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surge protection device

A surge protection and surge technology, applied in the field of electricity, to avoid damage to electrical equipment

Active Publication Date: 2016-01-20
SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, the disadvantage of the prior art is that there is no surge protection device that specifically monitors the number of surge impacts that the varistor can withstand

Method used

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the drawings:

[0030] figure 1 It is a schematic circuit diagram of an embodiment of the present invention.

[0031] Please refer to figure 1 , The surge protection device of the present invention includes

[0032] The first varistor 802 connected in parallel between the live line L and the neutral line N of the power grid, and

[0033] The second varistor 902 connected in parallel between the neutral wire N and the ground wire PE of the power grid, and / or

[0034] The third varistor 904 connected in parallel between the live wire L and the ground wire PE of the power grid also includes

[0035] The first surge detection circuit 803 at the lower end of the first varistor 802 is connected in series to detect the number of surge impacts of the first varistor 802; and / or

[0036] A second surge detection circuit 903 connected in series to the lower end of the second varistor 902 and / or the third varistor 904 ...

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PUM

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Abstract

The invention discloses a surge protection device comprising a first voltage-sensitive resistor which is connected in parallel between a live line and a zero line of a power grid, a second voltage-sensitive resistor which is connected in parallel between the zero line and an earth line of the power grid, and a third voltage-sensitive resistor which is connected in parallel between the live line and the earth line of the power grid. The surge protection device also comprises a first surge detection circuit which is connected in series to the lower end of the first voltage-sensitive resistor and is used for detecting the number of surge impacts of the first voltage-sensitive resistor, a second surge detection circuit which is connected in series to the lower end of the second voltage-sensitive resistor and the lower end of the third second voltage-sensitive resistor and is used for detecting the number of the surge impacts of the second and / or the third voltage-sensitive resistor. The surge protection device can detect the number of the surge impacts so as to remind device maintenance staff to replace voltage-sensitive resistors with new ones timely so that the damage to electric-consuming devices caused by the voltage-sensitive resistor failure can be avoided.

Description

Technical field [0001] The invention relates to the field of electricity, and specifically to a surge protection device. Background technique [0002] Electric equipment can only be used after power on. The power supply of the electrical equipment is generally provided by the grid transmitted by the power system. The electrical equipment is connected to the grid to form an electronic circuit. When the grid or electronic circuit is struck by lightning, or when the electrical equipment is connected or disconnected from the grid, it will often generate an instantaneous overvoltage or overcurrent that is far greater than the grid voltage or current. This kind of instantaneous overvoltage and / or overcurrent is called surge. Especially when the load connected or disconnected from the grid is an inductive load or a large load, the surge generated will be higher. Electrical equipment connected to the power grid is likely to malfunction or be damaged after being impacted by a surge. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H3/04G01R19/17
Inventor 付裕
Owner SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD