GE DS200NATOG2A – Voltage Feedback Scaling Board (NATO Board)

Technical Specifications

• Manufacturer: General Electric (GE)
• Model: DS200NATOG2A
• Series: DS200 Series (Speedtronic Mark V/VI Control Systems)
• Board Type: Voltage Feedback Scaling Board (NATO)
• Input Configuration: 5 precision resistor strings (3 for AC phases, 2 for ±DC bus)
• Input Voltage Ranges (Configurable): 6900V, 4200V, 3300V, 2200V, 1200V (AC/DC)
• Output Interface: 20-pin ribbon header (5-channel analog output)
• Protection Components: Metal Oxide Varistors (MOVs) for overvoltage protection
• Configuration Method: 3 input stab connectors + 2 wire jumpers per string
• Power Supply: 24 VDC (from VME backplane)
• Power Consumption: Max 8 W
• Dimensions (L×W×H): 147 mm × 51.5 mm × 114 mm
• Weight: 0.5 kg (unit only); 1.2 kg (shipping weight)
• Operating Temperature: 0°C to +65°C (32°F to 149°F)
• Storage Temperature: -40°C to +70°C (-40°F to 158°F)
• Relative Humidity: 5%–95% (non-condensing)
• Certifications: CE, UL, CSA (industrial safety & EMC compliance)
• Country of Origin: United States

Key Features

1. Precision Voltage Attenuation
   • Five identical precision resistor strings (1 per AC phase, 2 for DC buses) deliver accurate, stable voltage scaling for high-voltage SCR bridge signals.
   • Configurable via jumpers and stab connectors to support five standard high-voltage input ranges (1200V–6900V), adapting to diverse turbine excitation setups.
2. Robust Overvoltage Protection
   • Integrated Metal Oxide Varistors (MOVs) on each resistor string prevent output overvoltage if the ribbon cable is disconnected while input voltage is applied, safeguarding downstream control circuitry.
   • Isolated signal design eliminates cross-talk between AC phase and DC bus monitoring channels.
3. Optimized G2 Variant Design
   • The G2 configuration replaces two bottom resistors with jumpers, reducing component count and improving long-term reliability.
   • Four resistors per string (vs. five in older variants) simplify calibration and lower maintenance costs.
4. Seamless System Integration
   • Designed for direct installation in standard VMEbus racks of Mark V/VI turbine control systems, compatible with existing backplanes and gate distribution boards.
   • 20-pin ribbon header provides a compact, reliable output interface for connection to the controller’s analog input modules.
5. Industrial-Grade Reliability
   • Ruggedized PCB and components withstand wide temperature fluctuations and high electrical noise in power plant environments.
   • No fans required for cooling, ensuring maintenance-free operation and reducing system downtime.

Application Scenarios

1. Power Generation (Core Application)
   • Gas Turbine Excitation Control: Scales high AC/DC voltages from the SCR bridge in gas turbine excitation systems, providing accurate feedback for voltage regulation and generator synchronization.
   • Steam Turbine Power Control: Monitors and scales DC bus voltages for steam turbine SCR-based power conversion systems, ensuring stable load control and grid compliance.
   • Combined-Cycle Power Plants: Integrates with Mark V/VI control systems in combined-cycle facilities to support coordinated gas/steam turbine operation and high-efficiency power generation.
2. Industrial Turbine & Drives
   • Oil & Gas Compression: Used in turbine-driven compressor systems for natural gas pipelines and refineries, providing precise voltage feedback for variable-speed drive control.
   • Process Industry Drives: Supports SCR bridge voltage monitoring in large industrial drives (e.g., steel mill rolling mills, paper machine drives) powered by gas/steam turbines.
3. Renewable & Distributed Energy
   • Hydroelectric Turbine Control: Scales voltage signals from SCR excitation systems in large hydroelectric plants, ensuring reliable generator voltage control and grid integration.
   • Distributed Power Islands: Deployed in remote industrial facilities or microgrids with turbine-based power generation, enabling stable voltage regulation and system protection.

Compatibility Notes

• Fully compatible with GE Speedtronic Mark V and Mark VI turbine control systems.
• Interfaces with IS200/DS200 series I/O modules and VME backplanes for seamless system integration.
• Replaces older NATO board variants (e.g., DS200NATOG1A) as a drop-in upgrade with enhanced reliability and easier configuration。