Method and device for the detection of fault current arcing in electric circuits
First Claim
1. A method for detecting fault current arcing in which a current is measured in at least one line of a load circuit and a monitoring signal is generated using a converted current measurement value, wherein arcing is detected when at least one threshold defined for the monitoring signal is exceeded in the load circuit, characterized by the following steps:
- measuring a voltage value simultaneous with the current measurement;
forming a ratio from current measurements and voltage measurements detected in parallel; and
generating an indicator signal for arcing when changes in the ratio of the current measurements and voltage measurements exceed predetermined threshold values.
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Abstract
The invention is directed to a method and a device for detecting fault current arcing in electric circuits for consumers with relatively constant power consumption, particularly in onboard aircraft power supplies. The object of the invention is to find a novel possibility for detecting arc faults in electric lines of consumers with a relatively constant power consumption which appreciably reduces erroneous triggering of safeguards without compromising the reliability of switching off in the event that arcing actually occurs. This object is met, according to the invention, in that a voltage value is measured simultaneous with the current measurement, a ratio is formed of the current measurement values and voltage measurement values that are detected in parallel, and an indicator signal is generated for detected arcing when changes in the ratio of current measurement values and voltage measurement values exceed a predetermined threshold value.
91 Citations
39 Claims
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1. A method for detecting fault current arcing in which a current is measured in at least one line of a load circuit and a monitoring signal is generated using a converted current measurement value, wherein arcing is detected when at least one threshold defined for the monitoring signal is exceeded in the load circuit, characterized by the following steps:
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measuring a voltage value simultaneous with the current measurement; forming a ratio from current measurements and voltage measurements detected in parallel; and generating an indicator signal for arcing when changes in the ratio of the current measurements and voltage measurements exceed predetermined threshold values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An arrangement for determining arc faults in load circuits, particularly in onboard power supplies in aircraft and spacecraft, comprising:
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a current sensor is arranged in at least one line of the load circuit; an analog-to-digital converter is arranged downstream of the current sensor for generating time-discrete sample values of a current signal; and a function unit is provided for evaluating selected sample values, for suppressing interference not caused by arcing, and for generating a fault signal when sample values are detected beyond a predetermined threshold; in addition to the current sensor, a voltage sensor is arranged in the line of the load circuit; a division element is arranged downstream of the current sensor and voltage sensor for forming ratio values from current values and voltage values that are measured simultaneously; and an evaluation unit is arranged downstream of the division element for generating a fault signal for detected impermissible arcing; said evaluation unit has at least one threshold evaluation unit for determined ratio values of current values and voltage values for generating a fault signal for detected arcing. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification