High Voltage Bushing Optical Fiber Routing via Oil-Side End
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Solution Overview
Problem
Existing high-voltage bushings face challenges in providing reliable and cost-effective temperature measurement solutions, particularly in maintaining insulation between high-voltage potentials and ground potentials, while avoiding additional feedthroughs for optical waveguides.
Innovation Solution
The optical waveguide is routed through the high-voltage bushing via the oil-side end, eliminating the need for additional feedthroughs by using the transformer oil for insulation and allowing for a simpler connection to evaluation units, with options for routing through the inner conductor or between the conductor and insulating body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical waveguide is led out of the high-voltage bushing through the fastening flange region, then the temperature measurement can be performed, but additional feedthroughs are required which increase device complexity and cost
Solution Approach 1:
The optical waveguide is routed through the oil-side end of the high-voltage bushing, merging the exit path of the optical waveguide with the existing oil-filled terminal region. This eliminates the need for separate feedthrough structures in the fastening flange area, as the transformer oil itself provides the necessary insulation medium. The optical waveguide passes through the insulating body and exits into the oil-filled space where it can be connected to evaluation units without additional insulating feedthroughs.
2Measurement precision
If additional feedthroughs are installed for the optical waveguide, then temperature measurement is enabled, but manufacturing costs and assembly complexity increase
Solution Approach 1:
The transformer oil in the high-voltage bushing serves a dual function: it provides electrical insulation for the high-voltage conductor and simultaneously serves as the insulation medium for the optical waveguide. The oil-filled space at the oil-side end naturally accommodates the optical waveguide without requiring additional insulating structures, allowing the system to use its existing resources (transformer oil) to solve the insulation problem for temperature measurement.
3Loss of information
If the optical waveguide is routed through the fastening flange with voltage divider connections, then temperature data can be acquired, but available space for connection is limited
Solution Approach 1:
The optical waveguide is routed through a different spatial dimension - specifically through the oil-side end of the high-voltage bushing rather than through the fastening flange region. This dimensional change in routing path provides abundant connection space at the oil-side end, where the optical waveguide can be easily connected to evaluation units without interfering with the voltage divider connections located on the fastening flange.
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
This configuration enhances reliability and reduces costs by simplifying the structure and allowing for spatially resolved temperature measurements without additional assembly measures, while maintaining effective insulation and facilitating easy connection of the optical waveguide.
Implementation Method 1
For example, the temperature can be determined in a spatially resolved manner using a temperature-dependent light scattering by means of a light signal fed into the optical waveguide.
Implementation Method 2
a transformer oil, which fills a space between the oil-side end and a tank wall of the transformer, provides good insulation between the high-voltage potential of the inner conductor and the ground potential of the tank wall
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a high-voltage bushing (1, 18) with an inner conductor (2) extending through an insulating body (7) and between an open-air end (3) and an oil-filled end (4) of the high-voltage bushing, and with an optical fiber (14) for measuring the temperature of the high-voltage bushing. The invention is characterized in that the optical fiber exits the high-voltage bushing at the oil-filled end (4). The invention further relates to a transformer device (17) with the high-voltage bushing.