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Interference arc detection unit

A technology for interfering arcs and identifying units, applied to electrical components, measuring circuits, testing circuits, etc., to achieve timely and fast determination and accurate identification of interfering arcs

Active Publication Date: 2020-11-20
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantage is that optical waveguides or optical detection systems must be laid parallel to electrical conductors or busbars to identify possible interfering arcs

Method used

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Examples

Experimental program
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Embodiment Construction

[0034] In a circuit or network where an arc ignites the current and voltage history can be measured, which has a distinct history. Typical voltage and current histories for a disturbing arc are at figure 1 in the icon. figure 1 An illustration of a graph is shown in which the time course of the voltage U and the current I after ignition of an arc or a disturbance arc, in particular a parallel disturbance arc, in an electric circuit, in particular in a low-voltage circuit, is shown.

[0035] Time is illustrated in milliseconds (ms) on the horizontal X-axis. The magnitude of the voltage U in volts (V) is plotted on the left scale on the vertical axis Y. The magnitude of the current in amperes (A) is plotted on the right scale.

[0036] After ignition of the arc, the current I has an approximately sinusoidal course. The voltage U has a clearly distorted course, for example a "sawtooth" course with rapid voltage changes. Roughly explained, the voltage history is almost rectangu...

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Abstract

The invention relates to a disturbance arc detection unit for a low-voltage circuit having at least one voltage sensor for periodically determining a voltage value (u(n), u(k)) of the circuit, said voltage sensor being connected to an evaluation unit , the evaluation unit is configured to continuously sum the first halves of the first number of voltage values ​​(u(n), u(k)) into a first partial sum (TS1) and to add the voltage values ​​(u(n) ), u(k)) is the second partial sum (TS2), and the difference (DU) of the two partial sums is determined. On the one hand the difference (DU) or the magnitude of the difference (DU) is compared with a first threshold value (SW1) and a disturbing arc detection signal (SLES) is issued when said first threshold value is exceeded, or on the other hand the difference (DU) is compared with a second threshold value (SW2), and a disturbing arc recognition signal (SLES) is issued when said second threshold value is exceeded.

Description

technical field [0001] The invention relates to a disturbance arc detection unit, a power switch, a crowbar and a method for disturbance arc detection. Background technique [0002] In low-voltage circuits or low-voltage installations, ie in low-voltage networks for circuits up to 1000 volts AC or 1500 volts direct current, short circuits are often associated with the occurrence of interference arcs, such as parallel or series interference arcs. In particular in high-power distribution systems and switchgears, such disturbance arcs can lead to devastating damage to operating devices, installation parts or the entire switchgear if they are not disconnected quickly enough. In order to avoid long-term and large-area interruptions of the energy supply and to reduce personal injury, it is necessary to detect and extinguish such interfering arcs, in particular high-current or parallel interfering arcs, within milliseconds. Conventional protection systems for energy supply equipme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/14G01R31/12G01R19/165
CPCG01R19/16571G01R19/16576G01R31/1227G01R31/14G01R31/52H02H1/0015H02H3/16
Inventor J.迈耶K.文茨拉夫P.谢格纳
Owner SIEMENS AG