Insulation Diagnostic System for Rotating Electrical Machines
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Solution Overview
Problem
Existing insulation diagnostic techniques for rotating electrical machines face challenges in accurately converting voltage signals from sensors into charge amounts for effective insulation diagnosis, particularly in non-contact online partial discharge measurements, which are crucial for determining the residual life of these machines.
Innovation Solution
The proposed solution involves an insulation diagnostic system that includes a peak-value acquisition circuit, a function acquisition circuit, and a charge-amount calculation circuit to convert voltage signals into charge amounts using peak values and calculation functions, enabling accurate estimation of residual life during both offline and online operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact method is used for partial discharge measurement, then accurate electrostatic capacitance measurement is achieved, but device complexity and installation time increase significantly
Solution Approach 1:
The patent extracts the essential measurement function from the complex contact method by using non-contact sensing. The sensor detects voltage signals through electromagnetic coupling without requiring physical connection to the rotating electrical machine, thereby eliminating the need for capacitor connection and insulation design while maintaining measurement capability.
Solution Approach 2:
The patent introduces an intermediary electromagnetic field as a mediator between the sensor and the rotating electrical machine. The sensor detects voltage signals through electromagnetic coupling in the space around the machine, avoiding direct contact and the associated complexity of contact methods.
2Measurement precision
If the contact method is used for partial discharge measurement, then accurate electrostatic capacitance measurement is achieved, but power outage time increases significantly
Solution Approach 1:
The patent extracts the measurement function from the contact method, enabling non-contact sensing that does not require disconnecting or reconnecting capacitors. This allows the rotating electrical machine to be measured while running or with minimal interruption, significantly reducing power outage time compared to the contact method.
3Adaptability or versatility
If the non-contact method is used for partial discharge measurement, then device installation flexibility is improved, but measurement precision deteriorates due to small electrostatic capacitance
Solution Approach 1:
The patent replaces the mechanical contact-based measurement system with an electromagnetic sensing system. The sensor detects voltage signals through electromagnetic coupling rather than physical contact, maintaining flexibility in installation while improving measurement capability through advanced signal processing and peak value analysis.
Solution Approach 2:
The patent changes the measurement parameter from direct electrostatic capacitance measurement to voltage signal peak value detection. By analyzing the peak values of voltage signals detected through electromagnetic coupling, the system achieves accurate measurements without requiring large electrostatic capacitances, thus maintaining both flexibility and precision.
4Productivity
If non-contact online diagnosis is performed, then operational continuity is maintained, but noise signal elimination becomes more difficult
Solution Approach 1:
The patent employs feedback mechanisms through the diagnosis apparatus that continuously monitors and analyzes voltage signals during operation. The system uses the detected peak values to identify partial discharge events and eliminates noise signals through sophisticated signal processing, maintaining operational continuity while managing noise challenges.
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
This approach allows for precise insulation diagnosis and residual life estimation of rotating electrical machines by accurately converting voltage signals into charge amounts, enhancing the operational efficiency and reliability of these machines by identifying potential failures early.
Implementation Method 1
a voltage signal is acquired by a sensor installed at a distance from a high-voltage conductor
Data Source
AI summary
According to one embodiment, an insulation diagnostic system comprising: a peak-value acquisition circuit configured to acquire at least one peak value of a section corresponding to local discharge of a voltage signal acquired by at least one sensor that detects the voltage signal in a non-contact manner; a function acquisition circuit configured to acquire a calculation function for calculating charge amount related to the discharge based on at least two peak values acquired from the voltage signal that is detected by the sensor by applying a test voltage to a rotating electrical machine while the rotating electrical machine is stopped; and a charge-amount calculation circuit configured to calculate the charge amount related to partial discharge of the rotating electrical machine based on the calculation function and the peak value obtained from the voltage signal that is detected by the sensor during operation of the rotating electrical machine.