Voltage balancing device of 10KV three-element combined mutual inductor and use method of voltage balancing device

Abstract

The invention discloses a voltage balancing device of a 10KV three-element combined mutual inductor and a using method of the voltage balancing device, and relates to the technical field of mutual inductors. The voltage balancing device of the 10KV three-element combined mutual inductor comprises a first mutual inductor shell, the voltage balancing device comprises a second mutual inductor shell, a voltage mutual inductor is installed in the first mutual inductor shell, and a current mutual inductor is installed in the second mutual inductor shell. The front end of the first mutual inductor shell is fixedly connected with a mutual inductor junction box, a voltage stabilizer is installed outside the first mutual inductor shell, and by means of Y-shaped connection of a secondary winding of the voltage mutual inductor and use of a circuit breaker and the voltage stabilizer, voltage balance of the voltage mutual inductor is facilitated; the Y-shaped connection can guarantee three-phase balance while providing a stable power supply, has an effect of absorbing harmonic waves, improves the power supply efficiency, avoids equipment damage caused by overload, and guarantees good operation of low-voltage power grid protection.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductors, and in particular to a voltage balancing device of a 10KV three-element combined mutual inductor and a use method thereof. Background Art

[0002] When measuring civil or industrial electricity, a transformer is used to convert voltage and current into standard low voltage and standard small current. Currently, a current transformer and a voltage transformer are commonly used to form a combined transformer.

[0003] In order to eliminate the three-phase voltage imbalance, the residual voltage coils of the three voltage transformers of the JZZY1-10 combination transformer are connected to form a closed triangle. In the steady state, the three-phase voltages are symmetrical, and the open-angle circuit has no voltage and can be short-circuited. At the same time, the closed triangle can eliminate the zero-sequence flux (including the third harmonic), which can cause the three-phase voltage imbalance and the relay circuit voltage to exceed the standard during normal operation. For this reason, the present invention proposes a new solution. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a balanced voltage device of a 10KV three-element combination transformer and a method of using the device, which can solve the problem that a closed triangle can eliminate zero-sequence magnetic flux (including third harmonics), while zero-sequence magnetic flux can cause unbalanced three-phase voltage in normal operation and excessive voltage in the relay circuit.

[0005] To achieve the above object, the present invention provides the following technical solution: A voltage balancing device for a 10KV three-element combination transformer, comprising a first transformer housing;

[0006] A voltage balancing device, the voltage balancing device is arranged on the first transformer housing, the voltage balancing device comprises a second transformer housing, the second transformer housing is fixedly connected to the upper end of the first transformer housing, a voltage transformer is installed inside the first transformer housing, and a current transformer is installed inside the second transformer housing;

[0007] A transformer junction box is fixedly connected to the front end of the first transformer housing, a plurality of first wiring terminals and a plurality of second wiring terminals are fixedly connected inside the transformer junction box, a first grounding terminal and a second grounding terminal are fixedly connected inside the transformer junction box, and a voltage stabilizer is installed outside the first transformer housing.

[0008] Preferably, a second insulator is fixedly connected to the surface of the second transformer housing, and two transformer porcelain bushings are symmetrically fixedly connected to the surface of the second transformer housing, and the two transformer porcelain bushings are both inclined;

[0009] The surfaces of the two transformer porcelain bushings are fixedly connected with third insulators, the interiors of the two transformer porcelain bushings are fixedly connected with first terminals, and the surfaces of the two transformer porcelain bushings are sleeved with insulating sleeves;

[0010] There are three second transformer housings, all of which are arranged on the first transformer housing.

[0011] Preferably, a first insulator is fixedly connected to the surface of the first transformer housing.

[0012] Preferably, the components of the first transformer housing and the second transformer housing are encapsulated by epoxy integral casting.

[0013] Preferably, a transformer mounting frame is provided at the lower end of the first transformer housing, the internal thread of the transformer mounting frame is connected with two first fixing bolts, and the transformer mounting frame is fixed to the first transformer housing through the two first fixing bolts;

[0014] The surface of the transformer mounting frame is threadedly connected with two lifting rings, and the surface of the transformer mounting frame is fixedly connected with two handles;

[0015] There are two groups of first fixing bolts, lifting rings, transformer mounting frames and handles, which are symmetrically arranged at the bottom of the first transformer housing.

[0016] Preferably, two mounting frame connecting cylinders and two mounting frame connecting rods are respectively fixedly connected to the surfaces of the two transformer mounting frames, and a plurality of through holes are respectively opened on the surfaces of the two mounting frame connecting cylinders and the two mounting frame connecting rods, and the two mounting frame connecting cylinders are respectively slidably connected to the corresponding mounting frame connecting rods;

[0017] The corresponding through holes are threadedly connected with second fixing bolts, and the two mounting frame connecting tubes and the corresponding mounting frame connecting rods are fixed by the second fixing bolts.

[0018] A method for using a balanced voltage of a 10KV three-element combination transformer comprises the following steps:

[0019] S1: The primary windings of the current transformer are connected in series to the three-phase power lines, the secondary windings are in Y shape, the ABC three-phase wires are connected to the primary windings of the voltage transformer, the common points of the primary windings are connected, and the secondary windings are in Y shape;

[0020] S2: The common point of the secondary winding of the current transformer is connected to the first grounding terminal, the output ends of the secondary winding of the current transformer are respectively connected to the corresponding first wiring terminals, the current ratio of the current transformer is 1:A, and the ammeter is connected in series with the corresponding first wiring terminal and the first grounding terminal;

[0021] S3: The common point of the voltage transformer is connected to the second grounding terminal, the other end of the secondary winding of the voltage transformer is connected to the second terminal, the voltage ratio of the voltage transformer is: V, and the three output ends of the secondary winding of the voltage transformer are connected to the corresponding second terminals, the three second terminals are connected to the input end of the voltage regulator after the circuit breaker, and the load is connected to the output end of the voltage regulator.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The method of using the balanced voltage of the 10KV three-element combination transformer is to balance the voltage of the transformer through the Y-type connection of the secondary winding of the voltage transformer and the use of circuit breakers and voltage stabilizers. The Y-type connection can ensure three-phase balance while providing a stable power supply and has the effect of absorbing harmonics. The output voltage balance of the transformer can reduce the loss of lines and equipment, improve power supply efficiency, avoid equipment damage caused by load overload, ensure the good operation of low-voltage power grid protection, and improve the detection accuracy of voltage in the power grid.

[0024] 2. The balanced voltage device of the 10KV three-element combination transformer facilitates the fixing of the transformer mounting frame and the first transformer housing by adjusting the spacing of the transformer mounting frame. The appropriate spacing can ensure that the transformer is more stable during installation, avoid loosening or displacement of the installation due to improper spacing, improve the practicality of the transformer mounting frame, improve the safety of the transformer, and improve the flexibility and convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 It is a structural schematic diagram of a voltage balancing device of a 10KV three-element combined mutual inductor and a method of using the same according to the present invention;

[0027] Figure 2 This is a schematic diagram of a porcelain bushing of a mutual inductor according to the present invention;

[0028] Figure 3 This is a schematic diagram of a transformer junction box of the present invention;

[0029] Figure 4 is a schematic diagram of a current transformer of the present invention;

[0030] Figure 5 It is a schematic diagram of a voltage transformer of the present invention;

[0031] Figure 6 It is a wiring diagram of the transformer of the present invention.

[0032] Figure numerals: 1. first transformer housing; 2. second transformer housing; 3. transformer porcelain bushing; 4. insulating sleeve; 5. first terminal; 6. first insulator; 7. second insulator; 8. third insulator; 9. voltage transformer; 10. current transformer; 11. first fixing bolt; 12. lifting ring; 13. transformer junction box; 14. first terminal; 15. first grounding terminal; 16. second terminal; 17. second grounding terminal; 18. transformer mounting frame; 19. mounting frame connecting tube; 20. mounting frame connecting rod; 21. through hole; 22. second fixing bolt; 23. handle. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] See also Figure 1-6The present invention provides a technical solution: a balanced voltage device of a 10KV three-element combination transformer, comprising a first transformer housing 1, a voltage balancing device, the voltage balancing device being arranged on the first transformer housing 1, the voltage balancing device comprising a second transformer housing 2, the second transformer housing 2 being fixedly connected to the upper end of the first transformer housing 1, a voltage transformer 9 being installed inside the first transformer housing 1, a current transformer 10 being installed inside the second transformer housing 2, a transformer junction box 13 being fixedly connected to the front end of the first transformer housing 1, a plurality of first wiring terminals 14 and a plurality of second wiring terminals 16 being fixedly connected inside the transformer junction box 13, a first grounding terminal 15 and a second grounding terminal 17 being fixedly connected inside the transformer junction box 13, and a voltage stabilizer being installed outside the first transformer housing 1.

[0038] A second insulator 7 is fixedly connected to the surface of the second transformer housing 2. Two transformer porcelain bushings 3 are symmetrically fixedly connected to the surface of the second transformer housing 2. The two transformer porcelain bushings 3 are both inclined. A third insulator 8 is fixedly connected to the surfaces of the two transformer porcelain bushings 3. The insides of the two transformer porcelain bushings 3 are fixedly connected to the first terminal 5. The surfaces of the two transformer porcelain bushings 3 are sleeved with insulating sleeves 4. There are three second transformer housings 2, all of which are arranged on the first transformer housing 1.

[0039] A first insulator 6 is fixedly connected to the surface of the first transformer housing 1 .

[0040] The components of the first transformer housing 1 and the second transformer housing 2 are encapsulated by epoxy integral casting.

[0041] A transformer mounting frame 18 is provided at the lower end of the first transformer housing 1. Two first fixing bolts 11 are connected to the inner thread of the transformer mounting frame 18. The transformer mounting frame 18 is fixed to the first transformer housing 1 through the two first fixing bolts 11. Two lifting rings 12 are connected to the surface of the transformer mounting frame 18 through threads. Two handles 23 are fixedly connected to the surface of the transformer mounting frame 18. There are two groups of first fixing bolts 11, lifting rings 12, transformer mounting frames 18 and handles 23, which are symmetrically arranged at the bottom of the first transformer housing 1. Two mounting frame connecting cylinders 19 and two mounting frame connecting rods 20 are fixedly connected to the surfaces of the two transformer mounting frames 18 respectively. A plurality of through holes 21 are respectively provided on the surfaces of the two mounting frame connecting cylinders 19 and the two mounting frame connecting rods 20. The two mounting frame connecting cylinders 19 are respectively slidably connected to the corresponding mounting frame connecting rods 20. The corresponding through holes 21 are threadedly connected with second fixing bolts 22. The two mounting frame connecting cylinders 19 and the corresponding mounting frame connecting rods 20 are fixed by the second fixing bolts 22.

[0042] A method for using the balanced voltage of a 10KV three-element combination current transformer comprises the following steps:

[0043] S1: The primary winding of the current transformer 10 is connected in series to the three-phase power line, the secondary winding adopts a Y shape, the ABC three-phase wires are connected to the primary winding of the voltage transformer 9, the common point of the primary windings is connected, and the secondary winding adopts a Y shape;

[0044] S2: The common point of the secondary winding of the current transformer 10 is connected to the first grounding terminal 15, and the output ends of the secondary winding of the current transformer 10 are respectively connected to the corresponding first wiring terminals 14. The current ratio of the current transformer 10 is 100:5A. The ammeter is connected in series with the corresponding first wiring terminal 14 and the first grounding terminal 15.

[0045] S3: The common point of the voltage transformer 9 is connected to the second grounding terminal 17, and the other end of the secondary winding of the voltage transformer 9 is connected to the second terminal 16. The voltage ratio of the voltage transformer 9 is 10000:100V, and the three output ends of the secondary winding of the voltage transformer 9 are connected to the corresponding second terminals 16. The three second terminals 16 are connected to the input end of the voltage regulator after the circuit breaker, and the load is connected to the output end of the voltage regulator.

[0046] When using the transformer, first adjust the spacing between the two transformer mounting frames 18 according to the specifications of the first transformer housing 1, and insert the mounting frame connecting rod 20 into the corresponding mounting frame connecting tube 19, use the first fixing bolt 11 to fix the transformer mounting frame 18 to the first transformer housing 1, and use the second fixing bolt 22 to fix the mounting frame connecting tube 19 to the corresponding mounting frame connecting rod 20, so as to facilitate the installation of the first transformer housing 1. At the same time, the setting of the lifting ring 12 and the handle 23 facilitates the transfer of the first transformer housing 1 using lifting equipment, thereby improving the flexibility and convenience of the device. At the same time, by adjusting the spacing between the two transformer mounting frames 18, the appropriate spacing can ensure that the transformer is more stable during installation, avoid loosening or displacement of the installation due to improper spacing, improve the practicality of the transformer mounting frame 18, and improve the safety of the transformer.

[0047] By using the first insulator 6, the second insulator 7 and the third insulator 8, the insulation effect of the mutual insulator can be improved. The insulator has good insulation performance and can effectively prevent the current from passing through, thereby ensuring the safe and reliable operation of the mutual insulator. At the same time, the insulator can prevent the current from flowing through the bracket to the ground or other structures that should not be energized, thereby avoiding electric shock or equipment damage, and improving the safety and insulation of the mutual insulator.

[0048] The primary winding of the current transformer 10 is connected in series to the three-phase power line through the first terminal 5, the secondary winding adopts a Y-shaped connection, and the secondary winding is grounded at a common point. The primary winding of the voltage transformer 9 is connected in parallel to the three-phase power line, the secondary winding adopts a Y-shaped connection, and the secondary winding is grounded at a common point. The Y-type connection method is not only simple in structure and easy to use, but also can ensure three-phase balance while providing a stable power supply, and has the effect of absorbing harmonics.

[0049] The use of a circuit breaker can prevent the power supply from being disconnected in time when a fault occurs in the voltage transformer 9 causing excessive current. The voltage transformer 9 provides accurate current information for the voltage stabilizer, which helps the voltage stabilizer to adjust the voltage more accurately, jointly maintain circuit stability, improve the reliability and safety of the power system, facilitate voltage balancing, improve voltage stability, and facilitate the use of a voltmeter to detect the voltage.

[0050] Furthermore, through the Y-type connection of the secondary winding of the voltage transformer 9, and the use of a circuit breaker and a voltage stabilizer, it is convenient to balance the voltage of the transformer. The Y-type connection can ensure three-phase balance while providing a stable power supply, and has the effect of absorbing harmonics. Balancing the output voltage of the transformer can reduce the loss of lines and equipment, improve power supply efficiency, avoid equipment damage caused by load overload, ensure the good operation of low-voltage power grid protection, and improve the detection accuracy of the voltage in the power grid.

[0051] By adjusting the spacing of the transformer mounting frame 18, it is convenient to fix the transformer mounting frame 18 and the first transformer housing 1. Appropriate spacing can ensure that the transformer is more stable during installation, avoid loose installation or displacement due to improper spacing, improve the practicality of the transformer mounting frame 18, improve the safety of the transformer, and improve the flexibility and convenience of the device.

[0052] Working principle: When using the transformer, first adjust the spacing between the two transformer mounting frames 18 according to the specifications of the first transformer housing 1, and insert the mounting frame connecting rod 20 into the corresponding mounting frame connecting tube 19, use the first fixing bolt 11 to fix the transformer mounting frame 18 to the first transformer housing 1, and use the second fixing bolt 22 to fix the mounting frame connecting tube 19 to the corresponding mounting frame connecting rod 20, so as to facilitate the installation of the first transformer housing 1. At the same time, the setting of the lifting ring 12 and the handle 23 facilitates the transfer of the first transformer housing 1 using lifting equipment, thereby improving the flexibility and convenience of the device. At the same time, by adjusting the spacing between the two transformer mounting frames 18, the appropriate spacing can ensure that the transformer is more stable during installation, avoid loosening or displacement of the installation due to improper spacing, improve the practicality of the transformer mounting frame 18, and improve the safety of the transformer.

[0053] By using the first insulator 6, the second insulator 7 and the third insulator 8, the insulation effect of the mutual insulator can be improved. The insulator has good insulation performance and can effectively prevent the current from passing through, thereby ensuring the safe and reliable operation of the mutual insulator. At the same time, the insulator can prevent the current from flowing through the bracket to the ground or other structures that should not be energized, thereby avoiding electric shock or equipment damage, and improving the safety and insulation of the mutual insulator.

[0054] The primary winding of the current transformer 10 is connected in series to the three-phase power line through the first terminal 5, the secondary winding adopts a Y-shaped connection, and the secondary winding is grounded at a common point. The primary winding of the voltage transformer 9 is connected in parallel to the three-phase power line, the secondary winding adopts a Y-shaped connection, and the secondary winding is grounded at a common point. The Y-type connection method is not only simple in structure and easy to use, but also can ensure three-phase balance while providing a stable power supply, and has the effect of absorbing harmonics.

[0055] The use of a circuit breaker can prevent the power supply from being disconnected in time when a fault occurs in the voltage transformer 9 causing excessive current. The voltage transformer 9 provides accurate current information for the voltage stabilizer, which helps the voltage stabilizer to adjust the voltage more accurately, jointly maintain circuit stability, improve the reliability and safety of the power system, facilitate voltage balancing, improve voltage stability, and facilitate the use of a voltmeter to detect the voltage.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A balanced voltage device for a 10KV three-element combined transformer, characterized in that: It comprises a first transformer housing (1); A voltage balancing device, the voltage balancing device is arranged on a first transformer housing (1), the voltage balancing device comprises a second transformer housing (2), the second transformer housing (2) is fixedly connected to the upper end of the first transformer housing (1), a voltage transformer (9) is installed inside the first transformer housing (1), and a current transformer (10) is installed inside the second transformer housing (2); A transformer junction box (13) is fixedly connected to the front end of the first transformer housing (1), a plurality of first wiring terminals (14) and a plurality of second wiring terminals (16) are fixedly connected inside the transformer junction box (13), a first grounding terminal (15) and a second grounding terminal (17) are fixedly connected inside the transformer junction box (13), and a voltage stabilizer is installed outside the first transformer housing (1).

2. A balanced voltage device for a 10KV three-element combined transformer according to claim 1, characterized in that: A second insulator (7) is fixedly connected to the surface of the second transformer housing (2), and two transformer porcelain bushings (3) are symmetrically fixedly connected to the surface of the second transformer housing (2), and the two transformer porcelain bushings (3) are both inclined; The surfaces of the two transformer porcelain bushings (3) are fixedly connected with third insulators (8), the interiors of the two transformer porcelain bushings (3) are fixedly connected with first terminal posts (5), and the surfaces of the two transformer porcelain bushings (3) are sleeved with insulating sleeves (4); There are three second transformer housings (2), all of which are arranged on the first transformer housing (1).

3. A balanced voltage device for a 10KV three-element combined transformer according to claim 1, characterized in that: A first insulator (6) is fixedly connected to the surface of the first transformer housing (1).

4. A balanced voltage device for a 10KV three-element combined transformer according to claim 1, characterized in that: The components of the first mutual inductor housing (1) and the second mutual inductor housing (2) are encapsulated by epoxy integral casting.

5. The balanced voltage device of a 10KV three-element combined transformer according to claim 1, characterized in that: A transformer mounting frame (18) is provided at the lower end of the first transformer housing (1), two first fixing bolts (11) are connected to the internal thread of the transformer mounting frame (18), and the transformer mounting frame (18) is fixed to the first transformer housing (1) via the two first fixing bolts (11); The surface of the transformer mounting frame (18) is threadedly connected to two lifting rings (12), and the surface of the transformer mounting frame (18) is fixedly connected to two handles (23); There are two groups of first fixing bolts (11), lifting rings (12), transformer mounting frames (18) and handles (23), which are symmetrically arranged at the bottom of the first transformer housing (1).

6. A balanced voltage device for a 10KV three-element combined transformer according to claim 5, characterized in that: Two mounting frame connecting cylinders (19) and two mounting frame connecting rods (20) are respectively fixedly connected to the surfaces of the two transformer mounting frames (18); a plurality of through holes (21) are respectively provided on the surfaces of the two mounting frame connecting cylinders (19) and the two mounting frame connecting rods (20); and the two mounting frame connecting cylinders (19) are respectively slidably connected to the corresponding mounting frame connecting rods (20); A second fixing bolt (22) is threadedly connected to the corresponding through hole (21), and the two mounting frame connecting tubes (19) and the corresponding mounting frame connecting rods (20) are fixed to each other via the second fixing bolt (22).

7. A method for using the balanced voltage of a 10KV three-element combination transformer, characterized in that: The method comprises the following steps: S1: the primary windings of the current transformer (10) are respectively connected in series to the three-phase power lines, the secondary windings are in a Y shape, the three-phase conductors ABC are connected to the primary windings of the voltage transformer (9), the common points of the primary windings are connected, and the secondary windings are in a Y shape; S2: The common point of the secondary winding of the current transformer (10) is connected to the first grounding terminal (15), the output ends of the secondary winding of the current transformer (10) are respectively connected to the corresponding first wiring terminals (14), the current ratio of the current transformer (10) is 100:5A, and the ammeter is connected in series with the corresponding first wiring terminal (14) and the first grounding terminal (15); S3: The common point of the voltage transformer (9) is connected to the second grounding terminal (17), the other end of the secondary winding of the voltage transformer (9) is connected to the second wiring terminal (16), the voltage ratio of the voltage transformer (9) is 10000:100V, and the three output ends of the secondary winding of the voltage transformer (9) are connected to the corresponding second wiring terminals (16), the three second wiring terminals (16) are connected to the input end of the voltage regulator after the circuit breaker, and the load is connected to the output end of the voltage regulator.

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