This model is custom-configured on the 889 platform and integrates core functions such as sub-cycle differential protection, 100% stator earth fault protection, and arc flash protection. It supports high-reliability communication protocols including IEC 61850 Ed2 and PRP, meeting the stringent requirements of critical power generation applications in utilities and industry for fast fault clearing, safe equipment operation, and compliant maintenance. It provides full protection coverage from the generator neutral point to the high-voltage side of the step-up transformer.
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Model Code Breakdown (EP5P5B5LSNANNMAPFBSENNB42)
This model is a custom configuration code for the 889 series. Each segment is defined in accordance with GE official ordering rules:
889: Product series – generator protection system
E: Application standard (Standard)
P5: Three-phase current input (5A) + voltage input configuration
P5: Second set of three-phase current input (5A) configuration
B5: Third set of three-phase current input (5A) configuration
L: Low insertion force withdrawable structure
S: Standard hardware configuration
N: No advanced communication connector
N: No additional function modules
A: Advanced current protection (including 67P, 67_2, 87GD, etc.)
M: Membrane front panel
A: Advanced monitoring functions (including 81A, harmonic detection)
P: Standard control functions (setting group control, virtual inputs, FlexLogic, etc.)
F: Standard control function extension
B: Basic communication configuration
SE: Standard communication interfaces (front USB, rear RS485 + 1 Ethernet port)
N: No advanced communication module
N: No additional communication functions
B: Basic hardware configuration
42: Customized function / version identifier
Core Technical Specifications
1. Electrical Parameters
Current inputs: 3 sets of three-phase 5A current inputs (CT compatible), supporting multi-zone configuration for differential protection
Voltage inputs: Three-phase voltage inputs, suitable for generator terminal / neutral voltage monitoring
Operating power supply: Field-pluggable power module, wide voltage range (typical 85–264V AC/DC)
Measurement accuracy: Current/voltage error ≤ ±0.2%; power/frequency error ≤ ±0.5%
Operating time: Sub-cycle differential protection (<16 ms @ 3× setting, 60 Hz; <20 ms @ 50 Hz); arc flash protection operating time ≤ 2 ms
2. Environment & Reliability
Operating temperature: -40°C to +60°C
Humidity: 0–95% non-condensing
Ingress protection: Front panel IP54; unit compliant with IEC 60255
Manufacturing standard: IPC A-610-E Class 3 (highest electronic manufacturing class), 100% environmental stress screening and full functional testing
Vibration immunity: IEC 60255-21-3 Class 2
3. Mechanical Design
Low insertion force withdrawable design for easy testing, commissioning and maintenance, improving system uptime
Electrolytic capacitor-free design for extended service life
Standard three-proof coating for harsh industrial environments
Core Protection Functions (ANSI Designations)
1. Differential Protection
Generator stator differential (87G): Dual-slope characteristic, 2nd/5th harmonic restraint, advanced CT saturation detection algorithm to ensure reliable operation for internal faults and security for external faults
Generator-transformer overall differential (87O): Covers from generator neutral to GSU transformer high-voltage side, providing dual backup protection; supports restrained/unrestrained instantaneous differential combination
100% stator earth fault protection: Combines overvoltage element and adaptive third-harmonic differential, suitable for high-resistance, low-resistance and hybrid earthing systems to achieve full stator winding earth fault coverage
2. Overcurrent & Voltage Protection
Phase/neutral/earth overcurrent (50/51 series), supporting multiple inverse time curves per IEEE, IEC, etc.
Over/undervoltage (59/27), negative-sequence overvoltage (59_2), volts/hertz (24, overexcitation) protection
Voltage-restrained overcurrent, directional overcurrent (67P/67N), negative-sequence overcurrent (46) protection
3. Generator-Specific Protection
Under-excitation protection (40), reverse power protection (32, anti-motoring)
Frequency anomaly protection (81U/O/R, over/under/slip frequency)
Rotor earth fault protection, stator thermal protection (supports RTD inputs)
Integrated arc flash protection (AFP) monitors internal arc faults in switchgear for fast clearing to minimize equipment damage
4. Control & Monitoring Functions
Circuit breaker control, sequential shutdown, field breaker inconsistency monitoring
Event recording (1024 events), fault waveform recording (transient capture), fault reports (15 records)
Real-time monitoring of current, voltage, power, frequency, harmonics, temperature and other parameters
FlexLogic custom logic, FlexCurve programmable characteristics, multiple setting group switching
Communication & Networking Capabilities
Supported protocols: IEC 61850 Edition 2, OPC-UA, Modbus RTU/TCP, DNP3.0, IEC 60870-5-103/104
High-reliability networking: Dual Ethernet ports, supports IEC 62439/PRP (Parallel Redundancy Protocol) for zero-time communication recovery
Interface configuration: Front USB, rear RS485, 1 Ethernet port; optional Wi-Fi for remote programming/diagnostics
Cybersecurity: Supports AAA, Radius, RBAC, Syslog, meeting NERC/CIP compliance requirements
Applications
Large utility generation units (thermal, hydro, nuclear, wind power integration)
Industrial captive power plants, distributed energy stations
Integrated generator-transformer protection (applications without intermediate taps)
Critical generation facilities requiring strict power regulation and cybersecurity compliance
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