Simultaneous High-Voltage Cable Diagnosis with Leakage Compensation
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Solution Overview
Problem
Existing diagnostic devices for high-voltage cables and other electrical components can only test one object at a time, require direct connection, and are cumbersome due to their weight and accessibility issues, making simultaneous testing of multiple objects time-consuming and impractical.
Innovation Solution
A diagnostic device with separate connection elements at measurement voltage potential, current detection devices on the high-voltage side, and a long connecting cable to dissipate leakage current, allowing for simultaneous testing of multiple objects with a single high-voltage source, reducing installation effort and improving result comparability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a direct connection adapter is used to connect the measurement object to the measuring circuit, then measurement precision is improved, but device complexity and installation difficulty increase due to the need for direct connection and proximity to the measurement object
Solution Approach 1:
The device is segmented into a measuring circuit unit and separate connection elements that can be distributed along the measurement object. Multiple connection elements can be positioned at different locations along the cable, allowing the measuring circuit to remain at a convenient location while maintaining measurement accuracy through proximity to the measurement point.
Solution Approach 2:
Connection elements serve as intermediaries between the measuring circuit and the measurement object. These connection elements can be integrated into the measurement object structure (e.g., embedded in cable joints or terminations) and provide electrical connection points that allow accurate measurements without requiring the entire measuring device to be positioned at the measurement location.
2Measurement precision
If only one measurement object is tested at a time using a single high-voltage generator, then measurement precision is maintained, but productivity decreases due to time-consuming sequential testing
Solution Approach 1:
The high-voltage generation function is segmented and distributed to multiple independent high-voltage generators, each capable of operating autonomously. Each generator can be assigned to a different measurement object or phase, allowing simultaneous application of measurement voltage to multiple objects while maintaining the precision required for each individual measurement.
Solution Approach 2:
The measuring circuit is designed with multi-functionality to handle measurements from multiple high-voltage generators simultaneously. The circuit can process measurement signals from different phases or objects concurrently, enabling the system to maintain measurement precision while increasing productivity through parallel testing capabilities.
3Ease of operation
If the measuring circuit is arranged on the low-voltage side with connecting cables, then ease of operation is improved, but measurement precision deteriorates due to leakage current in the connecting cables
Solution Approach 1:
The connection elements and measuring circuit are designed to operate at the same high voltage potential during measurement. By eliminating potential differences along the connection path, leakage currents are minimized or eliminated, maintaining measurement precision while allowing the measuring circuit to be positioned at a convenient low-voltage location for ease of operation.
Solution Approach 2:
The electrical connection system is replaced or supplemented with wireless or optical transmission methods for signal transfer. This substitution eliminates the need for physical connecting cables that conduct leakage current, thereby maintaining measurement precision while preserving the ease of operation benefits from having the measuring circuit at a remote location.
4Productivity
If multiple connection elements are provided for simultaneous measurement of multiple measurement objects, then productivity is improved, but device complexity increases due to additional connection elements and high-voltage generators
Solution Approach 1:
Multiple connection elements and their associated high-voltage generation and measurement functions are merged into an integrated modular unit. This modular design allows the system to scale from single-object to multi-object testing by simply adding or activating additional modules, thereby increasing productivity while managing device complexity through standardized, replaceable units.
Solution Approach 2:
The device is designed with universal components that can serve multiple functions. A single measuring circuit can process signals from multiple high-voltage generators and connection elements, and the system can adapt to measure different types of measurement objects (single-phase or three-phase cables) using the same hardware platform, thus increasing productivity without proportionally increasing complexity.
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 efficient, simultaneous diagnosis of multiple high-voltage cables or components with reduced time and effort, improving data comparability and flexibility in installation location, while effectively managing leakage current for accurate measurements.
Implementation Method 1
a high-voltage generator (5) for generating the measurement voltage
Implementation Method 2
the current generated as a result in the device under test... a current detection device connected to the connection adapter
Implementation Method 3
a voltage detection device for measuring the measurement voltage applied equally to all connection elements
Implementation Method 4
at least one connection cable (14) having one or more wire(s) assigned to the respective measurement objects and another wire, not used for contacting a device under test, which is also assigned a (separate) connection element on the device that is at measurement voltage potential and with which, when the wire is connected to the connection element assigned to it, a leakage current occurring in the connecting cable can be fed to a leakage current discharge line
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a device (1) for diagnosing test objects (2, 3, 4) using a measuring voltage that acts on the corresponding test object (2, 3, 4), comprising a high-voltage generator (5) for generating the measuring voltage and an electric measuring circuit (7) for carrying out the diagnosis. A device (1) is equipped to simultaneously diagnose at least two test objects (2, 3, 4), said device having a plurality of separate connecting elements (11, 12, 13) that lie on a measuring voltage potential for this purpose. Each test object (2, 3, 4) is associated with one of the connecting elements (11, 12, 13). The measuring circuit (7) has a voltage detecting device (34) for measuring the measuring voltage that is applied to each connecting element (11, 12, 13) in equal measure and a plurality of current detecting devices (23, 24, 25). The current detecting devices (23, 24, 25) lie on a measuring voltage potential, and each said current detecting device is in contact with a connecting element (11, 12, 13) in order to simultaneously measure the current that can be assigned to each test object (2, 3, 4). Furthermore, the device has at least one connecting cable (14) that is at least 10 meters long for connecting the test objects (2, 3, 4) to the connecting elements (11, 12, 13) that are respectively associated therewith. In addition to one or more wire(s) that are attached to the respective test object, the at least one connecting cable (14) has another wire that is not used for contacting a test object (2, 3, 4). Said wire is likewise attached to a connecting element (10) on the device (1); a leakage current that occurs in the connecting cable (14) can be fed via said wire to a leakage current discharge (19) or a leakage current detector that is disposed on the measuring circuit side.