CN212433248U - Fault current detection device for low-voltage switch equipment and control equipment test - Google Patents
Fault current detection device for low-voltage switch equipment and control equipment test Download PDFInfo
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- CN212433248U CN212433248U CN202020792912.8U CN202020792912U CN212433248U CN 212433248 U CN212433248 U CN 212433248U CN 202020792912 U CN202020792912 U CN 202020792912U CN 212433248 U CN212433248 U CN 212433248U
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Abstract
The utility model provides a fault current detection device for testing low-voltage switch equipment and control equipment, which comprises an insulating plate, wherein at least two rows of connecting terminals penetrate through the insulating plate, one end of a first row of connecting terminals is connected with a busbar, and the other end is used for fixing one end of a fusing element; one end of the second column of connecting terminals is used for connecting a fault current limiting resistor, and the other end is used for fixing the other end of the fusing element; the fault current limiting resistor is provided with a marking device in a sliding mode and is connected to a corresponding fault current detection point through the marking device; the utility model discloses can realize multichannel fault current's detection, and can support the test under the not equidimension fault current.
Description
Technical Field
The utility model belongs to the technical field of the fault current detection, concretely relates to low-voltage switchgear and control device are experimental with fault current detection device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
National standard GB/T14048.1-2012 "part 1 of low-voltage switchgear and control apparatus: the basic performance requirements of various types of low-voltage switching and control devices (including but not limited to circuit breakers, low-voltage switches, disconnectors, fuse combinations, contactors, motor starters, terminal blocks, automatic transfer switching devices, etc.) are specified in detail in the general rules, which specify that fault currents are to be detected both in connection and disconnection capability tests and in short-circuit conditions.
The fault current detecting circuit consists of fusing element and fault current limiting resistor. The fusing element adopts a copper wire with a certain diameter and at least 50mm of length or an equivalent fusing body. The diameter of the fuse element is in one-to-one correspondence with the expected magnitude of the fault current, while limiting the fault current to a value that is at least later than the fuse element to blow when a 1500A current with a frequency between 45Hz and 67Hz is passed through the resistor, and limiting the fault current to within 1500(1 + -10%) A (or to within other classes of fault current magnitudes).
Typically, the low voltage switchgear and control device voltage ratings are most commonly two levels of 400V, 690V. Taking the rated voltage level of 400V as an example, the voltage applied to the fault detection circuit is 230V. When fault current 1500A is conducted, its fault detection circuit instantaneous power requirement will exceed 345kW, while its limiting fault current resistance is only 150m Ω or less in magnitude.
To the knowledge of the inventors, the high power resistors currently available on the market can only withstand about tens of watts, up to hundreds of watts, at a size of 150m Ω. Also the volume of the individual resistors is large and the higher the power requirement, the larger the volume and the more difficult it is to achieve a variable resistor size. To meet the test requirements, a large number of commonly used high power resistors must be used for complex series-parallel connections. This greatly limits the convenience of such resistors and further increases their cost. Moreover, at least 6 or more fault detection circuits are required for each test. Therefore, the conventional fault current limiting resistor made of a high-power resistor is extremely heavy, high in cost and difficult to adjust the size, so that the operability is extremely poor.
Disclosure of Invention
The utility model provides a solve above-mentioned problem, provide a low voltage switchgear and control device are experimental with fault current detection device, the utility model provides a restriction fault current resistor, under 1500A current, the fusing time is 2 cycles, only 1 half cycle later than the copper wire for the fuse element, can satisfy the requirement of the earlier fusing of fuse element, and fault current detection device can realize multichannel fault current's detection simultaneously, and can support the experiment under the not equidimension fault current.
According to some embodiments, the utility model adopts the following technical scheme:
a fault current detection device for testing low-voltage switch equipment and control equipment comprises an insulating plate, wherein at least two rows of connecting terminals penetrate through the insulating plate, one end of a first row of connecting terminals is connected with a busbar, and the other end of the first row of connecting terminals is used for fixing one end of a fusing element;
one end of the second column of connecting terminals is used for connecting a fault current limiting resistor, and the other end is used for fixing the other end of the fusing element;
and the fault current limiting resistor is provided with a marking device in a sliding manner and is connected to a corresponding fault current detection point through the marking device. The marking device is also used for conveniently adjusting and limiting the size of the fault current resistor.
As an alternative embodiment, the number of connection terminals in each row and the number of fault current limiting resistors are matched, and are not less than 6.
As an alternative embodiment, the scribing device is a scriber and comprises a movable body and a connecting line, wherein the movable body can slide and stop at any position on the fault current resistor for adjusting and limiting the size of the fault current resistor, and the movable body is provided with the connecting line which is connected with the corresponding fault current detection point.
As an alternative embodiment, the fault current detection point includes a plurality of points, one-to-one corresponding to the fault current limiting resistors.
As an alternative embodiment, the device further comprises a support, and the insulating plate is arranged on the support.
As an alternative embodiment, the fault current limiting resistor is arranged on the insulating plate by two fixed ends.
As an alternative embodiment, the fault current limiting resistor comprises four resistance wires, the resistance wires are spirally wound together around the same central line along the same direction, and the resistance wires are in close contact with each other, so that the resistor is integrally distributed in a straight line.
As an alternative embodiment, the resistance wire is made of alloy materials, and Cr30Ni70 alloy can be selected.
As an alternative embodiment, the wire diameter of the resistance wire is 0.8-1.0 mm.
As an alternative embodiment, the angle of inclination of the resistance wire to the centre line is 30-60 deg..
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses can realize multichannel fault current detection simultaneously, simple and practical, test efficiency is high.
The utility model provides a limit fault current resistor is the orthoscopic, and the inductance that brings is minimum.
The utility model provides a restriction fault current resistor is small, simple manufacture, low cost, through simple marking device, and realization resistance size that can be convenient is adjustable for support not the experiment under the big or small fault current of equidimension.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic diagram of the winding process of the fault current limiting resistor of the present invention;
fig. 2 is a schematic structural view of a surface a of the fault current detection device of the present invention;
fig. 3 is a schematic structural diagram of a side B of the fault current detection device of the present invention;
wherein: 1. busbar, 2, link A, 3, restriction fault current resistor, 4, marking device, 5, connecting wire, 6, link B, 7, support, 8, link C, 9, link D, 10, fuse element, 11, insulation board.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
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 in accordance with the invention. 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.
In the present invention, the terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only the terms determined for convenience of describing the structural relationship of each component or element of the present invention, and are not specific to any component or element of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The meaning of the above terms in the present invention can be determined according to specific situations by persons skilled in the art, and should not be construed as limiting the present invention.
As shown in fig. 2, the fault current detection device for the low-voltage switch device and the control device test comprises a support 7 and an insulating plate 11 arranged on the support, wherein a plurality of rows of test circuits and bus bars 1 are arranged on one surface of the insulating plate 11, the test circuits respectively comprise fault current limiting resistors 3, and two ends of each fault current limiting resistor 3 are respectively fixed on two connecting ends. The first end of the fault current limiting resistor 3 is wound or fixed on the connection terminal a2, and is connected to the busbar 1 through the fuse element 10. During testing, in each fault current detection loop, the connection end A2 of the fault current limiting resistor is connected to the busbar 1 through a lead. Then, the busbar 1 is connected to the test circuit neutral point or the artificial neutral point. And the simultaneous detection of multiple paths of fault currents in the test is realized.
The support 7 comprises a base and two support frames arranged on the base, and the two support frames are respectively positioned on two sides of the insulating plate 11.
The fault current limiting resistor 3 is provided with a scribing device 4 in a sliding manner, and the scribing device 4 is connected to a connection terminal B6, and a connection terminal B6 is connected to a corresponding fault current detection point.
As shown in fig. 1, the fault current limiting resistor, in this embodiment, is made of the following materials: the wire diameter of the Cr30Ni70 alloy is 0.90mm, the weight per meter is 0.005153kg/m, and the resistance per meter is 1.855 omega/m (at 20 ℃).
The winding mode of the fault current limiting resistor is that four resistance wires are simultaneously and tightly wound, and no large gap exists in the middle of the resistance wires.
The winding completed resistor is arranged linearly, so that inductive reactance generated by spiral arrangement is avoided, and the integral resistance value is larger than the pre-test measurement value.
As shown in fig. 3, a plurality of rows of connection terminal groups are arranged on the other surface of the insulating plate, each connection terminal group includes at least two fixed terminals (i.e., a connection terminal C8 and a connection terminal D9, where the connection terminal D9 is connected to a connection terminal a2 of a fixed point at one end of the fault current limiting resistor), a fuse element 10 is installed between the connection terminal C8 and the connection terminal D9, where the connection terminal C8 is connected to the busbar 1, and the connection terminal D9 is connected to the connection terminal a 2.
In this embodiment, the fuse element 10 is a copper wire, and fuse elements of different diameters can be replaced as required in each test.
The insulating plate 11 may be an epoxy insulating plate.
During the test, in each fault current detection loop, the current flowing route is as follows: the test sample fault current detection point comprises a test sample fault current detection point, a connecting end B6, a connecting lead 5, a scribing device 4, a fault current limiting resistor 3, a connecting end A2 (namely a connecting end D9), a fuse element 10, a connecting end C8, a busbar 1 and a test voltage neutral point or an artificial neutral point.
The fault detection device has the advantages that the resistor for limiting the fault current is small in size, simple to manufacture and low in cost, and the resistor can be adjusted conveniently through the simple marking device, so that tests under the fault currents of different sizes can be supported.
Because the resistor for limiting the fault current is small in size, the detection of the fault current of 6 paths or even more paths can be conveniently realized.
The resistance wire material used for manufacturing the fault current limiting resistor is generally used for manufacturing an electric furnace, is common and has low cost.
The fault current limiting resistor is in a straight line shape, and the inductance is minimum.
The resistor limits the fault current, under 1500A current, the fusing time is 2 cycles, and only 1 half cycle later than the copper wire for the fusing element just meets the requirement that the fusing element fuses firstly. The device is suitable for testing low-voltage switch equipment and control equipment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. A low-voltage switchgear and control device are experimental with fault current detection device, characterized by: the fuse element comprises an insulating plate, wherein at least two rows of connecting terminals penetrate through the insulating plate, one end of a first row of connecting terminals is connected with a bus bar, and the other end of the first row of connecting terminals is used for fixing one end of a fuse element;
one end of the second column of connecting terminals is used for connecting a fault current limiting resistor, and the other end is used for fixing the other end of the fusing element;
and the fault current limiting resistor is provided with a marking device in a sliding manner and is connected to a corresponding fault current detection point through the marking device.
2. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the number of each row of connecting terminals is matched with the number of the fault current limiting resistors, and is not less than 6.
3. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the scribing device is a scriber and comprises a moving body and a connecting line, wherein the moving body is capable of sliding and stopping at any position on the fault current resistor and is used for adjusting and limiting the size of the fault current resistor, the moving body is provided with the connecting line, and the connecting line is connected with the corresponding fault current detection point.
4. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the fault current detection points include a plurality of ones, one-to-one corresponding to the fault current limiting resistors.
5. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the insulation board is arranged on the support.
6. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the fault current limiting resistor is disposed on the insulating plate through two fixed ends.
7. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 1, wherein: the fault current limiting resistor comprises four resistance wires, the resistance wires are spirally wound together around the same central line along the same direction, and the resistance wires are in close contact with each other, so that the resistor is integrally distributed linearly.
8. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 7, wherein: the resistance wire is made of alloy materials;
or, Cr30Ni70 alloy.
9. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 7, wherein: the wire diameter of the resistance wire is 0.8-1.0 mm.
10. The fault current detection device for testing the low-voltage switch equipment and the control equipment as claimed in claim 7, wherein: the inclination angle of the resistance wire and the center line is 30-60 degrees.
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| CN202020792912.8U CN212433248U (en) | 2020-05-13 | 2020-05-13 | Fault current detection device for low-voltage switch equipment and control equipment test |
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| CN202020792912.8U CN212433248U (en) | 2020-05-13 | 2020-05-13 | Fault current detection device for low-voltage switch equipment and control equipment test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2616474A (en) * | 2022-03-11 | 2023-09-13 | Balfour Beatty Plc | Testing interface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2616474A (en) * | 2022-03-11 | 2023-09-13 | Balfour Beatty Plc | Testing interface |
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