CN206479599U - A kind of on off test device of TN system earths line - Google Patents
A kind of on off test device of TN system earths line Download PDFInfo
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- CN206479599U CN206479599U CN201720143714.7U CN201720143714U CN206479599U CN 206479599 U CN206479599 U CN 206479599U CN 201720143714 U CN201720143714 U CN 201720143714U CN 206479599 U CN206479599 U CN 206479599U
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Abstract
The utility model discloses a kind of on off test device of TN system earths line, include electrical equipment and supply transformer, the connection of LN lines is provided between the electrical equipment and supply transformer, resistance R1 is equipped with the LN lines, resistance R2, resistance R3 and resistance R4, the LN lines include L lines and N lines, the L lines, resistance R1, resistance R2, resistance R3 and N line is in turn connected to form physical circuit loop, the supply transformer and electrical equipment are all provided with and are connected to intratelluric ground wire, ground wire connecting line is provided between the resistance R4 and the ground wire of electrical equipment, the L lines, resistance R1, resistance R4, ground wire connecting line, electrical equipment end ground wire, the earth and supply transformer end ground wire are in turn connected to form ground return circuit；The on off test device of the TN system earth lines provides the solution of simplicity for the intelligent monitoring of the protection ground wire break-make of equipment on remote independent bar.
Description
Technical field
The utility model is related to a kind of on off test device of TN system earths line.
Background technology
In lightning protection protection works neutralizing device earth work, particularly in outdoor equipment electric power thus supplied, such as
Outdoor monitoring, outdoor relaying station, communication station etc., power circuit do not lay ground wire, and scene ground connection have to be connected to grounded screen
Independent grounding point, due to not clear and definite physical electrical loop, ground wire break-make measurement difficulty is big.As shown in figure 1, independently setting
Put in outdoor vertical rod, when on bar equipment power only LN lines when, equipment and protection ground connection rely only on the ground connection of grounded screen
PE lines, its break-make directly determines that equipment lightning protection effect quality and equipment run safety, so be necessary to monitor its break-make
State.
Utility model content
In view of this, the utility model purpose is to provide a kind of independent grounding net ground wire break-make that is applied to and alerted, especially
It is to provide the TN systems of easy solution for the intelligent monitoring of the protection ground wire break-make of equipment on remote independent bar
The on off test device of ground wire.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is：
A kind of on off test device of TN system earths line, includes electrical equipment and supply transformer, and the electricity consumption is set
It is connected for LN lines are provided between supply transformer, resistance R1, resistance R2, resistance R3 and resistance is equipped with the LN lines
R4, the LN lines include L lines and N lines, and the L lines, resistance R1, resistance R2, resistance R3 and N line are in turn connected to form physical circuit
Loop, the electrical equipment and supply transformer are all provided with the ground for being connected to intratelluric ground wire, the resistance R4 and electrical equipment
Ground wire connecting line, the L lines, resistance R1, resistance R4, ground wire connecting line, electrical equipment end ground wire, the earth and confession are provided between line
Piezoelectric transformer end ground wire is in turn connected to form ground return circuit.
A kind of method of testing of the on off test device of TN system earths line, by the connecting line between resistance R1 and resistance R2
It is set to A lines, the connecting line between resistance R2 and resistance R3 is set to B lines, ground wire connecting line is set to C lines, by measures AB two
The difference of terminal voltage, judges the break-make of C sections of ground wire connecting line.
Further, under conditions of supply voltage is 220V,
1) when AB disconnects, 220V is divided on R1, R2, R3, U (R2) ＜ 220V, output end output high level；
2) when AB is connected, 220V is flowed back through R1, R2, R3, R4, R5 partial pressure by ground return circuit, and U (R3) is exported close to 0V
End output low level.
Principle explanation：According to national standard to the requirement of electricity consumption standard, civilian and general industry electricity consumption uses TN systems, i.e., in power supply
Transformer terminal neutral earthing.In the application of upper figure, supply line only has LN lines, and ground connection PE lines can be regarded as connecting by the earth
It is connected to the earth point of supply transformer.
The utility model has the technical effect that following aspect：Due to R2 two ends potential difference with C lines break-make shape
State changes and different, constitutes the test physical circuit of ground wire break-make, measures the difference of AB both end voltages, judges that ground wire is connected
The break-make that C sections of line；Its advantage is that judging circuit is simple and reliable, is easily realized.
Brief description of the drawings
Fig. 1 is the applicable cases of existing independent grounding；
Fig. 2 is the ground wire break-make detection principle diagram of the on off test device of TN system earths line of the present utility model；
Fig. 3 is the implementing circuit figure of the on off test device of TN system earths line of the present utility model；
Fig. 4 is the circuit diagram applied to ground wire break-make sensor and live alarm device.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail, so that the utility model skill
Art scheme is more readily understood and grasped.
Embodiment 1
As shown in fig.2, a kind of on off test device of TN system earths line, includes electrical equipment 1 and power supply transformation
Device 2, is provided with the connection of LN lines, the LN lines between the electrical equipment 1 and supply transformer 2 and is equipped with resistance R1, electricity
Hinder R2, resistance R3 and resistance R4, the LN lines include L lines and N lines, the L lines, resistance R1, resistance R2, resistance R3 and N line according to
Secondary connection forms physics line loop, and the supply transformer 2 is provided with the ground wire being connected in the earth 3, the resistance R4 and electricity consumption
Ground wire connecting line C, the L lines, resistance R1, resistance R4, ground wire connecting line C, the end of electrical equipment 1 are provided between the ground wire of equipment 1
Ground wire, the earth 3, the end ground wire of supply transformer 2 and N lines are in turn connected to form ground return circuit.
Embodiment 2
As shown in fig.3, component R1=R3=6M Ω；R2=2M Ω；R4=R5=100K Ω；D3=rectifier bridges；C1
=1uF/50V；DZ=5V voltage stabilizings；Q1=A8050；D1=D2=IN4007.
Work as L-N=220V,
1) when AB disconnects, 220V is divided on R1, R2, R3, U (R2)=31.4V；OUT exports high level；
2) when AB is connected, 220V is flowed back through R1, R2, R3, R4, R5 partial pressure by ground return circuit, and U (R3) is close to 0V；OUT
Export low level.
The advantage of this circuit is that circuit is simple, R1, and the leakage current that R3 determines circuit is UA grades, and D3 rectifications obtain R2 two
Terminal voltage reflects the break-make of C-terminal circuit in Fig. 2, for driving late-class circuit after Q1 follows circuit power to amplify.
Embodiment 3
As shown in fig.4, a kind of ground wire break-make sensor and live alarm device, R1=R3=6M Ω；R2=2M Ω；R4
=R5=100K Ω；R6=10 Ω；R7=10 Ω；R8=4.7K Ω；D1=D2=D3=IN4007；DZ1=5V voltage stabilizings；C1=
1UF/50V；BG1=bridge heaps；LED=light emitting diodes, IC1=VCC=9V；VEE=0V, SPEAKER=9V loudspeaker, realize work(
Energy：When ground wire disconnects, LED is bright, alarm sound.
The utility model has the technical effect that following aspect：Due to R2 two ends potential difference with C lines break-make shape
State changes and different, constitutes the test physical circuit of ground wire break-make, measures the difference of AB both end voltages, judges that ground wire is connected
The break-make that C sections of line；Its advantage is that judging circuit is simple and reliable, is easily realized.
Certainly, it is representative instance of the present utility model above, in addition, the utility model can also have other a variety of
The technical scheme of embodiment, all use equivalent substitutions or equivalent transformation formation, all falls within the utility model and is claimed
Within the scope of.
Claims (2)
1. a kind of on off test device of TN system earths line, it is characterised in that：Include electrical equipment and supply transformer, institute
State to be provided between electrical equipment and supply transformer on the connection of LN lines, the LN lines and be equipped with resistance R1, resistance R2, resistance
R3 and resistance R4, the LN lines include L lines and N lines, and the L lines, resistance R1, resistance R2, resistance R3 and N line are in turn connected to form
Physical circuit loop, the electrical equipment and supply transformer are all provided with and are connected to intratelluric ground wire, the resistance R4 and electricity consumption
Between the ground wire of equipment be provided with ground wire connecting line, the L lines, resistance R1, resistance R4, ground wire connecting line, electrical equipment end ground wire,
Greatly, supply transformer end ground wire and N lines are in turn connected to form ground return circuit.
2. the on off test device of TN system earths line according to claim 1, it is characterised in that：The supply transformer
Supply voltage be 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720143714.7U CN206479599U (en) | 2017-02-17 | 2017-02-17 | A kind of on off test device of TN system earths line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720143714.7U CN206479599U (en) | 2017-02-17 | 2017-02-17 | A kind of on off test device of TN system earths line |
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| Publication Number | Publication Date |
|---|---|
| CN206479599U true CN206479599U (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720143714.7U Active CN206479599U (en) | 2017-02-17 | 2017-02-17 | A kind of on off test device of TN system earths line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771825A (en) * | 2017-02-17 | 2017-05-31 | 广东立信防雷科技有限公司 | The on off test device and its method of testing of a kind of TN system earths line |
-
2017
- 2017-02-17 CN CN201720143714.7U patent/CN206479599U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771825A (en) * | 2017-02-17 | 2017-05-31 | 广东立信防雷科技有限公司 | The on off test device and its method of testing of a kind of TN system earths line |
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