Corona Wire Anomaly Detection via Secondary Current
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Solution Overview
Problem
Conventional particulate measurement systems face challenges in detecting anomalies in the electrical connection state of the corona cable and ion generation section without the need for expensive high-voltage detection apparatus, leading to increased production costs.
Innovation Solution
A particulate measurement apparatus with an isolation transformer, signal line, particulate computation section, corona discharge control section, and anomaly determination section, which determines anomalies based on secondary-side current behavior without directly detecting voltage at the corona cable or ion generation section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct voltage detection is used at the corona cable or ion generation section, then anomaly detection capability is improved, but production cost increases due to expensive high-voltage detection apparatus
Solution Approach 1:
The patent introduces a current detection mechanism as an intermediary to indirectly monitor the electrical connection state. Instead of directly detecting high voltage, the system detects current flow through the corona cable and ion generation section, which serves as a safe mediator that provides anomaly information without requiring expensive high-voltage detection equipment
Solution Approach 2:
The patent replaces the electrical voltage detection mechanism with a current-based detection system. By substituting direct voltage measurement (which requires high-voltage apparatus) with current measurement (which can be done with standard equipment), the system achieves anomaly detection capability while reducing production costs
2Measurement precision
If high-voltage detection apparatus is used, then voltage detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the detection function from the high-voltage environment and relocates it to a safe, low-voltage measurement point. By separating the detection mechanism from the high-voltage corona cable and ion generation section, the system achieves adequate measurement precision without requiring complex high-voltage detection apparatus
Solution Approach 2:
The patent creates a current-based copy of the voltage detection function. Instead of directly measuring voltage, the system measures current flow as a proxy indicator, which provides sufficient information about the electrical connection state without requiring sophisticated high-voltage measurement equipment
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 anomaly detection in the electrical connection state without expensive high-voltage detection, reducing production costs and improving determination accuracy by using secondary-side current behavior.
Implementation Method 1
The ion generation section generates ions by means of corona discharge
Implementation Method 2
The isolation transformer for corona discharge has a primary coil and a secondary coil and performs voltage conversion
Data Source
AI summary
In a particulate measurement apparatus (300) of a particulate measurement system (10), a control section (600) provisionally determines in an anomaly determination process at S130 that a corona core wire (202) is in a wire-breakage anomaly state; namely, that the corona core wire (202) is broken, when a corona low-side current C1 is equal to or smaller than a current determination value C1min, and increments a wire-breakage anomaly counter CNB at S140. The control section (600) determines that the corona core wire (202) is in the wire-breakage anomaly state at S170 when the count value of the wire-breakage anomaly counter CNB is equal to or greater than a wire-breakage determination threshold Cth; namely, that the result of the determination at S160 is “Yes”.