GE WESDAC D20 C Turbine Board

GE Multilin  WESDAC D20 C is a 369 Series Motor Management Relay designed for protection, monitoring, control, and diagnostics of medium-size three-phase AC motors. It integrates motor overload protection, current monitoring, RTD temperature monitoring, event recording, and advanced diagnostic functions.

1. Model Interpretation

Model:  WESDAC D20 C

2. Main Features

Motor Protection Functions

• Three-phase motor protection
• Thermal overload protection
• Phase loss / phase imbalance protection
• Locked rotor and stall protection
• Ground fault protection
• Undervoltage / overvoltage monitoring
• Motor starting supervision

The relay continuously analyzes motor operating conditions and adapts protection based on measured motor characteristics.

Temperature Monitoring

• Integrated 12-channel RTD inputs
• Supports:
  • 100 Ω platinum RTD
  • 100 Ω nickel RTD
  • 120 Ω nickel RTD
  • 10 Ω copper RTD

Suitable for monitoring:

• Motor stator temperature
• Bearing temperature
• Winding temperature

Enhanced Diagnostics (E Option)

The enhanced version provides:

• Enhanced front display with motor status indicators
• Motor Health Report
• Enhanced learned data
• Motor Start Data Logger
• Enhanced event recorder
• Security audit trail events

3. Technical Specifications

4. Structural Composition

The relay consists of:

• Microprocessor-based protection unit
• Current measurement circuits
• RTD temperature input module
• Digital input/output circuits
• Relay output contacts
• Communication interface
• Front-panel display and keypad
• Event and waveform recording memory

5. Application Fields

Typical applications include:

• Power plants
• Oil & gas facilities
• Water treatment plants
• Mining systems
• Industrial manufacturing
• Pump and compressor protection
• Medium-voltage motor control centers (MCC)

Common protected equipment:

• Pumps
• Fans
• Compressors
• Conveyors
• Large industrial motors

6. Advantages

• Comprehensive motor protection in a single device
• Real-time motor condition monitoring
• Improved motor availability and reduced downtime
• Advanced fault recording for troubleshooting
• RTD-based thermal monitoring
• Enhanced diagnostics for predictive maintenance

7. Conclusion

The GE WESDAC D20 C is a high-voltage-control-power motor protection relay with built-in 12 RTD inputs and enhanced diagnostic capabilities. It is well suited for industrial motor applications requiring reliable protection, detailed operational analysis, and condition monitoring.