Undervoltage-overvoltage protection device and method

An overvoltage and overvoltage detection technology, applied in the protection of under-voltage or no-voltage, and the protection of over-voltage, etc., to achieve the effect of reducing complexity, saving cost and power consumption, and reducing the number of

Inactive Publication Date: 2014-03-26
SIEMENS AG
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  • Abstract
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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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[0019] 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.

[0020] figure 2 A schematic diagram of an under-voltage-overvoltage detection device 200 according to an embodiment of the present invention is exemplarily shown. The detection device 200 according to one embodiment of the present invention generally drives a single tripping coil 120 to perform a tripping action when detecting overvoltage or undervoltage of a single-phase line voltage, thereby prompting the circuit breaker 130 on the line to cut off the power supply in time. Specifically, such as figure 2 As shown, the input of the detection device 200 is connected to a sampling circuit 190 . The sampling circuit 190 samples the line voltage to obtain the line sampling voltage V Line . The output of the detection device 200...

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Abstract

The invention provides an undervoltage-overvoltage protection device which comprises an overvoltage detection circuit, an undervoltage detection circuit, a conversion circuit and a switch element, wherein a trigger signal is generated after an input of the overvoltage detection circuit, higher than a first predetermined threshold is delayed, and a single-phase line sampling voltage is coupled to the input; the undervoltage detection circuit is used for generating an undervoltage indication signal when detecting that the line sampling voltage is lower than a second predetermined threshold; the conversion circuit is used for converting the undervoltage indication signal into a pseudo overvoltage output higher than the first predetermined threshold, and the pseudo overvoltage output is coupled to the input of the overvoltage detection circuit in a manner of being subjected to or operation together with the line sampling voltage; the switch element is conducted in response to the trigger signal, so that a tripping action is performed by a trip coil connected with the switch element.

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...

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Application Information

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IPC IPC(8): H02H3/24H02H3/20
Inventor 包章尧熊焘张红申杨林
Owner SIEMENS AG
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