Disconnecting Switch Arm Position Sensing Using Time-of-Flight
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Solution Overview
Problem
Current methods for monitoring the position of high voltage disconnecting switches in substations face challenges such as mechanical failure modes, sensitivity to environmental conditions, and interference from electric and magnetic fields, which hinder accurate predictive maintenance and grid stability.
Innovation Solution
A system utilizing a time of flight sensor to determine the distance between the sensor and the movable arm of the high voltage disconnecting switch, allowing for accurate determination of the switch's open or closed state, and potentially intermediate states, while being resistant to environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If image recognition methods are used to monitor switch status, then automation degree is improved, but sensitivity to weather conditions and magnetic fields increases
Solution Approach 1:
The patent replaces optical/image recognition methods with a magnetic field-based sensing system. Instead of using cameras and image processing algorithms that are sensitive to weather and magnetic interference, the invention employs magnetic sensors (such as Hall effect sensors) to detect the position of the movable arm through its magnetic field signature, thereby substituting an optical system with a magnetic sensing system that is immune to weather conditions.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the movable arm and the sensing system. The movable arm carries a magnet or magnetic element, and the sensor detects changes in the magnetic field as the arm moves between open and closed positions. This magnetic field intermediary allows for contactless, weather-resistant position detection without direct optical or mechanical contact.
2Measurement precision
If optical sensors are used for position detection, then measurement precision is improved, but reliability under high magnetic fields deteriorates
Solution Approach 1:
The patent replaces optical sensing components (cameras, optical encoders) with magnetic sensing components (Hall effect sensors, magnetoresistive sensors). These magnetic sensors are specifically chosen because they can operate reliably in high magnetic field environments such as substations, where optical sensors would be interfered with by the strong ambient magnetic fields and could give erroneous readings or fail completely.
Solution Approach 2:
The patent changes the detection parameter from optical properties (light reflection, image features) to magnetic field properties (magnetic flux density, field direction). By measuring the magnetic field parameters instead of optical parameters, the system achieves both precise position detection and immunity to the high magnetic field environment, as magnetic sensors can be calibrated to distinguish between the sensor's own magnetic field and the ambient substation magnetic field.
3Device complexity
If mechanical position indicators are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces mechanical position indicators (such as physical flags, contact-based switches, or mechanical linkages) with a non-contact magnetic sensing system. The sensor detects the position of the movable arm by measuring the magnetic field strength or direction at different positions, eliminating the need for complex mechanical indicator mechanisms while achieving higher measurement precision through electronic detection.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary that carries position information from the movable arm to the sensor without requiring mechanical contact or complex mechanical transmission mechanisms. This allows for simple sensor placement and direct digital readout of position, reducing mechanical complexity while improving precision through electronic measurement capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and precise monitoring of the switch's position, reducing the risk of mechanical failures and improving predictive maintenance, thus enhancing grid stability and compatibility with high electric and magnetic fields.
Implementation Method 1
a time of flight sensor configured to determine a distance value indicating a distance between the time of flight sensor and the movable arm
Data Source
AI summary
The present disclosure relates to a system for determining a position of a movable arm of a high voltage disconnecting switch. The system comprises a high voltage disconnecting switch with a movable arm for opening and closing the high voltage disconnecting switch and a time of flight sensor configured to determine a distance value indicating a distance between the time of flight sensor and the movable arm. The system further comprises a control device configured to determine, based on the distance value, whether the high voltage disconnecting switch is in an open state or in a closed state. Further, a method for determining a position of a movable arm of a high voltage disconnecting switch is provided.