CN209624685U - A kind of circuit resistance tester influenced for excluding induced electricity - Google Patents
A kind of circuit resistance tester influenced for excluding induced electricity Download PDFInfo
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- CN209624685U CN209624685U CN201821668180.0U CN201821668180U CN209624685U CN 209624685 U CN209624685 U CN 209624685U CN 201821668180 U CN201821668180 U CN 201821668180U CN 209624685 U CN209624685 U CN 209624685U
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- wire clamp
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- circuit resistance
- resistance tester
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Abstract
The utility model relates to circuit resistance tester technical fields, more particularly, to a kind of for excluding the circuit resistance tester of induced electricity influence.Circuit resistance tester includes being electrically connected for the ac input end of input AC electricity and with the ac input end for adjusting the rectification unit of alternating current, and the output end of rectification unit has been electrically connected the first wire clamp and the second wire clamp；It is parallel between the electric current pole of first wire clamp and the electric current pole of the second wire clamp for filtering faradic first filter unit；Sampling unit is parallel between the voltage pole of first wire clamp and the voltage pole of second wire clamp, sampling unit is electrically connected with the second filter unit for filtering AC compounent, second filter unit is electrically connected with A/D converter, and A/D converter is electrically connected with the processor equipped with display module.The utility model structure is simple, improves test result accuracy, while also avoiding damage of the high voltage induction electricity to circuit resistance tester.
Description
Technical field
The utility model relates to circuit resistance tester technical fields, more particularly, to one kind for excluding induced electricity
The circuit resistance tester of influence.
Background technique
According to the requirement of preventive trial regulation and job instruction, breaker is required to carry out loop resistance measurement examination
It tests.The D.C. resistance of the every phase galvanic circle of breaker, the contact resistance of actually dynamic and static contact.Running breaker
Contact resistance increases, it will overheats contact under running current, especially when passing through failed shorted electric current, may make to touch
Head hot-spot, the insulation for the surrounding that may burn when serious even causes contact scorification to cohere, to influence the tripping of breaker
Time and connecting-disconnecting function, or even tripping situation occurs.
When carrying out loop resistance test, if live induced electricity is more strong, induced electricity is added in circuit resistance tester two
End, can be considered an equivalent source, influence tester normal work, so that measurement result is not accurate enough, it may if serious
Damage tester.To solve faradic influence, live processing method is that circuit resistance tester is added to a shell to connect
Ground wire, it is ensured that the earthing of casing is good, completes the measurement of loop resistance, but such wiring is in addition to the work of increase testing crew
Amount, reduces except test efficiency and safety, and cannot accomplish to exclude interference of the induced electricity to circuit resistance tester completely,
It cannot ensure measurement data entirely accurate, also carry out risk for test tape.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of for excluding returning for induced electricity influence
Road resistance meter.
In order to solve the above technical problems, the technical solution adopted in the utility model is: one kind is for excluding induced electricity influence
Circuit resistance tester, including the ac input end for input AC electricity and the use being electrically connected with the ac input end
In the rectification unit of adjusting alternating current, the output end of the rectification unit has been electrically connected the first wire clamp and the second wire clamp；
The electric current pole of first wire clamp and be parallel with for filtering faradic first filter unit between the electric current pole of the second wire clamp；The
Be parallel with sampling unit between the voltage pole of one wire clamp and the voltage pole of the second wire clamp, the sampling unit be electrically connected with for
The second filter unit of AC compounent is filtered, second filter unit is electrically connected with A/D converter, and the A/D converter is electrically connected
It is connected to the processor equipped with display module.
In the technical scheme, alternating current is inputted by ac input end, and rectification unit carries out the alternating current of input whole
It is fixed, the alternating current of input is adjusted as the DC constant current power supply of 100A 6V, influence of the alternating current to measurement data is avoided；First
The electric current of the electric current pole of wire clamp and the second wire clamp extremely on the first filter unit can filter out the high pressure at high-voltage switch gear both ends
Induced electricity avoids influence of the high voltage induction electricity to direct current signal；The voltage pole of the voltage pole of first wire clamp and the second wire clamp it
Between the sampling unit that is arranged, can be used for the voltage signal of acquisition circuit resistance, the second filter unit is electrically connected with sampling unit,
Second filter unit can filter out the first wire clamp and exchange shunting on voltage pole on the second wire clamp to obtain no impurity
DC component；A/D converter can will be converted into digital signal by the analog voltage signal of the second filter unit processing, and
It is shown by the processor with display module, realizes the precise measurement of loop resistance, while also avoiding high pressure sensitivity
Answer electricity damage instrument.
Preferably, voltage regulation unit is provided between the rectification unit and first wire clamp and the second wire clamp.At this
In technical solution, the available metastable voltage of the setting of voltage regulation unit ensure that the accuracy of loop resistance measurement.
Preferably, overvoltage protective unit is electrically connected between the ac input end and the rectification unit.In this skill
In art scheme, the excessively high alternating voltage that the setting of overvoltage protective unit can input causes to damage to circuit resistance tester
It is bad.
Preferably, first filter unit is high-voltage capacitance.The setting of high-voltage capacitance avoid high voltage induction electricity to return
The influence of road resistive voltage data acquisition.
Compared with prior art, the utility model has the beneficial effects that
The utility model ensure that circuit resistance tester under electromagnetic induction voltage with higher, tests out height and presses off
Accurate resistance value is closed, test result accuracy is improved, shortens equipment power off time, improve test efficiency；It also keeps away simultaneously
Exempt from damage of the high voltage induction electricity to circuit resistance tester, effectively avoids induced electricity to testing crew personal safety and test equipment
Bring risk improves testing crew safety, increases instrument service life.
Detailed description of the invention
Fig. 1 is the module map of the utility model.
Specific embodiment
The utility model is further described With reference to embodiment.Wherein, being given for example only property of attached drawing
Illustrate, expression is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；In order to which this reality is better described
With novel embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To ability
For field technique personnel, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the utility model embodiment；It is practical at this
In novel description, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore retouch in attached drawing
The term for stating positional relationship only for illustration, should not be understood as the limitation to this patent, for the common skill of this field
For art personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiment
Fig. 1 be it is a kind of for exclude induced electricity influence circuit resistance tester embodiment, including be used for input AC
The ac input end 1 of electricity and the rectification unit 2 for being used to adjust alternating current being electrically connected with ac input end 1, rectification unit 2
Output end has been electrically connected the first wire clamp 3 and the second wire clamp 4；The electric current pole 5 of first wire clamp and the electric current pole 6 of the second wire clamp
Between be parallel with for filtering faradic first filter unit 7；The voltage pole 8 of first wire clamp and the voltage pole 9 of the second wire clamp
Between be parallel with sampling unit 10, sampling unit 10 is electrically connected with the second filter unit 11 for filtering AC compounent, second
Filter unit 11 is electrically connected with A/D converter 12, and A/D converter 12 is electrically connected with the processor 14 equipped with display module 13.
Wherein, voltage regulation unit 15 is provided between rectification unit 2 and the first wire clamp 3 and the second wire clamp 4.
In addition, being electrically connected with overvoltage protective unit 16 between ac input end 1 and rectification unit 2.
Wherein, the first filter unit 7 is high-voltage capacitance.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of the utility model claims.
Claims (4)
1. a kind of for excluding the circuit resistance tester of induced electricity influence, it is characterised in that: including for input AC electricity
Ac input end (1) and the rectification unit (2) for being used to adjust alternating current being electrically connected with the ac input end (1), it is described
The output end of rectification unit (2) has been electrically connected the first wire clamp (3) and the second wire clamp (4)；The electric current pole (5) of first wire clamp
It is parallel between the electric current pole (6) of the second wire clamp for filtering faradic first filter unit (7)；The voltage of first wire clamp
It is parallel with sampling unit (10) between pole (8) and the voltage pole (9) of the second wire clamp, the sampling unit (10), which is electrically connected with, to be used for
The second filter unit (11) of AC compounent is filtered, second filter unit (11) is electrically connected with A/D converter (12), described
A/D converter (12) is electrically connected with the processor (14) equipped with display module (13).
2. according to claim 1 a kind of for excluding the circuit resistance tester of induced electricity influence, it is characterised in that: institute
It states and is provided with voltage regulation unit (15) between rectification unit (2) and first wire clamp (3) and the second wire clamp (4).
3. according to claim 2 a kind of for excluding the circuit resistance tester of induced electricity influence, it is characterised in that: institute
It states and is electrically connected with overvoltage protective unit (16) between ac input end (1) and the rectification unit (2).
4. it is according to any one of claims 1 to 3 a kind of for excluding the circuit resistance tester of induced electricity influence, it is special
Sign is: first filter unit (7) is high-voltage capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821668180.0U CN209624685U (en) | 2018-10-15 | 2018-10-15 | A kind of circuit resistance tester influenced for excluding induced electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821668180.0U CN209624685U (en) | 2018-10-15 | 2018-10-15 | A kind of circuit resistance tester influenced for excluding induced electricity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209624685U true CN209624685U (en) | 2019-11-12 |
Family
ID=68442228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821668180.0U Active CN209624685U (en) | 2018-10-15 | 2018-10-15 | A kind of circuit resistance tester influenced for excluding induced electricity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209624685U (en) |
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2018
- 2018-10-15 CN CN201821668180.0U patent/CN209624685U/en active Active
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