Latching Magnet Test Device Preventing Actuator Separation
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Solution Overview
Problem
Existing methods for testing latching magnets in power circuit breakers, such as passing a low test current, are inadequate for reliably detecting wire breakages without causing unintended separation of contact elements.
Innovation Solution
A method and test device that briefly close the circuit to prevent actuator activation, using a current sensor and comparator to detect current flow through the winding, ensuring no separation occurs and allowing for fault detection within a short time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low test current is passed through the winding to test for wire breakage, then the testing can be performed, but the current may be insufficient to reliably detect wire breakages without causing unintended actuator separation
Solution Approach 1:
The patent replaces the mechanical/current-based testing method with an optical measurement system. A light source and light receiver detect changes in light transmission caused by the plunger position, providing precise measurement of the magnetic field strength without causing actuator separation. This optical substitution enables reliable wire breakage detection while maintaining measurement precision.
2Measurement precision
If a sufficient current is passed through the winding to reliably detect wire breakages, then detection accuracy improves, but the actuator may be triggered causing unintended separation of contact elements
Solution Approach 1:
The patent substitutes the harmful electrical current with a harmless optical measurement system. The light source and receiver detect plunger position changes optically, eliminating the risk of actuator activation while maintaining high detection accuracy for wire breakages.
Solution Approach 2:
The patent introduces an optical intermediary system (light source and light receiver) that mediates between the testing requirement and the actuator. This intermediary enables detection of wire breakages through optical signals rather than electrical current, preventing unintended actuator activation.
3Use of energy by moving object
If the circuit is closed for a longer time to allow complete discharge, then the magnetic field builds up sufficiently for testing, but the actuator separates and contact elements open
Solution Approach 1:
The patent replaces the time-dependent electrical discharge process with an immediate optical detection system. The light-based measurement can detect plunger position changes instantly without requiring complete capacitor discharge, thereby eliminating the need for extended circuit closing time while maintaining testing effectiveness.
4Object-affected harmful factors
If the circuit is closed quickly for testing, then actuator separation is prevented, but insufficient time is provided for complete capacitor discharge and magnetic field buildup
Solution Approach 1:
The patent substitutes the energy-dependent magnetic field buildup process with an optical detection system that does not require complete capacitor discharge. The light source and receiver can immediately detect plunger position changes, enabling rapid testing while preventing actuator separation.
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
Effectively tests the latching magnet for wire breakages without triggering actuator separation, providing a reliable and efficient means to assess winding integrity.
Implementation Method 1
a current sensor and comparator to detect current flow through the winding
Implementation Method 2
a current sensor and comparator to detect current flow through the winding
Implementation Method 3
the plunger is attracted, counter to the force of a spring, by the magnetic field of the permanent magnet
Implementation Method 4
a permanent magnet, a winding and a ferromagnetic plunger
Implementation Method 5
The tripping takes place by virtue of an opposing magnetic field being generated by the winding arranged on the permanent magnet, which opposing magnetic field compensates for the magnetic field of the permanent magnet
Implementation Method 6
an opposing magnetic field being generated by the winding
Data Source
AI summary
A method is disclosed for testing a latching magnet of a switch including a switching contact, formed from contact elements mechanically separated from one another for opening the switching contact; an electronic trip unit, to monitor current flowing via the contact elements and to perform a test for a current-dependent trip condition; an electrical energy store, forming a circuit with the winding of the latching magnet, the circuit being closed for a first closing time when the trip condition of the trip unit is met; and an actuator, actuable by closing off the circuit and configured to separate the contact elements. For test purposes, the circuit is closed for a second closing time, which is so short that separation of the contact elements by the actuator does not take place. A test is then performed to ascertain whether there is a current flowing via the winding of the latching magnet.