Ground Terminal Block Fault Indicator with Capacitor
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Solution Overview
Problem
Traditional ground terminal blocks cannot indicate ground fault current, making it difficult to locate the source of the fault when power is out, leading to increased time and cost for professionals and novice electricians to resolve the issue.
Innovation Solution
A ground terminal block equipped with a LED that ignites when a ground fault is detected and remains lit after power loss, along with an optional signal sound, to identify the faulty block, ensuring only the affected terminal block is indicated, facilitating easier fault source identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional ground terminal blocks are used, then ground connection is accessible and wiring is simplified, but ground fault current cannot be indicated when power is out
Solution Approach 1:
The patent applies preliminary action by installing a capacitor-connected LED indicator in the ground terminal block before fault occurrence. The capacitor charges during normal operation and automatically discharges to light the LED when power fails and ground fault occurs, enabling fault indication before the electrician arrives on site.
Solution Approach 2:
The patent uses an intermediary approach by introducing a capacitor as an energy storage medium between the ground circuit and the LED indicator. This capacitor acts as a mediator that accumulates energy during normal operation and releases it to power the LED during fault conditions, enabling the indicator function without continuous power supply.
2Difficulty of detecting and measuring
If LED indicators are added to terminal blocks, then fault detection capability is improved, but the LED will not light when power is out
Solution Approach 1:
The capacitor is pre-charged during normal operation before fault occurs. When power loss and ground fault happen simultaneously, the pre-stored energy in the capacitor immediately powers the LED without requiring external power, ensuring reliable indication during the critical power loss period.
Solution Approach 2:
The ground terminal block becomes self-servicing by using its own ground fault current to trigger the indication. The capacitor automatically discharges through the LED when ground fault occurs, making the system self-indicating without needing external power sources or additional control circuits.
3Ease of operation
If ground fault indication is implemented, then fault source location becomes accessible, but device complexity increases
Solution Approach 1:
The patent applies segmentation by placing individual LED indicators on each ground terminal block rather than using a centralized indication system. This allows each block to independently indicate its own fault status, simplifying the overall system architecture and making fault location immediate and unambiguous without complex control wiring.
Solution Approach 2:
The patent uses inexpensive components (capacitor and LED) that can be easily replaced if needed. The simple capacitor-LED circuit is much cheaper and simpler than microcontroller-based solutions, maintaining low cost while providing reliable fault indication functionality.
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 allows for quicker and cost-effective identification of ground fault current sources by maintaining a signal light and optional sound alert, even after power loss, reducing fault finding time and expenses.
Implementation Method 1
The ground terminal block is installed with a signalling device, such as a light emitting diode (LED), which will light up when ground fault current occur.
Implementation Method 2
When a fault current flows through a single ground block from the upper connection of the ground block to the ground fault detection device, a LED is ignited indicating the ground fault
Data Source
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AI summary
An electrical ground terminal block assembly and arrangement to make ground fault situation accessible comprise a ground terminal housing (1) to hold the wire linking elements (5, 6) and a characterized ground fault indicating device (2). The ground terminal block based on the invention is comprised with signaling means (11) to indicate ground fault. Fault current is detected by the ground fault indicating device through upper linking element detection devise of said ground terminal block.