CN206248727U - The short circuit copper bar or copper braid over braid of contact resistance can be surveyed - Google Patents
The short circuit copper bar or copper braid over braid of contact resistance can be surveyed Download PDFInfo
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- CN206248727U CN206248727U CN201621399306.XU CN201621399306U CN206248727U CN 206248727 U CN206248727 U CN 206248727U CN 201621399306 U CN201621399306 U CN 201621399306U CN 206248727 U CN206248727 U CN 206248727U
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- copper
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- short circuit
- cable
- contact resistance
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Abstract
The utility model discloses a kind of short circuit copper bar or copper braid over braid for surveying contact resistance.Cable in Practical Project is all more long, it is impossible to carry out wiring measurement from cable two ends, it is therefore desirable to which short circuit one end measures in the other end, always there is larger contact resistance influence measurement result in short circuit.The utility model includes main body, the side of the main body is provided with three the first copper lugs for being connected with cable lead-out end to be measured, the opposite side of main body is provided with three and uses the second copper lug, the madial wall of the copper lug to be close to the side wall of main body with the one-to-one measured material measurement of first copper lug.The utility model eliminates influence of the contact resistance to cable D.C. resistance in actual measurement, can accurately obtain the D.C. resistance of cable.
Description
Technical field
The utility model is related to survey the structure of contact resistance, specifically a kind of short circuit copper bar for surveying contact resistance
Or copper braid over braid.
Background technology
Power cable line parameter and power cable metal sheath earthing mode, overhead cabling method and cable laying
The scene such as soil environment practical factor is closely related, therefore, the parameter of dispatching from the factory of cable is only capable of the reference tested as line parameter circuit value
Value, and cannot function as the basis of system short-circuit Current calculation, relay protection setting.Therefore need to being laid in Practical Project
Cable carry out the measurement of associated electrical parameters, the measurement of wherein cable D.C. resistance is a wherein very important part,
Such as D.C. resistance affects many telegram in reply cables degree of unbalancedness in parallel, if carrying out parallel connection from the cable that D.C. resistance differs greatly
More serious current-carrying capacity energy imbalance can be caused, therefore accurately the D.C. resistance of measurement cable has very important significance.
Impedance is very small in itself for cable, and its impedance is collectively constituted by resistance and induction reactance, and electricity is measured in Practical Project
During cable D.C. resistance, because cable run is more long, copper bar or copper litz wire short circuit three-phase typically are used in cable one end, another
One end measures wherein two D.C. resistances of cable, and it is straight that the result of gained is cable unit length divided by the overall length of two cables
Leakage resistance, but can there is larger contact resistance in short circuit, and the order of magnitude of the contact resistance is ohm rank, and cable
D.C. resistance is milliohm rank, therefore is had a great impact to measurement result, and causing can not be accurately obtained the straight of cable run
Leakage resistance value.In sum, contact resistance when should subtract short circuit when cable D.C. resistance is measured, so as to obtain more accurate
D.C. resistance.
General cable D.C. resistance is all measured using both arms direct-current bridge, and double bridge method is used for surveying 1 below Ω's
Resistance；Electric current rule can use different electric currents according to the difference of premeasuring resistance, and measurement range is relatively wide, double bridge method
Measurement uses four terminal measured materials, can eliminate because test line resistance and contact resistance are to the influence caused by measurement.In measurement
Shi Shouxian is prepared and constant temperature treatment to cable sample, and it is small that the preceding sample of measurement stands storage 24 in laboratory with constant temperature and constant humidity
When, reach and ambient temperature equilibrium, in sample stands constant temperature storage and measurement process, all enter in constant temperature laboratory
OK, it is to avoid the change of environment temperature causes the influence of temperature rise of conductor and conductor temperature change to conductor DC resistance certainty of measurement.
Select rational fixture to be taken multiple measurements using both arms direct-current bridge afterwards, take its average value.
At present, generally the method for measurement cable D.C. resistance is only applicable to the measurement to cable sample, is not suitable for reality
Cable measurement in engineering, the most basic difference of both of these case is the length of cable, and sample is shorter can be by both arms direct current
Electric bridge direct wiring measurement, but cable in Practical Project is all more long, it is impossible to carry out wiring measurement from cable two ends, it is therefore desirable to
Short circuit one end measures in the other end, always there is larger contact resistance influence measurement result in short circuit.
Utility model content
Technical problem to be solved in the utility model is the defect for overcoming above-mentioned prior art to exist, there is provided one kind can be surveyed
The short circuit copper bar or copper braid over braid of contact resistance, to exclude influence of the contact resistance to cable D.C. resistance in actual measurement,
The accurate D.C. resistance for obtaining cable in actual measurement.
Therefore, the utility model is adopted the following technical scheme that：The short circuit copper bar or copper braid over braid of contact resistance can be surveyed, is wrapped
Include main body, the side of the main body is provided with three the first copper lugs for being connected with cable lead-out end to be measured, main body it is another
Side be provided with three with first copper lug one-to-one measured material the second copper lug of measurement, the copper lug it is interior
Side wall is close to the side wall of main body.
When cable D.C. resistance is measured, due to D.C. resistance, size is milliohm magnitude in itself, if effectively control does not connect
Get an electric shock resistance, it is very big to cause to measure the D.C. resistance deviation for obtaining, thus in order in excluding actual measurement contact resistance to electricity
The influence of cable D.C. resistance, the utility model provides a kind of short circuit copper bar or copper braid over braid for surveying contact resistance.If in reality
Spacing is excessive between cable is per phase in the engineering of border, should not carry out short circuit using copper bar, can be used with prismatic copper braid over braid generation
Replace.
Further, the first described copper lug is pressed using one with corresponding second copper lug through the screw of main body and one
Nut on copper lug lateral wall is fixedly connected；The first described copper lug runs through master with corresponding second copper lug using one
The screw rod of body is fixedly connected with two nuts being pressed on copper lug lateral wall, and two described nuts are respectively positioned at the two of screw rod
End.Using above two structure, the madial wall of copper lug can be close to the side wall of main body.
Further, the thickness of the main body is 2-3mm.
Further, the width of the main body is 1.4-1.6 times of copper lug diameter.
Further, the spacing of adjacent two copper lug is equal.
Further, the specification and model of the first copper lug are identical with the second copper lug, when cable D.C. resistance is measured
Calculate more convenient.
The utility model has the advantages that：Contact resistance is straight to cable during the utility model eliminates actual measurement
The influence of leakage resistance, can accurately obtain the D.C. resistance of cable.
Brief description of the drawings
Fig. 1-2 is a kind of structural representation of the present utility model.
Fig. 3-4 is another structural representation of the present utility model.
Fig. 5 is circuit diagram when being measured using the utility model.
In figure, 1- main bodys, 2,3, the copper lugs of 4- first, 5,6, the copper lugs of 7- second, 8- screws, 9- nuts, 10- screw rods.
Specific embodiment
With reference to specification drawings and specific embodiments, the utility model is described in further detail.
Embodiment 1
The short circuit copper bar or copper braid over braid of the contact resistance surveyed as shown in Figure 1-2, the side of main body 1 is provided with three to be used for
The first copper lug 2,3,4 being connected with cable lead-out end to be measured, the opposite side of main body 1 is provided with three with first copper lug
One-to-one measured material measurement is close to the second copper lug 5,6,7, the madial wall of the copper lug with the side wall of main body.
The first described copper lug is with corresponding second copper lug is using the screw 8 through main body and is pressed in copper lug outside
Nut 9 on wall is fixedly connected.The thickness of main body is 2-3mm.The width of main body is 1.4-1.6 times of copper lug diameter.It is adjacent
The spacing of two copper lugs is equal.The specification and model of the first copper lug are identical with the second copper lug.
Embodiment 2
The short circuit copper bar or copper braid over braid of the contact resistance surveyed as shown in Figure 3-4, the side of main body 1 is provided with three to be used for
The first copper lug 2,3,4 being connected with cable lead-out end to be measured, the opposite side of main body is provided with three with first copper lug
One-to-one measured material measurement is close to the second copper lug 5,6,7, the madial wall of the copper lug with the side wall of main body.
The first described copper lug and the second copper lug are using the screw rod 10 through main body and are pressed on copper lug lateral wall
Two nuts 9 be fixedly connected, described two nuts 9 are respectively positioned at the two ends of screw rod 10.The thickness of main body is 2-3mm.It is main
The width of body is 1.4-1.6 times of copper lug diameter.The spacing of adjacent two copper lug is equal.The specification and type of the first copper lug
It is number identical with the second copper lug.
When carrying out cable direct current resistance m easurem ent using the utility model, comprise the following steps that：
1. cable end piece 1 ', 2 ', 3 ' is opened a way, and is measured using both arms direct-current bridge in cable head, as shown in figure 5,
1,2 ends, 1,3 ends, the resistance at 2,3 ends are measured respectively：Ra+R1+R2+Rb、Ra+R1+R3+Rc、Rb+R2+R3+Rc.
2. cable head open circuit, the resistance at 1 ', 2 ' ends, 1 ', 3 ' ends, 2 ', 3 ' ends is measured in end respectively：R1’+R2’、
R1’+R3’、R2’+R3’。
3. identical treatment when mounted, has been done to six copper lugs, and nut has been tightened using identical torque, therefore
The contact resistance that cable is often got along in theory is approximately the same i.e.：R1=R1 ', R2=R2 ', R3=R3 '.
4. institute's measuring resistance numerical value is passed through, you can solve D.C. resistance of the cable per phase, i.e. Ra, the numerical value of Rb, Rc.
Supplementary notes：R1, R2, R3 be from cable head survey D.C. resistance when, the first copper lug connects with copper bar contact surface
Get an electric shock and hinder, R1 ', R2 ', R3 ' is the contact resistance of copper bar contact surface and the second copper lug.
Below only the utility model preferred embodiment is described, but is not to be construed as the limit to claim
System.The utility model is not only limited to above example, and its concrete structure allows to change.It is all in the utility model independent right
It is required that protection domain in the various change made in protection domain of the present utility model.
Claims (7)
1. the short circuit copper bar or copper braid over braid of contact resistance, including main body can be surveyed（1）, it is characterised in that the main body（1）One
Side is provided with three the first copper lugs for being connected with cable lead-out end to be measured（2、3、4）, the opposite side of main body is provided with three
The second copper lug is used with the one-to-one measured material measurement of first copper lug（5、6、7）, the madial wall of the copper lug
It is close to the side wall of main body.
2. the short circuit copper bar or copper braid over braid for surveying contact resistance according to claim 1, it is characterised in that described
One copper lug is with corresponding second copper lug using a screw for running through main body（8）The nut on copper lug lateral wall is pressed in one
（9）It is fixedly connected.
3. the short circuit copper bar or copper braid over braid for surveying contact resistance according to claim 1, it is characterised in that described
One copper lug and the second copper lug are using a screw rod for running through main body（10）With two nuts being pressed on copper lug lateral wall（9）
It is fixedly connected, two described nuts（9）Screw rod is located at respectively（10）Two ends.
4. the short circuit copper bar or copper braid over braid of the contact resistance surveyed according to Claims 2 or 3, it is characterised in that described
Main body（1）Thickness be 2-3mm.
5. the short circuit copper bar or copper braid over braid of the contact resistance surveyed according to Claims 2 or 3, it is characterised in that described
Main body（1）Width be 1.4-1.6 times of copper lug diameter.
6. the short circuit copper bar or copper braid over braid of the contact resistance surveyed according to Claims 2 or 3, it is characterised in that adjacent
The spacing of two copper lugs is equal.
7. the short circuit copper bar or copper braid over braid of the contact resistance surveyed according to Claims 2 or 3, it is characterised in that first
The specification and model of copper lug are identical with the second copper lug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399306.XU CN206248727U (en) | 2016-12-19 | 2016-12-19 | The short circuit copper bar or copper braid over braid of contact resistance can be surveyed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399306.XU CN206248727U (en) | 2016-12-19 | 2016-12-19 | The short circuit copper bar or copper braid over braid of contact resistance can be surveyed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206248727U true CN206248727U (en) | 2017-06-13 |
Family
ID=59007794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621399306.XU Active CN206248727U (en) | 2016-12-19 | 2016-12-19 | The short circuit copper bar or copper braid over braid of contact resistance can be surveyed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206248727U (en) |
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2016
- 2016-12-19 CN CN201621399306.XU patent/CN206248727U/en active Active
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