CN208872809U - The tester of conductor connection point resistance in a kind of measurement power circuit - Google Patents
The tester of conductor connection point resistance in a kind of measurement power circuit Download PDFInfo
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- CN208872809U CN208872809U CN201821350863.1U CN201821350863U CN208872809U CN 208872809 U CN208872809 U CN 208872809U CN 201821350863 U CN201821350863 U CN 201821350863U CN 208872809 U CN208872809 U CN 208872809U
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Abstract
The utility model provides a kind of tester for measuring conductor connection point resistance in power circuit, including two take electrical components, current transformer one and tester ontology composition.It takes electrical components to be made of line clamping device and conducting wire, when measurement, takes the line clamping device of electrical components to be attempted by the both ends of measured conductor tie point in power circuit respectively, the conducting wire of electrical components is taken to connect with tester ontology, form the measurement circuit of one and power circuit parallel connection；Current transformer one is mounted in power circuit, measures the current value of power circuit；Tester ontology calculates the voltage difference at measured conductor tie point both ends in power circuit, and the resistance of measured conductor tie point is calculated using Ohm's law.The utility model is beneficial in that, the resistance value of conductor connection point in power circuit can be measured without having a power failure, a completely new tester is provided, serves the service work of electric system.
Description
Technical field
The utility model relates to arrive resistivity-measuring devices field, particularly a kind of measurement energized state lower conductor tie point
The tester of resistance.
Background technique
Conductor connection point or switch dynamic/static contact tie point, have that contact resistance becomes larger, manage in electric system
Personnel just need to carry out periodic detection to it；And resistivity-measuring devices currently on the market cannot all survey the position of electrification
Amount, need it is fully powered-off to such tie point, using test equipment carry transformer apply big electric current to tested position,
It can just measure.It is measured using such equipment, needs to have a power failure to electric system, involve power failure, Jiu Huifei
Normal trouble, the frequency for causing administrative staff to carry out active detecting substantially reduce, and lead to the presence and increasing of security risk.
The tester of conductor connection point resistance, provides a complete in a kind of measurement power circuit disclosed by the utility model
New tester serves the service work of electric system, and the electricity of conductor connection point is measured without having a power failure
Resistance value, for whether carry out repair foundation is provided；And the electricity that the effect before repairing and after repairing can be intuitively measured
Hinder tester.
Summary of the invention
To achieve the goals above, the utility model discloses a kind of surveys of conductor connection point resistance in measurement power circuit
Instrument is tried, tester includes two and takes electrical components, current transformer one and tester ontology；
Electrical components are taken to be made of line clamping device and conducting wire, line clamping device selects pincerlike electric current folder；Current transformer one uses
Split core type current transformer.The both ends phase that will very easily electrical components can be taken to be attempted by conducting wire tie point in measurement, simultaneously
The electric current for measuring power circuit using split core type current transformer is also very convenient.
It takes the conducting wire of electrical components to connect with tester ontology, forms the measurement circuit of one and power circuit parallel connection；Measurement
The measuring resistance for a known resistance value of having connected in circuit, and a current transformer two is mounted on measurement circuit.
Tester body interior is also provided with a data processing unit, data processing unit and current transformer one, electricity
The secondary circuit of current transformer two is electrically connected, and is read the current value of power circuit respectively, is measured the current value in circuit；Tester sheet
The outside of body is provided with display, power interface and the operation panel being connected with data processor.
Display can intuitively be shown the result that data processing unit calculates, and power interface can be with
External connection battery is powered data processor, and the resistance value of measuring resistance can be set in operation panel.
Measurement method: since power circuit measured conductor tie point is with the presence of resistance, at the both ends of measured conductor tie point
There is voltage difference, this voltage difference can generate the electric current of a partial pressure to measurement circuit, according to this principle, using Ohm's law into
Row retrospectively calculate, so that it may measure the resistance value of measured conductor tie point, specific calculating process is as follows:
Data processing unit reads current value measured by current transformer two, calculates measurement circuit using Ohm's law
Voltage difference.
According to the principle that parallel circuit, voltage is equal it is found that measuring the voltage difference in circuit, as measured conductor tie point two
The voltage difference at end.
Data processing unit reads current value measured by current transformer one, utilizes Ohm's law again, can calculate
The resistance of measured conductor tie point out.
The utility model is it should be understood that under normal circumstances, conductor connection point in electric system, contact resistance generally exists
Tens micro-ohms between several hundred micro-ohms, measure in circuit concatenated measuring resistance resistance value in several Europe of zero point between several Europe.
Therefore the current value generated in measurement circuit only has several one thousandths in power circuit, greatly reduces the electricity in measurement circuit
Stream；If the resistance of conductor connection point is excessive in electric system, causes the current with partial pressure for measuring circuit excessive, standard can be tuned up
The resistance value of resistance, the electric current in control measurement circuit, can not only guarantee the measurement accuracy for measuring loop current, it can also be ensured that survey
Examination instrument will not damage tester because the electric current for measuring circuit is excessive, so that tester is safer when in use.
In the majority with alternating current in current power circuit, alternating current can generate reactance to tested part, tested in measurement
When the resistance of conductor connection point, needs the reactance value to this part to exclude, measurement could be made more accurate, this is practical
It is novel to be solved by following method:
Measure the reactance value in circuit: due to there is a presence of resistance in measurement circuit, and the resistance value of resistance several Europe of zero point extremely
Between several Europe, and reactance value generally only has several milliohms, the only one thousandth of measuring resistance resistance value, can be ignored.
The reactance value of power circuit: before measuring, the conductor of other same length, same area is selected, according to above-mentioned side
Method is operated and is measured, and the result of measurement is input to data processing unit with control panel；Then measured conductor is connected again
Contact is operated according to the method described above and is measured, and data processing unit directly subtracts the numerical value of input when calculating.Pass through
The method, the result calculated are exactly the excessive part of tested position resistance.If it is conductor in measurement direct current power circuit
The resistance value of tie point, so that it may ignore the operation of this part.
The utility model has the advantages that: electrical components, current transformer one will be taken to be applied directly on power circuit, realized
Without having a power failure, so that it may measure the resistance value of conductor connection point, meanwhile, use the power on electric current, voltage existing for circuit itself into
Row measurement, so that tester disclosed by the utility model, generates high current without using transformer to measure the electricity at tested position
Resistance value, can thus mitigate the weight of tester, and when use is more light.
Detailed description of the invention
Fig. 1: the utility model connection schematic diagram.
Fig. 2: tester main body system schematic diagram.
Fig. 3: measuring principle figure.
1. electrical components are taken current transformer one, 2., 3. measured conductor tie points, 4. tester ontologies, 5. measuring resistances,
6. current transformer two, 7. data processing units, 8. displays, 9. power interfaces, 10. operation panels, 21. line clamping devices, 22.
Conducting wire.
Specific embodiment
The tester of conductor connection point resistance, referring to Fig.1 and schemes in a kind of measurement power circuit disclosed by the utility model
2, tester includes two and takes electrical components 2, current transformer 1 and tester ontology 4；Take electrical components 2 by 21 He of line clamping device
Conducting wire 22 is constituted, and line clamping device 21 selects pincerlike electric current to press from both sides；Current transformer 1 uses split core type current transformer.In measurement,
Pincerlike electric current presss from both sides the both ends that will very easily electrical components 2 can be taken to be attempted by measured wire tie point 3, while utilizing pincerlike electric current
The current value that sensor measures power circuit is also very convenient.
Referring to Fig. 2, two take electrical components 2 to be connected by conducting wire 22 with tester ontology 4, form one and power circuit
Measurement circuit in parallel measures the measuring resistance 5 that a known resistance value is R ' of having connected in circuit, and pacifies on measurement circuit
A current transformer 26 is filled.
A data processing unit 7, data processing unit 7 and current transformer one are also provided with inside tester ontology 4
1, the secondary circuit electrical connection of current transformer 26 reads the current value I of power circuit respectively, measures the current value I ' in circuit；
The outside of tester is provided with display 8, power interface 9 and the operation panel 10 being connected with data processor 7.
Display 8 can intuitively be shown the result that data processing unit 7 calculates, power interface 9
Data processor can be powered with external connection battery, the resistance value R ' of measuring resistance 5 can be set in operation panel 10.
Referring to Fig.1, pincerlike electric current is clipped in the both ends of measured conductor tie point 3 respectively when test；Again by Current Mutual Inductance
Device 1 is mounted on power circuit, the connection work before measurement can be completed.
Measurement method: referring to Fig. 3, since measured conductor tie point 3 connects with the presence of resistance in measured conductor in power circuit
The both ends of contact 3 there is voltage difference, this voltage difference can generate the electric current I ' of a partial pressure to measurement circuit, according to this principle,
Retrospectively calculate is carried out using Ohm's law, so that it may measure the resistance value of measured conductor tie point, specific calculating process is as follows
(the method is useful in direct current power circuit):
Data processing unit 7 reads measurement loop current value I ' measured by current transformer 26, utilizes Ohm's law meter
Calculate the voltage difference in measurement circuit, i.e. △ U=I ' * R '.
According to the principle that parallel circuit, voltage is equal it is found that measuring the voltage difference in circuit, as measured conductor tie point 3
The voltage difference at both ends.
Data processing unit 7 reads power circuit current value I measured by current transformer 1, fixed using ohm again
Rule, can calculate the resistance of measured conductor tie point, i.e. R=△ U/ (I-I ').
In exchange power circuit, the resistance of conductor connection point is measured, it need to be in measurement measured conductor tie point
Before resistance, the conductor of other same length, same area is selected, is measured according to the method described above, measurement result R ' ',
The result R ' ' of measurement is input to data processing unit with control panel；
In the final step of above-mentioned measurement method, tester can be changed automatically on calculation method, i.e., at data
It manages unit 7 and reads power circuit current value I measured by current transformer 1, using Ohm's law, calculate measured conductor company
Then the sum of the resistance value of contact and reactance value subtract the reactance value R ' ' of input, the resistance of you can get it measured conductor tie point
Value, i.e. R=△ U/ (I-I ')-R ' '.
Finally, it should be noted that the measured conductor tie point referred in the utility model is more than the connection between conducting wire
Position further comprises the connecting portion of connecting portion between the dynamic/static contact of such as switch, isolation switch, as long as with this reality
With novel technological means, the device and method of resistance measurement are carried out to similar connecting portion, all in the protection of the utility model
Within the scope of, while technological means disclosed in the utility model is not limited only to technological means disclosed in above embodiment,
It also includes technical solutions formed by any combination of the above technical features.
Claims (7)
1. the tester of conductor connection point resistance in a kind of measurement power circuit, it is characterised in that:
The tester includes: two and takes electrical components, current transformer one and tester ontology；
It is described that electrical components is taken to be made of line clamping device and conducting wire；
The line clamping device is attempted by the both ends of measured conductor tie point in power circuit respectively；
The conducting wire is connected with tester ontology, forms the measurement circuit of one and power circuit parallel connection；
The current transformer one is mounted in power circuit, measures the current value of power circuit；
The tester ontology calculates the voltage difference at measured conductor tie point both ends, reads the electric current that current transformer one measures
Value, the resistance of measured conductor tie point is calculated using Ohm's law.
2. the tester of conductor connection point resistance in a kind of measurement power circuit according to claim 1, it is characterised in that
Current transformer one is split core type current transformer.
3. the tester of conductor connection point resistance in a kind of measurement power circuit according to claim 1, it is characterised in that
Tester body interior is provided with data processing unit, measuring resistance, current transformer two, and the measuring resistance is serially connected in measurement
In circuit, current transformer two be mounted on measurement circuit on.
4. the tester of conductor connection point resistance in a kind of measurement power circuit according to claim 1, it is characterised in that
Line clamping device is pincerlike electric current folder.
5. the tester of conductor connection point resistance in a kind of measurement power circuit according to claim 1, it is characterised in that
Power interface, display screen and operation panel are provided on tester ontology.
6. the tester of conductor connection point resistance in a kind of measurement power circuit according to claim 3, it is characterised in that
Measuring resistance can be the combination an of adjustable resistance, the resistance series and parallel that can also be multiple and different resistance values.
7. the tester of conductor connection point resistance, feature exist in a kind of measurement power circuit according to claim 2 or 3
It is electrically connected in the secondary circuit of current transformer one, current transformer two with data processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821350863.1U CN208872809U (en) | 2018-08-22 | 2018-08-22 | The tester of conductor connection point resistance in a kind of measurement power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821350863.1U CN208872809U (en) | 2018-08-22 | 2018-08-22 | The tester of conductor connection point resistance in a kind of measurement power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208872809U true CN208872809U (en) | 2019-05-17 |
Family
ID=66465296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821350863.1U Active CN208872809U (en) | 2018-08-22 | 2018-08-22 | The tester of conductor connection point resistance in a kind of measurement power circuit |
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| CN (1) | CN208872809U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740611A (en) * | 2021-07-30 | 2021-12-03 | 深圳供电局有限公司 | System and method for measuring contact resistance of elbow-shaped structure of cable terminal of distribution switch cabinet |
-
2018
- 2018-08-22 CN CN201821350863.1U patent/CN208872809U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740611A (en) * | 2021-07-30 | 2021-12-03 | 深圳供电局有限公司 | System and method for measuring contact resistance of elbow-shaped structure of cable terminal of distribution switch cabinet |
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