Trolley short circuit tester

Abstract

The application discloses a trolley type short circuit tester, which comprises a trolley body and a short circuit testing system on the trolley body, wherein the short circuit testing system comprises N-phase connecting rows, U-phase connecting rows, V-phase connecting rows, W-phase connecting rows, a sliding connecting mechanism, a closing and opening circuit and a test result indicating lamp; the U-phase connecting rows, the V-phase connecting rows and the W-phase connecting rows are used for corresponding connection with a device to be tested or a circuit to be tested; a sliding groove is arranged on the trolley body; the sliding connecting mechanism is used for connecting two of the N-phase connecting rows, the U-phase connecting rows, the V-phase connecting rows and the W-phase connecting rows or simultaneously connecting the U-phase connecting rows, the V-phase connecting rows and the W-phase connecting rows by sliding along the sliding groove, so as to switch single-phase, two-phase or three-phase testing; and the closing and opening circuit is electrically connected with the U-phase connecting rows, the V-phase connecting rows and the W-phase connecting rows and is used for short-circuiting test phase lines of the device to be tested or the circuit to be tested. The application can freely switch among single-phase short circuit testing, two-phase short circuit testing and three-phase short circuit testing.

Description

Technical Field

[0001] This invention relates to the field of short-circuit testing technology, and more specifically, to a cart-type short-circuit tester. Background Technology

[0002] Currently, there is a lack of short-circuit testing equipment on the market, with virtually no options available. In particular, there is a complete lack of equipment for testing large-capacity three-phase short circuits. Moreover, most existing short-circuit testing instruments are temporary wiring assemblies, which are inconvenient to move and have poor safety, reliability, and operability. Furthermore, short-circuit equipment requires long-term manual wiring switching during single-phase and multi-phase short-circuit tests, which can easily lead to electric leakage and injury. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention innovatively provides a cart-type short-circuit tester that can freely switch between single-phase short-circuit testing, two-phase short-circuit testing, and three-phase short-circuit testing. The switching between testing methods is simple and highly versatile. The cart-type structure allows for free pushing and pulling by a single person, making it suitable for short-circuit protection testing of large quantities of power generation equipment and circuits in various situations.

[0004] To achieve the above-mentioned technical objectives, this invention discloses a cart-type short-circuit tester, including a cart body and a short-circuit testing system on the cart body.

[0005] The short-circuit test system includes an N-phase terminal block, a U-phase terminal block, a V-phase terminal block, a W-phase terminal block, a sliding connection mechanism, a closing and opening circuit, and a test result indicator light. The U-phase terminal block, V-phase terminal block, and W-phase terminal block are used to connect to the device or circuit under test. The trolley body is provided with a sliding groove. The sliding connection mechanism connects two or more of the N-phase terminal blocks, U-phase terminal blocks, V-phase terminal blocks, and W-phase terminal blocks simultaneously along the sliding groove, for switching between single-phase, two-phase, or three-phase testing. The closing and opening circuit is electrically connected to the U-phase terminal block, V-phase terminal block, and W-phase terminal block, for short-circuiting the test phase line of the device or circuit under test. The test result indicator light is used to indicate the short-circuit test result.

[0006] Furthermore, the closing and opening circuit includes a power supply, a contactor, an opening switch, and a closing switch. The contacts of the contactor are connected to the U-phase terminal block, the V-phase terminal block, and the W-phase terminal block. The closing switch is connected in parallel with the contactor and then in series with the opening switch and the power supply. The closing switch is used to control the closing of the contactor, and the opening switch is used to control the opening of the contactor.

[0007] Furthermore, the short-circuit test system also includes an operating power indicator light, which is connected in series with the power supply.

[0008] Furthermore, the sliding connection mechanism includes a slider that is engaged in the slide groove and can slide along the slide groove, three wire strip clamps, and a wire strip clamp opening and closing device. The three wire strip clamps are electrically connected to each other. The wire strip clamp opening and closing device is fixedly connected to the three wire strip clamps and is used to simultaneously control the opening and closing of the three wire strip clamps. The wire strip clamp opening and closing device is fixedly connected to the slider and moves with the slider, and is used to control the three wire strip clamps to selectively clamp two or simultaneously of the N-phase terminal block, U-phase terminal block, V-phase terminal block, and W-phase terminal block.

[0009] Furthermore, the wire clamp includes a first clamp body and a second clamp body that cooperate with each other, and the wire clamp opening and closing device includes a first control rod and a second control rod. The first control rod is fixedly connected to all the first clamp bodies, the second control rod is fixedly connected to all the second clamp bodies, the first control rod is fixedly connected to the slider, and the first control rod is sleeved on the outside of the second control rod and threadedly connected to the second control rod.

[0010] Furthermore, the N-phase terminal block, U-phase terminal block, V-phase terminal block, and W-phase terminal block are fixed in a row on the inner bottom wall of the trolley body. The slide groove is formed on the side wall of the trolley body. The slider can slide along the groove direction and can move in a direction perpendicular to the groove. The top of the trolley body is also provided with a first slide groove and a second slide groove. The groove direction of the first slide groove is parallel to the groove direction of the slide groove. The groove directions of the three second slide grooves are all perpendicular to the groove direction of the first slide groove and communicate with the first slide groove. There is a gap between the three second slide grooves. The first control rod and the second control rod slide in the first slide groove and the second slide groove and protrude above the first slide groove and the second slide groove. The first control rod and the second control rod clamp different terminal blocks by control cable clamps located in different second slide grooves.

[0011] Furthermore, the trolley body is equipped with an electrical warning light, which is connected in series with the power supply and is used to emit a warning light after the power supply is turned on.

[0012] Furthermore, the trolley body is embedded with a closing button and a closing button. The closing button is electrically connected to the closing switch and is used to control the opening and closing of the closing switch; the closing button is electrically connected to the closing switch and is used to control the opening and closing of the closing switch.

[0013] Furthermore, the test result indicator lights include a U-phase indicator light, a V-phase indicator light, and a W-phase indicator light. The U-phase indicator light is connected in series with the U-phase terminal block, the V-phase indicator light is connected in series with the V-phase terminal block, and the W-phase indicator light is connected in series with the W-phase terminal block.

[0014] The beneficial effects of this invention are as follows:

[0015] The trolley-type short-circuit tester of the present invention can freely switch between single-phase short-circuit testing, two-phase short-circuit testing and three-phase short-circuit testing. The switching between testing methods is simple and highly versatile. The trolley-type structure allows for free pushing and pulling by a single person, and is suitable for short-circuit protection testing of large quantities of power generation equipment and circuits in various occasions. Attached Figure Description

[0016] Figure 1 This is a front view of the cart-type short-circuit tester according to an embodiment of the present invention;

[0017] Figure 2 This is a front view of the sliding connection mechanism according to an embodiment of the present invention;

[0018] Figure 3 This is a side view of the sliding connection mechanism according to an embodiment of the present invention;

[0019] Figure 4 This is a top view of the cart-type short-circuit tester according to an embodiment of the present invention;

[0020] Figure 5 This is a right view of the cart-type short-circuit tester according to an embodiment of the present invention;

[0021] Figure 6 This is a circuit diagram of the closing and opening circuit of an embodiment of the present invention.

[0022] In the picture,

[0023] 1. Cart body; 11. Cart handle; 12. Cart main body; 121. Top plate; 122. Bottom plate; 123. Left side plate; 124. Right side plate; 125. Front side plate; 126. Rear side plate; 13. Wheel; 14. Slide groove; 15. First slide groove; 16. Second slide groove; 2. N-phase terminal block; 21. Insulator; 3. U-phase terminal block; 4. V-phase terminal block; 5. W-phase terminal block; 6. Sliding connection mechanism; 61. Slider; 62. Wire bar clamp; 621. First clamp; 622. Second clamp; 63. Wire bar Clamp opening and closing device; 631, First control lever; 632, Second control lever; 8, Test result indicator light; 81, U-phase indicator light; 82, V-phase indicator light; 83, W-phase indicator light; 9, Contactor; 10, Power outlet hole; 101, Plug; 20, Power cable reel; 201, Power cable reel bracket; 30, Operating power indicator light; 40, Live warning light; 50, Remote control box; 60, Closing button; 70, Opening button; 80, Remote control box cable reel; 801, Remote control box cable reel bracket; 90, Remote control box outlet hole. Detailed Implementation

[0024] The cart-type short-circuit tester provided by the present invention will be explained and described in detail below with reference to the accompanying drawings.

[0025] This embodiment specifically discloses a cart-type short-circuit tester, such as Figure 1 As shown, it includes a trolley body 1 and a short-circuit test system on the trolley body 1. The trolley body 1 is used to carry the short-circuit test system. The short-circuit test system can be moved to any position to be tested by pushing the trolley body 1. It can be moved freely by a single person and is suitable for short-circuit protection tests of a large number of power generation equipment and circuits in multiple occasions.

[0026] like Figure 1 As shown, the trolley body 1 includes a trolley handle 11, a trolley body 12, and wheels 13. The trolley body 12 is a three-dimensional rectangle, including a top plate 121, a bottom plate 122, a left side plate 123, a right side plate 124, a front side plate 125, and a rear side plate 126. The top plate 121, bottom plate 122, left side plate 123, right side plate 124, front side plate 125, and rear side plate 126 are fixedly connected to form a three-dimensional rectangle. The trolley handle 11 is welded to the left side plate 123. Wheels 13 are fixed at the four corners of the bottom of the bottom plate 122. The four wheels 13 are arranged in a rectangle. The wheels 13 are universal wheels with brakes. The short-circuit test system is set on the trolley body 12. By pushing the trolley handle 11, a single person can push the trolley body 1 to any position where a short-circuit test is required.

[0027] The short-circuit test system includes an N-phase terminal block 2, a U-phase terminal block 3, a V-phase terminal block 4, a W-phase terminal block 5, a sliding connection mechanism 6, a closing and opening circuit, and a test result indicator light 8. The U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5 are used to connect to the device or circuit under test. The trolley body 1 is provided with a sliding groove 14. The sliding connection mechanism 6 connects two or simultaneously to the N-phase terminal block 2, U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5 by sliding along the sliding groove 14, which is used to switch between single-phase, two-phase, or three-phase testing. The closing and opening circuit is electrically connected to the U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5, and is used to short-circuit the test phase line of the device or circuit under test. The test result indicator light 8 is used to indicate the short-circuit test result.

[0028] By sliding the sliding connection mechanism 6 along the slide groove 14, it is possible to switch between single-phase short-circuit test, two-phase short-circuit test and three-phase short-circuit test. The switching method is simple, and the three short-circuit tests are integrated into one, which is highly versatile, reduces the required equipment and saves costs.

[0029] In this embodiment, the N-phase terminal block 2, U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5 are all made of copper busbars. The N-phase terminal block 2 is fixed to the base plate 122, and an insulator 21 is fixed between the N-phase terminal block 2 and the base plate 122. The insulator 21 is bolted to the base plate 122, and the insulator 21 is bolted to the N-phase terminal block 2. The U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5 are also fixed to the base plate 122 of the trolley body 12.

[0030] like Figure 1 As shown, the sliding connection mechanism 6 includes a slider 61 that is engaged within the slide groove 14 and can slide along the slide groove 14, three wire bar clamps 62, and a wire bar clamp opening and closing device 63. The three wire bar clamps 62 are electrically connected to each other, and the wire bar clamp opening and closing device 63 is fixedly connected to the three wire bar clamps 62, used to simultaneously control the opening and closing of the three wire bar clamps 62. The wire bar clamp opening and closing device 63 is fixedly connected to the slider 61 and moves with the slider 61, used to control the three wire bar clamps 62 to select and clamp two or simultaneously of the N-phase terminal block 2, U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5. The slider 61 drives the wire bar clamp opening and closing device 63 to move to the vicinity of the terminal block to be clamped, selects the terminal block to be clamped, that is, selects to perform a single-phase short circuit test, a two-phase short circuit test, or a three-phase short circuit test, and then controls the wire bar clamps 62 to clamp the corresponding terminal block to achieve phase connection.

[0031] like Figure 1 , 2 As shown in Figure 3, the cable clip 62 includes a first clamping body 621 and a second clamping body 622 that cooperate with each other. The cable clip opening and closing device 63 includes a first control rod 631 and a second control rod 632. The first control rod 631 is fixedly connected to all the first clamping bodies 621, and the second control rod 632 is fixedly connected to all the second clamping bodies 622, as shown in Figure 3. Figure 2 and 3 As shown, the first control rod 631 is bolted to the middle first clamp 621, and the other two first clamps are integrated with the middle first clamp. The second control rod 632 is bolted to the middle second clamp 622, and the other two second clamps are integrated with the middle second clamp. The first control rod 631 is fixedly connected to the slider 61, and the first control rod 631 is sleeved on the outside of the second control rod 632 and threadedly connected to it. By rotating the second control rod 632, the second control rod 632 moves relative to the first control rod 631, thereby driving the second clamp 622 to move relative to the first clamp 621, realizing the opening and closing of the wire bar clamp 62. The operation is simple, and the wire bar clamp 62 is firmly fixed when clamping the wire bar.

[0032] like Figure 1As shown, the N-phase terminal block 2, U-phase terminal block 3, V-phase terminal block 4, and W-phase terminal block 5 are fixed in a row on the inner bottom wall of the trolley body 1. These terminal blocks are arranged along the length of the trolley body 12, forming a long row. Wiring holes are provided on the front side plate 125 of the trolley body 12. A sliding groove 14 is formed on the side wall of the trolley body 1. In this embodiment, the sliding groove 14 is formed on the front side plate, and its groove direction is parallel to the arrangement of the N-phase terminal blocks 2, U-phase terminal blocks 3, V-phase terminal blocks 4, and W-phase terminal blocks 5, located above and to the side of these terminal blocks. The slider 61 can slide along the groove of the slide 14 and move in a direction perpendicular to the slide 14. For example, the slider 61 can be a screw, with the screw head extending out of the slide 14 and the screw shank inside the slide 14, and able to slide along the slide 14. The screw head is larger than the width of the slide 14 and will not get stuck inside the slide 14. The screw shank can also move back and forth in a direction perpendicular to the slide 14. Figure 4 As shown, the top of the trolley body 1 is also provided with a first slide groove 15 and a second slide groove 16. That is, the first slide groove 15 and the second slide groove 16 are opened on the top plate 121 and penetrate the top plate 121. The groove direction of the first slide groove 15 is parallel to the groove direction of the slide groove 14. The groove directions of the three second slide grooves 16 are all perpendicular to the groove direction of the first slide groove 15 and are connected to the first slide groove 15. The three second slide grooves 16 are all located on the side of the first slide groove 15 near the front side plate 125. There is a gap between the three second slide grooves 16. The first control rod 631 and the second control rod 632 slide in the first slide groove 15 and the second slide groove 16 and protrude above the first slide groove 15 and the second slide groove 16. The first control rod 631 and the second control rod 632 clamp different wiring bars through the control cable clamps 62 located in different second slide grooves 16.

[0033] The three cable clips 62 are also arranged in a row, and their positions change as the first control lever 631 and the second control lever 632 slide. For example... Figure 4 As shown, when the first control lever 631 and the second control lever 632 are in the leftmost second slide groove 16, the middle wire strip clamp 62 of the three wire strip clamps 62 clamps the N-phase terminal block 2, and the rightmost wire strip clamp 62 clamps the U-phase terminal block 3, for single-phase short-circuit testing. When the first control lever 631 and the second control lever 632 are in the middle second slide groove 16, the three wire strip clamps 62 are connected to the U-phase terminal block 3, the V-phase terminal block 4, and the W-phase terminal block 5 respectively, for three-phase short-circuit testing. When the first control lever 631 and the second control lever 632 are in the rightmost second slide groove 16, the leftmost wire strip clamp 62 of the three wire strip clamps 62 clamps the V-phase terminal block 4, and the middle wire strip clamp 62 clamps the W-phase terminal block 5, for two-phase short-circuit testing.

[0034] In this embodiment, the process of the cable clamp opening and closing device 63 controlling the cable clamp 62 to clamp the terminal blocks is as follows: First, rotate the second control rod 632 clockwise, causing the second control rod 632 to move downward, thereby driving the second clamping body 622 to move downward. Since the slider 61 is engaged within the slide groove 14, the first control rod 631 and the first clamping body 621 provide some support, and the first clamping body 621 does not move in the vertical direction. This increases the distance between the second clamping body 622 and the first clamping body 621, and the cable clamp 62 is in the open state, opening the N-phase terminal block 2, U-phase terminal block 3, and V-phase terminal block 4. Phase 4 and W-phase 5 are at the same height. When clamping the terminals, the lower part of the first clamp 621 can be flush with the top of N-phase terminal 2, U-phase terminal 3, V-phase terminal 4 and W-phase terminal 5 and keep in contact. The top of the slider 61 can be a certain distance from the top of the slide groove 14. The first clamp 621 can be placed above the cable clamp 62 by lifting the first control lever and the second control lever. After the cable clamp 62 is opened, the top of the second clamp 622 is lower than the bottom of the cable clamp 62, so that the cable clamp 62 can be between the first clamp 621 and the second clamp 622. Then move the first control lever 631 and the second control lever 632, and slide them into the designated second slide groove 16. The first clamp 621 is above the terminal block and the second clamp 622 is below the terminal block. At this time, rotate the second control lever 632 in the opposite direction, so that the second control lever 632 carries the second clamp 622 up until the top of the second clamp 622 contacts the bottom of the terminal block, and the first clamp 621 and the second clamp 622 clamp the terminal block.

[0035] The first control lever 632 is covered with an insulating sleeve to provide insulation between it and the trolley body 12.

[0036] like Figure 6 As shown, the closing and opening circuit includes a power supply, contactor 9, an opening switch, and a closing switch. The power supply uses AC power, which is mains power in this embodiment. In this embodiment, as... Figure 1 and 4 As shown, a power outlet hole 10 is provided on the top plate 121 of the trolley body 12. A power cable reel 20 is fixed inside the top plate 121 of the trolley body 12. The power cable reel 20 is fixed on the power cable reel bracket 201. The power cable reel bracket 201 is bolted to the top plate 121. The power cable passes through the power outlet hole 10 from inside the trolley body 12 and exits outside the trolley body 12. The end of the power cable that exits outside the trolley body 12 is connected to a plug 101 for connecting to the mains power. The contacts of the contactor 9 are connected to the U-phase terminal block 3, the V-phase terminal block 4, and the W-phase terminal block 5. The contactor 9 is bolted to the base plate 122. The contactor 9 is an 800A contactor. The closing switch is connected in parallel with the contactor 9 and then in series with the opening switch and the power supply. The closing switch is used to control the closing of the contactor 9, and the opening switch is used to control the opening of the contactor 9.

[0037] like Figure 6 As shown, the short-circuit test system also includes an operation power indicator light 30, which is connected in series with the power supply. Figure 1 , 4 As shown in Figure 5, the operation power indicator 30 is embedded in the right side plate 124 of the trolley body 12. After connecting to the mains power, the operation power indicator 30 lights up.

[0038] like Figure 1 , 4 As shown in Figure 5, the trolley body 1 is equipped with a live warning light 40, which is connected in series with the power supply to emit a warning light after the power is turned on. The trolley-type short-circuit tester is live and has a test status warning function to prevent accidental activation by personnel.

[0039] like Figure 4 As shown, the trolley body 1 has a closing button 60 and a closing button 70 embedded in it. The closing button 60 and closing button 70 are fixed inside the remote control box 50. The closing button 60 is electrically connected to the closing switch and is used to control the opening and closing of the closing switch; the closing button 70 is electrically connected to the opening switch and is used to control the opening and closing of the opening switch. The remote control box cable reel 80 is fixed inside the trolley body 12 and is fixed to the remote control box cable reel bracket 801. The remote control box cable reel bracket 801 is bolted to the top plate 121. A remote control box cable outlet hole 90 is opened on the right side plate 124 of the trolley body 12. The remote control box 50 is fixed to the top plate 121 of the trolley body 12. The cable of the remote control box cable reel 80 passes through the remote control box cable outlet hole 90 and connects to the remote control box 50. The closing button 60 and closing button 70 are fixed to the top of the trolley body 12 for easy short-circuit testing.

[0040] like Figure 4 and 5 As shown, the test result indicator light 8 includes a U-phase indicator light 81, a V-phase indicator light 82, and a W-phase indicator light 83. The U-phase indicator light 81 is connected in series with the U-phase terminal block 3, the V-phase indicator light 82 is connected in series with the V-phase terminal block 4, and the W-phase indicator light 83 is connected in series with the W-phase terminal block 5. The arrangement order of the U-phase indicator lights 81, V-phase indicator lights 82, and W-phase indicator lights 83 is the same as that of the U-phase terminal blocks 3, V-phase terminal blocks 4, and W-phase terminal blocks 5. In this embodiment, the U-phase indicator lights 81, V-phase indicator lights 82, and W-phase indicator lights 83, along with the operating power indicator light 30, are all embedded in the right side plate 124.

[0041] The method for performing short-circuit testing with the cart-type short-circuit tester in this embodiment is as follows: When the cart-type short-circuit tester is in the ready state, the second control lever 632 is rotated clockwise to the bottom. Then, the first control lever 631 and the second control lever 632 slide along the first slide groove 15 and the second slide groove 16. The slider slides along the slide groove and moves in a direction perpendicular to the slide groove to adjust its position. It slides into a specific second slide groove 16 and is adjusted to the required test position for two-phase VW short circuit, three-phase, and single-phase NU. At this time, the bottom of the first clamp 621 is connected to the wire bar clamp. Contact the top of 62, then lift the second clamp 622 counterclockwise with the second control lever 632 to clamp and fix the wire bar clamp 62; further, pass the output terminal of the device under test or the circuit under test through the wiring hole and connect it to the wire bar clamp 62 on the input side of the contactor 9 with the corresponding wire number, and then connect the plug 101 to the mains power. At this time, the operation power indicator 30 lights up, and the magnetic control switch set on the operation power side closes at this time, so that the live warning light 40 on the top of the trolley body 12 lights up at the same time. The preparation work is completed and the working state is entered.

[0042] When in working condition, start the device under test to output voltage or power on the circuit under test. At this time, the test result indicator 8 corresponding to the short-circuited phase "U / V / W" on the trolley will light up. By operating the closing button 60 on the remote control box 50, the test phase line of the device under test or the circuit under test will be short-circuited momentarily. Observe the status of the device under test and whether the circuit under test has protection action. If the device under test and the circuit under test are activated, the corresponding test result indicator 8 of the short-circuited phase "U / V / W" on the trolley body 12 will turn off. Regardless of whether the device under test and the circuit under test are activated, the opening button 70 should be pressed in time to complete the test of the actual circuit or device.

[0043] This embodiment of the trolley-type short-circuit tester allows for free pushing and pulling by a single person, making it suitable for short-circuit protection testing of large quantities of power generation equipment in various situations. It allows for free switching between single-phase, two-phase, and three-phase short-circuit testing methods. It adds test status warning functions, wiring harness storage, and test method indication functions. Placing the short-circuit point inside the trolley improves the safety of the surrounding environment during testing. Through circuit and structural design, it achieves the goals of easy switching, free movement, protection warnings, and neat wiring storage under various test conditions, achieving a high level of reliability, applicability, convenience, and safety. This invention is simple and intuitive to operate, easy to move, convenient to use, and easy to maintain. Using a trolley reduces labor intensity and improves work efficiency, making it suitable for multi-location, large-volume product testing. It has a simple and reliable structure, reasonable layout, is compact and flexible, and has good maintainability. It is highly operable, allows for convenient switching between various operating conditions, and has complete indicating devices and adequate safety warning and protection measures.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any at least one embodiment or example. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and simple improvements made on the substantive content of the present invention should be included within the protection scope of the present invention.

Claims

1. A cart-type short-circuit tester, characterized in that, Includes the trolley body (1) and the short-circuit testing system on the trolley body (1), The short-circuit test system includes an N-phase terminal block (2), a U-phase terminal block (3), a V-phase terminal block (4), a W-phase terminal block (5), a sliding connection mechanism (6), a closing and opening circuit, and a test result indicator light (8). The U-phase terminal block (3), V-phase terminal block (4), and W-phase terminal block (5) are used to connect to the device or circuit under test. The trolley body (1) is provided with a sliding groove (14). The sliding connection mechanism (6) connects the N phases by sliding along the sliding groove (14). Two or more of the terminal blocks (2), U-phase terminal block (3), V-phase terminal block (4) and W-phase terminal block (5) are connected to the U-phase terminal block (3), V-phase terminal block (4) and W-phase terminal block (5) to switch between single-phase, two-phase or three-phase testing; the closing and opening circuit is electrically connected to the U-phase terminal block (3), V-phase terminal block (4) and W-phase terminal block (5) to short-circuit the test phase line of the device under test or the circuit under test; the test result indicator light (8) is used to indicate the short-circuit test result; The sliding connection mechanism (6) includes a slider (61) that is engaged in the slide groove (14) and can slide along the slide groove (14), three wire bar clamps (62) and a wire bar clamp opening and closing device (63). The three wire bar clamps (62) are electrically connected to each other. The wire bar clamp opening and closing device (63) is fixedly connected to the three wire bar clamps (62) and is used to control the opening and closing of the three wire bar clamps (62) simultaneously. The wire bar clamp opening and closing device (63) is fixedly connected to the slider (61) and moves with the slider (61) as it slides. It is used to control the three wire bar clamps (62) to select and clamp two or simultaneously clamp two of the N-phase terminal block (2), U-phase terminal block (3), V-phase terminal block (4) and W-phase terminal block (5). The wire clamp (62) includes a first clamp body (621) and a second clamp body (622) that cooperate with each other. The wire clamp opening and closing device (63) includes a first control rod (631) and a second control rod (632). The first control rod (631) is fixedly connected to all the first clamp bodies (621), and the second control rod (632) is fixedly connected to all the second clamp bodies (622). The first control rod (631) is fixedly connected to the slider (61). The first control rod (631) is sleeved on the second control rod (632) and threadedly connected to the second control rod (632).

2. The cart-type short-circuit tester according to claim 1, characterized in that, The closing and opening circuit includes a power supply, a contactor (9), an opening switch and a closing switch. The contacts of the contactor (9) are connected to the U-phase terminal block (3), the V-phase terminal block (4) and the W-phase terminal block (5). The closing switch is connected in parallel with the contactor (9) and then connected in series with the opening switch and the power supply. The closing switch is used to control the closing of the contactor (9), and the opening switch is used to control the opening of the contactor (9).

3. The cart-type short-circuit tester according to claim 2, characterized in that, The short-circuit test system also includes an operation power indicator (30), which is connected in series with the power supply.

4. The cart-type short-circuit tester according to claim 1, characterized in that, The N-phase terminal block (2), U-phase terminal block (3), V-phase terminal block (4), and W-phase terminal block (5) are fixed in a row on the inner bottom wall of the trolley body (1). The slide groove (14) is formed on the side wall of the trolley body (1). The slider (61) can slide along the groove direction of the slide groove (14) and can move in a direction perpendicular to the slide groove (14). The top of the trolley body (1) is also provided with a first slide groove (15) and a second slide groove (16). The groove direction of the first slide groove (15) is parallel to the groove direction of the slide groove (14). The three second slide grooves are also provided. The groove direction of the slide (16) is perpendicular to the groove direction of the first slide (15) and is connected to the first slide (15). There is a gap between the three second slides (16). The first control rod (631) and the second control rod (632) slide in the first slide (15) and the second slide (16) and protrude above the first slide (15) and the second slide (16). The first control rod (631) and the second control rod (632) clamp different terminal blocks by control cable clamps located in different second slides (16).

5. The cart-type short-circuit tester according to claim 2 or 3, characterized in that, The trolley body (1) is equipped with an electric warning light (40), which is connected in series with the power supply and is used to emit a warning light after the power supply is turned on.

6. The cart-type short-circuit tester according to claim 2 or 3, characterized in that, The trolley body (1) is equipped with a closing button (60) and a closing button (70). The closing button (60) is electrically connected to the closing switch and is used to control the opening and closing of the closing switch. The closing button (70) is electrically connected to the closing switch and is used to control the opening and closing of the closing switch.

7. The cart-type short-circuit tester according to claim 1 or 2, characterized in that, The test result indicator (8) includes a U-phase indicator (81), a V-phase indicator (82) and a W-phase indicator (83). The U-phase indicator (81) is connected in series with the U-phase terminal block (3), the V-phase indicator (82) is connected in series with the V-phase terminal block (4), and the W-phase indicator (83) is connected in series with the W-phase terminal block (5).

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