Method and device for detecting and localizing faults in electrical installations
First Claim
1. Method for detecting and localizing faults in electrical installations, which comprises:
- (a) performing partial discharge measurements and high frequency measurements at least at one location in the electrical installation and optionally in all phases;
(b) selectively comparing the measurement values with each other and with calibration signals;
(c) drawing conclusions from the measurements regarding the location and the type of the fault;
(d) selectively continuously and periodically performing the measurements at least at three measuring points while the installation is in operation;
(d) simulating the electrical installation in a computer as a high-frequency network, while simulating faults with the signals originating therefrom at the measuring points;
(e) comparing any measurement values which indicate faults with the simulated signal values for different fault types and fault locations; and
(f) determining the type and location of the fault from the simulated signal values which best agree with the measurement values and from the corresponding simulated fault; and
concurrently monitoring and utilizing measuring values of sound measuring pickups and including them in the analysis of the fault.
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Accused Products
Abstract
A method and device for detecting and localizing fault in electrical installations includes performing partial discharge measurements and high-frequency measurements at least at one location in the electrical installation and optionally in all phases, selectively comparing the measurement values with each other and with calibration signals, drawing conclusions from the measurements regarding the location and the type of the fault, selectively continuously and periodically performing the measurements at least at three measuring points while the installation is in operation, simulating the electrical installation in a computer as a high-frequency network, while simulating fault with the signals originating therefrom at the measuring points, comparing any measurement values which indicate fault with the simulated signal values for different fault types and fault locations, and determining the type and location of the fault from the simulated signal values which best agree with the measurement values and from the corresponding simulated fault.
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Citations
15 Claims
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1. Method for detecting and localizing faults in electrical installations, which comprises:
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(a) performing partial discharge measurements and high frequency measurements at least at one location in the electrical installation and optionally in all phases; (b) selectively comparing the measurement values with each other and with calibration signals; (c) drawing conclusions from the measurements regarding the location and the type of the fault; (d) selectively continuously and periodically performing the measurements at least at three measuring points while the installation is in operation; (d) simulating the electrical installation in a computer as a high-frequency network, while simulating faults with the signals originating therefrom at the measuring points; (e) comparing any measurement values which indicate faults with the simulated signal values for different fault types and fault locations; and (f) determining the type and location of the fault from the simulated signal values which best agree with the measurement values and from the corresponding simulated fault; and
concurrently monitoring and utilizing measuring values of sound measuring pickups and including them in the analysis of the fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Device for detecting and localizing faults in a power station block including components, comprising at least three operational measuring points for high-frequency output coupling;
- operational measuring devices in the form of ultrasonic pickups; and
the following means; means for performing partial discharge measurements and high-frequency measurements at least at one of said operational measuring points and optionally in all phases; means for selectively comparing the measurement values with each other and with calibration signals; means for drawing conclusions from the measurements regarding the location and the type of the fault; means for selectively continuously and periodically performing the measurements at said at least three measuring points while the installation is in operation; means for simulating the electrical installation in a computer as a high-frequency network, while simulating fault with the signals originating therefrom at the measuring points; means for comparing any measurement values which indicate fault with the simulated signal values for different faults and fault locations; and means for determining the type and location of the fault from the simulated signal values which best agree with the measurement values and from the corresponding simulated fault. - View Dependent Claims (12, 13, 14, 15)
- operational measuring devices in the form of ultrasonic pickups; and
Specification