Track transformer capable of resisting direct current magnetization interference

Abstract

The invention relates to the technical field of rail transformers, and discloses a rail transformer with direct current magnetization interference resistance, which comprises a transformer shell, an iron core winding is mounted in the transformer shell, and a wiring terminal is mounted at the top of the transformer shell. The bottom of the wiring terminal is fixedly connected with a transformer winding which is in winding connection with the iron core winding; the anti-direct-current magnetization function is added to the interior of the track transformer in China for the first time, so that the magnetization saturation curve height of the transformer is increased, and the anti-direct-current magnetization performance of the transformer is improved, which is a successful application of technical innovation in anti-interference of a track circuit. And back-stage equipment is prevented from being impacted, and normal work of the back-stage equipment is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of track transformers, in particular to a track transformer capable of resisting direct current magnetization interference. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are primary coil, secondary coil and iron core (magnetic core). Its main function is to perform voltage conversion as the end of power transmission. There are many types of transformers, which are generally divided into power transformers, dry-type transformers, track transformers, rectifier transformers, etc. Generally, different transformers need to be selected according to the application of the transformer.

[0003] Since the existing track transformers in China have poor anti-interference ability against DC magnetization, the track transformers are easily interfered by DC magnetization during operation, which affects the normal use of the track transformers. Summary of the invention

[0004] The purpose of the present invention is to provide a track transformer with DC magnetization interference resistance in accordance with the existing device, and the advantage of the present invention is that the DC magnetization resistance of the transformer is improved.

[0005] The above technical purpose of the present invention is achieved through the following technical scheme: a track transformer with resistance to DC magnetization interference, including a transformer housing, an iron core winding is installed inside the transformer housing, a wiring terminal is installed on the top of the transformer housing, and the bottom of the wiring terminal is fixedly connected to a transformer winding wound with the iron core winding.

[0006] The above technical solution is adopted: considering the influence of DC traction current on the magnetization of the track transformer during operation, for the first time in China, an anti-DC magnetization function is added to the track transformer, thereby increasing the height of the transformer's magnetization saturation curve and improving the transformer's anti-DC magnetization performance. This is a successful application of our technological innovation in anti-interference of track circuits. In summary, the transformer's external high impedance characteristics prevent the subsequent equipment from being impacted, which is conducive to the normal operation of the subsequent equipment.

[0007] The present invention is further configured such that a transformer mounting base plate is installed at the bottom of the transformer housing, and the mounting hole size inside the transformer mounting base plate is: 145±0.5mm×86±0.5mm, 4 holes ψ5.

[0008] The above technical solution makes it easy to fix and install the track transformer by using bolts, rivets and other items and utilizing the mounting holes.

[0009] The present invention is further configured such that the transformer housing, the core winding, the connection terminals and the transformer windings are all universal parts of the same model.

[0010] The above technical solution enables the main components of different types of track transformers to be interchangeable, thereby improving practicality.

[0011] The present invention is further configured such that the core winding uses a C-type core and is consistent with the model of the transformer housing.

[0012] The above technical solution is adopted to facilitate the track transformer and the iron core to be securely installed.

[0013] The present invention is further configured such that the outer contour dimensions of the transformer housing are: 160mm×138mm×166mm, with an error of ±1mm.

[0014] The above technical solution is adopted to make the track transformer smaller in size and lighter in weight, reduce the occupied area during installation, and facilitate the installation of the track transformer.

[0015] The present invention is further configured such that the insulation resistance between the primary coil and the secondary coil of the core winding and between the core winding and the transformer housing and the transformer winding should not be less than 1000 MΩ.

[0016] The above technical solution is adopted to improve the working performance of the track transformer and improve its practicability.

[0017] The present invention is further configured such that the phase angle of the 50Hz 220V voltage applied to the primary side of each secondary winding of the core winding is not less than 75°.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention takes into account the influence of DC traction current on the magnetization of the track transformer during operation. For the first time in China, an anti-DC magnetization function is added to the track transformer, thereby increasing the height of the transformer's magnetization saturation curve and improving the transformer's anti-DC magnetization performance. This is a successful application of our technological innovation in anti-interference of track circuits. In summary, the transformer's external high impedance characteristics prevent the subsequent equipment from being impacted, which is beneficial to the normal operation of the subsequent equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the track transformer of the present invention;

[0021] Figure 2 It is a schematic diagram of the connection between the track transformer winding and the corresponding terminal number of the present invention;

[0022] Figure 3 This is a circuit diagram for testing the same-name end of the track transformer of the present invention;

[0023] Figure 4It is a circuit diagram for testing the no-load voltage between the secondary terminals of the track transformer of the present invention;

[0024] Figure 5 The table is a table of rated voltage values ​​between the primary and secondary terminals of the track transformer of the present invention;

[0025] Figure 6 The electrical characteristics table of the track transformer of the present invention;

[0026] Figure 7 It is the magnetization curve diagram of the track transformer core of the present invention.

[0027] In the figure: 1. Transformer casing; 2. Iron core winding; 3. Wiring terminals; 4. Transformer winding; 5. Transformer mounting base. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] refer to Figure 1 A track transformer with resistance to DC magnetization interference includes a transformer housing 1, an iron core winding 2 is installed inside the transformer housing 1, a wiring terminal 3 is installed on the top of the transformer housing 1, and a transformer winding 4 wound with the iron core winding 2 is fixedly connected to the bottom of the wiring terminal 3. Considering the influence of DC traction current on the magnetization of the track transformer during operation, for the first time in China, an anti-DC magnetization function is added to the inside of the track transformer, thereby increasing the height of the transformer's magnetization saturation curve and improving the transformer's anti-DC magnetization performance. This is a successful application of our technological innovation in track circuit anti-interference. In summary, the transformer's external high impedance characteristics prevent the subsequent equipment from being impacted, which is beneficial to the normal operation of the subsequent equipment.

[0031] refer to Figure 1 A transformer mounting base plate 5 is installed at the bottom of the transformer housing 1. The mounting hole size inside the transformer mounting base plate 5 is: 145±0.5mm×86±0.5mm, 4 holes ψ5, which is convenient for fixing the track transformer by using bolts, rivets and other items and using the mounting holes.

[0032] refer to Figure 1 The transformer housing 1, the core winding 2, the terminal block 3 and the transformer winding 4 are all universal parts of the same model, so that the main parts of the model track transformer can be used interchangeably, thereby improving practicality.

[0033] refer to Figure 1 The core winding 2 uses a C-type core and is consistent with the model of the transformer housing 1, so that the track transformer and the core can be securely installed.

[0034] refer to Figure 1 The outer contour dimensions of the transformer housing 1 are: 160mm×138mm×166mm, with an error of ±1mm, which makes the track transformer smaller in size and lighter in weight, reduces the occupied area during installation, and facilitates the installation of the track transformer.

[0035] refer to Figure 1 The insulation resistance between the primary coil and the secondary coil of the core winding 2 and between the transformer housing 1 and the transformer winding 4 should not be less than 1000MΩ, so as to improve the working performance and practicality of the track transformer.

[0036] refer to Figure 1 The phase angle of the 50Hz 220V voltage applied to the primary side of each secondary winding of the core winding 2 is not less than 75°.

[0037] Embodiment 2:

[0038] refer to Figure 2 and Figure 5 , a track transformer with resistance to DC magnetization interference, by setting the rated voltage values ​​between the primary and secondary terminals of the track transformer into a table:

[0039] At the same time, the secondary windings of the track transformer are open, and the no-load phase angle is not less than 75° when a 50Hz, 220V voltage is applied to the primary side. When the track transformer is connected to the DC magnetizing current and the secondary 12V terminal passes a DC current of 6A, the primary side current should not be greater than 320mA, so that the voltage between the secondary terminals of the track transformer meets the Figure 5 The error is not more than 10%, and under rated load conditions, that is, I 3-II 4 is short-circuited, I1-II6 output current is 10A, the secondary voltage should not be lower than Figure 5 80% of the prescribed value;

[0040] At the same time, the track transformer should work reliably under the following environmental conditions:

[0041] 1. Ambient air temperature: -40℃~~+70℃ (outdoor).

[0042] 2. Relative humidity of air: not more than 90% (+25℃).

[0043] 3. Atmospheric pressure: not less than 70.1KPa (altitude not exceeding 3000m).

[0044] 4. Vibration: frequency 10Hz~~200Hz, peak acceleration: 20m / s3(2g);

[0045] Under normal test atmospheric conditions, the insulation resistance between the primary coil and the secondary coil of the transformer, and between the primary coil, the secondary coil and other metal parts (iron core, shell) should not be less than 100OMQ;

[0046] Under the condition of atmospheric pressure not less than 89.9KPa (equivalent to an altitude of less than 1000m), the insulation withstand voltage between each coil and between each coil core should be able to withstand the AC sine wave 50Hz1500V effective value voltage, and there should be no breakdown or flashover phenomenon for 2min. During the test, the leakage current should not be higher than 20mA. This test is generally allowed to be carried out only once. When repeating the test, the voltage should be 85% of the original test voltage value, and the factory test time is 1s;

[0047] When the secondary windings of the track transformer are open and a 50Hz, 220V voltage is applied to the primary side, the following requirements shall be met:

[0048] 1. The no-load phase angle of the primary side is not less than 75°;

[0049] 2. DC magnetizing current: When the DC current of 10A flows through the 12V terminal on the secondary side, the current on the primary side should not exceed 450mA;

[0050] 3. The voltage between the secondary terminals meets Figure 5 The error of the specified value shall not exceed 20%;

[0051] When the transformer is under rated load conditions, that is, I3-II4 are short-circuited and II1-II 6 output current is 10A, the secondary side voltage should not be lower than 80% of the value specified in Table 1.

[0052] The electrical characteristics of the track transformer are shown in the table below: Figure 6 :

[0053] The magnetization curve of the track transformer core is as follows: Figure 7 .

[0054] Embodiment 3:

[0055] refer to Figure 3, a track transformer with resistance to DC magnetization interference, connect the positive terminal of the DC voltmeter V to the II1 terminal of the transformer B, and the negative terminal to the Ⅱ6 terminal of the transformer B. Adjust the DC power supply E to 10v, when the switch K is turned on, the pointer of the DC voltmeter moves in the direction of increase; when the switch K is turned off, the pointer of the DC voltmeter moves in the direction of decrease, then the transformer coil terminals Ⅱ1 and Ⅰ1 connected to the positive terminal of the DC voltmeter and the positive pole of the power supply are the same-name terminals; the same-name terminals of the coil should comply with the provisions of the magnetization curve diagram of the track transformer core (switch K cannot be turned on for a long time);

[0056] The test conditions are as follows: temperature is 20℃~40℃; relative humidity is 15%-95%; air pressure is 76kPa-96kPa;

[0057] The voltage fluctuation of the AC power supply for the test should not be greater than 15%, and the waveform should be a sine wave (frequency 50Hz±5Hz);

[0058] The accuracy of the test instrument shall not be lower than Class 1;

[0059] At the same time, in the no-load characteristic test of the track transformer: disconnect switch K., close Ka, connect the 12V terminal of the secondary side, connect the ammeter A in series to the primary side, adjust T so that U, = 220V, and then adjust TQ so that Ax = 10A, the reading of A should meet the requirements that when the DC current of 10A is passed through the 12V terminal of the secondary side, the current of the primary side should not be greater than 450mA;

[0060] Track transformer single no-load phase angle measurement: connect resistor R to make R ~ 220 / A (A is the value measured in 6.2.1.1) adjust T to make U, = 220V to measure Uo, Ur values, phase angle θ = cos-1 {(Uo2-Ur2-U, 2) / 2UrU,} should meet the requirement that the no-load phase angle of the primary side is not less than 75°;

[0061] Measurement of no-load voltage between the secondary terminals of the track transformer: When T is adjusted so that U = 220V, the voltage value between the terminals on the secondary side should meet the voltage between the terminals on the secondary side. Figure 5 The error of the specified value shall not exceed 20%.

[0062] Embodiment 4:

[0063] refer to Figure 4 , T, TQ - autotransformer 1KVA, K1, K2, K3 (switch K, can be omitted, use the meter to complete the connection). A, A,, Ur, Uo, U,, U2 are FLUKE-87 type digital true effective value meter, Ri, RL test resistors, E filter voltage stabilization circuit;

[0064] In summary, the high external impedance characteristics of the track transformer prevent the downstream equipment from being impacted, which is beneficial to the normal operation of the downstream equipment. In addition, since the influence of DC traction current on the magnetization of the transformer is taken into consideration, the height of the magnetization saturation curve of the track transformer is increased, thereby improving the DC magnetization resistance of the track transformer and improving the anti-interference ability of the track transformer in the track circuit.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A track transformer with DC magnetization interference resistance, comprising a transformer housing (1), characterized in that: An iron core winding (2) is installed inside the transformer housing (1), a connection terminal (3) is installed on the top of the transformer housing (1), and a transformer winding (4) wound around the iron core winding (2) is fixedly connected to the bottom of the connection terminal (3).

2. The track transformer with DC magnetization interference resistance according to claim 1 is characterized in that: A transformer mounting base plate (5) is installed at the bottom of the transformer housing (1), and the mounting hole size inside the transformer mounting base plate (5) is: 145±0.5mm×86±0.5mm, 4 holes ψ5.

3. The track transformer with DC magnetization interference resistance according to claim 1 is characterized in that: The transformer housing (1), the iron core winding (2), the connection terminal (3) and the transformer winding (4) are all universal parts of the same model.

4. The track transformer with DC magnetization interference resistance according to claim 1 is characterized in that: The iron core winding (2) is a C-shaped iron core and has the same model as the transformer housing (1).

5. The track transformer with DC magnetization interference resistance according to claim 1 is characterized in that: The outer dimensions of the transformer housing (1) are: 160 mm×138 mm×166 mm, with an error of ±1 mm.

6. The track transformer with DC magnetization interference resistance according to claim 1, characterized in that: The insulation resistance between the primary coil and the secondary coil of the iron core winding (2) and between the transformer housing (1) and the transformer winding (4) should not be less than 1000 MΩ.

7. The track transformer with DC magnetization interference resistance according to claim 1, characterized in that: The phase angle of the 50Hz220V voltage applied to the primary side of each secondary winding of the core winding (2) is not less than 75°.

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