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Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker

A protective device and automatic adjustment technology, which is applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc. The problem of additional difficulty in the adjustment of the release, to achieve the effect of improving accuracy

Inactive Publication Date: 2013-01-02
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the manufacturer of the motor gives the technical data of the asynchronous motor (rated power, starting current compared to the rated current, etc.), these technical data cannot ideally adjust the overcurrent release and thus the low voltage circuit breaker.
Since the control parameters of the protective device depend on the load, it is additionally difficult to adjust the overcurrent release
Different characteristic curves for the individual asynchronous motors also make adjustment difficult

Method used

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  • Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker
  • Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker
  • Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker

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Embodiment Construction

[0017] figure 1 A schematic diagram shows a protective device 1 in the form of a low-voltage circuit breaker for an energy distribution system, an asynchronous motor 2 with a load 3 connected downstream of the protective device as a consumer to be protected, wherein the load 3 is here Equivalent to rated load in this example. The guard 1 is protected against overload and protects the energy distribution device against short circuits. The protective device has an overcurrent release, on which a plurality of parameters can be set, in particular for adapting the asynchronous motor 2 . These parameters are automatically determined from the time profile of the motor current and the square of the motor current I of the asynchronous motor 2 .

[0018] The motor current I of the asynchronous motor 2 as a function of time t in figure 2 shown in . Conditioned by the necessary magnetization immediately after switching on the asynchronous motor 2, the figure 2 The motor current cur...

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Abstract

The method for the automatic adjustment of a protective device includes determining an integral of the square of a motor current over time on the basis of a time motor current profile of an asynchronous motor on a load, after switching on and reversing and deriving a tripping time of the overcurrent release on the basis of the determined integral, the integral, which corresponds to a heating of the asynchronous motor, being related to a multiple of the square of the rated current, and the motor current profile including at least the starting current, the transient and the selected motor rated current.

Description

technical field [0001] The invention relates to a method for automatically adjusting a protective device with an overcurrent release, in particular a low-voltage circuit breaker with an overcurrent release. Background technique [0002] Low-voltage circuit breakers are well known as protective devices and are also used as special consumers for the protection of asynchronous motors. Its function is to protect the asynchronous motor against overloading and short-circuits in the energy distribution system. Especially in the event of an overload, a thermal overload of the asynchronous motor can result. Furthermore, in order to prevent this situation, in the case of reference current, the tripping time is set as a parameter on the overcurrent release of the circuit breaker, from which tripping time is obtained depending on the flowing overload current until tripping The delay time for tripping the low voltage circuit breaker. Select the tripping time from the time band accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02H3/00
CPCH02H7/0816H02H3/006
Inventor 亨利·弗兰克贝恩德·施温
Owner SIEMENS AG