Metal armored high-voltage voltage transformer for motor train unit

Abstract

The utility model relates to a high-voltage measuring device for an electric power system of a motor train unit, in particular to a metal armored high-voltage voltage transformer for the motor train unit. Comprising an insulator and a coil device body sealed in the insulator, a primary high-voltage insulating sleeve is arranged on the top or the upper side portion of the insulator, and a primary high-voltage terminal and a shielding net surrounding the primary high-voltage terminal are arranged in the primary high-voltage insulating sleeve; a secondary terminal is arranged at the lower part of the insulator; a metal shell is arranged outside the insulator, and a semi-conductive layer is sprayed on the surface, located inside the metal shell, of the insulator. According to the utility model, the epoxy resin and the metal shell form a totally-enclosed dry-type structure, and the primary shielding lead is used in a matched manner, so that the problem of an original exposed high-voltage lead on the motor train unit is solved, the voltage condition can be monitored in real time, and the safety of the train in the running process is ensured; moreover, the system can adapt to a complex operation environment, and prevents the motor train unit from being affected by factors such as electromagnetic interference and temperature change in the operation process.

Description

Technical Field

[0001] The utility model relates to a high-voltage measuring device for an electric power system of a motor vehicle group, in particular to a metal armored high-voltage voltage transformer for the motor vehicle group. Background Art

[0002] With the continuous development of China's high-speed rail technology, the requirements for the safety and reliability of EMUs are becoming higher and higher. As one of the key equipment in the EMU power system, the voltage transformer can not only monitor the voltage in real time to ensure the safety of the train during driving; but also adapt to complex operating environments to avoid the EMU being affected by electromagnetic interference, temperature changes and other factors during operation. In recent years, voltage transformers connected with C-type European bushings still have problems such as exposed high-voltage wires, difficult shielding, and poor anti-interference ability. Therefore, there is an urgent need for a metal armored high-voltage voltage transformer for EMUs with a small size, simple structure, strong anti-interference ability, superior protection performance, high operational safety, and suitable for various environments such as high and low altitudes and high humidity. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a metal armored high-voltage voltage transformer for EMUs to solve the problems of exposed high-voltage wires, difficult shielding, poor anti-interference ability, etc. in existing high-voltage voltage transformers for EMUs.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a metal armored high-voltage voltage transformer for EMUs, comprising an insulator and a coil body sealed in the insulator, wherein a primary high-voltage insulating sleeve is provided on the top or upper side of the insulator, a primary high-voltage terminal and a shielding net surrounding the primary high-voltage terminal are provided in the primary high-voltage insulating sleeve; a secondary terminal is provided at the bottom of the insulator; a metal shell is provided on the outside of the insulator, a semi-conductive layer is sprayed on the surface of the insulator located on the inner side of the metal shell, and the semi-conductive layer is in contact with the metal shell for conduction.

[0006] The shielding net is a ring-shaped metal wire net symmetrically provided with embedded nuts, the outer surfaces of the ring-shaped metal wire net and the embedded nuts are evenly sprayed with a layer of semi-conductive paint, and the embedded nuts are embedded in the insulator.

[0007] The secondary terminals include an input secondary terminal and an output secondary terminal, and a secondary fuse is arranged on the circuit connected to the input secondary terminal.

[0008] The secondary terminal is wrapped by the protruding portion of the metal shell and then closed by the secondary terminal cover plate. The protruding portion of the metal shell is provided with a cable waterproof connector connected to the secondary terminal.

[0009] The primary high-voltage insulating bushing and the insulator are cast with epoxy resin to form an integrated structure.

[0010] The primary high-voltage insulating bushing is a conical structure.

[0011] The insulator is a rectangular parallelepiped structure, and transition slopes are provided on the tops, left and right sides of the front and back surfaces.

[0012] The coil body includes an iron core, a secondary winding and a primary winding. The secondary winding and the primary winding are concentrically wound on an insulating frame from the inside to the outside and then sleeved on the core column of the iron core. The primary lead of the primary winding is connected to the primary high-voltage terminal, and the secondary lead of the secondary winding is connected to the secondary terminal.

[0013] The insulator is arranged on a bottom plate, the bottom plate is connected to the EMU, and the primary high-voltage insulating bushing is butt-jointed with a primary connecting cable on the EMU.

[0014] The utility model has the following advantages and beneficial effects:

[0015] The utility model adopts a fully enclosed dry structure composed of epoxy resin and metal shell, and uses a primary shielded wire to solve the problem of exposed high-voltage wires on the EMU. It can not only monitor the voltage in real time to ensure the safety of the train during operation, but also adapt to complex operating environments to avoid the EMU being affected by electromagnetic interference, temperature changes and other factors during operation. The main advantages are:

[0016] 1. Small size, flexible installation, and anti-interference: The metal armored transformer C-type head is matched with high-voltage shielded cable, and the high-voltage wire is not exposed, so that the installation is not restricted by space, the protection performance is excellent, and the influence of external electromagnetic interference on the transformer is effectively shielded.

[0017] 2. The electric field inside and outside is uniform, and it can be touched with electricity. The shell is protected: the metal shell design and the inner surface of the metal shell and the resin body are provided with a semi-conductive layer. The electric field inside and outside the product is uniform, and it can be touched with electricity. The operation is safer, the reliability is high, and it can work stably in harsh environments. The metal shell can withstand greater pressure and protect the internal structure and the external body. Even if the mutual inductor fails, it will not affect external equipment.

[0018] 3. Anti-leakage, full shielding, strong anti-interference ability: The high-voltage primary terminal shielding net is the same as the metal shell through the semi-conductive layer, the full shielding effect is better, the anti-interference ability is strong, and the leakage discharge of the primary high voltage to the outside is eliminated, further enhancing the touchable safety.

[0019] 4. Strong protection performance, overcurrent protection: The metal shell and metal waterproof connector make the secondary terminal unaffected by dust and moisture; the secondary fuse is added to prevent the secondary overcurrent from affecting the transformer. Ensure that the transformer is not burned, and perform secondary overcurrent protection when the product is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the internal structure and the matching cable interface of the metal armored high-voltage voltage transformer for the EMU of the utility model;

[0021] Figure 2 This is a front view of the metal armored high-voltage voltage transformer for EMU of the utility model;

[0022] Figure 3 It is a top view of the metal armored high-voltage voltage transformer for EMU of the utility model.

[0023] In the figure: 1- iron core, 2- secondary winding, 3- primary winding, 4- primary high-voltage insulating sleeve, 5- primary high-voltage terminal, 6- shielding net, 7- insulator, 8- metal shell, 9- semi-conductive layer, 10- cable waterproof connector, 11- secondary terminal cover, 12- input secondary terminal, 13- output secondary terminal, 14- secondary fuse, 15- bottom plate, 16- primary connecting cable. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 3 As shown, the utility model provides a metal armored high-voltage voltage transformer for EMUs, including an insulator 7 and a coil body sealed in the insulator 7, wherein a primary high-voltage insulating sleeve 4 is provided on the top or upper side of the insulator 7, and a primary high-voltage terminal and a shielding net 6 surrounding the primary high-voltage terminal 5 are provided in the primary high-voltage insulating sleeve 4; a secondary terminal is provided at the lower part of the insulator 7; a metal shell 8 is provided on the outer side of the insulator 7, and a semi-conductive layer 9 is sprayed on the surface of the insulator 7 located on the inner side of the metal shell 8, and the semi-conductive layer 9 is in contact with the metal shell 8 for conduction.

[0026] like Figure 1 As shown, in an embodiment of the utility model, the coil body includes an iron core 1, a secondary winding 2 and a primary winding 3. The secondary winding 2 and the primary winding 3 are concentrically wound on an insulating frame from the inside to the outside and then mounted on the core column of the iron core 1. The primary lead of the primary winding 3 is connected to the primary high-voltage terminal 5, and the secondary lead of the secondary winding 2 is connected to the secondary terminal.

[0027] Furthermore, the insulator 7 is arranged on the bottom plate 15, the bottom plate 15 is connected to the EMU, and the primary high-voltage insulating bushing 4 is connected to the primary connecting cable 16 on the EMU.

[0028] In the embodiment of the utility model, the shielding net 6 is a ring-shaped metal wire mesh on which embedded nuts are symmetrically arranged, and the outer surfaces of the ring-shaped metal wire mesh and the embedded nuts are evenly sprayed with a layer of semi-conductive paint, and the embedded nuts are embedded in the insulator 7. The semi-conductive layer 9 is semi-conductively connected to the shielding net 6, and the product can be touched with electricity.

[0029] In the embodiment of the utility model, the secondary terminal includes an input secondary terminal 12 and an output secondary terminal 13, and a secondary fuse 14 is provided on the line connected to the input secondary terminal 12. Through the principle of electromagnetic induction, the input secondary terminal 12 and the output secondary terminal 13 obtain a secondary voltage proportional to the primary voltage.

[0030] Furthermore, the secondary terminal is wrapped by the protruding portion of the metal shell 8 and then closed by the secondary terminal cover plate 11. The protruding portion of the metal shell 8 is provided with a cable waterproof connector 10 connected to the secondary terminal.

[0031] In the embodiment of the utility model, the primary high-voltage insulating sleeve 4 and the insulator 7 are cast with epoxy resin as an integrated structure, the primary high-voltage insulating sleeve 4 is a conical structure, and the insulator 7 is a rectangular parallelepiped structure, and the top and left and right sides of the front and back sides are provided with transition slopes.

[0032] The utility model provides a metal armored high-voltage voltage transformer for EMU, and the preparation process is as follows:

[0033] The secondary winding 2 and the primary winding 3 are concentrically wound on an insulating frame from the inside to the outside and then mounted on the core column of the iron core 1. The secondary winding 2 leads to the input secondary terminal 12 and the output secondary terminal 13. A secondary fuse 14 is set on the line of the input secondary terminal 12. After insulation and buffering wrapping, it is installed in a fixed mold. The primary high-voltage terminal 5 passes through the shielding net 6 and is fixed in the C-type head cavity mold to prevent the primary high voltage from leaking to the outside. The shielding net 6 is a ring-shaped metal wire mesh with embedded nuts symmetrically arranged. The outer surfaces of the ring-shaped metal wire mesh and the embedded nuts are evenly sprayed with a layer of semi-conductive paint. Epoxy resin is vacuum cast, and after gel curing, it becomes an insulator 7 of an integrated structure. After the epoxy resin on the surface of the molded insulator 7 is sandblasted, a semi-conductive layer 9 is sprayed on the surface except for the secondary terminal and the primary high-voltage insulating sleeve 4, and the end face of the embedded nut is connected to the shielding net 6, making the operation safer, more reliable, and stable in harsh environments. The insulator 7 treated by spraying the semi-conductive layer 9 is transferred to the machining workshop for welding the metal shell 8, so that the metal shell 8 is connected to the semi-conductive layer 9 to form a low-voltage grounding terminal, and the surface voltage is close to zero and can be directly touched. The metal shell 8 can withstand greater pressure and protect the internal structure and the external vehicle body. Even if the transformer fails, it will not affect external equipment. The secondary winding 2 leads to the input secondary terminal 12 and the output secondary terminal 13. A secondary fuse 14 is set on the input secondary terminal 12 line. The input secondary terminal 12, the output secondary terminal 13 and the secondary fuse 14 are wrapped by the protruding part of the metal shell 8, and then closed by the secondary terminal cover 11. The transformer secondary cable is connected to the cable waterproof connector 10. The semi-finished product after welding the metal shell 8 is fixed on the bottom plate 15, and the gap is sealed. The dustproof and waterproof capabilities of the input secondary terminal 12 and the output secondary terminal 13 are further increased. The finished primary high-voltage insulating bushing 4 is connected to the primary connecting cable 16 on the EMU, the primary high voltage is connected at the same potential inside the cable, and the product casing is connected to the cable outer shielding at the same potential and grounded, making the operation safer, facilitating high-voltage wiring, and saving EMU installation space.

[0034] In this embodiment, the primary high-voltage insulating sleeve 4 wraps the primary high-voltage terminal 5, and is located in the vertically upward position of the epoxy resin body or the horizontally forward position of the primary winding 3. The primary high-voltage insulating sleeve 4 is a standard C-shaped head with a stepped truncated cone structure, which is consistent with the shape of the primary connecting cable 16, and is rigorously and reliably sealed during insulation. It is consistent with the shape of the primary connecting cable 6, and is rigorously and reliably sealed during insulation. A semi-conductive layer 9 is provided between the inner surface of the metal shell 8 and the outer surface of the epoxy resin. The semi-conductive layer 9 and the metal shell 8 are in contact and conductive, forming an effective contact with the external metal shell, improving the electric field distribution, and reducing the interface field strength. The primary high-voltage terminal 5 passes through the center of the shielding net 6, and the shielding net 6 is connected to two embedded nuts. The end face of the embedded nut is connected to the semi-conductive layer 9, and the joint action makes the electric field distribution more uniform, reduces the phenomenon of excessive local field strength, avoids the occurrence of corona, and improves the operating reliability of the electrical equipment. The secondary terminal cover plate 11 cooperates with the cable waterproof connector 10 to lead out the cable and seal the secondary terminal. Avoid short-circuit faults caused by moisture, keep the inside of the terminal dry, and make the insulation reliable; prevent the wiring from being damaged by external factors and extend the service life; reduce the entry of pollutants such as dust to ensure the good electrical connection. The functions of the secondary fuse 14 added to the line of the input secondary terminal 12: 1. Protect the circuit: When the circuit is overloaded or short-circuited, the fuse will blow in time to cut off the fault current and protect the secondary equipment from damage. 2. Improve safety: Avoid electrical accidents caused by faults and ensure the safety of personnel and equipment. 3. Prevent the expansion of faults: Cut off the fault point in time to prevent the expansion of the scope of the fault. 4. Easy to maintain: When the fuse blows, the fault can be quickly found and replaced or repaired.

[0035] The utility model is a new product designed in full accordance with national and international standards and special requirements of EMUs, which is a metal armored high-voltage voltage transformer for EMUs. It adopts a rolled iron core and utilizes the electromagnetic conversion principle to enable the secondary voltage to accurately reflect the change of the primary voltage. It is used for voltage measurement and relay protection. The product has stable insulation, good sealing, wide application environment and small size. It greatly improves the reliability of power supply. It adopts metal casing and high-voltage shielded cable terminal technology and can be directly installed in the switch cabinet of the EMU, realizing the integration and miniaturization of the switch cabinet.

[0036] The utility model provides a metal armored high-voltage voltage transformer for EMUs, which is made of epoxy resin and a metal shell in one body, has the advantages of small size, flexible installation, uniform electric field, long maintenance period and wide application.

[0037] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A metal armored high-voltage voltage transformer for EMU, characterized in that: The invention comprises an insulator (7) and a coil body sealed in the insulator (7), wherein a primary high-voltage insulating sleeve (4) is provided at the top or upper side of the insulator (7), a primary high-voltage terminal and a shielding net (6) surrounding the primary high-voltage terminal (5) are provided in the primary high-voltage insulating sleeve (4); a secondary terminal is provided at the bottom of the insulator (7); a metal shell (8) is provided on the outside of the insulator (7), a semi-conductive layer (9) is sprayed on the surface of the insulator (7) located inside the metal shell (8), and the semi-conductive layer (9) and the metal shell (8) are in contact and conductive.

2. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The shielding net (6) is a ring-shaped metal wire net with embedded nuts symmetrically arranged on it. The outer surfaces of the ring-shaped metal wire net and the embedded nuts are evenly sprayed with a layer of semi-conductive paint. The embedded nuts are embedded in the insulator (7).

3. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The secondary terminals include an input secondary terminal (12) and an output secondary terminal (13), and a secondary fuse (14) is provided on a line connected to the input secondary terminal (12).

4. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The secondary terminal is wrapped by the protruding portion of the metal shell (8) and then closed by a secondary terminal cover plate (11). The protruding portion of the metal shell (8) is provided with a cable waterproof connector (10) connected to the secondary terminal.

5. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The primary high-voltage insulating bushing (4) and the insulator (7) are cast with epoxy resin to form an integrated structure.

6. The metal-armored high-voltage voltage transformer for EMU according to claim 5, characterized in that: The primary high-voltage insulating bushing (4) is of a conical structure.

7. The metal-armored high-voltage voltage transformer for EMU according to claim 5, characterized in that: The insulator (7) is a rectangular parallelepiped structure, and transition slopes are provided on the tops of the front and rear surfaces and on the left and right sides.

8. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The coil body comprises an iron core (1), a secondary winding (2) and a primary winding (3); the secondary winding (2) and the primary winding (3) are concentrically wound from the inside to the outside on an insulating frame and then sleeved on a core column of the iron core (1); the primary lead of the primary winding (3) is connected to the primary high-voltage terminal (5), and the secondary lead of the secondary winding (2) is connected to the secondary terminal.

9. The metal-armored high-voltage voltage transformer for EMU according to claim 1, characterized in that: The insulator (7) is arranged on a bottom plate (15), the bottom plate (15) is connected to the EMU, and the primary high-voltage insulating bushing (4) is butt-jointed with a primary connecting cable (16) on the EMU.

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