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Phone：+86 17062388866Description
The GE Grid Solutions N70032702L (formerly ALSTOM) is a high-speed digital protection relay module designed for the UR-series (Universal Relay) platform, delivering advanced generator and prime mover protection for utility-scale power generation assets. This critical module integrates 32-bit DSP processing with adaptive algorithms to monitor voltage, current, frequency, and synchronism across hydro, thermal, and combined-cycle plants. The N70032702L executes ANSI/IEEE-compliant functions including 24/27/40/50G/59G/81 protection elements with <1>
ALSTOM N70032702L
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | N70032702L |
| Manufacturer | GE Grid Solutions (formerly ALSTOM Power) |
| Product Type | Digital Generator Protection Relay |
| Protection Functions | 24 (Volt/Hertz), 27 (Undervoltage), 40 (Field Loss), 50G/51G (Ground Fault), 59G (Neutral OV), 81 (O/U Frequency) |
| Operating Time | <16> |
| Inputs | 12x CT/VT (1A/5A configurable), 8x binary |
| Outputs | 16x Form-C relay contacts (5A @ 250V AC) |
| Synchrophasor Compliance | IEEE C37.118 Class P (PMU) |
| Communication | Dual Ethernet (IEC 61850-8-1 GOOSE, Modbus TCP), RS485 |
| Accuracy | ±0.2% (voltage/current), ±5 mHz (frequency) |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
| Housing | 4U height, 19″ rack-mount |
| Certifications | IEEE C37.90, IEC 60255, UL 508 |
| Power Supply | 48-250V DC / 85-264V AC (dual redundant) |
Main Features and Advantages
Adaptive Generator Protection: Implements dynamic impedance-based (40) and third-harmonic voltage (27TN) algorithms to detect field winding failures under varying load conditions. Machine inertia compensation prevents nuisance trips during grid disturbances.
Synchronism Check & Closing Control: Integrated 25 function validates phase angle (<20>
Cybersecurity Hardened: Role-based access (IEC 62351) with audit trails and GOOSE message authentication. Physical write-protect switch prevents unauthorized logic modifications.
Distributed Bus Architecture: Supports IEC 61850 Process Bus (9-2LE) for merging unit integration, reducing wiring by 60% versus hardwired solutions.
Advanced Diagnostics: Continuous self-monitoring of CT saturation, ADC health, and memory integrity. Event capture buffers 256 oscillography records with COMTRADE export.
Application Field
The GE N70032702L protects critical generation assets:
Hydroelectric Plants: Prevents overspeed (12) during load rejection and monitors stator core hot spots via RTD inputs.
Combined-Cycle Gas Turbines: Detects loss-of-field (40) during grid faults and enables FAST turbine valving.
Coal-Fired Units: Guards against motoring (32) during boiler trips and syncs to grid via auto-synchronizer (25A).
Industrial Cogeneration: Islanding detection (81R) with seamless transfer between grid/standalone modes.
Nuclear Facilities: SIL-2 certified for Class 1E backup protection with seismic qualification (IEEE 344).
ALSTOM N70032702L
Related Products
N60 Generator Relay: For smaller units (<50>
GPM-100: Dedicated generator protection module for Mark VIe turbine control
UR L90 Line Differential Relay: Transmission counterpart for grid interconnection
EX2100e Excitation Control: Integrated field regulation via IEC 61850
IS200EPDMG1A: Redundant processor module for UR platform
F650 Digital Bay Controller: Switchgear integration partner
GE EnerVista UR Setup: Configuration software suite
Siemens 7UM62: Comparable multi-function generator protection
Installation and Maintenance
Pre-installation preparation: Verify CT saturation characteristics (Knee point ≥ 120V). Isolate all AC/DC sources before mounting. Use shielded twisted pairs for analog inputs with single-point grounding. Configure IEC 61850 SCL files via EnerVista prior to energization.
Maintenance recommendations: Perform annual injection testing of all protection elements. Monitor breaker contact wear via I²t accumulators. Update firmware during planned outages using digitally signed packages. Replace backup supercapacitor (BCU module) every 8 years.
