Siemens Energy Global Gmbh & Co. Kg

Hainan Jinpan Smart Technology Co. Ltd

Siemens Aktiengesellschaft

Siemens Ltda.

Li, Hui

Wang, Zhongbo

Chen, Wei

Moreno, Andre Luiz

Navarro, Martin Alsina

Wang, Yaoqiang

Zhang, Yuqian

Lu, Xiaofeng

Yu, Xiong

Zhang, Min

Martin Alsina Navarro

Andre Luiz Moreno

Richard Sille

Ming Zhang

Haoning Liang

Yaoqiang Wang

Wei Chen

Xiong Yu

Yong Guo

Fritz Sorg

Renan Junqueira Dias

Jean Carlos Da Silva

Marilucia Martinato

Eledilson Clayton Betiol

Xiaofeng Lu

Yuqian Zhang

Hui Li

Zhongbo Wang

Xiong Li

Rongwang Wang

Jose Carlos Medeiros

In some embodiments, a shielded coil assembly is provided that includes (1) a coil having an outer surface, an inner surface, an upper end surface and a lower end surface and a first insulating material formed over the outer surface, inner surface, upper end surface and lower end surface of the coil; and (2) a conductive shield comprising a conductive paint applied along the first insulating material so that the conductive paint extends over at least a portion of each of the outer surface, inner surface, upper end surface, and lower end surface of the coil. In one or more embodiments, a dry-type transformer may be formed using the shielded coil assembly. Numerous other embodiments are provided.

Shielded coil assemblies and methods for dry-type transformers

A transformer for mounting on a mast of an air-insulated energy distribution network has a core which is protected against corrosion and environmental influences, while at the same time stable retention is provided. The transformer contains a winding block having a solid insulating body, in which at least one upper voltage winding and at least one lower voltage winding are arranged. The winding block delimits a completely peripherally closed central retention opening. Furthermore, a core unit is provided which has at least one magnetizable core and is inductively coupled to each lower voltage winding by each upper voltage winding. The core unit extends through the retention opening via at least one core leg and annularly extends around the winding block on the outside by a ring portion. Retention devices are provided for fastening the ring portion to the mast.

Transformer for fastening to a mast of an energy distribution network

A winding unit for connecting to a high-voltage grid or network includes a winding embedded in a solid insulating body and a first main connection terminal connected to a first winding end of the winding and disposed on a first support formed on the insulating body. A second main connection terminal is connected to a second winding end of the winding. The winding has partial windings and taps for adjusting the number of windings of the partial windings connected in series. Outgoing lines extending in the insulating body connect the taps to a tap connection terminal accessible from the outside. The tap connection terminals are formed on the support in order to encapsulate the higher voltage in a resin block over the entire periphery by using a shielding cage.

Winding unit having taps configured on the support

A sealed core-coil assembly in a submersible transformer includes a coil assembly having an inner coil with inner, outer, upper, and lower surfaces, and an outer coil with inner, outer, upper, and lower surfaces, a core assembly including a core window and core column of a magnetically-permeable material, the core column and core window having inner side surfaces, and an expandable sealing member including an inner cavity that is fillable or evacuatable so that a compliant insulation material is positioned in the inner cavity to block passage of water and prevent the formation of a loop of water, which otherwise would act like an electrical short in a submerged transformer.

Core sealing assemblies, core-coil assemblies, and sealing methods

A transformer core for a dry-type transformer includes a laminated construction having several groups of stacked laminations that form a step-lap sequence of laminations. Each group in the step-lap sequence has a mean length different than an adjacent group in the step-lap sequence and has at least two identical laminations per group, wherein at least one group has at least four identical laminations. Methods of assembling a transformer core are also provided, as are other aspects.

Transformer cores and assembly methods thereof for high efficiency and high anti-corrosion performance

A tap changer assembly of a dry-type transformer. The tap changer assembly includes a first molding including multiple taps, a semi-conductive coating applied to the first molding, a conductive shield provided overtop some of the semi-conductive coating, a grounding member comprising a ring of bosses interconnected by a grounding conductor connected to the conductive shield, a second molding applied over at least a portion of the conductive shield and the grounding conductor, the second molding forming a molded sealing surface, a conductive cover coupled to the ring of bosses; and a sealing member sealing a space between the molded sealing surface and the conductive cover. Dry-type transformers and methods of forming a tap changer assembly of a dry-type transformer are provided, as are numerous other aspects.

Molded tap changer assemblies and methods for dry-type transformers

In some embodiments, a connection bar is provided for connecting multiple high voltage coils of a dry-type transformer along a top or bottom of the dry-type transformer. The connection bar includes (1) an electrically insulating body having a plurality of openings, each opening sized to receive at least one of high voltage terminals of the transformer; (2) an electrical connection pathway within the electrically insulating body configured to create a predetermined electrical connection between multiple high voltage coils of the transformer; (3) external connector terminals embedded within and extending from the electrically insulating body, the external connector terminals connected to the electrical connection pathway; and (4) a ground shield embedded within the electrically insulating body and configured to shield high voltage terminals of each high voltage coil of the transformer. Numerous other aspects are provided.

Methods, apparatus and systems for dry-type transformers

Transformer

The present invention relates to a dry distribution transformer comprising a housing ('), a coil (), a sealed compartment () and a taps panel () associated to the coil (). The taps panel () has an electrostatic shield () and is positioned inside the sealed compartment (), the sealed compartment () being filled with a solid dielectric material and protected by a cover (). One also describes an electric insulation method for a taps panel of a dry distribution transformer and taps panel for a dry distribution transformer filled with removable insulating resin. The coil () has a grounded () electrostatic shield ().

Transformer provided with a taps panel, an electric-insulation method for a taps panel of a dry distribution transformer, and a taps panel for a dry distribution transformer

It is described a single-phase or three-phase distribution electric transformer, of solid insulation, for use in aerial installation, in poles, in platforms or pedestals, or installation in underground distribution network for operation in air environment, semi-submerged or submerged. Such transformer comprises at least one high voltage winding () and at least one low voltage winding () concentrically assembled around a core column (), the low voltage and high voltage windings () being electrically isolated from a solid material, a core window () being defined as a space between two core columns (), the transformer comprising at least one electrical insulation sheet () assembled on at least a core window () of said transformer, the assembly of the electrical insulation sheet () being defined in the longitudinal direction () of the transformer. Such sheet () avoids the formation of spiral around the core by immersion water or conductive dust. The use of this dry transformer in the underground distribution networks in the cities offers more safety to the population, because the dry transformer does not explode, apart from eliminating the risk of environmental contamination through the leakage of oil from transformers in oil. Once the dry transformer of the invention does not explode, the underground installation chambers can be simpler and more economic once they do not need to be resistant to explosion.

Submersible dry distribution transformer

The present invention refers to a system for regulating a load voltage (C) in power distribution circuits comprising at least: a regulation transformer () the secondary winding of the regulatory transformer () being operatively arranged in series between a power source (F) and the load (C), the power source (F) being capable of providing a supply voltage (VAL) to the load (C); a measuring device () operatively associated to the load (C), the measuring device () being capable of measuring at least one value of an electric signal of the load (SCA); a control device () operatively associated to the measuring device (), the control device () being capable of comparing the value of the electric signal of the load (SCA) with a pre-established reference value and providing a correcting electric signal (SCO); and an actuation device () operatively associated to the control device (), wherein the actuation device () is capable of providing an adjustment voltage (VAJ) proportional to the correcting electric signal (SCO), the adjustment voltage (VAJ) being applicable to fixed electric taps of the primary winding of the regulation transformer (), the fixed electric taps being configured to remain immovable when there is a variation of the adjustment voltage (VAJ), the regulation transformer () being capable of transforming the adjustment voltage (VAJ) into a regulation voltage (VRE), the regulation voltage (VRE) being added in module and phase to the supply voltage (VAL). The present invention also refers to a method executed by the above-mentioned system.

System for regulating a load voltage in power distribution circuits and method for regulating a load voltage in power distribution circuits

A method for producing a transformer core with layers of core laminations includes forming at least one core lamination of at least two segmental laminations. An end region of a first segmental lamination has a straight crosscut edge. The straight crosscut edge of the first segmental lamination together with a corresponding straight crosscut edge of an end region of a second segmental lamination forms a form-locking straight abutting edge. The straight abutting edge is at an angle relative to the longitudinal direction of the end region of one of the segmental laminations of the first core lamination. Using core laminations having different angular orientations of the abutting edges, avoids magnetic losses such as those occurring when using conventional layering techniques. Simultaneously, an intermediate space created by conventional layering techniques between individual core lamination packs can be minimized, and thereby susceptibility to corrosion can likewise be reduced or completely avoided.

Method for producing a transformer core and a transformer core

Growing community of inventors

Sao Paulo, Brazil

Martin Alsina Navarro