GE DS3820EOMA Emergency Overspeed Module

الوصف

The GE DS3820EOMA is an Emergency Overspeed Module for the Mark IV Speedtronic turbine control system. It is a safety-critical component specifically designed to monitor turbine speed and initiate a protective trip (shutdown) if the speed exceeds a predefined, safe limit. This is a crucial, hardwired safety function that operates independently of the main control logic.

Technical Breakdown 🧠

This module is a core part of the Mark IV’s overspeed protection system, designed for maximum reliability and fault tolerance.

• Safety-Critical Monitoring: The primary purpose of the DS3820EOMA is to prevent a catastrophic turbine failure due to overspeed. It receives signals from dedicated speed sensors, typically magnetic pickups mounted to the turbine shaft. These signals are conditioned and continuously monitored by the board’s internal circuitry.
• Hardware-Based Trip: The emergency overspeed trip is a hardwired, high-speed function. Unlike a control action that relies on software, the trip signal from the EOMA board is sent directly to the trip solenoids and relays. This ensures that the shutdown is initiated with minimal delay, regardless of the state of the main control software.
• Signal Handling: The module is specifically configured to process the signals from the speed sensors, which are typically in the form of pulse trains. The module counts these pulses to determine the turbine’s rotational speed, which it then compares against the overspeed trip setpoint.

Applications 🏭

The DS3820EOMA is a fundamental component in the emergency trip systems of Mark IV turbine control panels for:

• Gas Turbines
• Steam Turbines
• Hydro Turbines

It serves as the last line of defense against overspeed conditions, providing a critical layer of safety for both equipment and personnel.