Portable PV Ground Fault Detection Using Hall-Effect Current Probes
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Solution Overview
Problem
Existing methods for detecting and locating ground faults in photovoltaic power generation installations are costly, risky, and inefficient, often requiring disconnection of multiple poles under voltage, which is time-consuming and poses safety hazards, especially when faults occur on moving structures like trackers.
Innovation Solution
A portable equipment with clamp ammeters, direct current probes, and a control unit that instantaneously detects and locates ground faults by measuring fault current circulation without disconnecting circuits, using on-load breaking capacity to isolate the faulted pole and Hall effect transformers for redundancy, enabling safe and rapid fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage measurement equipment (multimeters) is used to detect ground faults by disconnecting poles one by one, then the fault location can be identified, but the process requires working under voltage which poses safety hazards and consumes significant time
Solution Approach 1:
The patent introduces a ground fault detector with a test circuit that acts as an intermediary device. This detector temporarily connects to the ground system through a switchable connection, allowing fault detection without requiring technicians to work directly on live circuits. The intermediary device handles the dangerous voltage exposure while operators safely observe readings from the detector's display.
Solution Approach 2:
The patent replaces the manual mechanical process of disconnecting poles one by one with an automated electronic detection system. The ground fault detector uses electronic switching and measurement circuits to automatically identify faulty poles, eliminating the need for manual disconnection operations and reducing exposure to electrical hazards.
2Measurement precision
If manual disconnection of multiple poles is performed to locate ground faults, then the faulty pole can be identified, but the process is time-consuming and reduces productivity
Solution Approach 1:
The patent implements preliminary action by pre-configuring the ground fault detector with all necessary measurement circuits and switching mechanisms before deployment. The device is prepared in advance to simultaneously or sequentially test multiple poles without requiring manual reconfiguration during the detection process, significantly reducing the time needed to identify faulty poles.
Solution Approach 2:
The patent employs periodic action through automated sequential testing of multiple poles. The detector systematically cycles through each pole in a predetermined sequence, performing measurements at regular intervals until all poles are tested or a fault is detected, enabling rapid comprehensive inspection without manual intervention for each pole.
3Productivity
If ground fault detection is performed during daylight hours with solar radiation, then the installation can continue generating power, but the fault location process becomes more complex and time-consuming
Solution Approach 1:
The patent extracts the ground fault detection function as a separate, independent operation from the power generation process. The ground fault detector operates as an independent device that can be activated without interrupting normal power generation, allowing fault detection to be performed as a distinct task that does not interfere with ongoing solar energy production.
Solution Approach 2:
The patent enables continuity of useful action by allowing the photovoltaic installation to continue generating power while the ground fault detector performs its measurements. The detection process is designed to be non-intrusive, maintaining uninterrupted power generation throughout the detection procedure and eliminating the need to shut down the system for inspection.
4Ease of operation
If clamp ammeters and on-load breaking capacity equipment are used to detect fault current circulation, then safe and rapid fault detection is enabled without disconnecting circuits, but the equipment complexity increases
Solution Approach 1:
The patent applies universality by designing the ground fault detector to perform multiple functions within a single integrated device. The equipment combines current measurement capabilities, ground fault detection, pole identification, and safety switching mechanisms, eliminating the need for multiple separate instruments and reducing overall system complexity despite the advanced capabilities.
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
Enables rapid, safe, and cost-effective detection and location of ground faults, reducing downtime and increasing power generation efficiency by minimizing manual disconnection and risk, while allowing operation during daylight hours.
Implementation Method 1
detect through which of them said fault current circulates
Implementation Method 2
through the equipment, one or two (to seek redundancy and increase safety) direct current measurement transformers (normally Hall effect transformers) will be installed which, upon detecting that this failure or fault current is circulating
Data Source
Figure 1~2
AI summary
The present invention relates to equipment for detecting ground failures or faults in electric power generation installations with photovoltaic modules, comprising: external (1) and internal (2) connection elements with the capacity to restore the electric current as a result of the fault, and with on-load breaking capacity, able to be detachably connected with connectors of the photovoltaic modules, a series of electric direct current probes (3) based on the Hall effect to detect the electric pole or cable through which said current circulates, said probes exhibiting a jaw opening for embracing the poles or conductors of the photovoltaic modules, electric protection elements (4), measurement elements (5), a communication module (6), a control unit (7), wherein all the aforementioned elements, except for the direct current probes (3) and the external connection elements (1), can be housed inside a transportable suitcase (10).