A large cross-section submarine cable water-blocking type line conductor direct current resistance testing device and method

Abstract

The application discloses a large-section submarine cable water-blocking type wire conductor DC resistance testing device, which comprises a sample support, a conductor fixing clamp arranged on the base, and a measured conductor suspended by the conductor fixing clamp; a potential electrode clamp arranged on the measured conductor in pairs; and conductor end head clamps inserted into two ends of the measured conductor, wherein the conductor end head clamp comprises an end head clamp block made of the same material as the measured conductor, a stepped circular table-shaped inner hole is formed in the end head clamp block, the shape and number of the circular table are the same as those of the measured conductor, and a current electrode terminal is arranged on the conductor end head clamp; and a double-arm bridge electrically connected with the potential electrode clamp and the current electrode terminal to obtain potential electrode and current electrode parameters of the measured conductor. The testing device improves the accuracy of detection data and is convenient and reliable to test. The application further discloses a large-section submarine cable water-blocking type wire conductor DC resistance testing method.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a device and method for testing the DC resistance of a water-blocking conductor in a large-section submarine cable. Background Technology

[0002] The 21st century is hailed as the century of the ocean, and the development of marine resources is fundamental to ensuring national security and promoting economic and social development. Submarine cables are a crucial link in offshore resource development, primarily used in offshore wind power, offshore oil and gas extraction, power transmission between land and islands, and communication transmission. Currently, the development trend of submarine cables is gradually shifting towards "far-sea and deep-sea" applications, thus placing higher demands on submarine cables. Submarine cable systems are developing towards larger capacity, longer lengths, direct current operation, dynamic operation, and system integration, while submarine cable engineering is moving towards total carrier operations.

[0003] In practical applications, large-section conductors are typically used to meet the high-capacity requirements of cable systems. In submarine cables, high-capacity conductors are usually split conductors or shaped conductors. Among them, shaped conductors are made of trapezoidal monofilaments tightly twisted together in layers. To meet the requirements, a layer of semi-conductive resistance water tape is longitudinally wrapped around each layer of monofilaments during the production process. The conductivity of the water tape is lower than that of the conductor, so the presence of the semi-conductive resistance water tape will introduce errors into the measurement of conductor resistance.

[0004] In actual measurement, at least 200mm of the semi-conductive water-blocking strip at the end of the water-blocking conductor is typically removed, the single filament is restored to its original shape, and the ends of the conductor under test are cast with an alloy. Finally, the conductor is fixed on the resistance meter for measurement. This measurement method has the following problems and defects:

[0005] (1) Currently, before measuring the resistance of water-blocking conductors, it is necessary to process the semiconducting resistive water strip. The trapezoidal single wire is harder than the circular single wire, and it is very difficult to restore it to its original shape, which affects the alloy casting effect.

[0006] (2) The current electrode is directly clamped on the clamps at both ends of the conductor. There will be gaps between the clamp cross section and the conductor, which will reduce the actual contact area and affect the accuracy of the test data. Summary of the Invention

[0007] In view of the above problems, one object of the present invention is to provide a DC resistance testing device for a large cross-section submarine cable water-blocking conductor, which realizes close contact between the clamp and the conductor, avoids the conductor from becoming loose during resistance measurement, and ensures the accuracy of the test data.

[0008] Another objective of this invention is to provide a method for testing the DC resistance of a water-blocking conductor in a large-section submarine cable, thereby reducing operational difficulty and improving the accuracy of measurement results.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A DC resistance testing device for a large cross-section submarine cable water-blocking conductor includes:

[0011] The sample support includes a base and a conductor fixing clamp set on the base. The conductor to be tested is clamped and suspended by the conductor fixing clamp, and the two ends of the conductor to be tested are made into a stepped cone shape.

[0012] Potential electrode clamps are installed in pairs on the conductor being measured;

[0013] The conductor end clamp consists of two conductor end clamps inserted into the two ends of the conductor being tested. Each conductor end clamp includes an end clamp block made of the same material as the conductor being tested. The end clamp block has a stepped frustum-shaped inner hole, and the shape and number of frustums are the same as the shape and number of layers of the conductor being tested. The conductor end clamp is equipped with a current terminal.

[0014] The double-arm bridge is electrically connected to the potential electrode clamp and the current electrode terminal respectively to obtain the potential electrode and current electrode parameters of the conductor under test.

[0015] Specifically, the depth of the inner hole is 90% of the thickness of each conductor layer, and the step is chamfered at 30° to 60°.

[0016] Specifically, the end clamp consists of two separate semi-cylinders, which are fixed to the outer ring by a hose clamp.

[0017] Specifically, the double-arm bridge is equipped with a temperature and humidity detector to monitor environmental conditions and automatically convert them into the DC resistance of the conductor at 20°C.

[0018] Specifically, each conductor end clamp is equipped with two current terminals, which are connected in series to the corresponding electrode interfaces of the double-arm bridge.

[0019] In particular, there are more than one pair of potential electrode clamps, and each potential electrode clamp is detachably assembled on the base and its relative position is adjustable.

[0020] Specifically, when the length of the conductor being tested is greater than 1.5m, the spacing between each pair of potential electrode clamps is set to 1m.

[0021] Specifically, several conductor fixing clamps are located between the conductor end clamp and the potential electrode clamp, and do not contact the conductor end clamp. Each conductor fixing clamp is detachably assembled on the base, and its relative position is adjustable.

[0022] Specifically, both the potential electrode clamp and the conductor fixing clamp are ring-shaped clamp structures, which include a fixing clamp and a movable clamp that work together to hold the conductor under test.

[0023] On the other hand, the present invention adopts the following technical solution:

[0024] A method for testing the DC resistance of a water-blocking conductor in a large-section submarine cable, based on the aforementioned testing device for the DC resistance of a water-blocking conductor in a large-section submarine cable, includes the following steps:

[0025] Cut a sample to the required length of the conductor to be tested, and peel off the layers of conductor from both ends of the sample.

[0026] After straightening the sample, the conductor is cut off layer by layer to make the two ends form a stepped cone shape with the shortest length of the outermost conductor and the longest length of the innermost conductor. Then, the semiconducting resistive water strip on the conductor is peeled off layer by layer.

[0027] The sample is clamped and suspended in the air using a conductor fixing fixture;

[0028] Secure the conductor end clamps to both ends of the sample;

[0029] The potential electrode clamp is attached to the inside of the conductor fixing clamp on the sample;

[0030] Connect the potential electrode clamp to the corresponding electrode interface of the double-arm bridge using the connecting wire, and connect the current terminal on the conductor end clamp to the corresponding electrode interface of the double-arm bridge.

[0031] Perform the test and take the reading; the displayed value is the resistance of the conductor at that length. Then, deduce the resistance of the conductor per kilometer.

[0032] In summary, the beneficial effects of the present invention are as follows: the DC resistance testing device and method for large cross-section submarine cable water-blocking conductors have been modified based on the double-arm bridge to improve the sample support and conductor end, so as to realize the measurement of the resistance of all types of large cross-section conductors, and ensure that the clamps are in close contact with each layer of conductors, thereby improving the accuracy of the test data and making the test convenient and reliable. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the DC resistance testing device and method for large cross-section submarine cable water-blocking conductors provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the end shape of the conductor under test in the DC resistance testing device and method for large cross-section submarine cable water-blocking conductors provided in the embodiments of the present invention.

[0035] Figure 3 This is a schematic diagram of the conductor end clamp in the DC resistance testing device and method for large cross-section submarine cable water-blocking conductors provided in the embodiments of the present invention. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] Please see Figure 1 As shown, this preferred embodiment provides a DC resistance testing device for a large cross-section submarine cable water-blocking conductor, including a sample support 1, a potential electrode clamp 2, a conductor end clamp 3, and a double-arm bridge 4.

[0041] It should be noted that the conductor 8 under test is not limited to large cross-section submarine cable water-blocking conductors, but can also be used in the resistance measurement of other types of conductors, such as split conductors and round compacted conductors.

[0042] The sample support 1 includes a base and a conductor fixing clamp 5 mounted on the base. The conductor 8 to be tested is clamped and suspended by the conductor fixing clamp 5, and both ends of the conductor 8 to be tested are made into stepped cone shapes, such as... Figure 2 As shown, this special end shape can increase the contact area, ensure the contact effect, and facilitate the measurement of the resistance of large cross-section conductors.

[0043] Potential electrode clamps 2 are installed in pairs on the conductor 8 under test. There are more than one pair of potential electrode clamps 2. Each potential electrode clamp 2 is detachable and can be assembled and disassembled on the base, and its relative position is adjustable. To ensure the accuracy of the test data, the length of the conductor 8 under test should be more than 1.5m, and the spacing between each pair of potential electrode clamps 2 is preferably set to 1m.

[0044] Two conductor end clamps 3 are inserted into the two ends of the conductor 8 being tested. The conductor end clamps 3 here include end clamp blocks made of the same material as the conductor 8 being tested, such as... Figure 3 As shown, the end clamping block has a stepped frustum-shaped inner hole 6, and the shape and number of frustums are the same as the shape and number of layers of the conductor being tested 8. In particular, the depth of the frustum of the inner hole 6 is 90% of the thickness of each conductor layer, and a chamfer of 30° to 60° is provided at the step. In this embodiment, 45° is used as an example to improve the tightness of contact with the conductor being tested 8.

[0045] Specifically, the end clamp consists of two separate semi-cylinders, which are fixed to the outer ring by a hose clamp to facilitate installation and ensure reliable fixation.

[0046] The conductor end clamp 3 is provided with a current terminal 7. Multiple current terminals 7 can be used in series. In this embodiment, two current terminals 7 are provided on each conductor end clamp 3.

[0047] Several conductor fixing clamps 5 are located between the conductor end clamp 3 and the potential electrode clamp 2, and do not contact the conductor end clamp 3. Each conductor fixing clamp 5 is detachably assembled on the base, and its relative position is adjustable.

[0048] The potential electrode clamp 2 and the conductor fixing clamp 5 here both adopt a ring clamp structure. The ring clamp includes a fixed clamp and a movable clamp that work together to clamp the conductor 8 under test, which is convenient for operation.

[0049] The double-arm bridge 4 is electrically connected to the potential electrode clamp 2 and the current terminal 7 respectively. Specifically, it includes four electrode interfaces: C1, C2, P1, and P2, to obtain the potential electrode and current electrode parameters of the conductor under test 8.

[0050] Furthermore, the double-arm bridge 4 incorporates a temperature and humidity detector into the existing double-arm bridge 4 technology to monitor environmental conditions and automatically convert them into the DC resistance of the conductor at 20°C.

[0051] Furthermore, this embodiment also provides a method for testing the DC resistance of a large-section submarine cable water-blocking conductor, based on the aforementioned large-section submarine cable water-blocking conductor DC resistance testing device, which includes the following steps:

[0052] Step 1: Cut a sample to the required length of the conductor 8 to be tested, and strip the layers of conductor from both ends of the sample. To ensure the accuracy of the test data, the length of the conductor 8 to be tested should be more than 1.5m.

[0053] Step 2: After straightening the sample, cut off the conductor layer by layer to make the two ends form a stepped cone shape with the shortest length of the outermost conductor and the longest length of the innermost conductor. Then peel off the semiconducting resistance water strip on the conductor layer by layer.

[0054] Step 3: The sample is clamped and suspended in the air using conductor fixing clamp 5, specifically by supporting and fixing it at both ends near the end of the sample.

[0055] The conductor end clamp 3 is fixed to both ends of the sample. Specifically, the two semi-cylinders are combined to clamp the ends of the sample and the outer ring is fixed by the hose clamp.

[0056] The potential electrode clamp 2 is clamped inside the conductor fixing clamp 5 on the sample, and the distance between the two potential electrode clamps 2 is set to 1m.

[0057] Step 4: Connect the potential electrode clamp 2 to the P1 and P2 electrode interfaces of the double-arm bridge 4 using connecting cables. Connect the current terminal 7 on the conductor end clamp 3 to the C1 and C2 electrode interfaces of the double-arm bridge 4. Here, record the environmental parameters, turn on the double-arm bridge 4, and input the environmental parameters into the instrument.

[0058] Step 5: Perform the test and read the value. The displayed value is the resistance of the conductor at that length. Then, derive the resistance per kilometer of conductor using the formula R = Rx * L.

[0059] In summary, the above-mentioned DC resistance testing device and method for large cross-section submarine cable water-blocking conductors has been modified based on the double-arm bridge to improve the sample support and conductor end, so as to realize the measurement of the resistance of all types of large cross-section conductors. It also ensures that the clamps are in close contact with each layer of conductor, improves the accuracy of the test data, and makes the test convenient and reliable.

[0060] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above examples. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A DC resistance testing device for a large cross-section submarine cable water-blocking conductor, characterized in that, include The sample support includes a base and a conductor fixing clamp disposed on the base. The conductor to be tested is clamped and suspended by the conductor fixing clamp, and the two ends of the conductor to be tested are made into a stepped cone shape. Potential electrode clamps are installed in pairs on the conductor being measured; A conductor end clamp, wherein two conductor end clamps are inserted into the two ends of the conductor to be tested, the conductor end clamps include end clamp blocks of the same material as the conductor to be tested, the end clamp blocks have stepped frustum-shaped inner holes, and the shape and number of frustums are the same as the shape and number of layers of the conductor to be tested, and the conductor end clamps are provided with current terminals; A double-arm bridge is electrically connected to the potential electrode clamp and the current terminal respectively to obtain the potential electrode and current electrode parameters of the conductor under test. The depth of the frustum of the inner hole is 90% of the thickness of each conductor layer, and the step is provided with a chamfer of 30° to 60°; The end clamp consists of two separate semi-cylinders, which are fixed to the outer ring by a hose clamp.

2. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 1, characterized in that: The double-arm bridge is equipped with a temperature and humidity detector to monitor environmental conditions and automatically convert them into the DC resistance of the conductor at 20°C.

3. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 1, characterized in that: Each conductor end clamp is equipped with two current terminals, which are connected in series to the corresponding electrode interfaces of the double-arm bridge.

4. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 1, characterized in that: The potential electrode clamps are provided in more than one pair, and each potential electrode clamp is detachably assembled and disassembled on the base, and the relative position is adjustable.

5. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 4, characterized in that: The length of the conductor being tested is greater than 1.5m, and the spacing between each pair of potential electrode clamps is set to 1m.

6. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 1, characterized in that: Several conductor fixing clamps are located between the conductor end clamp and the potential electrode clamp, and do not contact the conductor end clamp. Each conductor fixing clamp is detachably assembled on the base, and its relative position is adjustable.

7. The DC resistance testing device for large cross-section submarine cable water-blocking conductors according to claim 1, characterized in that: Both the potential electrode clamp and the conductor fixing clamp are ring clamp structures, and the ring clamp includes a fixing clamp and a movable clamp that work together to clamp the conductor under test.

8. A method for testing the DC resistance of a water-blocking conductor in a large-section submarine cable, based on the DC resistance testing device for a water-blocking conductor in a large-section submarine cable as described in any one of claims 1-7, characterized in that, Including the following steps: Cut a sample to the required length of the conductor to be tested, and peel off the layers of conductor from both ends of the sample. After straightening the sample, the conductor is cut off layer by layer to make the two ends form a stepped cone shape with the shortest length of the outermost conductor and the longest length of the innermost conductor. Then, the semiconducting resistive water strip on the conductor is peeled off layer by layer. The sample is clamped and suspended in the air using a conductor fixing fixture; Secure the conductor end clamps to both ends of the sample; The potential electrode clamp is attached to the inside of the conductor fixing clamp on the sample; Connect the potential electrode clamp to the corresponding electrode interface of the double-arm bridge using the connecting wire, and connect the current terminal on the conductor end clamp to the corresponding electrode interface of the double-arm bridge. Perform the test and take the reading; the displayed value is the resistance of the conductor at that length. Then, deduce the resistance of the conductor per kilometer.

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