Equipment and method for acceptance testing of transmission lines

Abstract

This invention relates to an apparatus and method for acceptance testing of transmission lines, used to perform acceptance tests on cable ends. It includes a withstand voltage device and a lifting device. The withstand voltage device comprises a metal sealed container, a voltage equalization hood, conductive rods, a voltage equalization sleeve, and a lead end. The voltage equalization hood is connected to the upper metal electrode of the cable end. The conductive rods are connected to both the voltage equalization hood and the voltage equalization sleeve. The voltage equalization sleeve is connected to a high-voltage lead through the lead end. The metal sealed container is fitted over the voltage equalization sleeve and the cable end, and is filled with insulating gas. The lifting device includes a slide table, a stepper motor, and a clamp. The clamp holds the lower part of the metal sealed container, and the stepper motor drives the clamp to slide up and down along the slide table. Compared with existing technologies, this invention has advantages such as not requiring third-party cooperation, effectively shortening cable construction time, and being simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of transmission line acceptance equipment, and in particular to an apparatus and method for transmission line acceptance testing. Background Technology

[0002] After traditional transmission lines are installed and laid, the equipment terminals are first installed in gas-insulated switches. After the transmission line operating voltage is applied, the equipment is run unloaded for 24 hours. If no breakdown or flashover occurs, this is used as the basis for handover, and then the line is put into formal operation on the power grid.

[0003] This process requires coordination among multiple parties to carry out the final test. First, it increases the cable acceptance period. Second, the coordination process may damage the cable and accessories. Third, the applied voltage is low, which cannot effectively assess the reliability of the transmission line. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, which has a long cable acceptance period, and to provide a device and method for acceptance testing of transmission lines.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An apparatus for acceptance testing of transmission lines, used to perform acceptance testing on cable ends, includes a withstand voltage device and a lifting device. The withstand voltage device includes a metal sealed container, a voltage equalization hood, a conductive rod, a voltage equalization sleeve, and a lead end. The voltage equalization hood is connected to the upper metal electrode of the cable end. The conductive rod is connected to the voltage equalization hood and the voltage equalization sleeve respectively. The voltage equalization sleeve is connected to a high-voltage lead through the lead end. The metal sealed container is fitted outside the voltage equalization sleeve and the cable end, and the metal sealed container is filled with insulating gas.

[0007] The lifting device includes a slide, a stepper motor, and a clamp. The clamp is held in place at the bottom of the metal sealed container, and the stepper motor drives the clamp to slide up and down along the slide.

[0008] Furthermore, the metal sealing can and the voltage equalizing bushing are an integrated structure. The metal sealing can is used to shield the electric field, so that the voltage distribution at the cable end under the voltage of the high-voltage lead is consistent with normal operation. The voltage equalizing bushing is used to equalize the voltage applied to the withstand voltage device.

[0009] Furthermore, one side of the equalizing shield is bolted to the upper metal electrode of the cable end, and the other end is provided with a mounting hole for connecting a conductive rod.

[0010] Furthermore, there are multiple slides and stepper motors, each slide is connected to a corresponding stepper motor, and the multiple slides are distributed around the gripper and connected to the gripper through the stepper motors.

[0011] Furthermore, there are four slides and four stepper motors. The four slides are distributed at the four corners of the gripper and are connected to the gripper through the stepper motors.

[0012] Furthermore, the device also includes a controller that is connected to each stepper motor.

[0013] Furthermore, the cable end, voltage equalizing cover, conductive rod, and voltage equalizing sleeve are distributed sequentially from bottom to top along the same central axis.

[0014] The present invention also provides a method for accepting power transmission lines using the equipment described above for power transmission line acceptance testing, comprising the following steps:

[0015] S1: Obtain the cable end and fix it in the predetermined position;

[0016] S2: The metal sealing container is clamped at the bottom by the clamp of the lifting device, and the stepper motor is controlled to drive the metal sealing container to move to the top of the cable end;

[0017] S3: Connect the equalizing shield to the upper metal electrode of the cable end with bolts, and insert the conductive rod into the hole above the equalizing shield;

[0018] S4: Control the stepper motor to drive the clamp to descend along the slide to the cable end until the metal sealing can is sealed to the bottom of the cable end;

[0019] S5: Fill the cavity between the sealed container, the equalizing bushing and the cable end with insulating gas;

[0020] S6: Connect the high-voltage lead to the lead end of the equalizing bushing, turn on the voltage, and conduct the transmission line acceptance test.

[0021] Furthermore, during the acceptance test of the transmission line, a handover test of 1.6-1.9 times the operating voltage of the transmission line is applied through the high-voltage lead for 0.8-1.5 hours.

[0022] Furthermore, there are multiple slides and stepper motors, and the method synchronously controls each stepper motor to drive the gripper to move the metal sealing can up and down along the slide.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) No third-party cooperation required: The present invention uses a withstand voltage device composed of a metal sealed can and a pressure equalizing bushing. The metal sealed can acts as a shield for the electric field, so that the electric field distribution at the cable end under the test voltage is consistent with that under normal operation. The pressure equalizing bushing can equalize the voltage applied to the withstand voltage device and prevent surface discharge. It is used to simulate standard GIS switches and pressure bushings respectively. Test personnel can complete the installation themselves without the need for third-party cooperation.

[0025] (2) Effectively shortens the cable construction period: The development of the withstand voltage device does not require 24-hour testing and cumbersome third-party communication, nor does it require waiting for all switches to be installed before testing can be carried out. It can apply 1.7 times the operating voltage of the transmission line for a 1-hour handover test. The withstand voltage time is only 1 hour, which shortens the test time and saves time and effort.

[0026] (3) Simple and convenient: The present invention is designed with a lifting device, which can complete the installation without the need for a traditional crane. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a device for acceptance testing of power transmission lines provided in an embodiment of the present invention;

[0028] In the diagram, 1 is the cable end, 2 is the metal sealed container, 3 is the equalizing cover, 4 is the insulating gas, 5 is the conductive rod, 6 is the equalizing sleeve, 7 is the lead end, 8 is the slide table, 9 is the stepper motor, and 10 is the clamp. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a device for acceptance testing of transmission lines, used to conduct acceptance testing on cable end 1. It includes a withstand voltage device and a lifting device. The withstand voltage device includes a metal sealing canister 2, a voltage equalization cover 3, a conductive rod 5, a voltage equalization sleeve 6, and a lead end 7. The voltage equalization cover 3 is connected to the upper metal electrode of the cable end 1. The conductive rod 5 is connected to the voltage equalization cover 3 and the voltage equalization sleeve 6 respectively. The voltage equalization sleeve 6 is connected to a high voltage lead through the lead end 7. The metal sealing canister 2 is sleeved on the outside of the voltage equalization sleeve 6 and the cable end 1. The metal sealing canister 2 is filled with insulating gas 4.

[0037] The lifting device includes a slide table 8, a stepper motor 9, and a clamp 10. The clamp 10 is clamped at the lower part of the metal sealed container 2, and the stepper motor 9 drives the clamp 10 to slide up and down along the slide table 8.

[0038] The metal sealing tank 2 and the equalizing bushing 6 are an integrated structure and can be prefabricated in the factory. The metal sealing tank 2 is used to shield the electric field so that the voltage distribution of the cable end 1 under the voltage of the high voltage lead is consistent with normal operation. The equalizing bushing 6 is used to equalize the voltage applied to the withstand voltage device and prevent surface discharge.

[0039] There are multiple slides 8 and multiple stepper motors 9. Each slide 8 is connected to a corresponding stepper motor 9. The multiple slides 8 are distributed around the gripper 10 and connected to the gripper 10 through the stepper motors 9, which improves the stability of the metal sealing can 2 during the gripping process.

[0040] The device also includes a controller that is connected to each of the stepper motors 9.

[0041] In this embodiment, one side of the equalizing cover 3 is bolted to the upper metal electrode of the cable end 1, and the other end is provided with a mounting hole for connecting the conductive rod 5.

[0042] There are four slides 8 and four stepper motors 9. The four slides 8 are distributed at the four corners of the gripper 10 and are connected to the gripper 10 through the stepper motors 9.

[0043] Cable end 1, voltage equalizing cover 3, conductive rod 5 and voltage equalizing sleeve 6 are distributed sequentially from bottom to top along the same central axis.

[0044] Before use, first fix the cable end 1 in the predetermined position. The clamp 9 of the lifting device is hydraulically clamped at the bottom of the metal sealed container and raised to the top of the cable end 1. Then, the equalizing cover 3 is bolted to the upper metal electrode of the cable end 1. Then, the conductive rod 5 is inserted into the hole in the equalizing cover 3. The controller synchronously controls 4 stepper motors 9 to drive the clamp to slowly descend along the slide table 8 to the cable end until the bottom is sealed. Insulating gas is filled into the cavity formed by the sealed container 2 and the equalizing sleeve 6. A high voltage lead is connected to the lead end 7, and the test can be carried out.

[0045] Example 2

[0046] This embodiment provides a transmission line acceptance test method using equipment as described in Embodiment 1, comprising the following steps:

[0047] S1: Obtain cable end 1 and fix it in the predetermined position;

[0048] S2: The metal sealing container 2 is clamped at the lower part by the clamp 10 of the lifting device, and the stepper motor 9 is controlled to drive the metal sealing container 2 to move to the top of the cable end 1;

[0049] S3: Connect the equalizing cover 3 to the upper metal electrode of the cable end 1 with bolts, and insert the conductive rod 5 into the hole above the equalizing cover 3;

[0050] S4: Control the stepper motor 9 to drive the clamp 10 to descend along the slide table 8 onto the cable end 1 until the metal sealing can 2 seals with the bottom of the cable end 1;

[0051] S5: Insulating gas 4 is filled into the cavity between the sealed container, the equalizing bushing 6 and the cable end 1;

[0052] S6: Connect the high-voltage lead to the lead end 7 of the equalizing bushing 6, turn on the voltage, and conduct the transmission line acceptance test.

[0053] There are multiple slide tables 8 and multiple stepper motors 9. The method synchronously controls each stepper motor 9 to drive the clamp 10 to move the metal sealing can 2 up and down along the slide table 8.

[0054] During the acceptance test of transmission lines, a handover test is conducted for 0.8 to 1.5 hours by applying 1.6 to 1.9 times the operating voltage of the transmission line through the high-voltage lead.

[0055] This solution, together with the lifting device, forms the acceptance equipment that can be assembled without manpower. It can apply 1.7 times the operating voltage of the transmission line for a 1-hour handover test, which shortens the test time and saves time and effort.

[0056] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A device for acceptance testing of transmission lines, used to perform acceptance testing on cable ends (1), characterized in that, The device includes a pressure-resistant device and a lifting device. The pressure-resistant device includes a metal sealing canister (2), a pressure equalizing cover (3), a conductive rod (5), a pressure equalizing sleeve (6), and a lead wire end (7). The pressure equalizing cover (3) is connected to the upper metal electrode of the cable end (1). The conductive rod (5) is connected to the pressure equalizing cover (3) and the pressure equalizing sleeve (6) respectively. The pressure equalizing sleeve (6) is connected to the high-voltage lead wire through the lead wire end (7). The metal sealing canister (2) is sleeved on the outside of the pressure equalizing sleeve (6) and the cable end (1). The metal sealing canister (2) is filled with insulating gas (4). The lifting device includes a slide (8), a stepper motor (9) and a clamp (10). The clamp (10) is clamped on the lower part of the metal sealed container (2). The stepper motor (9) drives the clamp (10) to slide up and down along the slide (8). The metal sealing can (2) and the equalizing bushing (6) are an integrated structure. The metal sealing can (2) is used to shield the electric field so that the power distribution of the cable end (1) under the voltage of the high voltage lead is consistent with normal operation. The equalizing bushing (6) is used to equalize the voltage applied to the withstand voltage device. There are multiple slides (8) and stepper motors (9). Each slide (8) is connected to a corresponding stepper motor (9). Multiple slides (8) are distributed around the gripper (10) and connected to the gripper (10) through stepper motors (9).

2. The equipment for acceptance testing of transmission lines according to claim 1, characterized in that, One side of the equalizing cover (3) is bolted to the upper metal electrode of the cable end (1), and the other end is provided with a mounting hole for connecting the conductive rod (5).

3. The equipment for acceptance testing of transmission lines according to claim 1, characterized in that, The number of slides (8) and stepper motors (9) are four. The four slides (8) are distributed at the four corners of the clamp (10) and connected to the clamp (10) through the stepper motors (9).

4. The equipment for acceptance testing of transmission lines according to claim 1, characterized in that, The device also includes a controller that is connected to each stepper motor (9).

5. The equipment for acceptance testing of transmission lines according to claim 1, characterized in that, The cable end (1), the equalizing cover (3), the conductive rod (5), and the equalizing sleeve (6) are distributed sequentially from bottom to top along the same central axis.

6. A method for accepting and testing transmission lines using equipment as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Obtain the cable end (1) and fix it in the predetermined position; S2: The metal sealing can (2) is clamped at the bottom by the clamp (10) of the lifting device, and the stepper motor (9) is controlled to drive the metal sealing can (2) to move to the top of the cable end (1); S3: Connect the equalizing shield (3) to the upper metal electrode of the cable end (1) by bolts, and insert the conductive rod (5) into the hole above the equalizing shield (3); S4: Control the stepper motor (9) to drive the clamp (10) to descend along the slide (8) onto the cable end (1) until the metal sealing can (2) seals the bottom of the cable end (1); S5: Fill the cavity between the sealed tank, the equalizing bushing (6) and the cable end (1) with insulating gas (4); S6: Connect a high-voltage lead to the lead end (7) of the equalizing bushing (6), turn on the voltage, and conduct a transmission line acceptance test.

7. The method according to claim 6, characterized in that, During the acceptance test of the transmission line, a handover test of 0.8-1.5 hours is conducted by applying 1.6-1.9 times the operating voltage of the transmission line through the high-voltage lead.

8. The method according to claim 6, characterized in that, The slide (8) and stepper motor (9) are both multiple. The method synchronously controls each stepper motor (9) to drive the clamp (10) to move the metal sealing can (2) up and down along the slide (8).

Images