CN219267535U - Manual three-phase integrated three-station line isolating switch - Google Patents

Abstract

The utility model discloses a manual three-phase integrated three-station line isolating switch, which relates to the field of power equipment, and is formed by integrally connecting three single-pole switches with the same structure.

Description

Manual three-phase integrated three-station line isolating switch

Technical Field

The utility model relates to the field of power equipment, in particular to a manual three-phase integrated three-station line isolating switch.

Background

The isolating switch (commonly called as a knife switch) is generally a high-voltage isolating switch, and is mainly used for switching a charged high-voltage circuit of a load and electrically isolating the charged high-voltage circuit from a high-voltage bus to be overhauled or electric equipment such as a breaker in an outdoor alternating current 10-40.5kv and 50HZ power system. The isolating switch is mainly characterized in that the isolating switch has no arc extinguishing capability and can only switch on and switch off the circuit under the condition of no load current. The product is widely applicable to the fields of electric power, railways, mines, oil fields and the like. The working principle and the structure are simpler, but the requirements on reliability are high due to large consumption, and the design, establishment and safe operation of the substation and the power plant are greatly influenced.

The existing high-voltage isolating switch includes: the two insulating struts are vertically fixed on the mounting plate, umbrella groups with the same diameter are arranged on the insulating struts, movable contacts and fixed contacts are respectively fixed on the insulating struts, wiring terminals corresponding to the movable contacts and the fixed contacts are further arranged on the two insulating struts, wherein the first wiring terminals are connected with the movable contacts, the second wiring terminals are connected with the fixed contacts, two disconnecting links are connected between the two contacts in parallel, one ends of the two disconnecting links are hinged to the fixed contacts, and the other ends of the two disconnecting links can be closed or separated with the movable contacts.

The existing high-voltage isolating switch structure has the following defects:

1. the grounding disconnecting link is not arranged on part of the switches, so that a large potential safety hazard exists during line overhaul;

2. the isolating switch is provided with a grounding knife switch, and adopts a main grounding knife linkage mode, namely, the main knife switch is switched on while the grounding knife switch is switched off; the main knife is switched on and the ground knife is switched off. Therefore, the electricity inspection operation cannot be performed, and the application scene is limited.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the manual three-phase integrated three-station line isolating switch, which is provided with the main knife operating handle and the ground knife operating handle which are manually operated, and are connected through the locking device to realize mutual locking, so that operators can perform electroscope operation, the personal safety of field overhaul and maintenance staff is improved, the product structure is stable to operate, and the application range and the application prospect are wide.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a manual three-phase integrated three-station line isolating switch is formed by connecting three single-pole switches with the same structure into a whole, each single-pole switch comprises a base, two post insulators, a moving contact, a fixed contact, a touch plate, a grounding knife and an insulating pull rod, wherein the two post insulators are arranged on the base in parallel, the moving contact and the fixed contact are respectively arranged on the two post insulators, one end of the touch plate is hinged to the fixed contact, the other end of the touch plate is lapped on the moving contact, one end of the insulating pull rod is movably connected with the touch plate, the other end of the insulating pull rod is connected with a main shaft crank arm, the main shaft rotates to drive the touch plate to move so as to realize the opening and closing operation of the main knife, the grounding knife is arranged on one side of the base, and a rotating shaft of the grounding knife is arranged in parallel with the main shaft, the main knife is characterized in that a main knife operating handle is arranged at one end of the main knife and a ground knife operating handle is arranged through a shaft sleeve, a locking device is arranged between the main knife operating handle and the ground knife operating handle, the locking device comprises a self-locking plate, a locking plate and a locking pin, the self-locking plate and the locking plate are respectively and fixedly arranged on the main knife and a rotating shaft in parallel, one end of the locking pin is connected with the self-locking plate through a connecting rod structure, the other end of the locking pin penetrates through a reserved hole on a base to be matched with the locking plate, and when the main knife is switched on and off, the self-locking plate rotates along with the main knife, the locking pin is driven by the connecting rod structure to axially move in different directions, so that mutual restriction between the self-locking plate and the locking plate is realized, and mutual locking between the main knife and the ground knife is realized.

The movable contact and the fixed contact are arranged in an integrated structure with the corresponding wire holder, and the connecting support is fixed on the corresponding wire holder.

The ground knife operating handle adopts a four-bar structure to drive the rotating shaft to rotate.

The grounding knife is provided with an anti-falling spring.

The utility model has simple and compact structure, low cost and flexible operation, can respectively realize the opening and closing operation of the main ground knife according to a certain operation logic through the coaxially designed main ground knife operation handle, is very suitable for application scenes needing to carry out electricity checking operation, has stronger compatibility for other scenes, simultaneously greatly improves the safety of on-site personnel during line overhaul and maintenance due to the design of the locking structure and the anti-falling spring, is suitable for large-scale popularization and application, can realize the electric control operation of the main ground knife if being matched with an electric control device in subsequent application, and is beneficial to realizing the automation of distribution network.

Drawings

FIG. 1 is a schematic side view of a single pole switch according to the present utility model;

FIG. 2 is a top plan view of the installation of the present utility model;

FIG. 3 is a schematic view of a latch of the present utility model;

fig. 4 is a schematic diagram of the overall structure of the single-pole switch of the present utility model.

Detailed Description

The utility model is described in detail below with reference to the attached drawings and the specific embodiments:

as shown in fig. 1-4, the manual three-phase integrated three-station line isolating switch is formed by integrally connecting three single-pole switches with the same structure, each single-pole switch comprises a base 1, two post insulators 2, a moving contact 3, a fixed contact 4, a touch plate 5, a grounding knife 6 and an insulating pull rod 7, wherein the two post insulators 2 are arranged on the base 1 in parallel, the moving contact 3 and the fixed contact 4 are respectively arranged on the two post insulators 2, one end of the touch plate 5 is hinged to the fixed contact 4, the other end of the touch plate 5 is overlapped on the moving contact 3, one end of the insulating pull rod 7 is movably connected with the touch plate 5, the other end of the insulating pull rod is connected with a main shaft turning arm, the main shaft 10 is used for driving the touch plate 5 to move so as to realize main knife opening and closing operation, the grounding knife 6 is arranged on one side of the base 1, a rotating shaft 14 of the grounding knife 6 is arranged on the main shaft 10 in parallel, a main knife operating handle 8 is arranged on one side end of the main shaft 10, a ground knife operating handle 9 is arranged through a shaft sleeve, a locking device is arranged between the main knife operating handle 8 and the ground knife operating handle 9, the locking device comprises a self-locking plate 11, a locking plate 11 and a locking pin 13 are arranged on the main shaft 10 in parallel to the main shaft 10, and the main shaft 12 is in the main shaft 10, and the main shaft 10 is in the same direction as the main shaft is in the main shaft, and the main shaft 10 is in the main shaft, and the main shaft is in the main shaft 1, and the main shaft 1.

In the preferred embodiment, the moving contact 3 and the fixed contact 4 are integrally formed with the corresponding wire holder, and the connecting bracket is fixed on the corresponding wire holder.

In a preferred manner, in this embodiment, the ground knife operating handle 9 adopts a four-bar linkage 16 to drive the rotating shaft 14 to rotate.

In the preferred mode, in this embodiment, the grounding knife 6 is provided with the anti-falling spring 15, so that the grounding knife cannot fall under the influence of gravity when the switch is installed upside down, the port distance between the grounding knife 6 and the fixed contact 4 is ensured, and meanwhile, the acceleration during the spring over-center is favorable for the grounding knife to be switched on in place.

The locking mode of the locking device is specifically set in such a way that in the state of the grounding knife switch-off, the main knife can be switched off, after the main knife switch-off is completed, the on-site personnel can perform electricity inspection operation, and after the electricity inspection is correct, the grounding knife switch-on operation can be performed; and in the grounding knife closing state, the locking device prevents the main knife from closing, and in the same way, the locking device prevents the grounding knife from closing.

The two sides of the main knife operating handle 8 are respectively provided with a brake opening and closing indication mark, and a field operator is required to vertically pull the main knife operating handle 8 at one side of the brake opening mark downwards by using an insulating pull rod until the brake opening is in place; and closing the same. The difference is that the switch-off indication marks of the ground knife operating handle 9 are all positioned on one side of the handle, the switch-off of the ground knife requires on-site operators to vertically pull one side of the switch-off mark downwards by using an insulating pull rod until the switch-off is in place; the switch-on of the ground knife requires on-site operators to vertically push up one side of the switch-on/off mark by using an insulating pull rod. Of course, the above-mentioned switching-on/off operation logic between the main ground knives is established on the specific arrangement of the locking device, and the principle thereof has been described in the foregoing.

It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that the utility model is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the utility model.

Claims (4)

1. A manual three-phase integrated three-station line isolating switch is formed by connecting three single-pole switches with the same structure into a whole, each single-pole switch comprises a base (1), two post insulators (2), a moving contact (3), a fixed contact (4), a touch plate (5), a grounding knife (6) and an insulating pull rod (7), wherein the base (1) is provided with the two post insulators (2) in parallel, the two post insulators (2) are respectively provided with the moving contact (3) and the fixed contact (4), one end of the touch plate (5) is hinged to the fixed contact (4) and the other end of the touch plate is lapped on the moving contact (3), one end of the insulating pull rod (7) is movably connected with the touch plate (5), the other end of the insulating pull rod is connected with a main shaft crank arm, the main shaft (10) rotates to drive the touch plate (5) to move to realize the opening and closing operation of the main knife, the grounding knife (6) is arranged on one side of the base (1), a rotating shaft (14) of the grounding knife (6) is arranged with the main shaft (10), the end of the main shaft (10) is respectively provided with the moving contact pin (8), the locking device (13) is arranged on one side of the main shaft (10), the main knife (8) and the main knife (8) is provided with a locking device (9), the self-locking plate (11) and the locking plate (12) are respectively and fixedly arranged on the main shaft (10) and the rotating shaft (14) in parallel, one end of the locking pin (13) is connected with the self-locking plate (11) through a connecting rod structure, the other end of the locking pin penetrates through a reserved hole on the base (1) to be matched with the locking plate (12), when the main knife is switched on and off, the self-locking plate (11) rotates along with the main shaft (10), the locking pin (13) is driven by the connecting rod structure to axially move in different directions, mutual restriction between the locking pin and the locking plate (12) is achieved, and mutual locking between the main knives is achieved.

2. The manual three-phase integrated three-position line isolating switch according to claim 1, wherein the moving contact (3) and the fixed contact (4) are arranged as an integrated structure with the corresponding wire holder, and a connecting bracket is fixedly arranged on the corresponding wire holder.

3. The manual three-phase integrated three-station line isolating switch according to claim 1, wherein the ground knife operating handle (9) adopts a four-bar structure to drive the rotating shaft (14) to rotate.

4. A manual three-phase integrated three-position line disconnector according to claim 1, characterized in that the earthing knife (6) is provided with a drop-proof spring (15).

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