Description

The GE WESDAC D20ME is a rugged,modular,and highly reliable Remote Terminal Unit(RTU)originally developed by Westronic(later acquired by GE Grid Solutions,now part of GE Vernova)for use in electric utility substations,generation plants,and industrial power systems.Designed for mission-critical SCADA(Supervisory Control and Data Acquisition)applications,the D20ME provides real-time monitoring,control,and communication of breakers,transformers,relays,meters,and other power system assets.

Built on the legacy of the Westronic D20 platform—a global standard in utility automation since the 1980s—the D20ME(“ME”=Modular Enhanced)adds modern features like Ethernet connectivity,IEC 61850 support(via gateway),enhanced processing,and expanded I/O capacity,while maintaining backward compatibility with existing D20 installations.

It remains widely deployed in North America,Latin America,and parts of Asia for distribution automation,transmission substation control,and hydroelectric plant telemetry.

Key Applications

Transmission Substation Automation:

In a 230/69 kV substation in California,the D20ME collects breaker status,transformer tap positions,and relay alarms via hardwired contacts and serial links.It transmits data to the utility’s control center using DNP3 over fiber Ethernet,enabling remote switching during storms.

Hydroelectric Dam Control:

At a Canadian run-of-river facility,multiple D20ME units monitor generator synchronism,penstock pressure switches,and spillway gate limit switches.They execute local logic(e.g.,“trip unit if bearing temp>90°C”)and report to a central HMI via IEC 60870-5-104.

Legacy System Modernization:

A municipal utility replaced aging electromechanical controls with D20ME RTUs,integrating old electro-mechanical relays(via contact inputs)and new digital meters(via Modbus RTU)—all reported through a single DNP3 stream.

Core Architecture&Features

Feature Specification

Model WESDAC D20ME

Manufacturer GE Grid Solutions(now GE Vernova)

Type Modular RTU/Substation Controller

Processor Embedded real-time processor(Motorola/Freescale PowerPC or ColdFire core)

Real-Time OS Proprietary deterministic OS(based onVRTX or similar)

I/O Capacity Up to 256 I/O points via plug-in modules

I/O Module Types

–DI Digital Input(24–250 VDC/VAC,wet/dry contact)

–DO Digital Output(relay or solid-state,Form C)

–AI Analog Input(0–20 mA,±10 V,RTD)

–AO Analog Output(4–20 mA,±10 V)

–COM Serial Communication(RS-232/485 for meter/relay polling)

Local Logic Supports control logic,interlocks,timers,and math blocks(configured via WESDAC ToolKit)

Communication Ports

–Serial 2–4 ports(RS-232/485),configurable per protocol

–Ethernet 10/100Base-T(RJ-45),supports TCP/IP stack

Supported Protocols

–Utility SCADA DNP3(Level 2),IEC 60870-5-101/104,Modbus RTU/TCP

–Device Integration Modbus RTU(for meters,relays),SEL Fast Message

–Configuration WESDAC proprietary(serial/Ethernet)

Time Synchronization IRIG-B,SNTP,or DNP3 time sync

Redundancy Supports dual-D20ME hot standby(via peer-to-peer link)

Environmental Rating-40°C to+70°C;5%–95%non-condensing humidity

Certifications IEEE C37.90,IEC 61000-4(EMC),UL,CE

Communication&Protocol Strengths

✅DNP3 Mastery:

The D20ME is renowned for its robust,field-proven DNP3 implementation—supporting unsolicited responses,event buffering during outages,and secure authentication(in later firmware).Many U.S.utilities specify it for NERC CIP-compliant telemetry.

✅Multi-Protocol Gateway:

A single D20ME can:

Poll 10+protective relays via Modbus RTU

Read analog transducers via 4–20 mA inputs

Send consolidated data to SCADA via DNP3 over IP

Serve local HMI via Modbus TCP

✅Serial Legacy Integration:

Ideal for brownfield sites:connects to electromechanical relays,pneumatic gauges,and older meters without requiring full system replacement.

Programming&Configuration

WESDAC ToolKit(Windows-based software):

Used to:

Configure I/O modules and scaling

Define DNP3 data objects(binary inputs,analog outputs,etc.)

Program local control logic(ladder-style or function block)

Set up communication channels and device polling

Perform firmware updates

Point Database:

Each I/O point is mapped to a DNP3 object index(e.g.,Binary Input#101=breaker status).Supports Class 1/2/3 event reporting.

Local Autonomy:

Even if SCADA link fails,the D20ME can execute pre-programmed sequences(e.g.,“if bus undervoltage,open feeder breaker after 5 sec”).

Physical&Installation Details

Form Factor:19″rack-mount or panel-mount chassis

Power Supply:24–125 VDC or 120/240 VAC(dual redundant inputs optional)

I/O Modules:Hot-swappable,screw-terminal or pluggable connectors

LED Indicators:Per-module status,CPU activity,comms fault

Grounding:Isolated field ground;meets substation grounding standards

Common Variants&Accessories

Part Number Description

D20ME-CPU Main processor module

D20ME-DI16 16-channel digital input module

D20ME-DO8 8-channel Form C relay output

D20ME-AI8 8-channel analog input(current/voltage)

D20ME-COM2 Dual serial communication module

D20ME-NET Ethernet interface module

D20 Rack 4/8/16-slot backplane chassis

WESDAC ToolKit Configuration software license

⚠️Note:Firmware version must match between CPU and I/O modules.Always verify compatibility before adding modules to an existing system.

Obsolescence&Support Status

The D20ME is in”mature product”status—no longer actively marketed,but fully supported by GE Vernova.

Spare parts and repairs are available through GE’s long-term support program.

Migration path:GE recommends Grid IQ™RTU(e.g.,T650)or SEL-3505/3555 RTUs for new deployments,which offer native IEC 61850,cybersecurity(IEC 62351),and cloud integration.

Why Utilities Still Trust the D20ME

Proven reliability:20+year field life in harsh substations

Deterministic performance:<10 ms response on critical commands

Simple troubleshooting:Clear LED diagnostics,serial console access

Interoperability:Bridges old and new devices seamlessly

Availability&Technical Support

We supply tested,refurbished GE WESDAC D20ME systems—including CPU,I/O modules,racks,and power supplies—with:

Full functional test(I/O simulation,DNP3 polling verification)

Firmware version documentation

Compatibility cross-check with your existing setup

12-month warranty

Our SCADA engineers provide:

DNP3 point list mapping

WESDAC ToolKit configuration assistance

Replacement planning(module-by-module or full RTU swap)

Commissioning support(including protocol testing with DNP3 Master)

Final Note

The GE WESDAC D20ME is more than an RTU—it’s a workhorse of the grid.In an era of rapid digital transformation,its enduring presence in thousands of substations is a testament to rugged design,protocol fidelity,and the utility industry’s demand for“set it and forget it”reliability.

Contact us for datasheets,pinouts,DNP3 conformance statements,or emergency spares for your WESDAC D20ME installation.

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