Insertable High-Voltage Bushing for 150 kV Transformers
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Solution Overview
Problem
Existing electrical devices with plug-in bushings are limited to lower high-voltage ranges due to complex insulation requirements, making them unsuitable for higher voltage applications.
Innovation Solution
A high-voltage bushing with a fastening section extending over 3 meters, allowing for secure attachment to the housing and providing necessary dielectric strength, combined with a shortened plug-in section and a viscous insulator to ensure effective insulation and prevent voltage peaks, enabling the use of plug-in bushings in higher voltage ranges without complex installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plug-in bushings are used for higher voltages above 150 kV, then the electrical device can operate at higher voltages with improved insulation, but the bushing length and weight increase significantly
Solution Approach 1:
The bushing is divided into two separate components: a socket that remains permanently mounted on the transformer housing, and a plug-in bushing that can be detached and transported separately. This segmentation allows the socket to provide structural support and insulation anchoring, while the plug-in portion provides the necessary voltage insulation without requiring the entire bushing to be permanently installed.
Solution Approach 2:
The socket acts as an intermediary component that remains fixed on the housing and provides the necessary insulation support and mechanical anchoring. The plug-in bushing connects to this socket, allowing the system to achieve high-voltage insulation capabilities without requiring the full bushing assembly to be permanently mounted, thus reducing installation complexity.
2Reliability
If a long column section extending over 3 meters is used to provide necessary dielectric strength, then the bushing can handle higher voltages, but the weight and installation complexity increase
Solution Approach 1:
The bushing system is segmented into a permanently mounted socket with insulation support structures and a separate plug-in bushing with the column section. This allows the complex long-column structure to be manufactured and tested separately, then installed by simply connecting it to the pre-installed socket, reducing overall installation complexity.
Solution Approach 2:
The socket is pre-installed on the housing during manufacturing, with all necessary insulation support structures and mechanical anchoring already in place. This preliminary action allows the plug-in bushing to be simply connected later without requiring complex installation procedures, even though the bushing itself has a long column section for high-voltage capability.
3Stability of the object's composition
If the bushing is designed as a permanent fixed component, then structural stability is improved, but transportation and on-site installation become more difficult
Solution Approach 1:
The bushing system is divided into a permanently fixed socket that provides structural stability when mounted on the housing, and a separate plug-in bushing that can be easily transported and installed. The socket remains as a stable structural component, while the plug-in portion provides the necessary electrical functionality with improved installation ease.
Solution Approach 2:
The socket is designed with universal mounting features and standardized connection interfaces that allow it to serve both as a structural support element permanently fixed to the housing and as a receptacle for the plug-in bushing. This multi-functionality allows the same component to provide both structural stability and facilitate easy installation of the bushing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the use of electrical devices at voltages above 150 kV with improved insulation and reduced installation complexity, allowing for quick on-site operation and avoiding the need for current transformers.
Implementation Method 1
a housing (2) that can be filled with an insulating liquid (19), in which a core (15) with at least one winding (24) is arranged
Implementation Method 2
a viscous insulator to ensure effective insulation and prevent voltage peaks
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
In order to provide an electrical device (1) for connection to a high-voltage supply system having a housing (2) which can be filled with an insulating liquid and in which a core having at least one winding is arranged, and having a bushing plug socket (10) which is fastened to the housing (2) and having a high-voltage bushing (6, 7, 8) which can be inserted into the bushing plug socket (10), which electrical device can also be used at higher voltages, it is proposed that the high-voltage bushing (6, 7, 8) has a fastening section (11) with which it can be fastened to the housing (2) and/or to the bushing plug socket (10) and from which it extends away, by way of a pillar section (12) in a longitudinal direction over a length L2, to a high-voltage connection (13), wherein the length L2 is greater than 3 metres.