JSR000A I092-R - Controller Card

SPECIFICATIONS

Part Number: JSR000A I092-R
Manufacturer: General Electric
Series: Mark I and II
Product type: Controller Card
Repair: 3-5 days
Country of Manufacture: United States (USA)

Functional Description

JSR000A I092-R is an Controller Card developed by GE. It is a part of Mark I and II series. It handles critical signal processing tasks that are essential for the accurate operation of the turbine control system. It receives input signals from various sensors and components, processes these signals, and sends commands to other parts of the system, ensuring that the turbine operates within specified parameters.

System Startup Control

• During the startup process, the fuel flow to the turbine is controlled by a startup schedule. Both the speed control and the temperature control systems allow for higher fuel flows during this phase, with the minimum value gate selecting the startup schedule.
• In the initial phase of startup, the VCE (Valve Control Element) is held at zero to prevent fuel flow while the turbine accelerates to the required firing speed and purges the gas path. Once the firing speed is reached, the VCE is adjusted to the fire level. When ignition is detected by the flame detectors, the VCE is then lowered to the warmup value to prevent thermal shock to the hot-gas-path components.

Temperature Control

• The temperature control loop plays a crucial role in limiting fuel flow during startup and operation, especially when the maximum safe operating temperatures are approached. When the temperature limit becomes active, the control system adjusts fuel flow to maintain optimal temperature conditions. The turbine exhaust temperature is measured and compared with the setpoint temperature. The difference between these values is amplified, driving the fuel control to align with the setpoint temperature.
• The temperature setpoint is calculated by adjusting the exhaust temperature based on the compressor-discharge pressure, determining the allowable exhaust temperature for a constant firing temperature. This setpoint has an upper limit (around 1000°F) to protect the exhaust system hardware.
• The LM2500 turbine's temperature control system operates slightly differently, as it measures temperature between the gas generator and load turbines, imposing a constant temperature limit.
• For two-shaft turbine control systems, the temperature control system is implemented using analog electronic circuits. In contrast, single-shaft turbine control systems use a microprocessor-based system, known as the Integrated Temperature System (ITS), which handles the temperature control function. The ITS also supports other critical functions, including combustion monitoring, water injection control, and modulated Inlet Guide Vanes (IGV), as detailed in subsequent sections.

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FREQUENTLY ASKED QUESTIONS

What is JSR000A I092-R?
It is a Controller Card developed by GE.

How does the temperature control loop work during turbine startup?
During startup, the temperature control loop limits fuel flow to prevent the turbine from exceeding safe temperatures. It adjusts fuel based on the difference between the sensed exhaust temperature and the setpoint value, ensuring the turbine operates within optimal temperature limits.

What is the purpose of the VCE during startup?
The VCE (Valve Control Element) helps manage the flow of fuel during the turbine's startup phase. Initially, it is set to zero to prevent fuel flow until the turbine reaches firing speed. Once ignition is detected, the VCE is adjusted to maintain stable and safe operations.

How does the LM2500 turbine differ in its temperature control?
The LM2500 turbine uses a different temperature control approach, where the temperature is sensed between the gas generator and load turbines. A constant temperature limit is then applied to protect the system and maintain efficiency.

What is the Integrated Temperature System (ITS)?
The ITS is a microprocessor-based system used in single-shaft turbine control systems. It computes the temperature control alongside other functions, such as combustion monitoring, water injection, and adjusting the Inlet Guide Vanes (IGV) for optimized turbine performance.