A turbomachine arrangement comprising - a blade of a turbomachine; and - a platform cooling device for the blade configured to be positioned at a platform of the blade, the platform cooling device comprising: - a peripheral edge configured to be in contact with the platform; and - a first surface portion configured to form a first cavity between the platform cooling device and the platform, the first surface portion comprising a plurality of impingement holes configured to impinge onto the platform during operation of the turbomachine; and - a second surface portion configured to form a second cavity between the platform cooling device and the platform; and - a barrier configured to be in contact with the platform, the barrier forming a connection between two sections (15, 16) of the edge and separating the first cavity from the second cavity fluidically; characterized in that - the platform cooling device and the blade are separately manufactured components, and - the platform cooling device is connected at the edge to the blade, such that the first cavity and the second cavity are formed between the platform cooling device and the blade, and - the blade comprises a cooling fluid supply passage, connecting a hollow blade core and the second cavity, for supplying of cooling fluid to the second cavity during operation, and - the first cavity is supplied, during operation, with cooling fluid via the impingement holes of the first surface portion. - a blade of a turbomachine; and - a platform cooling device for the blade configured to be positioned at a platform of the blade, the platform cooling device comprising: - a peripheral edge configured to be in contact with the platform; and - a first surface portion configured to form a first cavity between the platform cooling device and the platform, the first surface portion comprising a plurality of impingement holes configured to impinge onto the platform during operation of the turbomachine; and - a second surface portion configured to form a second cavity between the platform cooling device and the platform; and - a barrier configured to be in contact with the platform, the barrier forming a connection between two sections (15, 16) of the edge and separating the first cavity from the second cavity fluidically; characterized in that - a peripheral edge configured to be in contact with the platform; and - a first surface portion configured to form a first cavity between the platform cooling device and the platform, the first surface portion comprising a plurality of impingement holes configured to impinge onto the platform during operation of the turbomachine; and - a second surface portion configured to form a second cavity between the platform cooling device and the platform; and - a barrier configured to be in contact with the platform, the barrier forming a connection between two sections (15, 16) of the edge and separating the first cavity from the second cavity fluidically; characterized in that - the platform cooling device and the blade are separately manufactured components, and - the platform cooling device is connected at the edge to the blade, such that the first cavity and the second cavity are formed between the platform cooling device and the blade, and - the blade comprises a cooling fluid supply passage, connecting a hollow blade core and the second cavity, for supplying of cooling fluid to the second cavity during operation, and - the first cavity is supplied, during operation, with cooling fluid via the impingement holes of the first surface portion.