Short-Circuit Test Device for Single-Phase Circuit Breakers
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Solution Overview
Problem
Existing devices for detecting residual short-circuits in electrical installations before energization either consume additional energy, compromise insulation safety, or are not suitable for single-phase circuit breakers, leading to reliability issues and accelerated wear of protection devices.
Innovation Solution
A short-circuit test device that connects to a single power line conductor, using a control unit and test means to analyze current parameters without requiring a connection to both phase and neutral, allowing for detection of short-circuit faults without altering the line protection apparatus or consuming additional energy, and is integrated into a protection device or used as an auxiliary component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing devices for detecting residual short-circuits are used, then short-circuit detection capability is improved, but energy consumption increases and insulation safety is compromised
Solution Approach 1:
The test device is activated periodically or on-demand rather than continuously. The switch means allows the device to be triggered only when needed (e.g., before energization after maintenance), enabling short-circuit detection without permanent connection to phase and neutral, thus avoiding continuous energy consumption while maintaining detection capability when required
Solution Approach 2:
The invention extracts the essential detection function from the permanent connected electronic circuits of prior art. By using a portable test device that connects only when needed, it separates the detection function from the continuous power system, eliminating the need for permanent phase-neutral connections and associated energy consumption
2Measurement precision
If existing devices for detecting residual short-circuits are used, then short-circuit detection capability is improved, but insulation safety deteriorates
Solution Approach 1:
The invention removes the test device from permanent installation within the protected circuit. By using a portable device that connects temporarily to a single conductor, it eliminates the risk of creating permanent insulation pathways or compromising the protection apparatus, while still enabling detection when needed
Solution Approach 2:
The test device acts as an intermediary tool rather than a permanent component. It interfaces with the circuit only during testing through a single conductor connection, avoiding direct permanent integration that could affect insulation safety, while still providing the necessary detection function
3Measurement precision
If existing devices for detecting residual short-circuits are used, then detection function is improved, but device complexity and reliability issues increase
Solution Approach 1:
The invention separates the detection function into a standalone portable test device rather than integrating it into the circuit breaker. This segmentation allows the protection device to remain simple and reliable while the detection function is performed by a separate tool that does not modify the original protection apparatus
Solution Approach 2:
The test device is self-contained with its own power source and processing unit, requiring no modification to the circuit breaker or protection device. It performs all detection functions independently, maintaining the simplicity and reliability of the original protection apparatus while adding detection capability
4Measurement precision
If existing devices for detecting residual short-circuits are used, then detection capability is improved, but adaptability to single-phase lines is reduced
Solution Approach 1:
The test device is designed with universal applicability to both single-phase and three-phase systems. By connecting to a single conductor and using a portable design with its own power source, it can be applied to any circuit type without requiring specific phase-neutral connections, making it versatile across different electrical systems
Data Source
Figure 1A~2C
Figure 3~4
AI summary
The invention relates to a device in which, in order to detect the presence of a short-circuit prior to tripping a circuit breaker (3), an auxiliary circuit (20) is connected in series to the phase of an electric line (1) connected to a circuit breaker (3). Manual actuation sequentially powers the circuit and tests the line. The device (10), as an individual element (30) or built into the circuit breaker (40), does not consume any power except when actuated for the test; since the device is isolated from the main circuit, it does not cause any galvanic loss.