Withstand voltage test system

Abstract

The utility model relates to the technical field of safety performance detection, and discloses a withstand voltage test system, which comprises a first shell provided with a through hole; the lightning protection unit is arranged in the first shell, one end of the lightning protection unit is connected with the to-be-tested equipment, and the other end of the lightning protection unit penetrates through the through hole through a line to be grounded and is used for discharging abrupt change current or abrupt change voltage generated by the to-be-tested equipment; the abrupt current or the abrupt voltage is generated due to the fact that the to-be-tested device is interfered by the outside. According to the utility model, the voltage withstanding test can be carried out on a plurality of modules, and the modules do not need to be disassembled during the surge or voltage withstanding test.

Description

Technical Field

[0001] The utility model relates to the technical field of safety performance detection, in particular to a withstand voltage testing system. Background Art

[0002] Equipment undergoing voltage withstand tests usually has a surge protection circuit to prevent interference from the power supply or lightning. However, the components of the surge protection circuit are mostly varistors, whose operating voltage usually does not exceed the voltage withstand test value of the equipment, resulting in failure of the voltage withstand test during surge testing.

[0003] In related technologies, the device and surge protection circuit are packaged in a single module. A varistor is indirectly grounded inside the module via a grounding screw. The grounding screw is assembled during surge testing and removed during withstand voltage testing. However, this method only allows withstand voltage testing of a single module, and the module must be disassembled to install and remove the grounding screw during surge or withstand voltage testing. Utility Model Content

[0004] In view of this, the present invention provides a withstand voltage test system to solve the problem that the withstand voltage test can only be performed on a single module and the module needs to be disassembled.

[0005] In a first aspect, the present invention provides a withstand voltage test system, the withstand voltage test system comprising:

[0006] The first housing is provided with a through hole;

[0007] a lightning protection unit, disposed inside the first housing, one end of the lightning protection unit being connected to the device under test and the other end being grounded via a line passing through the through hole, for discharging a sudden current or sudden voltage generated by the device under test;

[0008] The sudden current or sudden voltage is generated due to external interference on the device under test.

[0009] In an optional embodiment, the withstand voltage test system further includes: a fixing component; one end of the fixing component is connected to the lightning protection unit, and the other end is grounded.

[0010] In an optional embodiment, the first shell is directly grounded; the other end of the fixing assembly is grounded through the first shell or directly grounded.

[0011] In an optional embodiment, the line is a cable, and the cable passes through the through hole; one end of the fixing component is connected to the lightning protection unit through the cable.

[0012] In an optional embodiment, the fixing assembly includes a grounding screw and an anchor bolt; mounting holes are provided on the lines at both ends of the fixing assembly, the anchor bolts are fixed in the mounting holes, and the grounding screw and the anchor bolt threads cooperate to tighten the grounding screw.

[0013] In an optional embodiment, the withstand voltage test system further includes: a second shell; the second shell is directly grounded and has the first shell and the lightning protection unit disposed therein.

[0014] In an optional embodiment, the lightning protection unit includes a first varistor, a second varistor and a third varistor; one end of the first varistor and one end of the second varistor are both connected to one end of the third varistor, the other end of the first varistor is connected to the positive pole of the input line of the device to be tested, the other end of the second varistor is connected to the negative pole of the input line of the device to be tested, and the other end of the third varistor is grounded through a through hole.

[0015] In an optional embodiment, an inspection hole is opened on the second shell, and the inspection hole corresponds to the installation hole.

[0016] In an optional embodiment, an inspection door is provided on the second shell, a glass window is installed on the inspection door, and both the inspection door and the glass window correspond to the fixed assembly.

[0017] In an optional embodiment, the second shell includes multiple first shells and multiple lightning protection units; the number of first shells and lightning protection units is the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural block diagram of a voltage withstand test system according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0021] Safety testing requirements require all electrical equipment to have electrical insulation capabilities. Hipot testing examines electrical equipment under high voltage to determine whether it breaks down and whether insulation distances between wiring and air are maintained.

[0022] At the same time, according to EMC requirements, equipment must also be able to cope with external interference. Therefore, surge protection circuits are required. External interference mainly includes two types: the first is power supply interference. In harsh industrial environments, equipment is connected to a power supply shared by many electrical devices. If a switching transient in a device causes a sudden change in current, it will interfere with other electrical devices from the power supply side. The second is lightning interference. When a lightning strike occurs, it will also cause lightning interference to the equipment, resulting in sudden voltage and current changes.

[0023] Surge protection circuits are divided into differential mode protection and common mode protection. Common mode protection is achieved by performing a surge test on the positive and negative input lines to the ground. The components of the surge protection circuit are mostly varistors. The operating voltage of this type of device usually does not exceed the withstand voltage test voltage value of the equipment, resulting in failure of the withstand voltage test during the surge test. In the related art, the equipment and the surge protection circuit are encapsulated in a module, and the varistor is indirectly grounded inside the module through a grounding screw. The grounding screw is assembled during the surge test and removed during the withstand voltage test. However, this method can only perform withstand voltage tests on a single module, and during surge or withstand voltage tests, the module needs to be disassembled to assemble and disassemble the grounding screw.

[0024] In order to solve the problem in the related art that only a single module can be subjected to a withstand voltage test and the module needs to be disassembled during surge or withstand voltage tests, an embodiment of the present utility model provides a withstand voltage test system, in which the lightning protection unit inside the first shell is grounded through a line passing through a through hole on the first shell, so that the line between the lightning protection unit and the grounding wire is exposed outside the first shell. During the withstand voltage test, it is only necessary to disconnect the line exposed outside the first shell, and keep the line exposed outside the first shell in a connected state during the surge test. There is no need to disassemble the first shell, and withstand voltage and surge tests can be performed on multiple devices at the same time. It is only necessary to control the on and off status of the line outside the first shell at the same time, which saves labor costs and improves the efficiency of the withstand voltage test.

[0025] The embodiment of the present invention provides a voltage withstand test system that can perform voltage withstand tests on electrical appliances, electrical equipment, electrical devices, electrical circuits, and electrical safety equipment. By simulating the insulation system of the equipment under test to be able to withstand a higher voltage for a certain period of time beyond normal operating conditions, the insulation capacity of the equipment is tested to see if it meets safety test requirements, thereby ensuring the personal safety of workers.

[0026] refer to Figure 1 , shows an example structural block diagram of a voltage withstand test system 100 provided in an embodiment of the present invention. Figure 1 The voltage withstand test system 100 shown in the figure is presented in the form of functional units, where the units refer to ASIC (Application Specific Integrated Circuit) circuits, processors and memories that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0027] exist Figure 1 Figure 1 shows a first housing 101 and a lightning protection unit 102 in a withstand voltage test system 100. A through-hole 1011 is provided on the first housing 101. The lightning protection unit 102 is disposed within the first housing 101. One end of the lightning protection unit 102 is connected to the device under test, and the other end is connected to ground via a line passing through the through-hole 1011. This is used to discharge sudden currents or sudden voltages generated by the device under test; sudden currents or sudden voltages are generated by external interference to the device under test.

[0028] It should be noted that the first housing 101 may be a packaging housing that packages the device under test and the lightning protection unit 102 , or may be a cabinet that directly mounts the device under test and the lightning protection unit 102 inside a cabinet.

[0029] A through hole 1011 is provided on the first shell 101, and the connection line between the lightning protection unit 102 and the grounding wire is led to the outside of the first shell 101, the purpose of which is to facilitate the connection or disconnection of the line outside the first shell 101. When performing a surge test, the line remains in a connected state, and the device under test is subjected to external interference, such as power supply interference or lightning interference, which will generate a sudden current or voltage. The lightning protection unit 102 introduces the sudden current or sudden voltage into the earth to discharge the sudden current or sudden voltage and complete the surge test. When performing a withstand voltage test, the line remains in a disconnected state, that is, the lightning protection unit 102 cannot work, and thus will not generate an operating voltage lower than the test voltage value. At this time, the test voltage is applied to the device under test, which can be unaffected by the lightning protection unit 102, thereby completing the withstand voltage test. The withstand voltage test system 100 provided by the embodiment of the present invention switches the mode between surge test and withstand voltage test by controlling the on-off state of the line outside the first shell, without disassembling the first shell 101. Furthermore, withstand voltage and surge tests can be performed on multiple devices simultaneously, and it is only necessary to control the on / off states of multiple lines outside the first housing 101 at the same time, thereby saving labor costs and improving the efficiency of the withstand voltage test.

[0030] In some optional implementations, the withstand voltage test system 100 further includes a fixing component 103 ; one end of the fixing component 103 is connected to the lightning protection unit 102 , and the other end is grounded.

[0031] It should be noted that the fixing assembly 103 can be a component that establishes an electrical connection between the electrical component and the ground. By assembling and disassembling the fixing assembly 103, the on / off state of the circuit can be switched. When the fixing assembly 103 is installed in the circuit, the circuit is in the connected state; when the fixing assembly 103 is removed, the circuit is in the disconnected state.

[0032] When performing a surge test, the fixed component 103 is assembled on the line, that is, the line remains in a connected state, and the device to be tested is subjected to external interference, generating a sudden current or a sudden voltage. The lightning protection unit 102 introduces the sudden current or sudden voltage into the earth to complete the surge test; when performing a withstand voltage test, the fixed component 103 is disassembled, that is, the line remains in a disconnected state, and at this time, a test voltage is applied to the device to be tested, thereby completing the withstand voltage test. Therefore, the withstand voltage test system 100 provided by the embodiment of the present invention controls the on-off state of the line by controlling the assembly and disassembly state of the fixed component 103, that is, controls the mode switching state of the surge test and the withstand voltage test, without the need to disassemble the first shell. In addition, withstand voltage and surge tests can be performed on multiple devices at the same time, and it is only necessary to control the assembly and disassembly states of multiple fixed components 103 at the same time, thereby saving labor costs and improving the efficiency of the withstand voltage test.

[0033] In some optional embodiments, the first shell 101 is directly grounded; the other end of the fixing assembly 103 is grounded through the first shell 101 or directly grounded.

[0034] It should be noted that to ensure personal safety and normal operation of equipment, the housing of electrical equipment (for example, module packaging housing, cabinet housing) needs to be grounded to prevent leakage.

[0035] In some optional embodiments, the line is a cable, and the cable passes through the through hole 1011; one end of the fixing component 103 is connected to the lightning protection unit 102 through the cable.

[0036] The wiring in the withstand voltage test system 100 provided in this embodiment of the utility model utilizes cables that are resistant to electromagnetic radiation and electrostatic interference, instead of conventional wires. Because at least a portion of the cables is exposed outside the first housing, when workers assemble and disassemble fixed components or disconnect and connect cables, the electrical equipment generates electromagnetic radiation, which can have a certain impact on human health and other electronic equipment. Therefore, the cables can drain electromagnetic radiation and static electricity to the ground, reducing damage and interference to the human body and other electronic equipment.

[0037] In some optional embodiments, the fixing component 103 includes a grounding screw 1031 and an anchor bolt 1032; mounting holes are provided on the lines at both ends of the fixing component 102, and the anchor bolt 1032 is fixed in the mounting hole, and the grounding screw and the anchor bolt threads cooperate to tighten the grounding screw.

[0038] The fixing assembly 103 in the withstand voltage test system 100 provided in this embodiment of the present invention utilizes a grounding screw and anchor bolt threadedly mated to connect the lightning protection unit 102 to the ground wire, ensuring that the device is not affected by the external environment, thereby maintaining stability and safety. Without the support of the grounding screw 1031, the device may shake due to external factors such as wind, rain, and vibration, or lose balance due to loosening of the anchor bolt 1032, potentially causing a safety accident.

[0039] In some optional embodiments, the withstand voltage test system 100 further includes: a second shell 104 ; the second shell 104 is directly grounded, and the first shell 101 and the lightning protection unit 102 are disposed therein.

[0040] In some optional embodiments, the second shell includes multiple first shells 101 and multiple lightning protection units 102; the number of first shells 101 and lightning protection units 102 is the same.

[0041] It should be noted that the second housing 101 can be a cabinet body that accommodates a single device under test, or it can be a cabinet body that accommodates multiple devices under test. Cabinets can include system cabinets, server cabinets, network cabinets, console cabinets, etc. One device under test corresponds to one first housing 101 and one lightning protection unit 102, and multiple devices under test correspond to multiple first housings 101 and multiple lightning protection units 102. The number of devices under test, first housings, and lightning protection units corresponds to the number of devices under test, first housings, and lightning protection units. Similarly, the number of through-holes 1011, fixing components 103, and cables also corresponds to the number of through-holes 1011, fixing components 103, and cables.

[0042] The second housing 104 is directly grounded for the same reason as the first housing 101 is directly grounded, which will not be further elaborated here.

[0043] In some optional embodiments, an inspection hole is opened on the second shell 104, and the inspection hole corresponds to the installation hole.

[0044] In some optional embodiments, an inspection door is provided on the second shell 104 , and a glass window is installed on the inspection door. Both the inspection door and the glass window correspond to the fixing assembly 103 .

[0045] In some optional embodiments, a cabinet door is provided on the second shell, and the cabinet door corresponds to the plurality of fixing components 103 .

[0046] In related technologies, in addition to encapsulating the equipment and surge protection circuit in a module, the module is also assembled into a system cabinet. At this time, the grounding screws inside the cabinet cannot be disassembled and assembled from the outside of the system cabinet. Since the varistor and the grounding wire inside the module are always connected, the surge protection circuit will always be in working state, and the voltage withstand test of the entire system cabinet will fail.

[0047] In order to solve the problem that the system cabinet cannot be subjected to a withstand voltage test outside the system cabinet, an embodiment of the present invention provides a withstand voltage test system 100. By opening an inspection hole on the second shell 104 and making the inspection hole correspond to the installation hole, the staff can use the installation tool to disassemble or assemble the grounding screw 1031 inside the second shell 104. When performing a surge test, the staff can use an installation tool such as a screwdriver to tighten the grounding screw 1031 and the anchor bolt 1031 through the inspection hole, that is, the circuit remains connected. The device under test is subjected to external interference, generating a sudden current or sudden voltage. The lightning protection unit 102 introduces the sudden current or sudden voltage into the ground, completing the surge test; when performing a withstand voltage test, the staff can use the installation tool to remove the grounding screw 1031 from the anchor bolt 1031 through the inspection hole, that is, the circuit remains disconnected. At this time, the test voltage is applied to the device under test, thereby completing the withstand voltage test. Therefore, the withstand voltage test system 100 provided by the present invention controls the assembly and disassembly status of the grounding screw 1031 through the access hole, thereby controlling the on / off status of the circuit, that is, controlling the mode switching between surge testing and withstand voltage testing, without disassembling the first housing 101. Furthermore, withstand voltage and surge testing can be performed on multiple devices simultaneously by simply controlling the assembly and disassembly status of multiple grounding screws 1031, saving labor costs and improving the efficiency of withstand voltage testing.

[0048] Alternatively, an inspection door is provided on the second shell 104, and a glass window is installed on the inspection door. Both the inspection door and the glass window correspond to the fixing component 103. The staff can check the connection status of the grounding screw 1031 and the anchor bolt 1032 through the glass window. If the grounding screw 1031 needs to be removed, the inspection door can be opened and the grounding screw 1031 corresponding to the inspection door inside the second shell 104 can be disassembled or assembled using the installation tool.

[0049] It should be noted that if the second housing 104 contains multiple devices under test, a corresponding number of inspection holes, inspection doors and glass windows can be provided to disassemble or assemble the grounding screws 1031 on each fixing assembly 103 respectively.

[0050] Alternatively, a cabinet door is provided on the second housing 104, and the cabinet door corresponds to the plurality of fixing components 103. When a cabinet is provided with a plurality of first housings 101 and a plurality of lightning protection units 102, a worker can open the cabinet door to view the plurality of fixing components 103 inside the second housing 104, and selectively remove and install the grounding screws 1031 on the equipment that needs to undergo a withstand voltage test. The withstand voltage test system 100 provided by the embodiment of the present invention can simultaneously perform withstand voltage and surge tests on multiple devices by simply controlling the assembly and disassembly states of the plurality of grounding screws 1031, thereby saving labor costs and improving the efficiency of the withstand voltage test.

[0051] In some optional embodiments, the lightning protection unit 102 includes a first varistor 1021, a second varistor 1022 and a third varistor 1023; one end of the first varistor 1021 and one end of the second varistor 1022 are both connected to one end of the third varistor 1023, the other end of the first varistor 1021 is connected to the positive pole of the input line of the device under test, the other end of the second varistor 1022 is connected to the negative pole of the input line of the device under test, and the other end of the third varistor 1023 is grounded through the through hole.

[0052] The surge protection circuit uses a three-varistor circuit design, in which the first varistor 1021 and the second varistor 1022 are connected in parallel. These two parallel varistors are then connected in series with the third varistor 1023 in the circuit. This design helps to disperse the current load and improve the stability and safety of the circuit. Specifically: First, the varistor acts as a voltage limiter in the circuit. When an overvoltage or surge occurs in the circuit, the varistor can respond quickly and limit the voltage to a lower level, thereby protecting the connected equipment from damage. Second, the two varistors used in parallel can increase the circuit's carrying capacity and prevent a single varistor from being damaged by excessive current. The parallel design also improves circuit reliability because even if one varistor fails, the other can still operate normally. Third, the two parallel varistors are connected in series in the circuit. This design further disperses the current load and ensures that the circuit remains stable in the face of large current surges. At the same time, the series design also helps control the current size, preventing excessive current from damaging the equipment.

[0053] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A withstand voltage test system, characterized in that: The withstand voltage test system comprises: The first shell is provided with a through hole; a lightning protection unit, disposed inside the first housing, one end of the lightning protection unit being connected to the device under test and the other end being grounded via a line passing through the through hole, for discharging a sudden current or sudden voltage generated by the device under test; The sudden current or sudden voltage is generated due to external interference on the device under test.

2. The system according to claim 1, wherein: The withstand voltage test system further includes: a fixing component; one end of the fixing component is connected to the lightning protection unit, and the other end is grounded.

3. The system according to claim 2, characterized in that The first shell is directly grounded; the other end of the fixing assembly is grounded through the first shell or directly grounded.

4. The system according to claim 2 or 3, characterized in that The circuit is a cable, and the cable passes through the through hole; one end of the fixing component is connected to the lightning protection unit through the cable.

5. The system according to claim 4, characterized in that The fixing assembly includes a grounding screw and an anchor bolt; mounting holes are provided on the lines at both ends of the fixing assembly, the anchor bolts are fixed in the mounting holes, and the grounding screw and the anchor bolt threads cooperate to tighten the grounding screw.

6. The system according to claim 5, characterized in that The withstand voltage test system further includes: a second shell; the second shell is directly grounded and has the first shell and the lightning protection unit arranged therein.

7. The system according to claim 1, wherein: The lightning protection unit includes a first varistor, a second varistor and a third varistor; one end of the first varistor and one end of the second varistor are both connected to one end of the third varistor, the other end of the first varistor is connected to the positive pole of the input line of the device under test, the other end of the second varistor is connected to the negative pole of the input line of the device under test, and the other end of the third varistor is grounded through the through hole.

8. The system according to claim 6, wherein: An inspection hole is provided on the second shell, and the inspection hole corresponds to the mounting hole.

9. The system according to claim 6, wherein: An inspection door is provided on the second shell, a glass window is installed on the inspection door, and both the inspection door and the glass window correspond to the fixing assembly.

10. The system according to claim 6, wherein: The second shell includes a plurality of the first shells and a plurality of the lightning protection units; the number of the first shells and the number of the lightning protection units are the same.

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