WO2023004962A1 - 一种带有二次绕组的接地变压器 - Google Patents

一种带有二次绕组的接地变压器 Download PDF

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Publication number
WO2023004962A1
WO2023004962A1 PCT/CN2021/119243 CN2021119243W WO2023004962A1 WO 2023004962 A1 WO2023004962 A1 WO 2023004962A1 CN 2021119243 W CN2021119243 W CN 2021119243W WO 2023004962 A1 WO2023004962 A1 WO 2023004962A1
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winding
secondary winding
transformer
iron core
tap
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PCT/CN2021/119243
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English (en)
French (fr)
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关银环
周亮
岑炯
万东星
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吴江变压器有限公司
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Publication of WO2023004962A1 publication Critical patent/WO2023004962A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Definitions

  • the utility model relates to the technical field of transformers, in particular to a grounding transformer with a secondary winding.
  • the low-voltage side of the main transformer is generally connected in delta, and the neutral point is not grounded.
  • the grounding transformer can provide an artificial neutral point for the power system with neutral point insulation, and improve the reliability of power grid operation.
  • the windings in commonly used grounding transformers are generally composed of series windings with zigzag connection (ZN connection). After the neutral point is drawn out, it is directly grounded or grounded through a grounding resistor or an arc suppression coil.
  • this grounding transformer has a large zero-sequence impedance (30-50 ⁇ ), and when a single-phase grounding occurs in the power system, this Grounded transformers are less capable of withstanding short-circuit currents.
  • the utility model provides a grounding transformer with a secondary winding to solve the above technical problems.
  • the utility model provides a grounding transformer with a secondary winding, including: a transformer body, the transformer body includes: an iron core, a main winding and a secondary winding, and the main winding is arranged on the Outside the iron core, the secondary winding is arranged outside the main winding, and the main winding and the secondary winding are insulated from each other; the main winding includes an inner winding and an outer winding, and the inner winding and the outer winding are arranged along the The radial distribution of the transformer body is described, the inner winding and the outer winding are insulated from each other, and three opposite polarities are connected in series to realize ZN connection; the secondary winding is connected by yn.
  • the main winding has a 5-speed tap.
  • the head and tap of the inner winding go out from the top and are connected to the first tap
  • the head and the tap of the outer winding go out from the bottom and are connected to the second tap
  • the inner winding and the outer The winding direction is reversed.
  • the grounding transformer further includes a combined tap changer, the upper and lower parts of the combined tap changer are respectively connected to the first tap line and the second tap line.
  • the iron core adopts a three-phase three-column iron core.
  • the main winding adopts a multi-layer cylindrical structure.
  • the secondary winding adopts a single-layer cylindrical structure.
  • the grounding transformer with secondary winding provided by the utility model has the following advantages:
  • the main winding in the utility model is arranged close to the iron core, which can reduce the zero-sequence impedance, meet the design requirement of 10 ⁇ , and ensure that the grounding transformer has a stronger ability to withstand short-circuit current when the system is single-phase grounded;
  • the secondary winding is arranged outside the main winding, and the insulation distance between the main winding and the secondary winding can be adjusted freely under the premise of satisfying the electric strength, so as to ensure that the short-circuit impedance between the main winding and the secondary winding meets the design requirements, thereby limiting the short circuit current and improve the short-circuit resistance of the transformer.
  • the main winding includes inner and outer windings, the inner and outer windings are connected in series, and the upper and lower outlets are connected in opposite directions.
  • the Z-type connection is realized through a combined tap switch, and the voltage adjustment function is satisfied at the same time; the lead wire structure is simple and easy to operate.
  • Transformer The body is simple and beautiful.
  • Fig. 1 and Fig. 2 are the structural representations of the grounding transformer with secondary winding in a specific embodiment of the present utility model
  • Fig. 3 is a wiring diagram of the main winding in a specific embodiment of the present invention.
  • the utility model provides a grounding transformer with a secondary winding.
  • the grounding transformer in the utility model is an oil-immersed grounding transformer, as shown in Figures 1 to 3, including: a transformer body 10, and the transformer body 10 includes: Iron core 11, main winding and secondary winding 14.
  • the iron core 11 adopts a three-phase three-column iron core, the main winding is arranged outside the iron core 11, and the secondary winding 14 Set outside the main winding, the main winding and the secondary winding 14 are insulated from each other; the main winding includes an inner winding 12 and an outer winding 13, and the inner winding 12 and the outer winding 13 are along the transformer body Radial distribution, the inner winding 12 and the outer winding 13 are insulated from each other, and three opposite polarities are connected in series to realize ZN connection; the secondary winding 14 is connected by yn, which can be used as an auxiliary power supply.
  • the main winding in the utility model is arranged close to the iron core 11, which can reduce the zero-sequence impedance and meet the design requirement of 10 ⁇ , and can ensure that when the system is single-phase grounded, the ability of the grounding transformer to withstand short-circuit current is stronger; the secondary winding 14 Arranged outside the main winding, the insulation distance between the main winding and the secondary winding 14 can be freely adjusted under the premise of satisfying the electric strength, and the design value of the impedance voltage is controlled between 4% and 6%, thereby limiting the short-circuit current and improving the transformer short-circuit resistance.
  • the main winding has a 5-speed tap for adjusting the output voltage of the secondary side.
  • the head and tap of the inner winding 12 go out and are connected to the first tap 21, and the head and tap of the outer winding 13 go out and are connected to the second tap 22.
  • the winding directions of the winding 12 and the outer winding 13 are opposite.
  • the inner winding 12 is left-handed and the outer winding 13 is right-handed.
  • the grounding transformer further includes a combined tap changer 20, the upper and lower parts of the combined tap changer 20 are respectively connected to the first tap line 21 and the second tap line 22, and the cross-connected
  • the method realizes the Z-shaped connection of the main windings in series, and satisfies the voltage adjustment function at the same time.
  • the main winding adopts a multi-layer cylindrical structure, and the head end and taps are axially outgoing from the upper and lower sides; the secondary winding 14 adopts a single-layer cylindrical structure. Cylindrical structure is adopted, the winding is simple, and the impulse voltage distribution is good.
  • the grounded transformer with secondary winding provided by the utility model includes a transformer body 10, and the transformer body 10 includes: an iron core 11, a main winding and a secondary winding 14, and the main winding is arranged on the The outside of the iron core 11, the secondary winding 14 is arranged outside the main winding, the main winding and the secondary winding 14 are insulated from each other; the main winding includes an inner winding 12 and an outer winding 13, the inner The winding 12 and the outer winding 13 are distributed along the radial direction of the transformer body 10, the inner winding 12 and the outer winding 13 are insulated from each other, and the three opposite polarities are connected in series to realize ZN connection; the secondary winding 14 is connected by yn.
  • the main winding in the utility model is arranged close to the iron core 11, which can reduce the zero-sequence impedance and meet the design requirement of 10 ⁇ , and can ensure that when the system is single-phase grounded, the ability of the grounding transformer to withstand short-circuit current is stronger; the secondary winding 14 Arranged outside the main winding, the insulation distance between the main winding and the secondary winding 14 can be freely adjusted under the premise of satisfying the electric strength, so as to ensure that the short-circuit impedance between the primary and secondary windings meets the design requirements, thereby limiting the short-circuit current and improving the short-circuit resistance of the transformer ability.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

一种带有二次绕组（14）的接地变压器，包括变压器本体（10）,所述变压器本体（10）包括：铁芯（11）、主绕组和二次绕组（14）,所述主绕组设置于所述铁芯（11）外侧，所述二次绕组（14）设置于所述主绕组外侧，所述主绕组与所述二次绕组（14）相互绝缘；所述主绕组包括内绕组（12）和外绕组（13）,所述内绕组（12）和外绕组（13）沿所述变压器本体（10）辐向分布，所述内绕组（12）和外绕组（13）相互绝缘，三相反极性串联实现ZN连接；所述二次绕组（14）采用yn连接。主绕组靠近铁芯（11）布置，可降低零序阻抗，满足10Q的设计要求，能够确保系统发生单相接地时，接地变压器耐受短路电流的能力更强；将二次绕组（14）布置在主绕组外侧，可在满足电气强度的前提下自由调整主绕组和二次绕组（14）间的绝缘距离，提升变压器抗短路能力。

Description

一种带有二次绕组的接地变压器 技术领域
本实用新型涉及变压器技术领域，尤其涉及一种带有二次绕组的接地变压器。
背景技术
在目前的电力系统中，主变压器低压侧一般为三角形接法，采用中性点不接地的运行方式。当中性点不接地的电力系统发生单相故障时，容易产生铁磁谐振过电压及间歇性弧光接地过电压，继而导致变压器绝缘损坏、线路跳闸，危及电网运行安全。接地变压器能够为中性点绝缘的电力系统提供人为中性点，提高电网运行可靠性。常用的接地变压器中的绕组一般由采用曲折连接(ZN连接)的串联绕组组成，中性点引出后直接接地或经接地电阻、消弧线圈接地。若需要增加辅助电源，则可以通过在铁芯与串联绕组之间增加二次绕组，但是这种接地变压器零序阻抗较大(30～50Ω)，且当电力系统发生单相接地时，这种接地变压器耐受短路电流的能力较差。
因此，如何提供一种零序阻抗较小且抗短路能力更强的带有二次绕组的接地变压器是本领域技术人员亟待解决的一个技术问题。
实用新型内容
本实用新型提供一种带有二次绕组的接地变压器，以解决上述技术问题。
为解决上述技术问题，本实用新型提供一种带有二次绕组的接地变压器，包括：变压器本体，所述变压器本体包括：铁芯、主绕组和二次绕组，所述主绕组设置于所述铁芯外侧，所述二次绕组设置于所述主绕组外侧，所述主绕组与所述二次绕组相互绝缘；所述主绕组包括内绕组和外绕组，所述内绕组和外绕组沿所述变压器本体辐向分布，所述内绕组和外绕组相互绝缘，三相反极性串联实现ZN连接；所述二次绕组采用yn连接。
较佳地，所述主绕组带有5档分接头。
较佳地，所述内绕组的首头和分接头上出线且与第一分接线连接，所述外绕组的首头和分接头下出线且与第二分接线连接，所述内绕组和外绕组的绕向相反。
较佳地，所述接地变压器还包括组合型分接开关，所述组合型分接开关的上下两部分分别与所述第一分接线和第二分接线连接。
较佳地，所述铁芯采用三相三柱式铁芯。
较佳地，所述主绕组采用多层圆筒式结构。
较佳地，所述二次绕组采用单层圆筒式结构。
与现有技术相比，本实用新型提供的带有二次绕组的接地变压器具有如下优点：
1、本实用新型中的主绕组靠近铁芯布置，可降低零序阻抗，满足10Ω的设计要求，能够确保系统发生单相接地时，接地变压器耐受短路电流的能力更强；
2、将二次绕组布置在主绕组外侧，可在满足电气强度的前提下自由调整主绕组和二次绕组间的绝缘距离，确保主绕组和二次绕组间短路阻抗满足设计要求，从而限制短路电流、提升变压器抗短路能力。
3、主绕组包括内、外绕组，内、外绕组串联，上、下出线且绕向相反，通过组合分接型开关实现Z型连接，同时满足电压调整功能；引线结构简单、操作方便、变压器器身简洁、美观。
附图说明
图1和图2为本实用新型一具体实施方式中带有二次绕组的接地变压器的结构示意图；
图3为本实用新型一具体实施方式中主绕组的接线图。
图中：10-变压器本体、11-铁芯、12-内绕组、13-外绕组、14-二次绕组、20-组合型分接开关、21-第一分接线、22-第二分接线。
具体实施方式
为了更详尽的表述上述实用新型的技术方案，以下列举出具体的实施例来 证明技术效果；需要强调的是，这些实施例用于说明本实用新型而不限于限制本实用新型的范围。
本实用新型提供的带有二次绕组的接地变压器，本实用新型中的接地变压器为油浸式接地变压器，如图1至图3所示，包括：变压器本体10，所述变压器本体10包括：铁芯11、主绕组和二次绕组14，本实施例中，所述铁芯11采用三相三柱式铁芯，所述主绕组设置于所述铁芯11外侧，所述二次绕组14设置于所述主绕组外侧，所述主绕组与所述二次绕组14相互绝缘；所述主绕组包括内绕组12和外绕组13，所述内绕组12和外绕组13沿所述变压器本体10辐向分布，所述内绕组12和外绕组13相互绝缘，三相反极性串联实现ZN连接；所述二次绕组14采用yn连接，可作为辅助电源。本实用新型中的主绕组靠近铁芯11布置，可降低零序阻抗，满足10Ω的设计要求，能够确保系统发生单相接地时，接地变压器耐受短路电流的能力更强；将二次绕组14布置在主绕组外侧，可在满足电气强度的前提下自由调整主绕组和二次绕组14间的绝缘距离，将阻抗电压设计值控制在4％～6％之间，从而限制短路电流、提升变压器抗短路能力。
较佳地，请重点参考图1和图2，所述主绕组带有5档分接头，用于调节二次侧输出电压。具体地，所述内绕组12的首头和分接头上出线且与第一分接线21连接，所述外绕组13的首头和分接头下出线且与第二分接线22连接，所述内绕组12和外绕组13的绕向相反，本实施例中，所述内绕组12左绕向，外绕组13右绕向。较佳地，所述接地变压器还包括组合型分接开关20，所述组合型分接开关20的上下两部分分别与所述第一分接线21和第二分接线22连接，通过跨接的方式实现串联的主绕组的Z形连接，同时满足电压调整功能。
较佳地，所述主绕组采用多层圆筒式结构，首末头及分接头为上、下轴向出线；所述二次绕组14采用单层圆筒式结构。采用圆筒式结构，绕制简单，冲击电压分布好。
综上所述，本实用新型提供的带有二次绕组的接地变压器，包括变压器本体10，所述变压器本体10包括：铁芯11、主绕组和二次绕组14，所述主绕组设置于所述铁芯11外侧，所述二次绕组14设置于所述主绕组外侧，所述主绕组与所述二次绕组14相互绝缘；所述主绕组包括内绕组12和外绕组13，所述 内绕组12和外绕组13沿所述变压器本体10辐向分布，所述内绕组12和外绕组13相互绝缘，三相反极性串联实现ZN连接；所述二次绕组14采用yn连接。本实用新型中的主绕组靠近铁芯11布置，可降低零序阻抗，满足10Ω的设计要求，能够确保系统发生单相接地时，接地变压器耐受短路电流的能力更强；将二次绕组14布置在主绕组外侧，可在满足电气强度的前提下自由调整主绕组和二次绕组14间的绝缘距离，确保一、二次绕组间短路阻抗满足设计要求，从而限制短路电流、提升变压器抗短路能力。
显然，本领域的技术人员可以对实用新型进行各种改动和变型而不脱离本实用新型的精神和范围。这样，倘若本实用新型的这些修改和变型属于本实用新型权利要求及其等同技术的范围之内，则本实用新型也意图包括这些改动和变型在内。

Claims (7)

  1. 一种带有二次绕组的接地变压器，其特征在于，包括变压器本体，所述变压器本体包括：铁芯、主绕组和二次绕组，所述主绕组设置于所述铁芯外侧，所述二次绕组设置于所述主绕组外侧，所述主绕组与所述二次绕组相互绝缘；所述主绕组包括内绕组和外绕组，所述内绕组和外绕组沿所述变压器本体辐向分布，所述内绕组和外绕组相互绝缘，三相反极性串联实现ZN连接；所述二次绕组采用yn连接。
  2. 如权利要求1所述的带有二次绕组的接地变压器，其特征在于，所述主绕组带有5档分接头。
  3. 如权利要求2所述的带有二次绕组的接地变压器，其特征在于，所述内绕组的首头和分接头上出线且与第一分接线连接，所述外绕组的首头和分接头下出线且与第二分接线连接，所述内绕组和外绕组的绕向相反。
  4. 如权利要求3所述的带有二次绕组的接地变压器，其特征在于，所述接地变压器还包括组合型分接开关，所述组合型分接开关的上下两部分分别与所述第一分接线和第二分接线连接。
  5. 如权利要求1所述的带有二次绕组的接地变压器，其特征在于，所述铁芯采用三相三柱式铁芯。
  6. 如权利要求1所述的带有二次绕组的接地变压器，其特征在于，所述主绕组采用多层圆筒式结构。
  7. 如权利要求1所述的带有二次绕组的接地变压器，其特征在于，所述二次绕组采用单层圆筒式结构。
PCT/CN2021/119243 2021-07-27 2021-09-18 一种带有二次绕组的接地变压器 WO2023004962A1 (zh)

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