Description

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　　8540-645 Other Names:

TG Speed ​​Governor 8540-645

8540-645 Clockwise Screw Speed ​​Governor

Product Positioning and Series Affiliation

Model Affiliation: 8540-645 belongs to the WOODWARD 8516 series of mechanical hydraulic turbine speed governors. This series includes sub-models such as TG-13 and TG-17, and is widely used in industrial steam turbines, pumps, compressors, and power generation applications.

Core Features: As a mechanical hydraulic differential speed governor, it does not require constant speed operation and is suitable for API 611 standard steam turbines, supporting speed control of pumps, compressors, or generators.

Technical Specifications and Performance

Speed ​​Range: Typical setting range is 2400-4000 rpm (e.g., TG-17 model), with a rated speed reduction of 2° at 4035 rpm.

Drive and Output: The drive shaft rotates counterclockwise, with an output torque of 23.7 N·m (17.5 ft-lb). The maximum rotation angle of the output shaft is 40°, and the recommended rotation angle is 2/3 of the full stroke (no-load to full-load).

Structural Integration: Features a built-in ball joint assembly (for sensing speed) and oil pump (for generating control force) for the drive shaft. An integrated overspeed test device (OTSD) is included for ATEX explosion-proof areas. An independent oil source design enhances reliability.

Environmental Adaptability: Operating temperature range -40~+90℃, compatible with 22/30 turbine oil, net weight approximately 22kg, dimensions approximately 200×170×380mm.

Working Principle and Control Logic

Speed ​​Sensing and Adjustment: The actual turbine speed is sensed by the drive shaft rotation and compared with an internal setpoint. The hydraulic pump output force is used to adjust the speed control valve opening, controlling steam flow to stabilize the speed.

Speed ​​Droop Characteristics: Load distribution is achieved through speed doop characteristics when the load changes, avoiding power oscillations when multiple units are connected in parallel.

Self-Containing Design: No external power supply is required. Relying on the turbine’s own drive shaft and oil pump, high reliability is ensured. Suitable for power generation, marine, oil and gas, and other scenarios requiring continuous operation.

Application Scenarios and Functions:

Typical Applications: Controls small steam turbines (such as industrial steam turbines and turbine expanders), drives pumps, compressors, or generator sets, supporting load distribution and parallel operation of multiple units.

Function Expansion: Compatible with electronic controllers (such as the 505 series and 2301D). A current-pressure converter (CPC) can convert 4-20mA signals into hydraulic output, adapting to retrofit projects for older units.

Protection Mechanism: Built-in overspeed protection (e.g., ProTech®203 system), monitoring three independent speed signals to prevent damage to the prime mover due to overspeed; requires independent configuration of over-temperature/over-pressure shutdown device.

Case Reference: In the procurement of scientific research equipment at Inner Mongolia University, this model of governor was used in the steam turbine control system to ensure precise speed control of the experimental equipment.

Maintenance and Installation Points

Installation Requirements: Follow the installation manual (e.g., CH04042), ensure grounding and anti-static measures, and avoid contact between plastic/foam materials and electronic components; the drive linkage mechanism must be compatible with PG type actuators (e.g., PG-PL series).

Maintenance Notes: Regularly check oil pressure, oil quality, and mechanical wear; hydraulic oil replacement must meet seasonal requirements (No. 22 turbine oil in winter/No. 30 turbine oil in summer); the electronic controller must be protected from moisture and dust, and unauthorized disassembly should be avoided.

Troubleshooting: Refer to the 505 series controller manual to troubleshoot problems such as unstable speed and excessive load distribution difference; contact the supplier for professional commissioning if necessary.

Routine Inspection: Monitor sampling flow rate, pressure, laser intensity, and other parameters daily, and promptly handle alarms.

Weekly Maintenance: Check the oil pump and speed control valve sealing, clean the filter screen, calibrate the flow sensor, and ensure unobstructed oil circuits.

Monthly/Quarterly Maintenance: Calibrate the speed setpoint, clean the sampling pipeline, replace the filter membrane and seals, and prevent blockage and wear.

Annual Maintenance: Conduct a comprehensive inspection of the drive shaft, oil pump, and speed control valve; replace vulnerable parts; and perform system performance testing and calibration.

Summary: The WOODWARD 8540-645 mechanical-hydraulic turbine governor, with its precise speed control, high reliability, and adaptability, is the preferred solution for speed control of industrial steam turbines. Its integrated design, speed reduction characteristics, and explosion-proof certification enable it to perform exceptionally well in key areas such as power generation, chemical, and oil and gas industries. Combined with standardized maintenance procedures, it ensures long-term efficient operation of the equipment.

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