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Undervoltage-overvoltage protection device and method

An overvoltage and overvoltage detection technology, which is used in emergency protection circuit devices, emergency protection devices that automatically disconnect, and protection that responds to overvoltages.

Active Publication Date: 2016-08-31
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This shortcoming obviously cannot meet the requirements of miniaturization and low cost of current protection devices.

Method used

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  • Undervoltage-overvoltage protection device and method
  • Undervoltage-overvoltage protection device and method
  • Undervoltage-overvoltage protection device and method

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Embodiment Construction

[0015] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0016] Figures 2A-2C , (hereinafter referred to as FIG. 2 ) exemplarily shows a schematic diagram of an undervoltage-overvoltage detection device according to an embodiment of the present invention. The undervoltage-overvoltage detection device according to one embodiment of the present invention generally triggers a tripping mechanism when overvoltage or undervoltage is detected in any phase of the three-phase line voltage, thereby prompting the circuit breaker 130 on the line to cut off in time Power connection.

[0017] Specifically, as shown in FIG. 2 , the tripping coil 110 can be connected in series on any one of the three AC phases. For example, as shown in FIG. 2 , it is connected in series on the live line L1 . The al...

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PUM

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Abstract

The invention discloses an undervoltage-overvoltage protection device which, for each of three alternating-current phases, comprises a sampling circuit used for obtaining a line sampling voltage of the alternating phase, an undervoltage detection circuit and three overvoltage detection circuits, wherein at least one of the overvoltage detection circuits comprises a voltage detection chip.

Description

technical field [0001] The invention relates to the field of power distribution system power supply, in particular to an undervoltage-overvoltage protection device and method. Background technique [0002] Generally speaking, the voltage on the power supply line is not a constant value, and it may fluctuate correspondingly due to the change of the load. Once this voltage fluctuation (such as undervoltage or overvoltage) on the power supply line exceeds the range that the electrical equipment can withstand, it will have an adverse effect on the electrical equipment, or even cause damage to the electrical equipment. Therefore, undervoltage protection and overvoltage protection devices are usually used to ensure that the electrical equipment operates in a normal power supply state. [0003] Undervoltage protection generally means that when the voltage of the power supply line is lower than a predetermined threshold (for example, lower than 80% of the nominal voltage), the prot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165H02H3/20H02H3/253
Inventor 包章尧杨林熊厚钰
Owner SIEMENS AG