Abstract: A method for operating a power plant having a gas turbine, a heat recovery steam generator, a steam turbine, an auxiliary heat source, and a control system, wherein the method includes controlling the power plant such that the heat recovery steam generator receives an input of heat from the gas turbine; determining the gas turbine is operating at its maximum capacity or at an upper end of its control range and the power plant is operating at less than a target value for a power plant capacity; determining a target pressure value immediately upstream of the steam turbine, wherein the target pressure value is derived from a primary pressure for the steam turbine and a steam turbine capacity for the steam turbine; based upon the target pressure value, controlling the heat store to release heat into the heat recovery steam generator to achieve the predefined power plant capacity.

Abstract: A contact arm and a method for a disconnect switch, having a profile body and a contact element in electrical contact with the profile body to establish electrical contact with a contact counterpart. The profile body has a first diameter parallel to the contact element. The contact element has a concave surface with a radius of curvature and is arranged on a side directed away from the profile body. The radius of curvature is smaller than the radius of curvature of a circle segment having the first diameter of the profile body. The method includes a contact element of the contact arm establishing electrical and/or mechanical contact with a contact counterpart. A concave surface of the contact element which is directed towards the contact counterpart has a radius of curvature, which is smaller than the radius of curvature of a circle segment having the maximum diameter of the contact element.