CN205646796U - Mining monitoring substation surge protection circuit - Google Patents

Mining monitoring substation surge protection circuit Download PDF

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Publication number
CN205646796U
CN205646796U CN201620239014.3U CN201620239014U CN205646796U CN 205646796 U CN205646796 U CN 205646796U CN 201620239014 U CN201620239014 U CN 201620239014U CN 205646796 U CN205646796 U CN 205646796U
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China
Prior art keywords
protection circuit
tvs pipe
surge
surge protection
grade
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CN201620239014.3U
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Chinese (zh)
Inventor
温良
张子良
苗可彬
孟庆勇
叶锦娇
魏峰
赵华玮
贾晓娣
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China Coal Research Institute CCRI
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China Coal Research Institute CCRI
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Abstract

The utility model discloses a mining monitoring substation surge protection circuit installs in mining monitoring substation power entrance, its characterized in that adopts the two -stage protection circuit, and TVS pipe D2 connects in parallel and carry out the differential mode protection between VCC and GND in the 1st grade, and VCC and GND connect shell PE to carry out the common mode protection after connecing piezo -resistor to establish ties with gas discharge tube GDT more respectively, the 2nd grade is adopted TVS pipe D3 further to protect, and series connection differential mode choke L1, L2 do the buffering time delay in the middle of the two -stage, and control switches on the chronogenesis. The utility model discloses a circuit is applicable to the colliery, accords with the colliery and to the requirement of the withstand voltage ann's of the waiting rule of this ampere of insulation of equipment, can realize the test of 3 grades experimental harsh grades of surge impact noise immunity, and level circuit behind the protective monitoring substation makes its normal work under the surge impact disturbs effectively.

Description

A kind of mine monitoring substation surge protection circuit
Technical field
This utility model relates to a kind of mine monitoring substation surge protection circuit, belongs to colliery electromagnetic compatibility Anti-Jamming Technique field.
Background technology
At main equipment switches such as underground coal mine power cable control equipment start-stop, large-scale relay on-offs The change of transient state all can produce certain surge interference, and surge impact easily causes mine monitoring substation Automatically reset, the phenomenons such as short time communication abnormality even quits work occur.
And the antisurge impact protection circuit of routine is not particularly suited for colliery product, because colliery industry sets Standby application has some particularitys of self, as intrinsically safe equipment requires internal energy-storage travelling wave tube electric capacity With the requirement that inductance has to comply with GB3836.4-2010, it is impossible in order to circuit performance selects numerical value any Big electric capacity and inductance, intrinsically safe equipment requires must to be fulfilled for insulation voltage between shell and circuit Requirement, it is impossible to simply circuit is directly connected to shell etc..
In coal mine safety monitoring system industry standard, " AQ6201 coal mine safety monitoring system current techique is wanted Ask " system of explicitly pointing out should be able to be specified by GB/T 17626.5-1999 in 4.11 interference free performances Harsh grade is surge (impact) immunity experiment of 3 grades.I.e. mine monitoring substation is meeting power frequency The impact of 2kV surge voltage is met while 500V insulation is pressure.
Utility model content
This utility model provides a kind of mine monitoring substation surge protection circuit, and its design is in mining monitoring At the power interface of substation, the antisurge impact of outstation can be realized, and meet the safety in colliery Requirement.
For reaching this purpose, this utility model by the following technical solutions:
A kind of mine monitoring substation surge protection circuit, is installed on mining monitoring substation power porch, Using dual-electrode protecting circuit, in the 1st grade, TVS pipe D2 is parallel between VCC and GND carry out differential mode Protection, VCC and GND connects varistor respectively and connects with gas-discharge tube GDT and be followed by shell PE and enter Row common mode is protected;2nd grade uses TVS pipe D3 to protect further, series connection differential mode inductance in the middle of two-stage L1, L2 do buffering time delay, control conducting sequential.
In described 2nd grade of protection circuit, it is serially connected with resettable fuse PTC carries out overcurrent protection, make Protect relatively reliable.
It is serially connected with counnter attack diode D1 in described 2nd grade of protection circuit.
Described TVS pipe D2 and TVS pipe D3 are the high-power TVS pipe of 6kW, have differential mode surge punching Hit 2kV barrier propterty.
Described 1st grade of protection circuit bridges to have between VCC and GND two line and shell PE and meets peace Y capacitance C2 of rule, C3.
At described TVS pipe D2 two ends parallel connection X electric capacity C1.
At described TVS pipe D3 two ends parallel connection X electric capacity C4.
Compared with prior art, the beneficial effects of the utility model are:
1, circuit of the present utility model is applicable to colliery, meets colliery apparatus insulated pressure etc. for intrinsic safety Safety requirement.
2, the test that can realize the harsh grade of surge impact immunity experiment 3 grades of the present utility model, can Protection outstation late-class circuit effectively so that it is normally work under surge impact disturbs.
Accompanying drawing explanation
Below according to drawings and Examples, this utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
Further illustrate technical side of the present utility model below in conjunction with the accompanying drawings and by detailed description of the invention Case, embodiment of the present utility model includes but not limited to the following example.
A kind of mine monitoring substation surge protection circuit as shown in Figure 1, is installed on mining monitoring substation At power import, use dual-electrode protecting circuit, including: TVS pipe, varistor, gas-discharge tube, Differential mode inductance, X electric capacity, Y capacitance, diode, resettable fuse.1st grade of employing is high-power TVS pipe D2 is parallel between VCC and GND carry out differential mode protection, VCC and GND connects pressure-sensitive electricity respectively Resistance is connected with gas-discharge tube GDT and is followed by shell PE and carries out common mode protection, and C1 is X electric capacity, C2, C3 is Y capacitance and uses safety electric capacity;2nd grade uses TVS pipe D3 to protect further, by residual voltage Continuing to reduce, resettable fuse PTC then carries out overcurrent protection;With poor between 1st grade and the 2nd grade Mould inductance L1, L2 do buffering time delay, control conducting sequential, and D1 is counnter attack diode, and C4 is still X Electric capacity.
Gas-discharge tube GDT one end is connected with varistor R1 and R2, and another terminates substation shell PE, The power frequency insulation achieving 500V while having common mode carrying out surge protection performance is pressure.
Use the high-power TVS of 6kW between VCC and GND, there is differential mode surge impact 2kV barrier propterty.
Use and two class protection, and two-stage use differential mode inductance L1, L2 control conducting sequential.
2nd grade of protection TVS pipe D3 reduces residual voltage further, and resettable fuse PTC supplemented Stream defencive function, makes protection relatively reliable.
The work process of the present embodiment is as follows
In this utility model, TVS pipe D2 is parallel to both ends of power, when differential mode surge impact, its Meeting transient switching, surge energy of releasing, clamp input voltage.And common mode is protected by varistor, gas Body discharge tube and Y capacitance composition, varistor and gas-discharge tube series connection, can reduce leakage current, choosing Take suitable parameter and can meet common mode carrying out surge protection and the requirement of 500V industrial frequency withstand voltage, Y in parallel simultaneously Electric capacity can shorten the response time.Through the buffering time delay of differential mode inductance L1, L2, TVS pipe D3 is delayed Conducting, reduces residual voltage further, and PTC then plays metering function, and when electric current increases, PTC temperature raises, Resistance becomes big, then makes electric current reduce, thus protects late-class circuit.
According to the above embodiments, can well complete this utility model.
Being embodiment of the present utility model as mentioned above, this utility model is not limited to above-mentioned embodiment party Formula, anyone should learn the structure change made under enlightenment of the present utility model, every and this reality With novel, there is same or like technical scheme, within each falling within protection domain of the present utility model.

Claims (7)

1. a mine monitoring substation surge protection circuit, is installed on mining monitoring substation power porch, It is characterized in that, using dual-electrode protecting circuit, in the 1st grade, TVS pipe D2 is parallel to VCC and GND Between carry out differential mode protection, VCC and GND connects after varistor connects with gas-discharge tube GDT more respectively Meet shell PE and carry out common mode protection;2nd grade uses TVS pipe D3 to protect further, string in the middle of two-stage Connection differential mode inductance L1, L2 do buffering time delay, control conducting sequential.
Surge protection circuit the most according to claim 1, it is characterised in that the described 2nd Level protection circuit is serially connected with resettable fuse PTC and carries out overcurrent protection.
Surge protection circuit the most according to claim 1, it is characterised in that the described 2nd Level protection circuit is serially connected with counnter attack diode D1.
Surge protection circuit the most according to claim 1, it is characterised in that described TVS pipe D2 and TVS pipe D3 are the high-power TVS pipe of 6kW, have differential mode surge impact 2kV barrier propterty.
5. according to any one surge protection circuit described in Claims 1-4, it is characterised in that In described 1st grade of protection circuit, between VCC and GND two line and shell PE, bridging has the Y meeting safety Electric capacity C2, C3.
6. according to any one surge protection circuit described in Claims 1-4, it is characterised in that Described TVS pipe D2 two ends parallel connection X electric capacity C1.
7. according to any one surge protection circuit described in Claims 1-4, it is characterised in that Described TVS pipe D3 two ends parallel connection X electric capacity C4.
CN201620239014.3U 2016-03-25 2016-03-25 Mining monitoring substation surge protection circuit Active CN205646796U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620239014.3U CN205646796U (en) 2016-03-25 2016-03-25 Mining monitoring substation surge protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620239014.3U CN205646796U (en) 2016-03-25 2016-03-25 Mining monitoring substation surge protection circuit

Publications (1)

Publication Number Publication Date
CN205646796U true CN205646796U (en) 2016-10-12

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CN201620239014.3U Active CN205646796U (en) 2016-03-25 2016-03-25 Mining monitoring substation surge protection circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656015A (en) * 2016-03-25 2016-06-08 煤炭科学技术研究院有限公司 Mining monitoring substation surge protection circuit
CN114583940A (en) * 2022-05-09 2022-06-03 深圳市高斯宝电气技术有限公司 Power-off circuit of low-voltage direct-current power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656015A (en) * 2016-03-25 2016-06-08 煤炭科学技术研究院有限公司 Mining monitoring substation surge protection circuit
CN114583940A (en) * 2022-05-09 2022-06-03 深圳市高斯宝电气技术有限公司 Power-off circuit of low-voltage direct-current power supply

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