Multifunctional fireproof short-circuit protector with redundant device

A short-circuit protector and redundant device technology, which is applied in the direction of overcurrent protection, circuit device, emergency protection circuit device, etc., can solve the problem of single function, etc., and achieve the effect of improved breaking time and high reliability

Active Publication Date: 2014-04-23
SHANGHAI HUASU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the known high-speed short-circuit protector products of the same type as the present invention, because there are no additional f

Method used

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  • Multifunctional fireproof short-circuit protector with redundant device
  • Multifunctional fireproof short-circuit protector with redundant device
  • Multifunctional fireproof short-circuit protector with redundant device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one: if image 3 As shown, wherein, when the device is working normally, the signal of the precision low-resistance non-inductive resistor is sent to the digital signal processor 3 after being isolated by the first photocoupler 11, and the digital signal processor 3 simultaneously samples information such as the input voltage phase, and passes through The digital signal processor 3 internal calculation processing, when the load 8 does not have a short circuit or overload abnormal situation, the digital signal processor 3 sends a closing signal to the isolation drive module 5, and the drive module opens the high-current power module 4, the path of the high-current power module 4 Open; under normal circumstances, the coil path from the digital signal processor 3 to the controlled mechanical switch does not act, and the short circuit mechanism of the controlled mechanical switch itself does not trip, so the controlled mechanical switch is also in a closed state, ...

Embodiment 2

[0037] Embodiment two: if Figure 4 As shown, when the load 8 is short-circuited, the signal of the precision low-resistance non-inductive resistor is amplified and isolated and then input to the digital signal processor 3. When the digital signal processor 3 determines that it is a true short-circuit signal through multiple conditional calculations, it sends out a disconnection signal The isolated drive module 5 cuts off the high-current power module 4 connected in series with the load 8 circuits instantly, and at the same time the mechanical switch control terminal of the digital signal processor 3 outputs a signal, the controlled mechanical switch coil is energized, and the power module connected in series with the load 8 circuits The mechanical contact is disconnected to realize the physical disconnection of input and output---this can effectively avoid the leakage current pair caused by the increase of electron-hole pairs inside the semiconductor high-current power module ...

Embodiment 3

[0041] Embodiment three: as Figure 5As shown, in the worst case, when the high-power current module 4 is broken down and short-circuited, even if the digital signal processor 3 sends a disconnection signal, the high-power current module 4 will not be disconnected, if at this time the digital signal processor 3 It is also damaged for some reason. At this time, the signal of the isolated drive module 5, the signal of the controlled mechanical switch, and the charge absorption circuit 7 are equivalent to failure. At this time, if the load 8 is short-circuited or overloaded, due to the rapid increase of the short-circuit current, As a result, the magnetic force of the induction coil inside the controlled mechanical switch is enhanced and the internal mechanical valve is attracted, causing the controlled mechanical switch connected in series in the load 8 circuit to trip, and the abnormal current of the load 8 is cut off. The controlled mechanical switch is controlled by two signa...

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Abstract

The invention relates to the technical field of an electric short-circuit protection device, in particular to a multifunctional fireproof short-circuit protector with a redundant device. The multifunctional fireproof short-circuit protector comprises a switch power supply, a current sampling device, a digital signal processor, a large-current power module, an isolation driving module, a redundant device, a charge absorption circuit and a load; the redundant device is a controlled mechanical switch, and an end L of an alternating-current power 220V is respectively connected with a resistor R1, the input end of the switch power supply, the input end of a differential amplifier and one end of the current sampling device. The multifunctional fireproof short-circuit protector is used in different alternating-current strong current fields such as household power, industrial power and the like, when the load is short-circuited, the abnormal power supply circuit is disconnected instantaneously at a microsecond speed, and no dangerous spark is produced on the short-circuit position; when the abnormal situation such as electric leakage happens in an electrical loop, the electric-leakage circuit is also disconnected at a high speed by the device; through the redundant device, even when the extreme situation that the large-power current module or the digital signal processor is abnormal occurs, the reliability of the device also can be guaranteed.

Description

Technical field: [0001] The invention relates to the technical field of electrical short circuit protection equipment, in particular to a multifunctional fireproof short circuit protector with redundant devices. Background technique: [0002] In recent years, with the rapid growth of my country's national economy and the continuous improvement of people's living standards, the society's demand for electricity has continued to grow year by year. Household appliances, agriculture, industry and other occasions are almost inseparable from electric energy; the demand for electricity continues to grow In the context of the current situation, how to ensure safe use of electricity and other issues have also become prominent. According to incomplete statistics, after the investigation of many fire accidents, it was found that electrical fires caused by electrical short circuits, leakage, and arcing have always been the primary factor in causing accidents. , poses a serious threat to th...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02H3/05
Inventor 谢模顺
Owner SHANGHAI HUASU ELECTRIC
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