CN207440178U - A kind of loop resistance measurement system - Google Patents
A kind of loop resistance measurement system Download PDFInfo
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- CN207440178U CN207440178U CN201721605053.1U CN201721605053U CN207440178U CN 207440178 U CN207440178 U CN 207440178U CN 201721605053 U CN201721605053 U CN 201721605053U CN 207440178 U CN207440178 U CN 207440178U
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- measurement system
- loop resistance
- discharge circuit
- main discharge
- resistance measurement
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Abstract
The utility model provides a kind of loop resistance measurement system, including industrial personal computer, charging module, main discharge circuit, voltage isolation sensor and digital signal processing module, wherein, the industrial personal computer is electrical connected respectively with the charging module, the main discharge circuit, the digital signal processing module, the charging module is also electrical connected with the main discharge circuit, the main discharge circuit is also electrical connected with the voltage isolation sensor, and the voltage isolation sensor is also electrical connected with the digital signal processing module.The utility model is using ultracapacitor as discharge current source, to be full of the super capacitor of charge to measuring loop conductive discharge during measurement, the long wave head dash current of up to kilo-ampere grade will be generated, it is high with measurement stability, measurement result is accurate, the advantages that relative error is small, the problem of being easier to find conducting connecting part loose contact, and antijamming capability is stronger.
Description
Technical field
The utility model is related to loop resistance detection technique field, in particular to a kind of loop resistance measurement system.
Background technology
At present, loop resistance measurement is main difficult in the smaller contact electricity for leading to not accurately measurement electrical contact of measurement electric current
Resistance, contact resistance belong to the small resistor of micro-ohm rank, and the method for traditional measurement micro resistance has voltage drop method and microhmmeter method.Often
DC current source loop resistance measurement instrument, although electric current it is stable, convenient for measurement, the electric current of 100A-600A can only be exported,
The electric current of bigger is generated, equipment cost and weight will all be significantly increased, and cause its portability poor, be unfavorable for site examining and repairing experiment
Development.Using switching and rectifying power supply, volume weight is big for traditional loop resistance test, not Portable belt and function is more single.It adopts
With rectangular pulse power supply, but it is only applicable to non-inductive circuit.Order Oscillating circuit is formed with capacitor and inductor, order Oscillating circuit then may be used
Eliminate inductance by the signal near sample rate current peak value influences caused by measurement result, but its current peak is also only
100A, and the duration is shorter, for eliminating the unfavorable electrical equipment galvanic circle node contact resistance of skin covering of the surface of contact
Resistance value generally in tens micro-ohms to hundreds of micro-ohms, so accurately to measure its resistance value, it is necessary to pass to high current.The survey that country is recommended
Examination electric current be 100A, but with recent studies have indicated that, DC power supply of the loop resistance in 100A and the direct current in 300A
The resistance value measured under source there is must difference, the loop resistance value measured under the current source of 300A is more accurate.It is meanwhile more
A breaker manufacturer finds that the measured value under 1000A electric currents can will more reflect the conducting state of contact, the essence of loop resistance
Really measurement must use the power supply that can export more high current.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of loop resistance measurement system, electric appliance can be accurately measured
The loop resistance of contact advantageously reduces the probability of happening of apparatus failure.
The technical solution adopted in the utility model is：A kind of loop resistance measurement system is provided, including industrial personal computer, charging mould
Block, main discharge circuit, voltage isolation sensor and digital signal processing module, wherein, the industrial personal computer fills respectively with described
Electric module, the main discharge circuit, the digital signal processing module are electrical connected, the charging module also with the main discharge
Circuit is electrical connected, and the main discharge circuit is also electrical connected with the voltage isolation sensor, the voltage isolation sensor
Also it is electrical connected with the digital signal processing module.
In loop resistance measurement system described in the utility model, the main discharge circuit includes ultracapacitor, crystalline substance
Brake tube, current divider and tested electrical equipment, the ultracapacitor are connected with thyristor, current divider, tested electrical equipment formation
Circuit.
In loop resistance measurement system described in the utility model, the main discharge circuit further includes measurement lead, institute
Stating measurement lead includes first resistor and the first inductance.
In loop resistance measurement system described in the utility model, the charging module be charger, the charger
Electrically it is connected with the ultracapacitor.
In loop resistance measurement system described in the utility model, the current divider, tested electrical equipment respectively with institute
Voltage isolation sensor is stated to be electrical connected.
In loop resistance measurement system described in the utility model, the thyristor is electrical connected with the industrial personal computer.
In loop resistance measurement system described in the utility model, the capacitance of the ultracapacitor is 165F, interior
It hinders for 6.3m Ω.
In loop resistance measurement system described in the utility model, the tested electrical equipment is gas-insulated combination electricity
Device.
Loop resistance measurement system provided by the utility model is using ultracapacitor as discharge current source, to be full of during measurement
The super capacitor of charge will generate the long wave head dash current of up to kilo-ampere grade, have and survey to measuring loop conductive discharge
The advantages that stability is high, and measurement result is accurate, and relative error is small is measured, can be easier to find asking for conducting connecting part loose contact
Topic, and antijamming capability is stronger.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the wire structure diagram of the utility model embodiment；
Fig. 2 is the part circuit structure schematic diagram of the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As depicted in figs. 1 and 2, the loop resistance measurement system that the utility model embodiment provides, including industrial personal computer 1, fills
Electric module 2, main discharge circuit 3, voltage isolation sensor 4 and digital signal processing module 5, wherein, industrial personal computer 1 is respectively with filling
Electric module 2, main discharge circuit 3, digital signal processing module 5 are electrical connected, charging module 2 also with 3 electrical phase of main discharge circuit
Even, main discharge circuit 3 is also electrical connected with voltage isolation sensor 4, and voltage isolation sensor 4 is gone back and digital signal processing module
5 are electrical connected.
Specifically, the main discharge circuit 3 in the present embodiment includes ultracapacitor C, thyristor DV0, current divider R0, measurement
Lead and tested electrical equipment.Tested electrical equipment is gas insulated combined electrical equipment (GIS).Measuring lead includes first resistor R1
With the first inductance L1.Ultracapacitor C and thyristor DV0, current divider R0, measurement lead, the formation of tested electrical equipment connects back
Road.Charging module 2 is charger, and charger is in parallel with ultracapacitor C, for charging for ultracapacitor C.Thyristor DV0With
Industrial personal computer 1 is electrical connected, and industrial personal computer 1 can external signal triggering thyristor DV0Conducting makes ultracapacitor C discharge circuit, root
According to ultracapacitor C flash-over characteristics and the relation of loop resistance, to ensure to obtain the dash current of the long wave head of kilo-ampere grade.Current divider
R0, tested electrical equipment be electrical connected respectively with voltage isolation sensor 4, in discharge process, voltage isolation sensor 4 is distinguished
Extract current divider R0With the terminal voltage signal of tested electrical equipment, the conversion through digital signal processing module 5 is sent to industrial personal computer 1
In handled, triggering control of discharge, data acquisition, digital filtering and the waveform that industrial personal computer 1 is responsible for completing ultracapacitor C are cut
It takes, numerical computations, storage and waveform are shown.
Industrial personal computer 1 in the present embodiment controls charging voltage with sending charging instruction after charging current by serial ports, at this point,
Charger charges to ultracapacitor C；After charging, charge circuit disconnects automatically；Industrial personal computer 1 sends triggering command, brilliant lock
Pipe DV0Conducting, ultracapacitor C discharge to circuit；Voltage is amplified with current signal by voltage isolation sensor 4；Amplification
Signal afterwards enters digital signal processing module 5, and is sent into industrial personal computer 1 into line number after the signal received is carried out analog-to-digital conversion
According to processing, storage result simultaneously generates report.
Industrial personal computer 1 in the present embodiment controls charging voltage with sending charging instruction after charging current by serial ports, at this point,
Charger is charged to required voltage to ultracapacitor C；After charging, charge circuit disconnects automatically；Industrial personal computer 1 sends triggering
Instruction, triggering thyristor DV0Conducting, ultracapacitor C discharge through main discharge circuit 3, and measuring loop will generate the impact of kilo-ampere grade
Electric current；Obtained current divider R will be measured0The pressure drop at both ends is converted to current signal；Voltage is isolated with current signal by voltage
Sensor 4 is amplified；Amplified signal enters digital signal processing module 5, and the signal received is carried out modulus and is turned
Industrial personal computer 1 is sent into after changing and carries out data processing, storage result simultaneously generates report.Ultracapacitor C is charged to required by industrial personal computer 1
After voltage, V is triggeredD0After conducting, capacitance C discharges through main discharge circuit 3, and measuring loop will generate the impact that amplitude is kilo-ampere grade
Electric current；The pressure drop for measuring obtained current divider R both ends is converted into current signal, the pressure drop at GIS contacts both ends is believed as voltage
Number, the size of contact resistance can be calculated.
The measurement of loop resistance is using ultracapacitor C as discharge current source, when the super capacitor full of charge during measurement
To measuring loop conductive discharge, the long wave head dash current of up to kilo-ampere grade will be generated, is returned with meeting measurement electrical equipment
The requirement of road resistance.The capacitance of ultracapacitor C is very big, can reach tens or even hundreds of farads, and general be tested is led
Certain inductance characteristic can be all presented in electrical connector, and the inductive component of tested conducting connecting part is smaller, so main discharge returns
Road 3 is non-oscillatory circuit.When electric current reaches maximum, the change rate of circuit dash current is close to zero, at this time the pressure drop in circuit
Signal is pure resistance pressure drop, and the size of this resistance will mainly reflect conducting rod contact situation.
The capacitance of ultracapacitor C is up to 83F, charging voltage DC48V.Its maximum direct current equivalent series resistance is 10m
Ω, internal resistance are ultralow；Under 65 DEG C of maximum operating temperature can continuous work 1500 it is small when, repeat charge and discharge number up to one
Million times.On the basis of in-site measurement requirement and portability is taken into full account, the present embodiment uses capacitance C as 165F, internal resistance r
For the ultracapacitor of 6.3m Ω, quality 13kg.Under the conditions of general on-the-spot test, ultracapacitor C can meet production
The requirement of raw kilo-ampere grade peak point current.
The embodiment of the utility model is described above in association with attached drawing, but the utility model is not limited to
The specific embodiment stated, above-mentioned specific embodiment is only schematical rather than restricted, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (8)
1. a kind of loop resistance measurement system, which is characterized in that including industrial personal computer, charging module, main discharge circuit, voltage isolation
Sensor and digital signal processing module, wherein, the industrial personal computer respectively with the charging module, the main discharge circuit,
The digital signal processing module is electrical connected, and the charging module is also electrical connected with the main discharge circuit, and the master is put
Electrical circuit is also electrical connected with the voltage isolation sensor, the voltage isolation sensor also with the Digital Signal Processing mould
Block is electrical connected.
2. loop resistance measurement system according to claim 1, which is characterized in that the main discharge circuit includes super electricity
Container, thyristor, current divider and tested electrical equipment, the ultracapacitor and thyristor, current divider, tested electrical equipment shape
Into series loop.
3. loop resistance measurement system according to claim 1, which is characterized in that the main discharge circuit further includes measurement
Lead, the measurement lead include first resistor and the first inductance.
4. loop resistance measurement system according to claim 2, which is characterized in that the charging module be charger, institute
Charger is stated with the ultracapacitor to be electrically connected.
5. loop resistance measurement system according to claim 2, which is characterized in that the current divider, tested electrical equipment
It is electrical connected respectively with the voltage isolation sensor.
6. loop resistance measurement system according to claim 2, which is characterized in that the thyristor is electromechanical with the industry control
Property is connected.
7. loop resistance measurement system according to claim 2, which is characterized in that the capacitance of the ultracapacitor is
165F, internal resistance are 6.3m Ω.
8. loop resistance measurement system according to claim 2, which is characterized in that the tested electrical equipment is exhausted for gas
Edge combined electrical apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721605053.1U CN207440178U (en) | 2017-11-27 | 2017-11-27 | A kind of loop resistance measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721605053.1U CN207440178U (en) | 2017-11-27 | 2017-11-27 | A kind of loop resistance measurement system |
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| CN207440178U true CN207440178U (en) | 2018-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239490A (en) * | 2018-11-28 | 2020-06-05 | 波音公司 | Differential capacitive probe for measuring contact resistance |
-
2017
- 2017-11-27 CN CN201721605053.1U patent/CN207440178U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239490A (en) * | 2018-11-28 | 2020-06-05 | 波音公司 | Differential capacitive probe for measuring contact resistance |
| CN111239490B (en) * | 2018-11-28 | 2023-08-29 | 波音公司 | Differential capacitive probe and method for measuring contact resistance |
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