Pilot Interlock Contactor for Unexpected Start-Up Prevention
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Solution Overview
Problem
Existing safety devices for portable electric utilities are inadequate in emergency conditions and do not comply with safety regulations, particularly in situations involving magnetic induction and unexpected start-ups, and require multiple independent devices for individual functions.
Innovation Solution
A servo-controlled protection device with a pilot interlock circuit and power circuit, using a transformer and electromechanical relays, ensures safe activation and deactivation of the utility by manual reset, preventing unexpected start-ups and overcurrents through a disconnecting contactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnetic contactor is used for power supply control, then the utility can be activated, but unexpected start-ups may occur due to magnetic induction voltage when the utility is deactivated
Solution Approach 1:
The pilot circuit is activated in advance before the power circuit, establishing control conditions that prevent unexpected start-ups. The pilot circuit's relay retains its state to block unintended power activation, ensuring safety before the utility can be activated.
Solution Approach 2:
A pilot circuit with relay serves as an intermediary between the operator and the power circuit. This intermediate control layer prevents direct activation of the power circuit, blocking unexpected start-ups while still allowing intentional activation through the proper sequence.
2Reliability
If wired electrical interlocking circuits are used for emergency control, then emergency situations can be controlled, but the control device must follow the path of the utility making it inapplicable to mobile utilities
Solution Approach 1:
The protection device integrates multiple functions including emergency stop, pilot circuit control, and power circuit management into a single unit that can be attached to any utility. This universal design makes it applicable to both fixed and mobile utilities without requiring the control device to follow the utility's path.
3Reliability
If the utility is isolated from power supply in emergency conditions, then safety is improved, but multiple independent devices are required for individual functions increasing complexity
Solution Approach 1:
The invention merges the pilot circuit, power circuit, emergency stop functionality, and relay control into a single integrated protection device. This consolidation provides comprehensive safety functions while reducing the number of independent devices required, simplifying the overall system.
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 device provides reliable safety by isolating the utility from voltage and overcurrents, meeting regulatory standards with immediate shutdown and manual restart, using conventional components and reducing production costs.
Implementation Method 1
there is a low voltage generated by a magnetic induction
Data Source
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AI summary
Servo-controlled device for the protection of an electric current utility (Y3) of the type comprising a plug (14) for connection via electric cable to the device, an internal resistance (R2) and a switch (X2) to activate the utility, the device comprising: a first power circuit (Y2) arranged to be supplied upstream from the electricity grid (RE) and to supply the utility downstream (Y3) through a socket (13) that can be connected to the plug (14), including a disconnecting contactor (K) configured to be able to switch from a normal configuration of electrical disconnection of the utility (Y3) to a coupling and powered configuration; a second pilot interlock circuit (Y1) which, if powered, induces and maintains said contactor (K) in the coupling and powered supply state, only in response to a condition of closure of said switch (X2) of the utility, said contactor (K) returning to the electrical disconnection state in emergency conditions such as at least: a drop in the mains voltage, the extraction of the utility's plug from the socket and shearing of the utility's power cord.