Isolation transformer body structure
By using copper busbars, brackets, and wooden parts to fix the leads in the isolation transformer, and by using foil winding and wire winding to wind the coils, combined with support curtains and grounding shields, the problems of complex lead structure and easy short circuits are solved, and reliable connection and insulation isolation are achieved.
Patent Information
- Application Number
- CN202520122032.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-20
AI Technical Summary
The lead structure of existing isolation transformers is complex and prone to short circuit hazards.
The leads of the high-voltage and low-voltage coil groups are fixed by a combination of copper busbars, brackets and wooden parts. The coils are wound by foil winding and wire winding. The insulation and heat dissipation are enhanced by the combination of support curtains and grounding screens to achieve reliable electrical connection.
The simplified lead wire structure reduces or even eliminates potential lead wire hazards, improves current carrying capacity and insulation effect, and enhances electrical isolation between high and low voltage.
Smart Images
Figure CN223757368U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field especially a isolation transformer body structure. BACKGROUND
[0002] The isolation transformer is used for the isolation of electric equipment and power grid equipment, meets the safety and stability requirement of power system, ensures that there is no electric contact between power supply and electric equipment. The isolation transformer is used for lightning protection, filtering and protection when the power equipment is maintained and repaired. The isolation transformer is a 1:1 transformer, and the primary voltage is equal to the secondary voltage. And the secondary of the isolation transformer is not connected with the ground, and there is no potential difference between any two lines and the ground. People will not be electrocuted when contacting any line, so it is safer. Secondly, the output end of the isolation transformer is completely disconnected from the input end, thereby playing a good filtering and protection effect on the input end, and providing stable power supply for various electric equipment.
[0003] The lead structure of the isolation transformer in the prior art is complex, and there is a hidden danger of short circuit. CONTENT OF THE UTILITY MODEL
[0004] To solve the above problems, the application provides an isolation transformer body structure with a reasonable structure, thereby effectively simplifying the lead structure, reducing or even avoiding the occurrence of lead hidden dangers while ensuring the reliability of electrical connection.
[0005] The technical scheme adopted by the utility model is as follows:
[0006] An isolation transformer body structure comprises an iron core assembly, a coil assembly is wound on the iron core assembly to form a transformer assembly, the transformer assembly is placed and supported in an oil tank from top to bottom, and a cover is arranged at the opening of the upper part of the oil tank; low-voltage bushings are sequentially arranged on the front side of the cover, and high-voltage bushings are sequentially arranged on the rear side of the cover; the coil assembly comprises a low-voltage coil group located in the inner layer and a high-voltage coil group located in the outer layer, the leads of the high-voltage coil group and the low-voltage coil group are connected by copper bars, the lead of the low-voltage coil group is fixed on the upper clamp on the low-voltage side through a support one, and the lead of the high-voltage coil group is fixed on the upper clamp on the high-voltage side through a support two; the copper bars are clamped by wooden pieces, and the two ends of the wooden pieces are fixed on the upper clamp through fixing pieces.
[0007] As a further improvement of the above technical scheme:
[0008] The low-voltage coil group is wound in a foil winding form, and the high-voltage coil group is wound in a wire winding form.
[0009] The lead of the high-voltage coil group is connected with the low-voltage sleeve through copper bars, and the tail end of the lead is connected with the 0-phase sleeve.
[0010] The lead of the low-voltage coil group is connected with the low-voltage sleeve, and the tail end of the lead is connected with the 0-phase sleeve.
[0011] The voltage of the high-voltage winding formed by the high-voltage coil group and the low-voltage winding formed by the low-voltage coil group is 400V, and the high-voltage side and the low-voltage side adopt a Dyn11 connection mode.
[0012] The low-voltage coil group is internally provided with a plurality of radial spacer curtains one, and externally surrounded by two layers of spacer curtains two, and a grounding screen is arranged between the two layers of the spacer curtains two.
[0013] The number of turns of the high-voltage coil group is √3 times that of the low-voltage coil group.
[0014] The thickness of the spacer curtain one is smaller than that of the spacer curtain three.
[0015] The spacer curtain one, the spacer curtain two and the spacer curtain three have the same structure and comprise a paperboard, and the paperboard is provided with spacer strips arranged in order and in parallel.
[0016] The grounding screen is connected with the lower clamp of the iron core assembly, and the structure of the grounding screen comprises an insulating plate one and an insulating plate two arranged in parallel, a plurality of paper grooves with lateral openings arranged in parallel and closely between the insulating plate one and the insulating plate two, and a copper foil tape fixedly arranged in each paper groove.
[0017] Compared with the prior art, the high-voltage coil group and the low-voltage coil group have the following beneficial effects:
[0018] The combination of the copper bars, the support and the wooden piece realizes the lead extraction of the high-voltage coil group and the low-voltage coil group, effectively simplifies the lead structure, and reduces or even avoids the occurrence of lead hazards while ensuring the reliability of electrical connection.
[0019] The high-voltage coil group and the low-voltage coil group have the following advantages:
[0020] By adopting the foil winding form for the low-voltage coil group and the wire winding form for the high-voltage coil group, the resistance of the lead is small, so that a larger current can be passed and less heat is generated.
[0021] By connecting the grounding screen with the lower clamp, insulation is achieved, and the electrical isolation between high and low voltage is effectively strengthened; only magnetic connection exists in the circuit, no direct electrical connection exists, and isolation is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a schematic view of the front view direction of the utility model.
[0023] Figure 2 It is a schematic view of the top view direction of the utility model.
[0024] Figure 3 It is a schematic view of the rear view direction of the utility model.
[0025] Figure 4 It is a schematic view of the left view direction of the utility model.
[0026] Figure 5 It is a schematic view of the coil assembly of the utility model.
[0027] Figure 6 It is a structural schematic view of the support bar curtain three of the utility model.
[0028] Figure 7 It is a top view of Figure 6 .
[0029] Figure 8 It is a structural schematic view of the grounding screen of the utility model.
[0030] Wherein: 1, iron core assembly; 2, oil tank; 3, cover; 4, low voltage sleeve; 5, coil assembly; 6, high voltage sleeve; 7, heat dissipation structure; 41, support one; 61, support two;
[0031] 51, low voltage coil group; 52, support bar curtain one; 53, grounding screen; 54, support bar curtain two; 55, support bar curtain three; 56, high voltage coil group; 551, paperboard; 552, support bar; 531, insulating plate one; 532, insulating plate two; 533, copper belt; 534, outgoing terminal; 535, copper foil belt; 536, paper tank. DETAILED DESCRIPTION
[0032] The specific implementation manners of the utility model will be described below in combination with the drawings.
[0033] For example, Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the body structure of the isolation transformer of the embodiment comprises a core assembly 1, a coil assembly 5 is wound on the core assembly 1 to form a transformer assembly, the transformer assembly is placed and supported in an oil tank 2 from top to bottom, a cover 3 is arranged at the opening of the upper part of the oil tank 2; a low-voltage bushing 4 is sequentially arranged on the front side of the cover 3, and a high-voltage bushing 6 is sequentially arranged on the rear side of the cover 3; as Figure 5 As shown, the coil assembly 5 comprises a low-voltage coil group 51 located in the inner layer and a high-voltage coil group 56 located in the outer layer, the lead wires of the high-voltage coil group 56 and the low-voltage coil group 51 are connected by copper bars, the lead wire of the low-voltage coil group 51 is fixed on the upper clamp on the low-voltage side through a support one 41, and the lead wire of the high-voltage coil group 56 is fixed on the upper clamp on the high-voltage side through a support two 61; the copper bars are clamped by wood pieces, and the two ends of the wood pieces are fixed on the upper clamp through fixing pieces.
[0034] In the embodiment, the copper bars, the supports and the wood pieces are combined, the copper bars on the lead wires are reliably fixed by the wood pieces, and the lead wires are fixed by the supports, so that the lead wires of the high-voltage coil group 56 and the low-voltage coil group 51 are drawn out, the structure of the lead wires is effectively simplified while the reliability of the electrical connection is ensured.
[0035] The low-voltage coil group 51 is wound in a foil winding form, and the high-voltage coil group 56 is wound in a wire winding form.
[0036] In the embodiment, the low-voltage coil group 51 is wound in a foil winding form, and the high-voltage coil group 56 is wound in a wire winding form, and the resistance of the lead wire is small, so that a larger current can be passed and less heat is generated.
[0037] The lead wires of the high-voltage coil group 56 are connected in a head-to-tail manner through the copper bars, the tail end of the A phase is connected to the head end of the B phase, the tail end of the B phase is connected to the head end of the C phase, and the tail end of the C phase is connected to the head end of the A phase, and each head end is directly drawn upward and connected to each phase bushing in the high-voltage bushing 6.
[0038] The head end of the lead wire of the low-voltage coil group 51 is connected to each phase bushing in the low-voltage bushing 4, and the tail end of the lead wire is connected to the 0 phase bushing through the copper bar.
[0039] The voltage of the high-voltage winding formed by the high-voltage coil group 56 and the voltage of the low-voltage winding formed by the low-voltage coil group 51 are equal, both being 400V, and the high-voltage side and the low-voltage side adopt a Dyn11 connection mode.
[0040] The low-voltage coil group 51 is radially spaced by a plurality of support curtains one 52, and is surrounded by two layers of support curtains two 54, and a grounding shield 53 is arranged between the two layers of support curtains two 54, and the high-voltage coil group 56 is arranged outside the support curtains two 54, and a support curtain three 55 is arranged inside the high-voltage coil group 56; the number of the support curtains one 52 is greater than the number of the support curtain three 55, and the number of turns of the high-voltage coil group 56 is greater than the number of turns of the low-voltage coil group 51.
[0041] In the embodiment, the insulation distance is increased and the heat dissipation is enhanced by using the support curtains.
[0042] The number of turns of the high-voltage coil group 56 is √3 times the number of turns of the low-voltage coil group 51 to meet the transformation ratio.
[0043] The thickness of the support curtains one 52 is less than the thickness of the support curtain three 55.
[0044] In the embodiment, the support curtains one 52 on the inner side have a small thickness, which facilitates the actual surrounding operation, and the large number of the support curtains one 52 ensures the oil flow and heat dissipation to guarantee the heat dissipation effect of the middle part.
[0045] The support curtains one 52, the support curtains two 54 and the support curtain three 55 have the same structure, as shown in Figure 6 and Figure 7 The support curtains one 52, the support curtains two 54 and the support curtain three 55 have the same structure, as shown in
[0046] The grounding shield 53 is connected with the lower clamp of the core assembly 1.
[0047] In the embodiment, the grounding shield 53 is connected with the lower clamp, which plays an insulation role and effectively enhances the electrical isolation between the high and low voltages; only the magnetic connection exists in the circuit, and there is no direct electrical connection, which plays an isolation role.
[0048] As shown in Figure 8 The structure of the grounding shield 53 comprises the spaced insulating plates one 531 and two 532, a plurality of paper grooves 536 with lateral openings are arranged in parallel and closely between the insulating plates one 531 and two 532, and a copper foil tape 535 is fixedly arranged in each paper groove 536; the copper tape 533 is arranged perpendicularly to the paper grooves 536, the copper tape 533 is tightly welded with each copper foil tape 535 to form a connection, and a terminal 534 is connected at the end of the copper tape 533.
[0049] In the embodiment, the copper foil strip 535 in the grounding shield 53 is located between the paper groove 536 and the insulating plate one 531 and the insulating plate two 532, so that the copper foil strip 535 is completely isolated; meanwhile, the paper groove 536 can position the copper foil strip 535, can be parallelly laid without deviation, and helps to reduce the cost.
[0050] In the embodiment, the heat dissipation structure 7 can be arranged around the oil tank 2.
[0051] The utility model discloses simplify lead structure, reduce even avoid the occurrence of lead hidden danger while guaranteeing the reliability of electric property connection.
[0052] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments.
[0053] The above description is an explanation of the utility model, not a limitation of the utility model, and the scope defined by the utility model is shown in the claims, and any form of modification within the protection scope of the utility model can be made.
Claims
1. An isolating transformer core structure comprising a core assembly (1), characterized in that: The iron core assembly (1) is provided with a coil assembly (5) and constitutes a transformer assembly, the transformer assembly is placed and supported in an oil tank (2) from top to bottom, an upper opening of the oil tank (2) is provided with a cover (3), the cover (3) is sequentially provided with a low-voltage bushing (4) at the front side and a high-voltage bushing (6) at the rear side, the coil assembly (5) comprises a low-voltage coil group (51) at the inner layer and a high-voltage coil group (56) at the outer layer, lead wires of the high-voltage coil group (56) and the low-voltage coil group (51) are connected by copper bars, the lead wire of the low-voltage coil group (51) is fixed on the upper clamp at the low-voltage side through a support one (41), and the lead wire of the high-voltage coil group (56) is fixed on the upper clamp at the high-voltage side through a support two (61), the copper bars are clamped by wood pieces, and the two ends of the wood pieces are fixed on the upper clamp by fixing pieces.
2. The structure of the transformer core according to claim 1, wherein: The low-voltage coil group (51) is wound in a foil winding mode, and the high-voltage coil group (56) is wound in a wire winding mode.
3. The structure of the transformer core according to claim 1, wherein: The lead wire of the high-voltage coil group (56) is connected in series at the head and tail of A / B / C three-phase through the copper bars, the tail end of the A-phase is connected with the head end of the B-phase, the tail end of the B-phase is connected with the head end of the C-phase, and the tail end of the C-phase is connected with the head end of the A-phase, and each head end is directly led upward and connected with each phase bushing in the high-voltage bushing (6).
4. The structure of the transformer core according to claim 1, wherein: The head end of the lead wire of the low-voltage coil group (51) is connected with each phase bushing in the low-voltage bushing (4), and the tail end of the lead wire is connected to the 0-phase bushing through the copper bar.
5. The structure of the transformer core according to claim 1, wherein: The voltage of the high-voltage winding formed by the high-voltage coil group (56) and the low-voltage winding formed by the low-voltage coil group (51) is equal, and each is 400V, and the high-voltage side and the low-voltage side adopt a Dyn11 connection mode.
6. An isolating transformer core structure as claimed in claim 1, characterized in that: The low-voltage coil group (51) is provided with a support strip curtain one (52) arranged in the radial direction, the low-voltage coil group (51) is surrounded by two layers of support strip curtains two (54), a grounding screen (53) is arranged between the two layers of support strip curtains two (54), the high-voltage coil group (56) is surrounded by the support strip curtain two (54), and the high-voltage coil group (56) is internally provided with a support strip curtain three (55); the number of the support strip curtain one (52) is greater than the number of the support strip curtain three (55), and the number of turns of the high-voltage coil group (56) is greater than the number of turns of the low-voltage coil group (51).
7. An isolating transformer core structure as claimed in claim 1 or 6, characterized in that: The number of turns of the high-voltage coil group (56) is √3 times the number of turns of the low-voltage coil group (51).
8. An isolating transformer core structure as claimed in claim 6, characterized in that: The thickness of the support strip curtain one (52) is less than the thickness of the support strip curtain three (55).
9. An isolating transformer core structure as claimed in claim 6, characterized in that: The support strip curtain one (52), the support strip curtain two (54) and the support strip curtain three (55) have the same structure and each comprises a paperboard (551) and support strips (552) arranged in parallel on the paperboard (551); during surrounding, the support strips (552) are vertically arranged, and the support strips (552) are located on the inner side of the paperboard (551).
10. The structure of the transformer core according to claim 6, wherein: The ground screen (53) is connected with the lower clamp of the core assembly (1); the structure of the ground screen (53) comprises the spaced insulating plate one (531) and the insulating plate two (532), a plurality of lateral opening paper grooves (536) are arranged in parallel and closely between the insulating plate one (531) and the insulating plate two (532), and a copper foil tape (535) is fixedly arranged in each paper groove (536); the structure further comprises a copper tape (533) which is arranged perpendicularly to the paper groove (536), the copper tape (533) is tightly welded with each copper foil tape (535) to form a connection, and a terminal (534) is connected to the end of the copper tape (533).