DS200ADGIH1AAA - Auxiliary DC 2000V Generator Interlock / Control Card

SPECIFICATIONS:

Part Number: DS200ADGIH1AAA
Manufacturer: General Electric
Series: EX2000
Product Type: Auxiliary DC 2000V Generator Interlock / Control Card
Analog output current: 0-20 mA
Power Requirements: +5 V dc
Operating temperature: -30 to + 65 �C
Size: 17.8 cm wide x 33.02 cm
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION

DS200ADGIH1AAA is an Auxiliary DC 2000V Generator Interlock / Control Card manufactured and designed by General Electric as part of the EX2000 Series used in GE Excitation Gas Turbine Control Systems. The interlock and control functions are associated with a high-voltage (2000V) auxiliary direct current (DC) system used to support the generator excitation and protection systems. This subsystem plays a critical role in ensuring safe operation, startup, synchronization, and shutdown of the turbine-generator unit. It interfaces closely with the turbine control system (TCS), generator control panels (GCP), and excitation control systems (such as static excitation systems or brushless exciters).

OPERATION:

The 2000V DC auxiliary system is often derived from a station battery system or a dedicated auxiliary DC bus and is primarily used for generator excitation, especially in static excitation systems where high DC voltage is directly applied to the generator field winding via a thyristor bridge. The interlock and control (INTR/CO) portion includes hardwired logic or programmable logic controller (PLC)-based interlocks that ensure critical sequences are enforced.
The generator breaker cannot close unless the field voltage is established.

• Field flashing is blocked unless permissive signals (like turbine at rated speed, field breaker closed) are satisfied.
• Faults (overvoltage, overcurrent, ground fault) in the 2kV DC system trigger trip signals to the turbine control system via fast-acting interlocks.
• Protection relays (ANSI 59, 64, 87G, 40) for generator protection.
• Synchronizing relays during grid synchronization.
• Turbine supervisory instruments (TSI) ensuring mechanical readiness.

INSTALLATION:

In a typical gas turbine installation, the AUX DC2K GEN INTR/CO system components are housed within installation includes high-voltage DC cabling with insulation rated above 2kV, robust grounding systems, and interconnection with analog/digital I/Os of the Turbine Control System (e.g., Mark VIe, Woodward, or Allen-Bradley PLCs). Interface relays, fuses, and isolators are used to segment circuits for safety and maintenance. The DC interlock wiring must follow strict segregation and shielding practices to prevent electrical noise and interference with sensitive turbine control electronics.

• Excitation cabinets
• Generator control panels
• Auxiliary power distribution panels

COMPATIBILITY:

Compatibility is critical between the 2kV DC system and the rest of the gas turbine�s electrical control and protection infrastructure. The interlock/control circuits must:

• Match the control logic of the turbine controller (via discrete I/Os, relay logic, or Modbus/TCP signals).
• Be coordinated with the Excitation Control System (e.g., Basler DECS, GE EX2100).
• Work in sync with breaker management relays (e.g., SEL-751, GE Multilin SR489).

Moreover, signal exchange between the gas turbine controller and generator protection relays is essential for coordinated fault handling and trip execution. The 2kV DC system must also be designed to handle load transients, regeneration effects, and insulation aging over time.

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FREQUENTLY ASKED QUESTIONS:

What is an Auxiliary DC 2000V Generator Interlock / Control Card?

The Auxiliary DC 2000V Generator Interlock / Control Card is a specialized control module used in gas turbine systems to manage interlocks and control logic associated with the 2000V DC auxiliary power supply, primarily for the generator excitation and protection systems. It facilitates safe sequencing, breaker control, field flashing, and fault isolation.

What types of faults can this card detect?

The card is capable of detecting various electrical and logical faults, such as overvoltage and undervoltage in the DC system, field ground faults, open circuit conditions, breaker misoperations, and sequencing errors. It can also respond to missing or invalid permissive signals and initiate protective shutdowns if required, ensuring system integrity during abnormal conditions.

How does the card interact with the gas turbine control system?

The interlock/control card interfaces with the gas turbine control system via discrete inputs and outputs, or through communication protocols such as Modbus or Profibus. It exchanges status signals, fault conditions, and command logic to ensure synchronization between the turbine and generator subsystems.