Shielding Detection Circuit for Transmission Line Safety
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Solution Overview
Problem
Existing power supply transmission lines with conducting shielding layers face reduced safety performance due to inability to detect electrical leakage and breakage effectively, leading to compromised safety when the shielding layer is damaged or leaking.
Innovation Solution
A shielding detection circuit that includes an electric leakage detection module, a breakage detection module, a switch module, and a control module, which communicates with the conducting shielding layer to detect electric leakage and breakage signals, and automatically switches off the transmission line when such issues are detected, enhancing safety by ensuring timely response to potential hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only an electric leakage detection module is used to detect shielding layer issues, then the detection circuit is simple, but the safety performance is greatly reduced when the conducting shielding layer is broken
Solution Approach 1:
The detection circuit is segmented into two independent detection modules: an electric leakage detection module that detects leakage current, and a breakage detection module that detects continuity breaks in the shielding layer. Each module operates independently but feeds into the same control system, ensuring comprehensive detection coverage without requiring a single complex system to handle both failure modes.
Solution Approach 2:
The control module serves multiple functions: it receives signals from both the electric leakage detection module and the breakage detection module, processes both types of signals, and controls the switch module to disconnect the power supply bus in response to either condition. This multi-functional approach consolidates control logic while maintaining comprehensive safety monitoring.
2Reliability
If the electric leakage detection module is connected only to the conducting shielding layer, then the circuit is simple, but the electric leakage signal cannot be transmitted to the connection point when the shielding layer is broken
Solution Approach 1:
The breakage detection module acts as an intermediary that monitors the continuity of the conducting shielding layer independently. When the shielding layer is broken, this module detects the discontinuity and triggers the control module to disconnect the power supply, ensuring that the electric leakage detection module can still function properly even when the shielding layer is compromised.
Solution Approach 2:
The breakage detection module performs preliminary detection of the shielding layer continuity before electric leakage can occur or propagate. By continuously monitoring the integrity of the conducting shielding layer, the system can preemptively disconnect the power supply when a break is detected, preventing potential hazards from developing.
3Speed
If the switch module is controlled to turn off only upon electric leakage detection, then the response is simple, but the transmission line cannot be turned off in time when the conducting shielding layer is broken
Solution Approach 1:
The control logic for both electric leakage detection and breakage detection is merged into a single control module that processes both input signals and controls the same switch module. This unified control approach ensures that either detection condition can independently trigger the disconnection of the power supply bus, achieving fast response without requiring separate control circuits for each detection function.
Data Source
AI summary
Disclosed are a shielding detection circuit of a transmission line and a transmission line system. The shielding detection circuit of the transmission line includes an electric leakage detection module, a breakage detection module, a switch module and a control module, and a detection end of the electric leakage detection module is connected with a conducting shielding layer set to detect an electric leakage signal. The breakage detection module includes a first detection end and a second detection end. The first detection end of the breakage detection module is connected with one end of the conducting shielding layer set and the second detection end of the breakage detection module is connected with the other end of the conducting shielding layer set to detect a breakage signal. The switch module is connected with a power supply bus set to switch an on-off state of a transmission line of the power supply bus set.