Electric Fence Grounding Relay for Residual Voltage Discharge
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Solution Overview
Problem
Existing electric fences with floating voltage pose safety risks when shut off, as they can induce electric shocks due to residual voltage.
Innovation Solution
An electric fence system incorporating a grounding device with isolation relays and a detection circuit that grounds the fence when power is off, using switches that transition from open to closed positions based on coil de-energization to connect terminals to ground, ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric fence uses floating voltage operation without grounding, then the fence can maintain high voltage pulses for effective deterrence, but safety risks arise when the fence is shut off due to residual floating voltage that can still induce electric shocks
Solution Approach 1:
The grounding device is configured to automatically ground the electric fence when power is shut off, before any potential contact by users. The detection circuit monitors the power state and activates the grounding relays in advance, ensuring residual floating voltage is discharged through ground connections before the fence becomes safe for contact.
Solution Approach 2:
Isolation relays serve as intermediary components between the high-voltage fence circuit and the ground. These relays provide controlled connection paths that allow safe discharge of floating voltage to ground when needed, while maintaining electrical isolation during normal operation. The relays act as mediators that enable grounding only under specific conditions.
2Reliability
If isolation relays are used to ground the fence when off, then safety is improved by eliminating floating voltage, but the device complexity and number of components increases
Solution Approach 1:
The grounding function is segmented into multiple independent isolation relays, each handling specific terminals (positive and negative). This segmentation allows the system to ground different parts of the circuit independently and systematically, ensuring complete discharge of floating voltage while maintaining organized and manageable circuit architecture.
Solution Approach 2:
The system changes the electrical state parameter of the fence from floating (high impedance) to grounded (low impedance) by controlling the switch state of isolation relays. When power is off, the relays transition from open to closed position, changing the impedance parameter to enable voltage discharge to ground.
3Reliability
If the grounding device automatically grounds the fence when power is off, then safety is ensured by eliminating residual voltage, but the detection circuit and control mechanisms add complexity
Solution Approach 1:
The detection circuit continuously monitors the power supply state and provides feedback control to the isolation relays. When the circuit detects that power has been shut off, it automatically triggers the grounding sequence by activating the relays. This feedback mechanism ensures the grounding action occurs precisely when needed without manual intervention.
Solution Approach 2:
The grounding system is designed to be self-activating based on power state detection. The detection circuit automatically identifies when power is off and triggers the grounding relays without requiring external control or manual operation. The system serves itself by monitoring its own state and taking appropriate safety actions.
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
Effectively eliminates floating voltage on the electric fence, preventing electric shocks and ensuring safety by grounding the fence even during power outages or malfunctions.
Implementation Method 1
each isolation relay includes a coil and a switch, wherein each switch is in an open position when the electric fence is on, and each switch is in a closed position when the electric fence is off
Data Source
AI summary
A disclosed electric fence system includes an electric fence; an energizer for generating a plurality of electric pulses applied to the electric fence; a detection circuit for monitoring a voltage of the electric fence; and a grounding device for grounding the electric fence when the electric fence is off. The grounding device is connected to the electric fence, the energizer, the detection circuit, and the ground.