A medium-voltage transformer for new energy

Abstract

This application relates to the technical field of instrument transformers, and specifically relates to a medium-voltage instrument transformer for new energy, which at least includes an instrument transformer housing, a fixed contact, a sliding contact plate, a short-circuiting component, and an actuating component; the instrument transformer housing at least includes an upper ring part, a lower wiring part, etc.; the fixed contact is arranged below the rectangular main cavity; the sliding contact plate is connected to the fixed contact under normal conditions; in the initial stage, the short-circuiting component moves leftward to contact the sliding contact plate to achieve short-circuiting, and in the second stage, the short-circuiting component moves rightward along with the sliding contact plate, causing the fixed contact to disconnect from the sliding contact plate. The medium-voltage instrument transformer for new energy described in this case is a current transformer, and its sliding contact of the sliding contact plate is connected to the instrument transformer coil. Under normal conditions, the sliding contact is connected to the fixed contact and the ammeter to achieve the purpose of measuring current. The medium-voltage instrument transformer for new energy described in this case provides a short-circuiting component to achieve temporary short-circuiting.

Description

Technical Field

[0001] This application relates to the technical field of instrument transformers, and particularly to a medium-voltage instrument transformer for new energy. Background Art

[0002] A current transformer is a device used to convert a large current into a small current, and is widely used in power systems, industrial control, measuring instruments, new energy and other fields. Its main functions are to isolate the high-voltage circuit to ensure the safety of operators and to achieve the measurement purpose. In actual work, it is often necessary to replace and repair the secondary-side ammeter. However, the current transformer needs to comply with the principle of strictly prohibiting open circuits on the secondary side, that is, when the secondary side of the current transformer is open, the primary-side current still flows through, which will cause the secondary-side voltage to rise sharply, seriously endangering the safety of equipment and personnel. The current transformers of the prior art do not have a dedicated temporary short-circuit function and need to be fixed with a wiring clip, and the operation is cumbersome. Therefore, it is necessary to design an instrument transformer that can realize temporary short-circuit independently. Summary of the Invention

[0003] A medium-voltage instrument transformer for new energy at least includes:

[0004] An instrument transformer housing, including an upper ring part located above, a lower wiring part located below the upper ring part, and a chamber assembly arranged inside the lower wiring part. The chamber assembly at least includes a rectangular main chamber. The instrument transformer housing further includes a horizontal partition arranged in the rectangular main chamber in the left-right direction, a partition through hole arranged in the horizontal partition, and a guiding middle plate arranged in the partition through hole; the chamber assembly further includes a limiting insertion ear formed at the upper end of the rectangular main chamber, and the chamber assembly further includes mounting blind holes arranged below the rectangular main chamber. There are two mounting blind holes in total, and a contact through hole is formed upward on the right side of each mounting blind hole. A contact base rod is further arranged at the left side of the bottom of the rectangular main chamber at the position of the contact through hole. An adjusting base is arranged at the left side of the upper end of the rectangular main chamber, and a horizontal through hole is arranged horizontally in the adjusting base, and a limiting inner ring is further arranged on the inner wall of the horizontal through hole;

[0005] Fixed contacts, there are two of them. The fixed contacts are arranged below the rectangular main chamber, and the fixed contacts correspond to the contact through holes one by one. The fixed contact includes a contact body inserted into the contact through hole and abutted against the right side of the contact base rod, and a horizontal lug arranged on the left side of the contact body and arranged in the mounting blind hole. The horizontal lug is fixedly connected to the mounting blind hole by a bolt;

[0006] The sliding contact plate is arranged in the rectangular main cavity. Under normal conditions, the sliding contact plate is connected to the fixed contact. The sliding contact plate includes a contact plate body slidably arranged in the through hole of the partition plate, a guiding transverse groove formed in the contact plate body for accommodating the guiding middle plate, and a sliding compression spring arranged in the guiding transverse groove on the left side of the guiding middle plate. A sliding contact is respectively arranged on the left and right sides of the contact plate body, and the sliding contact is connected to the mutual inductor coil located inside the upper part of the ring through a flexible wire;

[0007] The short - circuit assembly is slidably arranged in the rectangular main cavity. In the initial stage, the short - circuit assembly moves leftward to contact the sliding contact plate to achieve short - circuit. In the second stage, the short - circuit assembly moves rightward along with the sliding contact plate, causing the sliding contact plate to disconnect from the fixed contact. The short - circuit assembly includes a short - circuit sliding plate slidably arranged at the lower part of the horizontal partition plate in the rectangular main cavity, a receiving transverse hole formed in the short - circuit sliding plate for accommodating the contact base rod and the contact body located on the right side, a metal folding piece arranged on the short - circuit sliding plate, a compression jack arranged on the right side of the short - circuit sliding plate, a vertical through hole arranged longitudinally on the compression jack, and a short - circuit compression spring arranged in the compression jack.

[0008] The action assembly is used to sequentially achieve the leftward movement of the short - circuit assembly in the initial stage and the rightward movement of the sliding contact plate and the short - circuit assembly in the second stage. The action assembly includes a later - moving assembly and an earlier - moving assembly;

[0009] The later - moving assembly includes a rotating round rod rotatably arranged in the horizontal through hole, a limiting ring groove formed on the outer wall of the rotating round rod and cooperating with the limiting inner ring, a transmission key inserted on the right end side wall of the rotating round rod, a rotating insertion cylinder slidably sleeved on the rotating round rod, a transmission key hole formed on the outer wall of the rotating insertion cylinder and inserted and cooperating with the transmission key, a driving screw rod formed on the right side of the rotating insertion cylinder and passing through the limiting insertion ear, and a damping compression spring wound on the driving screw rod. The damping compression spring is arranged between the rotating insertion cylinder and the limiting insertion ear. An insertion cylinder ring groove is arranged on the outer edge of the rotating insertion cylinder, and a driving sliding ring is rotatably sleeved in the insertion cylinder ring groove. A driving insertion rod is arranged at the lower end of the driving sliding ring and inserted into the through hole of the partition plate. The driving insertion rod stops on the left side of the sliding contact plate;

[0010] The earlier - moving assembly includes an internally - threaded tube screwed on the driving screw rod, a connecting longitudinal arm arranged at the lower end of the internally - threaded tube, and a hole - inner cross bar arranged at the left side of the lower end of the connecting longitudinal arm and inserted into the hole on the right side of the compression jack. Anti - detachment insertion blocks are respectively arranged above and below the hole - inner cross bar and inserted into the vertical through hole.

[0011] Beneficial effects:

[0012] A medium - voltage mutual inductor for new energy in this case is a current mutual inductor. Its mutual inductor coil is connected through the sliding contact of the sliding contact plate. Under normal conditions, the sliding contact is connected to the fixed contact and the ammeter to achieve the purpose of measuring current.

[0013] In the new energy medium-voltage transformer described in this case, a short-circuit component is provided to achieve temporary short-circuit:

[0014] In the initial stage, the first moving component drives the short-circuit component to move leftward, so that the left short-circuit piece and the right short-circuit piece are connected to the corresponding sliding contacts, realizing the short-circuit of the transformer coil;

[0015] In the second stage, the later moving component drives the sliding contact plate and the short-circuit component to move rightward. The sliding contact plate is disconnected from the fixed contact, which is convenient for directly repairing and replacing the ammeter connected to the fixed contact; at the same time, the sliding contact plate and the short-circuit component always maintain a short-circuit connection to ensure that the transformer will not open circuit. Description of the Drawings

[0016] Figure 1 is a schematic diagram of an embodiment of the medium-voltage transformer.

[0017] Figure 2 is a schematic diagram of another embodiment of the medium-voltage transformer.

[0018] Figure 3 is a front view of an embodiment of the medium-voltage transformer.

[0019] Figure 4 is a sectional view of an embodiment of the medium-voltage transformer.

[0020] Figure 5 is a sectional view of an embodiment of the transformer housing.

[0021] Figure 6 is a partial sectional view of the first state of the medium-voltage transformer.

[0022] Figure 7 is a partial sectional view of the second state of the medium-voltage transformer.

[0023] Figure 8 is a partial sectional view of the third state of the medium-voltage transformer.

[0024] Figure 9 is a schematic diagram of an embodiment of the short-circuit component.

[0025] In the figure:

[0026] 1. Transformer housing, 11. Upper part of the ring, 12. Lower part of the wiring, 13. Chamber assembly, 131. Rectangular main chamber, 132. Limiting lug, 133. Installation blind hole, 134. Contact through hole, 135. Contact base rod, 136. Adjustment base, 137. Horizontal through hole, 138. Limiting inner ring, 14. Horizontal partition, 15. Partition through hole, 16. Guiding middle plate, 17. Connecting lug;

[0027] 2. Fixed contact, 21. Contact body, 22. Horizontally arranged lug, 23. Wiring jack;

[0028] 3. Sliding contact plate, 31. Contact plate body, 32. Guiding horizontal groove, 33. Sliding compression spring, 34. Sliding contact;

[0029] 4. Short - circuit component, 41. Short - circuit sliding plate, 42. Accommodating horizontal hole, 43. Metal folding piece, 431. Connecting horizontal piece, 432. Left short - circuit piece, 433. Right short - circuit piece, 44. Compression jack, 45. Vertically arranged through - hole, 46. Short - circuit compression spring;

[0030] 5. Actuating component;

[0031] 51. Rear - acting component, 511. Rotating round rod, 512. Limiting ring groove, 513. Driving key, 514. Rotating sleeve, 515. Driving key hole, 516. Driving screw rod, 517. Damping compression spring, 518. Driving sliding ring, 519. Driving plug rod;

[0032] 52. Pre - acting component, 521. Inner - threaded tube, 522. Connecting longitudinal arm, 523. Cross - bar in hole, 524. Anti - detachment plug block. Detailed implementation mode

[0033] A medium - voltage mutual inductor for new energy, at least including:

[0034] Mutual inductor housing 1, including an upper ring part 11 located above, a lower wiring part 12 located below the upper ring part 11, and a chamber assembly 13 provided in the lower wiring part 12. The chamber assembly 13 at least includes a rectangular main chamber 131. The mutual inductor housing 1 further includes a horizontally arranged partition 14 provided in the rectangular main chamber 131 in the left - right direction, a partition through - hole 15 provided in the horizontally arranged partition 14, and a guiding middle plate 16 provided in the partition through - hole 15. The chamber assembly 13 further includes a limiting insertion ear 132 formed at the upper end of the rectangular main chamber 131. The chamber assembly 13 further includes an installation blind hole 133 provided below the rectangular main chamber 131. There are two installation blind holes 133 in total. A contact through - hole 134 is formed upward on the right side of each installation blind hole 133. A contact base rod 135 is provided at the left side of the bottom of the rectangular main chamber 131 corresponding to the contact through - hole 134. An adjustment base 136 is provided at the left side of the upper end of the rectangular main chamber 131. A horizontally arranged through - hole 137 is provided in the adjustment base 136 in the horizontal direction. A limiting inner ring 138 is further provided on the inner wall of the horizontally arranged through - hole 137;

[0035] There are two fixed contacts 2, which are arranged below the rectangular main cavity 131. The fixed contacts 2 correspond to the contact through holes 134 one by one. The fixed contact 2 includes a contact body 21 inserted into the contact through hole 134 and abutted against the right side of the contact base rod 135, and a horizontal lug 22 arranged on the left side of the contact body 21 and disposed in the mounting blind hole 133. The horizontal lug 22 is fixedly connected to the mounting blind hole 133 by bolts;

[0036] The sliding contact plate 3 is disposed in the rectangular main cavity 131. The sliding contact plate 3 is connected to the fixed contact 2 under normal conditions. The sliding contact plate 3 includes a contact plate body 31 slidably arranged in the partition through hole 15, a guiding transverse groove 32 formed in the contact plate body 31 for accommodating the guiding middle plate 16, and a sliding compression spring 33 arranged in the guiding transverse groove 32 on the left side of the guiding middle plate 16. A sliding contact 34 is provided on each of the left and right sides of the contact plate body 31. The sliding contact 34 is connected to the mutual inductor coil located in the upper part 11 of the ring through a flexible wire;

[0037] The short - circuit assembly 4 is slidably arranged in the rectangular main cavity 131. In the initial stage, the short - circuit assembly 4 moves leftward to contact the sliding contact plate 3 to achieve short - circuit. In the second stage, the short - circuit assembly 4 moves rightward along with the sliding contact plate 3, causing the sliding contact plate 3 to disconnect from the fixed contact 2. The short - circuit assembly 4 includes a short - circuit sliding plate 41 slidably arranged in the rectangular main cavity 131 below the horizontal partition 14, a receiving transverse hole 42 formed in the short - circuit sliding plate 41 for accommodating the contact base rod 135 and the contact body 21 on the right side, a metal flap 43 arranged on the short - circuit sliding plate 41, a compression jack 44 arranged on the right side of the short - circuit sliding plate 41, a longitudinal through hole 45 arranged longitudinally on the compression jack 44, and a short - circuit compression spring 46 arranged in the compression jack 44.

[0038] The action assembly 5 is used to sequentially achieve the leftward movement of the short - circuit assembly 4 in the initial stage and the rightward movement of the sliding contact plate 3 and the short - circuit assembly 4 in the second stage. The action assembly 5 includes a later - moving assembly 51 and an earlier - moving assembly 52;

[0039] The post-moving component 51 includes a rotatable rotating round rod 511 disposed in the horizontally arranged through hole 137, a limiting ring groove 512 formed on the outer wall of the rotating round rod 511 and cooperating with the limiting inner ring 138, a driving plug key 513 disposed at the right end of the side wall of the rotating round rod 511, a rotating insertion cylinder 514 slidably sleeved on the rotating round rod 511, a driving key hole 515 formed on the outer wall of the rotating insertion cylinder 514 and inserted and cooperating with the driving plug key 513, a driving screw rod 516 formed on the right side of the rotating insertion cylinder 514 and passing through the limiting insertion ear 132, and a damping compression spring 517 wound around the driving screw rod 516. The damping compression spring 517 is disposed between the rotating insertion cylinder 514 and the limiting insertion ear 132. An insertion cylinder ring groove is provided on the outer edge of the rotating insertion cylinder 514, and a driving sliding ring 518 is rotatably sleeved in the insertion cylinder ring groove. A driving insertion rod 519 is provided at the lower end of the driving sliding ring 518 and inserted into the partition through hole 15. The driving insertion rod 519 abuts against the left side of the sliding contact plate 3;

[0040] The pre-moving component 52 includes an internally threaded tube 521 screwed on the driving screw rod 516, a connecting vertical arm 522 disposed at the lower end of the internally threaded tube 521, and a hole internal cross bar 523 disposed at the left side of the lower end of the connecting vertical arm 522 and inserted into the right side of the compression insertion hole 44. Anti-disengagement insertion blocks 524 are respectively provided above and below the hole internal cross bar 523 and inserted into the vertically arranged through hole 45.

[0041] Furthermore:

[0042] The metal flap 43 includes a connecting cross piece 431 disposed at the front end of the short-circuit sliding plate 41, a left short-circuit piece 432 disposed behind the left end of the connecting cross piece 431 and fixed to the left end face of the short-circuit sliding plate 41, and a right short-circuit piece 433 disposed on the right side of the connecting cross piece 431 and inserted backward into the accommodating cross hole 42.

[0043] Furthermore:

[0044] One connecting insertion ear 17 is respectively provided on the left and right sides of the lower part of the wire connection 12.

[0045] Furthermore:

[0046] A wire connection jack 23 is provided at the lower end of the contact main body 21.

[0047] It should be noted that a non-return groove with a narrow upper part and a wide lower part is provided on the contact base rod 135, and a non-return convex head cooperating with the non-return groove is provided on the left side of the contact main body 21.

[0048] The fixed contact 2 described in this case is connected to the electric meter.

[0049] Under normal conditions, the sliding contact 34 is connected to the fixed contact 2 to connect the fixed contact 2 and the electric meter:

[0050] The sliding compression spring 33 acts on the contact plate body 31 to move it to the left, driving the sliding contact 34 to be connected to the corresponding contact body 21 respectively.

[0051] This case can also temporarily short-circuit the sliding contact 34 to facilitate the maintenance and replacement of the electric meter:

[0052] As shown in the attached Figure 6 , 7 shown:

[0053] Twist the rotating round rod 511 and the transmission key 513 to drive the transmission key hole 515, the rotating insert cylinder 514, and the driving screw 516 to rotate. The driving screw 516 acts on the internally threaded tube 521 to make the rear moving assembly 51 and the front moving assembly 52 approach each other;

[0054] In the initial stage, due to the elastic force of the damping compression spring 517, the rear moving assembly 51 can only rotate and cannot move. The driving screw 516 acts on the internally threaded tube 521 to drive the entire front moving assembly 52 to move to the left, and drives the short-circuiting assembly 4 to move to the left until the left short-circuit piece 432 and the right short-circuit piece 433 of the metal flap 43 are respectively connected to the corresponding sliding contact 34, realizing the short-circuit of the sliding contact 34;

[0055] As shown in the attached Figure 8 shown:

[0056] Continue to rotate the rotating round rod 511 and the transmission key 513 to drive the transmission key hole 515, the rotating insert cylinder 514, and the driving screw 516 to rotate. The driving screw 516 acts on the internally threaded tube 521 to make the rear moving assembly 51 and the front moving assembly 52 approach each other;

[0057] At this time, it enters the second stage. Since the internally threaded tube 521 is blocked by the limit ear 132, the front moving assembly 52 cannot continue to move to the left. Therefore, the driving screw 516 drives the rotating insert cylinder 514 to move to the left against the damping of the damping compression spring 517 while rotating;

[0058] The driving slip ring 518 and the driving rod 519 drive the sliding contact plate 3 to move to the left, and the sliding contact 34 is disconnected from the fixed contact 2, facilitating the subsequent maintenance and replacement of the electric meter;

[0059] Meanwhile, the short-circuiting assembly 4 moves to the right with the sliding contact plate 3, and the short-circuit compression spring 46 is compressed and retracted. During this process, the metal flap 43 and the sliding contact 34 always remain short-circuited.

Claims

1. A new energy medium voltage transformer, characterized in that: At least: A transformer housing (1) comprises an upper annular portion (11) located above, a wiring lower portion (12) located below the upper annular portion (11), and a chamber assembly (13) disposed in the wiring lower portion (12), wherein the chamber assembly (13) comprises at least a rectangular main chamber (131), and the transformer housing (1) further comprises a transverse partition (14) disposed in the rectangular main chamber (131) along a left-right direction, a partition through hole (15) disposed in the transverse partition (14), and a guide middle plate (16) disposed in the partition through hole (15); Two fixed contacts (2) are provided, and the fixed contacts (2) are arranged below the rectangular main cavity (131); A sliding touch plate (3) is arranged in the rectangular main cavity (131), and the sliding touch plate (3) is normally connected to the fixed contact (2); A short-circuit component (4) is slidably disposed in the rectangular main cavity (131); the short-circuit component (4) moves leftward in an initial stage to contact the sliding touch plate (3) to achieve short-circuiting; and the short-circuit component (4) moves rightward along with the sliding touch plate (3) in a second stage to disconnect the sliding touch plate (3) from the fixed contact (2); An action component (5) is used to sequentially realize the leftward action of the short-circuit component (4) in the initial stage and the rightward action of the sliding touch plate (3) and the short-circuit component (4) in the second stage; The chamber assembly (13) further comprises a limiting plug ear (132) formed at the upper end of the rectangular main chamber (131), the chamber assembly (13) further comprises a mounting blind hole (133) arranged below the rectangular main chamber (131), two mounting blind holes (133) are provided, each mounting blind hole (133) further comprises a contact through hole (134) formed upward on the right side, a contact base rod (135) is further provided at the bottom of the rectangular main chamber (131) and located on the left side of the contact through hole (134), an adjustment base (136) is provided on the left side of the upper end of the rectangular main chamber (131), a transverse through hole (137) is provided in the transverse direction along the inner side of the adjustment base (136), and a limiting inner ring (138) is further provided on the inner wall of the transverse through hole (137); The fixed contact (2) corresponds to the contact through hole (134) one by one, and the fixed contact (2) comprises a contact body (21) inserted into the contact through hole (134) and abutting against the right side of the contact base rod (135), and a transverse lug (22) arranged on the left side of the contact body (21) and arranged in the mounting blind hole (133), wherein the transverse lug (22) is fixedly connected to the mounting blind hole (133) by means of a bolt; The sliding touch panel (3) comprises a touch panel body (31) slidably arranged in the partition through hole (15), a guide transverse groove (32) formed in the touch panel body (31) for accommodating the guide middle plate (16), and a sliding compression spring (33) arranged in the guide transverse groove (32) and located on the left side of the guide middle plate (16), and a sliding contact (34) is respectively arranged on the left and right sides of the touch panel body (31), and the sliding contact (34) is connected to the mutual inductor coil located in the upper part of the ring (11) through a soft wire; The short-circuit assembly (4) comprises a short-circuit slide plate (41) slidably disposed in the rectangular main cavity (131) below the horizontal partition plate (14), a accommodating horizontal hole (42) disposed in the short-circuit slide plate (41) for accommodating a contact base rod (135) and a contact body (21) disposed on the right side, a metal folding sheet (43) disposed on the short-circuit slide plate (41), a compression socket (44) disposed on the right side of the short-circuit slide plate (41), a longitudinal through hole (45) disposed in the longitudinal direction on the compression socket (44), and a short-circuit compression spring (46) disposed in the compression socket (44); The action component (5) comprises a rear-moving component (51) and a front-moving component (52); The rear moving assembly (51) comprises a rotating rod (511) rotatably disposed in the transverse through hole (137), a limiting ring groove (512) formed on the outer wall of the rotating rod (511) and cooperating with the limiting inner ring (138), a transmission key (513) disposed at the right end of the side wall of the rotating rod (511), a rotating insert cylinder (514) slidably sleeved on the rotating rod (511), a transmission key hole (515) formed on the outer wall of the rotating insert cylinder (514) and plugged with the transmission key (513), and a transmission key hole (515) formed on the right side of the rotating insert cylinder (514) and passing through the rotating insert cylinder (514). A driving screw (516) is arranged through the limit plug ear (132), and a damping compression spring (517) is wound around the driving screw (516), wherein the damping compression spring (517) is arranged between the rotating plug cylinder (514) and the limit plug ear (132), the rotating plug cylinder (514) is provided with a plug cylinder annular groove on its outer edge and a driving slip ring (518) is rotatably sleeved in the plug cylinder annular groove, and a driving plug rod (519) is provided at the lower end of the driving slip ring (518) and is inserted into the partition plate through hole (15), and the driving plug rod (519) is stopped at the left side of the sliding touch plate (3); The first moving component (52) comprises an internally threaded tube (521) threadedly connected to the driving screw (516), a connecting longitudinal arm (522) provided at the lower end of the internally threaded tube (521), and an in-hole cross bar (523) provided at the left side of the lower end of the connecting longitudinal arm (522) and inserted into the right side of the compression plug hole (44), wherein the in-hole cross bar (523) is provided with anti-dropping plug blocks (524) inserted into the longitudinal through hole (45) at the upper and lower parts, respectively.

2. A new energy medium voltage transformer according to claim 1, characterized in that: The metal folding piece (43) comprises a connecting transverse piece (431) arranged at the front end of the short-circuiting slide plate (41), a left short-circuiting piece (432) arranged behind the left end of the connecting transverse piece (431) and fixed to the left end surface of the short-circuiting slide plate (41), and a right short-circuiting piece (433) arranged on the right side of the connecting transverse piece (431) and inserted backwards into the accommodating transverse hole (42).

3. A new energy medium voltage transformer according to claim 2, characterized in that: A connecting ear (17) is respectively provided on the left and the right of the lower wiring portion (12).

4. A new energy medium voltage transformer according to claim 3, characterized in that: A wiring socket (23) is provided at the lower end of the contact body (21).

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