GWPR300-MI Motor Integrated Differential Protection Relay

Core Product Functions

Protection Functions

• (ANSI 87M) Differential Instantaneous Overcurrent Protection (Trip)
• (ANSI 87M) Percentage Differential Protection (Trip)
• (ANSI 87M) CT Break Alarm (Instantaneous signal, delayed alarm)
• (ANSI 87M) Differential Current Overlimit Alarm (Alarm)
• (ANSI 50) Stage I Overcurrent Protection (Trip)
• (ANSI 51) Stage II & III Overcurrent Protection (Trip)
• (ANSI 51) Inverse-Time Overcurrent Protection (Trip; Normal / Very / Extremely inverse characteristics optional)
• (ANSI 49) Overload Protection (Alarm / Trip optional)
• (ANSI 51LR) Locked Rotor Protection (Trip)
• (ANSI 46) Stage I Negative Sequence Overcurrent Protection (Trip)
• (ANSI 46) Stage II Negative Sequence Overcurrent Protection (Alarm / Trip optional)
• (ANSI 46) Inverse-Time Negative Sequence Overcurrent Protection (Trip; Normal / Very / Extremely inverse characteristics optional)
• (ANSI 50N/51N) Stage I & II Zero-Sequence Overcurrent Protection (Trip)
• (ANSI 51N) Stage III Zero-Sequence Overcurrent Protection (Alarm / Trip optional)
• (ANSI 49) Thermal Overload Protection (Alarm / Trip optional)
• (ANSI 48) Long Start-Up Time Protection (Trip)
• Start Interval Control (Motor start blocking)
• Low Voltage Motor Start Blocking (Motor start blocking)
• (ANSI 46) Phase Loss Protection (Trip)
• F-C Circuit Overcurrent Blocking (Trip blocking)
• (ANSI 59) Overvoltage Protection (Trip)
• (ANSI 27) Undervoltage Protection (Alarm / Trip optional)
• (ANSI 59N) Zero-Sequence Overvoltage Protection (Alarm / Trip optional)
• (ANSI 81O) Overfrequency Protection (Trip)
• (ANSI 81U) Underfrequency Protection (Trip)
• (ANSI 60) PT Break Alarm (Alarm)
• Control Circuit Break Alarm (Alarm)
• System Power Loss Protection (Alarm / Trip optional)
• 4-channel Non-electrical Protection (High Temperature Alarm, Overtemperature Trip, Non-electrical Input 1, Non-electrical Input 2; configurable for temperature, gas, pressure and other signals. Each channel supports Alarm / Trip selection.)

Auxiliary Alarm Protections

• CT Break Alarm, Differential Current Overlimit Alarm, PT Break Alarm, Control Circuit Break Alarm. All alarms actuate dedicated alarm relays and light front-panel alarm indicators, requiring manual reset.

Measurement & Control Functions

Analog Measurement (0.2-class high-precision metering)

• Voltage: Phase voltages Ua/Ub/Uc, line voltages Uab/Ubc/Uca, calculated residual voltage 3U0z;
• Current: Motor terminal protection currents ia1/ib1/ic1, motor tail differential currents ia2/ib2/ic2, three-phase measuring currents Ia/Ib/Ic, calculated residual current 3i0z, external direct sampling residual current 3i0;
• Power & electrical parameters: Active Power P, Reactive Power Q, Power Factor COSφ, System Frequency f;
• Energy metering: Forward / Reverse Active Energy EP+, EP-; Forward / Reverse Reactive Energy EQ+, EQ-. Initial energy value preset supported.

Digital Inputs (Status Inputs)

• 21-channel active digital inputs as standard (AC/DC220V / DC110V / DC48V selectable upon order). Acquire circuit breaker status, Remote/Local mode, spring charged status, temperature non-electrical signals, maintenance signal, reset signal, earthing switch position and other equipment status.

Remote Control Outputs

• 13 independent passive relay outputs + 1 dedicated power-fail signal output. Contact rating: 8A@250VAC / 8A@30VDC. Support remote close, remote trip, protection trip, fault alarm, interlock activation and spare expansion outputs. All protection trip outputs can be freely assigned via menu.

Local Human-Machine Operation

• Bilingual LCD HMI (Chinese / English); LED indicators for Running / Operated / Alarm / Fault / Switch Position. Complete menu keypad operation, supporting setting modification, soft switch enable/disable, time calibration, local commissioning test, event / oscillography review and serial printing.

Event Recording & Fault Oscillography

• Event records: 128 protection events, 128 alarm events, 128 status change events, 128 operation records, 16 self-check events with high-precision SOE time tags;
• Fault oscillography: Stores 32 fault waveform records. Captures full-channel voltage & current waveforms covering 4 cycles pre-fault and 6 cycles post-fault. Supports local review, printing and uploading to automation system.

Communication, Time Synchronization & Printing Functions

• Multi-channel hierarchical communication interface: The device is equipped with galvanically isolated dual Ethernet and RS485 communication channels. Dual Ethernet supports IEC 104 with optional IEC 61850 for dual redundant networking; RS485 adopts standard Modbus-RTU for local communication with cabinet-mounted equipment.
• Unified multi-mode time synchronization system: Supports IRIG-B hard time synchronization, SNTP, IEC104/Modbus message time synchronization to realize station-wide time consistency and guarantee accurate time tags for events and oscillography records.
• Local print function: Equipped with serial printing interface for connecting external printers to locally print setting values, event logs, fault oscillography and device version information.
• Remote access authority control: Independent soft switch to govern remote setting modification and remote protection enable/disable authority, balancing operational convenience and on-site safety.

3 Core Hardware Advantages

• High-precision sampling: 16-bit AD sampling plus bad sample filtering algorithm, analog measurement accuracy up to 0.2 class. Electromagnetic compatibility meets the highest national standards;
• Fully modular design: Protection functions can be independently enabled/disabled; relay outputs are freely configurable;
• Comprehensive recording capability: Multi-dimensional storage covering protection, alarm, status change, operation, self-check and oscillography data;
• Wide operating temperature range: Continuous operation from -40℃ to 70℃. Insulation, mechanical and EMC performance satisfy strict power industry standards;
• Flexible ordering options: CT rated current 1A/5A, control power supply AC/DC220V/DC110V/DC48V, IEC61850 protocol, DC analog I/O can be customized on request.

Application Scenarios

• Power Plant / Substation Auxiliary Power System: Comprehensive differential and backup protection for low and medium voltage high-power asynchronous motors including fans, water pumps, air compressors, coal mills and circulating water pumps;
• Metallurgical / Chemical / Mining Power Distribution System: Complete integrated protection for crushers, belt conveyors, compressors and heavy-duty agitator motors. Adaptable to heavy starting conditions, dusty and humid environments, compatible with winding temperature, gas and other non-electrical signals;
• Municipal Water Supply / Wastewater Treatment Plant Power Distribution System: Integrated protection against earth fault, phase loss and undervoltage for low-voltage feed pumps, sludge pumps and aeration fans;
• Data Center / Commercial Complex Power Room System: Cooling water pumps, air-conditioning fans and fire-fighting motors. Compatible with F-C circuit logic, PT break detection and undervoltage start blocking control;
• PV / Wind / Energy Storage Power Station Auxiliary System: Cooling fans and high-power auxiliary motors at booster stations. Support dual-port IEC61850 digital communication, station-wide time synchronization and uploading fault oscillography to automation system;
• LV/MV Switchgear & Box Transformer OEM Supporting System: Standard embedded panel mounting with cutout dimensions, separated power and signal terminal design. 1A/5A CT and multi-voltage control power supply available, suitable for standardized switchgear integration in various cabinet types。