Mobile Generator Protective Device for DC Tool Safety
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Solution Overview
Problem
Existing mobile generators for direct current tools, used in harsh environments, face issues with mechanical wear, cable damage, and unacceptably high voltage buildup due to short-circuits and insulation failures, leading to potential flashovers and damage to electronic components.
Innovation Solution
A protective device with a gas-filled insulating spark gap is introduced between live wires and ground, which responds to errors with a defined response voltage, coupled with an indicator device and switch-off means to manage overload and reclosing, ensuring the system is transferred to a safe state and preventing component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the generator operates in harsh environments with magnetic plates, then productivity is improved, but the reliability of the generator and cabling deteriorates due to mechanical wear and damage
Solution Approach 1:
The patent implements protective devices including fuses, circuit breakers, and insulation monitoring devices that are pre-installed in the generator system. These protective elements are positioned in advance to detect and respond to mechanical damage, cable tears, or insulation failures before they cause catastrophic failure, thereby maintaining reliability while allowing continuous operation in harsh environments
2Reliability
If the cabling is made more protected from mechanical destruction, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical protective structures with electrical protection systems. Instead of using heavy armored cables or complex mechanical shields, the invention uses fuses, circuit breakers, and insulation monitoring devices that detect cable damage electrically and automatically disconnect the circuit, providing reliable protection with minimal added complexity
3Reliability
If insulation monitoring is implemented to detect high voltage between live wires and ground, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulation monitoring device automatically continuously monitors the insulation resistance between live wires and ground/PE without requiring external intervention. The system self-detects insulation failures, generates alarms, and can automatically switch off the generator when dangerous voltage levels are detected, providing reliable overvoltage protection through autonomous operation
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 solution effectively limits hazardous voltage and prevents component damage by switching off the generator and controlling reclosure, maintaining system integrity even with repeated errors and varying operating conditions.
Implementation Method 1
A protective device with a gas-filled insulating spark gap is introduced between live wires and ground, which responds to errors with a defined response voltage
Data Source
AI summary
A mobile generator for generating a direct voltage for a tool supplied with direct current includes an alternating-voltage generator (1), an electronic control unit (3), a rectifier unit (2), which has a direct-voltage output (6) with live conductors (9, 10) for connecting the tool (11), and a protective device (14). The protective device is between the live conductors (9, 10) and a protective potential (18), especially ground or a protective wire. The protective device (14) has an insulating spark gap (15) responding in the case of an error with a defined response voltage (UT) for grounding the live conductors (9, 10).