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Generator Protection
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The unique generator-transformer unit protection provides the complete main and backup protection of generator-transformer units which comprises generator, main transformer, auxiliary transformer and exciter or excitation transformer. It supports both conventional and Electronic CTs/VTs, It has been widely used in high capacity steam-turbine, gas-turbine and nuclear power generator with different connection modes. Two sets of generator-transformer units support the redundant configuration for vital generator-transformer protection.
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PCS-985B/AW Generator-Transformer Unit Relay
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…
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PCS-985GI Generator Relay
PCS-985GI is a high performance numerical generator protection device, which integrates main and backup protection into one device. It provides complete protection of a generator in power plant, and it also provides basic protection of a generator and an excitation transformer. PCS-985GI can be applied for turbo-dynamo generator, gas-turbine generator, hydro generator and nuclear power generator with different connection modes.PCS-985GI provides up to 56 analog input channels including current and voltage inputs. The generator protections are configurable. Ancillary functions…
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PCS-985GE Generator Relay
PCS-985GE is a kind of high performance numerical generator protection device, which integrates main and backup protection into one device. It provides complete protection of a generator in power plant, and it also provides basic protection of a generator and an excitation transformer. PCS-985GE can be applied for turbo-dynamo generator, gas-turbine generator, hydro generator, pumped storage generator and nuclear power generator with different connection modes.PCS-985GE provides up to 28 analog input channels including current and voltage inputs. The generator protections are …
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PCS-985TI Transformer Relay
PCS-985TI is a high performance numerical transformer protection device, which integrates main and backup protection into one device. It provides complete protection of a transformer in any voltage level, and is typically applied for startup/standby transformer or auxiliary transformer of power plant with multiple branches, and main transformer, etc. It also provides basic protection of a two-winding main transformer and one or two auxiliary transformer.PCS-985TI provides up to 80 analog input channels including current and voltage inputs. The transformer protections are configura…
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PCS-985TE Transformer Relay
PCS-985TE is a kind of high performance numerical transformer protection device, which integrates main and backup protection into one device. It provides complete protection of a transformer in any voltage level, and is typically applied for startup/standby transformer or auxiliary transformer of power plant with multiple branches, and main transformer, etc.PCS-985TE provides up to 36 analog input channels including current and voltage inputs. The transformer protections are configurable. Ancillary functions of fault diagnostic, disturbance records, event records and communication…
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PCS-985U Voltage Injector
The stator earth fault protection with external voltage injector can detect 100% earth faults in the stator windings of generator which is connected with the network via a unit transformer. The auxiliary power supply device PCS-985U can inject low-frequency external power source to the generator stator winding side, PCS-985U coordinate with PCS-985, then one set of integral generator stator ground fault protection with 20Hz voltage injection is formed.The hardware of the PCS-985U is constituted by low-frequency power source, low-frequency filter, converter, voltage-divide re…
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PCS-985RE Rotor Earth-Fault Relay
The PCS-985RE is mainly designed for rotor earth fault by external voltage injection. Because of adopting self-adaptive active switching technology, The PCS-985RE can still supervise rotor insulation even if no excitation voltage is applied. It has high sensitivity and the same sensitivity to any one-point earth fault within the rotor winding. The automatic and manual control function to electric brush ensure rotor earth fault protection can be applied to the brushless exciter units.
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PCS-987R Torsional Stress Relay
Sub-synchronous oscillations (SSO) can occur when the turbinegenerators are connected to the power grid with some electrical cases include: transmission line series capacitors, HVDC converters, large-scale wind power generation, etc. Under the action of SSO, the shaft system of turbine-generator will be in a state of torsional vibration, resulting in fatigue loss. In some severe cases, it may lead to the shaft cracks, bolt cut or coupling twist.PCS-987R is a digital protective relay of torsional stress relay (TSR) which provides monitoring and protection of the torsional vi…
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