voltage converter comprises a major loop (9) with pumping means (10) for making a coolant liquid to pass power semiconductor devices of the converter and a heat exchanger (1 1 ) for lowering the temperature of the coolant liquid before passing the power semiconductor devices again. An extra loop (12) is connected to said major loop. This extra loop has a cooling apparatus (13) containing a volume of a cooling medium and adapted to cool this medium to a temperature being substantially lower than the temperature of the coolant liquid after having passed the heat exchanger in the major loop. A control unit (17) is adapted to divert at least a part of said coolant liquid to flow through said extra loop (12) when the need of cooling said power semiconductor devices of the converter is extremely high.