Tank-Type Circuit Breaker Discharge Detection via Low-Pass Filter Segmentation
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Solution Overview
Problem
Conventional vacuum degree monitoring devices and partial discharge detection systems cannot accurately distinguish between internal and external discharges in a tank-type circuit breaker, leading to potential misidentification of discharge locations and the need for high-performance, costly processing devices to calculate time differences.
Innovation Solution
A tank-type circuit breaker design incorporating first and second bushings with low-pass filters around central conductors to attenuate external discharge signals, an antenna within the tank to receive discharge signals, and a discharge detection unit for arithmetic processing to detect internal discharges, thereby differentiating between internal and external discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vacuum degree monitoring devices use antennas to detect discharge signals, then discharge detection capability is provided, but the devices cannot distinguish between internal and external discharges leading to misidentification
Solution Approach 1:
The patent divides the discharge detection function into two separate systems: one for detecting internal discharges (using the antenna inside the tank) and one for detecting external discharges (using the low-pass filter on the central conductor). This segmentation allows the system to distinguish between internal and external discharge sources, preventing misidentification while maintaining comprehensive monitoring capability.
2Measurement precision
If conventional partial discharge detection devices use two or more antennas to detect discharge location via time difference, then discharge location detection capability is provided, but high-performance and high-cost processing devices are required
Solution Approach 1:
The patent introduces a low-pass filter as an intermediary component on the central conductor to detect external discharge signals. This intermediary approach simplifies the detection system by using the existing central conductor structure rather than requiring multiple antennas and complex time-difference calculation systems, thereby reducing device complexity and cost while maintaining discharge location detection capability.
3Productivity
If vacuum degree monitoring is performed without distinguishing discharge locations, then monitoring capability is provided, but time is wasted to determine whether discharge is internal or external
Solution Approach 1:
The patent implements preliminary action by pre-configuring the low-pass filter on the central conductor to automatically detect external discharge signals before any analysis is needed. This preliminary setup enables the system to immediately distinguish between internal and external discharges upon detection, eliminating the need for time-consuming post-detection analysis and improving monitoring efficiency.
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 detects internal discharges while attenuating external discharge signals, preventing misidentification and reducing the need for high-cost processing devices, thus enhancing vacuum degree monitoring and discharge detection accuracy.
Implementation Method 1
first and second low-pass filters placed around central conductors of the first and second bushings, respectively, for attenuating an external discharge signal in a discharge frequency band propagating from the outside of the tank
Implementation Method 2
an antenna placed in the tank for receiving a discharge signal in the discharge frequency band
Data Source
AI summary
Capacitors (5a, 5b) are provided in the insulators of bushings (4a, 4b), respectively. One ends of the capacitors (5a, 5b) are connected to central conductors (3a, 3b) side, and the other ends are connected to a tank (1) side at the ground potential. When a discharge signal from the outside of the tank (1) reaches the capacitors (5a, 5b) through the central conductors (3a, 3b), the capacitors (5a, 5b) work as a filter to attenuate and prevent the signal in the frequency band of the discharge waveform from propagating to the inside of the tank (1). When an antenna (7) placed in the tank (1) receives a signal in the frequency band of the discharge waveform, a discharge detection unit (20) determines that a discharge inside the tank has been detected.