A wind park for feeding electrical power into an electrical supply network at a network connection point, comprising: - at least two wind turbines for generating electrical power; - a DC park network for transmitting electrical power from the wind turbines to the network connection point, wherein at least one electrical load and/or an energy store is/are arranged in the park network in order to be able to electrically consume power inside the park network if the supply network and the park network are isolated, and the park network is in the form of a ring network or a mesh network; and - an inverter which is arranged between the DC park network and the network connection point and is set up to transform electrical DC voltage of the DC park network into an AC voltage in order to feed the electrical power of the wind turbines into the electrical supply network; - at least one DC-DC converter for feeding electrical power from at least one wind turbine into the DC park network, wherein - the DC-DC converter has a switching device and a transformer with a primary side and a secondary side, - the primary side is coupled to the at least one wind turbine via the switching device, - the secondary side is coupled to the DC park network via at least one rectifying means, in particular a rectifying means having a plurality of diodes, and - the DC-DC converter is set up to apply a DC voltage of changing polarity to the primary side of the transformer by means of the switching device in order to thereby transform a DC voltage of the at least one wind turbine from the primary side to the secondary side, and - the DC park network has at least one isolating switch for isolating a fault in a section of the DC park network, wherein the isolating switch can connect and/or isolate sections of the park network in order to enable selective DC park network disconnection, wherein - the at least one isolating switch can be used to carry out a short interruption or an automatic reclosing respectively and/or to isolate a fault, and wherein - the primary side of the transformer can be galvanically decoupled via the switching device, wherein the electrical decoupling is carried out by opening switching means which are arranged in the switching device in order to achieve complete galvanic decoupling between the wind turbine and the DC park network. - at least two wind turbines for generating electrical power; - a DC park network for transmitting electrical power from the wind turbines to the network connection point, wherein at least one electrical load and/or an energy store is/are arranged in the park network in order to be able to electrically consume power inside the park network if the supply network and the park network are isolated, and the park network is in the form of a ring network or a mesh network; and - an inverter which is arranged between the DC park network and the network connection point and is set up to transform electrical DC voltage of the DC park network into an AC voltage in order to feed the electrical power of the wind turbines into the electrical supply network; - at least one DC-DC converter for feeding electrical power from at least one wind turbine into the DC park network, wherein - the DC-DC converter has a switching device and a transformer with a primary side and a secondary side, - the primary side is coupled to the at least one wind turbine via the switching device, - the secondary side is coupled to the DC park network via at least one rectifying means, in particular a rectifying means having a plurality of diodes, and - the DC-DC converter is set up to apply a DC voltage of changing polarity to the primary side of the transformer by means of the switching device in order to thereby transform a DC voltage of the at least one wind turbine from the primary side to the secondary side, and - the DC park network has at least one isolating switch for isolating a fault in a section of the DC park network, wherein the isolating switch can connect and/or isolate sections of the park network in order to enable selective DC park network disconnection, wherein - the at least one isolating switch can be used to carry out a short interruption or an automatic reclosing respectively and/or to isolate a fault, and wherein - the primary side of the transformer can be galvanically decoupled via the switching device, wherein the electrical decoupling is carried out by opening switching means which are arranged in the switching device in order to achieve complete galvanic decoupling between the wind turbine and the DC park network.