CN101074974A - Grounded inspection circuit - Google Patents
Grounded inspection circuit Download PDFInfo
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- CN101074974A CN101074974A CN 200710128085 CN200710128085A CN101074974A CN 101074974 A CN101074974 A CN 101074974A CN 200710128085 CN200710128085 CN 200710128085 CN 200710128085 A CN200710128085 A CN 200710128085A CN 101074974 A CN101074974 A CN 101074974A
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- resistance
- neon bulb
- inspection circuit
- ground connection
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Abstract
A detection circuit of grounding is prepared as connecting one end of the first resistance to live line and another end to the first Ne lamp-bulb, connecting one end of the second resistance to zero line and another end to the second Ne lamp-bulb, connecting another ends of the first and the second Ne lamp-bulbs commonly to the third resistance, connecting another end of the third resistance to grounding line, confirming that grounding line is not grounded if both the first and the second Ne lamp-bulbs are lightened and confirming that grounding line is properly grounded if the first Ne lamp-bulb is lightened but the second one not.
Description
Technical field
The present invention relates to the ground technology, especially relate to a kind of grounded inspection circuit.
Background technology
Many electrical outdoor subsets damage because of thunderbolt easily, and especially the outdoor type electronic communication product is easy to cause because of thunderbolt the damage of device port and power supply, becomes the problem that is difficult to avoid that each manufacturer faces.
The way that solves at present outdoor type electronic communication product lightning protection problem has two kinds, at first is that all relate to outdoor connectivity port and must add qualified lightning-protection module; Secondly, lightning-protection module must have good lightning protection.Neither of the two can be dispensed.
Please referring to Fig. 1, this figure is used for illustrating the connecting circuit at a kind of fiber optic signal port, the effect of grounding circuit.In this circuit, lightning protection device 11 1 ends connect the outdoor communication cable, and the other end connects fiber optic signal port 12, also has the earth terminal by ground connection.Wherein, the outdoor communication cable may be introduced lightning current.If this lightning protection device 11 not, outdoor cable directly connects fiber optic signal port 12, and then thunder and lightning will directly be introduced fiber optic, and fiber optic will very easily be broken.After using this lightning protection device 11, if ground connection is good, the lightning current overwhelming majority flows to the earth by the ground wire of lightning protection device 11, and fiber optic signal port 12 can not receive very big lightning current, has avoided owing to thunderbolt damages.On the contrary, if ground wire does not have ground connection or ground connection not firm, then lightning current can not flow to the earth by ground wire swimmingly, will flow to fiber optic signal port 12, might damage fiber optic signal port 12.
For above-mentioned reasons, ground connection well is the important requirement that strengthens electrical equipment, electronic equipments safety, must obtain to guarantee.
In the real work, ground connection work is but out in the cold easily, reason is, ground connection is a kind of safety practice, and when special circumstances not occurring, grounding circuit is also inoperative, therefore many producers are negligent of detecting the ground connection situation, even in the process of checking and accepting was installed, also just whether acceptance checkout equipment ran well, and does not does not check and accept the ground connection situation.In addition, in routine duties, grounding circuit is destroyed for various reasons probably, causes imperfect earth, but because equipment often can also operate as normal, causes grounding circuit to go wrong and but be not easy to be found.
Except above-mentioned reason, the difficulty that stake resistance detects is higher also to be that people are negligent of reason that grounding circuit is detected.Stake resistance generally comprises the contact resistance between ground lead resistance, grounding body resistance, grounding body and soil, and the spreading resistance in the soil etc., these resistances are added up and are generally required to be no more than several ohm.During ground connection, adopt various measures to reduce these resistance.Because resistance is very low, detection has brought difficulty to stake resistance, and carrying out accurately, stake resistance detects and need just can carry out by special apparatus and equipment.
Please referring to Fig. 2, this illustrates a kind of grounded inspection circuit commonly used in the prior art.Earthing test instrument 21 has three detection lines, and wherein detection line A is a concentric line, is used for connection device ground stud III; Detection line B is the current detecting line, by the first auxiliary earth stake I ground connection; Detection line C is the voltage detecting line, and by the second auxiliary earth stake II ground connection, the earthing position on the described power supply of the earthing position of described first ground stud I distance ground is near than the second ground stud II.Earthing test instrument 21 detects the current value between the first auxiliary earth stake I and the ground stud III, and detects the magnitude of voltage between the second auxiliary earth stake II and the ground stud III, then with magnitude of voltage divided by current value, finally obtain grounding resistance.
The stake resistance detection method that above-mentioned prior art provides can obtain measurement result more accurately, but measuring process is too complicated.When utilizing said method to measure, need set up special-purpose auxiliary earth stake, its ground connection quality requirements is very high, otherwise can cause the result inaccurate.Above-mentioned factor causes grounding resistance measurement process complexity, so that some occasions that need detect stake resistance are not simply carried out any measurement.
Please referring to Fig. 2, this illustrates a kind of grounded inspection circuit commonly used in the prior art.Earthing test instrument 21 has three detection lines, and wherein detection line A is a concentric line, is used for connection device ground stud III; Detection line B is the current detecting line, by the first auxiliary earth stake I ground connection; Detection line C is the voltage detecting line, and by the second auxiliary earth stake II ground connection, the earthing position on the described power supply of the earthing position of described first ground stud I distance ground is near than the second ground stud II.Earthing test instrument 21 detects the current value between the first auxiliary earth stake I and the ground stud III, and detects the magnitude of voltage between the second auxiliary earth stake II and the ground stud III, then with magnitude of voltage divided by current value, finally obtain grounding resistance.
The stake resistance detection method that above-mentioned prior art provides can obtain measurement result more accurately, but measuring process is too complicated.When utilizing said method to measure, need set up special-purpose auxiliary earth stake, its ground connection quality requirements is very high, otherwise can cause the result inaccurate.Above-mentioned factor causes grounding resistance measurement process complexity, so that some occasions that need detect stake resistance are not simply carried out any measurement.
The same with the lightning protection engineering, standard lightning protection test also must be by there being qualification professional contingent to finish, and need the considerable expense of cost.Consequently many engineering merchants abandon test.
In addition, many engineering projects of being finished by professional contingent also have only the test data when checking and accepting.In the routine work afterwards, lightning protection might cause performance decline or inoperative because of a variety of causes, but because equipment work is normal, causes lightning protection to go wrong and but can't find.
Summary of the invention
At above-mentioned defective, the technical matters that the present invention solves is, a kind of grounded inspection circuit is provided, and this grounded inspection circuit can carry out ground connection detection easily, obtains the roughly judgement of ground connection situation.
Grounded inspection circuit provided by the invention comprises that an end connects first resistance of live wire, and its other end connects first neon bulb; One end connects second resistance of zero line side, and its other end connects second neon bulb; The other end of described first neon bulb and second neon bulb is connected an end of the 3rd resistance jointly, and the other end of the 3rd resistance connects the ground wire of ground connection situation to be detected; Described first neon bulb and second neon bulb are the test pencil neon bulb, and have identical running parameter; Described first resistance is the identical resistance of resistance with second resistance; When first neon bulb and second neon bulb are all shinny, show that ground wire is unearthed; Shinny when first neon bulb, when second neon bulb is not shinny, show the normal ground connection of ground wire.
Preferably, the resistance of described the 3rd resistance is identical with described first resistance or be lower than this first resistance.
Preferably, described first neon bulb specifically is to be connected described the 3rd resistance by linked switch with second neon bulb; This linked switch has two groups of switch contacts that link mutually, and described first neon bulb is connected with described the 3rd resistance by these two groups of switch contacts respectively with second neon bulb.
Preferably, described linked switch is the uni-directional push-button switch of no bayonet socket, when its button is pressed, and two groups of switch contact conductings respectively; When unclamping, two groups of switch contacts disconnect respectively.
Preferably, the resistance of described first resistance, second resistance is 2M Ω; The resistance of described the 3rd resistance is not less than 2M Ω.
Preferably, described first neon bulb and second neon bulb are the red neon bulb that starting voltage is 85V.
Compared with prior art, the process that circuit provided by the invention carries out the ground connection detection is very simple, only needs shirtsleeve operation to realize.And the judgement of this device ground connection for whether is very directly perceived.Although the measurement result precision of this device is lower, can not be used for whether ground connection is reached standard and make accurate judgement, but this device can be used for some simple ground connection performances and judge occasions, and can measure does not have situations such as ground connection or stake resistance be obviously excessive at all.
In the preferred embodiments of the present invention, connect no bayonet socket uni-directional push-button switch in circuit, only need press this switch, just can carry out measuring with this, unclamp this switch, then the disconnection that is connected of this testing circuit and other circuit is unlikely the operate as normal that influences circuit.Like this, this circuit can be installed in some ground connection is detected in the equipment have relatively high expectations, carry out ground connection easily-testing easily at any time, so just can avoid occurring the serious improper and unperceived situation of ground connection and occur.
Description of drawings
Fig. 1 is the grounding circuit effect synoptic diagram in a kind of connecting circuit of fiber optic signal port;
Fig. 2 is a kind of grounded inspection circuit of the prior art;
Fig. 3 is the grounded inspection circuit that first embodiment of the invention provides;
Fig. 4 is the grounded inspection circuit that second embodiment of the invention provides.
Embodiment
Please referring to Fig. 3, this figure is the circuit diagram of the grounded inspection circuit that provides of first embodiment of the invention.
As shown in Figure 3, the device that provides of this embodiment is used to detect the ground connection situation of 220V electric main.In the circuit of this device, live wire, the other end that resistance R 1 one ends connect the 220V civil power then connect neon bulb DS1; Resistance R 2 one ends connect the zero line of 220V civil power, and the other end connects neon bulb DS2; The other end that neon bulb DS1 and neon bulb DS2 are not connected with resistance DS2 with resistance DS1 then connects an end of resistance R 3 jointly, and the other end of resistance R 3 then connects ground wire.In this circuit, resistance R 1, resistance R 2 and neon bulb DS1, neon bulb DS2 are respectively the identical electrical equipment of parameter.Resistance R 1, resistance R 2 are current-limiting resistance, its objective is that to avoid resistor current excessive, cause danger, and its typical resistance is 2M Ω, and resistance R 3 plays the effect that improves measuring accuracy in circuit, and also adopting resistance is the straight cutting resistance of 2M Ω; Certainly, it is identical that the resistance of this resistance R 3 and resistance R 1 and resistance R 2 may not need, and still, the resistance of this resistance R 3 should not be higher than resistance R 1 at least, otherwise this device can't operate as normal.Neon bulb is a red neon bulb commonly used in the test pencil, and its starting voltage representative value is 85V.
When the ground wire that is connected with resistance R 3 is unearthed, then be equivalent to disconnect by the circuit of resistance R 3 to ground wire.At this moment, foregoing circuit forms the closed-loop path from the 220V live wire to zero line, on this closed-loop path, the 220V line voltage is got back to zero line through resistance R 1, neon bulb DS1, neon bulb DS2, resistance R 2, because this circuit is a symmetrical circuit, neon bulb DS1, neon bulb DS2 both end voltage all can equate and reach starting voltage, and two neon bulbs all can be luminous.When resistance R 3 ground connection were good, then above-mentioned symmetry status was broken, and the 220V live wire connects power supply ground by resistance R 1, neon bulb DS1 by ground wire, makes neon bulb DS1 luminous.Relative therewith, neon bulb DS2 both end voltage difference then can reduce.The voltage of supposing neon bulb DS1 two ends is its starting voltage 85V, then 220V voltage is by R1, two 2M Ω of R3 electric resistance partial pressure, and the voltage drop of 85V is arranged on neon bulb DS1, then resistance R 3 is (220-85)/2=72.5 (V) with the voltage of the common ends of neon bulb DS1 and neon bulb DS2; This voltage does not reach the starting voltage of neon bulb DS2, and therefore, neon bulb DS2 can be not luminous, at this moment, can judge the ground connection that ground wire is firm.When the middle situation of above-mentioned two states, if neon bulb DS2 is luminous, when brightness is dark than neon bulb DS1, though may be ground wire ground connection, imperfect earth.
In the foregoing description, in a single day this circuit connects, just in running order all the time, obviously there is no need.For this reason, second embodiment below provides a kind of more perfect circuit.Please referring to Fig. 4.Because this circuit obtains on the first embodiment basis, therefore, with the identical label of device employing identical among first embodiment.
In the circuit shown in Figure 4, neon bulb DS1, neon bulb DS2 connect resistance R 3 respectively by two pairs of contacts of coupled switch S1.The tie point 1 of described linked switch S1 and tie point 4 are the pair of switches contact, and tie point 2 and tie point 3 are the pair of switches contact.When the button of linked switch S1 was depressed, two pairs of switch contacts were connected respectively, made this circuit and the first embodiment circuit identical, and like this, that just can observe neon bulb DS1, neon bulb DS2 luminously judges ground wire whether ground connection is good.In normal circumstances, because linked switch S1 is in off state, therefore, this circuit is not worked; Neon bulb DS1, neon bulb DS2 two ends do not have voltage, can not damage owing to powering up for a long time, and can not influence the work of other circuit yet.Consider the job requirement of this circuit, described linked switch S1 preferably adopts the uni-directional push-button switch of no bayonet socket, this switch when button is depressed, switch contacts, the luminance that can observe neon bulb this moment obtains to judge about the situation of ground connection; This grounded inspection circuit is cut off in then switch contact disconnection when unclamping.
The ground detection device that above embodiment provides, though the precision that ground connection is detected is not high, but, can screen easily and ground wire whether occurs and do not have situations such as ground connection or ground connection are serious bad fully, therefore be applicable to many occasions that need to understand the basic condition of ground connection.In addition, this device is particularly suited for being installed in some, and whether ground connection can produce in the electric equipment of obvious influence, as standing grounded inspection circuit, when especially adopting the circuit of second embodiment, can be when needs be understood the ground connection situation of equipment, press linked switch S1, can know the equipment ground situation.
The foregoing description can be used to detect the ground connection situation of various earthing device, as long as the end that resistance R among the embodiment 3 is connected with ground wire is connected to corresponding ground wire, can detect the ground connection situation of this ground wire.Equally, although the foregoing description is an example with the civil power of hot voltage 220V, the principle of work of this circuit also can be used for the situation of other ac voltage undoubtedly.Certainly, according to different magnitudes of voltage, should select the circuit component of different parameters.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1, a kind of grounded inspection circuit is characterized in that, comprises, an end connects first resistance of live wire, and its other end connects first neon bulb; One end connects second resistance of zero line side, and its other end connects second neon bulb; The other end of described first neon bulb and second neon bulb is connected an end of the 3rd resistance jointly, and the other end of the 3rd resistance connects the ground wire of ground connection situation to be detected; Described first neon bulb and second neon bulb are the test pencil neon bulb, and have identical running parameter; Described first resistance is the identical resistance of resistance with second resistance; When first neon bulb and second neon bulb are all shinny, show that ground wire is unearthed; Shinny when first neon bulb, when second neon bulb is not shinny, show the normal ground connection of ground wire.
2, grounded inspection circuit according to claim 1 is characterized in that, the resistance of described the 3rd resistance is identical with described first resistance or be lower than this first resistance.
3, grounded inspection circuit according to claim 1 is characterized in that, described first neon bulb specifically is to be connected described the 3rd resistance by linked switch with second neon bulb; This linked switch has two groups of switch contacts that link mutually, and described first neon bulb is connected with described the 3rd resistance by these two groups of switch contacts respectively with second neon bulb.
According to the described grounded inspection circuit of claim 3, it is characterized in that 4, described linked switch is the uni-directional push-button switch of no bayonet socket, when its button is pressed, two groups of switch contact conductings respectively; When unclamping, two groups of switch contacts disconnect respectively.
5, grounded inspection circuit according to claim 1 is characterized in that, the resistance of described first resistance, second resistance is 2M Ω; The resistance of described the 3rd resistance is not less than 2M Ω.
6, grounded inspection circuit according to claim 1 is characterized in that, described first neon bulb and second neon bulb are the red neon bulb that starting voltage is 85V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101280851A CN101074974B (en) | 2007-07-09 | 2007-07-09 | Grounded inspection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101280851A CN101074974B (en) | 2007-07-09 | 2007-07-09 | Grounded inspection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101074974A true CN101074974A (en) | 2007-11-21 |
| CN101074974B CN101074974B (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101280851A Expired - Fee Related CN101074974B (en) | 2007-07-09 | 2007-07-09 | Grounded inspection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472352A (en) * | 2013-09-16 | 2013-12-25 | 国网河南省电力公司焦作供电公司 | Ground lead detection method |
| CN106066443A (en) * | 2016-06-07 | 2016-11-02 | 浙江医药高等专科学校 | The sample circuit of a kind of safety ground detector and safety ground detector |
| CN108469550A (en) * | 2017-02-23 | 2018-08-31 | 西门子公司 | Device and method for the ground lead resistance for determining charging unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2116224U (en) * | 1992-04-02 | 1992-09-16 | 北京市劳动保护科学研究所 | Isolation monitoring and alarming apparatus |
-
2007
- 2007-07-09 CN CN2007101280851A patent/CN101074974B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472352A (en) * | 2013-09-16 | 2013-12-25 | 国网河南省电力公司焦作供电公司 | Ground lead detection method |
| CN103472352B (en) * | 2013-09-16 | 2016-11-23 | 国家电网公司 | A kind of ground wire testing method |
| CN106066443A (en) * | 2016-06-07 | 2016-11-02 | 浙江医药高等专科学校 | The sample circuit of a kind of safety ground detector and safety ground detector |
| CN106066443B (en) * | 2016-06-07 | 2018-07-10 | 浙江医药高等专科学校 | A kind of sample circuit of safety ground detector and safety ground detector |
| CN108469550A (en) * | 2017-02-23 | 2018-08-31 | 西门子公司 | Device and method for the ground lead resistance for determining charging unit |
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| Publication number | Publication date |
|---|---|
| CN101074974B (en) | 2011-02-09 |
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Owner name: NANJING COECOM OPTOELECTRONIC EQUIPMENTS CO., LTD. Free format text: FORMER OWNER: YU NINGSHENG Effective date: 20120905 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20120905 Address after: 210008 -3, Daming Road, Qinhuai District, Jiangsu, Nanjing, 135 Patentee after: Nanjing Coecom Optoelectronic Equipments Co., Ltd. Address before: 603, room 7, West Hall, Xuanwu District, Jiangsu, Nanjing, 210008 Patentee before: Yu Ningsheng |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20160709 |