Insulation Diagnostic System for Delta Rotating Machines
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Solution Overview
Problem
Existing insulation diagnostic systems for rotating machines require complex configurations and specialized optical fiber sensors, making online diagnosis during operation challenging, especially with the advent of new semiconductor materials like SiC that exacerbate inverter surges and insulation degradation.
Innovation Solution
A simple insulation diagnostic system using a general-purpose current detection sensor installed around the leader line of a Δ connection type rotating machine, allowing current to flow in reverse direction at the winding start and end, enabling effective insulation degradation detection without the need for specialized sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fiber current sensors are wound at two coil positions in opposite directions with the same number of windings, then leakage current can be detected through signal processing, but the device complexity increases and general-purpose sensors cannot be used
Solution Approach 1:
The invention extracts the current detection function from complex optical fiber sensor systems and implements it using simple clamp-type current detectors on leader lines. By focusing detection on the leader lines rather than winding sensors around entire coils, the system achieves leakage current detection with much simpler hardware configuration.
Solution Approach 2:
The invention introduces leader lines as intermediary elements that carry current between coils and power supply terminals. By placing clamp-type detectors on these leader lines, the system indirectly detects coil current without requiring direct sensor integration with the coils, thus simplifying the overall detection system.
2Reliability
If optical fiber current sensors are used for constant current monitoring during operation, then insulation degradation can be detected online, but the ease of operation decreases due to specialized sensor requirements
Solution Approach 1:
The invention makes the detection system universal by using clamp-type current detectors that can monitor current in any phase of a three-phase power supply system. These detectors can be easily attached to or removed from leader lines without specialized installation procedures, enabling flexible online monitoring during machine operation or maintenance.
Solution Approach 2:
The system enables self-service operation where detectors can be easily attached to leader lines by operators without requiring specialized training or tools. The clamp-type design allows simple attachment and removal, making the system user-friendly for routine monitoring tasks.
3Measurement precision
If offline diagnosis is performed by stopping the rotating machine, then the extent of degradation can be understood, but productivity decreases due to production interruption
Solution Approach 1:
The invention enables continuous current monitoring during machine operation by attaching detectors to leader lines that remain accessible throughout operation. This allows insulation degradation to be monitored in real-time without stopping the machine, maintaining continuous production while providing ongoing diagnostic information.
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 straightforward online insulation degradation diagnosis in rotating machines, improving operational efficiency by allowing continuous monitoring without disrupting production and accommodating various installation environments.
Implementation Method 1
a current detection sensor that is installed... such that the current detection sensor surrounds a current path flowing into a leader line at the winding start of the coil and a current path flowing out from a leader line at the winding end of the coil
Data Source
AI summary
An object is to conduct an insulation degradation diagnosis with a simple configuration. An insulation diagnostic system includes a current detection sensor 4a that is installed, for a coil 3a of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start position and a winding end position, such that the current detection sensor 4a surrounds a current path flowing into a leader line at the winding start of the coil 3a and a current path flowing out from a leader line at the winding end of the coil 3a.