A consortium composed of the Siemens Industrial Solutions and Services Group and Siemag has received an order from SDIC Xinji Energy to supply three winders for two coal mines in Anhui Province in China. The Siemens scope of supply comprises the winding motors, including converters, as well as the power, automation and safety systems. The total order value is around €14 million.

Xinji Energy is a leading coal producer in the east province of Anhui. It is building two new shaft installations in Banji and Kouzidong. The Banji mine, which will be supplied with a new winder, will have a hoisting capacity of 3 Mt/y by the end of 2007. The installation in Kouzidong is to produce around 5 Mt/y of coal with the help of two new winders.

The three units of the identical winding installations are four-rope friction wheel ground-mounted machines with a diameter of 4.8 m. Siemens is supplying the synchronous motors, each with an output of 4.7 MW, as well as the associated Simovert D 12-pulse cyclo-converters. Motors and converters are air-cooled. The drives will be controlled by an FM458 Simatic application module. For safety reasons, the controller has two channels. The signals of these two channels will be compared with each other continuously. Any discrepancy will trigger a safety circuit which will immediately stop the drives and apply the safety brakes. A visualization system with an operator console will be available for operator control and monitoring. The scope of supply also includes high-voltage transformers, the low-voltage switchgear and motor blowers. The winders have an emergency operating mode, which means that, even if faults occur in a converter or tran sformer, production can continue at half speed but with the full load of 32 t. Siemens is also responsible for commissioning the equipment on site whereas Siemag is responsible for the mechanical components.

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