Relay transformer capable of resisting direct current magnetization interference
Patent Information
- Application Number
- CN202310856978.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-13
- Publication Date
- 2025-01-14
AI Technical Summary
The existing relay transformers have poor resistance to DC magnetization interference, especially in the 50Hz phase-sensitive track circuit and DC traction zone, which affects their normal operation.
The anti-DC magnetization function is added inside the relay transformer, and a C-type or E-type iron core is adopted, and fixedly installed through bolts, rivets, etc. to ensure the universality of the iron core and the interchangeability of the parts. Use appropriate materials to improve the magnetization saturation curve Height and anti-DC magnetization properties.
The anti-DC magnetization performance of the relay transformer is improved, and the high impedance characteristics are enhanced to prevent the rear-stage equipment from being impacted, ensuring its anti-interference ability and normal operation in the track circuit.
Smart Images
Figure CN119314785A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of relay transformers, in particular to a relay 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, relay transformers, rectifier transformers, etc. Generally, different transformers need to be selected according to the application of the transformer.
[0003] Since the existing relay transformers in China have poor anti-interference ability against DC magnetization, they are easily affected by DC magnetization interference when working, which affects the normal operation of the relay transformer; especially in 50Hz phase-sensitive track circuits and in DC traction areas, DC magnetization interference has a greater impact on the relay transformer. Summary of the invention
[0004] The purpose of the present invention is to provide a relay transformer with DC magnetization interference resistance in the existing device, and the advantage of the present invention is that the function of the relay transformer's DC magnetization resistance performance is improved.
[0005] The above technical purpose of the present invention is achieved through the following technical scheme: a relay transformer with resistance to DC magnetization interference, including a relay transformer, both sides of the top of the relay transformer are equipped with terminal blocks, and the front of the relay transformer is equipped with a transformer heat dissipation port.
[0006] The above technical solution is adopted: Taking into account the influence of DC traction current on the magnetization of relay transformer during operation in 50Hz phase-sensitive track circuit and in DC traction area, we are the first in China to add anti-DC magnetization function to the inside of relay transformer, thereby increasing the height of magnetization saturation curve of transformer and improving the anti-DC magnetization performance of transformer. This is the successful application of our technological innovation in anti-interference of track circuit. In summary, the high external impedance characteristic of transformer prevents the downstream equipment from being impacted, which is conducive to the normal operation of downstream equipment.
[0007] The present invention is further configured such that transformer mounting plates are installed on both sides of the bottom of the relay transformer.
[0008] The above technical solution makes it easy to fix and install the relay transformer by using bolts, rivets and other items and utilizing the mounting holes.
[0009] The present invention is further configured such that the iron core inside the relay transformer adopts a C-type iron core or an E-type disc-type iron core.
[0010] The above technical solution is adopted to improve the versatility of the iron core and facilitate the reliable installation between the relay transformer and the iron core.
[0011] The present invention is further configured such that the relay transformer, the connection terminal and the iron core inside the relay transformer are all universal parts with the same number.
[0012] By adopting the above technical solution, main parts of relay transformers of the same type can be used interchangeably, thereby improving practicality.
[0013] The present invention is further configured such that the iron core inside the relay transformer is made of cast iron, cast steel or silicon steel sheets.
[0014] By adopting the above technical solution, iron cores made of different materials can be selected according to the application of the relay transformer so as to meet the magnetization performance of the relay transformer.
[0015] The present invention is further configured such that when the primary side input of the relay transformer is 50 Hz 1 V when unloaded, the primary side excitation impedance should be 1 Ω to 1.5 Ω.
[0016] The above technical solution is adopted to meet the excitation impedance performance of the relay transformer under no-load when the primary side input is 50Hz1V.
[0017] The present invention is further configured such that when the relay transformer is unloaded and the primary side input is 50Hz1V and the secondary side is supplied with a DC of 70mA, the primary side excitation impedance should not be greater than 0.8Ω.
[0018] The above technical solution is adopted to meet the excitation impedance performance of the relay transformer under no-load when the primary side input is 50Hz1V and the secondary side is added with DC 70mA.
[0019] The present invention is further configured such that when the primary side input 50Hz of the relay transformer increases from 1V to 2V when unloaded, the impedance change should not exceed ±18%.
[0020] The above technical solution is adopted to meet the excitation impedance performance of the relay transformer under no-load when the primary side input 50Hz1V increases from 1V to 2V.
[0021] The present invention is further configured such that the primary side excitation impedance angle of the relay transformer should not be less than 75° when the relay transformer is unloaded.
[0022] The above technical solution is adopted to ensure the primary side excitation impedance angle when the relay transformer is unloaded.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] The present invention takes into account the influence of the 50Hz phase-sensitive track circuit and the DC traction current in the DC traction area on the magnetization of the relay transformer during operation. We are the first in China to add an anti-DC magnetization function to the inside of the relay 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
[0025] Figure 1 It is a schematic diagram of the structure of the relay transformer of the present invention;
[0026] Figure 2 It is a schematic diagram of the connection between the relay transformer winding and the corresponding terminal number of the present invention;
[0027] Figure 3 It is a circuit diagram of the same-name end test of the relay transformer of the present invention;
[0028] Figure 4 The electrical characteristic test circuit diagram of the relay transformer of the present invention;
[0029] Figure 5 A data value table is provided for the rated voltage values between the primary and secondary terminals of the relay transformer of the present invention;
[0030] Figure 6 This is the electrical characteristics table of the relay transformer of the present invention;
[0031] Figure 7 It is the magnetization curve diagram of the core of the relay transformer of the present invention.
[0032] In the figure: 1. Relay transformer; 2. Wiring terminals; 3. Transformer mounting plate; 4. Transformer heat dissipation port. DETAILED DESCRIPTION
[0033] 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.
[0034] Embodiment 1:
[0035] refer to Figure 1A relay transformer with resistance to DC magnetization interference includes a relay transformer 1. Terminals 2 are installed on both sides of the top of the relay transformer 1, and a transformer heat dissipation port 4 is installed on the front of the relay transformer 1. Taking into account the influence of the DC traction current on the magnetization of the relay transformer when it is working in a 50Hz phase-sensitive track circuit and in a DC traction area, we are the first in China to add an anti-DC magnetization function to the inside of the relay 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 conducive to the normal operation of the subsequent equipment.
[0036] refer to Figure 1 Transformer mounting plates 3 are installed on both sides of the bottom of the relay transformer 1, which facilitates the fixed installation of the relay transformer by using bolts, rivets and other items and utilizing the mounting holes.
[0037] refer to Figure 1 The iron core inside the relay transformer 1 adopts a C-type iron core or an E-type disc-type iron core, which improves the versatility of the iron core and facilitates the reliable installation between the relay transformer and the iron core.
[0038] refer to Figure 1 The relay transformer 1, the terminal block 2 and the iron core inside the relay transformer 1 are all universal parts with the same number, so that the main parts of the relay transformer of the same model can be used interchangeably, thereby improving practicality.
[0039] refer to Figure 1 The iron core inside the relay transformer 1 is made of cast iron, cast steel or silicon steel sheet. The iron core of different materials can be selected according to the application of the relay transformer to meet the magnetization performance of the relay transformer.
[0040] refer to Figure 1 When the relay transformer 1 is input 50Hz1V on the primary side at no-load, the primary side excitation impedance should be 1Ω~1.5Ω, which meets the excitation impedance performance of the relay transformer under no-load when the primary side input is 50Hz1V.
[0041] refer to Figure 1 When the relay transformer 1 is unloaded and the primary side input is 50Hz1V and the secondary side is DC 70mA, the primary side excitation impedance should not be greater than 0.8Ω, which meets the excitation impedance performance of the relay transformer under no-load when the primary side input is 50Hz1V and the secondary side is DC 70mA.
[0042] refer to Figure 1When the primary side input of the relay transformer 1 is 50Hz and increases from 1V to 2V under no-load condition, the impedance change should not exceed ±18%, meeting the excitation impedance performance of the relay transformer under no-load condition when the primary side input of the relay transformer is 50Hz1V and increases from 1V to 2V.
[0043] refer to Figure 1 , the primary side excitation impedance angle of relay transformer 1 should not be less than 75° when it is no-load, to ensure the primary side excitation impedance angle of relay transformer 1 when it is no-load.
[0044] Embodiment 2:
[0045] refer to Figure 5 , a relay transformer with resistance to DC magnetization interference, by setting the rated voltage value between the primary and secondary terminals of the relay transformer to the data value:
[0046] The no-load characteristics of the relay transformer are as follows:
[0047] 1. When the primary side input is 50Hz1V, the primary side excitation impedance should be 1Ω~1.5Ω;
[0048] 2. When the primary side input is 50Hz1V and the secondary side is added with DC 70mA, the primary side excitation impedance should not be greater than 0.8Ω;
[0049] 3. When the primary side input increases from 1V to 2V at 50Hz, the impedance changes of 1 and 2 mentioned above should not exceed ±18%; 4. The primary side excitation impedance angle should not be less than 75°.
[0050] At the same time, the relay transformer should work reliably under the following environmental conditions:
[0051] 1. Ambient air temperature: -40℃~+70℃;
[0052] 2. Relative humidity of surrounding air: not more than 90% (+25℃);
[0053] 3. Atmospheric pressure: not less than 70.1kPa (altitude not exceeding 3000m);
[0054] 4. Vibration frequency: 10Hz~200Hz, acceleration amplitude: 20m / s2(2g);
[0055] 5. There are no harmful gases or conductive dust around that may corrode metal, damage insulation, or cause explosion hazards.
[0056] The electrical characteristics of the relay transformer are shown in the table below: Figure 6 As shown:
[0057] Under the condition of 50Hz rated load, the voltage between the terminals of the secondary coil of the relay transformer should meet the requirements of the above diagram;
[0058] The magnetization curve of the relay transformer core is as follows: Figure 7 Shown 。
[0059] Embodiment 3:
[0060] refer to Figure 3 , with a relay transformer that is resistant to DC magnetization interference, connect the positive terminal of the DC voltmeter V to the I1 terminal of the transformer B, and the negative terminal to the II4 terminal of the transformer B. Adjust the DC power supply E to 6V, 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 terminal I1 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 relay transformer iron core (switch K cannot be turned on for a long time);
[0061] The test conditions for relay transformers are:
[0062] 1. Temperature: +15℃~+35℃;
[0063] 2.Relative humidity: 25%~75%;
[0064] 3. Air pressure: 86kPa~106kPa;
[0065] 4. The voltage fluctuation of the AC power supply for the test should not be less than 1%, and the waveform should be a sine wave (frequency 50Hz±1Hz);
[0066] 5. The accuracy of the test instrument should not be lower than Grade 1.
[0067] Among them, reference Figure 3 In the figure: R0 is a resistor 2W 10Ω~100Ω, E is a DC power supply 0~10V, V is a pointer-type DC voltmeter, B is the transformer under test, and K is a switch.
[0068] Embodiment 4:
[0069] refer to Figure 4 , a relay transformer with DC magnetization interference resistance, K1, K2, K3 (switch K1 can be omitted and completed with an ammeter), A, A1, Ur, Uo, U1, U2 are FLUKE-87 digital true RMS meters, R1, RL test resistors, E is a filter voltage regulator circuit, T is a voltage regulator 800W;
[0070] Disconnect switch K2, connect ammeter A in series to the primary side, adjust the relay transformer to make U1 = 1.0V, and the reading of Z = 1 / A should meet the requirements of the relay transformer electrical characteristic chart; adjust the relay transformer to make U1 = 2.0V, and the reading of Z = 2 / A should meet the requirements of the relay transformer electrical characteristic chart;
[0071] Connect the resistor R so that R≈1.0 / A (A is Figure 4 The measured value) adjusts the relay transformer to make U1 = 1.0V to measure the Uo and Ur values, and the phase angle 0 = cos-1 {(Uo2-Ur2-U12) / 2UrU1} should comply with the provisions of the relay transformer electrical characteristics chart);
[0072] Adjust the relay transformer so that when U1 = 1.0V, the voltage value between the terminals on the secondary side of the relay transformer should meet the requirements of the rated voltage value chart between the terminals on the primary and secondary sides of the relay transformer;
[0073] K3 is closed, and the relay transformer is adjusted to make U1 = 1.0V. In addition, T is adjusted to make A1 = 70mA, and Z = 1 / A, which should meet the requirements of the relay transformer electrical characteristics chart;
[0074] K2 is closed, and the relay transformer is adjusted to make U=1.0V. RL is adjusted to make RL=3KΩ. At this time, the voltage between the terminals of Ⅱ is measured respectively. The characteristics of the hysteresis curve below saturation are used. Following this principle, the characteristics below magnetic saturation are used to make the transformer work within the effective range, and measures are taken as much as possible to make the transformer work normally in an unsaturated state.
[0075] In summary, the high external impedance characteristics of the relay 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 relay transformer is increased, thereby improving the DC magnetization resistance of the relay transformer and improving the anti-interference ability of the relay transformer in the track circuit.
[0076] 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 relay transformer with DC magnetization interference resistance, comprising a relay transformer (1), characterized in that: Wiring terminals (2) are installed on both sides of the top of the relay transformer (1), and a transformer heat dissipation port (4) is installed on the front of the relay transformer (1).
2. The relay transformer with DC magnetization interference resistance according to claim 1 is characterized in that: Transformer mounting plates (3) are installed on both sides of the bottom of the relay transformer (1).
3. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: The iron core inside the relay transformer (1) is a C-type iron core or an E-type disc-type iron core.
4. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: The relay transformer (1), the connection terminal (2) and the iron core inside the relay transformer (1) are all universal parts with the same serial number.
5. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: The iron core inside the relay transformer (1) is made of cast iron, cast steel or silicon steel sheets.
6. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: When the relay transformer (1) is unloaded and the primary side input is 50 Hz 1 V, the primary side excitation impedance should be 1 Ω to 1.5 Ω.
7. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: When the relay transformer (1) is unloaded and the primary side input is 50Hz1V and the secondary side is supplied with a direct current of 70mA, the primary side excitation impedance should not be greater than 0.8Ω.
8. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: When the primary side input of the relay transformer (1) is increased from 1V to 2V at 50Hz under no-load condition, the impedance change should not exceed ±18%.
9. The relay transformer with DC magnetization interference resistance according to claim 1, characterized in that: The primary side excitation impedance angle of the relay transformer (1) should not be less than 75° when it is unloaded.