GWPR200-L Line (Feeder) Protection Relay

Product Functions

 Full Set of Line Protection Functions

• (ANSI 50/67) Instantaneous Overcurrent Protection (Trip, with optional directional blocking and composite voltage blocking composed of negative-sequence voltage & low voltage)
• (ANSI 50/67) Short-delay Instantaneous Overcurrent Protection (Trip, with optional directional blocking and composite voltage blocking composed of negative-sequence voltage & low voltage)
• (ANSI 51/67) Definite Time Overcurrent Protection (Trip, with optional directional blocking and composite voltage blocking composed of negative-sequence voltage & low voltage)
• (ANSI 51) Inverse Time Overcurrent Protection (Trip, three standard IEC inverse time characteristic curves: Normal / Very / Extreme selectable, composite voltage blocking optional)
• (ANSI 50N) Residual Post-Acceleration Protection (Trip, enabled temporarily after reclosing to accelerate removal of recurring faults)
• (ANSI 49) Overload Protection (Alarm or trip selectable, calculated based on RMS current value)
• (ANSI 50N) Residual Instantaneous Overcurrent Stage I (Trip)
• (ANSI 51N) Residual Definite Time Overcurrent Stage II (Alarm or trip selectable)
• (ANSI 51N) Residual Inverse Time Overcurrent Protection (Trip, three standard IEC inverse time characteristic curves: Normal / Very / Extreme selectable)
• (ANSI 79/50N) Residual Reclosing Post-Acceleration Protection (Trip, dependent on reclosing function)
• (ANSI 79) Three-Phase Single-Shot Auto-Reclosing (No Check / Dead Line Check / Synchronism Check selectable, triggered by protection operation or position mismatch)
• (ANSI 81L) Underfrequency Load Shedding Protection (Trip)
• (ANSI 59) Overvoltage Protection (Trip)
• (ANSI 27) Undervoltage Protection (Alarm or trip selectable)
• (ANSI 59N) Residual Overvoltage Protection (Alarm or trip selectable)
• PT Broken Circuit Supervision (Alarm, detects single-phase, two-phase PT breakage and three-phase voltage loss)
• Control Circuit Broken Supervision (Alarm, monitors integrity of trip/closing coils and external DC power circuits)

All above protection functions are equipped with independent soft enable switches for flexible configuration according to feeder operation requirements.

Auxiliary Functions

• Measurement & Acquisition: Real-time collection of three-phase voltages, residual voltage, three-phase currents, residual current, active/reactive power, frequency, bidirectional electric energy; Standard 14 remote digital inputs (2 configurable pulse counting channels), 8 independent passive trip/closing output relays.
• Event & Time Synchronization: Six categories of data stored separately; 128 records for protection, alarm, remote signal and operation logs, 16 self-check records and 32 fault recording files (captures 4 cycles pre-fault and 6 cycles post-fault); Supports IRIG-B, SNTP and message-based time synchronization, data printing via serial port.
• Local Commissioning: Full-color Chinese LCD HMI, supports setting copying, CB trip & close test, fault waveform review and device parameter query; Complete on-site debugging without background SCADA workstation.

 Core Technical Specifications

• Operating Power Supply: AC100～264V / DC100～264V wide-range universal power supply; Normal power consumption ≤5W, power consumption during protection trip ≤10W
• AC Analog Input: CT secondary rated current 1A or 5A (order-selectable), PT secondary rated voltage 100V, measurement frequency range 35～65Hz
• Circuit Overload Tolerance: Voltage circuit withstands 1.4×Un continuous operation; Current circuit withstands 2×In continuous operation, 10×In for 10s, 20×In for 1s without damage
• Accuracy Index: Protection current setting error ≤±2.5% or ±0.02In (whichever is larger); Frequency measurement error ≤±0.02Hz; Current & voltage measurement Class 0.5, other analog quantities Class 1.0
• Operating Time: Instantaneous element operating time ≤35ms at 1.2×pick-up value (typical value including relay operating time); Time delay error ≤±5% of setting value or ±35ms (whichever is larger)
• Relay Contact: Passive contact, rated capacity 8A@250V AC / 8A@30V DC, operate time ≤8ms, reset time ≤5ms
• Anti-Trip Circuit: Built-in anti-trip relay with dual-coil anti-trip logic (switchable), compatible with electromagnetic and permanent magnet operating mechanisms
• Ambient Conditions: Operating temperature -40℃～70℃, storage temperature -40℃～80℃, relative humidity 5%～90% non-condensing
• Insulation Performance: Insulation resistance between each circuit and earth ≥100MΩ; Power and measuring circuits withstand 2kV 1min power frequency withstand voltage, weak signal circuits withstand 500V 1min power frequency withstand voltage; Withstands 5kV lightning impulse voltage
• Electromagnetic Compatibility: Fully complies with highest grade of GB/T 14598 standard, resistant to ESD, surge, EFT and radiated RF field interference
• Mechanical Performance: Passes Class I vibration, shock and bump tests
• Chassis Structure: Standard embedded metal cabinet with physical isolation between strong powe

Application Scenarios

• Application: Suitable for feeder switchgear, overhead lines, cable feeders and plant outgoing circuits with rated voltage up to 35 kV.
• Applicable Power Systems: Ungrounded, resistance-grounded and arc suppression coil neutral distribution systems (consult the manufacturer for solidly grounded systems)
• Installation Modes: Embedded local mounting in feeder cabinets, centralized panel mounting in main control rooms
• Application Sites: Urban & rural distribution substations, industrial & mining power rooms, park power distribution rooms, distributed PV booster stations, digital intelligent distribution substations

 Core Product Features

• Dedicated feeder protection scheme integrating instantaneous overcurrent, directional element and composite voltage blocking, equipped with complete residual, inverse time and auto-reclosing functions. Three IEC standard inverse time curves are available, and independent soft enable switches for all protections support flexible upstream & downstream feeder time grading coordination.
• Integrated circuit breaker control loop with switchable dual-coil anti-trip function and position supervision, compatible with all 0.2~6A trip/closing coils for electromagnetic and permanent magnet actuators.
• Full-range secondary circuit monitoring, capable of identifying single/two-phase PT breakage and trip/closing circuit faults, and sending real-time alarms to eliminate hidden secondary circuit risks in advance.
• Complete fault data storage system with 32 fault recording files (4 pre-fault and 6 post-fault cycles recorded) and multi-type event logs, facilitating fault analysis and daily operation maintenance.
• Dual Ethernet + RS485 redundant communication, supports Modbus and IEC 103 protocols, and is compatible with IRIG-B, SNTP substation-wide time synchronization schemes.
• Full-color Chinese LCD HMI with hierarchical menus, supports setting copy, CB trip & close test and waveform check; all on-site commissioning can be completed without background SCADA workstation.
• Compact fully-sealed metal cabinet with physical isolation between strong power and weak signal circuits, wide temperature range and high EMC resistance, suitable for indoor feeder cabinets and outdoor cabinet transformers.
• Real-time full hardware self-diagnosis covering memory, AD, communication and output circuits, with local LED alarm indication and remote fault upload for real-time equipment status monitoring.