HV Relay Protection

Line Protection

NR's fast and reliable protection & control devices, such as line distance relay and differential relay. 

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  • RCS-931 Line Differential Relay

    RCS-931 Line Differential Relay

    The RCS-931 relay is an advanced current differential protection with stepped distance elements and overcurrent elements intended for main and backup protection for transmission lines with single-pole trip, three-pole trip and auto-reclosing...

  • RCS-925 Voltage Relay with DTT Supervision

    RCS-925 Voltage Relay with DTT Supervision

    The RCS-925 relay provides overvoltage and fault detector protection for transmission lines. It can receive tripping commands from the relay at the opposite end of line via communication channel(direct transfer trip). Transfer trip associates...

  • RCS-922 Stub Differential Relay

    RCS-922 Stub Differential Relay

    The RCS-922 relay is a current differential protection for a stub between two breakers in one-and-a-half breaker arrangements or ring breaker arrangements. The function is activated when the line isolator is open. It can also be applied as...

  • RCS-924 Stub Differential Relay

    RCS-924 Stub Differential Relay

    The RCS-924 relay provides current differential protection with overcurrent elements for one-and-a-half breaker and ring breaker applications. It integrates 3 or 4 CT inputs for three-terminal or four-terminal system. It provides overcurrent......

  • PCS-924 Stub Differential Relay

    PCS-924 Stub Differential Relay

    The PCS-924 numerical relay provides current differential protection, sum overcurrent protection and feeder end fault protection for the T-zone in breaker-and-a-half arrangement and ring breaker arrangement. It integrates the three groups of CT......

  • RCS-943 Line Differential Relay

    RCS-943 Line Differential Relay

    The RCS-943 relay provides complete set of main and backup protection for overhead transmission lines and underground cables of all voltage levels, including current differential element,stepped distance elements, stepped overcurrent element...

  • RCS-941 Line Distance Relay

    RCS-941 Line Distance Relay

    The RCS-941 relay is a digital distance protection used as the main and back-up protection for overhead transmission lines and ungrounded cables, including phase-phase and phase-ground distance element, overcurrent element with three-pole tripping...

  • RCS-901 Line Directional Comparison Relay

    RCS-901 Line Directional Comparison Relay

    The RCS-901 relay is a pilot directional protection used as the main and backup protection for transmission lines with stepped distance elements,overcurrent elements, single-pole trip, three-pole trip and auto-reclosing functions. The relay can...

  • PCS-931 Line Differential Relay

    PCS-931 Line Differential Relay

    The RCS-931 relay is an advanced current differential protection with stepped distance elements and over current elements intended for main and backup protection for transmission lines with single-pole trip, three-pole trip and auto-reclosing......

  • RCS-902 Line Distance Relay

    RCS-902 Line Distance Relay

    The RCS-902 is used as the main and back-up protection for transmission lines with pilot distance element, stepped distance elements, overcurrent elements, single-pole trip,three-pole trip and auto-reclosing functions. The integrated voltage......

  • PCS-902 Line Distance Relay

    PCS-902 Line Distance Relay

    The PCS-902 relay provides numerical line protection with pilot distance protection, stepped distance protection, current protection, voltage protection, single and/or threepole tripping and auto -reclosing functions. As a full-scheme device......

Busbar Protection

The centralized and distributed busbar protection provide scalable busbar and breaker failure protection for various busbar configurations. 

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  • PCS-915ID Distributed Busbar Protection

    PCS-915ID Distributed Busbar Protection

    The PCS-915ID distributed busbar protection is used for protecting and monitoring various busbar arrangement with all voltage levels, including single busbar with/without section, double busbar with/without sections, double busbar with transfer...

  • RCS-9628 Busbar Voltage Relay

    RCS-9628 Busbar Voltage Relay

    The RCS-9628 busbar voltage relay is designed for the voltage protection, control and monitoring of busbar in impedance grounded, Peterson coil grounded and ungrounded system. The relay is suitable to be flush mounted into a control panel.

  • RCS-915 Centralized Busbar Protection

    RCS-915 Centralized Busbar Protection

    The RCS-915 series busbar protection devices provide main and back-up protection of busbars for all kinds of busbar wiring configurations, such as single busbar, double busbar,double busbar with transfer bus, double busbar with...

  • PCS-915IC Centralized Busbar Protection

    PCS-915IC Centralized Busbar Protection

    The PCS-915IC centralized busbar protection provides comprehensive and scalable busbar and breaker failure protection of single busbar with/without section, double busbar with/without sections, double busbar with transfer bus,...

Transformer Protection

Transformer protection provides full-scheme protection and control for various transformer applications. 

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  • RCS-9624 Transformer Management Relay

    RCS-9624 Transformer Management Relay

    The RCS-9624 transformer management relay is designed for fast and selective short-circuit protection, control and monitoring of transformers (substation-used or grounding transformers) in impedance grounded or Peterson coil grounded or ungrounded...

  • RCS-9622 Transformer Management Relay

    RCS-9622 Transformer Management Relay

    The RCS-9622 transformer management relay is designed for the fast and selective short-circuit protection, control and monitoring of transformers (substation-used or grounding transformers) in impedance grounded or Peterson coil grounded or......

  • RCS-9661 Transformer Auxiliary Relay

    RCS-9661 Transformer Auxiliary Relay

    The RCS-9661 is a transformer auxiliary relay, which provides mechanical protection and relay paralleling or switchover functions (optional). The signals of mechanical protection can be configured from non-electrical quantities, such as gas...

  • RCS-9621 Transformer Management Relay

    RCS-9621 Transformer Management Relay

    The RCS-9621 transformer management relay provides fast and selective short-circuit protection, control and monitoring of transformers(substation-used or grounding transformers) in impedance grounded, Peterson coil grounded or ungrounded system......

  • RCS-9681 Transformer Overcurrent Relay

    RCS-9681 Transformer Overcurrent Relay

    The RCS-9681 is a digital protection, control and monitoring unit for power transformer in solidly grounded, impedance grounded, Peterson coil grounded and ungrounded system.It provides complete backup protection of each side of power...

  • RCS-9679 Transformer Protection

    RCS-9679 Transformer Protection

    The RCS-9679 relay is a microprocessor-based relay designed for the protection of two-winding power transformers with various kinds of connect groups. Up to three CT inputs can be provided.

  • RCS-9671 Transformer Differential Relay

    RCS-9671 Transformer Differential Relay

    The RCS-9671 is a microprocessor-based relay designed for the protection of two-winding or three-winding power transformers with maximum four CT inputs. The protection relay is recommended to be applied to power transformers,short feeders or...

  • PCS-9671 Transformer Differential Relay

    PCS-9671 Transformer Differential Relay

    The PCS-9671 is a microprocessor-based relay designed for the protection of two-winding or three-winding power transformers with maximum three CT inputs. It also can be used to protect reactors or applied as an stub differential protection......

  • RCS-974 Transformer Auxiliary Relay

    RCS-974 Transformer Auxiliary Relay

    The RCS-974 provides auxiliary protection for transformers including mechanical protection, pole disagreement protection and breaker failure protection. The source of mechanical protection can be designed from non-electrical quantities such as...

  • PCS-974 Transformer Auxiliary Relay

    PCS-974 Transformer Auxiliary Relay

    The PCS-974 relay provides mechanical protection for transformer tanks. The source of mechanical protection can be designed from non-electrical quantities, such as gas, oil temperature, winding temperature, pressure and oil level. It receives...

  • RCS-978 Transformer Protection

    RCS-978 Transformer Protection

    The RCS-978 relay is a full scheme protection used for the main and backup protection for various transformer applications, including two-winding transformers, threewinding transformers, and auto-transformers. Up to 6 CT inputs can be integrated...

  • PCS-978 Transformer Protection

    PCS-978 Transformer Protection

    The PCS-978 numerical protection system can provide full-scheme protection and control in one rack for various transformer applications, including two-winding transformers,three-winding transformers and auto-transformers. It also can be used to......

Generator-Transformer Protection

The unique generator-transformer unit protection provides the complete main and backup protection of generator-transformer units which comprises generator, main transformer. 

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  • RCS-9659 Auto Synchronizer

    RCS-9659 Auto Synchronizer

    RCS-9659 is a digital synchronizer that determines the proper time to initiate closing of circuit breaker to parallel a generator and bus, or to reclose a line. In order to fulfill different application requirements, it offers three...

  • RCS-985TS Transformer Protection

    RCS-985TS Transformer Protection

    The RCS-985TS provides transformer protection for twowinding and three-winding main transformers, auxiliary transformers and startup/standby transformers in power plants with voltage level up to 220kV. It integrates protection,control and...

  • RCS-985T Transformer Protection

    RCS-985T Transformer Protection

    The RCS-985T is a high-performance transformer protection intended for the applications to startup/standby transformers and auxiliary transformers in power plants. This full-integrated transformer protection integrates protection, control and......

  • RCS-985RS/SS Generator Protection

    RCS-985RS/SS Generator Protection

    The RCS-985RS/SS are complete protection solution designed for the appliations to medium to steam turbine generator, water turbine generator and gas turbine generator with small to medium capacity. It adopts dual CPU configuration for fault...

  • RCS-985G Generator Protection

    RCS-985G Generator Protection

    The RCS-985G is a generator protection intended for the application to sophisticated generators, including turbogenerators,hydro-generators, gas turbine generators and pumped-storage generators. It supports wall surface mounted and flush...

  • RCS-985A/B/C Generator-Transformer Unit Protection

    RCS-985A/B/C Generator-Transformer Unit Protection

    The RCS-985A/B/C generator-transformer unit protection provides comprehensive protection, control and monitoring of small to large generators,generator-transformer units,main transformers, auxiliary transformers, excitation transformers and...

  • PCS-985 Generator-Transformer Unit Protection

    PCS-985 Generator-Transformer Unit Protection

    The PCS-985 provides the complete main and backup protection of generator-transformer units which usually comprises generator, main transformer, auxiliary transformer and exciter or excitation transformer. It supports connections to...

Auxiliary Protection Devices

  • PCS-9830 Point-on-Wave Controller of CB

    PCS-9830 Point-on-Wave Controller of CB

    The PCS-9830 point-on-wave controller is a three-phase control device for circuit breakers (CBs) to open or close at the specified phase angle on voltage waveform to minimize the impulse caused by switching. The controlled switching technology......

  • RCS-923 Breaker Failure Protection

    RCS-923 Breaker Failure Protection

    The RCS-923 is designed to provide breaker failure initiation and auxiliary protection for circuit breakers. It also can be used as the overcurrent protection of bus coupler or bus section. The RCS-923 integrates breaker failure protection......

  • RCS-921 Breaker Failure Protection

    RCS-921 Breaker Failure Protection

    The RCS-921 relay is a breaker failure relay with automatic reclosing used for the protection of circuit breakers in all kinds of busbar arrangement. It integrates breaker failure protection, overcurrent protection, pole discrepancy protection...

  • PCS-921 Circuit Breaker Protection

    PCS-921 Circuit Breaker Protection

    The PCS-921 numerical relay provides the protection of circuit breakers with breaker failure protection, pole discrepancy protection, dead zone protection, phase/neutral overcurrent protection, single and/or three-pole auto-reclosing and...

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