IC3600SOTH1J - Over Temperature Relay Card

SPECIFICATIONS

Part Number: IC3600SOTH1J
Manufacturer: GE Fanuc
Country of Manufacture: United States(USA)
Availability: In Stock
Product Type: Over Temperature Relay Card (SCB)

Functional Description

IC3600SOTH1J is an Over Temperature Relay Card manufactured by GE Fanuc. It is a part of Mark I and II used in gas turbine control systems. The card is primarily responsible for monitoring temperature conditions in the turbine system and activating protective measures when temperatures exceed safe operational thresholds. It plays a crucial role in preventing equipment damage due to overheating by triggering alarms, system shutdowns, or control interventions based on preset limits.

System Temperature Loop Features

• One of the primary control loops in a gas turbine system is the temperature loop, which is designed to regulate both start-up and operating temperatures to ensure safe operation.
• Rather than directly measuring turbine inlet temperature, the system uses exhaust temperature as the key control parameter. While turbine inlet temperature is critical—especially near the stationary nozzles and first-stage turbine buckets—monitoring exhaust temperature offers several practical advantages.
• Components like inter-stage passages and exhaust ducting, often made from low alloy steel, have defined temperature limits. Additionally, exhaust temperature monitoring supports long sensor life, ease of sampling, serviceability, and reliability, making it the preferred method over direct turbine inlet measurements.
• Through carefully calibrated component gains and biases, the system ensures that while it actively controls exhaust temperature, it also indirectly keeps turbine inlet temperature within safe design limits.

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FREQUENTLY ASKED QUESTIONS

What is GE Fanuc IC3600SOTH1J?
It is an over-temperature relay card used in gas turbine control systems.

What is the purpose of the temperature loop in a gas turbine control system?
The temperature loop regulates the start-up and operating temperatures of the gas turbine to ensure they remain within safe limits, protecting the turbine and extending equipment life.

Why is exhaust temperature used instead of turbine inlet temperature?
Exhaust temperature is used because it allows for easier sampling, longer sensor life, and better serviceability. It also indirectly reflects turbine inlet temperature and helps maintain it within safe limits through system calibration.

Is turbine inlet temperature important for gas turbine operation?
Yes, turbine inlet temperature is critical, especially for components like first-stage nozzles and buckets. However, it's more difficult to measure directly, so the system uses exhaust temperature as a reliable alternative.