GE IS220PTURH1A Primary Turbine Trip Module

The GE IS220PTURH1A is a PTUR Primary Turbine Trip Module designed for the Mark VIe Speedtronic turbine control system. It performs turbine-specific protection functions by processing speed-related inputs and interfacing with turbine trip logic. The module is identified by functional revision A and is associated with the GEH-6725R instruction manual.

Functional Description

The PTUR pack provides the electrical interface between one or two I/O Ethernet networks and a turbine control terminal board. It combines a common Mark VIe processor board, a turbine-specific control board, and an analog acquisition daughterboard.

The module processes turbine protection signals and communicates with the Mark VIe controller through dual Ethernet connections. Its output interface uses a DC-62 pin connector that mates directly with the associated terminal board.

Speed Monitoring and Trip Protection

The IS220PTURH1A handles four turbine speed sensor inputs. These inputs support speed monitoring for turbine control and overspeed protection. The acquired speed signals provide information for evaluating turbine operating conditions and executing primary trip functions.

In the TTURH1C configuration, the PTUR also handles bus and generator voltage inputs, shaft voltage and current signals, eight flame sensor inputs, and main breaker outputs. These functions depend on the terminal board configuration and should not be assumed to be available in every PTUR installation.

Communication and Hardware Architecture

The module has two 10/100Base-TX Ethernet ports for communication with the Mark VIe I/O networks. The dual-port arrangement supports connection to one or two Ethernet networks, depending on the system architecture.

Additional hardware features include:

• Processor board with flash memory and RAM.
• Turbine-specific control circuitry.
• Analog acquisition daughterboard.
• Front-panel LED indicators for visual diagnostics.
• Internal temperature monitoring and reset circuitry.
• Conformal-coated circuit boards.

Technical Specifications

Terminal Board Configuration

The terminal board determines which field signals and protection functions are available to the PTUR pack.

• TTURH1C: Provides the interface for four speed sensor inputs, voltage and shaft signal acquisition, flame detection, and main breaker outputs.
• TRPAH1A: An alternative arrangement that supports three PTUR packs directly. It provides primary trip relay functionality through two solid-state relays, with different signal capabilities from the TTURH1C arrangement.
• STUR: Simplex terminal board arrangements are also documented for PTUR applications.

The TRPAH1A arrangement does not support the bus and generator voltage inputs, shaft voltage and current signals, flame sensors, or main breaker outputs available in the TTURH1C configuration.

Frequently Asked Questions

Q: What is the primary function of the GE IS220PTURH1A?

A: It is a turbine-specific primary trip I/O pack for the Mark VIe control system. It acquires turbine protection signals, including speed inputs, and provides the electrical interface required for primary turbine protection functions.

Q: How many speed sensor inputs does the IS220PTURH1A support?

A: The module handles four speed sensor inputs. Their use and signal distribution depend on the associated terminal board arrangement.

Q: Can the IS220PTURH1A be used with a TRPAH1A terminal board?

A: Yes. GE documentation describes an arrangement using three PTUR packs directly with the TRPAH1A terminal board. However, this configuration has different signal capabilities from the TTURH1C arrangement.