Automatic device for relay protection of power system

Abstract

The utility model relates to an automation device for relay protection of an electric power system, which comprises a coil shell, a plurality of coil cooling mechanisms are arranged on the coil shell, each coil cooling mechanism comprises a plurality of heat conduction pipes, the heat conduction pipes are fixedly communicated with the periphery of the coil shell, and the coil shell and the heat conduction pipes are filled with insulating oil; according to the automation device for relay protection of the power system, the coil is subjected to oil immersion cooling through insulating oil, the oil injection tank and the ten heat conduction pipes are matched to increase the heat dissipation surface area, when a coil shell in the opening and closing coil is used for being communicated with a circuit, the circuit of the motor is also in a communicated state, and fan blades are driven to rotate rapidly; external air is guided to flow through the outer surfaces of the ten heat conduction pipes and the lower surface of the oil injection tank for heat dissipation, the coil in the coil shell is rapidly cooled through rapid heat conduction of the insulating oil, the moving iron core in the coil shell can be lubricated by the insulating oil, and the situation that the power of the coil cannot be cut off due to the fact that the iron core is stuck is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of relay protection automatic devices, in particular to an automatic device for relay protection of an electric power system. Background Art

[0002] In recent years, with the continuous development of science and technology, the comprehensive automation of substations has become the mainstream, and the relay protection automatic device is one of the important equipment in the power system. At present, the existing relay protection automatic device is composed of three parts: measuring elements, logic links and execution units. The existing execution units are generally divided into two categories: one is the sound and light signal relay; (such as electric whistle, electric bell, flashing signal light, etc.) The other is the opening and closing coil of the operating mechanism of the circuit breaker, which makes the circuit breaker open. The working principle of the opening and closing coil is to form a magnetic field in the iron core through electromagnetic induction, so that the mechanical mechanism is activated to achieve the purpose of opening. This process involves the knowledge of electromagnetism and mechanics.

[0003] However, from the performance point of view, the opening and closing coil is designed for short-time power-on, and only allows a short-time rated current to pass through. If the continuous current passes through it for too long, the insulation performance of the insulating coating on the surface of the coil will deteriorate and eventually burn out. Therefore, the most common opening and closing coil failure is that it passes through the continuous current for too long and is burned out. In view of this, this paper aims to propose a coil cooling mechanism for cooling the opening and closing coil and increasing the power-on time of the opening and closing coil. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the opening and closing coils are burned out due to long-term energization, and proposes an automatic device for relay protection of a power system.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] An automatic device for relay protection of a power system comprises a coil housing, on which a plurality of coil cooling mechanisms are mounted;

[0007] The coil cooling mechanism includes a plurality of heat-conducting pipes, which are fixedly connected to the periphery of the coil housing and are used to increase the surface area of ​​the coil housing for heat dissipation. The coil housing and the plurality of heat-conducting pipes are filled with insulating oil.

[0008] Preferably, a plurality of strip oil holes are provided on the coil housing, and the coil cooling mechanism further comprises two mounting plates, the two mounting plates are respectively fixedly and sealedly mounted in the inner walls of the two strip oil holes, and one end of a plurality of the heat pipes are fixedly mounted on the two mounting plates.

[0009] Preferably, the upper ends of several of the heat conducting pipes are fixedly connected to an oil filling box, a threaded oil filling nozzle is fixedly installed on the upper end of the oil filling box, and a threaded cover is threadedly installed on the threaded oil filling nozzle.

[0010] Preferably, a motor is provided in a plurality of the heat-conducting tubes, and the motor is fixedly mounted on the two mounting plates via an arch frame, and a fan blade is fixedly mounted on an output shaft of the motor via a coupling.

[0011] Preferably, two baffles are fixedly mounted on both sides of the lower end of the oil filling box.

[0012] Preferably, a heat dissipation opening is reserved between two adjacent heat-conducting pipes.

[0013] Compared with the prior art, the utility model provides an automatic device for relay protection of a power system, which has the following beneficial effects:

[0014] The automatic device of the relay protection of the power system cools the coil by oil immersion through the rapid heat conduction of the insulating oil, and cooperates with the oil filling box and ten heat pipes to increase the surface area of ​​the internal insulating oil for dissipating heat to the outside. When the coil housing in the opening and closing coil is used in the connected circuit, the circuit of the motor is also in a connected state. The output shaft of the motor is used to drive the fan blades to rotate rapidly, draw air from multiple heat dissipation ports on the back of the fan blades, and then discharge air from multiple heat dissipation ports on the front of the fan blades, that is, the rapidly rotating fan blades are used to induce the outside air to flow through the outer surface of the ten heat pipes and the lower surface of the oil filling box, so as to dissipate heat for the ten heat pipes, the oil filling box and the insulating oil inside them, and the rapid heat conduction of the insulating oil quickly cools the coil in the coil housing, so as to timely discharge the heat generated by the coil, avoid the insulating coating on the surface of the coil from being burned, and thus extend the power-on time of the coil;

[0015] While the insulating oil is cooling the coil, due to its high viscosity, it can form an oil film on the surface of the moving iron core inside the coil housing, thereby lubricating the moving iron core in the coil housing. It can also prevent the iron core in the coil housing from getting stuck to a certain extent, and smoothly move to disconnect the circuit, thus reducing the occurrence of the coil being unable to be powered off due to the iron core getting stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an automation device for relay protection of a power system proposed by the utility model;

[0017] Figure 2 The utility model discloses an exploded diagram of a coil cooling mechanism in an automation device for relay protection of an electric power system.

[0018] In the figure: 1. Coil housing; 2. Strip oil hole; 3. Arch frame; 4. Motor; 5. Fan blades; 6. Mounting plate; 7. Heat pipe; 8. Oil filling box; 9. Threaded oil filling nozzle; 10. Baffle; 11. Threaded cover; 12. Heat dissipation port. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] See attached Figure 1-2 An automatic device for relay protection of a power system comprises a coil housing 1, the coil housing 1 is sealed and filled with insulating oil of a cooling oil transformer, and the surface of the enameled wire coil in the coil housing 1 is cooled by oil immersion through the insulating oil. The greater the thermal conductivity of the insulating oil, the stronger the ability of the insulating oil to conduct heat, and the better the insulation and cooling effect of the opening and closing coils;

[0022] It should be added that the thermal conductivity of insulating oil is generally around 0.09W / (m·k), and it has a strong ability to conduct heat. The heat generated by the coil in the inner cavity of the coil housing 1 after being energized is used to evenly distribute the heat in the inner cavity of the coil housing 1 through the rapid heat conduction of the insulating oil. Although the main function of the insulating oil is not lubrication, it also has a lubricating effect to a certain extent. Due to the high viscosity of the insulating oil, a layer of oil film can be formed on the surface of the moving iron core inside the coil housing 1, thereby achieving the purpose of lubricating the moving iron core, which can also prevent the iron core from getting stuck to a certain extent, and smoothly move to disconnect the circuit, thereby reducing the occurrence of the coil being unable to be powered off due to the iron core getting stuck.

[0023] In this embodiment, a coil cooling mechanism is installed on the upper end side of the coil housing 1, and a coil cooling mechanism can also be installed on the lower end side of the coil housing 1. The more coil cooling mechanisms there are, the better the cooling effect. This application mainly takes the coil cooling mechanism arranged on the upper end side of the coil housing 1 as an example, and two strip oil holes 2 for installing the coil cooling mechanism are arranged on both sides of the upper end side of the coil housing 1.

[0024] In this embodiment, the coil cooling mechanism includes two mounting plates 6, ten heat conducting pipes 7, an oil filling box 8, a threaded oil filling nozzle 9 and a threaded cover 11. The two mounting plates 6 are parallel to each other. The ten heat conducting pipes 7 and the oil filling box 8 are also filled with insulating oil. The two mounting plates 6 are respectively fixedly sealed in the two strip oil holes 2. The ten heat conducting pipes 7 are respectively fixedly mounted on the two mounting plates 6. The lower end of the heat conducting pipe 7 is connected to the inner cavity of the coil housing 1. The heat conducting pipe 7 in the prior art has good heat transfer performance. Heat can be quickly transferred to the other end. A heat dissipation port 12 is reserved between two adjacent heat-conducting tubes 7. The heat dissipation ports 12 on both sides correspond to each other and can realize convection. The lower end of the oil filling box 8 is fixedly connected to the upper ends of the ten heat-conducting tubes 7. The oil filling box 8 is made of stainless steel with good heat transfer performance. The inner cavity of the lower half of the oil filling box 8 is filled with insulating oil, and the inner cavity of the upper half is used to provide space for thermal expansion and contraction of the insulating oil. The oil filling box 8 cooperates with the ten heat-conducting tubes 7 to increase the surface area of ​​the internal insulating oil to dissipate heat outward.

[0025] In this embodiment, the lower end of the threaded oiling nozzle 9 is fixedly connected to the upper end of the oiling box 8, and the threaded cover 11 is threadedly installed on the upper end of the threaded oiling nozzle 9. A motor 4 is installed between the ten heat-conducting tubes 7. The motor 4 and the coil in the coil housing 1 are connected in parallel through a wire, and when the coil is connected to the circuit, the circuit in the motor 4 is also in a connected state. The motor 4 is fixedly installed on the two mounting plates 6 through the arch frame 3, and the output shaft of the motor 4 is fixedly installed with a fan blade 5 through a coupling. The fan blade 5 and the two mounting plates 6 are parallel to each other, and the air outlet of the fan blade 5 corresponds to the five heat-conducting tubes 7 on one side. Two baffles 10 are fixedly installed on both sides of the lower end of the oiling box 8, and the lower end of the baffle 10 is fixedly connected to the two mounting plates 6. The two baffles 10 are mainly used to guide the direction of the airflow, so that the air between the ten heat-conducting tubes 7 can only be drawn in and discharged through the heat dissipation ports 12 opposite to each other on both sides.

[0026] The utility model firstly cools the surface of the enameled wire coil in the coil housing 1 by oil immersion through the rapid heat conduction of the insulating oil, and cooperates with the oil filling box 8 and the ten heat conducting pipes 7 to increase the surface area of ​​the coil housing 1 and the internal insulating oil for heat dissipation. When the insulating oil cools the coil, due to the high viscosity of the insulating oil, an oil film can be formed on the surface of the moving iron core in the coil housing 1, thereby achieving the purpose of lubricating the moving iron core in the coil housing 1, and also preventing the iron core in the coil housing 1 from getting stuck to a certain extent, and smoothly moving to disconnect the circuit, thus reducing the occurrence of the situation where the coil cannot be powered off due to the iron core getting stuck.

[0027] When the coil housing 1 in the opening and closing coil is connected to the circuit for use, the circuit of the motor 4 is also in a connected state, and the output shaft of the motor 4 is used to drive the fan blade 5 to rotate rapidly, draw air from the heat dissipation port 12 between the five heat-conducting tubes 7 on the back of the fan blade 5, and then discharge air from the heat dissipation port 12 between the five heat-conducting tubes 7 on the front of the fan blade 5, that is, the rapidly rotating fan blade 5 is used to induce the outside air to flow through the outer surface of the ten heat-conducting tubes 7 and the lower surface of the oil filling box 8, so as to dissipate the heat of the ten heat-conducting tubes 7, the oil filling box 8 and the insulating oil therein, and the coil in the coil housing 1 is cooled by the rapid heat conduction of the insulating oil, so as to discharge the heat generated by the coil in time, avoid the insulating coating on the surface of the coil from being burned, and thus extend the power-on time of the coil.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic device for relay protection of a power system, comprising a coil housing (1), characterized in that: A plurality of coil cooling mechanisms are installed on the coil housing (1); The coil cooling mechanism comprises a plurality of heat-conducting pipes (7), wherein the heat-conducting pipes (7) are fixedly connected to the periphery of the coil housing (1) and are used to increase the surface area of ​​the coil housing (1) for heat dissipation, and the coil housing (1) and the plurality of heat-conducting pipes (7) are filled with insulating oil.

2. The automatic device for relay protection of a power system according to claim 1, characterized in that: The coil housing (1) is provided with a plurality of strip-shaped oil holes (2), and the coil cooling mechanism further comprises two mounting plates (6), the two mounting plates (6) being respectively fixedly and sealedly mounted on the inner walls of the two strip-shaped oil holes (2), and one end of the plurality of heat-conducting pipes (7) being fixedly mounted on the two mounting plates (6).

3. The automatic device for relay protection of a power system according to claim 1, characterized in that: The upper ends of the plurality of heat conducting pipes (7) are fixedly connected to an oil filling box (8), a threaded oil filling nozzle (9) is fixedly installed on the upper end of the oil filling box (8), and a threaded cover (11) is threadedly installed on the threaded oil filling nozzle (9).

4. The automatic device for relay protection of a power system according to claim 2, characterized in that: A motor (4) is arranged inside a plurality of the heat conducting pipes (7), and the motor (4) is fixedly mounted on the two mounting plates (6) via an arch frame (3), and a fan blade (5) is fixedly mounted on the output shaft of the motor (4) via a coupling.

5. The automatic device for relay protection of a power system according to claim 3, characterized in that: Two baffles (10) are fixedly mounted on both sides of the lower end of the oil filling box (8).

6. The automatic device for relay protection of a power system according to claim 1, characterized in that: A heat dissipation opening (12) is reserved between two adjacent heat-conducting pipes (7).

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