Zero-Flux Current Transformer Module for Gas-Insulated Switchgear
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Solution Overview
Problem
Existing power converter modules for gas-insulated switchgear with pipe capsettings are limited in their application scope and face challenges such as high space and cost requirements, exposure to environmental influences, and inability to measure short-circuit currents and fast transient tensions.
Innovation Solution
A current converter module with a pipe-shaped basic element and ring-shaped power converter units designed as zero-flow current converters, using zero-flow flow technology for DC stream measurements, featuring electrically conductive endpieces, an insulating element, and a conductive connection element to record currents separately, while minimizing insulation gaps and using modular components for efficient assembly and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional current transformer modules are used in gas-insulated switchgear, then AC current measurement is enabled, but DC current measurement and extended application range are not achieved
Solution Approach 1:
The patent changes the measurement principle from conventional AC-only transformation to zero-flux measurement technology that enables both AC and DC current measurement. By implementing a zero-flux current transformer unit with compensation winding and detection winding, the system can accurately measure both alternating and direct currents, thereby expanding the application range while maintaining measurement reliability
Solution Approach 2:
The current transformer module is designed with multi-functional capability to handle both AC and DC current measurements using the zero-flux principle. The universal measurement capability allows a single device to serve multiple measurement purposes, eliminating the need for separate AC and DC current transformer modules
2Ease of operation
If modular current transformer modules are installed in existing switchgear, then flexibility and ease of installation are improved, but integration with existing pipe encapsulation systems creates complexity
Solution Approach 1:
The patent merges the current transformer module with the pipe encapsulation system by providing a base element that forms part of the tubular encapsulation. The module is designed as an integrated assembly where the base element, insulating element, and current transformer unit work together as a unified component that can be installed as a single unit within the gas-insulated switchgear, simplifying integration while maintaining modular installation flexibility
Solution Approach 2:
The current transformer module is designed as a segmented, modular unit with distinct functional components (base element, insulating element, current transformer unit) that can be manufactured separately and assembled into a complete module. This segmentation allows for easy installation and replacement of individual modules in existing switchgear systems without requiring complete system disassembly
3Reliability
If complete tubular encapsulation is provided for current paths, then gas insulation and protection are ensured, but space requirements and manufacturing costs increase
Solution Approach 1:
Instead of providing complete tubular encapsulation throughout the entire current path, the patent applies pipe encapsulation only in specific sections where gas insulation is most critical. The base element forms partial tubular encapsulation at key locations, providing localized gas insulation and protection while reducing overall material usage and space requirements compared to full encapsulation
4Adaptability or versatility
If zero-flux current transformer units are implemented, then DC and AC current measurement capabilities are achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The zero-flux current transformer unit is nested within the modular current transformer module structure. The compensation winding and detection winding are integrated into a compact core assembly that is housed within the base element, creating a nested configuration where smaller components are contained within larger structural elements. This nesting approach simplifies manufacturing by organizing complex components in a hierarchical manner
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
Expands the range of use for power converter modules, enhances measurement capabilities, reduces space and cost, and provides effective shielding against transient overvoltages, enabling precise detection and pre-assembly checks of the system.
Implementation Method 1
designed as a zero-flux current transformer unit for current measurement using zero-flux current measurement technology
Data Source
Figure 1
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AI summary
The invention relates to a current transformer module (10) for a switchgear, in particular a gas-insulated switchgear, which has a tubular enclosure for a current path, the module comprising a tubular main element (12) which has two electrically conductive end pieces (16, 18) for forming at least a portion of the tubular enclosure, and at least one annular current transformer unit (28), which is arranged on the tubular main element (12) and circumferentially surrounds the tubular main element (12). According to the invention, the current transformer unit (28) or at least one of the current transformer units (28) is designed as a zero-flow current transformer unit (30) for a current measurement by means of zero-flow current measurement technology. The invention further relates to a corresponding switchgear having a tubular enclosure for a current path and such a current transformer module (10).