Method for replacing the disconnector operating device

Abstract

To provide a replacement method for disconnector handling device, capable of running an operation confirmation test under actual use state after replacement of a handling device and shortening operation time including operation confirmation test.SOLUTION: A replacement method for disconnector handling device includes: a temporary fixing process which temporalily fix an operation rod 19b connected to a handling device 20b of a disconnector 10d and an arbitrary structure 50 using an operation rod fixing fixture 100; a regular fixing process which conducts temporary fixing by disconnecting a connection part of the operation rod 19b and the handling device 20b and separating the operation rod 19b from the handling device 20b; and a replacement process which conducts replacing the handling device 20b.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for replacing an operating device of a circuit breaker.

Background Art

[0002] In substation electrical equipment, various devices such as circuit breakers, disconnectors, and transformers are installed. A circuit breaker is a type of switch for opening and closing electricity and operates in a state where no current is flowing. A circuit breaker is connected to an operating rod in a circuit breaker operating device equipped with a motor, and the circuit is opened and closed by rotating a blade provided on the operating rod (Patent Documents 1 and 2).

[0003] For the maintenance of substation electrical equipment, etc., regular inspections and replacements of the equipment are carried out, and the operating device of the circuit breaker may also be replaced.

[0004] Since a circuit breaker operates in a state where no current is flowing, first, the disconnector is opened to make the state where no electricity is flowing, and then the circuit breaker is opened, and the operating device is replaced in a state where it is disconnected from the circuit. Therefore, in the method for replacing the operating device in a substation with a double-busbar system, the operating device of the circuit breaker was replaced by power-off for each busbar.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In previous methods for replacing disconnector operating devices, the pallet contact verification test and interlock test after replacement required simulating the conditions by short-circuiting and opening the pallet contacts of the disconnector on the opposing busbar side. This did not involve testing with actual pallet contacts, and therefore reliability could not always be guaranteed.

[0007] Furthermore, during the installation process for replacing the control devices, the power busbar had to be switched, which required simulating the conditions by short-circuiting and opening the pallet contacts of the newly installed control devices. This resulted in a complex and increased number of test items, leading to longer working times.

[0008] The present invention has been made in view of the above matters, and its purpose is to provide a method for replacing the operating device of a disconnector that allows for operational verification tests in actual use conditions after the replacement of the operating device, and that can shorten the work time, including operational verification tests. [Means for solving the problem]

[0010] Honpatsu Clearly The method for replacing the operating device of the disconnector is as follows: A method for replacing the operating device of a disconnector in a dual busbar system, With the first busbar energized and the second busbar de-energized, the first operating rod, which is connected to the first operating device of the first disconnector located on the first busbar side, is temporarily fixed to an arbitrary structure using an operating rod fixing jig. The process involves disconnecting the connection between the first operating rod and the first operating device, and permanently fixing the first operating rod away from the first operating device, The process of replacing the first operating device, The process includes the steps of disconnecting the connection between the second operating device and the second operating rod of the second disconnector located on the second busbar side, and replacing the second operating device. It is characterized by the following:

[0011] Furthermore, it is preferable to use the operating rod fixing jig having a connecting rod, an operating rod fixing part disposed on one side of the connecting rod and fixed to the operating rod, and a structure fixing part disposed on the other side of the connecting rod and fixed to the structure.

[0012] Furthermore, it is preferable to use the operating rod fixing jig in which the operating rod fixing portion is configured to be slidable relative to the connecting rod. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a method for replacing the operating device of a disconnector that allows for operational verification tests under actual usage conditions after the replacement of the operating device, and that can shorten the work time, including operational verification tests. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing the schematic configuration of a disconnector. [Figure 2] This diagram shows the procedure for replacing the operating device. [Figure 3] Figure 3(A) is a front view of the operating rod fixing jig, and Figure 3(B) is a side view of Figure 3(A) in the Y direction. [Figure 4] This diagram shows the procedure for replacing the operating device. [Figure 5] This diagram shows the procedure for replacing the operating device. [Figure 6] This diagram shows the procedure for replacing the operating device. [Modes for carrying out the invention]

[0015] A method for replacing the operating device of the disconnector according to this embodiment will be described with reference to the diagram.

[0016] Fig. 1 shows a schematic configuration of a circuit breaker with a double busbar system having a three-phase AC main busbar A and main busbar B. Three breaking parts 10a - 10c are installed on the side of main busbar A 41a - 41c, and three breaking parts 10d - 10f are installed on the side of main busbar B 42a - 42c on the base 30. These breaking parts 10a - 10f adopt the horizontal single-break method and have the same configuration respectively.

[0017] Operating devices 20a and 20b are installed on the side of main busbar A 41a - 41c and the side of main busbar B 42a - 42c respectively. The operating devices 20a and 20b are equipped with a motor, a reduction mechanism, etc., and rotate the connected operating rods 19a and 19b. By rotating the operating rods 19a and 19b forward and backward, the breaking parts 10a - 10f can be set to the open state and the closed state.

[0018] Specifically, the operating rod 19a is connected to the insulator support 11a, and the insulator support 11a rotates due to the rotation of the operating rod 19a. The insulator support 11a and the insulator support 11b are connected by links 15a, 15b, and 16 at the lower part. When the insulator support 11a rotates clockwise, the insulator support 11b rotates counterclockwise. Since blades 13a and 13b having contactors 14a and 14b respectively are arranged on the upper parts of the insulator supports 11a and 11b, when the insulator supports 11a and 11b rotate as described above, the blades 13a and 13b also rotate in the same way, and the contactor 14b is press-fitted into the contactor 14a, resulting in the closed state. Conversely, when the operating rod 19a rotates so that the insulator support 11a rotates counterclockwise, the press-fitting between the contactors 14a and 14b is released, resulting in the open state.

[0019] In addition, the insulator support 11a and the insulator support 11c are connected by a connecting rod 18a, and the insulator support 11c and the insulator support 11e are connected by a connecting rod 18b. Therefore, when the insulator support 11a rotates, the insulator supports 11c and 11e also rotate in the same way. And due to the same link mechanism as described above, the insulator supports 11d and 11f also rotate. So, by rotating the operating rod 19a, each of the breaking parts 10a - 10c synchronously becomes the open state and the closed state.

[0020] The above describes the operation of the disconnection sections 10a to 10c on the A busbar 41a to 41c side, but the operation of the disconnection sections 10d to 10f on the B busbar 42a to 42c side is similar. In Figure 1, the disconnection sections 10a to 10c on the A busbar 41a to 41c side are in an open state, indicating that no current flows from the A busbar 41a to 41c to the transmission lines 43a to 43c. On the other hand, the disconnection sections 10d to 10f on the B busbar 42a to 42c side are in a closed state, indicating that current flows from the B busbar 42a to 42c to the transmission lines 43a to 43c.

[0021] Next, we will explain in detail the procedure for replacing the disconnector's operating device.

[0022] First, with the power outage on busbars A 41a to 41c and the power on busbars B 42a to 42c, the operating rods 19b of the disconnection sections 10d to 10f on busbar B 42a to 42c and the surrounding structures 50 are temporarily fixed together, as shown in Figure 2. Any structure 50 can be used as the structure 50 to be fixed together, such as a nearby steel post or frame 31.

[0023] For fixing the operating rod 19b to the structure 50, for example, an operating rod fixing jig 100 as shown in Figures 3(A) and (B) can be used. This operating rod fixing jig 100 comprises a connecting rod 101, an operating rod fixing part 102, a structure fixing part 103, and a sliding part 104.

[0024] The connecting rod 101 is a long, rod-shaped body such as a steel pipe. An operating rod fixing part 102, which is fixed to the operating rod 19b, is provided on one end of the connecting rod 101.

[0025] Furthermore, a structural fixing part 103 is provided on the other end of the connecting rod 101, which is fixed to the structure 50 via a sliding part 104. In this case, a catch clamp is provided as the structural fixing part 103, but any form that can be appropriately fixed according to the shape of the structure 50 to be fixed is acceptable.

[0026] The sliding part 104 allows adjustment of the length of the operating rod fixing jig 100, specifically the length between the operating rod fixing part 102 and the structure fixing part 103. Here, the sliding part 104 is made of channel steel combined with a U-bolt and a nut. The sliding part 104 is slid relative to the connecting rod 101 inserted into the U-bolt to adjust the overall length of the operating rod fixing jig 100, and then fixed with the nut. In addition to the above, the operating rod fixing part 102 can take any form as long as it can be fixed to the operating rod 19b. Here, a U-bolt is used as the operating rod fixing part 102, but in cases where the operating rod 19b is a square rod, a U-bolt or an angle-processed part may be used, or any form that can be fixed to the operating rod 19b according to the shape of the operating rod 19b.

[0027] As will be described later, when the operating rod 19b is moved away from the operating device 20b after being temporarily fixed to it, the operating rod 19b moves. Since the operating rod fixing jig 100 has a sliding part 104, the distance between the operating rod fixing part 102 and the structure fixing part 103 can be adjusted according to the amount of movement of the operating rod 19b, and after adjustment, it can be permanently fixed.

[0028] Next, the connection between the operating rod 19b and the operating device 20b is disconnected, and the lower end of the operating rod 19b is moved to a position that does not interfere with the replacement of the operating device 20b, as shown in Figure 4. At the same time, the sliding part 104 is slid relative to the connecting rod 101 in accordance with the movement of the operating rod 19b, and the distance between the operating rod fixing part 102 and the structure fixing part 103 is adjusted. Finally, the operating rod fixing part 102 is permanently fixed in place.

[0029] With the operating rod 19b fixed by the operating rod fixing jig 100, the connection between the operating rod 19a on the busbar 41a-41c side and the operating device 20a is disconnected.

[0030] Then, as shown in Figure 5, the existing operating devices 20a and 20b are replaced with new operating devices 20a' and 20b', respectively. The operating rod 19a is also removed and replaced with a new operating rod 19a'.

[0031] In this state, various operational verification tests are performed, such as interlock tests of the disconnection sections 10a to 10c on the busbar 41a to 41c side and pallet contact operation verification tests.

[0032] Next, after energizing busbars A-41a-41c and de-energizing busbars B-42a-42c, the operating rod 19b is removed, and a new operating rod 19b' is installed as shown in Figure 6 and connected to the operating device 20b'.

[0033] Subsequently, various operational verification tests are performed on the operating device 20b on the busbar 42a-42c side, as well as on the disconnection sections 10d-10f.

[0034] Thus, in the method for replacing the disconnector operating device according to this embodiment, even when the buses 42a to 42c are energized, the operating rod 19b can be disconnected from the operating device 20b, rendering the operating rod 19b immobile. Therefore, it is possible to replace not only the operating device 20a but also the operating device 20b together.

[0035] Furthermore, with the B busbars 42a to 42c energized, an operational verification test can be performed on the disconnection sections 10a to 10c on the A busbar 41a to 41c side using the replaced operating device 20a'. Similarly, with the A busbars 41a to 41c energized, an operational verification test can be performed on the disconnection sections 10d to 10f on the B busbar 42a to 42c side using the replaced operating device 20b'. Therefore, since the operational verification test can be performed under conditions similar to those of actual operation of the disconnection sections 10a to 10f, reliability is also ensured.

[0036] Furthermore, this also leads to a reduction in the total working time, including operational verification, thus shortening the power outage time and contributing to a decrease in construction costs.

[0037] Although the above explanation used a single-point horizontal disconnector as an example, the method is also applicable to two-point disconnectors. [Explanation of symbols]

[0038] 10a~10f Disconnection section 11a~11f Insulator supports 12a, 12b terminal block 13a, 13b blades 14a, 14b Contactor 15a, 15b Links 16 links 17 links 18a, 18b connecting rod 19a, 19b Operating rods 19a', 19b' Operating rods 20a, 20b operating device 20a', 20b' operating device 30 base 31. Stand 41a~41c K bus line 42a~42c Otsu bus line 43a~43c transmission lines 50 Structures 100 Operating rod fixing jig 101 Connection 102 Operating rod fixing part 103 Structure fixing part 104 Slide section

Claims

1. A method for replacing the operating device of a disconnector in a dual busbar system, With the first busbar energized and the second busbar de-energized, the first operating rod, which is connected to the first operating device of the first disconnector located on the first busbar side, is temporarily fixed to an arbitrary structure using an operating rod fixing jig. The process involves disconnecting the connection between the first operating rod and the first operating device, and permanently fixing the first operating rod away from the first operating device, The process of replacing the first operating device, The process includes the steps of disconnecting the connection between the second operating device and the second operating rod of the second disconnector located on the second busbar side, and replacing the second operating device. A method for replacing the operating device of a disconnector, characterized by the above.

2. The operating rod fixing jig is used, which has a connecting rod, an operating rod fixing part disposed on one side of the connecting rod and fixed to the operating rod, and a structure fixing part disposed on the other side of the connecting rod and fixed to the structure. A method for replacing the operating device of a disconnector according to claim 1.

3. The operating rod fixing jig is used, in which the operating rod fixing portion is configured to be slidable relative to the connecting rod. A method for replacing the operating device of a disconnector according to feature 2.

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