Fault-arc identification unit

A technology of fault arc and identification unit, which is applied in the direction of electrical components, protection that responds to fault current, and measurement of electricity, to achieve the effect of simple method and simple determination of possibility

Active Publication Date: 2019-03-08
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This has the disadvantage that optical waveguides or optical detection systems must be arranged parallel to the lines or conductor tracks in order to detect possible arc faults

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0058] In a circuit or network in which an arc fault is burning, current and voltage curves can be measured, which have a distinct trend. A typical voltage and current curve for an arc fault is at figure 1 shown in . figure 1 An illustration of a diagram is shown in which the voltage U and the current I are plotted over time in an electrical circuit, in particular a low-voltage electrical circuit, after ignition of an arc or a fault arc, in particular a parallel fault arc.

[0059] Time t is shown in milliseconds (ms) on the horizontal X-axis. On the vertical Y axis, the magnitude of the voltage U is presented in volts (V) on the left scale. The magnitude of the current I is presented in amperes (A) on the right scale.

[0060] After ignition of the arc, the current I runs approximately sinusoidally. In this case, the voltage U runs “saw-tooth-shaped” with rapid voltage changes. Roughly speaking, the voltage profile is rectangular to a first approximation, rather than the...

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PUM

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Abstract

The invention relates to a fault-arc identification unit for a low-voltage electric circuit, having: at least one voltage sensor for the periodic determination of electric voltage values (un, un-1) ofthe electric circuit; and at least one current sensor for the periodic determination of current values (in, in-1) of the electric circuit. Both sensors are connected to an evaluation unit which is designed such that it has as a first criterion a change in the voltage over time which exceeds a first threshold value (SW1) or falls below a second threshold value (SW2), and as a second criterion a change in the increase of current which exceeds a third threshold value (SW3) or falls below a fourth threshold value (SW4). If both criteria are fulfilled, a fault-arc identification signal is emitted.

Description

technical field [0001] The invention relates to an arc fault detection unit, a circuit breaker, a short circuit and a method for detecting an arc fault. Background technique [0002] In low-voltage circuits or low-voltage installations or low-voltage networks, ie in circuits with voltages up to 1000 V AC or up to 1500 V DC, short circuits are often associated with the occurrence of fault arcs, for example parallel or series fault arcs. In particular, in highly efficient power distribution and switchgear installations, in the event of insufficient disconnection, the latter can lead to catastrophic damage to operating devices, installation components or the entire switchgear. In order to avoid long-term and large-scale blackouts and to reduce personal injury, it is necessary to detect and extinguish such fault arcs, especially amperage or parallel fault arcs, within a few milliseconds. Conventional protection systems for power supply equipment such as fuses and circuit breake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H1/00H02H3/38H02H3/44H02H3/50
CPCH02H1/0015H02H1/0023H02H3/38H02H3/44H02H3/50H02H3/16G01R31/14G01R19/165G01R31/52G01R31/50
Inventor K.温兹拉夫J.迈耶P.谢格纳
Owner SIEMENS AG
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