GWPR300‑GI Generator Integrated Protection Relay Front View

GWPR300‑GI Generator Integrated Protection Relay Left Side View

GWPR300‑GI Generator Integrated Protection Relay Right Side View

GWPR300‑GI Generator Integrated Protection Relay Terminal Diagram

GWPR300‑GI Generator Integrated Protection Relay

Functions(ANSI) 87G 50/50G 51/51G 51V 49 46 40 32 81O 81U 59/59N 27 60 86 64G

Product Desc

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

Request Quote

+8617621210051

+86-17621210051

Operate Time

≤35 ms

Differential Fast Trip

≤25 ms

Measurement Accuracy

Voltage/Current: ±0.2%

Communications

Modbus-RTU/ IEC 60870-5-104/103/61850

Technical Support

24/7 Expert Support

Fast Delivery

Global Shipping

Warranty

2 Year Warranty

Product Overview

GWPR300‑GI Generator Integrated Protection Relay = One GWPR300‑GD Generator Differential Protection Relay + One GWPR300‑GB Generator Backup Protection Relay.
This relay integrates a full suite of generator protection functions. It is widely applied in medium‑and‑small hydropower stations, waste‑heat power plants, coal‑bed‑gas power plants, diesel generator sets, biogas power plants and gas‑fired power plants.
It is applicable for hydro‑turbine generators up to 3 MW and steam‑turbine generators up to 10 MW.
It is an integrated device combining differential protection, backup protection, measurement and control functions. Rich communication interfaces allow interoperation with other protection relays and intelligent devices to construct a complete power‑plant automation system. Flexible installation modes: panel‑mounted in protection cubicles or directly mounted inside high‑voltage switchgear.

Protection Functions

(ANSI 87G) Differential instantaneous protection (Trip)
(ANSI 87G) Percentage‑biased differential protection (Trip, 2nd‑harmonic restraint & CT circuit open blocking available)
(‑) CT circuit open alarm (Alarm, blocks percentage‑biased differential protection)
(‑) Differential current exceedance alarm (Alarm)
(ANSI 50) Stage‑I over‑current protection (Trip, composite voltage blocking optional)
(ANSI 51) Stage‑II over‑current protection (Trip, composite voltage blocking optional)
(ANSI 51) Stage‑III over‑current protection (Trip, composite voltage blocking optional, over‑current memory function supported)
(ANSI 51V) Inverse‑time over‑current protection (Trip, normal / very / extremely inverse curves selectable, composite voltage blocking optional)
(ANSI 49) Overload protection (Alarm / Trip selectable)
(ANSI 46) Negative‑sequence over‑current Stage‑I protection (Trip)
(ANSI 46) Negative‑sequence over‑current Stage‑II protection (Alarm / Trip selectable)
(ANSI 46) Negative‑sequence inverse‑time over‑current protection (Trip, normal / very / extremely inverse curves selectable)
(ANSI 50G) Zero‑sequence over‑current Stage‑I protection (Trip, zero‑sequence voltage blocking optional, calculated / external zero‑sequence signal selectable)
(ANSI 51G) Zero‑sequence over‑current Stage‑II protection (Trip, zero‑sequence voltage blocking optional, calculated / external zero‑sequence signal selectable)
(ANSI 51G) Zero‑sequence over‑current Stage‑III protection (Alarm / Trip selectable, calculated / external zero‑sequence signal selectable)
(ANSI 40) Loss‑of‑excitation protection (Trip, machine‑terminal impedance criterion, positive‑sequence undervoltage blocking)
(ANSI 32) Reverse‑power protection (Trip)
(ANSI 81O) Over‑frequency protection (Trip, undervoltage blocking & df/dt slip‑frequency blocking available)
(ANSI 81U) Under‑frequency protection (Trip, undervoltage blocking & df/dt slip‑frequency blocking available)
(ANSI 59) Over‑voltage protection (Trip)
(ANSI 64G) Stator Ground Fault Protection (Alarm/Tripping selectable)
(ANSI 27) Under‑voltage protection (Alarm / Trip selectable, VT circuit open blocking available)
(ANSI 59N) Zero‑sequence over‑voltage protection (Alarm / Trip selectable, calculated / external zero‑sequence voltage signal selectable)
(ANSI 86) System loss of supply protection (Alarm / Trip selectable)
(ANSI 60) VT circuit open alarm (Alarm)
(‑) Trip circuit supervision alarm (Alarm)
(‑) Non‑electrical protection‑Thermal / hydraulic accident (Alarm / Trip selectable)
(‑) Non‑electrical protection‑Excitation fault (Alarm / Trip selectable)
(‑) Non‑electrical protection‑Electrical accident (Alarm / Trip selectable)

(‑) Measurement & Control Functions:

Acquisition of 3‑phase voltages, 3‑phase currents, zero‑sequence quantities, active power P, reactive power Q, power factor, four‑quadrant energy measurement; 21‑channel binary inputs, 13 independent programmable relay outputs, 1 device power‑loss alarm output; storage for protection events, alarm events, remote signal events, operation records, self‑check events and fault oscillography records

Notes

CT circuit open alarm, differential current exceedance alarm, system loss of supply, trip circuit supervision alarm and non‑electrical inputs are monitoring / binary‑input logics without standard ANSI device numbers defined in IEEE C37.2‑2008, marked as (‑).
Suffixes 51V, 50G, 51G and 59N are widely‑adopted industry‑extended identifiers and are not basic IEEE C37.2 standard device numbers.

Application Scenarios

Large‑capacity diesel generator sets: For projects requiring both differential and backup protection, supporting both grid‑connected and islanded operation. Typical applications: internet data centers, cloud‑computing centers, large‑scale commercial complexes, grade‑A hospitals, airport emergency power‑supply units.
Coal‑bed‑gas generator sets: Protection and control for coal‑mine methane and coal‑bed‑gas power‑generation projects. Typical applications: underground methane‑drainage power stations, coal‑bed‑gas comprehensive‑utilization power stations, mine captive power stations.
Medium‑and‑small steam‑turbine generators: For steam‑turbine generators up to 10 MW used for auxiliary power and captive power plants. Typical applications: industrial captive thermal power plants, steel‑plant waste‑heat steam‑turbine units, chemical‑plant captive generator sets.
Small hydro‑turbine generators: Complete protection relay for hydropower stations up to 3 MW. Typical applications: rural hydropower stations, mountain diversion‑type hydropower stations, village‑level distributed hydropower, private‑owned hydropower renovation projects.
Distributed captive‑power stations: For factory captive units, waste‑heat power, biogas‑fired generators under grid‑connected or islanded operation. Typical applications: large‑scale livestock‑farm biogas power plants, landfill power plants, sewage‑treatment‑plant biogas power generation, industrial‑park waste‑heat‑utilization power stations.
Substation automation retrofitting projects: Generator protection relays supporting IEC 60870‑5‑103 / IEC 60870‑5‑104 and Modbus‑RTU, with optional IEC 61850. Typical applications: secondary‑system upgrade of legacy power plants, intelligent reconstruction of old hydropower stations, monitoring‑system renewal for captive power plants.
On‑site cubicle / panel‑mount installation scenarios: Used within switchgear and protection cubicles. One single relay replaces two separate relays (differential plus backup), saving cabinet space and integrating protection, measurement, remote signalling, remote control and fault oscillography. Typical applications: complete Generator Protection Panel, built‑in protection inside high‑voltage switchgear, local control cabinets for distributed‑energy stations.

Frequently Asked Questions (FAQ)

Q:What is the GWPR300‑GI? Is it a single relay or two separate relays?

GWPR300‑GI is a single integrated device integrating the functions of a differential protection relay (GWPR300‑GD) and backup protection relay (GWPR300‑GB) into one compact unit. It is a fully integrated differential, backup, measurement and control device, delivering a complete generator protection solution within a single chassis. This design saves panel space, reduces wiring complexity and simplifies system integration.

Q:What protection functions does the GWPR300‑GI offer for diesel generator sets?

The GWPR300‑GI provides a comprehensive protection suite for diesel generator sets, including:
• ANSI 87G – Differential & percentage-biased differential protection for stator winding faults
• ANSI 32 – Reverse power protection to prevent generator motoring upon diesel engine failure
• ANSI 81O/81U – Over-frequency and under-frequency protection against speed deviations caused by prime mover malfunctions
• ANSI 50/51 – Stage I to III overcurrent protection with composite voltage blocking
• ANSI 40 – Loss-of-excitation protection to avoid generator overheating
• ANSI 46 – Negative-sequence overcurrent protection for unbalanced load conditions
• ANSI 49 – Thermal-model-based overload protection for accurate stator winding protection
• ANSI 59/27 – Overvoltage and undervoltage protection
For parallel-operated diesel gensets, the relay also supports reverse power and frequency protection to guarantee stable operation under grid-connected or islanded modes.

Q:Can the GWPR300‑GI operate in both grid-connected and islanded modes?

Yes. The GWPR300‑GI supports both grid-connected (parallel) and islanded (standalone) operation.
In islanded mode, it provides under-frequency, over-frequency, undervoltage and overvoltage protection optimized for single-source power systems.
In grid-connected mode, it features reverse power protection (ANSI 32) to prevent generator motoring, plus synchronism check and frequency ride-through capability for stable parallel operation.

Q:What communication protocols does the GWPR300‑GI support?

The GWPR300‑GI provides flexible communication options for integration with SCADA and power plant automation systems:
• Ethernet: 2 ports supporting IEC 60870‑5‑103 / IEC 60870‑5‑104; IEC 61850 available as an option
• Serial Port: RS‑485 interface supporting Modbus‑RTU; IEC 60870‑5‑103 optional
• Time Synchronization: IRIG‑B, SNTP and channel-based time synchronization
• Event Upload: All protection events, alarms, binary status changes, operation logs and self-monitoring events can be uploaded to the SCADA system via communication protocols.

Q:How does the GWPR300‑GI protect against CT circuit open or differential current exceedance?

The GWPR300‑GI features dedicated alarms for CT circuit open and excessive differential current:
• CT circuit open alarm: Activates upon CT circuit discontinuity and can be configured to block percentage-biased differential protection to avoid nuisance tripping.
• Differential current exceedance alarm: Monitors abnormal differential current and raises an alarm before the trip threshold is reached, enabling operators to proactively investigate potential faults.
These monitoring and binary logic functions serve as supplementary support for the primary ANSI 87G differential protection

Q:What are the typical applications for the GWPR300‑GI?

The GWPR300‑GI suits a wide range of generator protection applications, including:
• Large-capacity diesel generator sets – Emergency power supply for data centers, cloud computing hubs, commercial complexes, hospitals and airports
• Coal-bed methane generator sets – Underground gas drainage stations and mine captive power plants
• Medium & small steam turbine generators – Up to 10 MW captive power plants for steel, chemical and thermal industries
• Small hydro turbine generators – Up to 3 MW rural and village hydropower stations
• Distributed captive power plants – Biogas, landfill gas and waste heat recovery power generation
• Substation automation retrofitting – Compatible with IEC 60870‑5‑104, IEC 60870‑5‑103, Modbus‑RTU, with optional IEC 61850