CN204044251U - A kind of earth resistance device - Google Patents
A kind of earth resistance device Download PDFInfo
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- CN204044251U CN204044251U CN201420429269.7U CN201420429269U CN204044251U CN 204044251 U CN204044251 U CN 204044251U CN 201420429269 U CN201420429269 U CN 201420429269U CN 204044251 U CN204044251 U CN 204044251U
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- earth resistance
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- 238000012360 testing method Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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Abstract
The utility model provides a kind of earth resistance device, this earth resistance device comprises: clamp and detection case, wherein, described clamp comprise: clamp rear end and the clamp front end be made up of two panels jaw, jaw described in two panels connects one end of described clamp rear end by rotating shaft, and the other end of described clamp rear end is fixedly connected with described detection case; When jaw closes described in two panels, form one for entangling the jaw of ground wire, and the circuit of jaw inside described in two panels forms a closed path mutual inductor coil; The multiple shunt resistances, range selector, galvanometer, the rectification amplifier that connect successively is provided with in described detection case; Shunt resistance described in described closed path mutual inductor coil connects.By earth resistance device of the present utility model, realize the change of Real-Time Monitoring grounded screen electric resistance value, avoid because the change of grounding resistance brings hidden danger to the normal operation of equipment, facility and personal safety.
Description
Technical field
The utility model is about power station maintenance measuring technology, particularly, is about a kind of earth resistance device.
Background technology
Along with the development of electric utility, intelligent substation level is more and more higher, and transformer station is miniaturization more and more, integrated, and electric network composition is also day by day complicated.Cost for the inspection and maintenance of earthed system in transformer station is more and more higher, and diagnose due to grounding system fault and locate indefinite, too increase the workload of repair and maintenance, reduce the work efficiency of repair and maintenance, the growth of earthed system repair and maintenance time also brings harmful effect to electric system long-time steady operation.The measuring technique of existing substation grounding resistance, generally select to lay grounded screen scheme according to transformer station's location soil resistivity, when building transformer station, one-shot measurement is carried out to stake resistance, and be adopt manually-operated alternating current ammeter-voltmeter method to measure.Because earthed system is subject to various extraneous factor (if the change of burn into soil soil property situation, soil erosion, temperature, humidity, weather, mechanical damage, people are maloperation) impact, grounded screen electric resistance value may be caused to produce larger change, and adopt above-mentioned existing measuring technique can not carry out Real-Time Monitoring to grounding resistance change, the ruuning situation of transformer substation system can not be grasped in real time, thus hidden danger is brought to the normal operation of equipment, facility and personal safety.
Utility model content
The fundamental purpose of the utility model embodiment is to provide a kind of earth resistance device, realizes the change of Real-Time Monitoring grounded screen electric resistance value, avoids because the change of grounding resistance brings hidden danger to the normal operation of equipment, facility and personal safety.
To achieve these goals, the utility model embodiment provides a kind of earth resistance device, described earth resistance device comprises: clamp and detection case, wherein, described clamp comprise: clamp rear end and the clamp front end be made up of two panels jaw, jaw described in two panels connects one end of described clamp rear end by rotating shaft, and the other end of described clamp rear end is fixedly connected with described detection case; When jaw closes described in two panels, form one for entangling the jaw of ground wire, and the circuit of jaw inside described in two panels forms a closed path mutual inductor coil; The multiple shunt resistances, range selector, galvanometer, the rectification amplifier that connect successively is provided with in described detection case; Shunt resistance described in described closed path mutual inductor coil connects.
In one embodiment, above-mentioned detection case also comprises: power port, and described power port connects an AC power by power lead, and described AC power is connected with described closed path mutual inductor coil.
Further, above-mentioned power port comprises: power interface and PE line interface.
In one embodiment, above-mentioned detection case also comprises: signal port, and the output terminal of described rectification amplifier is connected with described signal output port, and described signal port connects a signal receiving end by signal transmssion line.
Further, above-mentioned signal port comprises: communication interface and screen layer.
In one embodiment, above-mentioned detection case also comprises: PE line interface end, and described rectification amplifier is connected with described PE line interface end, and by PE line ground connection.
In one embodiment, when the jaw described in two panels closes, connected by a securing member.
Particularly, the mode that above-mentioned jaw is bolted connects, and described securing member comprises: bolt, nut and pad.
Particularly, above-mentioned jaw is connected by the mode of riveted joint, and described securing member is rivet.
In one embodiment, above-mentioned detection case also comprises: detection case grounding ports, and described detection case grounding ports is by a transmission line ground connection.
The beneficial effects of the utility model are, measure ground loop resistance by jaw, have the features such as simple to operate, time saving and energy saving, antijamming capability is strong, test data is accurate; And due to the change of Real-Time Monitoring grounded screen electric resistance value can be realized, can avoid because the change of grounding resistance brings hidden danger to the normal operation of equipment, facility and personal safety.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1A is the structural representation () according to the earth resistance device 100 of the utility model embodiment;
Figure 1B is the structural representation (two) according to the earth resistance device 100 of the utility model embodiment;
Fig. 1 C is the structural representation (three) according to the earth resistance device 100 of the utility model embodiment;
Fig. 1 D is the structural representation of the test box 2 according to the utility model embodiment;
Fig. 2 is the structural representation of the power port 25 according to the utility model embodiment;
Fig. 3 is the structural representation of the signal port 26 according to the utility model embodiment;
Fig. 4 is the one-piece construction schematic diagram of the earth resistance device 100 of the utility model embodiment;
Fig. 5 is earth resistance device 100 application example figure () of the utility model embodiment;
Fig. 6 is earth resistance device 100 application example figure (two) of the utility model embodiment;
Fig. 7 is earth resistance device 100 application example figure (three) of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of earth resistance device.Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in Figure 1A, this earth resistance device 100 comprises: clamp 1 and detection case 2.Below the concrete structure of these clamp 1 and detection case 2 is introduced respectively.
These clamp 1 comprise: clamp rear end 11 and clamp front end 12, and this clamp front end 12 is made up of two panels jaw 13, and two panels jaw 13 is connected with one end of clamp rear end 11 by rotating shaft 14, and the other end of clamp rear end 11 is fixedly connected with this detection case 2.This two panels jaw 13 can be opened by this rotating shaft 14 or close, and in order to the resistance of earth wire 3 is measured, when two panels jaw 13 opens, this ground wire 3 need be put into the jaw of clamp 1, then closed two panels jaw 13.When two panels jaw 13 closes, one can be formed for entangling the jaw of this ground wire 3, and now the circuit of two panels jaw 13 inside forms a closed path mutual inductor coil.
In one embodiment, as shown in Figure 1B, when above-mentioned two panels jaw 13 closes, can be connected by a securing member 15.During concrete enforcement, above-mentioned securing member 15 comprises: bolt, nut and pad, and the mode that two panels jaw 13 is bolted connects.Or, select rivet as above-mentioned securing member 15, two panels jaw 13 connected by the mode of riveted joint.It should be noted that, above-mentioned connected mode is only citing, and and be not used to restriction the utility model embodiment, other connected mode also can be adopted in practical application to be linked together by two panels jaw 13, when making it closed, form above-mentioned closed path mutual inductor coil.
As shown in figure ip, multiple shunt resistance 21, range selector 22, galvanometer 23, rectification amplifier 24 is provided with in above-mentioned detection case 2.Particularly, each shunt resistance 21 is connected in parallel, and is connected with above-mentioned closed path mutual inductor coil.This range selector 22 can select with each shunt resistance 21 that one of them is connected, switched between multiple shunt resistance 21 by this range selector 22, this detection case 2 can be made to have multiple gear, such as, when being provided with three shunt resistances 21, the range of this detection case 2 can be made to be divided into three gears, is 0 ~ 1 Ω .1 ~ 10 Ω and 10 ~ 100 Ω respectively.It should be noted that, the shunt resistance of three shown in Fig. 1 D, only illustrates, in practical application, can according to measure range need one or more shunt resistance is set, the utility model is not as limit.
This galvanometer 23 is connected with range selector 22, in order to test the current value of this galvanometer 23 place branch road.One end of this rectification amplifier 24 is connected with galvanometer 23, in order to by after the electric current of rectification amplifier 24 amplifies, is exported by the output terminal of rectification amplifier 24.
As shown in Figure 1 C, this detection case 2 is provided with PE line interface end 27 and a detection case earth terminal 28, one end of above-mentioned rectification amplifier 24 is connected with this PE line interface end 27, and PE line interface end 27 is by PE line ground connection.This detection case earth terminal 28 passes through a transmission line ground connection, to ensure the normal work of detection case 2.
In practical application, as shown in Figure 1B and Fig. 1 C, this detection case 2 also includes a power port 25, and this power port 25 is connected with an AC power by power lead, and this AC power is connected with above-mentioned closed path mutual inductor coil by power port 25.By this AC power, exchange current can be provided for this closed path mutual inductor coil, thus make this closed path mutual inductor coil produce induction current.As shown in Figure 2, this power port 25 includes power interface 251 and PE line interface 252.In one embodiment, can selection work voltage be the AC power of AC220V ± 10% (frequency is 50Hz), but the utility model is not as limit, the AC power of different operating voltage can be selected to provide exchange current according to the environment of embody rule and condition.
As shown in Figure 1B and Fig. 1 C, this detection case 2 also includes a signal port 26, and one end of this signal port 26 is connected with the output terminal of above-mentioned rectification amplifier 24, and the other end is connected with a signal receiving end.The signal that this rectification amplifier 24 exports transfers to this signal receiving end by this signal port 26, is further analyzed with the signal exported detection case 2.As shown in Figure 3, this signal port 26 includes communication interface 261 and screen layer 262.In one embodiment, the communication interface meeting serial communication RS232 or RS485 can be adopted as above-mentioned communication interface 261.The communication interface specifically selected can adjust according to the communication environment needed in practical application, and the utility model is not as limit.
In sum, utilize the earth resistance device of the utility model embodiment, measure ground loop resistance by jaw, there is the features such as simple to operate, time saving and energy saving, antijamming capability is strong, test data is accurate; And due to the change of Real-Time Monitoring grounded screen electric resistance value can be realized, can avoid because the change of grounding resistance brings hidden danger to the normal operation of equipment, facility and personal safety.
Below be described the clamp 1 of the earth resistance device 100 of the utility model embodiment and the structure of detection case 2 respectively, the one-piece construction now in conjunction with earth resistance device 100 is described.
Fig. 4 is the one-piece construction schematic diagram of the earth resistance device 100 of the utility model embodiment, and as shown in Figure 4, in figure, E is ground wire to be measured; P is current potential earthing pole, is grounded by above-mentioned PE line interface end 27; C is current earthing pole, is connected with an AC power U, is grounded by the PE line interface 252 of above-mentioned power port 25.
Current transformer L is namely corresponding to the closed path mutual inductor coil formed when the two panels jaw 13 of clamp 1 closes in earth resistance device 100, this current transformer L is connected with AC power U, during concrete enforcement, this AC power U is connected with above-mentioned closed path mutual inductor coil by the power port 25 of detection case 2.
Three shunt resistance R
1, R
2, R
3be connected in parallel, and three shunt resistance R
1, R
2, R
3wherein one end be all connected with current transformer L, shunt resistance R
1, R
2, R
3the other end be connected with range selector S-phase, by range selector S at shunt resistance R
1, R
2, R
3between switch, to change the range of this detection case 2.It should be noted that, the shunt resistance of three shown in Fig. 4, only illustrates, in practical application, can according to measure range need one or more shunt resistance is set, the utility model is not as limit.
Galvanometer G is connected respectively with rectification amplifier and this range selector S, the output OUT of this rectification amplifier is connected with a signal receiving end by the signal port 26 of above-mentioned detection case 2, to this signal receiving end transmission output signal, to be further analyzed this output signal follow-up.
Below in conjunction with several concrete test case, the range of application of the earth resistance device 100 of the utility model embodiment and handling characteristics are illustrated.
When needing to measure in the indoor and outdoor of buildings or facility, measurements use can be carried out according to position as shown in Figure 5 or Figure 6 according to the difference of grounding body and earth point.
Fig. 5 is the schematic diagram of earth resistance device 100 when outdoor is measured using the utility model embodiment, and particularly, shown in Fig. 5 is measure the connection of the lightning protection pole line 51 that buildings 52 is arranged.When earth resistance device 100 is placed on lightning protection pole line 51 is measured time, by Real-Time Monitoring, understand the connection of lightning protection pole line, avoid the potential safety hazard occurred because the problem of lightning protection pole line occurs.When earth resistance device 100 is placed on ground wire 53 is measured time, the on-line monitoring of resistance detection and Grounding can be grounded.
Fig. 6 is the schematic diagram of earth resistance device 100 when indoor are measured using the utility model embodiment, particularly, earth resistance device 100 can be arranged on downlead 62 or the earth point place of bus-bar 61.Wherein, earth mat 63 is artificial earth electrode, also can be natural grounding substance.As shown in Figure 6, be this earth resistance device 100 is arranged on downlead 62 measure, the on-line monitoring of resistance detection and Grounding can be grounded.
As shown in Figure 7, in some specific facilities (the tower bar as Along Railway), the earth resistance device 100 of the utility model embodiment can be used to be grounded the detection of resistance and the Real-Time Monitoring of Grounding.Railway or transmission system tower bar require that ground connection is good, carry out by the position shown in Fig. 7 the Real-Time Monitoring measuring detection and the Grounding that can realize the rod grounded resistance of tower.It should be noted that, the position shown in Fig. 7 is only and illustrates, in practical application, can need to determine monitoring location according to the measurement of reality.
The earth resistance device of the utility model embodiment is adopted to carry out the test of the stake resistance of electric system, can be applicable in multiple different environment, simple to operate, time saving and energy saving, and due to the change of Real-Time Monitoring grounded screen electric resistance value can be realized, can avoid because the change of grounding resistance brings hidden danger to the normal operation of equipment, facility and personal safety.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; and be not used in restriction protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. an earth resistance device, is characterized in that, described earth resistance device comprises: clamp and detection case, wherein,
Described clamp comprise: clamp rear end and the clamp front end be made up of two panels jaw, and jaw described in two panels connects one end of described clamp rear end by rotating shaft, and the other end of described clamp rear end is fixedly connected with described detection case; When jaw closes described in two panels, form one for entangling the jaw of ground wire, and the circuit of jaw inside described in two panels forms a closed path mutual inductor coil;
The multiple shunt resistances, range selector, galvanometer, the rectification amplifier that connect successively is provided with in described detection case; Shunt resistance described in described closed path mutual inductor coil connects.
2. earth resistance device according to claim 1, it is characterized in that, described detection case also comprises: power port, and described power port connects an AC power by power lead, and described AC power is connected with described closed path mutual inductor coil.
3. earth resistance device according to claim 2, is characterized in that, described power port comprises: power interface and PE line interface.
4. earth resistance device according to claim 1, it is characterized in that, described detection case also comprises: signal port, and the output terminal of described rectification amplifier is connected with described signal output port, and described signal port connects a signal receiving end by signal transmssion line.
5. earth resistance device according to claim 4, is characterized in that, described signal port comprises: communication interface and screen layer.
6. earth resistance device according to claim 1, is characterized in that, described detection case also comprises: PE line interface end, and described rectification amplifier is connected with described PE line interface end, and by PE line ground connection.
7. earth resistance device according to claim 1, is characterized in that, when the jaw described in two panels closes, is connected by a securing member.
8. earth resistance device according to claim 7, is characterized in that, the mode that described jaw is bolted connects, and described securing member comprises: bolt, nut and pad.
9. earth resistance device according to claim 7, is characterized in that, described jaw is connected by the mode of riveted joint, and described securing member is rivet.
10. earth resistance device according to claim 1, is characterized in that, described detection case also comprises: detection case grounding ports, and described detection case grounding ports is by a transmission line ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420429269.7U CN204044251U (en) | 2014-07-31 | 2014-07-31 | A kind of earth resistance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420429269.7U CN204044251U (en) | 2014-07-31 | 2014-07-31 | A kind of earth resistance device |
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| Publication Number | Publication Date |
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| CN204044251U true CN204044251U (en) | 2014-12-24 |
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| CN201420429269.7U Expired - Lifetime CN204044251U (en) | 2014-07-31 | 2014-07-31 | A kind of earth resistance device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110402074A (en) * | 2019-08-15 | 2019-11-01 | 国家电网有限公司 | A kind of screening arrangement suitable for clamp current transducer |
| CN111896779A (en) * | 2020-07-21 | 2020-11-06 | 贵州电网有限责任公司 | Voltage caliper of metering and detecting instrument |
-
2014
- 2014-07-31 CN CN201420429269.7U patent/CN204044251U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110402074A (en) * | 2019-08-15 | 2019-11-01 | 国家电网有限公司 | A kind of screening arrangement suitable for clamp current transducer |
| CN111896779A (en) * | 2020-07-21 | 2020-11-06 | 贵州电网有限责任公司 | Voltage caliper of metering and detecting instrument |
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| GR01 | Patent grant | ||
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Granted publication date: 20141224 |
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| CX01 | Expiry of patent term |