A cable hydrolysis resistance testing system

Abstract

The present invention relates to the field of cable testing and detection technology, and in particular to a cable hydrolysis resistance test system, including a test box, a cover, an electrode, a power supply and a water supply pipe. The interior of the test box is hollow to form a cavity with an opening on the top surface, and the cavity is used to accommodate a test medium and a cable; the cover is detachably mounted on the top of the test box and closes the opening of the cavity, and the cover is provided with a first through hole for the cable to pass through and a second through hole for the electrode to pass through; the two poles of the power supply are respectively connected to the cable and the electrode; and the water supply pipe is connected to the cavity. The opening of the test box cavity is closed by assembling the cover with the test box, so that the test medium is in a relatively closed environment, which can reduce the evaporation of water in the test medium. At the same time, a water supply pipe is configured to replenish water into the test box cavity in time when the water in the test medium evaporates too much, so that the test medium maintains the required concentration.

Description

Technical Field

[0001] The invention relates to the technical field of cable testing and detection, and in particular to a cable hydrolysis resistance testing system. Background Art

[0002] Due to their special use environments, automotive cables, locomotive cables, photovoltaic cables, etc. are often required to meet the requirements of DC hydrolysis resistance. The international community has developed corresponding assessment methods for the hydrolysis resistance of cables. For example, the European standard EN50305:2002 "Test methods for flame-retardant cables for railway rolling stock" stipulates that the cable can withstand DC in salt water without breakdown; EN50618:2014 "Photovoltaic Cables" also have similar provisions. The International Organization for Standardization standard ISO 19642-2:2019 "Road Vehicles-Automotive Cables-Part 2: Test Methods" stipulates that the cable should withstand DC48V in 10g / L salt water. The insulation volume resistivity of the cable needs to be measured multiple times during the test. After all cycles are completed, the AC withstand voltage test is carried out. The test equipment is such as Figure 1 As shown: the top surface of the test box 01 is open, the internal cavity is filled with a test medium 200 (salt water), the electrode 02 is inserted into the salt water, the test sample cable 100 is placed in the salt water, and the two ends of the cable 100 are located above the water level of the salt water, and the two poles of the power supply 03 are respectively connected to one end of the cable 100 and the electrode 02. During the test, since the salt water needs to be kept at a high temperature and the water evaporates quickly, wax sealing is usually used to prevent the evaporation of water. However, since the wax belongs to a long-chain polyolefin, it will cause the insulation of the cable to swell, resulting in inaccurate test results. Since the test cycle exceeds 1 month, in the case of no wax sealing, water needs to be added frequently to ensure the concentration of the salt water, resulting in cumbersome operation. In addition, in order to keep the salt water at a high temperature, a heating tube needs to be used to heat the salt water, and the salt water will corrode the heating tube, so that the heating tube needs to be replaced frequently, which is wasteful and cumbersome to operate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a cable hydrolysis resistance testing system, which can reduce the evaporation of water in the test medium and maintain the concentration of the test medium, so as to overcome the above-mentioned defects of the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a cable hydrolysis resistance testing system, including a test box, a cover, electrodes, a power supply and a water supply pipe. The interior of the test box is hollow to form a cavity with an open top surface, and the cavity is used to accommodate the test medium and the cable; the cover is detachably mounted on the top of the test box and closes the opening of the cavity, and a first through hole for the cable to pass through and a second through hole for the electrode to pass through are provided on the cover; the two poles of the power supply are respectively connected to the cable and the electrode; and the water supply pipe is connected to the cavity.

[0005] Preferably, a liquid level sensor for detecting the liquid level of the test medium in the cavity is provided on the test box, a valve is provided on the water supply pipe, and the liquid level sensor is connected to the valve.

[0006] Preferably, the liquid level sensor comprises an upper limit sensor arranged at the highest liquid level of the test medium in the cavity and a lower limit sensor arranged at the lowest liquid level of the test medium in the cavity.

[0007] Preferably, the valve comprises a solenoid valve installed on the water supply pipe and a solenoid valve controller for controlling the opening or closing of the solenoid valve, and the liquid level sensor is connected to the solenoid valve controller.

[0008] Preferably, a shielding sheet capable of covering or opening the first through hole is provided on the cover at the first through hole.

[0009] Preferably, the cover is provided with a fixing piece for fixing the cable.

[0010] Preferably, a heating chamber independent of the cavity is formed inside the test box, the heating chamber and the cavity are separated by a heat conducting plate, and a heating device is provided in the heating chamber.

[0011] Preferably, the heating device comprises a heating medium and a heating tube contained in the heating chamber.

[0012] Preferably, a temperature sensor for detecting the temperature of the test medium in the cavity is provided in the cavity, the heating tube is connected to a temperature controller, and the temperature sensor is connected to the temperature controller.

[0013] Preferably, one pole of the power supply is provided with a first lead wire for connecting to the electrode, and the other pole is provided with a plurality of second lead wires connected in parallel for connecting to the cable.

[0014] Compared with the prior art, the present invention has significant improvements:

[0015] The cable hydrolysis resistance testing system of the present invention uses a cover to assemble with the test box to seal the opening of the test box cavity, so that the test medium is in a relatively closed environment, which can reduce the evaporation of water in the test medium. At the same time, a water replenishment pipe is configured to replenish water into the test box cavity in time when the water in the test medium evaporates too much, so that the test medium maintains the required concentration. The system has the advantages of simple operation, no damage to the cable, and ensuring accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a test device for testing the hydrolysis resistance of cables in the prior art.

[0017] Figure 2 It is a structural schematic diagram of a cable hydrolysis resistance testing system according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the first through hole on the cover in the cable hydrolysis resistance testing system according to an embodiment of the present invention.

[0019] The reference numerals are described as follows:

[0020] 100, cable 200, test medium

[0021] 01. Test box 02. Electrode 03. Power supply

[0022] 1. Test chamber 1a, cavity 1b, heating chamber

[0023] 2. Cover 21, first through hole 22, second through hole

[0024] 3. Electrode 4, power supply 41, first lead wire

[0025] 42, second lead wire 5, water supply pipe 6, upper limit sensor

[0026] 7. Lower limit sensor 8. Solenoid valve 9. Solenoid valve controller

[0027] 10. Shielding sheet 11. Fixing piece 12. Heat conducting plate

[0028] 13. Heating medium 14. Heating tube 15. Temperature sensor

[0029] 16. Temperature controller 17. Stirring paddle DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0034] like Figure 2 and Figure 3 FIG. 1 is a diagram showing an embodiment of a cable hydrolysis resistance testing system according to the present invention.

[0035] See also Figure 2 The cable hydrolysis resistance test system of this embodiment includes a test box 1, a cover 2, an electrode 3, a power supply 4 and a water supply pipe 5. The interior of the test box 1 is hollow to form a cavity 1a with an opening on the top surface. The cavity 1a is used to accommodate a test medium 200 and a cable 100. The test medium 200 is salt water (sodium chloride solution), and the cable 100 is a prepared cable sample to be tested. The cover 2 is detachably mounted on the top of the test box 1 and closes the opening of the cavity 1a. The opening of the cavity 1a of the test box 1 can be closed or opened by assembling or disassembling the cover 2 and the test box 1. The cover 2 is provided with a first through hole 21 for the cable 100 to pass through and a second through hole 22 for the electrode 3 to pass through. There are at least two first through holes 21. When the cover 2 closes the opening of the cavity 1a of the test box 1, the two ends of the cable 100 placed in the cavity 1a of the test box 1 can pass through the two first through holes 21 respectively and extend out of the cover 2, and the electrode 3 passes through the second through hole 22 and is inserted into the test medium 200 in the cavity 1a of the test box 1. The two poles of the power supply 4 are respectively connected to one end of the cable 100 extending out of the cover 2 and the end of the electrode 3 located outside the cover 2, thereby forming a detection circuit. One end of the water supply pipe 5 is connected to an external water source, and the other end of the water supply pipe 5 is connected to the cavity 1a of the test box 1. The water supply pipe 5 can be installed on the side wall of the test box 1, and the water supply pipe 5 is used to replenish water into the cavity 1a of the test box 1.

[0036] The cable hydrolysis resistance testing system of the present embodiment adopts a cover 2 assembled with the test box 1 to seal the opening of the cavity 1a of the test box 1, so that the test medium 200 is in a relatively closed environment, which can reduce the evaporation of water in the test medium 200. At the same time, a water replenishment pipe 5 is configured to replenish water into the cavity 1a of the test box 1 in time when the water in the test medium 200 evaporates too much, so that the test medium 200 maintains the required concentration. It has the advantages of simple operation, no damage to the cable 100, and ensuring accurate test results.

[0037] In this embodiment, preferably, a liquid level sensor is provided on the test box 1, and the liquid level sensor is used to detect the liquid level of the test medium 200 in the cavity 1a. A valve is provided on the water supply pipe 5, and the valve is used to control the opening or closing of the water supply pipe 5. The liquid level sensor feeds back the liquid level information of the test medium 200 in the cavity 1a detected by the liquid level sensor to the valve, and the valve controls the opening or closing of the water supply pipe 5 according to the received liquid level information, so that the water supply pipe 5 starts or stops replenishing the input water into the cavity 1a of the test box 1, thereby realizing automatic liquid replenishment.

[0038] In a preferred embodiment, the liquid level sensor may include an upper limit sensor 6 provided at the highest liquid level of the test medium 200 in the cavity 1a and a lower limit sensor 7 provided at the lowest liquid level of the test medium 200 in the cavity 1a. The valve may include a solenoid valve 8 installed on the water supply pipe 5 and a solenoid valve controller 9 for controlling the opening or closing of the solenoid valve 8, and the upper limit sensor 6 and the lower limit sensor 7 are both connected to the solenoid valve controller 9. The highest liquid level of the test medium 200 in the cavity 1a and the lowest liquid level of the test medium 200 in the cavity 1a are the liquid level range of the test medium 200 in the cavity 1a set according to the concentration range of the test medium 200 that meets the test requirements. During the test, when the liquid level of the test medium 200 in the cavity 1a is between the highest liquid level of the test medium 200 in the cavity 1a and the lowest liquid level of the test medium 200 in the cavity 1a, that is, between the upper limit sensor 6 and the lower limit sensor 7, the concentration of the test medium 200 meets the requirements and no liquid replenishment is required. At this time, the solenoid valve controller 9 controls the solenoid valve 8 to close and the water replenishment pipe 5 to close. As the test proceeds, moisture in the test medium 200 evaporates. When the liquid level of the test medium 200 in the cavity 1a drops to the lower limit sensor 7, the lower limit sensor 7 detects the liquid level information and feeds it back to the solenoid valve controller 9. The solenoid valve controller 9 controls the solenoid valve 8 to open according to the liquid level information detected by the lower limit sensor 7, so that the water supply pipe 5 is opened, and water begins to be replenished into the cavity 1a of the test box 1. Until the liquid level of the test medium 200 in the cavity 1a rises to the upper limit sensor 6, the upper limit sensor 6 detects the liquid level information and feeds it back to the solenoid valve controller 9. The solenoid valve controller 9 controls the solenoid valve 8 to close according to the liquid level information detected by the upper limit sensor 6, so that the water supply pipe 5 is closed, and water is stopped from being replenished into the cavity 1a of the test box 1.

[0039] In this embodiment, preferably, a shielding sheet 10 is provided on the cover 2 at the first through hole 21, and the shielding sheet 10 can cover or open the first through hole 21. When the shielding sheet 10 opens the first through hole 21, the cable 100 can pass through the first through hole 21. When the shielding sheet 10 covers the first through hole 21, the sealing effect can be increased, and the evaporation of water in the test medium 200 in the cavity 1a can be minimized. Figure 3Preferably, the shielding sheet 10 is rotatably mounted on the upper surface of the cover 2 at the outer edge of the first through hole 21, and the first through hole 21 can be covered or opened by rotating the shielding sheet 10. In this embodiment, one or more shielding sheets 10 are provided at each first through hole 21 on the cover 2.

[0040] In this embodiment, preferably, the cover 2 is provided with a fixing member 11 for fixing the cable 100, and the end of the cable 100 extending from the first through hole 21 on the cover 2 can be connected to the fixing member 11 to prevent the end of the cable 100 from falling from the first through hole 21 into the test medium 200 in the cavity 1a. Figure 3 Preferably, the fixing member 11 is fixed to the upper surface of the cover 2 at the outer edge of the first through hole 21. The fixing member 11 may be a fixing column or a fixing clip.

[0041] See also Figure 2 In this embodiment, preferably, a heating chamber 1b is formed inside the test box 1, which is independent of the cavity 1a. The heating chamber 1b is separated from the cavity 1a by a heat conducting plate 12, and the heat conducting plate 12 has a heat conducting function. A heating device is provided inside the heating chamber 1b. Through the heat conducting effect of the heat conducting plate 12, the heat generated by the heating device in the heating chamber 1b can be transferred to the cavity 1a through the heat conducting plate 12, thereby heating the test medium 200 in the cavity 1a, so that the test medium 200 maintains the required temperature. Therefore, the heating device does not directly heat the test medium 200, but transfers heat to the test medium 200 through the heat conducting plate 12, so that the test medium 200 will not corrode the heating device, thereby avoiding frequent replacement of the heating device due to corrosion damage. In addition, the heating device is arranged inside the test box 1, which can ensure the lightness of the overall structure and the ease of operation of the cable hydrolysis resistance test system. The heating chamber 1b can be located at the bottom or around the cavity 1a. Preferably, the surface of the heat conducting plate 12 facing the cavity 1 a is provided with a salt water corrosion resistant coating to prevent the heat conducting plate 12 from being corroded by the test medium 200 .

[0042] In this embodiment, preferably, the heating device includes a heating medium 13 and a heating tube 14 contained in the heating chamber 1b. The heating medium 13 is a heat-conducting liquid, such as silicone oil, preferably heat-conducting silicone oil. The heating tube 14 heats the heating medium 13 to increase the temperature of the heating medium 13, and the heat of the heating medium 13 is transferred to the cavity 1a through the heat conducting plate 12 to heat the test medium 200 in the cavity 1a.

[0043] Further, in this embodiment, a temperature sensor 15 is provided in the cavity 1a, and the temperature sensor 15 is placed in the test medium 200. The temperature sensor 15 is used to detect the temperature of the test medium 200 in the cavity 1a. One end of the heating tube 14 extends out of the test box 1, and the end of the heating tube 14 extending out of the test box 1 is connected to a temperature controller 16, and the temperature sensor 15 is connected to the temperature controller 16. The temperature sensor 15 feeds back the detected temperature information of the test medium 200 in the cavity 1a to the temperature controller 16, and the temperature controller 16 controls the heating power of the heating tube 14 according to the received temperature information, thereby realizing automatic control and adjustment of the temperature of the test medium 200, so that the temperature of the test medium 200 is maintained at a desired temperature. Preferably, the temperature controller 16 can be a digital display temperature controller, and the temperature sensor 15 is a salt water corrosion resistant temperature sensor.

[0044] In this embodiment, preferably, a stirring paddle 17 is provided in the cavity 1a of the test box 1, and the temperature of the test medium 200 can be made more uniform by stirring the test medium 200 with the stirring paddle 17. A plurality of stirring paddles 17 can be provided, and the plurality of stirring paddles 17 are evenly distributed around or at the bottom of the cavity 1a. The stirring paddle 17 is made of a salt water corrosion resistant material, and can be made of polytetrafluoroethylene or stainless steel with a polytetrafluoroethylene coating.

[0045] In this embodiment, the power supply 4 can provide direct current, the voltage can be adjusted, and the positive and negative poles can be switched. Preferably, one pole of the power supply 4 is provided with a first lead 41, the end of the first lead 41 is connected with an alligator clip, and the first lead 41 is used to connect with the electrode 3. The other pole of the power supply 4 is provided with a plurality of parallel second lead wires 42, the end of the second lead wire 42 is connected with an alligator clip, and the second lead wire 42 is used to connect with the cable 100. The plurality of second lead wires 42 can be conveniently connected with a plurality of cables 100 to be tested, thereby applying a direct current voltage to the plurality of cables 100 at the same time, realizing the simultaneous testing of the plurality of cables 100, and improving the test efficiency.

[0046] In this embodiment, since the electrode 3 is easily corroded by the test medium 200 and needs to be replaced after a period of use, a movable electrode is required. To facilitate the replacement of the electrode 3, preferably, the second through hole 22 on the cover 2 can be used for the electrode 3 to be inserted and removed.

[0047] The method for performing a cable hydrolysis resistance test using the cable hydrolysis resistance test system of the present embodiment is as follows: prepare a test medium 200 of the required concentration and pour it into the cavity 1a of the test box 1, the amount of the test medium 200 being such that the liquid level of the test medium 200 in the cavity 1a is between the upper limit sensor 6 and the lower limit sensor 7 after the cable 100 to be tested is placed therein; the control temperature of the temperature controller 16 is set to the required temperature of the test medium 200, and the temperature controller 16 controls the heating tube 14 to work according to the temperature information of the test medium 200 fed back by the temperature sensor 15, heats the test medium 200, and raises the temperature of the test medium 200 and stabilizes it at the required temperature; open the lid 2, and place the prepared cable 100 therein; The test box 1 is inserted into the test medium 200, and both ends of the cable 100 extend out of the cover 2 through the two first through holes 21 and are fixed on the corresponding fixing parts 11. Then the cover 2 is covered on the test box 1, and the shielding sheet 10 is closed; the electrode 3 passes through the cover 2 from the second through hole 22 and is immersed in the test medium 200, the alligator clip on the first lead wire 41 of the power supply 4 is connected to the electrode 3, and the alligator clip on the second lead wire 42 of the power supply 4 is connected to one end of the conductor of the cable 100. The number of the second lead wires 42 of the power supply 4 used corresponds to the number of cables 100 placed in the test box 1, the power supply 4 is adjusted to the required voltage, the solenoid valve 8 on the water supply pipe 5 is in the closed state, and the test is started. As the test progresses, the water in the test medium 200 evaporates. When the liquid level of the test medium 200 in the cavity 1a drops to the lower limit sensor 7, the solenoid valve controller 9 controls the solenoid valve 8 to open and start to add water to the cavity 1a until the liquid level of the test medium 200 in the cavity 1a rises to the upper limit sensor 6. The solenoid valve controller 9 controls the solenoid valve 8 to close and stop adding water to the cavity 1a. When the insulation resistance of the cable 100 needs to be tested during the test, the power supply 4 can be disconnected and measured with an external high resistance meter. After the measurement is completed, the power supply 4 can be turned on again to continue the test.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cable hydrolysis resistance testing system, characterized in that: The invention comprises a test box (1), a cover (2), an electrode (3), a power source (4) and a water supply pipe (5); the test box (1) is hollow inside to form a cavity (1a) with an open top surface, and the cavity (1a) is used to contain a test medium (200) and a cable (100); the cover (2) is detachably mounted on the top of the test box (1) and closes the opening of the cavity (1a); the cover (2) is provided with a first through hole (21) for the cable (100) to pass through and a second through hole (22) for the electrode (3) to pass through; the two poles of the power source (4) are respectively connected to the cable (100) and the electrode (3); and the water supply pipe (5) is connected to the cavity (1a).

2. The cable hydrolysis resistance testing system according to claim 1, characterized in that: The test box (1) is provided with a liquid level sensor for detecting the liquid level of the test medium (200) in the cavity (1a), the water supply pipe (5) is provided with a valve, and the liquid level sensor is connected to the valve.

3. The cable hydrolysis resistance testing system according to claim 2, characterized in that: The liquid level sensor comprises an upper limit sensor (6) provided at the highest liquid level of the test medium (200) in the cavity (1a) and a lower limit sensor (7) provided at the lowest liquid level of the test medium (200) in the cavity (1a).

4. The cable hydrolysis resistance testing system according to claim 2 or 3, characterized in that: The valve comprises a solenoid valve (8) installed on the water supply pipe (5) and a solenoid valve controller (9) for controlling the opening or closing of the solenoid valve (8), and the liquid level sensor is connected to the solenoid valve controller (9).

5. The cable hydrolysis resistance testing system according to claim 1, characterized in that: The cover (2) is provided with a shielding sheet (10) at the first through hole (21) which is capable of covering or opening the first through hole (21).

6. The cable hydrolysis resistance testing system according to claim 1, characterized in that: The cover (2) is provided with a fixing piece (11) for fixing the cable (100).

7. The cable hydrolysis resistance testing system according to claim 1, characterized in that: A heating chamber (1b) independent of the cavity (1a) is also formed inside the test box (1); the heating chamber (1b) is separated from the cavity (1a) by a heat conducting plate (12); and a heating device is provided in the heating chamber (1b).

8. The cable hydrolysis resistance testing system according to claim 7, characterized in that: The heating device comprises a heating medium (13) and a heating tube (14) contained in the heating chamber (1b).

9. The cable hydrolysis resistance testing system according to claim 8, characterized in that: A temperature sensor (15) for detecting the temperature of a test medium (200) in the cavity (1a) is provided in the cavity (1a); the heating tube (14) is connected to a temperature controller (16); and the temperature sensor (15) is connected to the temperature controller (16).

10. The cable hydrolysis resistance testing system according to claim 1, characterized in that: One pole of the power source (4) is provided with a first lead wire (41) for connecting to the electrode (3), and the other pole is provided with a plurality of second lead wires (42) connected in parallel for connecting to the cable (100).

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