Electromechanical Actuator for Circuit Breaker Time Delay
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Solution Overview
Problem
Hydromechanical stored-energy spring mechanisms in high-voltage switching systems are highly susceptible to temperature influences, ensuring constant time delay only within a narrow temperature range, making them unreliable for broader temperature variations.
Innovation Solution
An electromechanical actuator replaces the hydraulic operation of the CO delay circuit, providing a mechanical time delay or acceleration mechanism that interacts with an electrical drive and control unit to maintain consistent performance across an extended temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulically operated CO delay circuit is used, then the switching contact opening is controlled with a time delay, but the time delay becomes highly susceptible to temperature influences and only remains constant within a narrow temperature range
Solution Approach 1:
The patent replaces the hydraulic operation system with an electromechanical actuator that uses a motor-driven mechanism. The motor (22) drives a gear (23) which operates the delay circuit through purely mechanical means, eliminating temperature-sensitive hydraulic components while maintaining controlled time delay functionality across extended temperature ranges
Solution Approach 2:
The patent changes the operating parameters of the delay circuit by using an electromechanical system with a motor and gear mechanism instead of hydraulic operation. This parameter change allows the system to maintain constant time delay characteristics across a broader temperature range by eliminating thermal expansion and viscosity effects inherent in hydraulic systems
2Reliability
If a hydraulically operated CO delay circuit is used, then the switching process can be delayed, but the system becomes highly susceptible to temperature influences
Solution Approach 1:
The patent substitutes the hydraulic operation mechanism with an electromechanical actuator comprising a motor (22) and gear (23). This replacement eliminates the temperature susceptibility inherent in hydraulic systems while preserving the ability to control and delay the switching process through mechanical engagement with the delay circuit
3Manufacturing precision
If hydraulic operation is used for the CO delay circuit, then time delay control is achieved, but the temperature range for constant time delay is limited
Solution Approach 1:
The patent replaces hydraulic operation with an electromechanical actuator that uses a motor (22) driving a gear (23) to operate the delay circuit. This substitution achieves precise time delay control through mechanical transmission while extending the operating temperature range by eliminating temperature-sensitive hydraulic fluid properties
Solution Approach 2:
The patent changes the operational parameters from hydraulic to electromechanical, using motor speed and gear ratio control to achieve precise time delay. This parameter change enables consistent performance across broader temperature ranges by replacing temperature-dependent hydraulic parameters with electrically controlled mechanical parameters
Data Source
AI summary
A hydromechanical stored-energy spring mechanism is provided for operating at least one switching contact of a circuit breaker, for example, in a high-voltage switching system. The hydromechanical stored-energy spring mechanism includes a hydraulically operated close-open (CO) delay circuit configured to delay triggering of a switching process of the circuit breaker, and an electromechanical actuator provided in place of a hydraulic operation of the CO delay circuit. The electromechanical actuator generates a mechanical time delay or acceleration over an extended temperature range.