digital Generator Protection Relays

• The GWPR200‑GB/LV Low‑Voltage Generator Backup Protection Relay provides comprehensive backup protection, measurement, monitoring and control functions for 400‑V low‑voltage generators up to 1000 kW. It supports both local installation in switchgears and centralized panel‑mounted installation.
• Supports RS485 Modbus‑RTU, Ethernet IEC 60870‑5‑103 protocol;
• Compatible with IRIG‑B time‑code, SNTP, and message‑based time synchronization;
• Capable of storing protection events, alarm events, remote signal status changes, operation logs, self‑test events, and fault recording data.

• GWPR300‑GT Generator‑Transformer Unit differential Protection Relay is an integrated protection, measurement and control device launched by GoWatron specifically for generator‑transformer units. It is designed for small‑to‑medium‑size generator‑transformer units with capacity up to 10 MW (typical application scope; other capacities can be customized), compatible with generator‑transformer connections at voltage levels up to 132 kV. It supports both centralized panel‑mounted and decentralized field‑mounted deployment. It is mainly applied for relay protection and local / remote measurement‑control requirements of generator‑transformer units in self‑supply power plants and small‑scale power stations.
• Communication: Dual Ethernet ports support IEC 60870‑5‑104 / 103 protocols, IEC 61850 is optional; RS485 supports Modbus‑RTU.
• Time Synchronization: Supports IRIG‑B (DC code), SNTP, message‑based time synchronization and other time‑sync modes.

The GWPR300‑GI is a generator integrated protection relay independently developed and manufactured by GoWatron. It provides differential protection and complete backup protection for medium‑and‑small‑size generators.

• Ethernet: 2 Ethernet ports supporting IEC 60870‑5‑103 / IEC 60870‑5‑104, with optional IEC 61850
• Serial Port: RS‑485 interface supporting Modbus‑RTU, with optional IEC 60870‑5‑103
• Time Synchronization: IRIG‑B, SNTP, and communication‑based time synchronization
• Print Function: Supports serial dot‑matrix printer for printing setting reports, event logs and fault oscillography records
• Event Upload: Protection events, alarm events, remote signal status changes, operation logs and self‑check events can be uploaded to the SCADA monitoring system

The GoWatron GWPR300-GRE generator rotor earth fault protection relay is designed for hydro-generators with ratings up to 10 MW and turbo-generators with ratings up to 100 MW. When deployed in conjunction with the GWPR300-GD Generator Differential Protection Relay (ANSI 87G) and the GWPR300-GB Generator Backup Protection Relay from the same product series, it forms a complete generator unit protection system. The relay supports two installation configurations: centralized panel mounting and decentralized local mounting.

• Communication links: Dual Ethernet ports plus one RS485 serial interface, supporting parallel multi-channel transmission;
• Supported protocols: Mainstream international power system communication protocols including IEC 60870-5-104 (shortened as IEC 104), IEC 61850 (MMS optional), and Modbus-RTU;
• Time synchronization: Supports IRIG-B, SNTP, and message-based synchronization (IEC 104 clock synchronization) with high synchronization accuracy;
• Local data output: Equipped with a serial printer port for on-site printing of setting values and fault event records.

The GWPR300-GB generator backup protection relay, independently developed by GoWatron, is applicable to hydro-generators with a unit capacity of ≤10 MW, steam turbine generators with a unit capacity of ≤100 MW, as well as gas generators and large-capacity diesel generator sets.

• Equipped with dual Ethernet ports and an RS485 interface, the unit is compatible with conventional substation automation systems and smart power plants.
• Standard protocols: IEC 60870-5-104 and Modbus RTU. It uploads measured values, status indications, protection operation events, alarms, fault records, and settings.
• Optional protocol: IEC 61850 (MMS and GOOSE), for integration into smart power plant networks.

The GWPR300-GD Generator Differential Protection Relay is mainly designed for differential protection of 10 MW hydro generators and steam turbine generators rated up to 100 MW. It is usually mounted on the same panel alongside the GWPR300-GRE Generator Rotor Earth Fault Protection Relay and GWPR300-GB Generator Back-up Protection Relay to form an integrated generator protection system.

• Communication;2× Ethernet (IEC 103/104) + 1× RS485 (Modbus-RTU). Optional: 2 extra Ethernet for IEC 61850.
• Time Sync；IEEE 1588 PTP, SNTP, IRIG-B.
• Fault Recording；128 protection/alarm/remote signals, 128 operation logs, 16 self-test logs, 32 fault waveforms (full timestamps & data).
• Measurement & Control；Monitors 3-phase electrical parameters. 21 DI, 13 relay outputs, 1 power-loss alarm output.