Description
DS3800NHVD1E1E Product Overview
The DS3800NHVD1E1E is a high-voltage power-supply and signal-conditioning board used inside GE Mark IV turbine and EX2000 exciter control racks. It plugs into the 6BA Euro-card file and serves three primary roles:
The DS3800NHVD1E1E is a high-voltage power-supply and signal-conditioning board used inside GE Mark IV turbine and EX2000 exciter control racks. It plugs into the 6BA Euro-card file and serves three primary roles:
-
Bridge Power – It converts the raw 120–240 VAC control transformer output into regulated +24 Vdc for contactor coils and ±15 Vdc for SCR/IGBT gate drives.
-
Signal Buffering – It scales armature-voltage and bridge-current feedback down to ±10 V so the 5 V CPU A/D converters are protected from the 480 V class power electronics.
-
Over-Voltage Protection – On-board 40 mm MOVs clamp line surges; when a MOV fails, the epoxy-sealed trace opens, isolating the fault and preventing cascade damage to downstream cards.
Because the board is epoxy-sealed and non-repairable, it is treated as a consumable spare—any internal fault requires a complete card swap rather than component-level rework. The dual 40-pin back-plane connectors make installation straightforward: rack the old card, move the two gate leads and the 24 V lug, snap the connectors, and the CPU acknowledges “HV POWER OK” on the next scan.
GE DS3800DDMA1A1B
DS3800NHVD1E1E Technical Specifications
-
Model Number: DS3800NHVD1E1E
-
Manufacturer: General Electric
-
Product Type: High-Voltage Power / Bridge-Supply Board
-
Series: DS3800, Mark IV / EX2000 Speedtronic
-
Input Voltage: 120–240 VAC, 47–63 Hz (control transformer)
-
Output Rails: +24 Vdc @ 3 A (contactor bus); ±15 Vdc @ 0.5 A (gate drive)
-
Analog Feedback: 2 differential ±10 V outputs (armature volts, bridge current)
-
Surge Protection: 40 mm MOVs, 1 kJ rating, integral with board traces
-
Isolation: 1500 Vdc input-to-logic; 2.5 kV optical on gate fibers
-
Operating Temperature: 0 – 60 °C (board rating)
-
Storage Temperature: -40 – 80 °C
-
Board Size: 6BA Euro-card ≈ 233 × 160 mm
-
Weight: ≈ 0.22 kg
-
Repairability: Non-repairable epoxy-sealed construction
-
Core Features & Customer Value
Integrated Power & Protection: The module combines bridge power, gate drive, and surge clamping on one card. For the maintenance crew this means fewer spare part numbers to stock and a single five-minute swap instead of troubleshooting three separate boards.
Epoxy-Sealed Construction: All copper layers are encapsulated in high-temperature epoxy. In environments with high humidity, dust, or conductive contamination the seal prevents trace-to-trace shorting that would otherwise cause random “HV POWER FAIL” alarms after ten-plus years of service. The trade-off is non-repairability—any internal fault requires a whole-card exchange—but this is offset by the reduced diagnostic time and the fact that plants stock one spare instead of maintaining a repair bench.
Wide AC Input Window: The board accepts 120–240 VAC directly from the control transformer. This allows the same part number to be used on 120 V or 240 V services without additional taps or selectors, simplifying spares inventory and reducing wiring errors during retrofit projects.
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV exciter cubicle where it powers the SCR bridge and clamps lightning-induced surges on the 480 VAC feeder. During a black-start the card ramps the 24 V contactor bus and the ±15 V gate supply in sequence, preventing the bridge from firing into an un-powered CPU.
On mechanical-drive gas compressors the same module is used to supply gate power to the variable-speed drive SCR stack. The on-board MOV string protects the bridge when the utility tie experiences switching surges, while the scaled ±10 V feedback signals allow the CPU to compute firing angle in real time. Because the card is line-replaceable, a surge event that damages any internal layer is corrected with a five-minute swap rather than a half-shift re-cabling job.
