Mechanical interlocking device for mutual locking of high voltage switch breaker and grounding switch

Abstract

The present invention discloses a mechanical interlocking device for mutually locking a high-voltage switch circuit breaker and a grounding switch, comprising an operating lever assembly, a latch assembly, a grounding switch locking rod assembly, and a circuit breaker locking assembly; the grounding switch is locked by driving the grounding switch locking rod through the operating lever, while releasing the circuit breaker body interlock; the circuit breaker locking slider is pushed by the circuit breaker locking rod to lock the circuit breaker body interlocking lock tongue, while releasing the grounding switch operating hole sleeve interlock. To achieve mutual locking between the circuit breaker and the grounding switch. It meets the five-protection requirements of high-voltage switch equipment, is safer during operation and maintenance, can prevent personal injury and property loss caused by human errors and misoperation, and meets the operation and maintenance needs of the power system.

Description

Technical Field

[0001] The present invention relates to a 40.5KV high-voltage complete switchgear (hereinafter referred to as "switchgear"), and in particular to a mechanical interlocking device for mutually locking a high-voltage switch breaker and a grounding switch. Background Art

[0002] With the rapid development of the power industry, high-voltage complete switchgear is being used more and more widely. In particular, during the use of switchgear, there are still safety hazards in preventing misoperation, which has a great impact on the safe operation of the power system. The "five-prevention" interlocking mechanism of the switchgear is a basic requirement to ensure the safe operation, inspection and maintenance of the switchgear.

[0003] At present, the cabinet type of common 40.5kV switchgear is basically fixed, and the grounding switch operating mechanism is basically the same, but the circuit breaker models configured for the switchgear are varied and different. This puts forward higher requirements for changes in two of the "five protections" of the switchgear - "grounding switch locking circuit breaker" and "circuit breaker locking grounding switch". Summary of the invention

[0004] The object of the present invention is to provide a mechanical interlocking device for mutually locking a high voltage switch breaker and a grounding switch.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A mechanical interlocking device for mutually locking a high-voltage switch circuit breaker and a grounding switch of the present invention comprises an operating lever assembly, a grounding switch locking rod assembly, a circuit breaker locking assembly, and a latch assembly;

[0007] The operating lever assembly comprises an operating lever, the middle portion of which is hinged to an operating lever support, the rear end of which is an operating end and is provided with an operating lever return spring, and the front end of which is provided with a long hole;

[0008] The grounding switch locking rod assembly comprises a grounding switch locking rod, the middle portion of the grounding switch locking rod is slidably connected to the locking rod support, the upper end of the grounding switch locking rod corresponds to the interlocking hole of the grounding switch operating mechanism and is provided with a locking rod reset spring, the lower end of the grounding switch locking rod is connected to the circuit breaker locking rod, and the middle portion of the circuit breaker locking rod is hinged to the long hole at the front end of the operating lever;

[0009] The circuit breaker locking assembly includes a circuit breaker locking slider and a 40.5kV circuit breaker interlocking lock tongue. The circuit breaker locking slider is fixed on the circuit breaker locking lock rod. The 40.5kV circuit breaker interlocking lock tongue is installed on the circuit breaker locking slider guide and is provided with a circuit breaker locking slider reset spring. The outer side of the circuit breaker locking slider is provided with an inclined surface, and the inclined surface contacts the round head at the rear end of the 40.5kV circuit breaker interlocking lock tongue. The 40.5kV circuit breaker body is provided with a lock hole corresponding to the 40.5kV circuit breaker interlocking lock tongue.

[0010] It can be seen from the technical solution provided by the present invention that the mechanical interlocking device for mutually locking the high-voltage switch circuit breaker and the grounding switch provided in the embodiment of the present invention makes the switch equipment safer to use and repair, and can prevent human misoperation through the forced mechanical locking device, thereby avoiding causing personal injury and property loss. The design of this locking mechanism is an important and key part of the "five-prevention" interlocking of the switch equipment, which can meet the needs of safe operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic structural diagram of a mechanical interlocking device for mutually locking a high-voltage switch breaker and a grounding switch provided in an embodiment of the present invention.

[0012] Figure 2 Schematic diagram of the structure of the circuit breaker locking assembly in an embodiment of the present invention.

[0013] Figure 3 Schematic diagram of the structure of the grounding switch locking rod assembly in an embodiment of the present invention.

[0014] Figure 4 and Figure 5 They are respectively schematic diagrams of unlocking and locking of the operating mechanism of the grounding switch according to an embodiment of the present invention.

[0015] Figure 6a and Figure 6b They are respectively side and front schematic diagrams of a 40.5 kV circuit breaker interlocking tongue extending out of the circuit breaker body in an embodiment of the present invention.

[0016] In the figure:

[0017] 1-grounding switch locking rod, 2-locking rod reset spring, 3-locking rod support, 4-operating lever reset spring, 5-operating lever, 6-circuit breaker locking rod, 7-operating lever support, 8-circuit breaker locking slide guide, 9-circuit breaker locking slide, 10-circuit breaker locking slide reset spring, 11-latch assembly (standard part), 12-grounding switch operating shaft, 13-40.5kV switchgear body, 14-40.5kV switchgear cabinet, 15-40.5kV circuit breaker interlocking tongue, 16-40.5kV circuit breaker body, 17-grounding switch operating mechanism, 18-grounding switch opening position interlocking hole, 19-inner shaft sleeve, 20-grounding switch operating mechanism unlocking, 21-grounding switch operating mechanism locking. DETAILED DESCRIPTION

[0018] The embodiments of the present invention will be described in further detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to those skilled in the art.

[0019] The preferred specific implementation of the mechanical interlocking device for mutually locking the high-voltage switch breaker and the grounding switch of the present invention is:

[0020] It includes an operating lever assembly, a grounding switch locking rod assembly, a circuit breaker locking assembly, and a latch assembly;

[0021] The operating lever assembly comprises an operating lever, the middle portion of which is hinged to an operating lever support, the rear end of which is an operating end and is provided with an operating lever return spring, and the front end of which is provided with a long hole;

[0022] The grounding switch locking rod assembly comprises a grounding switch locking rod, the middle portion of the grounding switch locking rod is slidably connected to the locking rod support, the upper end of the grounding switch locking rod corresponds to the interlocking hole of the grounding switch operating mechanism and is provided with a locking rod reset spring, the lower end of the grounding switch locking rod is connected to the circuit breaker locking rod, and the middle portion of the circuit breaker locking rod is hinged to the long hole at the front end of the operating lever;

[0023] The circuit breaker locking assembly includes a circuit breaker locking slider and a 40.5kV circuit breaker interlocking lock tongue. The circuit breaker locking slider is fixed on the circuit breaker locking lock rod. The 40.5kV circuit breaker interlocking lock tongue is installed on the circuit breaker locking slider guide and is provided with a circuit breaker locking slider reset spring. The outer side of the circuit breaker locking slider is provided with an inclined surface, and the inclined surface contacts the round head at the rear end of the 40.5kV circuit breaker interlocking lock tongue. The 40.5kV circuit breaker body is provided with a lock hole corresponding to the 40.5kV circuit breaker interlocking lock tongue.

[0024] The latch assembly is arranged corresponding to the rear end of the operating lever and comprises a latch, a compression spring and a bracket.

[0025] The grounding switch operating mechanism comprises a grounding switch operating shaft, the grounding switch operating shaft is provided with an inner sleeve, the inner sleeve is provided with a grounding switch opening position interlocking hole, and the upper end of the grounding switch locking rod corresponds to the position of the grounding switch opening position interlocking hole.

[0026] The mechanical interlocking device of the high-voltage switch circuit breaker and the grounding switch of the present invention is safer when the switch equipment is used and repaired. The forced mechanical locking device can prevent human error operation and avoid causing life injury and property loss. The design of this locking mechanism is an important and key part of the "five-prevention" interlocking of the switch equipment, which can meet the safe operation requirements of the power system. Specific embodiment:

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, the mechanical interlocking device for the mutual locking of the high-voltage switch circuit breaker and the grounding switch is designed on the basis of the existing switch equipment by adding a lever and a slider mechanism to lock one of the circuit breaker and the grounding switch, thereby realizing the mutual locking between the circuit breaker and the grounding switch.

[0029] The working principle is:

[0030] High-voltage complete switchgear has "five-protection" interlocking requirements, among which the circuit breaker and the grounding switch are required to be locked with each other, which is reflected in the first protection: preventing power from being supplied to the grounded part (requiring the grounding switch to lock the circuit breaker), and the second protection: preventing the live part from being grounded (requiring the circuit breaker to lock the grounding switch).

[0031] First, prevent power from being supplied to the grounded part (requires the grounding switch to lock the circuit breaker). Figure 4 As shown, in the switchgear, the circuit breaker is in the test position and in the open state, and the operating lever of the device of the present invention is in the released state. Under the joint action of the locking rod reset spring and the operating lever reset spring, the circuit breaker locking rod pushes the circuit breaker locking slider, and pushes the 40.5kV circuit breaker interlocking lock tongue into the circuit breaker body to achieve circuit breaker locking. The circuit breaker cannot be closed or moved at this time. At the same time, the locking rod of the grounding switch locking rod shrinks outside the operating hole sleeve, and the sleeve in the operating hole is unlocked. The operating handle can compress the sleeve into the operating hole and connect with the operating shaft of the grounding switch to achieve the opening and closing of the grounding switch. Vice versa. In other words, when the grounding switch can be opened and closed, the circuit breaker must be in the test position, and cannot be closed or moved to prevent power from being supplied to the grounding part.

[0032] Secondary protection: prevent live parts from being grounded (requires circuit breaker to lock grounding switch) Figure 5 As shown, the device of the present invention is designed with a locking hole on the shaft sleeve in the operating hole of the grounding switch. When the grounding switch is in the off state, the locking hole is released and aligned with the grounding switch locking rod. In this state, the operating lever is pressed downward, and the grounding switch locking rod can enter the locking hole and lock the lever with a latch to achieve grounding switch locking. At the same time, the operating lever drives the circuit breaker locking rod to move upward. Under the action of the circuit breaker locking slider reset spring, the circuit breaker locking slider moves into the circuit breaker locking slider guide. At this time, the 40.5kV circuit breaker interlocking lock tongue extends out of the circuit breaker body ( Figure 6a , Figure 6b ), unlocking the 40.5kV circuit breaker, and the circuit breaker can be opened and closed and moved in and out of the switchgear. Vice versa. That is to say, when the grounding switch is in the open state, the grounding switch operating sleeve is locked by operating the lever, and the interlocking lock tongue of the circuit breaker body can be released. At this time, the circuit breaker can be closed and moved. The grounding switch cannot be closed to prevent the live parts from being grounded.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A mechanical interlocking device for mutually locking a high-voltage switch breaker and a grounding switch, characterized in that: It includes an operating lever assembly, a grounding switch locking rod assembly, a circuit breaker locking assembly, and a latch assembly; The operating lever assembly comprises an operating lever (5), the middle part of the operating lever (5) is hinged to the operating lever support (7), the rear end of the operating lever (5) is an operating end and is provided with an operating lever return spring (4), and the front end of the operating lever (5) is provided with a long hole; The grounding switch locking rod assembly comprises a grounding switch locking rod (1), the middle part of the grounding switch locking rod (1) is slidably connected to a locking rod support (3), the upper end of the grounding switch locking rod (1) corresponds to an interlocking hole of a grounding switch operating mechanism and is provided with a locking rod reset spring (2), the lower end of the grounding switch locking rod (1) is connected to a circuit breaker locking rod (6), and the middle part of the circuit breaker locking rod (6) is hinged to a long hole at the front end of the operating lever (5); The circuit breaker locking assembly comprises a circuit breaker locking slider (9) and a 40.5 kV circuit breaker interlocking tongue (15), wherein the circuit breaker locking slider (9) is fixed on the circuit breaker locking rod (6), the 40.5 kV circuit breaker interlocking tongue (15) is mounted on the circuit breaker locking slider guide (8) and is provided with a circuit breaker locking slider reset spring (10), an inclined surface is provided on the outer side of the circuit breaker locking slider (9), the inclined surface contacts the round head at the rear end of the 40.5 kV circuit breaker interlocking tongue (15), and a locking hole corresponding to the 40.5 kV circuit breaker interlocking tongue (15) is provided on the 40.5 kV circuit breaker body (16).

2. The mechanical interlocking device for mutually locking a high-voltage switch breaker and a grounding switch according to claim 1, characterized in that: The latch assembly is arranged corresponding to the rear end of the operating lever (5), and comprises a latch (11), a compression spring and a bracket.

3. The mechanical interlocking device for mutual locking of a high-voltage switch breaker and a grounding switch according to claim 1 or 2, characterized in that: The grounding switch operating mechanism comprises a grounding switch operating shaft (12), the grounding switch operating shaft is provided with an inner shaft sleeve (19), the inner shaft sleeve (19) is provided with a grounding switch opening position interlocking hole (18), and the upper end of the grounding switch locking rod (1) corresponds to the position of the grounding switch opening position interlocking hole (18).

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