Direct-current leakage current testing device for insulated water conduit

Abstract

The utility model relates to the technical field of insulating material testing, and discloses an insulating water conduit direct current leakage current testing device which is composed of a direct current high voltage power supply, a connecting wire, a voltage divider, a high voltage end hoop, an insulating water conduit, a grounding end hoop, a grounding wire and a suspension type insulator string. And is in a suspended state. According to the utility model, the problem of leakage current increase caused by an insulation support can be eliminated, a more accurate DC leakage current testing device is provided for an insulation water conduit, and meanwhile, the high-voltage end hoop and the grounding end hoop are designed into cones, so that the application range is wider.

Description

Technical Field

[0001] The utility model belongs to the technical field of insulation material testing and relates to a device for testing direct current leakage current of an insulating water pipe. Background Art

[0002] During high-voltage generator operation, leakage current flows between the high-voltage terminal and the ground. While small leakage currents do not affect generator performance, increased leakage currents indicate potential moisture, dirt, carbonization, or cracking on the insulation surface, as well as internal cracking. In severe cases, this can cause surface flashover or even insulation breakdown, threatening the generator's operational safety. The insulated water pipe, connected between the high-voltage generator and the ground, carries leakage current. Testing the pipe's ability to withstand high voltages—that is, measuring the leakage current—is crucial. The principle of DC leakage current measurement is essentially the same as that of insulation resistance, except that DC leakage current measurement operates at a higher DC voltage and is infinitely adjustable. Measuring DC leakage current at high voltage allows for more timely and accurate detection of insulation defects, offering greater sensitivity and effectiveness. The existing high-voltage DC leakage current test method consists of a DC high-voltage source, a voltage divider, an insulated water pipe, a connecting wire and a ground wire. The insulated water pipe is placed on an insulating bracket, one end is connected to the DC high voltage, and the other side is connected to the ground wire. This wiring method has the main problems of an unstable insulated water pipe, a loose connecting wire, and easy contamination of the bracket leakage current, resulting in inaccurate test results. Utility Model Content

[0003] In response to the above problems, the purpose of the present utility model is to provide an insulated water pipe DC leakage current testing device, which has a sample fixing end clamp and a hanging insulator string, which can firmly fix the sample between the high voltage and the grounding wire, eliminating the influence of the bracket leakage current on the test results.

[0004] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0005] A DC leakage current test device for an insulated water diversion pipe consists of a DC high-voltage power supply, a connecting line, a voltage divider, a high-voltage end clamp, an insulated water diversion pipe, a grounding end clamp, a grounding wire and a hanging insulator string. The DC high-voltage power supply outputs a high voltage, which is transmitted to the voltage divider through the connecting line. A high-voltage end clamp is installed on the top of the voltage divider, and the high-voltage end clamp is inserted into the inner cavity of the insulated water diversion pipe to provide a DC high voltage for the insulated water diversion pipe. The inner cavity on the other side of the insulated water diversion pipe is inserted by a grounding end clamp, and the grounding end clamp is connected to the grounding wire. The grounding wire is fixed on the hanging insulator string and is in a suspended state. In the connected line, one side of the insulated water diversion pipe is fixed on the high-voltage end clamp, and the other side is fixed on the grounding end clamp. The two end clamps firmly fix the insulated water diversion pipe and it is in a suspended state.

[0006] In the above-mentioned insulated water pipe DC leakage current test device, the high-voltage end clamp cooperates with the insulated water pipe, and one end is a cone with a bottom diameter of 40mm and a cone height of 80mm. The other end is a threaded bolt with a length of 10mm and a diameter of 10mm, which is screwed into the screw hole at the top of the voltage divider.

[0007] In the above-mentioned insulated water pipe DC leakage current test device, the grounding end clamp cooperates with the insulated water pipe and one end is a cone with a bottom diameter of 40mm and a cone height of 80mm. The other end is a ring with a diameter of 10mm for connecting the grounding wire.

[0008] In the above-mentioned insulating water pipe DC leakage current testing device, the insulating water pipe serves as a sample, is made of polytetrafluoroethylene material, and is in the shape of a circular tube.

[0009] In the above-mentioned insulated water pipe DC leakage current testing device, the suspended insulator string is composed of four insulators connected in series.

[0010] The advantages of adopting the utility model are:

[0011] 1. The utility model utilizes high voltage end clamps and grounding end clamps to replace the insulating bracket, firmly fixes the insulating water pipe and suspends it in the air, eliminates the problem of increased leakage current caused by the insulating bracket, and improves measurement accuracy.

[0012] 2. The utility model designs the high voltage end hoop and the grounding end hoop into a conical structure, which can be inserted into the inner cavity of insulating water pipes of different diameters and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a DC leakage current testing device for an insulated water pipe.

[0014] Explanation of the marks in the figure: 1-DC high-voltage power supply; 2-connecting wire; 3-voltage divider; 4-high-voltage terminal clamp; 5-insulated water pipe; 6-grounding terminal clamp; 7-grounding wire; 8-suspension insulator string. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, the embodiments obtained by those skilled in the art without making any creative work are all within the scope of protection of the present invention.

[0016] In the description of the present invention, it needs to be explained that the positional relationships indicated by terms such as "upper", "lower", "inside" and "outside" are only based on the positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the referred parts have a specific orientation or are constructed and manufactured in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0017] It is also noted that, unless otherwise specified and limited, the term "fixed" is used in a broad sense and may refer to a fixed connection, a detachable connection or an integral connection. The relevant meanings of the above terms in this utility model may be understood according to specific circumstances.

[0018] like Figure 1 As shown, a DC leakage current test device for an insulated water pipe comprises a DC high-voltage power supply 1, a connecting line 2, a voltage divider 3, a high-voltage end clamp 4, an insulated water pipe 5, a grounding end clamp 6, a grounding wire 7 and a suspended insulator string 8. The DC high-voltage power supply 1 outputs a high voltage, which is transmitted to the voltage divider 3 through the connecting line 2. A high-voltage end clamp 4 is installed on the top of the voltage divider 3. The high-voltage end clamp 4 is inserted into the inner cavity of the insulated water pipe 5 to provide a DC high voltage for the insulated water pipe 5. The inner cavity on the other side of the insulated water pipe 5 is inserted by the grounding end clamp 6. The grounding end clamp 6 is connected to the grounding wire 7. The grounding wire 7 is fixed on the suspended insulator string 8. The grounding wire 7 is in a suspended state. In the connected line, one side of the insulated water pipe 5 is fixed on the high-voltage end clamp 4, and the other side is fixed on the grounding end clamp 6. The two end clamps firmly fix the insulated water pipe 5 and keep it in a suspended state.

[0019] Specifically, the high-voltage end clamp 4 cooperates with the insulating water pipe 5. One end of the cone is a cone with a bottom diameter of 40 mm and a cone height of 80 mm. The other end is a threaded bolt with a length of 10 mm and a diameter of 10 mm, which is screwed into the screw hole at the top of the voltage divider 3.

[0020] Preferably, the grounding end clamp 6 cooperates with the insulating water pipe 5 and one end is a cone with a bottom diameter of 40 mm and a cone height of 80 mm. The other end is a ring with a diameter of 10 mm for connecting the grounding wire 7.

[0021] Preferably, the insulating water pipe 5 is used as a sample, is made of polytetrafluoroethylene material, and is in the shape of a circular tube.

[0022] More preferably, the suspension insulator string 8 is composed of four insulators connected in series.

[0023] The operating principle of this utility model is:

[0024] Screw the high-voltage end clamp 4 into the screw hole at the top of the voltage divider 3, wrap the grounding wire 7 around the ring of the grounding end clamp 6, pass the grounding wire 7 through the suspension hook of the suspension insulator string 8 and connect it to the ground, fix the insulated water pipe 5 between the high-voltage end clamp 4 and the grounding end clamp 6, connect the DC high-voltage source 1 and the voltage divider 3 together with the connecting wire 2, and the test device connection is completed.

[0025] Press the start button of the DC high-voltage power supply 1 to increase the voltage to the specified value, and read the current value displayed on the DC high-voltage power supply 1, which is the DC leakage current value of the insulated water pipe 5.

[0026] After the test is completed, turn off the DC high voltage source 1, hang the discharge rod on the high voltage end clamp 4 for safe discharge, remove the insulating water pipe 5, and disconnect the wiring of each part.

[0027] Finally, the scope of protection of the present invention is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. Provided such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to encompass such modifications and variations.

Claims

1. A device for testing DC leakage current of an insulated water pipe, characterized by: The invention comprises a DC high-voltage power supply (1), a connecting line (2), a voltage divider (3), a high-voltage end hoop (4), an insulating water diversion pipe (5), a grounding end hoop (6), a grounding wire (7) and a hanging insulator string (8). The DC high-voltage power supply (1) outputs a high voltage, which is transmitted to the voltage divider (3) through the connecting line (2). A high-voltage end hoop (4) is installed on the top of the voltage divider (3). The high-voltage end hoop (4) is inserted into the inner cavity of the insulating water diversion pipe (5). 5) provides a DC high voltage, a grounding end hoop (6) is inserted into the inner cavity of the other side of the insulating water diversion pipe (5), the grounding end hoop (6) is connected to the grounding wire (7), the grounding wire (7) is fixed on the suspension insulator string (8), and the grounding wire (7) is in a suspended state. In the connected line, one side of the insulating water diversion pipe (5) is fixed on the high voltage end hoop (4), and the other side is fixed on the grounding end hoop (6). The two end hoops firmly fix the insulating water diversion pipe (5) and the insulating water diversion pipe is in a suspended state.

2. The device for testing DC leakage current of an insulated water pipe according to claim 1, characterized in that: The high voltage end hoop (4) cooperates with the insulating water pipe (5) and has a cone at one end, the bottom diameter of the cone is 40 mm, the cone height is 80 mm, and the other end is a threaded bolt with a length of 10 mm and a diameter of 10 mm, which is screwed into the screw hole at the top of the voltage divider (3).

3. The device for testing DC leakage current of an insulated water pipe according to claim 1, wherein: The grounding end hoop (6) cooperates with the insulating water pipe (5) and has a cone at one end, the bottom diameter of the cone is 40mm, the cone height is 80mm, and the other end is a ring with a diameter of 10mm for connecting the grounding wire (7).

4. The device for testing DC leakage current of an insulated water pipe according to claim 1, wherein: The insulating water diversion pipe (5) is used as a sample and is made of polytetrafluoroethylene material and is in the shape of a circular tube.

5. The device for testing DC leakage current of an insulated water pipe according to claim 1, characterized in that: The suspended insulator string (8) is composed of four insulators connected in series.

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