Current protection relay PCS-985B/AW

for generatorsfor turbinesdifferential

PCS-985 generator-transformer unit protection can be applied for turbo-dynamo, gas-turbine, hydro, pumped storage and nuclear power generator with different connection modes. It supports conventional CT/VT and ECT/EVT, and provides interfaces for power plant automation. For medium to large generator, two sets of PCS-985 protections can be used to achieve duplicated protection configuration. Two PCS-985 protections use different CT groups, and main and backup protection in one PCS-985 share one group of CTs. PCS-985B provides complete protection scheme for a turbo-dynamo or nuclear power generator-transformer unit which usually comprises generator, main transformer, step-down transformer and exciter or excitation transformer. PCS-985AW can be applied for large-scale hydro or pumped storage generator-transformer unit with different connection modes. • Current differential protection of generator-transformer unit (87GT) • Current differential protection of generator (87G) • Current differential protection of main transformer (87T) • Current differential protection of step-down transformer (87T) • Current differential protection of excitation transformer or exciter (87E)