CN216489041U

CN216489041U - L-shaped grounding change-over switch of high-voltage switch cabinet

Info

Publication number: CN216489041U
Application number: CN202122590387.9U
Authority: CN
Inventors: 李祥福; 何志江; 田印福; 鲍威
Original assignee: China Third Metallurgical Group Co Ltd
Current assignee: China Third Metallurgical Group Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-05-10
Anticipated expiration: 2031-10-27

Abstract

The utility model provides an L-shaped grounding change-over switch of a high-voltage switch cabinet, which comprises a transmission mechanism, an L-shaped disconnecting link, an insulating rod, a grounding porcelain insulator support, a lightning arrester porcelain insulator support, a current transformer and a disconnecting link clamp, wherein the transmission mechanism is connected with the L-shaped disconnecting link through a transmission mechanism; the L-shaped disconnecting link is fixed on the insulating rod, the transmission mechanism drives the insulating rod to rotate so as to drive the L-shaped disconnecting link to rotate, the L-shaped disconnecting link comprises 2 rotating angles, one L end of the L-shaped disconnecting link is contacted with the current transformer through the disconnecting link clamp during the first rotating angle, and the other L end of the L-shaped disconnecting link is contacted with the grounding porcelain insulator support through the disconnecting link clamp; and when the current transformer rotates for the second angle, one L end of the L-shaped disconnecting link is contacted with the lightning arrester porcelain insulator support through the disconnecting link clamp, and the other L end of the L-shaped disconnecting link is contacted with the current transformer through the disconnecting link clamp. Novel L type ground connection change over switch separately designs arrester and high tension cable, avoids overhauing the experiment and dismantles the arrester lead wire, improves test efficiency greatly and shortens repair time.

Description

L-shaped grounding change-over switch of high-voltage switch cabinet

Technical Field

The utility model relates to the technical field of energy recovery and power generation, in particular to an L-shaped grounding change-over switch of a high-voltage switch cabinet and a change-over method.

Background

In the middle-positioned high-voltage switch cabinet, the grounding switch is one of indispensable devices for ensuring the power failure maintenance of the devices, and jointly forms five-prevention interlocking protection of the high-voltage switch cabinet, the structure of the grounding switch is shown in figure 1, after the grounding switch is switched on, the front cabinet door and the rear cabinet door of the high-voltage switch cabinet are allowed to be opened, and meanwhile, a current transformer, a lightning arrester and a high-voltage cable are grounded. To putting into operation electric substation, in order to guarantee high-voltage equipment safety, carry out the insulation test to the arrester every year, need go on after separating arrester and other equipment, this lead wire that just needs to take the arrester apart, resumes after the experiment again, and the disconnection lead wire has taken three quarters of the time, because the power failure maintenance time is short, this work efficiency who has just greatly restricted the maintenance.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems in the prior art, the utility model provides the L-shaped grounding change-over switch of the high-voltage switch cabinet, the lightning arrester and the high-voltage cable are separately designed by the novel L-shaped grounding change-over switch, the lightning arrester lead wire is prevented from being disassembled in an overhaul experiment, the test efficiency is greatly improved, and the overhaul time is greatly shortened.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an L-shaped grounding change-over switch of a high-voltage switch cabinet comprises a transmission mechanism, an L-shaped disconnecting link, an insulating rod, a grounding porcelain insulator support, a lightning arrester porcelain insulator support, a current transformer and a disconnecting link clamp; the L-shaped knife switch is fixed on the insulating rod, the transmission mechanism drives the insulating rod to rotate so as to drive the L-shaped knife switch to rotate, the L-shaped knife switch comprises 2 rotation angles, one L end of the L-shaped knife switch is contacted with the current transformer through the knife switch clamp during the first rotation angle, and the other L end of the L-shaped knife switch is contacted with the grounding porcelain insulator support through the knife switch clamp; and when the current transformer rotates for the second angle, one L end of the L-shaped disconnecting link is contacted with the lightning arrester porcelain insulator support through the disconnecting link clamp, and the other L end of the L-shaped disconnecting link is contacted with the current transformer through the disconnecting link clamp.

Furthermore, the transmission mechanism comprises a transmission rod, a positioning bayonet lock, a crank arm and an angle adjusting rod, wherein the transmission rod drives the L-shaped disconnecting link to rotate for 90 degrees through the crank arm and the angle adjusting rod, and the L-shaped disconnecting link is positioned through the positioning bayonet lock after being rotated to the position.

Furthermore, the insulation rod enables the three-phase disconnecting links to reach an insulation standard with respect to the ground, the section of the insulation rod is of a square four-edge structure, four sides of the insulation rod are subjected to groove processing at the fixing position of the L-shaped disconnecting link so as to position the disconnecting link, and the L-shaped disconnecting link is a copper conductor and plays a role in conductor connection.

Compared with the prior art, the utility model has the beneficial effects that:

1) the L-shaped grounding diverter switch of the utility model separately designs the lightning arrester and the high-voltage cable, and the lightning arrester is separated from the high-voltage cable through the connection of the L-shaped knife switch in the grounding state, thereby facilitating the detection of the lightning arrester.

2) The grounding change-over switch can perform insulation test and leakage test of the lightning arrester without disassembling the lead of the lightning arrester as long as the switch is switched to a grounding state.

Drawings

Fig. 1 is a structural view of a conventional earthing switch mentioned in the background art;

FIG. 2 is a diagram of the grounding state of the L-shaped grounding switch of the high voltage switch cabinet according to the present invention;

FIG. 3 is a diagram of the operating status and position of the L-shaped grounding switch of the high-voltage switch cabinet according to the present invention;

FIG. 4 is a side view of the grounding state of the L-shaped grounding switch of the high-voltage switch cabinet according to the present invention;

FIG. 5 is a structural diagram of an insulating rod of an L-shaped grounding switch of a high-voltage switch cabinet according to the present invention;

fig. 6 is a control diagram of an L-shaped grounding switch of a high-voltage switch cabinet according to the utility model.

In the figure: the lightning arrester comprises a metal ground switch 1, a metal ground switch 2, a grounding flexible wire 3, a lightning arrester 4, a positioning bayonet 5, a transmission rod 6, a crank arm 7, an angle adjusting rod 8, an insulating rod 9, an L-shaped disconnecting link 10, a grounding porcelain insulator support 11, a grounding bus 12, a current transformer 13, a disconnecting link clamp 14, a lightning arrester porcelain insulator support 15, a bus 16 and a fixing bolt hole.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 2-5, an L-shaped grounding switch of a high-voltage switch cabinet comprises a transmission mechanism, an L-shaped knife switch 9, an insulating rod 8, a grounding porcelain insulator support 10, a lightning arrester porcelain insulator support 14, a current transformer 12 and a knife switch clamp 13; the L-shaped knife switch 9 is fixed on the insulating rod 8, the transmission mechanism drives the insulating rod 8 to rotate, so that the L-shaped knife switch 9 is driven to rotate, the L-shaped knife switch 9 comprises 2 rotation angles, one L end of the L-shaped knife switch 9 is in contact with the current transformer 12 through the knife switch clamp 13 during the first rotation angle, and the other L end of the L-shaped knife switch 9 is in contact with the grounding porcelain bottle support 10 through the knife switch clamp 13; at the second rotation angle, one L end of the L-shaped knife switch 9 is contacted with the lightning arrester porcelain insulator support 14 through the knife switch clamp 13, and the other L end is contacted with the current transformer 12 through the knife switch clamp 13.

The transmission mechanism comprises a transmission rod 5, a positioning bayonet 4, a crank arm 6 and an angle adjusting rod 7, wherein the transmission rod 5 drives an L-shaped knife switch 9 to rotate by 90 degrees through the crank arm 6 and the angle adjusting rod 7, and the L-shaped knife switch is positioned through the positioning bayonet 4 after rotating to the right position.

As shown in fig. 5, the insulation rod 8 makes the three-phase knife switches reach the insulation standard with respect to each other and the ground, the cross section of the insulation rod 8 is a square four-edge structure, four sides of the insulation rod 8 are grooved at the fixing position of the L-shaped knife switch 9 for positioning the knife switch, and the L-shaped knife switch 9 is a copper conductor and plays a role of connecting a conductor.

According to the switching method of the L-shaped grounding switch of the high-voltage switch cabinet, the grounding switch has a bidirectional switching function and is divided into a grounding state and an operating state; in the grounding state, the lightning arrester 3 is disconnected from the current transformer 12 and the external high-voltage cable; in the operating state, the lightning arrester 3 is connected with a cable through an L-shaped knife switch 9, and the switching method comprises the following steps:

1) when the device normally operates, the grounding change-over switch is positioned at the position of an operating state, and at the moment, the lightning arrester 3 is connected with the current transformer 12 and the high-voltage cable through the L-shaped disconnecting link 9, so that the device is protected from overvoltage;

2) when the lightning arrester needs to be overhauled, the transmission mechanism is operated, the grounding switch is switched to the position of a grounding state, the cabinet door of the switch cabinet is opened, the lightning arrester 3 is separated from other equipment, the insulation inspection and the high-voltage leakage test of the lightning arrester 3 can be carried out, and the lead of the lightning arrester 3 does not need to be disassembled;

3) when the maintenance is finished, operating the transmission mechanism to switch the grounding switch to the position of the running state;

4) the grounding state and the operating state of the grounding switch are positioned by the bayonet 4 through the transmission mechanism.

As shown in fig. 6, a control circuit diagram of an L-shaped grounding switch is shown, before the L-shaped grounding switch is operated, it is confirmed that the high-voltage circuit breaker handcart is placed in a test position, an unlocking button TA is started, the latching electromagnet YT is powered on, the capacitor C is charged simultaneously, the positioning bayonet 4 is unlocked, after the button TA is reset, the electromagnet is latched through capacitor discharge delay, the transmission rod 5 is rotated to a grounding state, the L-shaped disconnecting link 9 is rotated to ground the high-voltage cable and the current transformer 12, the lightning arrester 3 is separated from the high-voltage cable, and after the rotation is in place, the positioning bayonet 4 is locked, if the disconnecting link is not rotated in place, the adjusting bolt on the connecting lever 6 can be adjusted, and then the nut is locked. When the working state is switched, the unlocking positioning bayonet 4 rotates the transmission rod 5 in the opposite direction, the switch is switched to the working position, the L-shaped knife switch 9 is separated from the grounding porcelain insulator support 10, the lightning arrester 3 is connected with the high-voltage cable, and the positioning bayonet 4 locks the lightning arrester after the lightning arrester is in place.

The L-shaped grounding diverter switch of the utility model separately designs the lightning arrester 3 and the high-voltage cable, and the lightning arrester 3 is separated from the high-voltage cable through the L-shaped knife switch 9 in the grounding state, thereby facilitating the detection of the lightning arrester 3, and the switch has the biggest characteristic that the L-shaped knife switch 9 body is insulated to the ground, and the L-shaped knife switch 9 is operated by the transmission mechanism to carry out 90-degree rotation switching. The grounding change-over switch can perform insulation test and leakage test of the lightning arrester 3 only by switching the switch to a grounding state without disassembling a lead of the lightning arrester.

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. An L-shaped grounding change-over switch of a high-voltage switch cabinet is characterized by comprising a transmission mechanism, an L-shaped disconnecting link, an insulating rod, a grounding porcelain insulator support, a lightning arrester porcelain insulator support, a current transformer and a disconnecting link clamp; the L-shaped knife switch is fixed on the insulating rod, the transmission mechanism drives the insulating rod to rotate so as to drive the L-shaped knife switch to rotate, the L-shaped knife switch comprises 2 rotation angles, one L end of the L-shaped knife switch is contacted with the current transformer through the knife switch clamp during the first rotation angle, and the other L end of the L-shaped knife switch is contacted with the grounding porcelain insulator support through the knife switch clamp; and when the current transformer rotates for the second angle, one L end of the L-shaped disconnecting link is contacted with the lightning arrester porcelain insulator support through the disconnecting link clamp, and the other L end of the L-shaped disconnecting link is contacted with the current transformer through the disconnecting link clamp.

2. The L-shaped grounding switch of the high-voltage switch cabinet as claimed in claim 1, wherein the transmission mechanism comprises a transmission rod, a positioning bayonet lock, a crank arm and an angle adjusting rod, the transmission rod drives the L-shaped disconnecting link to rotate for 90 degrees through the crank arm and the angle adjusting rod, and the L-shaped disconnecting link is positioned through the positioning bayonet lock after rotating to the right position.

3. The L-shaped grounding switch of high-voltage switch cabinet as claimed in claim 1, wherein the insulation rod makes the three-phase switches reach the insulation standard with respect to each other and the ground, the cross section of the insulation rod is a square four-edge structure, and four sides of the insulation rod at the fixing position of the L-shaped switches are grooved.