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Electrical device and method for determining a phase failure in the electrical device

A technology of electrical equipment and phase failure, which is applied in the direction of indicating the existence of current/voltage, measuring current/voltage, instruments, etc., to achieve the effect of cost saving

Active Publication Date: 2013-07-24
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However here it is problematic when there is no converter in the line (phase) of the converter
Therefore a phase failure in the line without the converter cannot be recognized and the motor will continue to run on both phases until another protective mechanism de-energizes the motor

Method used

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  • Electrical device and method for determining a phase failure in the electrical device
  • Electrical device and method for determining a phase failure in the electrical device
  • Electrical device and method for determining a phase failure in the electrical device

Examples

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Embodiment Construction

[0061] figure 1 A schematic illustration of an electrical device 1 is shown, which is connected to a three-phase AC motor 2 . The three phases of the AC motor 2 are connected to the power supply network through the electrical equipment 1 , so that the AC motor 2 can be powered. The electrical device 1 described here is a soft starter device 1 . The soft starter 1 has, for each phase, an input-side connection point 3 and an output-side connection point 4 , which are electrically conductively connectable to one another by means of internal lines 6 , 7 , 8 of the soft starter.

[0062] The energy provided for the AC motor is supplied from the supply network into the soft starter 1 via a line 5 connected on the output side. Energy is transferred to the three-phase AC motor 2 via an external line 5 connected to the output-side connection point 4 . Therefore, the soft start device 1 has three phases. The first line 6 of the soft starter 1 reflects here the first phase of the sys...

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PUM

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Abstract

The invention relates to a method for determining a phase failure in an electrical device (1) for driving or monitoring a three-phase AC motor (2), wherein the electrical device (1) comprises a first, a second and a third line (6,7,8). In order to detect a phase failure in a line (8) in the three-phase electrical device (1), in particular in a soft starter (1), the phase failure in the third line (8) is determined by analysing the first and second lines (6,7), wherein the analysis comprises the following steps: determining a value which characterizes a phase shift between a current in the first and second lines (6,7), and outputting a signal if the value which has been determined is in a range of values which characterizes a phase failure in the third line (8).

Description

technical field [0001] The invention relates to a method for determining a phase failure in an electrical installation and to an electrical installation with which a phase failure in an electrical installation can be determined. Background technique [0002] In the field of industrial automation technology, electrical devices such as soft starter devices, overload relay devices or motor starters are used for controlling or monitoring three-phase AC motors. [0003] For electric soft starters for AC motors, 2-phase controlled soft starters are used in addition to three-phase controlled soft starters (three-phase AC governors). In three-phase controlled soft starters there are usually current transformers for controlling and measuring the currents in the three lines (phases) of the soft starter. In a 2-phase controlled soft starter, one of the three lines (phases) of the soft starter is bridged and in principle the converter (in the bridged line) can be dispensed with in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/145G01R19/155G01R19/165
CPCG01R19/16547G01R29/18H02K11/001G01R19/155G01R19/165G01R19/145H02K11/20
Inventor 迪尔克·赫兹马尔科·舍嫩伯格约翰·塞茨斯特凡·齐茨勒
Owner SIEMENS AG