Blade Closing Detector for High Voltage Switches
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Solution Overview
Problem
High voltage electric power disconnect switches face challenges in reliably detecting proper blade engagement due to ice accumulation and mechanical malfunctions, leading to arcing and potential damage, as existing detectors rely on visual inspection of the switch linkage, which is difficult and prone to false indications.
Innovation Solution
A blade closing detector system using gravity switches, magnetic pickups, sliding latches, and visual indicators to distinguish between proper engagement and proximity, with optional remote communication, ensuring accurate detection of blade engagement within jaws and preventing false indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If visual inspection of the vertical pipe linkage is used to detect blade engagement, then the detection method is simple, but the reliability of detection is low due to difficulty in viewing and false indications
Solution Approach 1:
The patent replaces the mechanical visual inspection system with an optical detection system using a laser beam and sensor. The laser beam projects a visible reference line, and the sensor automatically detects blade position relative to this reference, eliminating the need for technicians to visually inspect distant linkage components.
Solution Approach 2:
The patent introduces a laser beam as an intermediary between the blade and the detection sensor. The laser provides a visible reference line that mediates the detection process, making the blade's position and engagement status clearly visible and measurable without direct visual inspection of the mechanical linkage.
2Reliability
If the blade arm is allowed to rotate into engagement to form a tight interference fit, then the electrical connection quality is improved, but the risk of arcing increases when ice accumulation prevents proper engagement
Solution Approach 1:
The patent performs preliminary detection of blade engagement status before the blade completes its rotation and engagement. By detecting the blade's position relative to the laser reference line during the engagement process, the system can identify potential engagement failures due to ice accumulation before arcing occurs.
Solution Approach 2:
The patent implements a feedback system where the sensor continuously monitors the blade's position relative to the laser reference line and provides real-time information about engagement status. This feedback allows for immediate detection of improper engagement conditions, enabling corrective action before arcing damage occurs.
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
The detector system provides a reliable and visible indication of proper blade engagement, reducing the risk of arcing and damage by accurately distinguishing between proper and improper engagement, even in adverse weather conditions, and allows for remote monitoring of switch status.
Implementation Method 1
A first type of detector uses a gravity switch and a magnetic pickup to detect proper engagement between the blade and the switch
Data Source
AI summary
A blade closing detector for an electric power switch includes a blade closing detector and an electronic or visual indicator. A first type of detector uses a gravity switch and a magnetic pickup to detect proper engagement between the blade and the switch. A second type of detector uses a sliding latch with a visual indicator rod to provide a visual indication of proper engagement of the blade within the jaws. A third type of detector uses a magnetic switch with a pivot arm and a dome shaped visual indicator. These detectors may be deployed individually or in combination and may be augmented with communication equipment to transmit switch status to a remote location. It will be understood that specific embodiments may include a variety of features in different combinations, as desired by different users.