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Switch, especially low-voltage circuit breaker

A low-voltage circuit breaker and switch technology, applied in the field of switches, can solve the problem of transformers relying on the rated current of switches

Inactive Publication Date: 2013-08-21
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here are the disadvantages: Different transformers need to be used for different frames (for example frames with switches rated at 250A and 630A); said transformers also vary based on core size; because frames are often used for multiple switches rated current, the transformers sometimes also depend on the respective switch rated current

Method used

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  • Switch, especially low-voltage circuit breaker
  • Switch, especially low-voltage circuit breaker

Examples

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Embodiment Construction

[0014] figure 1 A switch 1 is shown, which is designed here as a low-voltage circuit breaker. The wire L passes through the switch 1 via the switch contact 2, if the switch contact 2 is as figure 1 is opened, the switch contact 2 interrupts the line L and thus the current I flowing through the line L. A transformer W is arranged on the conductor L, said transformer W generates a transformer voltage U proportional to the first time derivative of the conductor current I, which is converted by a subsequently connected integrator IG into a current is proportional to voltage UE. The trigger unit ETU is supplied with a voltage UE and compares this voltage UE with a given threshold value. If the voltage UE (and thus the current I) exceeds the threshold value, the triggering unit ETU triggers the switching mechanism M via the actuator A, which opens the switching contacts. its passing figure 1 The dotted line in indicates. If the switch contact 2 is opened, its contact parts are...

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Abstract

The invention relates to a switch, especially a low-voltage circuit breaker. The switch comprises: a lead, switch contacts that can be disconnected by a switching mechanism, a current transformer having a non-magnetic core with a through hole where the lead is guided to pass through, and a wire-wound coil wound in layers around the core. Winding direction is alternatively changed for two immediately superimposed coil layers. A current-proportional voltage is generated by an integrator. The voltage is applied to an electronic triggering unit which compares the voltage with current conditions and operates the switching mechanism used for separating the switch contacts when the current conditions are met, especially when the voltage exceeds a current threshold value. In order that relatively small mutual inductor can be realized under the conditional of different structural dimensions, it is recommended that the sizes of the cores are identical and the number of layers and / or number of turns of each layer increase along with the increase of the structural dimensions of the switch.

Description

technical field [0001] The invention relates to a switch, in particular to a low-voltage circuit breaker according to the invention. Background technique [0002] Low-voltage circuit breakers are already widely known and used to protect consumers and switchgear. The switches are mostly constructed with multiple poles, one conductor for each pole (per phase) passing through the switch. Arranged in the switch are switching contacts which are separated by the switching mechanism when a line is to be interrupted. Current transformers are used to detect the current flowing through the conductors, said current transformers having a non-magnetic core with a through-opening through which the associated conductor is guided. The core has a wire winding in the form of a multi-winding layer, the turns of which are wound around the core through the through-openings. In this case, the winding direction (Wicklungssinn) of every two winding layers directly adjacent one above the other is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/64H02H3/08
CPCH01H71/125G01R15/181
Inventor M·格罗斯
Owner SIEMENS AG