CN206930699U - A kind of normalized current output device for Transformer Core Grounding electric current live detection - Google Patents
A kind of normalized current output device for Transformer Core Grounding electric current live detection Download PDFInfo
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- CN206930699U CN206930699U CN201720776961.0U CN201720776961U CN206930699U CN 206930699 U CN206930699 U CN 206930699U CN 201720776961 U CN201720776961 U CN 201720776961U CN 206930699 U CN206930699 U CN 206930699U
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Abstract
The utility model uses a kind of normalized current output device for Transformer Core Grounding electric current live detection, for offsetting environmental magnetic field.The normalized current output device includes normalized current output device, current output terminal, fixing pipe, cable position-limiting tube, wire and clamp on amperemeter, the side of current output device is formed with upper and lower spaced two current output terminals, and the current output terminal in lower section is connected with one end of wire；The current output terminal position cantilevered of the wire periphery is fixed with a fixing pipe, and the fixing pipe is connected with the lower end of a cable position-limiting tube；The other end of wire is connected to the top current output terminal of current output device；Cable position-limiting tube periphery is set with the binding clip of clamp on amperemeter.The device electric current output amplitude, phase fineness adjustment output area and stability on have certain particular/special requirement, coincidence circuit structure must also is fulfilled for freely adjustable requirement in two dimensions, it is ensured that measurement result is more accurate.
Description
Technical field
The utility model belongs to charged electric power apparatus detection field, especially a kind of to be used for Transformer Core Grounding current strap
The normalized current output device of electro-detection.
Background technology
Transformer core single-point grounding under normal circumstances, Transformer Core Grounding electric current generally only have several milliamperes to tens millis
Peace, when the situation of 2 points of transformer core appearance and above ground connection, iron core grounding electric current can increase thousands of times, reach several amperes
To tens amperes, cause a series of failures such as transformer core hot-spot, insulation damages, have a strong impact on power network normal operation.
Therefore, the live detection of Transformer Core Grounding electric current is the important technical for judging running state of transformer.
At present, the live detection of Transformer Core Grounding electric current is carried out usually using clamp on amperemeter, because transformer is transported
More powerful power frequency magnetic field can be produced around during row, therefore more obvious shadow can be brought to the measurement result of clamp on amperemeter
Ring, its influence amount can reach the several times of tested iron core grounding electric current, so as to cause the inaccuracy of measurement result, referring to accompanying drawing
The live detection of Transformer Core Grounding electric current shown in 3 result can be influenceed by environmental magnetic field, cause data inaccurate.
Through research, influence of the environmental magnetic field to clamp on amperemeter measurement result depends primarily on it to magnetic flux in iron core
Influence, ferro-magnetic shield efficiency, placed angle and the pore size of this influence and clamp on amperemeter have relation, it is difficult to by building
The magnetic induction intensity for founding preferable model and measuring certain point is calculated.Therefore, we must use a kind of substitution method, use
Magnetic field caused by power current source, which influences alternative environment magnetic field, to be influenceed, and is finally reached and is offset the effect that environment influences.
Utility model content
The purpose of this utility model is in place of overcome the deficiencies in the prior art, there is provided one kind is used for Transformer Core Grounding
The normalized current output device and system of electric current live detection, to solve, the effect that verifies in the prior art is poor, accuracy is low
Technical problem.
The utility model solves its technical problem and takes following technical scheme to realize：
A kind of normalized current output device for Transformer Core Grounding electric current live detection, transformer pass through transformation
Device iron core grounding cable grounding, this standard current output device is set in the outside of transformer core grounding cable, its feature exists
In：The normalized current output device includes normalized current output device, current output terminal, fixing pipe, cable position-limiting tube, led
Line and clamp on amperemeter, the side of current output device is formed with upper and lower spaced two current output terminals, in lower section
Current output terminal be connected with one end of wire；The current output terminal position cantilevered of the wire periphery is fixed with a fixation
Pipe, the cantilever end of the fixing pipe are connected with a Universal rotary joint, have a cable to limit by sleeve connection in universal adapting centriciput
The lower end of position pipe；The other end of wire stretched out by the upper end of cable fibre pipe and be connected to current output device top electric current it is defeated
Go out terminal；Cable position-limiting tube periphery is set with the binding clip of clamp on amperemeter.
Moreover, the Universal rotary joint and the link position of fixing pipe are provided with a lock sleeve, rotation lock set locking ten thousand
To the swing position of adapter.
Moreover, the radial direction side of the sleeve is provided with a lock, can be by sleeve lock on Universal rotary joint.
Moreover, be set with a supporting plate on cable position-limiting tube below clamp on amperemeter, supporting plate is along cable position-limiting tube
Upper and lower guiding movement, supporting plate lower end middle part hinge fill the upper end of an expansion link, and the lower slide of the expansion link, which is arranged on, to be fixed
Guan Shang, supporting plate can be swung with cable position-limiting tube.
Moreover, expansion link is three-stage screwed pipe, the length of adjustable telescopic rod, supporting plate are capable of in the middle part for rotating expansion link
A stop nut is installed on the cable position-limiting tube of lower section, the stop nut can be along the upper and lower regulation of cable position-limiting tube.
The advantages of the utility model and good effect are：
The utility model provides more accurately and reliably Transformer Core Grounding electric current live detection data, is transported for transformer
Row state estimation provides reliable data supporting, ensures power grid security reliability service.
Brief description of the drawings
Fig. 1 is the utility model structure diagram；
Fig. 2 is the utility model normalized current resource loop schematic diagram to be measured；
Fig. 3 is to use clamp on amperemeter measurement standard electric current resource loop and Transformer Core Grounding cable schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by specific embodiment, and following examples are simply retouched
The property stated, be not limited, it is impossible to limit the scope of protection of the utility model with this.
A kind of normalized current output device for Transformer Core Grounding electric current live detection, transformer 14 pass through change
Depressor iron core grounding cable 15 is grounded, and is set this standard current output device in the outside of transformer core grounding cable, is used for
Transformer Core Grounding electric current carries out live detection；
The normalized current output device includes normalized current output device 1, current output terminal 2, fixing pipe 4, cable
Position-limiting tube 12, wire 13 and clamp on amperemeter 9, the side of current output device are formed with upper and lower spaced two electric currents
Lead-out terminal, the current output terminal in lower section are connected with one end of wire, and the current output terminal position of the wire periphery hangs
It is arm-type to be fixed with a fixing pipe, the cantilever end of the fixing pipe be connected with a Universal rotary joint 6 can in paper left and right directions rotation,
The lower end of a cable position-limiting tube is connected with by sleeve 7 in universal adapting centriciput, the upper end of the cable position-limiting tube is tied to open wide
Structure, the other end of wire 13 are stretched out by the upper end of cable fibre pipe and are connected to the top current output terminal of current output device
Son；Cable position-limiting tube periphery is set with the binding clip of clamp on amperemeter 11.
In order that the direction of detected wire keeps consistent with transformer core grounding cable and stabilization supports, universal turn
Joint and the link position of fixing pipe are provided with a lock sleeve 5, and rotation lock tight set can lock the swing position of Universal rotary joint；
The radial direction side of sleeve is provided with a lock 8, can be by sleeve lock on Universal rotary joint.
For the ease of supporting clamp on amperemeter, a supporting plate 9 is set with the cable position-limiting tube below clamp on amperemeter,
Supporting plate fills the upper end of an expansion link 3 along guiding movement above and below cable position-limiting tube, supporting plate lower end middle part hinge, the expansion link
Lower slide is arranged in fixing pipe, and supporting plate can be swung with cable position-limiting tube.
In order to adjust the height of supporting plate, the expansion link of the present embodiment is three-stage screwed pipe, rotates the middle part of expansion link
It is capable of the length of adjustable telescopic rod, a stop nut 10 is installed on the cable position-limiting tube below supporting plate, the stop nut energy
Enough along the upper and lower regulation of cable position-limiting tube.
According to transformer station high-voltage side bus feature, transformer caused power frequency magnetic field around it is substantially constant in the short time,
Therefore, a constant power current is formed using normalized current source in the utility model, using the electric current in surrounding space
Caused power frequency magnetic field offsets with magnetic field caused by transformer, so as to eliminate clamp on amperemeter in measuring transformer iron core grounding
During electric current by environmental magnetic field influenceed.
The specific testing procedure of the present apparatus is as follows：
(1) constant power current is formed in primary Ioops using normalized current source, the normalized current source output area should be 0
Ensure that fineness adjustment is not more than 0.1mA in~50mA, phase adjusted fineness is not more than 0.1 °, and current source output stability is not more than
0.1%.In order to reach preferably effect, the cable as loop carrier should can be fixed with the angle adjustable of two dimensions to be set
Meter；
(2) cable that current source connects is adjusted to the angle parallel with Transformer Core Grounding cable, with transformer fe
The distance of heart earth cable is on the premise of ensureing that Transformer Core Grounding measuring device with electricity (clamp on amperemeter 1) can pass through
It is as small as possible；
(3) clamp on amperemeter is clipped on the cable being connected with normalized current source, plane and cable where clamp on amperemeter
Angle vertical；By the amplitude and phase output of constantly regulate current source, make the show value infinite approach zero of clamp on amperemeter, protect
Hold the amplitude and phase of now current source output；
(4) clamp on amperemeter is clipped on transformer core grounding cable and normalized current source cable simultaneously, it is now pincerlike
Show value on ammeter is the virtual value of transformer iron core grounding current.
Although disclosing embodiment of the present utility model and accompanying drawing for the purpose of illustration, those skilled in the art can be with
Understand：Do not departing from the utility model and spirit and scope of the appended claims, it is various replace, change and modifications all be can
Can, therefore, the scope of the utility model is not limited to embodiment and accompanying drawing disclosure of that.
Claims (5)
1. a kind of normalized current output device for Transformer Core Grounding electric current live detection, it is arranged on transformer core and connects
The outside of ground cable, transformer pass through transformer core grounding cable grounding, it is characterised in that：The normalized current output device
It is defeated including normalized current output device, current output terminal, fixing pipe, cable position-limiting tube, wire and clamp on amperemeter, electric current
The side for going out device is formed with upper and lower spaced two current output terminals, and the current output terminal in lower section, which is connected with, leads
One end of line, the current output terminal position cantilevered of the wire periphery are fixed with a fixing pipe, and the cantilever end of the fixing pipe connects
A Universal rotary joint is connected to, the lower end for having a cable position-limiting tube by sleeve connection in universal adapting centriciput；Wire it is another
End is stretched out by the upper end of cable fibre pipe and is connected to the top current output terminal of current output device；Cable position-limiting tube periphery
It is set with the binding clip of clamp on amperemeter.
2. the normalized current output device according to claim 1 for Transformer Core Grounding electric current live detection, its
It is characterised by：The Universal rotary joint and the link position of fixing pipe are provided with a lock sleeve, universal turn of rotation lock set locking
The swing position of joint.
3. the normalized current output device according to claim 1 for Transformer Core Grounding electric current live detection, its
It is characterised by：The radial direction side of the sleeve is provided with a lock, can be by sleeve lock on Universal rotary joint.
4. the normalized current output device according to claim 1 for Transformer Core Grounding electric current live detection, its
It is characterised by：It is set with a supporting plate on cable position-limiting tube below clamp on amperemeter, supporting plate is along above and below cable position-limiting tube
Guiding movement, supporting plate lower end middle part hinge fill the upper end of an expansion link, and the lower slide of the expansion link is arranged in fixing pipe,
Supporting plate can be swung with cable position-limiting tube.
5. the normalized current output device according to claim 1 for Transformer Core Grounding electric current live detection, its
It is characterised by：Expansion link is three-stage screwed pipe, and the length of adjustable telescopic rod, supporting plate lower section are capable of in the middle part for rotating expansion link
Cable position-limiting tube on a stop nut is installed, the stop nut can be along the upper and lower regulation of cable position-limiting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720776961.0U CN206930699U (en) | 2017-06-30 | 2017-06-30 | A kind of normalized current output device for Transformer Core Grounding electric current live detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720776961.0U CN206930699U (en) | 2017-06-30 | 2017-06-30 | A kind of normalized current output device for Transformer Core Grounding electric current live detection |
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| CN206930699U true CN206930699U (en) | 2018-01-26 |
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| CN201720776961.0U Active CN206930699U (en) | 2017-06-30 | 2017-06-30 | A kind of normalized current output device for Transformer Core Grounding electric current live detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
-
2017
- 2017-06-30 CN CN201720776961.0U patent/CN206930699U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
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