WO2013042155A2 - Capacitive sensor - Google Patents

Capacitive sensor Download PDF

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Publication number
WO2013042155A2
WO2013042155A2 PCT/IT2012/000286 IT2012000286W WO2013042155A2 WO 2013042155 A2 WO2013042155 A2 WO 2013042155A2 IT 2012000286 W IT2012000286 W IT 2012000286W WO 2013042155 A2 WO2013042155 A2 WO 2013042155A2
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WO
WIPO (PCT)
Prior art keywords
roll
foil
up
capacitive sensor
fact
Prior art date
Application number
PCT/IT2012/000286
Other languages
French (fr)
Other versions
WO2013042155A8 (en
WO2013042155A3 (en
Inventor
Alberto Bauer
Original Assignee
Alberto Bauer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US201161626050P priority Critical
Priority to US61/626,050 priority
Priority to US201161629116P priority
Priority to US61/629,116 priority
Application filed by Alberto Bauer filed Critical Alberto Bauer
Publication of WO2013042155A2 publication Critical patent/WO2013042155A2/en
Publication of WO2013042155A8 publication Critical patent/WO2013042155A8/en
Publication of WO2013042155A3 publication Critical patent/WO2013042155A3/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00 and G01R33/00 - G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/16Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08Measuring electromagnetic field characteristics
    • G01R29/0864Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0878Sensors; antennas; probes; detectors

Abstract

A capacitive sensor (100, 200, 300) for detecting an electric field generated by a live element (C, A1) has a roll-up band structure and said roll-up band structure comprises sensing means (10, 20, 30, 40, 50) able to sense the electric field generated by said live element (C, A1 ).

Description

T i t l e

Capacitive Sensor

* _ * _ * _ *

Technical Field

-The present invention relates to a capacitive sensor for detecting an electric field generated by a live conductor as, for example, generated by an insulated or non-insulated electric cables and/or generated by a feedthrough insulators for electric transformers and/or generated by similar elements and devices.

-More in particular, the present invention concerns a capacitive sensor of the above type able to detect the presence or no-presence of voltage, or able to detect the passage of an voltage transient, or able to value the voltage, in relationship with a first live conductor, without being affected by any surrounding electric fields, such as the electric fields generated by other conductors located nearby, with particular application to the technical field of detecting instruments and equipments for low, medium and high voltage lines and/or substations.

* * * *

Background of the invention

-At the present, the known capacitive sensors able to detect the electric field comprise a rigid case, in which said rigid case must be associated and/or fixed around and/or near the live conductor.

* * * *

Object of the invention

-The object of the present invention is to overcome the aforementioned drawbacks.

-The invention, which is defined in the claims, resolves the problem of creating a capacitive sensor for detecting an electric field generated by a live element, in which said capacitive sensor is characterized by the fact that it has a roll-up band structure and by the fact that said roll-up band structure comprises sensing means able to sense the electric field generated by said live element.

-Furthermore, the present invention is characterized by the fact that said roll-up band structure has a longitudinal dimension greater then the external perimeter of the wrapping path of the live element around which said roll-up band structure must be wrapped, by the fact that said sensing means comprise one or more foil elements, by the fact that said foil elements have a roll-up structure, by the fact that said elements are partially or totally overlapped among them, and by the fact that said roll-up band structure can assume a first configuration of non-use similar to a plain development and a second configuration of use similar to a wrap.

-Again this invention is characterized by the fact to comprise: >-a first foil element, positioned on the inside face of the roll-up band structure, in which said first foil element comprises a first roll-up foil of conductive material able to execute the function of a sensor of the electric field; >-a second foil element, positioned nearby the external surface of the first foil element, in which said second foil element comprises a second roll-up foil of insulating material able to execute the function of electric insulator; >-a third foil element, positioned nearby the external surface of the second foil element, in which said third foil element comprises a third roll-up foil of conductive material able to execute the function of a screen of electric filed.

* * * *

Brief Description of the Attached Figures

-Further purposes and advantages of the present invention shall become clearer from the following description, relative to preferred but not limiting example embodiments of the capacitive sensor, which is the object of the present invention, and from the attached drawings, in which:

>-Figure 1 is a schematic perspective exploded view of a first embodiment of the capacitive sensor which is the subject of the present invention in a plane configuration;

>-Figure 1A is a schematic cross-sectional view of the capacitive sensor of figure 1 wound around an insulated electric cable;

>-Figure 2 is a schematic perspective exploded view of a second embodiment of the capacitive sensor which is the subject of the present invention in a plane configuration;

>-F'igure 2A is a schematic cross-sectional view of the capacitive sensor of figure 2 wound around to an insulated electric cable;

>-Figure 3 is a schematic perspective exploded view of a third embodiment of the capacitive sensor which is the subject of the present invention in a plane configuration; >-Figure 3A is a schematic cross-sectional view of the capacitive sensor of figure 3 wound around to an insulated electric cable;

>-Figure 3B is a schematic cross-sectional view of the capacitive sensor of figure 3 wound around to a non-insulated core of an electric cable;

* * * *

Description Regarding the Three Embodiments

-With reference to the figures 1 , 2 and 3, they, respectively illustrate a capacitive sensor, 100, 200, 300, object of the present invention, able to detect the electric field generated by a live element as, for example, see figure 1A, the electric field generated by the core A of a cable C.

-Said capacitive sensor 100, 200, 300, substantially, has a roll-up band structure, preferably a monolithic roll-up band structure, in which said roll-up band structure forms and comprises sensing means 10-20-30-40-50, and, more in particular comprises and/or includes one or more elements 10, 20, 30, 40, 50, best described hereinafter, in which said elements are able to form a screened capacitive sensor.

-Furthermore, for the reasons that will result hereinafter, said capacitive sensor 100, 200, 300 has a longitudinal dimension L-100 greater than the external perimeter of the path of wrapping of the live element C around which said capacitive sensor would be wound and, preferably, the inner surface of said roll- up band structure may be adhesive, in order to facilitate the winding operations.

* * * *

First Embodiment

-With reference to the figure 1 it illustrates a first embodiment of a capacitive sensor 100, object of the present invention, able to detect the electric field generated by a live element as, for example, see figure 1A, the electric field generate by the core A of a cable C.

-Said capacitive sensor 100 has a roll-up band structure and it comprises one or more elements, 10, 20, 30, best described hereinafter, in which said elements 10, 20, 30 are able to form a screened capacitive sensor, in which each of said elements 0, 20, 30, have a foil configuration.

-More in particular, substantially, said capacitive sensor 100 has a structure similar to a roll-up band, with a longitudinal axes 100-Y, a longitudinal dimension L-100, a transversal axes 100-X, and a transversal dimension W-100.

-Said roll-up band structure, for the reasons that will result hereinafter, can assume a first extended non-use configuration, illustrated in figure 1 , and a second configuration, a wound use configuration, illustrated in figure 1A.

-With reference to the second wound configuration, the roll-up band structure has an inner side-surface and an outer side-surface, and, substantially, said capacitive sensor 100 comprises: >-a first foil element 10, positioned on the inner surface of the roll-up band structure, in which said first foil element 10 comprises a first roll-up foil 10 of conductive material able to execute the function of a sensor of electric field; >-a second foil element 20, positioned nearby the outer surface of the first foil element 10, in which said second foil element 20 comprises a second roll-up foil of insulating (dielectric) material able to execute the function of electric insulator; >-a third foil element 30, positioned nearby and/or against the outer surface of the second foil element 20, in which said third foil element 30 comprises a third roll-up foil of conductive material able to execute the function of a screen of electric field.

-According to a preferred embodiment said first roll-up foil 10, said second roll- up foil 20 and said third roll-up foil 30 are associate all together in order to form a roll-up band sandwich structure and, preferably, a monolithic band structure.

-With reference to figure 1 , said capacitive sensor 100 having roll-up band structure has a longitudinal dimension L-100 defining at its opposite longitudinal ends a first end 100-A of beginning wrapping and a second trailing end 100-B, in which said first roll-up foil 10 has a longitudinal dimension L-10 which is smaller than the longitudinal dimension L-100 of the capacitive sensor 100, in which, preferably, said first roll-up foil 10 is positioned in proximity of an initial portion P1 of said capacitive sensor 100 having a roll-up band structure.

-Furthermore, said first roll-up foil 10 has a transversal dimension W-10 smaller than the transversal dimension W-100 of the capacitive sensor 100 having roll-up band structure, as well as a transversal dimension W-10 smaller than the transversal dimension W-30 of the third roll-up foil 30 and, preferably, said first roll-up foil 10 is transversally positioned and centred with respect to the transversal dimension W-30 of the third roll-up foil 30.

-With reference to said third roll-up foil 30, preferably it comprises a metallic net of conductive material.

-With reference to said first roll-up foil 10, preferably it has the inner surface adhesive in order to facilitate the winding operations.

-Furthermore, the capacitive sensor 100 can comprise a first cable conductor 1 1 , having a first end connected with said first foil 10 and a second opposite end able to be connected with a secondary device, and a second cable conductor 31 , having first end connected with said third roll-up foil 30 and a second opposite end connected with the ground.

Use of the First Embodiment

-With reference to the capacitive sensor 100 above structurally described, it is particularly suitable for a rapid, easy and sure use by an operator.

-In fact, see figure 1 and 1A, said operator, with the capacitive sensor 100 in its first extended configuration, sets the end 100-A of beginning wrapping against the element C and, after that, said operator winds said capacitive sensor 100 around the element C.

-With reference to the figure 1A, the capacitive sensor 100 has been wound around a cable C having a live core A and a sheath G.

-In this figure 1A, there is illustrated a winding having a single turn but, in use, it is possible to perform a multi turns winding and, more in particular, a helical winding with multi turns.

-Again with reference to figure 1A, after the winding of the capacitive sensor 100, i.e. of the roll-up band structure, around the cable C, the first foil 10 is wound as a ring around the outer perimeter of the sheath G forming a first foil-ring- sleeve 10, the second foil 20 is wound as a ring around said first foil-ring-sleeve 10 forming a second foil-ring-sleeve 20, and the third foil 30 is wound as a ring around said second foil-ring-sleeve 20 forming a third foil-ring-sleeve 30, in which this last foil-ring-sleeve 30 is connected to ground through the cable 31.

-In this second wound configuration, the first foil-ring-sleeve 10 is able to detect the electric field generated by the live core A, and the signals regarding said detection will be transmitted along the cable 1 of connection to any devices.

-Again with reference to this second wound configuration, the third foil 30 configures a sleeve 30, in which said sleeve 30 has an axial dimension W-30 greater than the axial dimension W- 0 of the first foil 10, in which said foil-ring- sleeve 10 is axially centred with respect to the foil-ring-sleeve 30, in which said sleeve 30 is able screen said first foil-ring-sleeve 10 (that is the sensor 10 of electric field) against any surrounding electric fields, such as the electric fields generated by other conductors located nearby.

-In this context the first foil 10 can have a longitudinal dimension not able to form a complete ring-sleeve around the cable C and also in this case the capacitive sensor 100 will be able to detect the electric field produced by the live core A.

With reference to the above description the capacitive sensor 100 is able to detect the electric field generated by a single live conductor C without being affected by any surrounding electric fields, such as the electric fields generated by other conductors located nearby, with particular application to the technical field of detecting instruments and equipments for low, medium and high voltage lines and/or substations.

* . * . *

Second Embodiment - Further Foil 40

-With reference to the figure 2 it illustrates a second embodiment of a capacitive sensor 200 object of the present invention.

-This second embodiment comprises a first roll-up foil 10, a second roll-up foil 20 and a third roll-up foil 30, as in the first embodiment of Figure 1 and, furthermore, a fourth foil element 40, positioned above and/or along and/or against the outer surface of the third foil 30, in which said fourth foil roll-up element 40 is able to perform the function of coverage.

-Preferably, said fourth roll-up foil 40 is formed by insulating material (as for example rubber, silicon o similar materials) and, preferably, by adherent material. -As for the first embodiment, also in this second embodiment said first roll-up foil 10, said second roll-up foil 20, said third roll-up 30 and said fourth roll-up foil 40 are associated all together as a roll-up band sandwich.

Use of the Second Embodiment

-With reference to the capacitive sensor 200 above structurally described and with reference to Figure 2A, after the winding of the capacitive sensor 200, i.e. of the roll-up band structure, around the cable C, the first foil 10 forms a first foil- ring-sleeve 10, the second foil 20 form a second foil-ring-sleeve 20, and the third foil 30 form a third foil-ring-sleeve 30, as above described with reference to the fist embodiment, and, the fourth foil 40 forms a fourth foil-ring-sleeve 40, in which said fourth foil-ring-sleeve 40 is able to protect the first foil-ring-sleeve 10 and the other foil-ring-sleeve 20 and 30 by the atmospheric agents.

* _ * _ *

Third Embodiment - Further Foil 50

-With reference to the figure 3 it illustrates a third embodiment of a capacitive sensor 300 object of the present invention.

-This third embodiment comprises a first roll-up foil 10, a second roll-up foil 20, a third roll-up foil 30, and a fourth roll-up foil 40, as in the second embodiment of Figure 2 and, furthermore, a fifth foil element 50, positioned above and/or along and/or against the inner surface of the first foil 10, in which said fifth foil roll-up element 50 is preferably formed by insulating and/or dielectric material.

-Preferably, said fifth roll-up foil 50 is formed by an adherent material and, if desirable, its inner surface may be adhesive, in order to facilitate the winding operations.

-As for the first and second embodiments, also in this third embodiment said first roll-up foil 10, said second roll-up foil 20, said third roll-up 30, said fourth roll- up foil 40 and said fifth roll-up foil 50 are associated all together as a roll-up band sandwich.

Use of the Third form of Realization

-With reference to the capacitive sensor 300 above structurally described and with reference to Figure 3A, after the winding of the capacitive sensor 300, i.e. of the roll-up band structure, around the cable C, the fifth foil 50 forms an adherent ring-sleeve against the outer perimeter of the cable C, the first foil 10 forms first foil-ring-sleeve 10, the second foil 20 forms a second foil-ring-sleeve 20, the third foil 30 forms a third foil-ring-sleeve 30 and the fourth foil 40 forms a fourth foil- ring-sleeve 40 as above mentioned with reference to the second embodiment. -With reference to the capacitive sensor 300 above described and with reference to the figure 3A, after the wrapping of the said capacitive sensor 300 around the cable C the fifth foil 50 forms a foil-ring-sleeve 50 around and against the sheath G of the cable C and, as above mentioned with reference to the second embodiment, is formed a first foil-ring-sleeve 10 as a sensor of electric field, a second foil-ring-sleeve 20 insulating, a third foil-ring-sleeve 30 screening and a fourth foil-ring-sleeve 40 of coverage.

-With reference to the figure 3B, the capacitive sensor 300 can be directly wind on and against the naked core A1 and, in this case, the foil 50, formed by insulating and/ore dielectric material will be directly wound around and on said core A1.

* * *

Further Sensor of Magnetic Field 60

-With reference to the above described embodiments, said capacitive sensor 100, 200, 300, can further comprises a second sensor 60 of magnetic filed, as for example a magneto resistive sensor or a hall effect sensor.

-Said second magnetic field sensor 60 is positioned on the outer surface of said roll-up band structure and, more in particular, with reference to figure 1A on the third foil-ring-sleeve 30, with reference to figures 2A, 3A, 3B on the fourth foil-ring-sleeve 40, in which said second sensor 60 will be screened with respect to the electric field generated by the live conductor A (in figures 1A, 2A, 3A) and

A1 (in figure 3B) by the third foil-ring-sleeve 30.

* * *

-The above description of capacitive sensor for detecting an electric field is provided solely by way of not-limiting example, and clearly, therefore, said configuration can be modified or varied in any way suggested by experience and/or by its use or application within the scope of the following claims.

-The following claims consequently also form an integral part of the above description.

Claims

01) -Capacitive sensor for detecting an electric field generated by a live element
(C, A1 ), characterized by the fact said capacitive sensor (100, 200, 300) has a roll-up band structure and by the fact that said roll-up band structure comprises sensing means (10, 20, 30, 40, 50) able to sense the electric field generated by said live element (C, A1 ).
02) -Capacitive sensor according to the claim 1 , characterized for the fact that said roll-up band structure has a longitudinal (100-Y) dimension (L-100) greater than the external perimeter of the wrapping path of the live element (C, A1 ) around which said roll-up band structure must be wrapped.
03) -Capacitive sensor according to claim 1 or 2, characterized by the fact that said sensing means (10, 20, 30, 40, 50) comprise one or more foil elements (10, 20, 30, 40, 50) and by the fact that said foil elements (10, 20, 30, 40, 50) have a roll-up structure.
04) -Capacitive sensor according to one of the claim 1 to 3, characterized by the fact that said elements (10, 20, 30, 40, 50) are partially or totally overlapped among them.
05) -Capacitive sensor according to one of the claims from 1 to 4, characterized by the fact that said roll-up band structure can assume a first configuration of non-use similar to a plain development and a second configuration of use similar to a wrap.
06) -Capacitive sensor according to one of the claims from 1 to 5, characterized by the fact that the inner surface of said roll-up band structure is adhesive
07) -Capacitive sensor according to one of the claims from 1 to 6, characterized by the fact to comprise:
>-a first foil element (10), positioned on the inner surface of the roll-up band structure, in which said first foil element (10) comprises a first roll-up foil (10) of conductive material able to execute the function of sensor of electric field; >-a second foil element (20), positioned nearby the outer surface of the first foil element (10), in which said second foil element (20) comprises a second roll-up foil of insulating material able to execute the function of electric insulator;
>-a third foil element (30), positioned nearby the outer surface of the second foil element (20), in which said third foil element (30) comprises a third roll- up foil of conductive material able to execute the function of a screen of electric filed.
08) -Capacitive sensor according to claim 7, characterized by the fact that said first roll-up foil (10), said second roll-up foil (20) and said third roll-up foils (30) are associate together as a roll-up band sandwich.
09) -Capacitive sensor according to claim 7 or 8, characterized by the fact that said roll-up band structure has a determined longitudinal dimension (L-100) and by the fact that said first roll-up foil (10) has a longitudinal dimension (L-10) smaller than the longitudinal dimension (L-100) of the roll-up band structure.
10) -Capacitive sensor according to one of the claims from 7 to 9, characterized by the fact that said first roll-up foil (10) is positioned in proximity of an initial portion (P1) of said roll-up band structure.
11) -Capacitive sensor according to one of the claims from 7 to 10, characterized by the fact that said first roll-up foil (10) has a transversal dimension (W- 10) smaller than the transversal dimension (W-100) of the roll-up band structure.
12) -Capacitive sensor according to one of the claims from 7 to 1 1 , characterized by the fact that said first roll-up foil (10) has a transversal dimension (W- 10) smaller than the transversal dimension (W-30) of the third roll-up foil (30).
13) -Capacitive sensor according to one of the claims from 7 to 12, characterized by the fact that said first roll-up foil (10) is transversally positioned and 5 centred with respect to the transversal dimension (W-30) of the third roll-up foil (30).
14) -Capacitive sensor according to one of the claims from 7 to 13, characterized by the fact that said third roll-up foil (30) comprises a metallic net of 0 conductive material.
15) -Capacitive Sensor according to one of the claims from 7 to 14, characterized by the fact of further comprising a first cable conductor (11 ) having an end connected with said first foil (10) and a second opposite end able to be 5 connected with a secondary device.
16) -Capacitive sensor according to one of the claims from 7 to 15, characterized by the fact that the inner surface of said first foil element (10) is adhesive.
0 17)-Capacitive sensor according to one of the claims from 7 to 16, characterized by the fact of further comprising a second cable conductor (31) having an end connected with said third roll-up foil (30) and a second opposite end connected with the ground.
,5 18)-Capacitive sensor according to one of the preceding claims, characterized by the fact to further comprise:
>-a fourth foil element (40), positioned nearby the external surface of the third foil element (30), in which said fourth foil element (40) comprises a fourth roll-up foil able to execute the function of coverage.
0
19)-Capacitive sensor according to the claim 18, characterized by the fact that said fourth foil element (40) is formed by insulating material. 20) -Capacitive sensor according to the claim 18 or 19, characterized by the fact that said fourth roll-up foil element (40) if formed by adherent material.
21) -Capacitive sensor according to one of the claims from 18 to 20, characterized by the fact that said first roll-up foil (10), said second roll-up foil (20), said third roll-up foil (30) and fourth roll-up foil (40) are associated among them in the manner of a roll-up sandwich.
22) -Capacitive sensor according to one of the preceding claims, characterized by the fact to further comprise:
>-a fifth roll-up foil element (50), in which said fifth foil roll-up element (50) is able to form the most inner layer of said roll-up band structure, in which said fifth foil roll-up element (50) executes the function of support. 23)-Capacitive sensor according to the claim 22, characterized by the fact that said fifth roll-up foil (50) comprises a foil of insulating material.
24) -Capacitive sensor according to the claims 22 or 23, characterized by the fact that said fifth roll-up foil (50) is formed by adherent material.
25) -Capacitive sensor according to one of the claims from 22 to 24, characterized by the fact that said fifth roll-up foil (50) has the inner surface adhesive. 26)-Capacitive sensor according to one of the claims from 22 to 25, characterized by the fact that said first roll-up foil (10), said second roll-up foil (20), said third roll-up foil (30), said fourth roll-up foil (40) and said fifth roll-up foil (50) are associated together as a roll-up sandwich. 27)-Capacitive sensor according to one of the preceding claims, characterized by the fact that said capacitive sensor (100, 200, 300) has a longitudinal (100-Y) dimension (L-100) greater than the external perimeter of the body (C, A1) around which said capacitive sensor (100. 200, 300) will be wound with the purpose to execute a multi spiral wrap.
28) -Capacitive sensor according to one of the preceding claims, characterized bv the fact that when said capacitive sensor (100, 200, 300) is wrapped around the body (C, A1 ) the first roll-up foil (10) forms one or more rings- sleeves.
29) -Capacitive sensor according to one of the preceding claims, characterized bv the fact that when said capacitive sensor (100, 200, 300) is wrapped around the body (C, A1 ) the second roll-up foil (20) forms one or more rings- sleeves.
30) -Capacitive sensor according to one of the preceding claims, characterized bv the fact that when said capacitive sensor (100, 200, 300) is wrapped around the body (C, A1 ) the third roll-up foil (30) form one or more rings- sleeves.
31 ) -Capacitive sensor according to the claim 29, characterized by the fact that said one or more ring-sleeves execute an electric screening for the first foil- ring (10) with respect to the electric fields generated by other live conductors.
32) -Capacitive sensor according to one of the preceding claims, characterized bv the fact that of further comprising a sensor of magnetic filed (60) and by. the fact that said sensor of magnetic field is positioned on the outer surface (30 / 40) of said roll-up band structure.
PCT/IT2012/000286 2011-09-20 2012-09-14 Capacitive sensor WO2013042155A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US201161626050P true 2011-09-20 2011-09-20
US61/626,050 2011-09-20
US201161629116P true 2011-11-14 2011-11-14
US61/629,116 2011-11-14

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WO2013042155A8 WO2013042155A8 (en) 2013-05-16
WO2013042155A3 WO2013042155A3 (en) 2013-06-27

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WO2013042155A8 (en) 2013-05-16

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