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An arc and equation technology, applied in the field of arc identification, can solve the problems of needing more time and difficulty in identifying short-circuit arc current, etc., and achieve the effect of narrowing the error space
Active Publication Date: 2022-03-15
LISA DRAXLMAIER GMBH
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The application of 48V however leads to the problem that a stable arc may form in the event of damage with a short circuit, since 48V lies above the arc ignition voltage
The short-circuit arc current is difficult to detect here because it can be in the load range
On the other hand, the arc power is not too high, so that the identification may take more time
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[0028] In the following text, the invention is mainly described in connection with the on-board electrical system of a vehicle. However, the invention can be used in any application in which a distributor is used in which at least one current measurement is carried out for all connected loads and in the leads and arcs may occur, for example, on the corresponding switching elements.
[0029] Errors in the connection (mains to sink) and fault currents occur in an undesired manner in the electrical energy supply. This leads in principle to: Violation of two fundamental relations:
[0030] 1. Violation of the node equation: the currents of all currents connected to (distributor) nodes should be zero. If the sum of all currents (eg the battery current minus the current of all loads) is not zero, then this can infer a fault current or another potential relative to ground.
[0031] 2. Violation of the mesh equation: the voltage at the load should be equal to the voltage at the sour...
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Abstract
A method and a device for identifying electric arcs are presented. Here, for each component (504) connected on a node (502) 1 , 504 2 , 504 3 , 504 4 , 504 5 ,...504 n ) In terms of read current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ); when using the current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ) to determine the node current (Idc) and the system current (Is); as a result of the node current (Idc) and the corresponding current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ) constitutes the quotient (MFc 1 ,MFc 2 ,MFc 3 ,MFc 4 ,MFc 5 ,...MFc n ) to determine each current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ) and the correlation factor of the node current (Idc); filter each quotient (MFc 1 ,MFc 2 ,MFc 3 ,MFc 4 ,MFc 5 ,...MFc n ) so that for each current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ) to determine the correction factor (c 1 ,c 2 ,c 3 ,c 4 ,c 5 ,... c n ); List the revised nodal current equation, where each current value (I 1 ,I 2 ,I 3 ,I 4 ,I 5 ,…I n ) and the correction factor (c 1 ,c 2 ,c 3 ,c 4 ,c 5 ,... c n ) to determine the corrected value (Idi) for the nodal analysis; and set the trigger threshold using the corrected nodal current equation (304).
Description
technical field [0001] The invention relates to a method for detecting electric arcs and a corresponding device for detecting electric arcs. Background technique [0002] The number of electrical consumers and their power consumption in modern vehicles is increasing. The vehicle is therefore equipped with a 48 V onboard electrical system, which is able to supply the various consumers (loads) in the vehicle with a higher power while maintaining the same current intensity. However, the use of 48V leads to the problem that a stable arc can form in the event of damage with a short circuit, since 48V lies above the arc ignition voltage. However, the formation of stable arcs does not occur only in the case of 48 V on-board electrical systems in motor vehicles, but generally in on-board electrical systems that operate at voltages that exceed the ignition voltage of the arc, such as in the field of electromobility and here It also occurs in the field of high-voltage on-board elect...
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