CN207910447U - A kind of active protection device for arc faults of switchgear - Google Patents
A kind of active protection device for arc faults of switchgear Download PDFInfo
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- CN207910447U CN207910447U CN201820227563.8U CN201820227563U CN207910447U CN 207910447 U CN207910447 U CN 207910447U CN 201820227563 U CN201820227563 U CN 201820227563U CN 207910447 U CN207910447 U CN 207910447U
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Abstract
The utility model is related to arc protection device technical field, especially a kind of active protection device for arc faults of switchgear；Including current signal sampling module, signal acquisition input pin and the high voltage power transmission and transforming connection of the current signal sampling module；The current signal sampling module output end is connect with signal amplification module, the signal amplification module output end is connect with A/D modules, the A/D module output ends are connect with control module, the control module is also connect with reseting module, buzzer, LED indication module and trigger module, the execution unit of the trigger module and breaker connects, and the execution unit is located in the phase line of power transmission and transformation line；The active protection device for arc faults of the switchgear further includes DC power supplier.The utility model judges the harmfulness of electric arc by the way of calculating the root-mean-square value of accumulated energy and electric current, the advantageous effect high with precision, accuracy is high, and circuit is simple, and practical value is high.
Description
Technical field
The utility model is related to arc protection device technical fields, and in particular to a kind of active arc fault guarantor of switchgear
Protection unit.
Background technology
With the rapid development of economy and being gradually increased for living standards of the people, the electricity consumption of the whole society is also constantly increasing
Add.Electrical Safety, including personal safety and prevent electric leakage or arc fault caused by fire, be increasingly subject to the attention of people.Its
Fire caused by middle arc fault accounts for 60% or more in all electrical fires, therefore people are to low-voltage electrical safety and electric arc event
The attention degree of barrier protection is gradually increased.
Electric arc is the continuous discharge phenomenon that certain dielectric is crossed between two electrodes, is often accompanied with the office of electrode
It volatilizees in portion.Typically electric arc is formed in the airspace between yin, yang the two poles of the earth.Arc center's temperature be generally 5000 to
15000℃.Region existing for electric arc will produce very high ionization air pressure, can all be released from anywhere in causing electric arc to be confined
Hot gas and electrode substance particle.
Electric arc on circuit can be divided into two kinds, and one is normal operation arcs, and it is fault electric arc to claim " good arc " another kind,
Claim " bad arc "." good arc " refers to the arc that motor rotation (such as electric drill, dust catcher) generates, in addition when people's device for switching, plug
The arc generated when electric appliance also belongs to " good arc "." bad arc " is fault electric arc, and fault electric arc generally results from two kinds of situations：1. edge
Insulator portion conductive surface；2. resulting from two very close electrodes.The former is heated or is occurred for a long time due to insulator
Contingency electric spark causes insulating surface to be carbonized and form arc channel；The latter runs into ground conduit or one due to electric conductor
Insulation is hurt by sharp metallic object in part in beam conductor.In low pressure power and distribution supply cable, there are series arc faults, Line To Line
Arc fault and line arc fault over the ground.
The arc fault of switchgear is generally protected using breaker in power transmission and transformation line in the prior art, but single
It is pure by breaker come act there are after the delay of breaker identification insensitive, breaker actuation and breaker actuation must it is artificial on
Electricity can just be again switched on circuit.In view of inconvenience in the prior art, a kind of active arc fault of switchgear how is designed
Protective device is to solve to rely on the inconvenience of breaker and the lower problem of the degree of automation merely in the prior art to be ability
Field technique personnel's technical issues that need to address.
Utility model content
The purpose of this utility model be in order to switchgear merely by breaker come act there are breaker identification it is insensitive,
Breaker actuation postpones and must manually power on just the problem that can be again switched on circuit after breaker actuation, and proposes a kind of switch
The active protection device for arc faults of cabinet.
To achieve the goals above, the utility model uses following technical solution：
Design a kind of active protection device for arc faults of switchgear, including current signal sampling module, the electric current
The signal acquisition input pin of signal sampling module forms current signal sampling module and high pressure with high voltage power transmission and transforming connection
The form of power transmission and transformation line parallel connection；The current signal sampling module output end is connect with signal amplification module, for defeated
The current signal entered is amplified operation, and the signal amplification module output end is connect with A/D modules, the mould for that will input
Quasi- signal is transformed to digital signal, and the A/D module output ends are connect with control module, the control module also with reset
Module, buzzer, LED indication module are connected with trigger module, the execution unit connection of the trigger module and breaker, institute
The execution unit stated is located in the phase line of power transmission and transformation line；
The active protection device for arc faults of the switchgear further includes DC power supplier, the DC power supply mould
Block is used to power to current signal sampling module, signal amplification module, A/D modules and control module.
Operation principle：Current signal collection module acquires the current parameters on power transmission and transformation line, by becoming to current parameters
The analysis of change is acted accordingly to judge switchgear arc phenomenon to the extent of injury of equipment；Current signal acquires first
Module acquisition signal through amplification, A/D conversion after be transmitted in control module, control module according to the current change quantity of reception come
The root-mean-square value of accumulated energy and electric current, that is, virtual value are calculated, is then compared according to the numerical value of calculating and action limit value
Right, when the root-mean-square value of accumulated energy and electric current is all higher than limit value, control module adjusts trigger module action, by trigger module
Execution unit is triggered, so that the execution unit of breaker is executed corresponding opening operation protective device danger against damages is come with this
Danger.
More preferred, the control module is also connect with testing button, for receiving test signal and believing test
Number feed back to the input terminal of signal amplification module.
More preferred, the execution unit is de- mouth contact.
More preferred, the current signal sampling module acquires the input current of three-phase power transmission and transformation line respectively.
More preferred, the three-phase power transmission and transformation line is all provided with that there are one execution units.
The utility model proposes a kind of active protection device for arc faults of switchgear, advantageous effect is：（1）This reality
The root-mean-square value of its accumulated energy of sampling analysis and electric current is carried out with the novel current signal by power transmission and transformation line to judge
Whether it produces arc phenomenon and judges the danger of electric arc according to the size of the accumulated energy of calculating and the root-mean-square value of electric current
It is dangerous and in this, as reaching intelligent, actively to adjust the action situation of execution unit according to controlling trigger module by controller
The effect of protection；（2）The utility model judges the danger of electric arc by the way of calculating the root-mean-square value of accumulated energy and electric current
Evil property, the advantageous effect high with precision, accuracy is high, and circuit is simple, practical value is high.
Description of the drawings
The utility model is described in further detail for embodiment in below in conjunction with the accompanying drawings, but does not constitute to this reality
With novel any restrictions.
Fig. 1 is the structural schematic diagram of utility model device；
Fig. 2 is the flow diagram of utility model device work.
In figure：Current signal sampling module 1, signal amplification module 2, A/D modules 3, control module 4, reseting module 5, bee
Ring device 6, LED indication module 7, trigger module 8, execution unit 9, DC power supplier 10, testing button 11.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
Shown in attached drawing 1, a kind of active protection device for arc faults of switchgear of the utility model, including electric current letter
Number sampling module 1, signal acquisition input pin and the high voltage power transmission and transforming connection of the current signal sampling module 1 are formed
The form of current signal sampling module 1 and high voltage power transmission and transforming lines in parallel, the current signal sampling module 1 acquire three respectively
The input current of phase power transmission and transformation line；1 output end of current signal sampling module is connect with signal amplification module 2, is used for
Operation is amplified to the current signal of input, 2 output end of signal amplification module is connect with A/D modules 3, and being used for will be defeated
The analog signal entered is transformed to digital signal, and 3 output end of A/D modules is connect with control module 4, the control module
4 also connect with reseting module 5, buzzer 6, LED indication module 7 and trigger module 8, the trigger module 8 and breaker
Execution unit 9 connects, and the execution unit 9 is located in the phase line of power transmission and transformation line, and the execution unit 9 is that de- mouth touches
Point, the three-phase power transmission and transformation line are all provided with there are one execution unit 9.
The active protection device for arc faults of the switchgear further includes DC power supplier 10, the DC power supply
Module 10 is used to power to current signal sampling module 1, signal amplification module 2, A/D modules 3 and control module 4；The control
Molding block 4 is also connect with testing button 11, for receiving test signal and test signal being fed back to the defeated of signal amplification module 2
Enter end.
Operation principle：Shown in attached drawing 1- attached drawings 2, the current signal collection module 1 of utility model device acquires defeated
Become the current parameters in electric line, harm of the switchgear arc phenomenon to equipment is judged by the analysis changed to current parameters
Degree is accordingly acted；The signal that current signal collection module 1 acquires first is transmitted to control after amplification, A/D conversions
In molding block 4, control module 4 calculates the root-mean-square value of accumulated energy and electric current according to the current change quantity of reception, that is,
Then virtual value is compared according to the numerical value of calculating and action limit value, when the root-mean-square value of accumulated energy and electric current is all higher than
When limit value, control module 4 adjusts trigger module 8 and acts, and triggers execution unit 9 by trigger module 8, makes the enforcement division of breaker
Part 9 executes corresponding opening operation and carrys out protective device danger against damages with this.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not
Be confined to this, any one skilled in the art within the technical scope disclosed by the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (5)
1. a kind of active protection device for arc faults of switchgear, which is characterized in that including current signal sampling module（1）, institute
The current signal sampling module stated（1）Signal acquisition input pin and high voltage power transmission and transforming connection form current signal sampling
Module（1）With the form of high voltage power transmission and transforming lines in parallel；The current signal sampling module（1）Output end amplifies mould with signal
Block（2）Connection, operation, the signal amplification module are amplified for the current signal to input（2）Output end and A/D moulds
Block（3）Connection, for the analog signal of input to be transformed to digital signal, the A/D modules（3）Output end and control module
（4）Connection, the control module（4）Also with reseting module（5）, buzzer（6）, LED indication module（7）And trigger module
（8）Connection, the trigger module（8）With the execution unit of breaker（9）Connection, the execution unit（9）It is located at defeated change
In the phase line of electric line；
The active protection device for arc faults of the switchgear further includes DC power supplier（10）, the DC power supply mould
Block（10）For giving current signal sampling module（1）, signal amplification module（2）, A/D modules（3）And control module（4）Power supply.
2. the active protection device for arc faults of a kind of switchgear according to claim 1, which is characterized in that the control
Molding block（4）Also with testing button（11）Connection, for receiving test signal and test signal being fed back to signal amplification module
（2）Input terminal.
3. the active protection device for arc faults of a kind of switchgear according to claim 1, which is characterized in that described holds
Row component（9）To take off mouth contact.
4. the active protection device for arc faults of a kind of switchgear according to claim 1, which is characterized in that the electricity
Flow signal sampling module（1）The input current of three-phase power transmission and transformation line is acquired respectively.
5. the active protection device for arc faults of a kind of switchgear according to claim 4, which is characterized in that described three
Phase power transmission and transformation line is all provided with there are one execution unit（9）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820227563.8U CN207910447U (en) | 2018-02-09 | 2018-02-09 | A kind of active protection device for arc faults of switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820227563.8U CN207910447U (en) | 2018-02-09 | 2018-02-09 | A kind of active protection device for arc faults of switchgear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207910447U true CN207910447U (en) | 2018-09-25 |
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ID=63560539
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820227563.8U Active CN207910447U (en) | 2018-02-09 | 2018-02-09 | A kind of active protection device for arc faults of switchgear |
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| CN (1) | CN207910447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175204A (en) * | 2020-01-16 | 2020-05-19 | 国网天津市电力公司电力科学研究院 | Method for monitoring particulate matters and abnormal components in air inside switch cabinet |
-
2018
- 2018-02-09 CN CN201820227563.8U patent/CN207910447U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175204A (en) * | 2020-01-16 | 2020-05-19 | 国网天津市电力公司电力科学研究院 | Method for monitoring particulate matters and abnormal components in air inside switch cabinet |
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