CN210432335U - Shielding device suitable for clamp type current sensor - Google Patents
Shielding device suitable for clamp type current sensor Download PDFInfo
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- CN210432335U CN210432335U CN201921321688.8U CN201921321688U CN210432335U CN 210432335 U CN210432335 U CN 210432335U CN 201921321688 U CN201921321688 U CN 201921321688U CN 210432335 U CN210432335 U CN 210432335U
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Abstract
The utility model discloses a shielding device suitable for a clamp type current sensor, relating to the technical field of electric power detection equipment; the box cover and the box body cover are connected together in a buckling mode or are matched in a separating mode to form a shielding box used for shielding electromagnetic interference, and a detected wire channel used for penetrating through a detected cable and a detection wire channel used for penetrating through a detection cable on the clamp-on ammeter are arranged on the box body; the accuracy of measuring the current transformer is improved by the aid of the box cover, the box body, the grounding wire and the like.
Description
Technical Field
The utility model relates to an electric power check out test set technical field especially relates to a shield assembly suitable for tong-type current sensor.
Background
A current transformer, abbreviated as CT, is one of the main electrical devices of a transformer substation, converts a large current in a power system into a small current, and plays an indispensable role in relay protection, automatic control, signal indication, electric energy metering, and the like. When the capacitive current transformer is affected with damp or the insulation is reduced, the dielectric loss factor of the capacitive current transformer is changed, and the capacitance is increased. Insulation moisture, deterioration and deterioration of the transformer, and partial defects of penetration and non-penetration can be reflected by measuring the dielectric loss factor of the current transformer.
In order to avoid the limitation of power failure of equipment, a relative dielectric loss factor and capacitance ratio live test method, called as a relative measurement method, is proposed at present, and the test is carried out under the state that the equipment is in live operation. The method comprises the steps of selecting other capacitive equipment connected with tested equipment in parallel as reference equipment, obtaining current signals from end screen grounding wires of the two pieces of equipment at the same time, and analyzing phase angle difference and amplitude ratio of the two current signals to obtain relative dielectric loss factor and capacitance ratio. Because the result is the result calculated by the current signals of the two devices, the interference factors simultaneously acting on the devices are simultaneously eliminated, and the accuracy of the test result is higher.
However, in an actual working environment, the relative measurement method has a plurality of disadvantages:
the commonly used method for obtaining the reference current at the end screen wiring is as follows:
(1) personnel wiring risks equipment that causes the end screen to lose ground.
(2) Personnel wiring has the personal risk that causes the personnel to electrocute.
As shown in fig. 4, the clamp-type ammeter is used for detection, and has the disadvantages that the clamp-type current sensor is exposed in a transformer substation filled with an electromagnetic field, so that electromagnetic interference is very easy to cause, accurate current data cannot be obtained, and further, the relative dielectric loss factor and capacitance ratio cannot be accurately calculated, so that the current sensor cannot be effectively tested, and sudden faults are generated.
Problems with the prior art and considerations:
how to solve the technical problem of improving the accuracy of measuring the current transformer.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a shield assembly suitable for tong-type current sensor is provided, it passes through lid, box body and earth connection etc. has realized improving and has measured the current transformer rate of accuracy.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: including lid, box body and the earth connection of setting on the box body, the lid links together or the separation cooperation and forms the shielding box that is used for shielding electromagnetic interference with the box body lid, is provided with the test line passageway that is used for passing the test cable of being surveyed the cable and is used for passing the test cable on the clip-on ammeter on the box body.
The further technical scheme is as follows: the bottom of the box body is provided with a base.
The further technical scheme is as follows: the ground wire comprises a ground cable and a clamp, and the box body, the ground cable and the clamp are sequentially electrically connected.
The further technical scheme is as follows: the grounding cable is electrically connected with the bottom of the box body.
The further technical scheme is as follows: the tested line channel is a notch which is positioned at the opening part of the box body and is communicated with the outside.
The further technical scheme is as follows: the detection line channel is a through hole which is positioned at the bottom of the box body and is communicated with the outside.
The further technical scheme is as follows: the box cover further comprises a fixing piece arranged on the shielding box and used for fixing the box cover and the box body together.
The further technical scheme is as follows: the fixing piece is a fastening sleeve.
The further technical scheme is as follows: the fixing piece is a rubber sleeve.
The further technical scheme is as follows: the fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve and a second ring sleeve which are connected with each other, the first ring sleeve is sleeved on the grounding wire, and the second ring sleeve is sleeved and fixed with the shielding box together or is in separation fit with the shielding box.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the box cover and the box body cover are connected together in a buckling mode or are matched in a separating mode to form a shielding box used for shielding electromagnetic interference, and a detected wire channel used for penetrating through a detected wire of a detected cable and a detection wire channel used for penetrating through a detection cable on the clamp-on ammeter are arranged on the box body. According to the technical scheme, the accuracy of measuring the current transformer is improved through the box cover, the box body, the grounding wire and the like.
And secondly, a base is arranged at the bottom of the box body. This technical scheme improves the structural strength of box body, and it is more convenient to use, more firm.
And thirdly, the grounding wire comprises a grounding cable and a clamp, and the box body, the grounding cable and the clamp are sequentially and electrically connected. This technical scheme, the performance is more stable, and the sexual valence is better, and the structure is more reasonable.
Fourth, the ground cable is electrically connected to the bottom of the case. This technical scheme, the performance is more stable, and the structure is more reasonable.
Fifthly, the measured line channel is a notch which is positioned at the opening part of the box body and is communicated with the outside. This technical scheme, the performance is more stable, and the structure is more reasonable.
Sixthly, the detection line channel is a through hole which is positioned at the bottom of the box body and is communicated with the outside. This technical scheme, the performance is more stable, and the structure is more reasonable.
Seventhly, the shielding box also comprises a fixing piece which is arranged on the shielding box and used for fastening the box cover and the box body together. This technical scheme, it is more convenient to use, and is more firm, and the performance is more stable, and the structure is more reasonable.
Eighth, the fixing member is a fastening sleeve. The technical scheme has the advantages of convenient use and good cost performance.
Ninth, the fixing piece is a rubber sleeve. The technical scheme has the advantages of more convenient use and better cost performance.
Tenth, the fixing piece is a 8-shaped fixing piece, and includes a first ring sleeve and a second ring sleeve that are connected to each other, the first ring sleeve is sleeved on the ground wire, and the second ring sleeve and the shielding box are sleeved and fixed together or are in separation fit. This technical scheme, it is more convenient to use, and is more firm, and the performance is more stable, and the structure is more reasonable.
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic view of the opened state of the shield case according to the present invention;
FIG. 3 is a schematic diagram illustrating the use of the present invention;
fig. 4 is a schematic diagram illustrating the principle of the prior art.
Wherein: 1 lid, 2 box bodies, 3 bases, 4 gaps, 5 ground cables, 6 clamps, 7 first ring sleeves, 8 second ring sleeves and 9 detection cables.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
Example 1:
as shown in fig. 1 and 2, the utility model discloses a shielding device suitable for clamp type current sensor, including lid 1, box body 2, fix base 3, the welding of 2 lower part side walls of box body in the box body and the earth connection and the mounting of 2 bottoms of box body, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
As shown in fig. 2, a notch 4 communicating with the outside is opened in the opening of the case 2.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
Example 1 description of use:
as shown in fig. 3, during detection, the detection cable 9 of the clip-on ammeter is placed in the box body 2 and penetrates out of the through hole at the bottom of the shielding box, and then is connected to the capacitive equipment live tester. The cable to be measured is clamped and sleeved by the clamp-on ammeter, and the clamp-on ammeter is placed in the box body 2, so that the cable to be measured is positioned in the gap 4. The cover 1 is closed at the opening of the box body 2 to close the shielding box, and the cover 1 and the box body 2 are fixed together by a second ring sleeve 8.
Example 2:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is an iron box cover made of iron.
The box body 2 is an iron box body made of iron.
The base 3 is an iron base made of iron.
The fixing piece is a rubber sleeve.
Example 3:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is an iron box cover made of iron.
The box body 2 is an iron box body made of iron.
The base 3 is an iron base made of iron.
The fixing piece is a rope sling.
Example 4:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is a stainless steel box cover made of stainless steel.
The box body 2 is a stainless steel box body made of stainless steel.
The base 3 is a stainless steel base made of stainless steel.
The fixing piece is a rubber sleeve.
Example 5:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is a stainless steel box cover made of stainless steel.
The box body 2 is a stainless steel box body made of stainless steel.
The base 3 is a stainless steel base made of stainless steel.
The fixing piece is a rope sling.
Example 6:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is a stainless steel box cover made of stainless steel.
The box body 2 is a stainless steel box body made of stainless steel.
The base 3 is a stainless steel base made of stainless steel.
The fixing piece is a rubber sleeve.
The shielding box is a cuboid shielding box.
Example 7:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is a stainless steel box cover made of stainless steel.
The box body 2 is a stainless steel box body made of stainless steel.
The base 3 is a stainless steel base made of stainless steel.
The fixing piece is a rubber sleeve.
The shielding box is a cuboid shielding box.
As shown in fig. 2, the notch 4 is rectangular in front view.
Example 8:
the utility model discloses a shielding device suitable for tong-type current sensor, including lid 1, box body 2, fix base 3, the welding at 2 bottoms of box body of 2 lower parts side walls of box body and mounting, lid 1 links together or separation cooperation and formation are used for shielding electromagnetic interference's shielding box with 2 lid knots of box body.
The opening of the box body 2 is provided with a gap 4 communicated with the outside.
The bottom of the box body 2 is provided with a through hole communicated with the outside.
The earth connection includes ground connection cable 5 and clip 6, box body 2, ground connection cable 5 and clip 6 electricity in proper order connect.
The fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve 7 and a second ring sleeve 8 which are connected with each other, the first ring sleeve 7 is sleeved on the grounding cable 5 of the grounding wire, and the second ring sleeve 8 and the shielding box are sleeved and fixed together or are in separation fit.
The box cover 1 is a stainless steel box cover made of stainless steel.
The box body 2 is a stainless steel box body made of stainless steel.
The base 3 is a stainless steel base made of stainless steel.
The fixing piece is a rubber sleeve.
The shielding box is a cuboid shielding box.
As shown in fig. 2, the notch 4 is rectangular in front view.
The through hole is circular in shape.
The utility model discloses the design of this application:
the accuracy of measuring the current transformer is improved by the aid of the box cover, the box body, the grounding wire and the like.
Description of the drawings:
1. principle of the technology
In order to reduce electromagnetic interference of the clamp type current sensor, a metal shielding box matched with the clamp type current sensor is developed, and the electromagnetic interference can be effectively resisted.
2. Application method
As shown in fig. 3, before the test, the clamp-type current sensor is packaged in a shielding box in advance, and the clamp-type current sensor is clamped on a CT end screen grounding wire to obtain the reference current. Meanwhile, the sensor is arranged in the shielding box, the shielding box cap is covered, the shielding box cap is fixed by using a rubber sleeve fixed on the outer side of the shielding box, and the shielding box is connected with the electric wire for grounding.
3. Comparison of tests
As shown in table 1, the accuracy of the wireless test method can be guaranteed by the wired test method.
Table 1:
technical contribution of the present application:
1. the clamp type current sensor is prevented from being subjected to electromagnetic interference, and the accuracy rate of the test result is high.
2. The device is small and portable, and the length dimension is 14cm, and the width dimension is 8 cm.
3. The design cost is low, and the shielding box of independent design closely cooperates with the clamp-on ammeter, does not have unnecessary design.
4. The electric shock risk caused by direct wiring of personnel is avoided.
5. The equipment risk that the end screen loses the grounding due to direct wiring of personnel is avoided.
Description of the application effects:
under the condition that the current transformer equipment is not powered off, a relative measurement method is adopted for carrying out live detection, and the current transformer is subjected to capacitance and dielectric loss factor test, so that insulation moisture, deterioration and deterioration of the transformer and penetrating and non-penetrating local defects of the transformer are reflected, and the running condition of the current transformer is judged.
The box cover and the box body cover are connected together in a buckling mode or are matched in a separating mode to form a shielding box used for shielding electromagnetic interference, and a detected wire channel used for penetrating through a detected wire of a detected cable and a detection wire channel used for penetrating through a detection cable on the clamp-on ammeter are arranged on the box body. According to the technical scheme, the accuracy of measuring the current transformer is improved through the box cover, the box body, the grounding wire and the like.
And secondly, a base is arranged at the bottom of the box body. This technical scheme improves the structural strength of box body, and it is more convenient to use, more firm.
And thirdly, the grounding wire comprises a grounding cable and a clamp, and the box body, the grounding cable and the clamp are sequentially and electrically connected. This technical scheme, the performance is more stable, and the sexual valence is better, and the structure is more reasonable.
Fourth, the ground cable is electrically connected to the bottom of the case. This technical scheme, the performance is more stable, and the structure is more reasonable.
Fifthly, the measured line channel is a notch which is positioned at the opening part of the box body and is communicated with the outside. This technical scheme, the performance is more stable, and the structure is more reasonable.
Sixthly, the detection line channel is a through hole which is positioned at the bottom of the box body and is communicated with the outside. This technical scheme, the performance is more stable, and the structure is more reasonable.
Seventhly, the shielding box also comprises a fixing piece which is arranged on the shielding box and used for fastening the box cover and the box body together. This technical scheme, it is more convenient to use, and is more firm, and the performance is more stable, and the structure is more reasonable.
Eighth, the fixing member is a fastening sleeve. The technical scheme has the advantages of convenient use and good cost performance.
Ninth, the fixing piece is a rubber sleeve. The technical scheme has the advantages of more convenient use and better cost performance.
Tenth, the fixing piece is a 8-shaped fixing piece, and includes a first ring sleeve and a second ring sleeve that are connected to each other, the first ring sleeve is sleeved on the ground wire, and the second ring sleeve and the shielding box are sleeved and fixed together or are in separation fit. This technical scheme, it is more convenient to use, and is more firm, and the performance is more stable, and the structure is more reasonable.
And (3) explanation of the popularization prospect:
the method can be widely applied to the charged detection of the insulation condition of capacitive equipment, such as: capacitive current transformers, capacitive voltage transformers, capacitive bushings, coupling capacitors, and the like.
Through the shielding protection to the clamp type current sensor, can make full use of the advantage that the clamp type current sensor does not work a telephone switchboard, fully ensure personal and equipment safety, improve work efficiency, the accuracy of the data that can effectively ensure.
The capacitive equipment electrification tester is used in the application and is used for electrification measurement of relative dielectric loss and capacitance of the capacitive equipment. Has the following functions:
1. and a high-precision pincerlike current sensor is adopted to detect the current. When the field live measurement is carried out, the ground wire does not need to be disconnected, a fixed sensor does not need to be additionally arranged, and the operation is very simple and convenient.
2. The reference can be made by current or PT secondary voltage.
3. The anti-interference capability is provided, in particular the anti-magnetic field interference capability is provided.
4. The instrument is powered by rechargeable battery and is equipped with large-screen LCD display and thermal printer. The instrument can store the measurement data and can transmit the data to the host.
Claims (10)
1. A shielding device for a clamp-on current sensor, comprising: including lid, box body and the earth connection of setting on the box body, the lid links together or the separation cooperation and forms the shielding box that is used for shielding electromagnetic interference with the box body lid, is provided with the test line passageway that is used for passing the test cable of being surveyed the cable and is used for passing the test cable on the clip-on ammeter on the box body.
2. The shielding device of claim 1, wherein: the bottom of the box body is provided with a base.
3. The shielding device of claim 1, wherein: the ground wire comprises a ground cable and a clamp, and the box body, the ground cable and the clamp are sequentially electrically connected.
4. A shielding device for a clamp-type current sensor according to claim 3, wherein: the grounding cable is electrically connected with the bottom of the box body.
5. The shielding device of claim 1, wherein: the tested line channel is a notch which is positioned at the opening part of the box body and is communicated with the outside.
6. The shielding device of claim 1, wherein: the detection line channel is a through hole which is positioned at the bottom of the box body and is communicated with the outside.
7. The shielding device of claim 1, wherein: the box cover further comprises a fixing piece arranged on the shielding box and used for fixing the box cover and the box body together.
8. The shielding device of claim 7, wherein: the fixing piece is a fastening sleeve.
9. The shielding device of claim 8, wherein: the fixing piece is a rubber sleeve.
10. The shielding device of claim 7, wherein: the fixing piece is an 8-shaped fixing piece and comprises a first ring sleeve and a second ring sleeve which are connected with each other, the first ring sleeve is sleeved on the grounding wire, and the second ring sleeve is sleeved and fixed with the shielding box together or is in separation fit with the shielding box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921321688.8U CN210432335U (en) | 2019-08-15 | 2019-08-15 | Shielding device suitable for clamp type current sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921321688.8U CN210432335U (en) | 2019-08-15 | 2019-08-15 | Shielding device suitable for clamp type current sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110402074A (en) * | 2019-08-15 | 2019-11-01 | 国家电网有限公司 | A kind of screening arrangement suitable for clamp current transducer |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110402074A (en) * | 2019-08-15 | 2019-11-01 | 国家电网有限公司 | A kind of screening arrangement suitable for clamp current transducer |
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