Introduction
The designation 3500/65-01-00 172103-01 refers to a TMR (Triple Modular Redundant) Speed Input Module and its associated TMR Speed Sensor for the Bently Nevada 3500 Machinery Protection System. This is a high-integrity system designed for critical overspeed protection applications where maximum reliability and fault tolerance are required. The module accepts three independent speed signals from the magnetic sensor (172103-01), processes them through three separate channels, and uses a voting mechanism to determine a single, highly reliable speed value. This architecture ensures continued operation even if one channel fails, making it essential for protecting turbines and other high-speed machinery from catastrophic overspeed events.
Parameters / Specifications
The following table outlines the key technical parameters for this TMR Speed Monitoring System.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/65-01-00 (Module) & 172103-01 (Sensor) |
| Description | TMR (Triple Modular Redundant) Speed Monitoring System |
| Module: 3500/65-01-00 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Module) | Approx. 0.5 kg (1.1 lb) |
| Input Channels | 3 independent magnetic speed sensor inputs |
| Redundancy | Triple Modular Redundant (TMR) architecture |
| Power Supply | Powered by the redundant 3500 rack power supplies |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Sensor: 172103-01 | |
| Sensor Type | Passive Magnetic Speed (Variable Reluctance) Sensor |
| Physical Dimensions | Approx. 96 mm (3.78 in) overall length. Thread: 5/8-18 UNF. |
| Weight (Sensor) | Approx. 0.25 kg (0.55 lb) |
| Output Signal | AC Sine Wave (self-generating) |
| Supply Voltage | Not Required |
| Operating Temperature | -40°C to +120°C (-40°F to +250°F) [Standard] |
| Compatibility | Bently Nevada 3500 Series Rack with TMR-capable firmware. |
Note: This system is part of a Safety Instrumented System (SIS). The installation, calibration, and validation must be performed in strict accordance with the manufacturer's safety manual and relevant industry standards (e.g., IEC 61508, IEC 61511).
Application Scenarios
This TMR system is deployed in the most critical overspeed protection applications where system failure is not an option.
Gas & Steam Turbine Overspeed Protection:
The primary application is as the main overspeed protection system (OS) for industrial gas turbines and steam turbines. Its TMR architecture provides the necessary Safety Integrity Level (SIL 2 or SIL 3) to prevent catastrophic turbine disintegration.
Critical Compressor Overspeed Protection:
Used on high-energy centrifugal compressors in the oil & gas, and petrochemical industries where an overspeed event could lead to a severe incident, ensuring a highly reliable trip signal.
Aero-Derivative Turbine Control:
Commonly specified for aero-derivative gas turbines used in power generation and mechanical drive applications, which require the highest levels of reliability and fault tolerance in their control and safety systems.
Nuclear Power Plant Safety Systems:
Applied in safety-related systems within nuclear power plants where redundant and fault-tolerant design is mandated for components protecting nuclear safety.
Other Safety-Instrumented Functions (SIF):
Can be used for any critical rotating machinery where a single point of failure in the speed detection system is unacceptable and a documented, high-integrity safety function is required.
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