High-voltage cable withstand voltage detection device

Abstract

The utility model discloses a high-voltage cable withstand voltage detection device, which comprises a high-voltage power supply, a high-voltage cable, a fixed flange and a leakage current detection device, the output end of the high-voltage power supply is electrically connected with one end of the high-voltage cable; the other end of the high-voltage cable is electrically connected with a to-be-tested cable through the fixed flange; the fixed flange is grounded, and the leakage current detection device is electrically connected with the fixed flange electrically connected with the cable to be detected. By adopting the above technical scheme, the withstand voltage value of the to-be-detected cable can be rapidly and effectively detected so as to ensure that the high-voltage cable meets the use requirements of safety specifications, and the situation of abnormal high-voltage discharge caused by the to-be-detected cable is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of withstand voltage detection, in particular to a withstand voltage detection device for high-voltage cables. Background Art

[0002] Computed Tomography (CT) equipment can be used to examine a variety of diseases, among which the CT tube is an important component of the CT equipment.

[0003] The CT tube needs to be subjected to a high voltage of about 100 kV, which belongs to the ultra-high voltage range. If the voltage resistance of the connecting cable does not meet the standard, it may cause personal injury to the user and may also cause high voltage shock to other related equipment and damage the equipment. In addition, the CT tube may also have abnormal high voltage discharge during use, which may be caused by the CT tube or the high voltage cable connected to the CT tube.

[0004] Therefore, it is necessary to conduct a withstand voltage test on high-voltage cables to determine whether the cables used meet the safety specifications. Utility Model Content

[0005] The utility model provides a high-voltage cable withstand voltage detection device to ensure that the high-voltage cable meets the use requirements of safety specifications and eliminates the situation where the high-voltage cable causes abnormal high-voltage discharge.

[0006] According to the utility model, a high-voltage cable withstand voltage test device is provided, comprising: a high-voltage power supply, a high-voltage cable, a fixing flange and a leakage current detection device;

[0007] The output end of the high-voltage power supply is electrically connected to one end of the high-voltage cable; the other end of the high-voltage cable is connected to the cable to be tested through the fixing flange;

[0008] The fixing flange is grounded, and the leakage current detection device is electrically connected to the fixing flange electrically connected to the cable to be tested.

[0009] Optionally, the fixed flange includes a male flange and a female flange;

[0010] The high-voltage cable and the cable to be tested are cables of the same model, and both include an internal wire core, a shielding layer and an insulating layer;

[0011] The shielding layer of the high-voltage cable is in contact with and connected to the sub-port flange; the shielding layer of the cable to be tested is in contact with and connected to the female-port flange.

[0012] Optionally, it also includes: wire core wiring;

[0013] The fixed flange includes a first flange and a second flange;

[0014] The high-voltage cable is connected to the core connection through the first flange; the core connection is connected to the cable to be tested through the second flange; the high-voltage cable is electrically connected to the cable to be tested through the core connection.

[0015] Optionally, the shielding layer of the high-voltage cable is in contact with the sub-mouth flange of the first flange; the shielding layer at one end of the core wiring is in contact with the female flange of the first flange, and the shielding layer at the other end of the core wiring is in contact with the sub-mouth flange of the second flange; the shielding layer of the cable to be tested is in contact with the female flange of the second flange.

[0016] Optionally, it also includes: a protection inductor;

[0017] The first end of the protective inductor is electrically connected to the sub-mouth flange of the first flange and / or the female flange of the first flange; the second end of the protective inductor is electrically connected to the sub-mouth flange of the second flange and / or the female flange of the second flange.

[0018] Optionally, it further comprises: a first insulating oil tank and a second insulating oil tank;

[0019] The first insulating oil tank is used for placing the wire core connection; the second insulating oil tank is used for placing the cable to be tested.

[0020] Optionally, a withstand voltage detection device is also included;

[0021] The first input end of the withstand voltage detection device is electrically connected to the high voltage power supply; the second input end of the withstand voltage detection device is electrically connected to the leakage current detection device;

[0022] The withstand voltage detection device is used to output the withstand voltage detection result of the cable to be tested according to the detection result of the leakage current detection device and the working state of the high-voltage power supply; wherein the working state of the high-voltage power supply includes the set output voltage value and the actual output voltage value of the high-voltage power supply.

[0023] Optionally, the withstand voltage detection device further includes a first analog-to-digital conversion unit, a second analog-to-digital conversion unit and a logic processing unit;

[0024] The input end of the first analog-to-digital conversion unit is electrically connected to the high voltage power supply; the input end of the second analog-to-digital conversion unit is electrically connected to the leakage current detection device; the output end of the first analog-to-digital conversion unit and the output end of the second analog-to-digital conversion unit are electrically connected to the first input end and the second output end of the logic processing unit respectively;

[0025] The withstand voltage detection device is used to output the withstand voltage value of the cable to be tested according to the output result of the logic processing unit.

[0026] Optionally, the withstand voltage detection device further includes a timer;

[0027] The trigger end of the timer is electrically connected to the output end of the logic processing unit; the withstand voltage detection device is also used to output the withstand voltage time of the cable to be tested according to the timing result of the timer.

[0028] Optionally, the first analog-to-digital conversion unit includes a voltage comparator; and the second analog-to-digital conversion unit includes a current comparator.

[0029] The technical solution of the utility model, by providing a high-voltage power supply and a leakage current detection device, can enable the high-voltage power supply to provide a high-voltage electrical signal for testing to the cable to be tested. The leakage current detection device detects the leakage current outside the cable to be tested, and can quickly and effectively detect the withstand voltage value of the cable to be tested to ensure that the high-voltage cable meets the safety specification requirements; at the same time, it can also monitor the leakage current outside the cable to be tested and eliminate the situation where the cable to be tested causes abnormal high-voltage discharge.

[0030] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of a high-voltage cable withstand voltage test device provided by an embodiment of the utility model;

[0033] Figure 2 It is a structural schematic diagram of another high-voltage cable withstand voltage test device provided by an embodiment of the utility model;

[0034] Figure 3 It is a structural schematic diagram of another high-voltage cable withstand voltage test device provided by an embodiment of the utility model;

[0035] Figure 4 It is a structural schematic diagram of another high-voltage cable withstand voltage testing device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] Figure 1 This is a schematic diagram of a high voltage cable withstand voltage test device provided by the present utility model. Figure 1 The high-voltage cable withstand voltage test device includes a high-voltage power supply 10, a high-voltage cable 20, a fixing flange 30 and a leakage current detection device 40. The output end of the high-voltage power supply 10 is electrically connected to one end of the high-voltage cable 20, and the other end of the high-voltage cable 20 is connected to the cable to be tested 01 through the fixing flange 30. The fixing flange 30 is grounded, and the leakage current detection device 40 is electrically connected to the fixing flange 30 electrically connected to the cable to be tested 01.

[0039] Among them, the high-voltage power supply 10 is used to provide a stable high-voltage electrical signal for the high-voltage cable withstand voltage test device. The high-voltage cable 20 is a cable of the same model as the cable to be tested 01, and the high-voltage cable 20 is used to transmit the high-voltage electrical signal provided by the high-voltage power supply 10 to the cable to be tested 01. The high-voltage cable 20 and the cable to be tested 01 include an internal wire core, a shielding layer and an insulating layer from the inside to the outside (not shown in the figure).

[0040] The fixed flange 30 includes a sub-mouth flange 301 and a female-mouth flange 302, and both the sub-mouth flange 301 and the female-mouth flange 302 can include stainless steel materials. One end of the high-voltage cable 20 can be connected to the sub-mouth flange 301, and one end of the cable 01 to be tested can be connected to the female-mouth flange 302, or one end of the high-voltage cable 20 can be connected to the female-mouth flange 302, and one end of the cable 01 to be tested can be connected to the sub-mouth flange 301. The sub-mouth flange 301 and the female-mouth flange 302 can be connected and fixed together, so that the high-voltage cable 20 is electrically connected to the cable 01 to be tested. Among them, the sub-mouth flange 301 and the female-mouth flange 302 do not contact the internal wire core, and the sub-mouth flange 301 and the female-mouth flange 302 can be in contact with the shielding layer. During the process of testing the cable 01 to be tested by the high-voltage cable withstand voltage test device, the sub-mouth flange 301 and the mother-mouth flange 302 are fixed and connected together, the sub-mouth flange 301 and / or the mother-mouth flange 302 are grounded, and the shielding layer in contact with the sub-mouth flange 301 and / or the mother-mouth flange 302 is also grounded.

[0041] Exemplarily, during the process of the high-voltage cable withstand voltage test device testing the cable to be tested 01, the voltage value at the output end of the high-voltage power supply 10 can be gradually adjusted to a preset voltage value. If the cable to be tested 01 is abnormally discharged, there is charge on the shielding layer of the cable to be tested 01, and the charge can be transmitted to the ground through the fixing flange 30 to form a leakage current. Whether the cable to be tested 01 is abnormally discharged can be detected by the leakage current detection device 40. When the leakage current detected by the leakage current detection device 40 is zero, it means that the cable to be tested 01 is not abnormally discharged, and the withstand voltage value of the cable to be tested 01 meets the requirements; when the leakage current detected by the leakage current detection device 40 is greater than zero, it means that the cable to be tested 01 is abnormally discharged, and the withstand voltage value of the cable to be tested 01 does not meet the requirements.

[0042] In an optional embodiment, both ends of the cable to be tested 01 are connected to flanges, one end can be connected to a sub-flange 301, and the other end can be connected to a female flange 302. During the process of testing the cable to be tested 01 by a high-voltage cable withstand voltage test device, one end of the cable to be tested 01 can be fixed and connected to the high-voltage cable withstand voltage test device through the sub-flange 301 or the female flange 302 to receive a high-voltage electrical signal for testing, and the other end of the cable to be tested 01 can be floating, not grounded, and not connected to a load.

[0043] The high-voltage cable withstand voltage test device provided by the utility model can enable the high-voltage power supply to provide a high-voltage electrical signal for testing to the cable to be tested by arranging a high-voltage power supply and a leakage current detection device. The leakage current detection device detects the leakage current outside the cable to be tested, and can quickly and effectively detect the withstand voltage value of the cable to be tested to ensure that the high-voltage cable meets the safety specification requirements; at the same time, it can also monitor the leakage current outside the cable to be tested and eliminate the situation where the cable to be tested causes abnormal high-voltage discharge.

[0044] Optional, Figure 2 This is a schematic diagram of the structure of another high-voltage cable withstand voltage test device provided by the embodiment of the utility model, referring to Figure 2 The high-voltage cable withstand voltage test device also includes a core connection 50; the fixed flange 30 includes a first flange 310 and a second flange 320; the high-voltage cable 20 is connected to the core connection 50 through the first flange 310; the core connection 50 is connected to the cable to be tested 01 through the second flange 320; the high-voltage cable 20 is electrically connected to the cable to be tested 01 through the core connection 50.

[0045] The core connection 50 may also be a cable of the same type as the cable to be tested 01, used to connect the high-voltage cable 20 and the cable to be tested 01. At this time, the cable to be tested 01, the high-voltage cable 20 and the cable to be tested 01 may all include four-core cables.

[0046] In an optional embodiment, the shielding layer of the high-voltage cable 20 is in contact with and connected to the sub-mouth flange 301 of the first flange 310; the shielding layer at one end of the core connection 50 can be in contact with and connected to the female flange 302 of the first flange 310, and the shielding layer at the other end of the core connection 50 can be in contact with and connected to the sub-mouth flange 301 of the second flange 320; the shielding layer at one end of the cable 01 to be tested is in contact with and connected to the female flange 302 of the second flange 320. During the test of the cable 01 to be tested by the high-voltage cable withstand voltage test device, the sub-mouth flange 301 of the first flange 310 and the female flange 302 of the first flange 310 are fixed and connected together, the sub-mouth flange 301 of the second flange 320 and the female flange 302 of the second flange 320 are fixed and connected together, the sub-mouth flange 301 of the second flange 320 and / or the female flange 302 of the second flange 320 are grounded, and the shielding layer in contact with the sub-mouth flange 301 of the second flange 320 and / or the female flange 302 of the second flange 320 is also grounded.

[0047] In another optional embodiment, the high-voltage cable withstand voltage testing device also includes a protective inductor L; the first end of the protective inductor L is electrically connected to the sub-mouth flange 301 of the first flange 310 and / or the female flange 302 of the first flange 310; the second end of the protective inductor L is electrically connected to the sub-mouth flange 310 of the second flange 320 and / or the female flange of the second flange 302.

[0048] Exemplarily, the sub-flange 301 of the first flange 310 and / or the female flange 302 of the first flange 310 can be grounded through the protective inductor L to release the charge. When the cable 01 to be tested is abnormally discharged and there is a large amount of charge on the shielding layer of the cable 01 to be tested and the second flange 320, the protective inductor L can prevent a large amount of charge from flowing to the first flange 310, so that the charge can only flow to the ground through the second flange 320, which is beneficial for the leakage current detection device 40 to detect the leakage current.

[0049] In another optional embodiment, the high-voltage cable withstand voltage test device further includes a first insulating oil tank 61 and a second insulating oil tank 62; the first insulating oil tank 61 is used to place the core wiring 50; the second insulating oil tank 62 is used to place the cable to be tested 62. In this way, the core wiring 50 and the cable to be tested 62 can be insulated and protected to ensure the safety of electricity use.

[0050] Optional, Figure 3 This is a schematic diagram of the structure of another high-voltage cable withstand voltage test device provided by the embodiment of the utility model, referring to Figure 3 The high-voltage cable withstand voltage test device also includes a withstand voltage detection device 70; a first input terminal 701 of the withstand voltage detection device 70 is electrically connected to the high-voltage power supply 10; a second input terminal 702 of the withstand voltage detection device 70 is electrically connected to the leakage current detection device 40; the withstand voltage detection device 70 is used to output the withstand voltage detection result of the cable 01 to be tested according to the detection result of the leakage current detection device 40 and the working state of the high-voltage power supply 10; wherein the working state of the high-voltage power supply 10 includes the set output voltage value and the actual output voltage value of the high-voltage power supply 10.

[0051] Exemplarily, the withstand voltage detection device 70 can obtain the working status of the high-voltage power supply 10 and the detection result of the leakage current detection device 40. If the set output voltage value of the output end of the high-voltage power supply 10 is significantly different from the actual output voltage value, and / or the leakage current detected by the leakage current detection device 40 is greater than zero, it means that the cable 01 to be tested is abnormally discharged, the withstand voltage value is less than the set output voltage value, and the withstand voltage detection result output by the withstand voltage detection device 70 is that the withstand voltage is unqualified; if the set output voltage value of the output end of the high-voltage power supply 10 is the same as the actual output voltage value, and the leakage current detected by the leakage current detection device 40 is zero, it means that the cable 01 to be tested is not abnormally discharged, the withstand voltage value is greater than or equal to the set output voltage value, and the withstand voltage detection result output by the withstand voltage detection device 70 is that the withstand voltage is qualified.

[0052] Optional, Figure 4 This is a schematic diagram of the structure of another high-voltage cable withstand voltage test device provided by the embodiment of the utility model, referring to Figure 4 The withstand voltage detection device 70 also includes a first analog-to-digital conversion unit 710, a second analog-to-digital conversion unit 720 and a logic processing unit 730; an input end 711 of the first analog-to-digital conversion unit 710 is electrically connected to the high voltage power supply 10; an input end 721 of the second analog-to-digital conversion unit 720 is electrically connected to the leakage current detection device 40; an output end 712 of the first analog-to-digital conversion unit 710 and an output end 722 of the second analog-to-digital conversion unit 720 are electrically connected to a first input end 731 and a second output end 732 of the logic processing unit 730, respectively; the withstand voltage detection device 70 is used to output the withstand voltage value of the cable 01 to be tested according to the output result of the logic processing unit 730.

[0053] Exemplarily, the first analog-to-digital conversion unit 710 can obtain the voltage difference between the set output voltage value and the actual output voltage value of the output end of the high-voltage power supply 10, and compare the voltage difference with the voltage difference threshold. If the voltage difference is greater than the voltage difference threshold, it means that the cable 01 to be tested is abnormally discharged, and the first analog-to-digital conversion unit 710 can output a high-level signal representing "1"; otherwise, the first analog-to-digital conversion unit 710 can output a low-level signal representing "0". The second analog-to-digital conversion unit 720 can obtain the leakage current detected by the leakage current detection device 40, and compare the leakage current with the current threshold. If the leakage current is greater than the current threshold, it means that the cable 01 to be tested is abnormally discharged, and the second analog-to-digital conversion unit 720 can output a high-level signal representing "1"; otherwise, the second analog-to-digital conversion unit 720 can output a low-level signal representing "0". The logic processing unit 730 may include a logic gate capable of performing an "OR" logic operation. When the logic processing unit 730 receives one or two high-level signals indicating "1", it can output a high-level signal indicating "1", indicating that the cable 01 under test is abnormally discharged and the withstand voltage value is less than the set output voltage value; when the logic processing unit 730 receives two low-level signals indicating "0", it can output a low-level signal indicating "0", indicating that the cable 01 under test is not abnormally discharged and the withstand voltage value is greater than or equal to the set output voltage value.

[0054] In an optional implementation, the first analog-to-digital conversion unit 710 includes a voltage comparator; and the second analog-to-digital conversion unit 720 includes a current comparator.

[0055] Based on the above embodiments, continue to refer to Figure 4 The withstand voltage detection device 70 also includes a timer 740; a trigger end 741 of the timer 740 is electrically connected to an output end 733 of the logic processing unit 730; the withstand voltage detection device 70 is also used to output the withstand voltage time of the cable 01 to be tested according to the timing result of the timer 740.

[0056] Exemplarily, when the logic processing unit 730 outputs a low-level signal representing "0", the timer 740 can be triggered to start timing; when the logic processing unit 730 outputs a high-level signal representing "1", the timer 740 is triggered to stop timing and output the timing time, which is the withstand voltage time of the cable 01 to be tested under the currently set output voltage value.

[0057] In an optional embodiment, a timing upper limit value may be set in the timer 740. When the timer 740 reaches the timing upper limit value, the timer 740 stops timing and outputs the timing upper limit value, which may indicate that the withstand voltage time of the cable 01 to be tested at the currently set output voltage value is greater than or equal to the timing upper limit value, thus satisfying the withstand voltage time requirement for the cable 01 to be tested.

[0058] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A high voltage cable withstand voltage detection device, characterized in that: include: High voltage power supply, high voltage cable, fixing flange and leakage current detection device; The output end of the high-voltage power supply is electrically connected to one end of the high-voltage cable; the other end of the high-voltage cable is connected to the cable to be tested through the fixing flange; The fixing flange is grounded, and the leakage current detection device is electrically connected to the fixing flange electrically connected to the cable to be tested.

2. The high-voltage cable withstand voltage detection device according to claim 1, characterized in that: The fixed flange includes a male flange and a female flange; The high-voltage cable and the cable to be tested are cables of the same model, and both include an internal wire core, a shielding layer and an insulating layer; The shielding layer of the high-voltage cable is in contact with and connected to the sub-port flange; the shielding layer of the cable to be tested is in contact with and connected to the female-port flange.

3. The high voltage cable withstand voltage detection device according to claim 2, characterized in that: Also includes: Wire core wiring; The fixed flange includes a first flange and a second flange; The high-voltage cable is connected to the core connection through the first flange; the core connection is connected to the cable to be tested through the second flange; the high-voltage cable is electrically connected to the cable to be tested through the core connection.

4. The high-voltage cable withstand voltage detection device according to claim 3, characterized in that: The shielding layer of the high-voltage cable is in contact with the sub-mouth flange of the first flange; the shielding layer at one end of the core connection is in contact with the female flange of the first flange, and the shielding layer at the other end of the core connection is in contact with the sub-mouth flange of the second flange; the shielding layer of the cable to be tested is in contact with the female flange of the second flange.

5. The high-voltage cable withstand voltage detection device according to claim 4, characterized in that: Also includes: Protective inductor; The first end of the protective inductor is electrically connected to the sub-mouth flange of the first flange and / or the female flange of the first flange; the second end of the protective inductor is electrically connected to the sub-mouth flange of the second flange and / or the female flange of the second flange.

6. The high-voltage cable withstand voltage detection device according to claim 3, characterized in that: Also includes: a first insulating oil tank and a second insulating oil tank; The first insulating oil tank is used to place the wire core wiring; The second insulating oil tank is used for placing the cable to be tested.

7. The high voltage cable withstand voltage detection device according to claim 1, characterized in that: It also includes a withstand voltage detection device; The first input end of the withstand voltage detection device is electrically connected to the high voltage power supply; the second input end of the withstand voltage detection device is electrically connected to the leakage current detection device; The withstand voltage detection device is used to output the withstand voltage detection result of the cable to be tested according to the detection result of the leakage current detection device and the working state of the high-voltage power supply; wherein the working state of the high-voltage power supply includes the set output voltage value and the actual output voltage value of the high-voltage power supply.

8. The high voltage cable withstand voltage detection device according to claim 7, characterized in that: The withstand voltage detection device also includes a first analog-to-digital conversion unit, a second analog-to-digital conversion unit and a logic processing unit; The input end of the first analog-to-digital conversion unit is electrically connected to the high voltage power supply; the input end of the second analog-to-digital conversion unit is electrically connected to the leakage current detection device; the output end of the first analog-to-digital conversion unit and the output end of the second analog-to-digital conversion unit are electrically connected to the first input end and the second output end of the logic processing unit respectively; The withstand voltage detection device is used to output the withstand voltage value of the cable to be tested according to the output result of the logic processing unit.

9. The high voltage cable withstand voltage detection device according to claim 8, characterized in that: The withstand voltage detection device also includes a timer; The trigger end of the timer is electrically connected to the output end of the logic processing unit; the withstand voltage detection device is also used to output the withstand voltage time of the cable to be tested according to the timing result of the timer.

10. The high voltage cable withstand voltage detection device according to claim 8, characterized in that: The first analog-to-digital conversion unit includes a voltage comparator; the second analog-to-digital conversion unit includes a current comparator.

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