GE D20 M+SS Comprehensive Substation Controller

Advanced Automation, Control & Data Management for Electrical Substations

Overview

The GE D20 M+SS is a powerful and highly adaptable substation controller engineered to optimize automation, control, and data management across modern electrical substations. Serving as the central intelligence in substation automation systems, the D20 M+SS ensures secure, reliable, and efficient power distribution.

Key Features

1. Data Concentration & Protocol Conversion

• Gathers, filters, and organizes data from multiple IEDs and RTUs, regardless of vendor.

• Supports 100+ communication protocols, including:

• DNP3

• IEC 60870-5-101/104

• GE D.20 Link (proprietary)

• Enables seamless integration with SCADA systems and substation devices.

2. Local Automation Capabilities

• Executes both simple and complex local logic control.

• Supported automation applications include:

• Capacitor bank control

• Trip reclosing

• Automatic Voltage Control (AVC)

• Fault location and isolation

• Load transfer and shedding

• Includes a built-in Calculator Module for logical and mathematical functions.

3. Modular & Scalable Design

• Multiple chassis types available to fit different deployment needs.

• Supports distributed I/O architecture in star or ring topologies.

• Accommodates:

• Up to 120 D20 I/O modules

• Larger configurations via D200 series

• Available I/O module types:

• Digital inputs

• Control outputs

• Analog inputs/outputs

4. Data Logging & Storage

• Integrated Sequence of Events (SOE) recorder for digital/analog data.

• Logs and exports to PCs, printers, or CSV files.

• Maintains historical data on:

• Time-stamped analogs

• Accumulators

• Status and current values

5. Reliability & Environmental Resilience

• Built to operate in harsh substation environments.

• Compliant with standards:

• EN 61000-6-2 (EMC immunity)

• EN 61000-6-4 (EMC emissions)

• Features redundant system support and extensive self-diagnostics:

• Program memory and RAM tests

• Serial port and watchdog timers

• Power supply monitoring

• Configuration integrity checks

6. Cybersecurity & User Access Control

• Supports user authentication and RADIUS server integration.

• Ensures secure access to devices and data.

7. Remote Access & System Diagnostics

• Remote device access through virtual terminal.

• LAN service capabilities include:

• TFTP

• Time Server/Client

• SPT Server/Client

• Tracks communication statistics for maintenance and diagnostics.

Technical Specifications

Note: Specifications may vary slightly based on model and configuration.

Processor & Memory

• CPU: 32-bit microprocessor (e.g., D20ME II)

• Flash Memory: 2 MB

• SRAM: 1.5 MB

• NVRAM: 512 KB

• BootROM: 1 MB

• Clock: TCXO, ±2 ppm, 1.0 ms resolution

Communication Interfaces

• Serial Ports: 7+ RS-232 / RS-485 ports (varies by chassis)

• D.20 Link Ports: HDLC protocol for D20 I/O module connectivity

• Ethernet: Optional with support for wireless Ethernet, PPP, and TCP/IP

• Maintenance Port: 1 x RS-232

I/O Module Example (D20C)

• Digital Inputs (DI): 16 channels

• Control Outputs (CO): 8 channels (momentary or trip/close)

• Analog Inputs/Outputs (AI/AO):

• Options for 16 analog inputs

• Or 8 analog inputs + 8 analog outputs

Power Supply Options

• 20–60 VDC

• 100–300 VDC / 85–264 VAC

• Additional auxiliary power ranges available

Physical Specifications

• Chassis (Non-VME): 19" W × 5.25" H × 8.1" D

• Dimensions & weight depend on system configuration

Environmental Tolerances

• Operating Temperature: –20°C to +70°C (–4°F to +158°F)

• Storage Temperature: –40°C to +85°C (–40°F to +185°F)

• Humidity: 5% to 95% RH (non-condensing)

• Complies with IEC 60068-2 for vibration, shock, and drop