Generator circuit breaker isolation switch operating mechanism and control system

Abstract

The invention relates to the technical field of operating switches, in particular to a generator circuit breaker disconnecting switch operating mechanism and control system, comprising: a cam wheel body, the lower end face of which is connected with a turbine of the operating mechanism for rotation; the convex blocks comprise a first convex block arranged on the side circumferential surface of the cam body and a second convex block arranged on the side circumferential surface of the cam body and connected with the first convex block, and step grooves are formed in the end faces, away from each other, of the first convex block and the second convex block and used for sequentially pressing a plurality of travel switches of the operating mechanism under rotation of the cam body. The change amount of original equipment is small, only the cam is transformed, and the contactor and the time relay are replaced, so that the operation is simple, and the field change workload is small; a control system, a clutch module and a motor power supply loop in a generator circuit breaker isolation switch control system can be effectively optimized, and the situation that a travel switch S5 / S6 directly cuts off large inductive current is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of operating switch technology, and in particular to an operating mechanism and control system for a generator circuit breaker disconnect switch. Background Technology

[0002] The generator circuit breaker disconnector control system comprises limit switches, limit switch switching cams, a control system, a clutch module, and a motor power supply circuit. The generator circuit breaker disconnector operating mechanism's switching cam simultaneously disconnects limit switches (S1 / S2) and (S5 / S6). The auxiliary contacts of limit switches (S5 / S6) actuate earlier than the auxiliary contacts of the contactor, thus directly disengaging the clutch module. The clutch acts like an electromagnetic coil with relatively large inductance. This means that the limit switches (S5 / S6) directly interrupt a large inductive current, causing arcing in the S5 / S6 limit switches. Since the capacity of the S5 / S6 limit switches is insufficient to disengage the clutch module, repeated disconnections result in carbonization and erosion of the moving and stationary contacts, increasing contact resistance and ultimately causing poor contact in the S5 / S6 limit switches, leading to unsuccessful opening and closing of the circuit breaker.

[0003] When the generator circuit breaker disconnector switch operating mechanism switches the cam, arcing occurs in the S5 / S6 limit switches. This arcing also occurs in the control system when the cam is switched, causing circuit failure and preventing the circuit from maintaining stability. Summary of the Invention

[0004] In view of the technical problem that the existing generator circuit breaker disconnector operating mechanism has arcing phenomenon of S5 / S6 limit switches when switching cam, the first technical solution of the present invention is proposed.

[0005] This invention provides an operating mechanism for a generator circuit breaker disconnect switch, the purpose of which is to solve the technical problem of arcing in the S5 / S6 limit switches when switching the cam.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a generator circuit breaker disconnector operating mechanism, which includes a cam wheel body, the lower end face of which is connected to a turbine of the operating mechanism for rotation.

[0007] The protrusion includes a first protrusion disposed on the side circumferential surface of the cam wheel body, and a second protrusion disposed on the side circumferential surface of the cam wheel body and connected to the first protrusion. The end faces of the first protrusion and the second protrusion that are far apart from each other are provided with stepped grooves for pressing multiple limit switches of the operating mechanism in sequence under the rotation of the cam wheel body.

[0008] In a preferred embodiment of the generator circuit breaker disconnector operating mechanism of the present invention, the end face of the first protrusion away from the second protrusion forms a switch pressing surface S1 and a switch pressing surface S5, the switch pressing surface S1 is located below the switch pressing surface S5, and the switch pressing surface S1 is located on the side of the switch pressing surface S5 away from the second protrusion.

[0009] In a preferred embodiment of the generator circuit breaker disconnector operating mechanism of the present invention, the end face of the second protrusion away from the first protrusion forms an S2 switch pressing surface and an S6 switch pressing surface, the S2 switch pressing surface is located below the S6 switch pressing surface, and the S2 switch pressing surface is located on the side of the S6 switch pressing surface away from the first protrusion.

[0010] In a preferred embodiment of the generator circuit breaker disconnector operating mechanism of the present invention, the S1 switch pressing surface, the S5 switch pressing surface, the S2 switch pressing surface, and the S6 switch pressing surface are all inclined surfaces.

[0011] The beneficial effects of the generator circuit breaker disconnector operating mechanism of the present invention are: the amount of modification required to the original equipment is small, only the cam needs to be modified and the contactor and time relay need to be replaced, the operation is simple and the amount of on-site modification work is small.

[0012] It can effectively optimize the control system, clutch module and motor power circuit in the generator circuit breaker disconnector control system, effectively avoid the large inductive current directly interrupted by the limit switches S5 / S6, which would cause arcing in the limit switches S5 / S6. Furthermore, the capacity of the limit switches S5 / S6 is insufficient to disconnect the clutch module. After repeatedly disconnecting the clutch module, the moving and stationary contacts are burned and carbonized, resulting in increased contact resistance. Ultimately, this causes poor contact of the limit switches S5 / S6, leading to unsuccessful opening and closing.

[0013] Another objective of this invention is to provide a control system that addresses the technical problem of arcing in the S5 / S6 limit switches during cam operation, leading to circuit failure and instability.

[0014] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a control system, which includes a generator circuit breaker disconnecting switch operating mechanism; and a time relay for cutting off the circuit according to a time setting.

[0015] The clutch module is used to receive the tripping command and control the clutch module to first energize and engage the clutch.

[0016] The closing circuit module is connected in series with the time relay and is used to control the opening contactor of the system to be energized and self-holding, so that the mechanism can start the opening operation.

[0017] The tripping circuit module, which is connected in series with the time relay, is used to control the closing contactor of the system to be energized and self-holding, so that the mechanism can start the closing operation.

[0018] As a preferred embodiment of the control system of the present invention, the clutch module includes a clutch, a closing module connected in series with the clutch, and a discharging module connected in parallel with the closing module and connected in series with the clutch.

[0019] In a preferred embodiment of the control system of the present invention, the closing circuit module includes a first closing circuit submodule and a second closing circuit submodule, wherein the first closing circuit submodule, the time relay and the second closing circuit submodule are connected in series.

[0020] In a preferred embodiment of the control system of the present invention, the tripping circuit module includes a first tripping sub-circuit sub-module connected in parallel with the first closing circuit sub-module, and a second tripping sub-circuit sub-module connected in parallel with the second closing circuit sub-module, wherein the first tripping sub-circuit sub-module, the time relay, and the second tripping circuit sub-module are connected in series.

[0021] In a preferred embodiment of the control system of the present invention, the second closing circuit submodule includes an S1 switch pressing surface, and the wires of the S1 switch pressing surface are connected to the time relay.

[0022] In a preferred embodiment of the control system of the present invention, the second tripping sub-circuit sub-module includes an S2 switch pressing surface, and the wire of the S2 switch pressing surface is connected to the time relay.

[0023] The beneficial effects of the control system of the present invention are as follows: it can effectively optimize the control system, clutch module and motor power circuit in the generator circuit breaker disconnector control system, effectively avoid the direct interruption of large inductive current by limit switches S5 / S6, which would cause arcing in the limit switches S5 / S6. Since the capacity of limit switches S5 / S6 is insufficient to disconnect the clutch module, after multiple disconnections of the clutch module, the moving and stationary contacts are burned and carbonized, resulting in increased contact resistance, ultimately causing poor contact of limit switches S5 / S6 and unsuccessful opening and closing, thus improving the stability of the circuit. By selecting the main contacts of the first four-pole contactor and the main contacts 8 / 9 of the second four-pole contactor, the stability of the circuit contact terminal capability can be improved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the installation structure of the generator circuit breaker disconnector operating mechanism in this invention.

[0025] Figure 2 This is a schematic diagram of the original structure of the generator circuit breaker disconnector operating mechanism before its improvement.

[0026] Figure 3 This is a schematic diagram of the structure of the generator circuit breaker disconnector operating mechanism in this invention. Figure 1 .

[0027] Figure 4 This is a schematic diagram of the structure of the generator circuit breaker disconnector operating mechanism in this invention. Figure 2 .

[0028] Figure 5 This is a schematic diagram of the control system in this invention.

[0029] Figure 6 This is a schematic diagram of the structure of the second closing circuit submodule and the second opening circuit submodule in the control system of the present invention.

[0030] Figure 7 This is a schematic diagram of the clutch module in the control system of the present invention.

[0031] Figure 8 This refers to the operating signal circuit for the spacer / ground switch in the control system of this invention.

[0032] In the diagram: 1. Cam wheel body; 2. Protrusion; 21. First protrusion; 211. S1 switch pressing surface; 212. S5 switch pressing surface; 22. Second protrusion; 221. S2 switch pressing surface; 222. S6 switch pressing surface; 3. Step groove; 4. Time relay; 5. Clutch module; 51. Clutch; 52. Closing module; 521. S5 switch; 522. Main contact of the first four-pole contactor; 523. Closing relay; 53. Opening module; 531. S6 switch; 532. Opening relay; 533. Main contact of the second four-pole contactor; 6. First closing circuit sub-module; 7. Second closing circuit sub-module; 71. S1 switch; 8. First opening sub-circuit sub-module; 9. Second opening sub-circuit sub-module; 91. S2 switch.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example 1 Reference Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a generator circuit breaker disconnector operating mechanism, including a cam wheel body 1. The lower end face of the cam wheel body 1 is connected to a turbine of the operating mechanism for rotation.

[0037] The protrusion 2 includes a first protrusion 21 disposed on the side circumferential surface of the cam wheel body 1, and a second protrusion 22 disposed on the side circumferential surface of the cam wheel body 1 and connected to the first protrusion 21. Both the first protrusion 21 and the second protrusion 22 have stepped grooves 3 on their mutually distant end faces, used to press multiple limit switches of the operating mechanism sequentially as the cam wheel body 1 rotates. The turbine of the operating mechanism drives the cam wheel body 1 to rotate. As the cam wheel body 1 rotates, the protrusion 2 can press the limit switches sequentially, avoiding direct interruption of a large inductive current, which could cause arcing in the limit switches. Furthermore, the capacity of the S5 / S6 limit switches is insufficient to disconnect the clutch module. After repeated disconnections of the clutch module, the moving and stationary contacts are abraded and carbonized, increasing the contact resistance, ultimately causing poor contact of the S5 / S6 limit switches and resulting in unsuccessful opening and closing. The modifications to the original equipment are minimal, only requiring modification of the cam and replacement of the contactor and time relay. The operation is simple, and the on-site modification workload is small.

[0038] Preferably, the end face of the first protrusion 21 away from the second protrusion 22 forms an S1 switch pressing surface 211 and an S5 switch pressing surface 212. The S1 switch pressing surface 211 is located below the S5 switch pressing surface 212, and the S1 switch pressing surface 211 is located on the side of the S5 switch pressing surface 212 away from the second protrusion 22. The stepped groove 3 is located above the first protrusion 21 and the second protrusion 22. Because two end faces relative to the second protrusion 22 are formed on the side of the first protrusion 21, and two end faces relative to the first protrusion 21 are also formed on the side of the second protrusion 22, it is possible to achieve staggered pressing of the S1 switch and the S5 switch, and ensure that the S1 switch is pressed before the S5 switch. Furthermore, the end face of the second protrusion 22 away from the first protrusion 21 forms an S2 switch pressing surface 221 and an S6 switch pressing surface 222. The S2 switch pressing surface 221 is located below the S6 switch pressing surface 222, and the S2 switch pressing surface 221 is located on the side of the S6 switch pressing surface 222 away from the first protrusion 21. S5 and S6 no longer participate in disconnecting the clutch module immediately. Their main function is to prevent overshoot operation. That is, during normal opening and closing operations, the lower layer S1 / S2 can be switched to disconnect all control systems. In this application, S5 / S6 may not be switched when S1 / S2 is switched. They only disconnect the clutch module to protect the body after the switch body has overtraveled.

[0039] Preferably, the pressing surfaces 211, 212, 221, and 222 of switches S1, S5, S2, and S6 are all inclined surfaces. This inclined surface design allows for smooth pressing of the limit switch. The inclined surface transforms the pressing action of the limit switch from an "instantaneous impact" to a "gradual contact": on the one hand, it avoids mechanical fatigue (such as contact deformation or spring failure) caused by excessive instantaneous force on the switch contacts, extending the service life of the limit switch; on the other hand, the inclination angle of the inclined surface allows for precise control of the switch's "pressing stroke" (such as pressing depth and contact time), preventing damage to the internal insulating components of the switch from overvoltage, and is particularly suitable for the tolerance characteristics of small-capacity limit switches.

[0040] During use: The modifications to the original equipment are minimal, requiring only cam modification and replacement of contactors and time relays. Operation is simple, and on-site modifications are minimal. It can effectively optimize the control system, clutch module, and motor power circuit in the generator circuit breaker disconnector control system, effectively preventing the limit switches S5 / S6 from directly interrupting large inductive currents, which would cause arcing in the S5 / S6 limit switches. Furthermore, the capacity of the S5 / S6 limit switches is insufficient to disconnect the clutch module. After repeated disconnections of the clutch module, the moving and stationary contacts are burned and carbonized, resulting in increased contact resistance. Ultimately, this leads to poor contact of the S5 / S6 limit switches, causing unsuccessful opening and closing.

[0041] Example 2 Reference Figures 4-7 This is a second embodiment of the present invention, which further provides a control system including the generator circuit breaker disconnector operating mechanism of the above embodiment, and also includes... Time relay 4 is used to cut off the circuit according to the time setting.

[0042] Clutch module 5 is used to receive the tripping command and control the clutch module to first energize and engage the clutch.

[0043] The closing circuit module is connected in series with the time relay 4 to control the self-holding of the opening contactor of the control system, and the mechanism starts to perform the opening operation.

[0044] The tripping circuit module is connected in series with the time relay 4 to control the closing contactor of the system to be energized and self-holding, and the mechanism starts to perform the closing operation.

[0045] Furthermore, the clutch module 5 includes a clutch 51, a closing module 52 connected in series with the clutch 51, and a opening module 53 connected in parallel with the closing module 52 and in series with the clutch 51. The closing module 52 includes an S5 switch 521, the main contact 522 of a first four-pole contactor connected in series with the S5 switch 521, and a closing relay 523 connected in parallel with the main contact 522 of the first four-pole contactor at the output terminal of the S5 switch 521. The opening module 53 includes an S6 switch 531, an opening relay 532 connected in series with the S6 switch 531, and the main contact 533 of a second four-pole contactor connected in parallel with the opening relay 532 at the output terminal of the S6 switch 531. Currently, the auxiliary contacts 43 / 44 of the contactor are connected in series in the control system of the electromagnetic clutch, and the clutch module is disconnected by the auxiliary contacts 43 / 44. The clutch module current of the dual-motor mechanism is approximately 1.6A. Normally, contactor auxiliary contacts are only used in control or signal circuits, where the current is typically in the milliampere range, and the breaking capacity is insufficient. To improve the breaking capacity of the 43 / 44 pair, this method uses the main contacts 522 of the first four-pole contactor and the main contacts 8 / 9 of the second four-pole contactor to replace the original contactor's top auxiliary contacts 43 / 44 in the circuit.

[0046] Furthermore, the closing circuit module includes a first closing circuit submodule 6 and a second closing circuit submodule 7, with the first closing circuit submodule 6, the time relay 4, and the second closing circuit submodule 7 connected in series.

[0047] Furthermore, the tripping circuit module includes a first tripping sub-circuit sub-module 8 connected in parallel with the first closing circuit sub-module 6, and a second tripping sub-circuit sub-module 9 connected in parallel with the second closing circuit sub-module 7. The first tripping sub-circuit sub-module 8, the time relay 4, and the second tripping circuit sub-module 9 are connected in series.

[0048] Preferably, the second closing circuit submodule 7 includes an S1 switch 71, and the S1 switch 71 is connected to the time relay 4 by wires. The S1 switch 71 is the structure in the independent 1.

[0049] Furthermore, the second trip circuit submodule 9 includes an S2 switch 91, whose wires are connected to a time relay 4. The S2 switch 91 is the same structure as in the independent circuit 1.

[0050] During use: The electromagnetic clutch is equivalent to an inductor coil. Switches S1 71 and S2 91 continuously disconnect the inductor current of the electromagnetic clutch. The main contacts 522 of the first four-pole contactor and the main contacts 8 / 9 of the second four-pole contactor 533 have the ability to continuously disconnect the inductor current of the electromagnetic clutch.

[0051] After the isolating switch is in the open / closed position, the circuit is disconnected by S1 switch 71 and S2 switch 91. The main contacts 8 / 9 of the first four-pole contactor 522 and the second four-pole contactor 533 disconnect the circuit and the clutch module 5. Then, the motor power circuit is disconnected by the other main contacts of the first four-pole contactor 522 and the second four-pole contactor 533. This effectively avoids the phenomenon of poor contact caused by the limit switch directly disconnecting the clutch module.

[0052] Example 3 like Figure 8 As shown, the third embodiment of the present invention differs from the first embodiment in that: workers are notified to perform line maintenance.

[0053] In the control system of the disconnecting switch and grounding switch of the generator circuit breaker, our company has designed a mechanism operation timeout protection function. Under normal circumstances, the disconnecting switch and grounding switch can complete the opening or closing operation within 3 seconds. However, when the clutch module suddenly loses power or for other reasons, the opening or closing time exceeds 6 seconds.

[0054] The purpose of this measure is to trigger a fault signal exceeding 6 seconds to alert the backend. Currently, the ABB brand CT-MFE time relay is used. Figure 5The 89T time relay, with only one pair of contacts, has been used to disconnect the control system in case of timeout. To elicit a fault signal exceeding 6 seconds, this time relay can be replaced with an ODES STR-F1-5 time relay, which has two pairs of contacts: one pair for disconnecting the control system (still used with time relay 4), and the other pair for sending a signal to the backend (e.g., ...). Figure 8 As shown, it can be connected in series with the existing cutter / ground cutter operation signal circuit, or it can be connected in series with other circuits to achieve synchronous operation. In the event of an operation timeout in the mechanism, the maintenance personnel will be notified to handle the situation on site.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An operating mechanism for a generator circuit breaker disconnect switch, characterized in that: include, A cam wheel body (1), the lower end face of which is connected to the turbine of the operating mechanism for rotation; and, The protrusion (2) includes a first protrusion (21) disposed on the side circumferential surface of the cam wheel body (1) and a second protrusion (22) disposed on the side circumferential surface of the cam wheel body (1) and connected to the first protrusion (21). The end faces of the first protrusion (21) and the second protrusion (22) that are far apart from each other are provided with stepped grooves (3) for pressing multiple limit switches of the operating mechanism in sequence under the rotation of the cam wheel body (1).

2. The generator circuit breaker disconnector operating mechanism as described in claim 1, characterized in that: The end face of the first protrusion (21) away from the second protrusion (22) forms an S1 switch pressing surface (211) and an S5 switch pressing surface (212). The S1 switch pressing surface (211) is located below the S5 switch pressing surface (212), and the S1 switch pressing surface (211) is located on the side of the S5 switch pressing surface (212) away from the second protrusion (22).

3. The generator circuit breaker disconnector operating mechanism as described in claim 2, characterized in that: The second protrusion (22) forms an S2 switch pressing surface (221) and an S6 switch pressing surface (222) on the end face away from the first protrusion (21). The S2 switch pressing surface (221) is located below the S6 switch pressing surface (222), and the S2 switch pressing surface (221) is located on the side of the S6 switch pressing surface (222) away from the first protrusion (21).

4. The generator circuit breaker disconnector operating mechanism as described in claim 3, characterized in that: The pressing surfaces of the S1 switch (211), the S5 switch (212), the S2 switch (221), and the S6 switch (222) are all inclined surfaces.

5. A control system comprising the generator circuit breaker disconnector operating mechanism according to any one of claims 1-4, characterized in that: It also includes, A time relay (4) is used to cut off the circuit according to the time setting; Clutch module (5) is used to control the clutch module to be energized and the clutch to engage after receiving the tripping command; The closing circuit module is connected in series with the time relay (4) to control the opening contactor of the system to be energized and self-holding, and the mechanism starts to perform the opening operation; The tripping circuit module is connected in series with the time relay (4) to control the closing contactor of the system to be energized and self-holding, and the mechanism starts to perform the closing operation.

6. The control system as described in claim 5, characterized in that: The clutch module (5) includes a clutch (51), a closing module (52) connected in series with the clutch (51), and a discharging module (53) connected in parallel with the closing module (52) and connected in series with the clutch (51).

7. The control system as described in claim 6, characterized in that: The closing circuit module includes a first closing circuit submodule (6) and a second closing circuit submodule (7), wherein the first closing circuit submodule (6), the time relay (4) and the second closing circuit submodule (7) are connected in series.

8. The control system as described in claim 7, characterized in that: The tripping circuit module includes a first tripping sub-circuit sub-module (8) connected in parallel with the first closing circuit sub-module (6), and a second tripping sub-circuit sub-module (9) connected in parallel with the second closing circuit sub-module (7). The first tripping sub-circuit sub-module (8), the time relay (4), and the second tripping sub-circuit sub-module (9) are connected in series.

9. The control system as described in claim 8, characterized in that: The second closing circuit submodule (7) includes an S1 switch (71), the S1 switch (71) wires being connected to the time relay (4).

10. The control system as described in claim 9, characterized in that: The second tripping sub-circuit sub-module (9) includes an S2 switch (91), the S2 switch (91) being wired to the time relay (4).

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