CN110767410A

CN110767410A - Anti-theft transformer

Info

Publication number: CN110767410A
Application number: CN201911069043.4A
Authority: CN
Inventors: 毛璐冰; 张亮; 李喆; 赵元龙; 张晓楠; 李宁
Original assignee: State Grid Shandong Electric Power Co Feicheng Power Supply Co; State Grid Corp of China SGCC; TaiAn Power Supply Co of State Grid Shandong Electric Power Co Ltd
Current assignee: State Grid Shandong Electric Power Co Feicheng Power Supply Co; State Grid Corp of China SGCC; TaiAn Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-02-07
Anticipated expiration: 2039-11-05
Also published as: CN110767410B

Abstract

The invention discloses an anti-theft transformer, which comprises a transformer body and steel support legs, wherein one or more first cavities are arranged in each support leg, an opening is formed in the lower side wall of each first cavity, thermite welding agents capable of moving up and down are arranged in the openings, an ignition rod is arranged in each thermite welding agent, a third contact, a fourth contact and a power supply in each first cavity form an ignition circuit of the ignition rod in a serial connection mode, when the thermite welding agents are positioned in the first cavities, the fourth contact is separated from the third contact, the ignition circuit is disconnected, and when the thermite welding agents move downwards at least partially to extend out of the openings to a set stroke, the fourth contact is contacted with the third contact, and the ignition circuit is connected. The anti-theft transformer can effectively increase the difficulty of stealing the transformer without changing the installation mode of the existing transformer, and has the advantages of convenience, easy use, low cost and good anti-theft effect.

Description

Anti-theft transformer

Technical Field

The invention relates to the technical field of transformer equipment, in particular to an electric anti-theft transformer.

Background

The transformer is one of important equipment in a power supply and distribution system, ensures the safe and reliable operation of the transformer, is in accordance with various aspects of production and life, and has important social significance.

The transformer is classified into a dry type transformer and an oil immersed type transformer according to a cooling form. The oil-immersed transformer is generally installed indoors or outdoors in an independent transformer due to the requirement of fire prevention, and has the characteristics of low cost, simple maintenance, reliable work, good heat dissipation, strong overload capacity and wide environment adaptation. Some lawbreakers earn economic benefits by stealing transformers, which affects the normal operation of power supply and distribution systems and causes property loss.

At present, the conventional anti-theft common methods for the oil-immersed transformer mainly comprise two methods, wherein one method is to weld a box cover and a box edge, and the other method is to adopt a special anti-theft bolt. However, the existing anti-theft technology has the following disadvantages: 1) the box cover and the box edge are welded to be dead, so that the transformer is prevented from being stolen, the maintenance is difficult, and the maintenance workload is large; 2) the special anti-theft bolt is adopted, the effect is not obvious, and the hydraulic breaking pliers or the small gas cutting can be broken.

Therefore, there is still a need to develop new anti-theft transformers.

Disclosure of Invention

In order to solve the problems of the background art, an aspect of the present invention provides an anti-theft transformer including a transformer body and steel legs, wherein one or more first cavities are formed in the legs, each of the first cavities has thermite, a third contact, a fourth contact and a power supply therein, and a lower sidewall of each of the first cavities has an opening in which thermite is disposed to be movable up and down, a striking rod is disposed in the thermite, the third contact, the fourth contact and the power supply constitute a striking circuit of the striking rod in series, the third contact is fixed in the first cavity, the fourth contact is connected to the thermite such that the fourth contact is separated from the third contact and breaks the striking circuit when the thermite is disposed in the first cavity, and when the thermite moves down to at least partially extend out of the opening to a set stroke, the fourth contact contacts the third contact and completes the ignition circuit.

Further, the set stroke is 1 to 5mm, preferably 2 to 3 mm.

Further, the opening is closed by the upper surface of the cross arm when the transformer body rests on the cross arm made of steel.

Furthermore, the supporting leg is also provided with a lock cylinder which can be rotated by a key, the ignition circuit also comprises a first contact and a second contact which are arranged on the lock cylinder, the first contact and the second contact are electrically connected when the lock cylinder is in a first position, and the first contact and the second contact are disconnected when the lock cylinder is in a second position.

Further, one or more springs are disposed in the first cavity, and when the thermite is located in the first cavity, one end of the spring in a compressed state abuts against the upper surface of the thermite and the other end is fixed to the inner side wall of the first cavity, thereby applying downward pressure to the thermite.

Further, the lower surface of the thermite flux is adhered to the upper surface of the cross arm.

Furthermore, a controller and a second ignition circuit are further arranged in the ignition circuit, the controller comprises an alarm device, a positioning device and a communication device, and the second ignition circuit is directly led out from the controller and is electrically connected to the ignition rod so that the controller can control and be connected.

Another aspect of the present invention provides a transformer antitheft method, including:

s100, providing the anti-theft transformer;

s200, placing the anti-theft transformer on the cross arm, pressing thermite into the opening by the cross arm, separating the fourth contact from the third contact and disconnecting the ignition circuit;

and S300, when the cross arm is separated from the support leg, so that the thermite is moved downwards to at least partially extend out of the opening to reach a set stroke, the fourth contact is contacted with the third contact and an ignition circuit is switched on to ignite an ignition rod, and then the ignition rod ignites the thermite to generate molten metal to weld the support leg to the cross arm.

Further, step S100 further includes: rotating the lock cylinder with a key in advance to break the electrical connection between the first contact and the second contact so that the anti-theft transformer is in a ready mode; step S200 further includes: after the transformer body is placed on the cross arm, the key is used for rotating the lock cylinder to enable the first contact and the second contact to be electrically connected, so that the anti-theft transformer is in an alert mode.

Further, step S300 further includes: when the controller in one first cavity detects that the third contact and the fourth contact are contacted to enter the anti-theft mode, the controller sends out a notification signal to the controllers in other first cavities, and after the other controllers receive the notification signal, the other controllers switch on the respective second ignition circuits to weld the supporting legs to the cross arm.

The anti-theft transformer can effectively increase the difficulty of stealing the transformer without changing the installation mode of the existing transformer, can be simply started and disarmed by a key, and has the advantages of convenience, easy use, low cost and good anti-theft effect.

Drawings

Fig. 1 shows a schematic view of the installation of an anti-theft transformer according to the invention;

fig. 2 shows a schematic structural view of the legs of the anti-theft transformer of the present invention;

in the figure: 1-a transformer body; 2-a leg; 21-a first cavity; 22-an opening; 23-a spring; 24-a spring support; 3, pole tower; 4-cross arm; 5-hoop holding; 6-pull wire rope; 71-thermite flux; 72-a firing bar; 721-magnesium tape; 722-heating wire; 73-first contact; 74-a second contact; 75-a third contact; 76-a fourth contact; 77-a controller; 78-a battery; 8-a separator; 91-a lock cylinder; 92-key.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, two cross arms 4 made of channel steel are fixed on two towers 3 through anchor ears 5 and bolts 8, a transformer body 1 is placed on the cross arms 4 through two support legs 2 made of square steel tubes, so that 4 contact parts are formed between the cross arms 4 and the support legs 2, and the upper end of the transformer body 1 is connected and fixed on the towers 3 through pull steel cables 6.

Referring to fig. 2, in each of the four contact portions, a first cavity 21 and a second cavity 25 partitioned by a partition plate 8 are provided in the leg 2, an thermite 71, a first contact 73, a second contact 74, a third contact 75, and a fourth contact 76 are provided in the first cavity 21, and a lower side wall of the first cavity 21 is provided with an opening 22 blocked by an upper surface of the cross arm 4, and the thermite 71 made of aluminum powder and metal oxide such as iron oxide powder, which is wrapped in aluminum foil, is inserted in the opening 22 in a vertically movable manner, so that the molten metal formed when the thermite 71 is ignited welds the leg 2 and the cross arm 4 together. Thermite solder 71 may be any suitable thermite solder known in the art, such as the thermite solder disclosed in chinese patent CN 104625480B. An ignition bar 72 for igniting the thermite weld 71 is provided in the thermite weld 71. Ignition bar 72 may be any suitable thermite ignition bar known in the art, particularly those that utilize a hot wire to generate heat to ignite the thermite, such as disclosed in chinese patent application CN 107030372A. In some cases, the ignition bar 72 may be made by simply winding the magnesium tape 721 around the heating wire 722, as shown in fig. 2. One end of the heating wire 722 is electrically connected to one of the positive/negative poles of the power supply 78 through the controller 77, the other end of the heating wire 722 is electrically connected to the first contact 73, the second contact 74 is electrically connected to the third contact 75, and the fourth contact 76 is electrically connected to the other of the positive/negative poles of the power supply 78 through the controller 77. A first contact 73 and a second contact 74 are provided at the inner end of the key cylinder 91 in the first cavity 21, and the electrical connection between the first contact 73 and the second contact 74 can be broken and made when the key cylinder 91 is turned by a key 92. The fourth contact 76 is disposed above the third contact 75 in an elongated manner and is fixedly connected to the thermite 71 such that when the thermite 71 moves downward, the fourth contact 76 is simultaneously moved downward by a set stroke until the fourth contact 76 is in electrical contact with the third contact 75. The set stroke is generally 1 to 5mm, preferably 2 to 3 mm. In some cases, the controller 77 and the battery 78 are provided in the second cavity 25, and the partition plate 8 is made of a fireproof heat insulating material such as rock wool, glass wool, mineral wool, or the like, in order to avoid damage that may be caused by the heat emitted when the thermite agent 71 is burned.

In some cases, three springs 23 and three spring supports 24 fixedly attached to the inner side wall of the foot 2 are also arranged in the first cavity 21 along the length of the foot 2. One end of the spring 23 in a compressed state abuts on the upper surface of the thermite weld 71 and the other end is fixed to the spring holder 24, thereby applying a downward pressure to the thermite weld 71. Thus, when the cross arm 4 is moved away from the foot 2, as long as any part of the thermite weld 71 moves with the cross arm 4, the corresponding spring 23 of the moving part will push the thermite weld 71 to move downward, bringing the fourth contact 76 into contact with the third contact 75, thereby increasing the sensitivity of the reaction to the cross arm 4 moving away from the foot 2.

When the transformer body 1 is placed on the cross arm 4, the key 92 may be rotated in advance to disconnect the electrical connection between the first contact 73 and the second contact 74 to enter a preparation mode, and an adhesive, preferably a spot adhesive, may be applied to the upper surface of the cross arm 4 or the lower surface of the thermite so that the thermite 71 is adhered to the upper surface of the cross arm 4 by the adhesive and the cross arm 4 is in close contact with the leg 2. When the transformer body 1 rests on the cross arm 4, thermite compound 71 is pressed into the opening 22, pushing the fourth contact 76 upwards away from the third contact 75, whereupon the key 92 can be used to rotate the key cylinder 91 so that the first contact 73 is electrically connected to the second contact 74, and the key 92 is then removed, thereby entering the armed mode. In the armed mode, if the transformer body 1 or the cross arm 4 is moved by an external force during a theft, such as to separate the cross arm 4 from the leg 2, the thermite 71 will drive the fourth contact 76 to move downward until it contacts the third contact 75, so that the ignition circuit of the heating wire 722 is turned on, the heating wire 722 is heated by the power supply of the power supply 78 to raise the temperature to the ignition point (510 ℃) of the magnesium strip, so as to ignite the ignition rod 72, and then the thermite 71 is ignited, the aluminum powder in the thermite 71 reacts with the metal oxide such as iron oxide powder to generate molten metal, and the cross arm 4 is welded with the leg 2, so as to enter the anti-theft mode, and the moving and carrying difficulty of the transformer body 1 will increase sharply due to the welding of the cross arm 4 on the leg 2, thereby effectively preventing the theft.

When the transformer body 1 needs to be normally repaired or moved, the key 92 is simply used to rotate the key cylinder 91 so that the first contact 73 is disconnected from the second contact 74, thereby exiting the armed mode and entering the standby mode, so that the ignition circuit of the heating wire 722 is not turned on even if the third contact 75 is in contact with the fourth contact 76 during the repair or movement.

In some cases, in the armed mode, the respective controllers 77 at the four contacts are communicatively connected to each other such that when one controller 77 detects that the third contact 75 and the fourth contact 76 are in contact to enter the anti-theft mode, the controller 77 sends a notification signal to the other controller 77, and the other controller 77, upon receiving the notification signal, turns on a second ignition circuit (not shown) of its heating wire 722 and also enters the anti-theft mode. The second ignition circuit may be directly led from the controller 77 and electrically connected to both ends of the heating wire 722, and is controlled to be turned on by the controller 77 according to the received notification signal. Therefore, when any one contact part is separated, all the contact parts are welded, and the difficulty of stealing the transformer is further increased.

In some cases, an alarm device and a positioning device such as a GPS and a beidou system are also provided in the controller 77. Upon entering the anti-theft mode, the controller 77 activates the alarm device to emit an alarm signal (e.g., a light, a sound, a radio signal, etc.) and determines the location of the stolen transformer using the locating device, thereby deterring the person performing the theft, and notifying security personnel of the transformer theft event and the place of occurrence.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An anti-theft transformer comprises a transformer body and steel support legs, and is characterized in that one or more first cavities are arranged in each support leg, thermite welding flux, a third contact, a fourth contact and a power supply are arranged in each first cavity, an opening is formed in the lower side wall of each first cavity, thermite welding flux capable of moving up and down is arranged in each opening, a ignition rod is arranged in each thermite welding flux, the third contact, the fourth contact and the power supply form an ignition circuit of the ignition rod in a series connection mode, the third contact is fixed in the first cavities, the fourth contact is connected to the thermite welding flux, the fourth contact is separated from the third contact when the thermite welding flux is located in the first cavities and breaks the ignition circuit, and when the thermite welding flux moves downwards at least partially to extend out of the openings to a set stroke, the fourth contact is contacted with the third contact and the ignition circuit is switched on.

2. Anti-theft transformer according to claim 1, characterized in that the set stroke is 1-5mm, preferably 2-3 mm.

3. The anti-theft transformer according to claim 1 or 2, characterized in that the opening is blocked by the upper surface of the cross-arm when the transformer body rests on the cross-arm made of steel.

4. The anti-theft transformer according to any one of claims 1 to 3, wherein said legs are further provided with a key-turnable key cylinder, and said ignition circuit further comprises a first contact and a second contact provided in the key cylinder, the first contact and the second contact being electrically connected when the key cylinder is in the first position and being disconnected when the key cylinder is in the second position.

5. The anti-theft transformer according to any one of claims 1 to 4, wherein one or more springs are further provided in said first cavity, one end of the spring in a compressed state abutting against the upper surface of the thermite when the thermite is located in the first cavity and the other end being fixed to the inner side wall of the first cavity, thereby applying a downward pressure on the thermite.

6. The anti-theft transformer according to claim 3, wherein a lower surface of said thermite flux is adhered to an upper surface of a cross-arm.

7. The anti-theft transformer according to any one of claims 1 to 6, characterized in that a controller and a second ignition circuit are further arranged in the ignition circuit, the controller comprises an alarm device, a positioning device and a communication device, and the second ignition circuit is directly led out from the controller and is electrically connected with the ignition rod so as to be controlled by the controller to be connected.

8. An anti-theft method for a transformer comprises the following steps:

s100, providing an anti-theft transformer according to any one of claims 1-7;

9. The transformer theft prevention method according to claim 8,

step S100 further includes: rotating the lock cylinder with a key in advance to break the electrical connection between the first contact and the second contact so that the anti-theft transformer is in a ready mode;

step S200 further includes: after the transformer body is placed on the cross arm, the key is used for rotating the lock cylinder to enable the first contact and the second contact to be electrically connected, so that the anti-theft transformer is in an alert mode.

10. The transformer theft prevention method according to claim 8 or 9,

step S300 further includes: when the controller in one first cavity detects that the third contact and the fourth contact are contacted to enter the anti-theft mode, the controller sends out a notification signal to the controllers in other first cavities, and after the other controllers receive the notification signal, the other controllers switch on the respective second ignition circuits to weld the supporting legs to the cross arm.