Vízügyi Közlemények, 1973 (55. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

b) The weir The weir is arranged symmetrically about the centerline of the cut, between the power station and the navigation lock. It serves the purpose of maintaining the desired headwater levels and of releasing the excess discharges. This is accomplished by five weir openings of 24 m clear span each, with the sill at El. 80.20 m A.O.D. and controlled by steel radial gates topped by tilting leaves capable of maintaining a head of 11.0 m (Fig. 2.1-4). The main closing organs are hoisted and lowered by oil-hydraulic hoisting gear, by means of a hydraulic cylinder moving together with the gate and inserted between the radial arm and the suspension girder near the top plane of the pier. The hydraulic thrust acting on the shield is transmitted by the two 14 m long radial arms to the steel pivot pins and thence to the r.c. piers. The introduction of the tremendous concentrated forces into the pier body presented special problems. The monolithic foundation slab of the weir with elevated sill is 141.6 m long and 41 m wide. Below the short upstream apron the reinforced concrete cutoff is connected to the foundation slab. The tailwater apron downstream of the weir is 30 m long over a double filter layer, perforated by porous concrete blocks terminated at its connection to the channel by a trench-wall cutoff of reinforced concrete and protected by a rip-rap blanket. The gates of the weir are operated from the control center at the right-hand bank. c) The power station The power station is situated in a bay on the right-hand bank along the weir. The area of the powerhouse building is 441.1 by 67.1 m in plan. The recessed powerhouse is equipped with four tubular turbines having runners of 4.3 m diameter forming integral units with the generators. The units operate at a normal speed of 107 r.p.m. The runner shafts are spaced at 11.5 m distances at El. 77.55 m A.O.D. Under the rated head of 6.27 m each of the turbines discharges 140 cu.m/sec, or a total of 560 cu.m/sec with the generators supplying 4 X 7,000 = 28,000 kVA to the grid (Fig. 2.1—5). The current generated at 2.5 kV tension by the horizontal-shaft alternators is fed to two banks of transformers of 14/14/14 MVA capacity and 2.5/20/120 kV voltage and thence over the switching station to the 120 kV and 20 kV grids. In an average year the output of the power station is 103 million kWhours. Mounting and repair work on the generating sets is accomplished with the help of an overhead travelling crane of 20/5 ton capacity within the powerhouse and of the external travelling crane. For mounting and removal of the mechanical equipment the hatch covers in the roof of the power station are removed. The control room of the power station is accommodated in the wingbuilding on the right-hand bank. The same building houses the assembly bay, the service rooms and some auxiliary equipment as well as the 20 kV switchgear. 270