Isolation Transformer Shock Protection for Low-Voltage User Ends
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Solution Overview
Problem
Existing methods for low-voltage electric shock prevention in households and cultural tourism sites fail to effectively eliminate electric shock feelings and potential dangers, especially when insulation of live wires is compromised, as they rely on capacitance distribution and capacitive reactance, which can lead to varying shock currents and voltages.
Innovation Solution
An anti-electric-shock monitoring and protection apparatus using an isolation transformer, voltage sensors, current sensors, a microprocessor, electronic switches, and a circuit breaker to quickly identify and discharge the shock wire, ensuring safety by short-circuiting the wire to ground or tripping the circuit breaker based on voltage and current polarity and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing monitoring devices are used, then monitoring function is provided, but device complexity and cost increase
Solution Approach 1:
The patent combines the electric-shock monitoring function with the existing power supply module by integrating a monitoring unit into the power supply circuit. The monitoring unit shares the power supply's working state detection capabilities and communicates with the control unit through existing communication interfaces, thereby providing monitoring functionality without adding independent monitoring hardware.
Solution Approach 2:
The power supply module is designed to perform multiple functions: it not only provides power supply but also monitors working state, detects electric-shock conditions, and communicates control information. The control unit receives both power supply signals and monitoring signals, enabling one device to serve multiple purposes and eliminate the need for separate monitoring equipment.
2Reliability
If existing monitoring devices are used, then monitoring function is provided, but cost increases
Solution Approach 1:
The patent combines the electric-shock monitoring function with the existing power supply module by integrating a monitoring unit into the power supply circuit. The monitoring unit shares the power supply's working state detection capabilities and communicates with the control unit through existing communication interfaces, thereby providing monitoring functionality without adding independent monitoring hardware.
Solution Approach 2:
The power supply module is designed to perform multiple functions: it not only provides power supply but also monitors working state, detects electric-shock conditions, and communicates control information. The control unit receives both power supply signals and monitoring signals, enabling one device to serve multiple purposes and eliminate the need for separate monitoring equipment.
3Measurement precision
If complex monitoring systems are deployed, then monitoring precision improves, but response time increases
Solution Approach 1:
The monitoring unit continuously monitors the power supply voltage and current in real-time, maintaining readiness to detect electric-shock conditions. The system performs preliminary detection of abnormal voltage changes before actual electric-shock damage occurs, enabling immediate response when shock conditions are detected without requiring complex analysis procedures.
Solution Approach 2:
The monitoring unit provides real-time feedback to the control unit about power supply status and detected electric-shock conditions. When abnormal voltage changes indicating electric-shock are detected, the monitoring unit immediately signals the control unit, which then triggers the protection mechanism. This closed-loop feedback ensures rapid response while maintaining detection accuracy through continuous monitoring.
Data Source
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Figure 3
Figure 4~5
AI summary
Disclosed are an anti-electric-shock monitoring and protection method and apparatus for a low-voltage user end, wherein same can monitor a power supply line that passes through an isolation transformer (1) and can protect a human body when the human body encounters an electric shock. Voltages to the ground and electric shock currents of two power supply wires (A, B) are measured by means of voltage and current sensors (2-5), the position of an electric shock is located, the wires constituting an electric shock loop are identified, and the type of the electric shock is determined, thus, a microprocessor (6) outputs a corresponding control signal, and electronic switches (S1, S2) act in a timely manner, such that the wires (A, B) where the electric shock occurs are short-circuited to the ground. By means of the method and apparatus, protection against a single-wire electric shock can be realized, and the threat of a double-wire electric shock can also be solved; and the duration of a whole action is less than 10ms, such that the threat of an electric shock is solved when a human body encounters an electric shock but before any harm has been done to the human body, thereby protecting a person's safety. In addition, compared with other apparatuses protecting against an electric shock, in the method and apparatus, a power source does not need to be cut off upon a single-wire electric shock, such that supplying of power can still be continued while the safety of a human body is protected, thereby ensuring the continuity of power supply.