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110kV substations protective technological transformation |
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| Yanzhou Mining (Group) Company Jining 2nd Coal Mine will be the main transformer substations 110kV into the project and the original protective systems into advanced computer protection systems to adapt to the modern pit production needs. Dhi two mine is the first company to adopt the pit 110kV voltage electricity substations levels, a total of two back into the lane, three-round, three Taiwan SFLT-12500/110 main transformers, wiring is more complex. Protection of the original question is : Since the introduction of electromagnetic-type components are, wiring complex components exposed, causing access to undesirable oxide contact Yi, reliability and sensitivity greatly reduced. Maintenance; Protective value of the whole will be cumbersome, precision low; Disc size, testing surveillance complex economic poor. This transformation objectives are : to ensure security of electricity supply and retain the original protective premise simplified wiring performance. To further enhance the accuracy and reliability of protective, additional three lines of the current protection as backup protection for the PT breakwire of timely inputs; The change has also increased CT, PT breakwire protection. They therefore adopted DFP-210-based computer-type circuit protection devices replace PXH-112X four lines protective uniform type protection devices. Double-circuit television to enter the protective operation of a way to change the methodology, all charged operation, has power to transform. First transformation standby circuit, qualified operational tests after transforming another circuit. Transformation and the effect of contrast : moves into a slower pace of the general; By high selectivity and sensitivity to prevent mistaken moves it into accessible various identity; Automatically change the value set by the great difficulty becoming easier; Abnormal response to the original input waveform Bulingmin it is not easy to mistakenly move, analog and digital filtering is required. are not handled properly may mistaken move; other equipment and substations to achieve reliable integration will not affect the normal operation of substations to improve the functioning of the economy. (Lijianfeng) |
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