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Current measuring method for switchgear having current paths connected in parallel

A technology for current paths and switching devices, applied in the field of current measurement for switching devices with parallel current paths, can solve problems such as larger trigger tolerances

Inactive Publication Date: 2013-04-10
EATON ELECTRICAL IP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem of increased triggering tolerances with asymmetrical electrode currents is also not solved with this arrangement

Method used

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  • Current measuring method for switchgear having current paths connected in parallel
  • Current measuring method for switchgear having current paths connected in parallel
  • Current measuring method for switchgear having current paths connected in parallel

Examples

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Embodiment Construction

[0018] figure 1 A four-pole power switch is shown as a switching device with four current paths L1 , L21 , L22 and L3 , which are connected to switching contacts 1 , 2 , 3 and 4 in each case. In contrast to the two outer current paths L1 and L3, the two inner current paths L21 and L22 are connected in parallel. The phase current of the intermediate current phase is thus divided into two pass currents i21 and i22. The two outer phase currents are not split, and thus pass currents i1 and i3 are equal. As a result of this measure, the rated current-carrying capacity of the switching device is overall increased. The switchgear is equipped with electronic triggering devices including 7 (see figure 2 ) of the trigger device 5. The passage currents i1 , i21 , i22 and i3 flowing in the connected switching contacts 1 to 4 are detected by the triggering device 5 . In the event of a short circuit, tripping device 5 is activated, opens contacts 1 to 4 via operating mechanism 6 witho...

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Abstract

The invention relates to a current measuring method for switchgear having current paths (L21; L22) connected in parallel. The digital measured values (1'; 21'; 21'; I3') derived from the path currents (i1; i21; i22; i3) are converted into corrective values (I1; I2; I3) to compensate (Kn; Kp) for the non-linear transmission characteristics (N) associated with the transformer-based current transformation. The respective total value and difference values are determined from the digital measured values (I21', I22') associated with the current paths (L21, L22) connected in parallel, wherein at least one respective difference value is included in forming the associated corrective values (12) and the associated corrective values (12) represent the total of the associated path currents (i21, i22).

Description

technical field [0001] According to the preamble of claim 1 , the invention relates to a current measurement method for a switching device, in particular a power switch or a motor protection switch, which is used for low-voltage alternating current and has a parallel current path. Background technique [0002] Embodiments of switching devices, such as power switches, are known in which current paths are connected in parallel to increase the current carrying capacity. Embodiments of four-pole switching devices are also known in which only two intermediate current paths are connected in parallel in order to increase the rated current. When such a switching device is implemented with an overcurrent trigger, in particular with an electronic overcurrent trigger, the measurement signals of the two outer current paths and the two parallel connected inner current paths must be detected and carried out with sufficient accuracy. deal with. [0003] Usually, the measurement of the ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/40H02H3/00
CPCH02H1/0092H02H3/083
Inventor R·科瑞夏尔A·祖玛柏克
Owner EATON ELECTRICAL IP