CN103187718A - Protection device of central processing unit of power distribution cabinet - Google Patents
Protection device of central processing unit of power distribution cabinet Download PDFInfo
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- CN103187718A CN103187718A CN 201110453072 CN201110453072A CN103187718A CN 103187718 A CN103187718 A CN 103187718A CN 201110453072 CN201110453072 CN 201110453072 CN 201110453072 A CN201110453072 A CN 201110453072A CN 103187718 A CN103187718 A CN 103187718A
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- processing unit
- central processing
- distribution cabinet
- power distribution
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Abstract
The invention relates to a protection device of a central processing unit of a power distribution cabinet. The protection device comprises a signal transmission circuit and a shunt detection circuit; the signal transmission circuit comprises a current-limiting resistor and a control switch which are connected in series; the shunt detection circuit comprises a shunt resistor and an abnormal current detection device which are connected in series; the abnormal current detection device comprises two output lines, one output line is connected with the control switch, and the other output line is connected with the central processing unit; and a built-in power supply is further arranged in the protection device of the central processing unit of the power distribution cabinet, and the built-in power supply is connected with the abnormal current detection device. The protection device has the advantages of being capable of timely detecting abnormal current and protecting the central processing unit of the power distribution cabinet.
Description
Technical field
The invention belongs to power distribution cabinet maintenance technology field, relate in particular to a kind of power distribution cabinet central processing unit protective device.
Background technology
Power distribution cabinet is widely used in electric energy conversion and the control of every field such as electric power, finance, communication, industrial and mining enterprises, and novel power distribution cabinet is provided with central processing unit in the market, and this novel power distribution cabinet has little, the low power consumption and other advantages of volume.Central processing unit will exchange the information of input module collection and unify effective analysis, assign command adapted thereto according to analysis result to each Executive Module then.Therefore, central processing unit has crucial effects as " analysis center " of power distribution cabinet.
Patent documentation " low-voltage distribution cabinet " (patent No. CN201120028679.7) discloses a kind of low-voltage distribution cabinet that has microprocessor module.The microprocessor module of this utility model will instruct to send actuator, human-computer interaction module or alarm module etc. respectively to after will exchanging unified analysis of AC signal of input module collection, bring into play the effect of central processing unit.But, when distribution system or voltage occur when unusual, to produce abnormal current, exchange input module and directly send the abnormal current signal that collects to central processing unit, possibly central processing unit is caused damage, not only cause each module of power distribution cabinet normally not move, more can't give the alarm by alarm module.Therefore, need take safeguard measure to central processing unit, could guarantee the normal operation of each module of power distribution cabinet.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can in time distinguish abnormal current, the protection central processing unit is not damaged because current anomaly changes, and the power distribution cabinet central processing unit protective device that gives the alarm simultaneously.
To achieve these goals, the technical solution used in the present invention is: a kind of power distribution cabinet central processing unit protective device is characterized in that: comprise signal transfer circuit and divide current detection circuit; Described signal transfer circuit comprises current-limiting resistance and the control switch of series connection; Described minute current detection circuit comprises shunt resistance and the abnormal current checkout gear of series connection; Described abnormal current checkout gear comprises two outlet lines, and one links to each other with described control switch, and another is connected with central processing unit; Described power distribution cabinet central processing unit protective device also is provided with built-in power, links to each other with described abnormal current checkout gear.
Further, the resistance of described shunt resistance be the current-limiting resistance resistance 2-5 doubly.
Operation principle of the present invention is: exchange input module the AC signal that collects is inputed to power distribution cabinet central processing unit protective device; AC signal is divided into two-way and transmits; one the tunnel is sent to central processing unit analysis by control switch after the current-limiting resistance current limliting, another road is delivered to the abnormal current checkout gear through shunt resistance.During no abnormal electric current, control switch closure, AC signal normally transmit in transfer circuit.When the system failure or electric voltage exception increase, to produce abnormal current, after abnormal current enters the branch current detection circuit, the abnormal current checkout gear is judged this current anomaly according to the current threshold that sets, and output two-way command signal: one tunnel command signal is sent to control switch and makes its disconnection, and resistance abnormal current signal flows into central processing unit; To the note abnormalities information of electric current of another road command signal directly sends central processing unit to, and assigns the instruction that gives the alarm to warning device by central processing unit.
The invention has the beneficial effects as follows: power distribution cabinet central processing unit protective device of the present invention; can in time differentiate the abnormal current signal by minute current detection circuit; the blocking-up abnormal current enters central processing unit, and gives the alarm simultaneously, has effectively protected the power distribution cabinet central processing unit.
Description of drawings
Fig. 1 is work schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing a kind of embodiment of power distribution cabinet central processing unit protective device of the present invention is made brief description.
A kind of power distribution cabinet central processing unit protective device comprises signal transfer circuit and divides current detection circuit as shown in Figure 1; Described signal transfer circuit comprises current-limiting resistance R and the control switch K of series connection; Described minute current detection circuit comprises shunt resistance R1 and the abnormal current checkout gear IC of series connection; Described abnormal current checkout gear IC comprises two outlet lines, and one links to each other with described control switch K, and another is connected with central processing unit; Described power distribution cabinet central processing unit protective device also is provided with built-in power S, links to each other with described abnormal current checkout gear IC.
Further, the resistance of described shunt resistance R1 be current-limiting resistance R resistance 2-5 doubly.
A specific embodiment of the present invention is as follows:
1, exchanges input module the AC signal that collects is inputed to power distribution cabinet central processing unit protective device, AC signal is divided into two-way and transmits, one the tunnel is sent to central processing unit analysis by control switch K after current-limiting resistance R current limliting, another road is delivered to abnormal current checkout gear IC through shunt resistance;
2, during no abnormal electric current, control switch K closure, AC signal normally transmit in transfer circuit, and abnormal current checkout gear IC does not have the output of instruction signal;
3, when the system failure or electric voltage exception increase, to produce abnormal current, after abnormal current enters the branch current detection circuit, abnormal current checkout gear IC judges this current anomaly according to the current threshold that sets, and output two-way command signal: one tunnel command signal is sent to control switch K and makes its disconnection, and resistance abnormal current signal flows into central processing unit; To the note abnormalities information of electric current of another road command signal directly sends central processing unit to, and assigns the instruction that gives the alarm to warning device by central processing unit.
Claims (2)
1. a power distribution cabinet central processing unit protective device is characterized in that: comprise signal transfer circuit and divide current detection circuit; Described signal transfer circuit comprises current-limiting resistance and the control switch of series connection; Described minute current detection circuit comprises shunt resistance and the abnormal current checkout gear of series connection; Described abnormal current checkout gear comprises two outlet lines, and one links to each other with described control switch, and another is connected with central processing unit; Described power distribution cabinet central processing unit protective device also is provided with built-in power, links to each other with described abnormal current checkout gear.
2. power distribution cabinet central processing unit protective device according to claim 1 is characterized in that: the resistance of described shunt resistance be the current-limiting resistance resistance 2-5 doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110453072 CN103187718A (en) | 2011-12-30 | 2011-12-30 | Protection device of central processing unit of power distribution cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110453072 CN103187718A (en) | 2011-12-30 | 2011-12-30 | Protection device of central processing unit of power distribution cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103187718A true CN103187718A (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110453072 Pending CN103187718A (en) | 2011-12-30 | 2011-12-30 | Protection device of central processing unit of power distribution cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103187718A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577949A (en) * | 2013-10-29 | 2015-04-29 | 三菱电机株式会社 | Semiconductor device |
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2011
- 2011-12-30 CN CN 201110453072 patent/CN103187718A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577949A (en) * | 2013-10-29 | 2015-04-29 | 三菱电机株式会社 | Semiconductor device |
| US9647443B2 (en) | 2013-10-29 | 2017-05-09 | Mitsubishi Electric Corporation | Semiconductor device |
| CN104577949B (en) * | 2013-10-29 | 2019-06-28 | 三菱电机株式会社 | Semiconductor device |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130703 |