Insulation Fault Location in Ungrounded Power Systems
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Solution Overview
Problem
Existing methods for insulation fault location in ungrounded power supply systems can identify faulty cable outlets but not determine the exact position of the fault, hindering quick repair and ensuring electrical security.
Innovation Solution
Combining classic insulation fault location methods with time-domain reflectometry to generate and analyze measuring pulses, allowing for the precise identification of fault positions by comparing reflection signals and calculating difference signals to determine the fault location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If classic insulation fault location methods are used to identify faulty cable outlets, then the faulty cable outlet can be determined, but the exact fault position on the cable outlet cannot be determined
Solution Approach 1:
The patent combines classic insulation fault location methods with time-domain reflectometry to merge the advantage of faulty cable outlet identification with the advantage of precise fault position determination, thereby achieving both complete fault identification and exact location
Solution Approach 2:
The patent introduces time-domain reflectometry as an intermediary method to bridge the gap between identifying a faulty cable outlet and determining the exact fault position on that outlet, using reflection signals as the mediator to obtain precise location information
2Productivity
If only classic insulation fault location is performed, then the faulty cable outlet is identified, but repair time is extended due to lack of precise fault position
Solution Approach 1:
The patent applies preliminary action by using time-domain reflectometry to determine the exact fault position on the identified faulty cable outlet, so that when repair personnel arrive at the cable outlet, they already know the precise location of the fault, enabling immediate repair without additional search time
3Measurement precision
If time-domain reflectometry is applied to determine exact fault position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the insulation fault location device to perform multiple functions: both classic insulation fault location to identify faulty cable outlets and time-domain reflectometry to determine exact fault positions, thereby reducing the need for separate devices and minimizing overall system 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 reliable and swift identification of insulation fault positions, facilitating quicker repairs and enhancing electrical security through precise fault location and permanent status monitoring.
Implementation Method 1
determining an insulation fault position on the faulty cable outlet by means of a method of time-domain reflectometry
Data Source
AI summary
A method for insulation fault location in a branched, ungrounded power supply system includes determining an insulation fault position being carried out in combination with evaluating information for identifying a faulty cable outlet according to the method of time-domain reflectometry. Furthermore, the invention relates to a method for insulation fault identification in a branched power supply system and for status monitoring of the branched power supply system, an image of all reflection positions on the power supply system being carried out based on a method of time-domain reflectometry. Moreover, the invention relates to a device for insulation fault location in a branched, ungrounded power supply system having the function units insulation fault test apparatus and insulation fault evaluation device having a measuring current transformer, the device comprising a time-domain reflectometer having a controller so as to implement the method according to the invention.