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GE DGP54BACA

Product Name​
GE DGP54BACA Digital Generator Protection Relay
Product Introduction​
The GE DGP54BACA is a microprocessor-based generator protection, metering, and control relay from the GE Multilin DGP54 series. It consolidates the full protection suite for medium and large synchronous generators in one 160 mm panel device.
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Detailed content

Technical Specifications​
  • Auxiliary Supply: 110–125 VDC / 110–120 VAC
  • Current Inputs: 1 A or 5 A nominal (CT secondary)
  • Voltage Inputs: 110/120 VAC (PT secondary)
  • Measurement Accuracy: ±0.2 % current/voltage, ±0.5 ms time
  • Analog Channels: 12 (8 current + 4 voltage)
  • Binary Inputs: 16 optically isolated
  • Relay Outputs: 8 programmable trip/close, 4 logic outputs
  • Event Records: 512 time-stamped SOE entries
  • Disturbance Recording: 256 cycles at 4000 Hz sample rate
  • Communication: Dual Ethernet, RS-485, IEC 61850 MMS/GOOSE, Modbus, DNP3.0
  • Panel Cutout: 152 mm × 152 mm
  • Front Protection: IP54, rear IP20
  • Operating Temperature: -20 °C to +55 °C
Functional Features​
  • Generator differential 87G with percentage restraint
  • Stator ground 64G (fundamental zero-sequence + third-harmonic)
  • Rotor ground 64F (one-point and two-point)
  • Loss-of-field 40 with asynchronous impedance circle
  • Reverse power 32, over-frequency 81O, under-frequency 81U
  • Negative sequence 46 with I²t rotor heating model
  • Out-of-step 78, overvoltage 59, undervoltage 27
  • Built-in synchrocheck and automatic synchronizer option
  • CT saturation detection and PT loss supervision
Material Composition​
  • Front bezel: flame-retardant PC/ABS alloy, dark gray
  • Housing: coated aluminum/steel rear case
  • Internal PCB: FR-4 with acrylic conformal coating
  • Terminals: nickel-plated copper spring clamps
Structural Characteristics​
  • 160 mm × 160 mm flush-mount faceplate
  • 128 × 64 backlit LCD with 5 navigation keys
  • Four-row rear spring terminal block
  • Dual redundant Ethernet ports on rear RJ-45 or fiber
Working Principle​
Secondary AC quantities from generator CT/PT pairs pass through antialiasing filters and simultaneous-sample ADCs into a 32-bit DSP. Protection elements evaluate phasor math every millisecond; on threshold breach the corresponding output relay is energized and SOE/disturbance records are written to non-volatile memory.
Application Scenarios​
  • Thermal, hydro, nuclear generator units
  • Gas-turbine combined-cycle main generators
  • Industrial captive power plants 20 MW and above
Installation Requirements​
  • Panel cutout 152 × 152 mm, cabinet depth ≥ 120 mm
  • CT/PT cables shielded, shield grounded once at relay end
  • Auxiliary DC from UPS or station battery, not shared with noisy loads
Usage Precautions​
  • Setting changes only by protection engineer with GE tool license
  • Perform six-vector load test before putting differential in service
  • Firmware upgrade only with GE-signed package

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