IEC 61362:2024

Overview

IEC 61362:2024 is the latest international standard providing comprehensive guidelines for the specification of hydraulic turbine governing systems. Published by the International Electrotechnical Commission (IEC), this third edition supersedes the 2012 version, incorporating updated technical data, new control topics, and parts of IEC 60308 related to specification matters. The standard primarily focuses on the turbine governing level which is critical for ensuring optimal turbine performance, reliability, and safety. It aims to unify the selection of parameters for use in bidding specifications and technical offers, while also serving as a foundation for establishing technical guarantees.

This standard covers essential aspects such as speed, power, water level, opening, and flow control for both reaction and impulse turbines, including double regulated machines. It also addresses the methods of actuating energy supply and describes safety devices geared toward emergency shutdowns. IEC 61362:2024 assists stakeholders in developing consistent and efficient turbine control system specifications.

Key Topics

• Governing System Structure: Detailed explanations on main control functions covering speed, power output, water level, and flow (discharge) control. The standard explains configurations of combined controllers including parallel and series structures, as well as advanced functions like feedforward control and surge feedback.

• Control Techniques: Introduction of new technical topics related to control concepts including pump-turbine controls for conventional and variable speed applications, manual control, linearization, and bumpless control mode transitions to avoid operational disturbances.

• Functional Performance: Guidance on performance criteria including modeling and digital simulations of water passages, turbines, and generators. It emphasizes the use of hardware-in-the-loop simulations and personnel training to ensure trustworthy system evaluation.

• Instrumentation: Comprehensive information on instrumentation related to rotational speed, power output, water levels, actuator positions, and signal transmission to optimize feedback and control accuracy.

• Safety Devices: Coverage of critical safety mechanisms such as quick and emergency shutdown systems, overspeed protection, tripping strategies, and interlocks designed to protect hydraulic turbines under fault or emergency conditions.

• Actuating Energy Supply: Discusses systems with and without accumulators, including pressure tanks, piston and bladder accumulators, pumps, and auxiliary equipment. It also highlights recommendations for hydraulic fluid selection ensuring reliable actuation energy provision.

• Operational Transitions: Recommendations for start-up procedures, synchronization, normal shutdown, and sudden load rejection, addressing smooth control transitions to safeguard turbine operation.

• Supplementary Equipment: Measures and equipment for reducing pressure variations, surge control, lowering speed rise, and joint control techniques.

Applications

IEC 61362:2024 is an essential resource for engineers, designers, manufacturers, and operators involved in:

• Designing hydraulic turbine governing systems for both new installations and upgrades.
• Preparing consistent technical specifications and bids for turbine control system procurement.
• Establishing technical guarantees and acceptance criteria in contracts.
• Implementing control solutions for hydropower plants, including reaction and impulse turbines, as well as pump-turbine applications.
• Enhancing the safety and reliability of hydraulic turbine operations through appropriate emergency shutdown and safety device configurations.
• Supporting the training and simulation of control personnel using recommended simulation techniques.
• Facilitating integration with plant-level control systems and frequency control mechanisms at power grid interface points.

Related Standards

• IEC 60308 – Hydraulic turbine, pump turbine, and governor testing: This standard complements IEC 61362 by covering testing procedures, acceptance tests, and performance guarantees omitted here.

• IEC 60034 – Rotating electrical machines: Relevant for aspects involving generator control integrated with turbine governing.

• IEC 61850 – Communication networks and systems in substations: Useful for data communication between turbine governors and plant control systems.

• IEC 61131 – Programmable controllers: Applies to digital control systems employed in governing system automation.

Keywords

Hydraulic turbine, turbine governing systems, speed control, power output control, flow control, emergency shutdown, actuating energy, safety devices, hydraulic turbine specification, pump-turbine control, IEC standards, turbine control systems.

By following IEC 61362:2024, organizations can ensure standardized, safe, and effective control of hydraulic turbines to maximize operational performance, compliance, and grid stability.