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Method of performing a circuit-breaking and closing operation

A technology for closing operation and execution, applied in the direction of high-voltage air circuit breaker, automatic disconnection emergency protection device, protection switch operation/release mechanism, etc.

Active Publication Date: 2020-10-09
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is an object of the present disclosure to provide a method of performing breaking and closing operations that solves or at least alleviates the problems of the prior art

Method used

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  • Method of performing a circuit-breaking and closing operation
  • Method of performing a circuit-breaking and closing operation
  • Method of performing a circuit-breaking and closing operation

Examples

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Embodiment Construction

[0034] The inventive concept will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. Inventive concepts may however be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and the present The scope of the inventive concept fully conveys to those skilled in the art. Throughout this specification, the same reference numerals refer to the same elements.

[0035] figure 1 An example of a control system 1 for performing opening and closing operations is shown. The control system 1 comprises a processing circuit 3 and a storage medium 5 .

[0036] Processing circuitry 3 may, for example, use a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit (ASI...

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PUM

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Abstract

A method of performing a circuit-breaking and closing operation in a three-phase system having a first phase, a second phase lagging the first phase by 120 degrees, and a third phase lagging the firstphase by 240 degrees, wherein the method comprises: a) opening only one of the first phase, the second phase and the third phase before a zero crossing of a current of the corresponding phase, b) opening the remaining phases of the first phase, the second phase and the third phase after step a), and c) closing the first phase, the second phase and the third phase simultaneously or essentially simultaneously at a phase to ground voltage of the phase of the first phase, the second phase and the third phase which lagging the phase that was opened in step a) by 120 degrees in a time range from 60degrees before a peak of said phase to 90 degrees after the peak.

Description

technical field [0001] The present disclosure generally relates to a method of performing opening and closing operations. Background technique [0002] Circuit breakers may experience a large number of breaking operations in some applications. For example, in electric arc furnace applications, circuit breakers wear out very quickly because they are operated extremely frequently, around 100 times per day. [0003] Earlier, the circuit breakers used to operate the electric arc furnace were not synchronized. This leads to severe contact wear, especially considering that arc furnace circuit breakers operate so frequently. This can also lead to severe transient stresses in the system; reignition when circuit breakers are opened and inrush currents when electric arc furnace transformers are closed. [0004] EP3358588A1 discloses a three-phase circuit breaker, the first phase of which is opened before the zero crossing of the phase, wherein the second and third phases are opened...

Claims

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Application Information

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IPC IPC(8): H01H9/56H01H33/60H01H71/12
CPCH01H33/60H01H9/563H01H71/12H02H3/021H02H3/083H02H3/06H01H9/0072H01H33/022H01H33/593H05B7/02
Inventor E·林德尔S·哈伦L·琼森
Owner ABB (SCHWEIZ) AG