A high voltage switchgear interlocking device

Abstract

The present invention discloses a high-voltage switchgear interlocking device: comprising an interlocking plate driving mechanism, an interlocking plate and an indicating interlocking plate, wherein the interlocking plate driving mechanism is connected to the main shaft of the circuit breaker, the interlocking plate is provided with a baffle, the interlocking plate driving mechanism is used to drive the interlocking plate to slide relative to the main shaft of the circuit breaker, and the indicating interlocking plate is connected to the main shaft of the disconnector; when the disconnector is in a closed state, the indicating interlocking plate blocks the grounding shaft; when the disconnector is in an open state, the indicating interlocking plate is arranged between the disconnector shaft and the grounding shaft; when the disconnector is in a grounding state, the indicating interlocking plate blocks the disconnector shaft; when the main shaft of the circuit breaker is in a closed state, the baffle blocks the disconnector shaft; when the main shaft of the circuit breaker is in an open state, the baffle is separated from the disconnector shaft. The present invention can realize the requirements of "preventing grounding power transmission", "preventing live grounding switch closing" and "preventing load opening and closing of disconnector" in the "five protections" through a very simple mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switchgear, and in particular to an interlocking device for high-voltage switchgear. Background Art

[0002] In order to ensure personal safety during the use of high-voltage switchgear, the national standard requires that all high-voltage switchgear that may cause misoperation be equipped with anti-misoperation devices, that is, they have the "five-protection" function, which is one of the important measures for power safety. The "five protections" are to prevent the circuit breaker from opening and closing by mistake; to prevent the disconnector from opening and closing under load; to prevent the earthing switch from closing under power; to prevent the earthing power supply; and to prevent the mistaken entry into the live interval. In the existing technology, the "five-protection" interlocking structure is diverse, and most of them have the disadvantages of complex structure, inconvenient operation, and low reliability. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a high-voltage switchgear interlocking device, which solves the problems of the prior art that the high-voltage switchgear has a complex structure, is inconvenient to operate, and has low reliability.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A high-voltage switchgear interlocking device, characterized in that it comprises an interlocking plate driving mechanism, an interlocking plate and an indicating interlocking plate, wherein the interlocking plate driving mechanism is connected to a main shaft of a circuit breaker, the interlocking plate is provided with a baffle, the interlocking plate driving mechanism is used to drive the interlocking plate to slide relative to the main shaft of the circuit breaker, and the indicating interlocking plate is connected to the main shaft of the disconnector;

[0006] When the isolation mechanism is in the closed state, the indicating interlocking plate shields the grounding shaft;

[0007] When the isolation mechanism is in the open state, the indicating interlocking plate is arranged between the isolation shaft and the grounding shaft; when the isolation mechanism is in the grounding state, the interlocking plate blocks the isolation shaft;

[0008] When the main shaft of the circuit breaker is in a closed state, the baffle shields the isolation shaft; when the main shaft of the circuit breaker is in an open state, the baffle is separated from the isolation shaft.

[0009] As an optimization scheme of the present invention, the aforementioned interlocking device of a high-voltage switchgear: the interlocking plate driving mechanism is a cam, when the baffle blocks the isolation shaft, the interlocking plate is connected to the larger diameter of the cam, when the baffle is separated from the isolation shaft, the interlocking plate is connected to the smaller diameter of the cam.

[0010] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device: the interlocking plate is connected to the second tension spring, and the second tension spring is used to drive the interlocking plate to fit against the side of the cam.

[0011] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device: the cam connecting end of the interlocking plate is provided with a bent plate, and the bent plate is connected to the side of the cam.

[0012] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device: the interlocking plate is provided with no less than two guide grooves, and the guide grooves are connected to the support columns.

[0013] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device: the indicating interlocking plate is provided with an indicating device for displaying the state of the isolating switch.

[0014] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device: the indicating device is an indicating arc end, and the indicating arc end is provided with an isolating switch indicating symbol.

[0015] As an optimization solution of the present invention, the aforementioned high-voltage switchgear interlocking device also includes a counter, and a trigger end of the counter is connected to the cam.

[0016] The beneficial effects achieved by the present invention are:

[0017] Compared with the prior art, the present invention can meet the requirements of "preventing power supply during grounding", "preventing closing the grounding switch under power" and "preventing opening and closing the isolating switch under load" among the "five protections".

[0018] The invention has a simple structure, and the main components of the whole device only include a cam, an interlocking plate and an indicating interlocking plate. Due to the small number of components, the operation of the invention is relatively simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the circuit breaker closed / isolating switch closed in this embodiment;

[0020] Figure 2 This is a left side view of the circuit breaker closed / isolating switch closed in this embodiment;

[0021] Figure 3 This is a front view of the circuit breaker opening / isolating switch closing of this embodiment;

[0022] Figure 4 This is a front view of the circuit breaker / isolating switch of this embodiment (installed state);

[0023] Figure 5 is a front view of the grounding / isolation of the circuit breaker of this embodiment;

[0024] The meaning of the accompanying numbers: 1-mechanism front plate; 2-circuit breaker main shaft; 3-cam; 4-interlocking plate; 4.1-guide groove; 4.3-baffle; 4.4-bend plate; 5-support column; 7-tension spring one; 8-tension spring two; 9-isolating shaft; 10-isolating switch main shaft; 11-indicating interlocking plate; 11.1-indicating arc end; 12-grounding shaft; 13.1-isolating switch; 13.2-isolating mechanism; 14.1-circuit breaker; 14.2-circuit breaker mechanism; 15-isolating switch indication window; 16-counter. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] In the prior art, the circuit breaker 14.1, the circuit breaker mechanism 14.2, the isolating switch 13.1 and the isolating mechanism 13.2 are usually used in combination. The circuit breaker 14.1 has a built-in arc extinguishing chamber and can usually be operated to open and close with load, while the isolating switch 13.1 has no arc extinguishing device and cannot be operated to open and close with load. The isolating switch 13.1 also has a grounding function and is usually used during maintenance.

[0027] The main circuit operation of the disconnector 13.1 is achieved by rotating the disconnector shaft 9 to drive the disconnector main shaft 10, and the grounding operation is achieved by rotating the grounding shaft 12 to drive the disconnector main shaft 10. In actual application, the disconnector main shaft 10 and the circuit breaker main shaft 2 are preferably arranged in parallel and passed through a mechanism front plate 1 for use. A certain interlocking mechanism is arranged on the mechanism front plate 1 to avoid misoperation of the disconnector mechanism 13.2 and the circuit breaker mechanism 14.2.

[0028] like Figures 1 to 5 As shown: This embodiment discloses a high-voltage switchgear interlocking device, including an interlocking plate driving mechanism, an interlocking plate 4 and an indicating interlocking plate 11, the interlocking plate driving mechanism is connected to the circuit breaker main shaft 2, the interlocking plate 4 is provided with a baffle 4.3, the interlocking plate driving mechanism is used to drive the interlocking plate 4 to slide relative to the circuit breaker main shaft 2, at least two guide grooves 4.1 can be set on the interlocking plate 4, and a support column 5 is set on the front plate 1 of the mechanism, one end of the support column 5 is a large column and the other end is a small column, the small cylindrical end passes through the guide long groove 4.1 and fixes the interlocking plate 4 through a fastener (such as a baffle, a pin or a nut), so that the interlocking plate 4 slides relative to the circuit breaker main shaft 2.

[0029] The indicating interlocking plate 11 is connected to the isolating switch main shaft 10 and rotates synchronously with the isolating switch main shaft 10 .

[0030] The interlocking plate driving mechanism of this embodiment is a cam 3. When the baffle 4.3 blocks the isolation shaft 9, the interlocking plate 4 is connected to the larger diameter of the cam 3 ( Figure 1 ), when the baffle 4.3 is separated from the isolation shaft 9, the interlocking plate 4 is connected to the smaller diameter of the cam 3 ( Figure 3 , Figure 4 , Figure 5 ). In order to increase the contact area between the interlocking plate 4 and the cam 3 (because the thickness of the interlocking plate 4 is not large), in this embodiment, it is best to provide a bent plate 4.4 at the cam 3 connection end of the interlocking plate 4, and the bent plate 4.4 is connected to the side of the cam 3. When the cam 3 rotates, it is necessary to ensure that the interlocking plate 4 follows, that is, to ensure that the bent plate 4.4 is always in contact with the side of the cam 3. Therefore, the interlocking plate 4 is connected to the tension spring 2 8, and the tension spring 2 8 is used to drive the interlocking plate 4 to fit the side of the cam 3. One end of the tension spring 2 8 hooks the interlocking plate 4, and the other end can be connected to one of the support columns 5.

[0031] The indicating interlocking plate 11 is provided with an indicating arc end 11.1 for displaying the state of the isolating switch. The indicating arc end 11.1 is provided with words or symbols of "closed", "opened" and "grounded", which are respectively used to indicate the closed, open and grounded states. The high-voltage switchgear is provided with a panel to cover the circuit breaker mechanism 14.2, the isolating mechanism 13.2 and the interlocking device. The panel is provided with an isolating switch indicating window 15, which is transparent and visible. The state of the current isolating switch 13.1 can be observed through the isolating switch indicating window. When the isolating switch 13.1 is in the closed state, the isolating switch indicating window 15 is aligned with the word "closed" on the indicating arc end 11.1. Similarly, when in the other two states, the corresponding words can only be observed through the switch indicating window 15.

[0032] This embodiment also includes a counter 16, the trigger end of the counter 16 is connected to the cam 3, and the two can be connected by a tension spring 7. When the cam 3 rotates, the counter 16 can be triggered by the tension spring 7 to count the number of times the circuit breaker 14.1 works.

[0033] like Figure 1 and Figure 2 As shown: when the circuit breaker 14.1 and the disconnector 13.1 are both in the closed state, in this state: it is necessary to prevent the disconnector 13.1 from being separated with load, and it is also necessary to prevent the grounding operation. In this state, the baffle 4.3 blocks the isolation shaft 9, and the operator cannot operate the isolation mechanism 13.2; at the same time, the indicating interlock plate 11 blocks the grounding shaft 12, and the operator cannot operate the grounding shaft 12. The "five preventions" of "preventing the disconnector from being separated and closed with load" and "preventing the grounding switch from being closed with power" are realized.

[0034] like Figure 3As shown: when the circuit breaker 14.1 is in the open state and the disconnector 13.1 is in the closed state, in this state: the baffle 4.3 is separated from the disconnector shaft 9, that is, it does not block the disconnector shaft 9, and the disconnection operation of the disconnector mechanism 13.2 can be performed; furthermore, the indicating interlock plate 11 blocks the grounding shaft 12, and the grounding operation cannot be performed, thereby realizing the "prevention of closing the grounding switch under power" in the "five protections".

[0035] It can be seen from the above description that when the isolation mechanism 13.2 is in the closed state, no matter what state the circuit breaker 14.1 is in, the grounding operation cannot be performed.

[0036] When the isolation mechanism 13.2 is in the grounded state, it is usually in the maintenance state. At this time, the line cannot be closed and energized. Figure 5 As shown: in this state, the circuit breaker 14.1 is in the open state. Although the baffle 4.3 and the isolating shaft 9 are in the separated state, the indicating interlock plate 11 blocks the isolating shaft 9, so the isolating shaft 9 cannot be operated, and the isolating mechanism 13.2 cannot be closed, realizing the "prevention of grounding power supply" in the "five protections".

[0037] This embodiment also discloses a method for installing the above-mentioned high-voltage switchgear interlocking device, such as Figure 4 As shown: when the isolation mechanism 13.2 and the circuit breaker mechanism 14.2 are both in the open state, the installation is performed. First, the cam 3 is installed on the circuit breaker main shaft 2, and then the interlocking plate 4 is installed on the support column 5 through the guide groove 4.1. The interlocking plate 4 is fixed by a stopper, a pin or a nut so that it can slide relative to the cam 3, and then the tension spring 8 is hung. Finally, the interlocking plate 11 is installed on the disconnector main shaft 10. Since the isolation mechanism 13.2 is in the open state at this time, when installing the interlocking plate 11, the disconnector indicator window 15 should be aligned with the word "open".

[0038] Compared with the prior art, this embodiment simplifies the structure under the premise of realizing the "five protections" of "preventing power supply during grounding", "preventing closing the grounding switch under power" and "preventing opening and closing the isolating switch under load". Due to the simplified structure, its reliability and stability are improved, and it is helpful to reduce the failure rate.

[0039] The present embodiment has a simple structure, and the main components of the whole device only include the cam 3, the interlocking plate 4 and the indicating interlocking plate 11. Due to the small number of components, the operation of the present embodiment is relatively simple and easy to use.

[0040] 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 modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high voltage switchgear interlocking device, characterized in that: The invention comprises an interlocking plate driving mechanism, an interlocking plate (4) and an indicating interlocking plate (11), wherein the interlocking plate driving mechanism is connected to a circuit breaker main shaft (2), the interlocking plate (4) is provided with a baffle (4.3), the interlocking plate driving mechanism is used to drive the interlocking plate (4) to slide relative to the circuit breaker main shaft (2), and the indicating interlocking plate (11) is connected to the disconnector main shaft (10); When the isolation mechanism (13.2) is in a closed state, no matter what state the circuit breaker (14.1) is in, the indicating interlocking plate (11) blocks the grounding shaft (12), and no grounding operation can be performed; When the isolation mechanism (13.2) is in an open state, the indicating interlock plate (11) is arranged between the isolation shaft (9) and the grounding shaft (12); When the isolation mechanism (13.2) is in a grounded state, the circuit breaker (14.1) is in an open state, the baffle (4.3) and the isolation shaft (9) are in a separated state, the indicating interlocking plate (11) blocks the isolation shaft (9), the isolation shaft (9) cannot be operated, and the isolation mechanism (13.2) cannot be closed; When the circuit breaker (14.1) and the isolating switch (13.1) are both in the closed state, the baffle (4.3) blocks the isolating shaft (9), and the operator cannot operate the isolating mechanism (13.2); when the circuit breaker (14.1) is in the open state and the isolating switch (13.1) is in the closed state, the baffle (4.3) is separated from the isolating shaft (9) and does not block the isolating shaft (9), so the isolating mechanism (13.2) can be opened.

2. A high-voltage switchgear interlocking device according to claim 1, characterized in that: The interlocking plate driving mechanism is a cam (3); when the baffle plate (4.3) blocks the isolation shaft (9), the interlocking plate (4) is connected to a portion of the cam (3) with a larger diameter; when the baffle plate (4.3) is separated from the isolation shaft (9), the interlocking plate (4) is connected to a portion of the cam (3) with a smaller diameter.

3. A high-voltage switchgear interlocking device according to claim 2, characterized in that: The interlocking plate (4) is connected to a second tension spring (8), and the second tension spring (8) is used to drive the interlocking plate (4) to fit against the side of the cam (3).

4. A high-voltage switchgear interlocking device according to claim 2 or 3, characterized in that: A bent plate (4.4) is provided at the connection end of the cam (3) of the interlocking plate (4), and the bent plate (4.4) is connected to the side of the cam (3).

5. A high-voltage switchgear interlocking device according to claim 1, characterized in that: The interlocking plate (4) is provided with no less than two guide grooves (4.1), and the guide grooves (4.1) are connected to the support column (5).

6. A high voltage switchgear interlocking device according to claim 1, characterized in that: The indicating interlocking plate (11) is provided with an indicating device for displaying the state of the isolating switch.

7. A high-voltage switchgear interlocking device according to claim 6, characterized in that: The indicating device is an indicating arc end (11.1), and the indicating arc end (11.1) is provided with an isolating switch indicating symbol.

8. A high voltage switchgear interlocking device according to claim 1, characterized in that: It also includes a counter (16), wherein a trigger end of the counter (16) is connected to the cam (3).

Images