CN207339261U - A kind of overvoltage protection device for preventing high pressure from sealing in electrification display - Google Patents
A kind of overvoltage protection device for preventing high pressure from sealing in electrification display Download PDFInfo
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- CN207339261U CN207339261U CN201721370991.8U CN201721370991U CN207339261U CN 207339261 U CN207339261 U CN 207339261U CN 201721370991 U CN201721370991 U CN 201721370991U CN 207339261 U CN207339261 U CN 207339261U
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- protection device
- overvoltage protection
- high pressure
- electrification display
- sealing
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- 238000007789 sealing Methods 0.000 title claims abstract description 18
- 230000001629 suppression Effects 0.000 claims abstract description 9
- 230000001052 transient effect Effects 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 4
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 230000001012 protector Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The utility model provides a kind of overvoltage protection device for preventing high pressure from sealing in electrification display, including high pressure sensor and electrification display, overvoltage protection device is provided between the high pressure sensor and electrification display, the overvoltage protection device divides three-phase input and three-phase to export using deposited copper circuit board, in three-phase circuit two level current limiting resistance R1 and R2 are concatenated per one-phase circuit, R1 and R2 are serially connected, efficient discharge pipe RV1 is connected with the front end of first order current-limiting resistance R1, varistor RV2 is connected with the rear end of first order current-limiting resistance R1, in the second level, the rear end of current-limiting resistance R2 is connected with two-way Transient Suppression Diode TV3.The overvoltage protection device is classified pressure limiting by the voltage-limiting element of three kinds of difference in functionality principles, and two-stage resistance current limliting, two hard touchdowms, ensure high pressure sensor under abnormal pressure, injury of the limitation output voltage for powered display device.
Description
Technical field
A kind of electric protective equipment is the utility model is related to, it is powered aobvious to prevent that high pressure from sealing in more particularly to one kind
Show the overvoltage protection device of device.
Background technology
Small ground connection distrbution network is usually 6kv, 10kv and 35kv level Grid system at present, and single-phase earthing non-faulting is mutually electric
1.732 times of pressure rise normal value, can occur three-phase shortcircuit or line to line fault, high voltage sneaking into secondary circuit, closing height for a long time
High pressure sensor is smashed in transcient short circuit time high pressure, high pressure scurries into electrification display, causes powered because environment is closed in Ya Gui cable vaults
Display device is burnt, and influences related electric operation circuit (switch divide-shut brake circuit), temperature and humidity test circuit, ventilation and heating
Circuit, because high pressure is scurried into, can cause above associated loop equipment can not bear high pressure and burn.According to accident case in recent years
With a large amount of related datas, find to be installed on high-voltage board state display device or high-voltage board state of a control display dress in electrification display
Contain switching on and shutting down cabinet position contact in putting, in high-voltage board state display device, heater, cabinet inner blower, Temperature Humidity Sensor, very
To containing switch tripping coil circuit, these circuits are all critically important, if high pressure is scurried into, secondary device are run and forms prestige
The side of body, causes false protection or device to burn, or even can have personal life to threaten the personnel to work.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model, which provides one kind, prevents high pressure from sealing in powered display
The overvoltage protection device of device.
The utility model is achieved through the following technical solutions：A kind of overvoltage for preventing high pressure from sealing in electrification display
Protector, including high pressure sensor and electrification display, overvoltage is provided between the high pressure sensor and electrification display
Protector, the overvoltage protection device divide three-phase input and three-phase to export using deposited copper circuit board, each phase electricity in three-phase circuit
Road concatenates two level current limiting resistance R1 and R2, R1 and R2 is serially connected, and is connected with efficiently in the front end of first order current-limiting resistance R1
Discharge tube RV1, is connected with varistor RV2, in the rear end of second level current-limiting resistance R2 in the rear end of first order current-limiting resistance R1
It is connected with two-way Transient Suppression Diode TV3.
In such scheme, the current-limiting resistance R1 and R2 select 5W D4 3RO J cement resistors.
In such scheme, the efficient discharge pipe RV1 selects 2R300M/L efficient discharge pipes.
In such scheme, the varistor RV2 selects 2D391K varistors.
In such scheme, the two-way Transient Suppression Diode TV3 selects the two-way Transient Suppression Diodes of 30KPA288CA.
In such scheme, the overvoltage protection device distance high-voltage sensor 50cm.
In such scheme, end of incoming cables N-in and leading-out terminal N-out on the overvoltage protection device are set at two not respectively
With the earth point in place, earth point is arranged in high-voltage board cable vault at N-in, distance high-voltage sensor ground point at a distance of 80~
Earth point is arranged in high-voltage board breaker chamber lower cabinet body at 100cm, N-out, at distance N-in earth point at a distance of 80~
100cm。
Compared with prior art, it has a kind of overvoltage protection device for preventing high pressure from sealing in electrification display of the utility model
Beneficial effect is：
The overvoltage protection device is classified pressure limiting by the voltage-limiting element of three kinds of difference in functionality principles, two-stage resistance current limliting, and two
Hard touchdowm, ensures high pressure sensor under abnormal pressure, injury of the limitation output voltage for powered display device.
Brief description of the drawings
Fig. 1 is a kind of operating principle analysis of overvoltage protection device for preventing high pressure from sealing in electrification display of the utility model
Figure.
Fig. 2 is the circuit diagram of overvoltage protection device.
In figure：1. high-pressure side, 2. high pressure sensors, 3. overvoltage protection devices, 4. electrification displays, 5. high pressure sensors
Earth point, 6.N-in earth points, 7.N-out earth points.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment is a kind of to the utility model prevents high pressure from sealing in the excessively electric of electrification display
Pressure protector is further described：
Fig. 1 is a kind of operating principle analysis of overvoltage protection device for preventing high pressure from sealing in electrification display of the utility model
Figure, Fig. 2 is the circuit diagram of overvoltage protection device.In figure, this overvoltage protection for preventing high pressure from sealing in electrification display
Device includes high pressure sensor 2 and electrification display 4, and overvoltage guarantor is provided between the high pressure sensor 2 and electrification display 4
Device 3 is protected, the overvoltage protection device 3 divides three-phase input and three-phase to export using copper circuit board is applied, each phase electricity in three-phase circuit
Road concatenates two-stage 5W D4 3RO J current-limiting resistances R1 and R2, R1 and R2 is serially connected, in the front end of first order current-limiting resistance R1
2R300M/L efficient discharge pipe RV1 are connected with, 2D391K varistor RV2 are connected with the rear end of first order current-limiting resistance R1,
In the second level, the rear end of current-limiting resistance R2 is connected with the two-way Transient Suppression Diode TV3 of 30KPA288CA.
For RV1 using 2R300M/L efficient discharges pipe as first class of protection element, its breakdown voltage is 250V-345V；RV2
For 2D391K varistors, as overvoltage protector device second class protection element, it is 351V-429V that it, which protects electricity,；TV3 is two-way
Transient Suppression Diode 30KPA288CA, its operating voltage are less than or equal to 288V；Breakdown voltage 321V, clamp voltage 470V.
Three-level protective element as overvoltage protection device；
When there is surge over voltage signal in high pressure sensor secondary terminals：
I. if this voltage magnitude releases value more than level element and is less than two three-levels, opened first by RV1 efficient discharges pipe
It is dynamic, between over-pressed signal is clamped 250-345V, shunting is carried out to most of surge current and is released, absorb surge interfering energy,
Play the protective effect to electrification display and related secondary device.Remaining residual voltage transfers to rear two class protection to complete.
II. if Overvoltage Amplitude is more than level element and starts voltage more than rear two-stage element protection, due to rear two-stage
The element startup time is fast, and rear two-stage is released prior to starting, and increases at this time with R2 electric currents, and the lifting of RV2 ends voltage-to-ground, reaches
During 351V, the protection of RV2 varistors starts, and by voltage clamp between 351V-429V, plays to TV3 pipes and related secondary sets
Standby protective effect.Overvoltage signal is also continuing at this time, and R1 front voltages will continue to lift up, and reach RV1 discharge tube build-ups of luminance and put
The electric time, the electric discharge of RV1 build-ups of luminance, makes damage current bypass to greatly.The secondary output voltage of sensor is finally clamped in 250-
345V or so, so as to play the protection to overvoltage protector and secondary connection insulation.
III. infield and installation requirement：Overvoltage protection device is generally arranged in high-voltage board cable vault, distance high-voltage
Sensor 50cm is advisable, and the N-in and N-out on voltage protector set the earth point of different location at two respectively, are connect at N-in
Place is arranged in high-voltage board cable vault, and distance high-voltage sensor ground point is advisable at a distance of 80~100cm；Earth point at N-out
It is arranged in high-voltage board breaker chamber lower cabinet body, earth point is at a distance of 80~100cm at distance high-voltage sensor ground point and N-in
It is advisable；It is connected on substation's main grounding grid, using the hard annealed copper wire of multiply, line footpath is not less than 4mm2.
The overvoltage protection device is classified pressure limiting by the voltage-limiting element of three kinds of difference in functionality principles, two-stage resistance current limliting, and two
Hard touchdowm, ensures high pressure sensor under abnormal pressure, injury of the limitation output voltage for powered display device.
The above descriptions are merely preferred embodiments of the present invention, and not the utility model is made in any form
Limitation, although the utility model has been disclosed with preferred embodiment as above, but be not limited to the utility model, it is any ripe
Know professional and technical personnel, do not departing from the range of technical solutions of the utility model, when the method using the disclosure above and
Technology contents make a little change or are modified to the equivalent embodiment of equivalent variations, as long as being without departing from the utility model technology
The content of scheme, any simple modification made according to the technical essence of the utility model to above example, equivalent variations with
Modification, in the range of still falling within technical solutions of the utility model.
Claims (7)
1. a kind of overvoltage protection device for preventing high pressure from sealing in electrification display, including high pressure sensor and electrification display, its
It is characterized in that：Overvoltage protection device is provided between the high pressure sensor and electrification display, the overvoltage protection device makes
Divide three-phase input and three-phase to export with deposited copper circuit board, concatenated per one-phase circuit in three-phase circuit two level current limiting resistance R1 and
R2, R1 and R2 are serially connected, and efficient discharge pipe RV1 is connected with the front end of first order current-limiting resistance R1, in first order current limliting electricity
The rear end of resistance R1 is connected with varistor RV2, and in the second level, the rear end of current-limiting resistance R2 is connected with two-way Transient Suppression Diode
TV3。
A kind of 2. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
The current-limiting resistance R1 and R2 select 5W D43RO J cement resistors.
A kind of 3. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
The efficient discharge pipe RV1 selects 2R300M/L efficient discharge pipes.
A kind of 4. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
The varistor RV2 selects 2D391K varistors.
A kind of 5. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
The two-way Transient Suppression Diode TV3 selects the two-way Transient Suppression Diodes of 30KPA288CA.
A kind of 6. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
The overvoltage protection device distance high-voltage sensor 50cm.
A kind of 7. overvoltage protection device for preventing high pressure from sealing in electrification display according to claim 1, it is characterised in that：
End of incoming cables N-in and leading-out terminal N-out on the overvoltage protection device set the earth point of different location at two, N-in respectively
Place's earth point is arranged in high-voltage board cable vault, distance high-voltage sensor ground point earth point at 80~100cm, N-out
It is arranged in high-voltage board breaker chamber lower cabinet body, earth point is at a distance of 80~100cm at distance N-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721370991.8U CN207339261U (en) | 2017-10-19 | 2017-10-19 | A kind of overvoltage protection device for preventing high pressure from sealing in electrification display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721370991.8U CN207339261U (en) | 2017-10-19 | 2017-10-19 | A kind of overvoltage protection device for preventing high pressure from sealing in electrification display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207339261U true CN207339261U (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721370991.8U Active CN207339261U (en) | 2017-10-19 | 2017-10-19 | A kind of overvoltage protection device for preventing high pressure from sealing in electrification display |
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| CN (1) | CN207339261U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137285A (en) * | 2021-11-24 | 2022-03-04 | 广东电网有限责任公司 | Charged display |
-
2017
- 2017-10-19 CN CN201721370991.8U patent/CN207339261U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137285A (en) * | 2021-11-24 | 2022-03-04 | 广东电网有限责任公司 | Charged display |
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