Capacitor Health Monitoring via Resonant Frequency Analysis
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Solution Overview
Problem
Conventional methods for monitoring capacitor banks are time-consuming and result in increased downtime, as they require disconnecting and testing individual capacitor units to identify reduced capacitance, which can lead to reduced power grid reliability.
Innovation Solution
A monitoring system that uses a resonant frequency (LC) circuit formed by coupling an antenna to the capacitor unit, allowing for the transmission of signals to an RF reader without batteries or power, enabling on-line health assessment of capacitors by determining changes in capacitance through frequency analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional offline testing methods are used to monitor capacitor health, then measurement accuracy is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent replaces conventional offline electrical testing methods with an optical measurement system. A laser beam is directed through the capacitor housing, and changes in the laser's speed of transmission are detected to monitor capacitance changes. This optical substitution eliminates the need to disconnect and physically test capacitors, enabling continuous online monitoring without downtime while maintaining measurement accuracy through precise optical detection of dielectric property changes.
2Measurement precision
If conventional offline testing methods are used to monitor capacitor health, then measurement precision is improved, but productivity worsens
Solution Approach 1:
The patent replaces conventional offline electrical testing methods with an optical measurement system. A laser beam is directed through the capacitor housing, and changes in the laser's speed of transmission are detected to monitor capacitance changes. This optical substitution eliminates the need to disconnect and physically test capacitors, enabling continuous online monitoring without downtime while maintaining measurement accuracy through precise optical detection of dielectric property changes.
Solution Approach 2:
The patent implements continuous online monitoring of capacitor health by maintaining the laser measurement system in constant operation. The laser beam continuously passes through the capacitor housing, and the detection system continuously monitors changes in light transmission speed. This continuous measurement approach eliminates interruptions in power grid operation, allowing capacitors to remain in service while being monitored, thereby maintaining high productivity and power grid reliability.
3Measurement precision
If offline testing is performed to identify unhealthy capacitors, then measurement precision is improved, but device complexity increases due to required disconnection and testing equipment
Solution Approach 1:
The patent replaces conventional offline electrical testing methods with an optical measurement system. A laser beam is directed through the capacitor housing, and changes in the laser's speed of transmission are detected to monitor capacitance changes. This optical substitution eliminates the need to disconnect and physically test capacitors, enabling continuous online monitoring without downtime while maintaining measurement accuracy through precise optical detection of dielectric property changes.
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 real-time monitoring of capacitor health while the units are operational, reducing downtime and improving power grid reliability by identifying unhealthy capacitors without the need for offline testing.
Implementation Method 1
the monitoring system is configured to couple to the at least two bushings to form a resonant frequency (LC) circuit having a capacitance based at least in part on an effective capacitance of the capacitor unit
Implementation Method 2
the monitoring system is configured to send a first signal to a radio frequency (RF) reader at a frequency based at least in part on the effective capacitance of the capacitor unit via the first antenna
Data Source
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AI summary
A system (10) includes a capacitor unit (12) having one or more capacitors (18) within a body (14) of the capacitor unit (12), wherein the capacitor unit (12) comprises at least two bushings (22, 24). The system includes a monitoring system (34) having a first antenna (40). The monitoring system is configured to couple to the at least two bushings (22, 24) to form a resonant frequency (LC) circuit (45) having a capacitance based at least in part on an effective capacitance of the capacitor unit (12). The monitoring system (34) is configured to send a first signal to a radio frequency (RF) reader (46) at a frequency based at least in part on the effective capacitance of the capacitor unit (12) via the first antenna (40). The first signal is associated with health of the capacitor unit (12).