CN114977099A

CN114977099A - Distribution circuit protection device and protection method thereof

Info

Publication number: CN114977099A
Application number: CN202210702276.9A
Authority: CN
Inventors: 杨俊伟; 杨斌
Original assignee: Neusoft Institute Guangdong
Current assignee: Neusoft Institute Guangdong
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-08-30

Abstract

The invention discloses a power distribution circuit protection device and a protection method thereof, and belongs to the technical field of circuit protection. A distribution circuit protection device, includes protecting sheathing and main transformer, main transformer installs in protecting sheathing, still includes: the first connecting socket is fixedly connected to the power transmission end of the main transformer; the fixing plate with an insulation effect is fixedly connected to the lower end, close to the first connecting socket, in the protective shell; the conductive rod is electrically connected with an external power transmission line, is connected to the fixing plate in a sliding manner, and is positioned right below the first connecting socket; and the first tensioning spring is sleeved on the conducting rod. When the emergency protection circuit is used, the whole circuit can be automatically powered off when an emergency accident happens, so that the power transmission circuit is protected emergently, great economic loss and casualties of surrounding personnel are prevented, and the emergency protection circuit is suitable for popularization and use.

Description

Distribution circuit protection device and protection method thereof

Technical Field

The invention relates to the technical field of circuit protection, in particular to a power distribution circuit protection device and a protection method thereof.

Background

The distribution system is the link that directly links to each other and distribute the electric energy to the user in electric power system, distribution system comprises distribution substation, high-voltage distribution line, distribution transformer, low-voltage distribution line and corresponding control protection equipment, china is when carrying electricity, generally can step up electricity, then carry it again, because the voltage of high-voltage electricity is higher, consequently before carrying each family, can carry out the step-down processing to high-voltage electricity, this just needs to use the transformer to convert voltage, thereby reduce voltage to 220V for the resident uses.

However, in the prior art, a protection device for the distribution circuit is lacked, if the distribution transformer generates heat seriously, the critical ignition is carried out, if the ignition is not carried out timely, the distribution transformer can catch fire, and then the fire can rapidly spread along the conducting circuit, so that the damage to the whole circuit is caused, great economic loss is caused, and the damage and death of personnel can be caused seriously, therefore, the distribution circuit protection device is needed to protect the circuit from the source.

Disclosure of Invention

The present invention is directed to a power distribution circuit protection device and a protection method thereof to solve the problems of the background art.

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

a distribution circuit protection device, includes protecting sheathing and main transformer, main transformer installs in protecting sheathing, still includes: the first connecting socket is fixedly connected to the power transmission end of the main transformer; the fixing plate with an insulation effect is fixedly connected to the lower end, close to the first connecting socket, in the protective shell; the conductive rod is electrically connected with an external power transmission line, is connected to the fixing plate in a sliding manner, and is positioned right below the first connecting socket; the first tensioning spring is sleeved on the conducting rod; the insulating plate is fixedly connected above the conducting rod close to the fixed plate, wherein two ends of the first tensioning spring are respectively and fixedly connected with the fixed plate and the insulating plate, two sides of the fixed plate close to the first tensioning spring are symmetrically and fixedly connected with limiting T-shaped rods, and the insulating plate is connected to the limiting T-shaped rods in a sliding mode; the first electromagnet is sleeved below the conducting rod close to the fixed plate and is fixedly connected with the fixed plate through a connecting rod; the iron plate is fixedly connected to the conducting rod through an insulating sleeve and is positioned between the fixing plate and the first electromagnet; and the temperature detector is fixedly connected at the position of the protective shell close to the main transformer.

In order to ensure the operation of the circuit, preferably, the inside of the protective housing is divided into an upper cavity and a lower cavity by a fixing plate, the main transformer is installed in the upper cavity, a standby transformer is installed in the lower cavity, the power transmission end of the standby transformer is fixedly connected with a second connecting socket, the second connecting socket is located under the conductive rod, and the main transformer, the standby transformer and the high-voltage power transmission line are electrically connected.

In order to facilitate the heat dissipation to the main transformer, preferably, the one side fixedly connected with heat absorption case that is close to the main transformer in the protecting sheathing, the heat absorption incasement is filled with volatile alcohol, the protecting sheathing is close to the upper end fixedly connected with cylinder of heat absorption case, be connected through the connecting pipe between the air inlet of cylinder and the gas outlet of heat absorption case, sliding connection has the piston rod that has the piston in the cylinder, piston rod upper end fixedly connected with movable plate, be close to the movable plate in the protecting sheathing directly over fixedly connected with distancer, the protecting sheathing is close to the lower extreme both sides fixedly connected with tuber pipe of main transformer, through branch fixedly connected with fan in the tuber pipe, one side that the distancer was kept away from to the protecting sheathing is equipped with the exhaust hole.

In order to improve the heat dissipation effect of the main transformer, the power consumption of the fan can be reduced, furthermore, an exhaust port is arranged on one side, close to the air inlet, of the air cylinder, and the diameter of the air inlet of the air cylinder is larger than that of the exhaust port.

In order to facilitate the recovery of alcohol, more closely, the position fixedly connected with condensing box that is close to the cylinder in the protecting sheathing, install the condenser in the condensing box, be connected through the blast pipe between the air inlet of condensing box and the gas vent of cylinder, the lower extreme fixedly connected with suction pump of condensing box, the inlet of suction pump is connected with the liquid outlet of condensing box, the liquid outlet of suction pump passes through the back flow with the liquid return mouth of heat absorption case and is connected, be equipped with the check valve in the back flow.

In order to facilitate carrying out quick fire extinguishing, furtherly, the upper end fixedly connected with fire source monitor who is close to the main transformer in the protecting sheathing, the upper end that the tuber pipe is close to the air outlet is equipped with the through-hole, fixedly connected with bin on the through-hole of tuber pipe, the bin intussuseption is filled with the dry powder of putting out a fire, the bin is close to the both sides rotation of discharge gate and is connected with the chamber door, the inside upper end fixedly connected with second electro-magnet of bin, be close to the both sides fixedly connected with second tensioning spring of second electro-magnet in the bin, the lower extreme fixedly connected with fly leaf of second tensioning spring, be close to the second electro-magnet on the fly leaf under fixedly connected with iron plate, it is connected with the regulation pole to rotate between fly leaf lower extreme and the chamber door.

In order to facilitate preventing the dry powder of putting out a fire from floating everywhere to collect it, more closely furtherly is, fixedly connected with protection casing on the lateral wall that protective housing is close to the exhaust hole, fixedly connected with filter screen in the protection casing, the below that the protection casing is close to the filter screen is equipped with the opening, the position threaded connection that the protection casing is close to the opening has the collection box.

In order to prevent external dust from entering the protective shell, a dust screen is fixedly connected to the air inlet of the air pipe.

In order to facilitate the gas to be directly blown to the main transformer, further, the air outlet of the air duct is designed to be inclined upwards and faces the main transformer.

A method of protecting a power distribution circuit protection device, comprising the steps of:

s1: when the main transformer generates heat seriously due to larger load or other problems, the temperature detector detects that the temperature of the main transformer exceeds a specified safety range, and then an external controller energizes the first electromagnet;

s2: then the first electromagnet can generate magnetic force, then the first electromagnet and the iron plate can attract each other under the action of the magnetic force, and then the iron plate can drive the conducting rod to overcome the tension of the first tensioning spring to move downwards, so that the conducting rod is moved out of the first connecting socket, and the whole circuit is disconnected;

s3: when the conducting rod moves to the lowest end, the lower end of the conducting rod can be inserted into the second connecting socket, so that the standby transformer can convert high voltage and low voltage;

s4: when maintenance personnel complete maintenance on the main transformer or the temperature is reduced to a safe range, the first electromagnet can be powered off, and then the conducting rod can be reinserted into the first connecting socket under the action of the first tensioning spring, so that the whole circuit can normally run.

Compared with the prior art, the invention provides a power distribution circuit protection device and a protection method thereof, and the power distribution circuit protection device has the following beneficial effects:

1. according to the power distribution circuit protection device, through the arrangement of the temperature detector, the conducting rod, the first electromagnet, the iron plate, the first tensioning spring and the insulating plate, when an emergency accident happens, the whole circuit can be automatically powered off, so that the power transmission circuit is protected emergently, and a large economic loss is prevented;

2. according to the distribution circuit protection device, through the arrangement of the standby transformer and the second connecting socket, when the conducting rod moves downwards, the conducting rod can be inserted into the second connecting socket, so that the standby transformer can convert high voltage and low voltage, the normal operation of the whole circuit is ensured, sufficient maintenance time is provided for maintenance personnel, and the economic loss problem caused by the fault of the main transformer is effectively reduced;

3. this kind of distribution circuit protection device uses through the cooperation of fan, fire source monitor, inside bin etc. that are equipped with the dry powder of putting out a fire, when main transformer excessively generates heat or takes place to catch fire, can dispel the heat or put out a fire to it rapidly to it, not only can reduce the frequency of outage, can also prevent to catch fire and lead to the fact the damage to whole circuit, the effectual protective effect who improves the device to the circuit.

The device has the advantages that the parts which are not involved in the device are the same as or can be realized by adopting the prior art, in the using process, when an emergency accident happens, the whole circuit can be automatically powered off, so that the power transmission circuit can be protected emergently, the large economic loss and the casualties of surrounding personnel can be prevented, and the device is suitable for popularization and use.

Drawings

Fig. 1 is a schematic structural diagram of a power distribution circuit protection device according to the present invention;

fig. 2 is a schematic structural diagram of a heat absorption box, an air cylinder and a condensation box in the power distribution circuit protection device according to the present invention;

fig. 3 is a schematic structural diagram of an air duct, a storage box, a blower, and an adjusting lever in the power distribution circuit protection device according to the present invention;

fig. 4 is a schematic structural diagram of a portion a in fig. 1 of a power distribution circuit protection apparatus according to the present invention;

fig. 5 is a schematic structural diagram of a portion B in fig. 1 of the protection apparatus for a power distribution circuit according to the present invention;

fig. 6 is a schematic structural diagram of a portion C in fig. 3 of the power distribution circuit protection apparatus according to the present invention;

fig. 7 is a schematic structural diagram of a shield, a filter screen, and a collection box in the power distribution circuit protection device according to the present invention.

In the figure: 1. a protective housing; 101. an upper cavity; 102. a lower cavity; 103. a temperature detector; 2. a fixing plate; 3. a main transformer; 301. a first connection socket; 4. a standby transformer; 401. a second connection socket; 5. a conductive rod; 6. a first electromagnet; 7. a connecting rod; 8. an iron plate; 9. an insulating sleeve; 10. an insulating plate; 11. a first tension spring; 12. limiting the T-shaped rod; 13. a heat absorption box; 14. a cylinder; 15. a distance meter; 16. a fire source monitor; 17. a piston rod; 18. moving the plate; 19. volatile alcohol; 20. an exhaust pipe; 21. a condenser tank; 22. a condenser; 23. a suction pump; 24. an air duct; 25. a fan; 26. a dust screen; 27. a storage tank; 28. a box door; 29. adjusting a rod; 30. a movable plate; 31. a second electromagnet; 32. an iron block; 33. a second tension spring; 34. a protective cover; 35. filtering with a screen; 36. and (4) collecting the box.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1:

referring to fig. 1 to 7, a power distribution circuit protection device includes a protective casing 1 and a main transformer 3, the main transformer 3 is installed in the protective casing 1, and further includes: a first connection socket 301 fixedly connected to a power transmission end of the main transformer 3; the fixing plate 2 with the insulation effect is fixedly connected to the lower end, close to the first connection socket 301, in the protective shell 1; the conducting rod 5 electrically connected with an external power transmission line is connected on the fixing plate 2 in a sliding manner and is positioned right below the first connecting socket 301; the first tension spring 11 is sleeved on the conducting rod 5; the insulating plate 10 is fixedly connected above the conducting rod 5 close to the fixed plate 2, wherein two ends of the first tensioning spring 11 are respectively and fixedly connected with the fixed plate 2 and the insulating plate 10, two sides of the fixed plate 2 close to the first tensioning spring 11 are symmetrically and fixedly connected with limiting T-shaped rods 12, and the insulating plate 10 is connected to the limiting T-shaped rods 12 in a sliding mode; the first electromagnet 6 is sleeved below the conducting rod 5 close to the fixed plate 2 and is fixedly connected with the fixed plate 2 through a connecting rod 7; the iron plate 8 is fixedly connected to the conducting rod 5 through an insulating sleeve 9 and is positioned between the fixed plate 2 and the first electromagnet 6; and the temperature detector 103 is fixedly connected to the position, close to the main transformer 3, of the protective shell 1.

When the device is used, firstly the device is moved to a designated working position, then the device is fixed, then a high-voltage power transmission line and a low-voltage power transmission line in a circuit are respectively electrically connected with a main transformer 3 and a conducting rod 5, then the device can be put into use, in an initial state, a first electromagnet 6 is in a power-off state, when the main transformer 3 generates heat seriously due to large load or other problems, a temperature detector 103 detects that the temperature of the main transformer 3 exceeds a specified safety range, then an external controller can electrify the first electromagnet 6, then the first electromagnet 6 generates magnetic force, then the first electromagnet 6 and an iron plate 8 attract and sum under the action of the magnetic force, then the iron plate 8 can drive the conducting rod 5 to overcome the tension of a first tensioning spring 11 to move downwards, so that the conducting rod 5 is moved out of a first connecting socket 301, make whole circuit break off, thereby carry out urgent processing to main transformer 3, prevent to take place the short circuit or catch fire and cause the damage to whole circuit because of main transformer 3 is overheated, thereby reduce the loss to the minimum, after main transformer 3 temperature drops to within the safe range, alright cut off the power supply to first electro-magnet 6, then the magnetic force of first electro-magnet 6 just can disappear, then conducting rod 5 just can upwards move under the effect of first tensioning spring 11, thereby make conducting rod 5 reinsert in first connection socket 301, make whole circuit can normal operating, through the setting of this device, can carry out automatic break-make to whole circuit, thereby carry out urgent protection to transmission of electricity circuit, prevent to take place great economic loss and the injures and deaths of peripheral personnel, be suitable for popularization and use.

Example 2:

referring to fig. 1 to 7, a power distribution circuit protection device, substantially the same as in embodiment 1, further comprising: the inside cavity 101, lower cavity 102 of separating into through fixed plate 2 of protecting sheathing 1, main transformer 3 installs in last cavity 101, installs reserve transformer 4 in the lower cavity 102, and reserve transformer 4's transmission of electricity end fixedly connected with second connection socket 401, second connection socket 401 are located conducting rod 5 under, equal electric connection between main transformer 3, reserve transformer 4 and the high-tension transmission line. Through the setting of the standby transformer 4, when the main transformer 3 is in fault due to short circuit or other reasons, in order not to damage the whole, at this time, the first electromagnet 6 is electrified, then the first electromagnet 6 generates magnetic force, so that the iron plate 8 is attracted downwards, then the conductive rod 5 is driven to overcome the tension of the first tensioning spring 11 and move downwards, then the conductive rod 5 is separated downwards from the first connecting socket 301, then the lower end of the conductive rod 5 is inserted into the second connecting socket 401, so that the standby transformer 4 converts high and low voltages, and the whole circuit can be ensured to operate normally, thereby providing sufficient maintenance time for maintenance personnel, and effectively reducing the problem of economic loss caused by the fault of the main transformer 3.

The protection method of the power distribution circuit protection device in the embodiment mainly comprises the following steps:

s1: when the main transformer 3 generates heat seriously due to a large load or other problems, the temperature detector 103 detects that the temperature of the main transformer 3 exceeds a specified safety range, and then an external controller energizes the first electromagnet 6;

s2: then the first electromagnet 6 will generate magnetic force, then the first electromagnet 6 and the iron plate 8 will attract each other under the action of the magnetic force, and then the iron plate 8 will drive the conductive rod 5 to overcome the tension of the first tension spring 11 to move downwards, so that the conductive rod 5 moves out of the first connection socket 301, and the whole circuit is disconnected;

s3: when the conductive rod 5 moves to the lowest end, the lower end of the conductive rod 5 is inserted into the second connection socket 401, so that the standby transformer 4 converts high voltage and low voltage;

s4: when the maintenance personnel complete the maintenance of the main transformer 3 or the temperature drops to the safe range, the first electromagnet 6 can be powered off, and then the conducting rod 5 can be reinserted into the first connecting socket 301 under the action of the first tension spring 11, so that the whole circuit can normally operate.

Example 3:

referring to fig. 1 to 7, a power distribution circuit protection device, substantially the same as in embodiment 1, further comprising: a heat absorption box 13 is fixedly connected to one side of the protective casing 1 close to the main transformer 3, volatile alcohol 19 is filled in the heat absorption box 13, a cylinder 14 is fixedly connected to the upper end of the protective casing 1 close to the heat absorption box 13, an air inlet of the cylinder 14 is connected with an air outlet of the heat absorption box 13 through a connecting pipe, a piston rod 17 with a piston is slidably connected in the cylinder 14, a movable plate 18 is fixedly connected to the upper end of the piston rod 17, a distance meter 15 is fixedly connected to the upper portion of the protective casing 1 close to the movable plate 18, air pipes 24 are fixedly connected to two sides of the lower end of the protective casing 1 close to the main transformer 3, a fan 25 is fixedly connected to the air pipes 24 through supporting rods, an exhaust hole is arranged on one side of the protective casing 1 away from the distance meter 15, when the main transformer 3 generates heat, the heat dissipated from the main transformer 3 can be absorbed by the heat absorption box 13, and then the volatile alcohol 19 in the heat absorption box 13 can be heated and volatilized, then, the gas generated by volatilization enters the cylinder 14, then the gas drives the moving plate 18 to move upwards through the piston rod 17, and when the distance meter 15 detects that the moving plate 18 moves upwards continuously, the fan 25 is controlled to work, so that the main transformer 3 can be blown and cooled, the internal part of the main transformer 3 is prevented from being short-circuited due to overheating, the influence on the whole circuit is avoided, and the running stability of the whole circuit is effectively improved.

The side of the cylinder 14 close to the air inlet is provided with an air outlet, the diameter of the air inlet of the cylinder 14 is larger than that of the air outlet, so that the amount of gas entering the cylinder 14 is larger than that of the exhausted gas, then the piston rod 17 can slowly move upwards under the pushing of the gas, when the distance between the movable plate 18 and the self is detected by the distance meter 15 to be reduced, the fan 25 is controlled to rotate by an external main controller, then the main transformer 3 is cooled, when the main transformer 3 emits hot heat, the volatile alcohol 19 can accelerate volatilization, then the amount of the gas entering the cylinder 14 is increased, then the speed of the movable plate 18 driven by the piston rod 17 is accelerated, when the main controller calculates the moving speed of the movable plate 18 by the distance meter 15, the fan 25 is controlled to accelerate the rotating speed, therefore, the heat dissipation efficiency of the main transformer 3 is improved, the wind power can be controlled according to the temperature of the main transformer 3 in real time by flexibly changing the rotating speed of the fan 25, the heat dissipation effect of the main transformer 3 can be improved, the power consumption of the fan 25 can be reduced, and the power consumption cost is effectively reduced.

A condenser 21 is fixedly connected to a position close to the cylinder 14 in the protective casing 1, a condenser 22 is installed in the condenser 21, an air inlet of the condenser 21 is connected with an air outlet of the cylinder 14 through an exhaust pipe 20, a suction pump 23 is fixedly connected to the lower end of the condenser 21, a liquid inlet of the suction pump 23 is connected with a liquid outlet of the condenser 21, a liquid outlet of the suction pump 23 is connected with a liquid return port of the heat absorption box 13 through a return pipe, a check valve is arranged in the return pipe, when gas generated by volatilization of volatile alcohol is exhausted from the air outlet of the cylinder 14, the volatile alcohol is conveyed into the condenser 21 along the exhaust pipe 20, then gaseous alcohol is condensed under the action of the condenser 22, so as to be converted into liquid, after certain liquid alcohol is stored in the condenser 21, the suction pump 23 is started at the moment, the suction pump 23 can convey the liquid alcohol in the condenser 21 back into the heat absorption box 13 again, thereby recycling the alcohol and effectively reducing the waste of resources.

The upper end of the protection shell 1 close to the main transformer 3 is fixedly connected with a fire source monitor 16, the upper end of the air pipe 24 close to the air outlet is provided with a through hole, the through hole of the air pipe 24 is fixedly connected with a storage box 27, the storage box 27 is filled with fire extinguishing dry powder, two sides of the storage box 27 close to the discharge hole are rotatably connected with a box door 28, the upper end inside the storage box 27 is fixedly connected with a second electromagnet 31, two sides of the storage box 27 close to the second electromagnet 31 are fixedly connected with a second tensioning spring 33, the lower end of the second tensioning spring 33 is fixedly connected with a movable plate 30, an iron block 32 is fixedly connected on the movable plate 30 under the second electromagnet 31, an adjusting rod 29 is rotatably connected between the lower end of the movable plate 30 and the box door 28, when in an initial state, the second electromagnet 31 is in an electrified state, so as to adsorb the iron block 32, at the moment, the box door 28 is in a closed state, when the fire source monitor 16 detects that the main transformer 3 catches fire, the external main controller can cut off the power supply to the second electromagnet 31 at this moment, then the magnetic force of the second electromagnet 31 can disappear, thereby not adsorbing the iron block 32, then the movable plate 30 can move downwards under the tension action of the second tension spring 33, then the movable plate 30 can push the box door 28 downwards through the adjusting rod 29, then the box door 28 can be opened, then the fire extinguishing dry powder in the storage box 27 can drop in the air inlet pipe 24, then the fire extinguishing dry powder can be blown into the protective housing 1 under the action of the fan 25, thereby quickly extinguishing the fire to the main transformer 3, prevent the great loss, and the protective effect of the device to the circuit is effectively improved.

Fixedly connected with protection casing 34 on the lateral wall that protecting sheathing 1 is close to the exhaust hole, fixedly connected with filter screen 35 in the protection casing 34, the below that protection casing 34 is close to filter screen 35 is equipped with the opening, the position threaded connection that protection casing 34 is close to the opening has collection box 36, when putting out a fire the dry powder and spouting when putting out a fire in protecting sheathing 1, the part dry powder of putting out a fire then can be through exhaust hole discharge protecting sheathing, all everywhere in order to prevent that the dry powder of putting out a fire from wandering, through protection casing 34, filter screen 35's setting, when putting out a fire the dry powder discharge protecting sheathing 1, the dry powder of putting out a fire can be blockked in protecting casing 34 by filter screen 35, then fall into again and collect in collecting box 36, so that it utilizes once more, not only can prevent that the dry powder of putting out a fire from wandering around, can also collect it, the effectual suitability that has improved the device.

The air inlet of the air pipe 24 is fixedly connected with a dust screen 26, and through the arrangement of the dust screen 26, the air entering the protective shell 1 can be filtered, so that external dust is prevented from entering the protective shell 1 and attaching to the surface of the main transformer 3, and the heat dissipation performance of the main transformer is influenced;

the air outlet of air pipe 24 is designed to incline upwards and face main transformer 3, and the air outlet of air pipe 24 faces main transformer 3, so that air can be directly blown to main transformer 3, and the heat dissipation effect on main transformer 3 is effectively improved.

According to the invention, through the arrangement of the temperature detector 103, the conducting rod 5, the first electromagnet 6, the iron plate 8, the first tension spring 11 and the insulating plate 10, when an emergency accident occurs, the whole circuit can be automatically powered off, so that the power transmission circuit is emergently protected, the large economic loss and the casualties of surrounding people are prevented, and the device is suitable for popularization and use.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A distribution circuit protection device, includes protecting sheathing (1) and main transformer (3), main transformer (3) are installed in protecting sheathing (1), its characterized in that still includes:

the first connecting socket (301) is fixedly connected to the power transmission end of the main transformer (3);

the fixing plate (2) with an insulation effect is fixedly connected to the lower end, close to the first connecting socket (301), in the protective shell (1);

the conductive rod (5) is electrically connected with an external power transmission line, is connected to the fixing plate (2) in a sliding manner, and is positioned right below the first connecting socket (301);

the first tensioning spring (11) is sleeved on the conducting rod (5);

an insulating plate (10) fixedly connected above the conducting rod (5) close to the fixed plate (2),

the two ends of the first tensioning spring (11) are respectively fixedly connected with the fixed plate (2) and the insulating plate (10), the two sides of the fixed plate (2) close to the first tensioning spring (11) are symmetrically and fixedly connected with limiting T-shaped rods (12), and the insulating plate (10) is connected to the limiting T-shaped rods (12) in a sliding mode;

the first electromagnet (6) is sleeved below the conducting rod (5) close to the fixed plate (2) and is fixedly connected with the fixed plate (2) through a connecting rod (7);

the iron plate (8) is fixedly connected to the conducting rod (5) through an insulating sleeve (9) and is positioned between the fixing plate (2) and the first electromagnet (6);

and the temperature detector (103) is fixedly connected to the position, close to the main transformer (3), of the protective shell (1).

2. The distribution circuit protection device according to claim 1, wherein the interior of the protective housing (1) is divided into an upper cavity (101) and a lower cavity (102) by a fixing plate (2), the main transformer (3) is installed in the upper cavity (101), the standby transformer (4) is installed in the lower cavity (102), the transmission end of the standby transformer (4) is fixedly connected with a second connection socket (401), the second connection socket (401) is located right below the conducting rod (5), and the main transformer (3), the standby transformer (4) and the high-voltage transmission line are all electrically connected.

3. The distribution circuit protection device according to claim 1, wherein a heat absorption box (13) is fixedly connected to one side of the protection housing (1) close to the main transformer (3), volatile alcohol is filled in the heat absorption box (13), a cylinder (14) is fixedly connected to the upper end of the protection housing (1) close to the heat absorption box (13), an air inlet of the cylinder (14) is connected to an air outlet of the heat absorption box (13) through a connecting pipe, a piston rod (17) with a piston is slidably connected to the cylinder (14), a movable plate (18) is fixedly connected to the upper end of the piston rod (17), a distance meter (15) is fixedly connected to the portion, right above the movable plate (18), of the protection housing (1), an air pipe (24) is fixedly connected to two sides of the lower end of the protection housing (1) close to the main transformer (3), fan (25) are fixedly connected with through branch in tuber pipe (24), one side that distancer (15) were kept away from in protecting sheathing (1) is equipped with the exhaust hole.

4. The distribution circuit protection device according to claim 3, wherein the cylinder (14) is provided with an exhaust port on a side close to the air inlet, and the diameter of the air inlet of the cylinder (14) is larger than that of the exhaust port.

5. The distribution circuit protection device according to claim 4, wherein a condenser box (21) is fixedly connected to a position close to the cylinder (14) in the protective housing (1), a condenser (22) is installed in the condenser box (21), an air inlet of the condenser box (21) is connected to an air outlet of the cylinder (14) through an exhaust pipe (20), a suction pump (23) is fixedly connected to a lower end of the condenser box (21), an inlet of the suction pump (23) is connected to an outlet of the condenser box (21), an outlet of the suction pump (23) is connected to a return port of the heat absorption box (13) through a return pipe, and a check valve is arranged in the return pipe.

6. The distribution circuit protection device according to claim 3, wherein the upper end of the protective housing (1) close to the main transformer (3) is fixedly connected with a fire source monitor (16), the upper end of the air pipe (24) close to the air outlet is provided with a through hole, the through hole of the air pipe (24) is fixedly connected with a storage box (27), the storage box (27) is filled with fire extinguishing dry powder, two sides of the storage box (27) close to the discharge hole are rotatably connected with a box door (28), the upper end of the inner part of the storage box (27) is fixedly connected with a second electromagnet (31), two sides of the storage box (27) close to the second electromagnet (31) are fixedly connected with a second tension spring (33), the lower end of the second tension spring (33) is fixedly connected with a movable plate (30), and an iron block (32) is fixedly connected on the movable plate (30) under the second electromagnet (31), an adjusting rod (29) is rotatably connected between the lower end of the movable plate (30) and the box door (28).

7. The distribution circuit protection device according to claim 6, characterized in that a protective cover (34) is fixedly connected to the outer side wall of the protective shell (1) close to the exhaust hole, a filter screen (35) is fixedly connected to the inside of the protective cover (34), a through hole is formed in the protective cover (34) close to the lower part of the filter screen (35), and a collecting box (36) is connected to the position of the protective cover (34) close to the through hole in a threaded mode.

8. The electrical distribution circuit protection device of claim 3, wherein a dust screen (26) is fixedly attached to an air inlet of the air duct (24).

9. The distribution circuit protection device according to claim 8, wherein the air outlet of the air duct (24) is designed obliquely upwards and faces the main transformer (3).

10. A method for protecting a power distribution circuit protection device using the power distribution circuit protection device according to any one of claims 1 to 9, comprising the steps of:

s1: when the main transformer (3) generates heat seriously due to large load or other problems, the temperature detector (103) detects that the temperature of the main transformer (3) exceeds a specified safety range, and then an external controller energizes the first electromagnet (6);

s2: then the first electromagnet (6) can generate magnetic force, then the first electromagnet (6) and the iron plate (8) can attract each other under the action of the magnetic force, and then the iron plate (8) can drive the conducting rod (5) to overcome the tension of the first tensioning spring (11) to move downwards, so that the conducting rod (5) is moved out of the first connecting socket (301), and the whole circuit is disconnected;

s3: when the conducting rod (5) moves to the lowest end, the lower end of the conducting rod (5) is inserted into the second connecting socket (401), so that the standby transformer (4) converts high voltage and low voltage;

s4: when maintenance personnel finish maintenance on the main transformer (3) or the temperature is reduced to a safe range, the first electromagnet (6) can be powered off, and then the conducting rod (5) can be inserted into the first connecting socket (301) again under the action of the first tensioning spring (11), so that the whole circuit can normally operate.