Abstract: An electrical energy distribution grid is controlled by a control center. Power target values for the real power and reactive power at a transfer point between the energy distribution grid and an electrical energy transport grid are prescribed by a target value device. The target values are to avoid backward feed into the energy transport grid that could lead to malfunctions. The real and reactive power target values are compared with current values at the transfer point. When a deviation of the actual values is determined, an optimization calculation is effected for the real power value and the reactive power value in the energy distribution grid to reduce or remove the deviation. The optimization generates switching commands for controllable operating devices, and a control device transmits the switching commands to the operating devices. There is also described a control center arrangement and a corresponding computer program product.

Abstract: An electrical energy distribution grid is controlled by a control center. Power target values for the real power and reactive power at a transfer point between the energy distribution grid and an electrical energy transport grid are prescribed by a target value device. The target values are to avoid backward feed into the energy transport grid that could lead to malfunctions. The real and reactive power target values are compared with current values at the transfer point. When a deviation of the actual values is determined, an optimization calculation is effected for the real power value and the reactive power value in the energy distribution grid to reduce or remove the deviation. The optimization generates switching commands for controllable operating devices, and a control device transmits the switching commands to the operating devices. There is also described a control center arrangement and a corresponding computer program product.

Abstract: A plough guide trough for plough guides of chain-drawn coal ploughs, comprising two superposed chain guide ducts separated by an integrally cast sliding spacer member, with a top guide strip, a bottom guide beam and a bottom slideway for guiding the plough. The top chain guide duct is covered by a front wall comprising the guide strip and merging into the guide beam and a slot lead-through for a plough guiding hook or plough knife is formed between the guide beam and the slideway. Pockets in the front wall receive a toggle coupling for neighboring plough guide troughs, wherein the front wall, the guide strips, the guide beam, the pockets and a back wall comprising the slideway form a one-piece casting extending over the length of the plough guide trough.

Abstract: A plough guide trough for plough guides of chain-drawn coal ploughs, comprising two superposed chain guide ducts (13,14) separated by an integrally cast sliding spacer member, with a top guide strip (17), a bottom guide beam (18) and a bottom slideway (16) for guiding the plough, wherein the top chain guide duct (14) is covered by a front wall (12) comprising the guide strip (17) and merging into the guide beam (18) and a slot lead-through (23) for a plough guiding hook or plough knife is formed between the guide beam (18) and the slideway (16), also comprising pockets (19,20) in the front wall (12) for receiving toggle coupling means for neighbouring plough guide troughs, wherein the front wall (12), the guide strips (17), the guide beam (18), the pockets (19,20) and a back wall (15) comprising the slideway (16) form a one-piece casting extending over the length of the plough guide trough (10,10A).