Description

GE Multilin D25 Substation Controller

The GE Multilin D25, also cataloged as the D25 Substation Automation Controller, operates as a dedicated hardware component for data concentration, automation logic execution, and electrical monitoring within substation control network platforms.

Hardware Specifications

Parameter	Specification
Model	D25
Brand	GE Multilin
Dimensions	19-inch rack-mount modular industrial chassis
Device Classification	Substation Automation Controller / Multi-Function IED
Processor & OS	32-bit RISC architecture with QNX real-time operating system
Internal Memory	64 MB DRAM, 32 MB Flash Memory
Digital Inputs	Up to 128 configurable status inputs with wetting voltage selection and chatter filtering
Digital Outputs	Up to 64 control outputs including trip/close control pairs
DC Analog Inputs	Up to 32 inputs
Analog Outputs	Up to 16 outputs
AC Measurement Inputs	Direct 1 A or 5 A CT inputs and VT inputs
Communication Ports	Dual redundant Ethernet 10/100 Mbps, RS-232/RS-485 serial, fiber optic interfaces, modem options
Supported Protocols	IEC 61850 GOOSE and Server, DNP3, Modbus RTU/TCP, IEC 60870-5-101/103/104, SPABus, Courier
Fault Recording	Up to 16 MB local storage, waveform records in COMTRADE format
Time Synchronization	IRIG-B, SNTP/NTP over Ethernet, protocol-based synchronization
Display Options	Optional Data Display Panel (DDP) or Graphical Display Panel (GDP)

Ethernet Communication and Firmware Flash Compatibility

The GE Multilin D25 uses modular industrial communication resources for substation data exchange, including dual redundant Ethernet interfaces and serial communication channels. The controller supports firmware storage through internal flash memory and maintains compatibility with configured application functions, communication drivers, and LogicLinx soft logic execution environments. Network configuration includes protocol handling for IEC 61850 messaging, DNP3, and Modbus communication between field devices, protection relays, and SCADA systems.

The D25 supports deterministic data transfer behavior through configured communication paths, allowing status acquisition, control commands, and event records to be processed within defined substation automation architectures. Firmware management requires compatibility verification between installed hardware configuration, application software, and communication modules.

Frequently Asked Questions (FAQ)

Q: Does the D25 support hot-swap replacement of internal modules?
A: The D25 is a modular rack-mounted controller. Hot-swap capability depends on the installed hardware configuration and module type. Replacement procedures must follow the applicable GE Multilin service documentation.

Q: What type of fault records can the D25 store?
A: The D25 stores digital fault records with waveform oscillography in COMTRADE format and sequence-of-events information for substation analysis.

Q: How does the D25 synchronize time for event recording?
A: The controller supports IRIG-B input, SNTP/NTP over Ethernet, and protocol-based time synchronization methods for event timestamp alignment.

Field Installation Guidelines

Install the D25 in a suitable 19-inch rack enclosure with appropriate mechanical support and ventilation clearance according to the equipment installation requirements.

Use shielded communication cables for serial and Ethernet-connected field devices where required by the site grounding practice. Terminate cable shields according to the substation grounding design to reduce electromagnetic interference.

Separate low-level analog signal wiring from high-current power conductors and switching circuits. Verify CT and VT wiring polarity, terminal assignment, and insulation conditions before energizing measurement circuits.

Confirm communication addressing, protocol parameters, and time synchronization settings before connecting the controller to the station network. Validate digital input states and output control circuits during commissioning using approved test procedures.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems