CN104950183A - Non-contact grounding line resistance detector - Google Patents
Non-contact grounding line resistance detector Download PDFInfo
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- CN104950183A CN104950183A CN201510429728.0A CN201510429728A CN104950183A CN 104950183 A CN104950183 A CN 104950183A CN 201510429728 A CN201510429728 A CN 201510429728A CN 104950183 A CN104950183 A CN 104950183A
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- grounding line
- line resistance
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Abstract
The invention discloses a non-contact grounding line resistance detector which comprises a microprocessor (1), an amplified filter circuit a (2), an amplified filter circuit b (3), a voltage acquisition circuit (4), a voltage transformer (5), a current transformer (6), a communication interface (7), a normally open-close interface (8) and a jaw (9), wherein the voltage transformer (5) and the current transformer (6) are separately placed at the peripheral positions of the jaw (9); a grounding line penetrates through the jaw (9). When the non-contact grounding line resistance detector operates normally, the grounding line of the power system does not need to be powered off; the non-contact grounding line resistance detector generates a working current during measurement and is independent of the current from the grounding line, so the measurement result is more accurate; besides, an anti-interference layer is arranged on the non-contact grounding line resistance detector, and thus the environmental interference can be effectively filtered out.
Description
Technical field
Invention relates to a kind of resistance detector, particularly a kind of non-contact grounding line resistance detecting device.
Background technology
Resistance is often as the basis for estimation of other indexs of circuit.The frequent fault of ground wire of such as electric system can be stolen, and the resistance value of ground path can as judging the basis for estimation whether ground path is stolen.Therefore testing circuit resistance detector is needed.Existing ground path resistance detector is generally contact, needs to have a power failure, destroy circuit, resistance detector is linked into inside circuit time the resistance detector of contact detects grounding wire of power system road resistance.Electric system has a power failure at every turn all can cause huge economic loss, makes troubles to the normal production of resident, life.And when existing contactless resistance detector work, be generally the source using the electric current of ground path as testing electric current, the shortcoming of this working method is the electric current of ground path is not invariable, the curent change of ground path directly affects the measured value of electronic detectors, in addition, once the power-off of grounding circuit fault, this contactless resistance detector just cannot normally work.
Summary of the invention
The object of the invention is to need outage detection or detected value by the shortcoming of circuit interference for existing resistance detector, a kind of non-contact grounding line resistance detecting device is provided.
For achieving the above object, the present invention is by following Realization of Product:
A kind of non-contact grounding line resistance detecting device, it comprises: microprocessor (1), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4), voltage transformer (VT) (5), current transformer (6), communication interface (7), normal opening and closing interface (8), jaw (9), voltage transformer (VT) (5) summation current transformer (6) is placed in the marginal position of jaw (9) respectively, ground path passes from jaw (9), microprocessor (1) respectively with communication interface (7), normal opening and closing interface (8), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4) is connected, current transformer (6) and filtering and amplifying circuit a(2) be connected, voltage transformer (VT) (5) and filtering and amplifying circuit b(3) be connected, voltage transformer (VT) (5) is connected with voltage collection circuit (4) simultaneously.
Further, it is characterized in that described voltage transformer (VT) (5), current transformer (6) outside is provided with anti-interference layer (10).
Further, it is characterized in that described anti-interference layer forms by three layers: outermost layer is high saturation magnetic flux low permeability layer (10-3), middle layer is high conductivity layer (10-2), innermost layer is low saturation flux high magnetic permeability layer (10-1), every one deck independent grounding, does not connect mutually.
Further, it is characterized in that jaw (9) is divided into upper and lower two parts, connected by screw (11) between two parts.
Effect of the present invention is: product of the present invention adopts non-fit, time the resistance electroprobe of product of the present invention normally works, grounding wire of power system road is without the need to power-off, in addition, product of the present invention is provided with voltage transformer (VT), current transformer, calibration circuit, working current can be produced, without the need to relying on the electric current of grounding circuit, measurement result is more accurate.Product of the present invention often needs the ground path resistance applying to detect electric system, it is many that the characteristic of power equipment determines residing environmental interference, voltage transformer (VT) (5), current transformer (6) outside of product of the present invention are provided with anti-interference layer (10), effectively can filter environmental interference.
Accompanying drawing explanation
A kind of non-contact grounding line resistance of Fig. 1 the present invention detector arrangement schematic diagram.
Fig. 2 non-contact grounding line resistance of the present invention detecting device stube cable ground loop schematic diagram.
Fig. 3 triple-shielded schematic diagram
Embodiment
Below in conjunction with drawings and Examples, the present invention is further elaborated:
A kind of non-contact grounding line resistance detecting device as shown in Figure 1, it comprises: microprocessor (1), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4), voltage transformer (VT) (5), current transformer (6), communication interface (7), normal opening and closing interface (8), jaw (9), voltage transformer (VT) (5) summation current transformer (6) is placed in the marginal position of jaw (9) respectively, ground path passes from jaw (9), microprocessor (1) respectively with communication interface (7), normal opening and closing interface (8), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4) is connected, current transformer (6) and filtering and amplifying circuit a(2) be connected, voltage transformer (VT) (5) and filtering and amplifying circuit b(3) be connected, voltage transformer (VT) (5) is connected with voltage collection circuit (4) simultaneously.
In order to easy for installation, jaw (9) is divided into upper and lower two parts, connected by screw (11) between two parts, during installation, screw (11) unclamps, jaw (9) up and down two parts can separate, and jaw (9) the inside put into by the cable of ground path, and screw (11) is locked and namely installs.
As shown in Figure 2, when non-contact grounding line resistance sensors work, be added to one, cable grounding loop induced voltage U by voltage transformer (VT) (5), microprocessor (1) carries out voltage sample to the induced voltage that this adds, and obtains magnitude of voltage U.Under the effect of sensitive voltage U, cable grounding loop produces induction current I, and current transformer (6) can obtain the value of induction current I, because induction current I is fainter, is therefore also provided with filtering and amplifying circuit a and processes further electric current.Microprocessor is according to Ohm law, and U=IR can calculate the resistance in cable grounding loop.
Meanwhile, non-contact grounding line resistance detecting device can correct before dispatching from the factory.Correction principle tests the ground loop of one group of known different resistance values, whether the resistance value of validation test is consistent with actual conditions, if there is deviation, then remembers deviate in a device according to multiple test point, adjust net result when this product work according to deviate.Namely, during product work of the present invention, microprocessor automatic calibration, demonstrates the resistance in the cable grounding loop finally obtained.
Workplace due to product of the present invention is near high-tension cable, there is very strong magnetic interference, affects the normal work of non-contact grounding line resistance detecting device.Shield technology utilizes metal material to have good absorption to electromagnetic wave and reflection potential is carried out jamproof, good low resistance conductive material or permeability magnetic material is selected according to the feature of electromagnetic interference (EMI), form suitable shield and just can reduce electromagnetic interference (EMI), the effect of shield is like being at equivalent resistance (instrument) two ends a upper short-circuit line in parallel, when undesired signal leaps up fashionable directly by short-circuit line, on equivalent resistance (instrument) almost without impact.General in order to obtain higher shielding properties, need the material using magnetoconductivity higher, but the material of high permeability is easily saturated under high-intensity magnetic field, and if be not easy saturated material with comparing, magnetoconductivity is lower, and shielding properties does not reach requirement again.
As shown in Figure 3, for the singularity in product work place of the present invention, product of the present invention is provided with anti-interference layer (10) in voltage transformer (VT) (5), current transformer (6) outside.Anti-interference layer forms by three layers: outermost layer is high saturation magnetic flux low permeability layer (10-3), middle layer is high conductivity layer (10-2), innermost layer is low saturation flux high magnetic permeability layer (10-1), and every layer of independent grounding, does not connect mutually.When product of the present invention works near high-tension circuit, outermost high saturation magnetic flux low permeability layer (10-3) magnetoconductivity is more relatively low, first disturbing magnetic field intensity H0 is decayed to lower degree H1.Then the high conductivity layer (10-2) in middle layer is used to realize the shielding to electric field.Low saturation flux high magnetic permeability layer (10-1) magnetoconductivity comparatively first floor height of last innermost layer, decays to the magnetic field intensity H1 after decay the H2 not affecting equipment and normally work further.By such triple-shielded process, improve the antijamming capability of product of the present invention, meet the demand worked near high-tension circuit.
Above, be only the embodiment utilizing this origination techniques content, the modification that any those skilled in the art use this creation to do, change, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (4)
1. a non-contact grounding line resistance detecting device, it is characterized in that it comprises: microprocessor (1), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4), voltage transformer (VT) (5), current transformer (6), communication interface (7), normal opening and closing interface (8), jaw (9), voltage transformer (VT) (5) summation current transformer (6) is placed in the marginal position of jaw (9) respectively, ground path passes from jaw (9), microprocessor (1) respectively with communication interface (7), normal opening and closing interface (8), filtering and amplifying circuit a(2), filtering and amplifying circuit b(3), voltage collection circuit (4) is connected, current transformer (6) and filtering and amplifying circuit a(2) be connected, voltage transformer (VT) (5) and filtering and amplifying circuit b(3) be connected, voltage transformer (VT) (5) is connected with voltage collection circuit (4) simultaneously.
2. a kind of non-contact grounding line resistance detecting device as claimed in claim 1, is characterized in that described voltage transformer (VT) (5), current transformer (6) outside is provided with anti-interference layer (10).
3. a kind of non-contact grounding line resistance detecting device as claimed in claim 2, it is characterized in that described anti-interference layer forms by three layers: outermost layer is high saturation magnetic flux low permeability layer (10-3), middle layer is high conductivity layer (10-2), innermost layer is low saturation flux high magnetic permeability layer (10-1), every one deck independent grounding, does not connect mutually.
4. a kind of non-contact grounding line resistance detecting device as claimed in claim 1, is characterized in that jaw (9) is divided into upper and lower two parts, is connected between two parts by screw (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510429728.0A CN104950183A (en) | 2015-07-21 | 2015-07-21 | Non-contact grounding line resistance detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510429728.0A CN104950183A (en) | 2015-07-21 | 2015-07-21 | Non-contact grounding line resistance detector |
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| Publication Number | Publication Date |
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| CN104950183A true CN104950183A (en) | 2015-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510429728.0A Pending CN104950183A (en) | 2015-07-21 | 2015-07-21 | Non-contact grounding line resistance detector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459207A (en) * | 2018-07-06 | 2018-08-28 | 广东电网有限责任公司 | Grounding measurement device and grounding wire detection system |
| CN109633280A (en) * | 2018-11-30 | 2019-04-16 | 陈璐 | A kind of shallow-layer of high-tension apparatus ground line loosens the soil the measuring device with electricity of pole plate folder patch |
| RU2736073C1 (en) * | 2020-03-11 | 2020-11-11 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Петербургский государственный университет путей сообщения Императора Александра I" | Device for earthing resistance measurement |
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2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459207A (en) * | 2018-07-06 | 2018-08-28 | 广东电网有限责任公司 | Grounding measurement device and grounding wire detection system |
| CN109633280A (en) * | 2018-11-30 | 2019-04-16 | 陈璐 | A kind of shallow-layer of high-tension apparatus ground line loosens the soil the measuring device with electricity of pole plate folder patch |
| RU2736073C1 (en) * | 2020-03-11 | 2020-11-11 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Петербургский государственный университет путей сообщения Императора Александра I" | Device for earthing resistance measurement |
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Application publication date: 20150930 |