Transformer with soft start mode
By setting up a soft start mechanism inside the transformer's transformer's transformer box to control the starting current, the problem of circuit breaker tripping caused by excessive transformer startup current is solved, and the normal start of the transformer and the service life of the circuit breaker are achieved.
Patent Information
- Application Number
- CN202420666128.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The transformer's own impedance is too small, resulting in too large starting current, causing the circuit breaker to trip, the transformer cannot start normally, and consumes the service life of the circuit breaker.
Design a soft start transformer, and control the start current of the transformer by setting a soft start mechanism inside the transformer box, including resistors, time relays, power cutters and AC contactors, to prevent the circuit breaker from tripping.
It effectively reduces the starting current of the transformer, avoids the circuit breaker trip, ensures the normal start of the transformer, and extends the service life of the circuit breaker.
Smart Images
Figure CN222672787U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to a transformer with a soft start mode. Background Art
[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, the secondary coil and the iron core. In electrical equipment and wireless circuits, it is often used to increase or decrease voltage, match impedance, and provide safety isolation. In a generator, whether the coil moves through a magnetic field or the magnetic field moves through a fixed coil, an electric potential can be induced in the coil. In both cases, the value of the magnetic flux remains unchanged, but the amount of magnetic flux intersecting the coil changes. This is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current and impedance.
[0003] The starting method is hard start, which means that the input end of the transformer is connected to the lower end of the circuit breaker, and the upper end of the circuit breaker is connected to the grid side; as long as the circuit breaker is closed, the transformer will be powered on and started directly; but this approach also has disadvantages. If the transformer's own impedance is too small, the transformer's starting current will be very large, which will cause the circuit breaker to trip at the moment of closing, resulting in the transformer being unable to power on, and also consuming the service life of the circuit breaker. Utility Model Content
[0004] In order to make up for the shortcomings of the prior art, if the transformer's own impedance is too small, the transformer starting current will be very large, which will cause the circuit breaker to trip at the moment of closing, resulting in the transformer being unable to power on and also consuming the service life of the circuit breaker. The utility model proposes a transformer with a soft start method.
[0005] The utility model solves the technical problem by adopting the following technical solution: a transformer with soft start mode, comprising a transformer box, heat sinks are fixedly installed on both sides of the transformer box, a transformer assembly is fixedly installed on the inner wall of the transformer box, a connecting plate is fixedly installed on the top of the transformer assembly, an outlet terminal is fixedly installed on the top of the transformer box, and a soft start mechanism is arranged inside the transformer box;
[0006] The soft start structure includes a resistor, which is fixedly installed on the top of the connecting plate, the output end of the outlet terminal is electrically connected to the input end of the resistor, a time relay is fixedly installed on one side of the connecting plate, the output end of the connecting plate is electrically connected to the input end of the time relay, a breaker is fixedly installed on one side of the connecting plate, the output end of the time relay is electrically connected to the input end of the breaker, an AC contactor is fixedly installed on the inner wall of the transformer box, the output end of the breaker is electrically connected to the input end of the AC contactor, a current sensor is fixedly installed on one side of the time relay, and the output end of the current sensor is electrically connected to the input end of the time relay.
[0007] Preferably, a support plate is fixedly installed on the top of the heat sink, a placement groove is provided at the bottom of the support plate, a movable plate is slidably connected to the inner cavity of the placement groove, a sliding groove is provided on one side of the movable plate, a scraper is slidably connected to the inner cavity of the sliding groove, and the surface of the scraper contacts the surface of the heat sink.
[0008] Preferably, a connecting rod is fixedly mounted on the inner wall of the placement groove, and the inner wall of the movable plate is slidably connected to the surface of the connecting rod.
[0009] Preferably, a slot is provided on the top of the movable plate, a support rod is fixedly mounted on the inner wall of the slot, an elastic clip is fixedly mounted in the inner cavity of the placement slot, and the surface of the support rod contacts the inner side of the elastic clip.
[0010] Preferably, foot pads are fixedly mounted on the bottom of the transformer box, and the number of the foot pads is four.
[0011] Preferably, a docking groove is provided on the top of the movable plate, a docking block is fixedly mounted on one side of the scraper, and an inner cavity of the docking groove is slidably connected to the surface of the docking block.
[0012] Preferably, a fixing groove is provided on the inner wall of the docking groove, a push rod is threadedly connected to the inner wall of the movable plate, a positioning ball is slidably connected to the inner cavity of the fixing groove, a positioning groove is provided on one side of the docking block, and the surface of the positioning ball is slidably connected to the inner cavity of the positioning groove.
[0013] The utility model is beneficial in that:
[0014] The utility model sets a soft start mechanism, and the starting mode belongs to soft start, which is mainly controlled by an AC contactor, a resistor and a time relay. The fuse mainly plays a protective role for these electronic components, and the power line is mainly responsible for connecting them to form a complete control loop. Compared with the previous series reactor, the utility model has the effects of low cost, easy production, easy installation and light weight. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 It is a structural schematic diagram of the utility model;
[0017] Figure 2It is a structural schematic diagram of the soft start mechanism of the utility model;
[0018] Figure 3 For the utility model Figure 2 The enlarged view of point A in the middle;
[0019] Figure 4 It is a schematic diagram of the support plate and the moving structure of the utility model;
[0020] Figure 5 It is a structural schematic diagram of the card slot and the support rod of the utility model;
[0021] Figure 6 For the utility model Figure 5 The enlarged view of point B in the middle;
[0022] Figure 7 It is a structural schematic diagram of the foot pad of the utility model.
[0023] In the figure: 1. Transformer box; 2. Heat sink; 3. Transformer assembly; 4. Connecting plate; 5. Outlet terminal; 6. Soft start mechanism; 601. Resistor; 602. Time relay; 603. Circuit breaker; 604. AC contactor; 605. Current sensor; 7. Support plate; 8. Placement slot; 9. Moving plate; 10. Sliding slot; 11. Scraper; 12. Connecting rod; 13. Card slot; 14. Support rod; 15. Elastic clip; 16. Foot pad; 17. Docking slot; 18. Docking block; 19. Fixing slot; 20. Push rod; 21. Positioning slot; 22. Positioning ball. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] The following is combined with Figure 1-7 To further explain this application in detail,
[0026] The present application embodiment discloses a transformer with a soft start mode. Figure 2 and Figure 3 A transformer with a soft start mode includes a transformer box 1, heat sinks 2 are fixedly installed on both sides of the transformer box 1, a transformer assembly 3 is fixedly installed on the inner wall of the transformer box 1, a connecting plate 4 is fixedly installed on the top of the transformer assembly 3, an outlet terminal 5 is fixedly installed on the top of the transformer box 1, and a soft start mechanism 6 is arranged inside the transformer box 1;
[0027] The soft start structure includes a resistor 601, which is fixedly installed on the top of the connecting plate 4, and the input end of the output terminal 5 is electrically connected to the input end of the resistor 601. A time relay 602 is fixedly installed on one side of the connecting plate 4, and the output end of the connecting plate 4 is electrically connected to the input end of the time relay 602. A breaker 603 is fixedly installed on one side of the connecting plate 4, and the output end of the time relay 602 is electrically connected to the input end of the breaker 603. An AC contactor 604 is fixedly installed on the inner wall of the transformer box 1, and the output end of the breaker 603 is electrically connected to the input end of the AC contactor 604. A current sensor 605 is fixedly installed on one side of the time relay 602, and the input end of the current sensor 605 is electrically connected to the input end of the time relay 602.
[0028] Reference Figure 1 and Figure 4 A support plate 7 is fixedly installed on the top of the heat sink 2, and a placement groove 8 is provided at the bottom of the support plate 7. A moving plate 9 is slidably connected to the inner cavity of the placement groove 8. A sliding groove 10 is provided on one side of the moving plate 9. A scraper 11 is slidably connected to the inner cavity of the sliding groove 10. The surface of the scraper 11 contacts the surface of the heat sink 2. By setting the support plate 7, the moving plate 9 and the scraper 11 for coordinated use, the user pulls the handle downward to drive the moving plate 9 to move downward through the handle, so that the moving plate 9 slides downward in the inner cavity of the placement groove 8. During the movement, the scraper 11 will contact the surface of the heat sink 2, and the scraper 11 is used to clean the surface of the heat sink 2 to prevent a large amount of dust from adhering to the surface of the heat sink 2, thereby ensuring the normal heat dissipation capacity of the heat sink 2;
[0029] Reference Figure 4 A connecting rod 12 is fixedly installed on the inner wall of the placement groove 8, and the inner wall of the movable plate 9 is slidably connected to the surface of the connecting rod 12. Through the sliding connection between the connecting rod 12 and the movable plate 9, the sliding of the movable plate 9 in the inner cavity of the sliding groove 10 can be guided, so that the movable plate 9 remains vertical and moves downward;
[0030] Reference Figure 4 A card slot 13 is provided at the top of the movable plate 9, a support rod 14 is fixedly installed on the inner wall of the card slot 13, and an elastic clip 15 is fixedly installed in the inner cavity of the placement slot 8. The surface of the support rod 14 contacts the inner side of the elastic clip 15. Through the contact between the elastic clip 15 and the support rod 14, when the movable plate 9 is completely moved to the top inner cavity of the placement slot 8, the elastic clip 15 will enter the inner cavity of the card slot 13 and contact the support rod 14. The position of the support rod 14 is fixed by the elastic clip 15, so as to fix the position of the movable plate 9 and prevent the movable plate 9 from moving out of the inner cavity of the placement slot 8 when it is not working.
[0031] Reference Figure 7The bottom of the transformer box 1 is fixedly provided with foot pads 16, and the number of foot pads 16 is four. By providing the foot pads 16, the contact area between the transformer box 1 and the ground can be reduced, the corrosion between the ground and the bottom of the transformer box 1 can be reduced, and the service life of the transformer box 1 can be increased;
[0032] Reference Figure 4 and Figure 5 A docking groove 17 is provided on the top of the movable plate 9, and a docking block 18 is fixedly installed on one side of the scraper 11. The inner cavity of the docking groove 17 is slidably connected to the surface of the docking block 18. Through the sliding connection between the docking groove 17 and the docking block 18, the installation of the scraper 11 can be guided so that the scraper 11 can enter the inner cavity of the sliding groove 10, ensuring that the scraper 11 can contact the heat sink 2;
[0033] Reference Figure 6 A fixing groove 19 is provided on the inner wall of the docking groove 17, a push rod 20 is threadedly connected to the inner wall of the movable plate 9, a positioning ball 22 is slidably connected to the inner cavity of the fixing groove 19, a positioning groove 21 is provided on one side of the docking block 18, the surface of the positioning ball 22 is slidably connected to the inner cavity of the positioning groove 21, and the push rod 20 is rotated through the sliding connection between the positioning ball 22 and the positioning groove 21, and the pushing rod 20 is moved downward to squeeze the positioning ball 22, so that the positioning ball 22 moves in the inner cavity of the fixing groove 19 and enters the inner cavity of the positioning groove 21, thereby fixing the position of the docking block 18, thereby fixing the position of the scraper 11;
[0034] Working principle: When the circuit breaker is closed, in an instant, the power grid supplies power to the transformer through the resistor 601 to open the transformer's magnetic field. Due to the voltage drop caused by the resistor 601, the starting current of the transformer is limited; then in the same time period, the coil gap of the time relay 602 is closed, and the current is sensed by the current sensor 605. After a 1-second delay, the normally open contact of the time relay 602 is closed, and then the coil of the AC contactor 604 is closed, and finally the AC contactor 604 is closed; at the same time, at the moment when the AC contactor 604 is closed, the normally closed contact of the AC contactor 604 is disconnected through the breaker 603 to cut off the power to the time relay 602, and the normally open contact of the AC contactor 604 is closed to continuously supply power to the coil of the AC contactor 604 to ensure the closed state of the AC contactor 604.
[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. A transformer with a soft start mode, characterized in that: The invention comprises a transformer box (1), heat dissipation plates (2) are fixedly mounted on both sides of the transformer box (1), a transformer assembly (3) is fixedly mounted on the inner wall of the transformer box (1), a connection plate (4) is fixedly mounted on the top of the transformer assembly (3), an outlet terminal (5) is fixedly mounted on the top of the transformer box (1), and a soft start mechanism (6) is arranged inside the transformer box (1); The soft start mechanism (6) comprises a resistor (601), the resistor (601) is fixedly mounted on the top of the connecting plate (4), the output end of the output terminal (5) is electrically connected to the input end of the resistor (601), a time relay (602) is fixedly mounted on one side of the connecting plate (4), the output end of the connecting plate (4) is electrically connected to the input end of the time relay (602), a circuit breaker (603) is fixedly mounted on one side of the connecting plate (4), the output end of the time relay (602) is electrically connected to the input end of the circuit breaker (603), an AC contactor (604) is fixedly mounted on the inner wall of the transformer box (1), the output end of the circuit breaker (603) is electrically connected to the input end of the AC contactor (604), and a current sensor (605) is fixedly mounted on one side of the time relay (602), the output end of the current sensor (605) is electrically connected to the input end of the time relay (602).
2. The transformer with a soft start mode according to claim 1, characterized in that: A support plate (7) is fixedly mounted on the top of the heat sink (2); a placement groove (8) is provided at the bottom of the support plate (7); a moving plate (9) is slidably connected to the inner cavity of the placement groove (8); a sliding groove (10) is provided on one side of the moving plate (9); a scraper (11) is slidably connected to the inner cavity of the sliding groove (10); and the surface of the scraper (11) is in contact with the surface of the heat sink (2).
3. The transformer with a soft start mode according to claim 2, characterized in that: A connecting rod (12) is fixedly mounted on the inner wall of the placement groove (8), and the inner wall of the movable plate (9) is slidably connected to the surface of the connecting rod (12).
4. The transformer with a soft start mode according to claim 2, characterized in that: A card slot (13) is provided on the top of the movable plate (9), a support rod (14) is fixedly mounted on the inner wall of the card slot (13), an elastic clip (15) is fixedly mounted in the inner cavity of the placement slot (8), and the surface of the support rod (14) is in contact with the inner side of the elastic clip (15).
5. The transformer with a soft start mode according to claim 1, characterized in that: A foot pad (16) is fixedly mounted on the bottom of the transformer box (1), and the number of the foot pads (16) is four.
6. The transformer with a soft start mode according to claim 2, characterized in that: A docking groove (17) is provided on the top of the movable plate (9), a docking block (18) is fixedly mounted on one side of the scraper (11), and the inner cavity of the docking groove (17) is slidably connected to the surface of the docking block (18).
7. The transformer with a soft start mode according to claim 6, characterized in that: The inner wall of the docking groove (17) is provided with a fixing groove (19), the inner wall of the movable plate (9) is threadedly connected with a push rod (20), the inner cavity of the fixing groove (19) is slidably connected with a positioning ball (22), and one side of the docking block (18) is provided with a positioning groove (21), and the surface of the positioning ball (22) is slidably connected with the inner cavity of the positioning groove (21).