Capacitive Voltage Transformer Structure for Stable Capacitance
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Solution Overview
Problem
Existing capacitive voltage transformers experience unstable capacitance due to vibration and temperature variations during transportation and operation, leading to inconsistent performance and insulation issues.
Innovation Solution
The capacitive voltage transformer incorporates squirrel cage electrodes to compress and fix the capacitor core, volume matching devices to compensate for dielectric oil volume changes, and a shielding function to improve insulation, along with a closed chamber filled with dielectric oil and a breathing regulator system to maintain optimal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor core is left uncompressed, then the structure is simpler, but the capacitance becomes unstable due to vibration and temperature variation
Solution Approach 1:
The patent introduces squirrel cage electrodes as an intermediary component between the capacitor core and the external environment. These electrodes serve as a mediator that transmits compressive force to the capacitor core while maintaining electrical isolation and providing structural support, thereby stabilizing capacitance without requiring direct mechanical connection to the core
Solution Approach 2:
The patent extracts the compression function from the overall structure and assigns it to a dedicated component (squirrel cage electrodes). This separation allows the capacitor core to focus on its primary function of storing electrical energy while the squirrel cage electrodes handle the mechanical compression task, improving both stability and maintainability
2Reliability
If the dielectric oil volume is not compensated, then the structure is simpler, but the insulation performance deteriorates due to volume changes from temperature variation
Solution Approach 1:
The patent employs volume matching devices that utilize thermal expansion and compression of a compensating fluid to dynamically adjust for dielectric oil volume changes. As temperature varies, the compensating fluid expands or contracts, automatically maintaining the dielectric oil volume at optimal levels and preserving insulation performance without mechanical intervention
Solution Approach 2:
The system establishes a feedback mechanism where temperature-induced volume changes in the dielectric oil are continuously compensated by the volume matching devices. The expansion and contraction of the compensating fluid respond to temperature variations, creating a self-regulating system that maintains optimal insulation conditions
3Reliability
If the capacitor core is not fixed, then the structure is simpler, but the capacitance changes due to vibration during transportation
Solution Approach 1:
The squirrel cage electrodes function as counteracting structures that resist vibrational forces during transportation. By providing continuous compressive force and structural support, they counterbalance the disruptive effects of vibration and temperature variation, keeping the capacitor core in a stable, fixed position without requiring additional mechanical restraints
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 design stabilizes capacitance, enhances insulation performance, prevents electric field concentration, and ensures reliable operation under varying environmental conditions, while reducing the height and increasing mechanical strength of the transformer.
Implementation Method 1
the volume matching devices are used to compensate for a volume change of the dielectric oil inside
Implementation Method 2
the squirrel cage electrodes have a shielding function, which can shield the electric field concentration caused by edges of the volume matching devices
Data Source
AI summary
The present invention provides a capacitive voltage transformer, including: a capacitive voltage-dividing component and an electromagnetic unit. The capacitive voltage-dividing component comprises: one or more levels of stacks, and each stack is a coupling capacitor. The coupling capacitor includes: an upper cover plate, a lower cover plate, an insulating sleeve, a capacitor core, squirrel cage electrodes, volume matching devices, a high voltage lead, and a low voltage lead. The lowermost coupling capacitor is provided with a medium voltage lead and a lead terminal. The low voltage lead of the lowermost coupling capacitor is led out through a low-voltage leading-out tube arranged in the lead terminal, and the medium voltage lead of the lowermost coupling capacitor is led out through a medium-voltage leading-out post arranged in the lead terminal. The medium-voltage leading-out post passes through and out of the low-voltage leading-out tube and is arranged coaxially with the low-voltage leading-out tube.