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Method for operating a fault-current circuit breaker, and fault-current circuit breaker

A fault current protection and current protection technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, electrical components, etc., can solve problems such as difficulties

Inactive Publication Date: 2014-06-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because measuring the potential applied across the voltage tap with sufficient precision proved to be difficult

Method used

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  • Method for operating a fault-current circuit breaker, and fault-current circuit breaker
  • Method for operating a fault-current circuit breaker, and fault-current circuit breaker
  • Method for operating a fault-current circuit breaker, and fault-current circuit breaker

Examples

Experimental program
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Embodiment Construction

[0026] The fault current circuit breaker, indicated as a whole by 10, has terminal pairs 12a, 12b, 14a, 14b, which can be coupled to a (not shown) mains line. The two terminals of a terminal pair are each coupled to one another via a primary line 16 or 18 , wherein a disconnection is provided in this primary line by means of a switch 20 or 22 . If a mains conductor is connected to the connections 12a, 12b, 14a and 14b, the switches 20 and 22 are closed in the regulating situation, whereby current can flow through the mains conductor. The task of the fault current protective switch 10 is to open the switches 20, 22 when a fault current flows. A fault current is a current that flows through one of the primary conductors 16 and 18 but cannot return through the other of the primary conductors 16 and 18 . Switches 20 and 22 are opened by means of a switch lock 24 .

[0027] The detection of whether a fault current is flowing is now carried out by means of a total current converte...

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PUM

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Abstract

In a fault-current circuit breaker (10), the principle of controlled inductance is used: a secondary coil (30) is exposed to pulses from a square-wave generator (40). According to the invention, the pulse height of the square pulses output by the square-wave generator (40) varies in order to regulate the current flowing through the secondary coil (30) in such a manner that the time derivative of the amperage has a constant magnitude. If the voltage is now measured at two ends (32, 36) of the secondary coil (30), said voltage is directly a measure of the inductance of the secondary coil (30), and any fault current can be deduced therefrom.

Description

technical field [0001] The invention relates to a method for operating a fault current circuit breaker according to the preamble of claim 1 and a fault current circuit breaker according to the preamble of claim 6 . Background technique [0002] Such a method and such a fault current circuit breaker are known from DE 3642393 A1, the publication itself being based on DE-A-3424959. [0003] A typical fault current protective switch has several pairs of connections for the grid conductors, namely two pairs in single-phase systems and four pairs in three-phase systems, and these connections are each connected to each other via a primary conductor and in the primary conductor Set the switch for disconnecting the corresponding connection. All primary conductors are routed through the primary side of the power converter, wherein these primary conductors are usually formed as primary windings within the power converter. A secondary winding is provided on the secondary side of the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/33
CPCH02H3/332
Inventor A.许贝尔T.施波雷尔
Owner SIEMENS AG