Post Insulator Charge Control Ring for UHVDC Particle Discharge
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Solution Overview
Problem
In ultra-high voltage direct current (UHVDC) power transmission devices, particulate matters such as metals and impurities can reduce the insulating strength of the insulating gas and cause distortion of the electric field on the surface of the post insulator, leading to potential insulation failure, as existing technologies lack effective means to completely eliminate these contaminants.
Innovation Solution
A post insulator design incorporating a charge control ring with enhanced surface charge accumulation capabilities, made from materials like ion-doped modified silicon nitride or surface-modified epoxy resin, which forms a strong electric field to attract and discharge particulate matters, preventing them from affecting the insulating post and maintaining insulation integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional post insulator is used in UHVDC transmission devices, then the insulating post can provide basic insulation support, but particulate matters accumulate on the surface causing electric field distortion and insulation strength reduction
Solution Approach 1:
The patent utilizes the harmful particulate matters by designing a charge control ring that generates electric fields to attract and concentrate these particles in specific regions, converting them from harmful contaminants into beneficial charge sources that enhance overall insulation performance and electric field distribution
Solution Approach 2:
The patent changes the electrical parameters of the insulator surface by introducing a charge control ring with controlled charge accumulation capability, modifying the surface charge distribution and electric field characteristics to prevent harmful particle accumulation and maintain insulation strength
2Object-affected harmful factors
If additional particle traps are added to eliminate contaminants, then particulate matters can be removed, but the device complexity increases
Solution Approach 1:
The charge control ring serves multiple functions simultaneously: it controls surface charge distribution, generates electric fields to eliminate particulate matters, and maintains insulation performance, thereby eliminating the need for separate particle trap components and reducing overall device complexity
Solution Approach 2:
The patent merges the particle elimination function with the existing charge control structure of the post insulator, integrating contaminant removal capabilities into the insulator itself rather than adding separate external particle trap devices
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
The charge control ring effectively eliminates particulate matters by generating a strong electric field that discharges and neutralizes them, preventing insulation damage and ensuring reliable operation of the UHVDC power transmission device without the need for additional particle traps.
Implementation Method 1
the charge control ring is configured to accumulate surface charges
Implementation Method 2
the charge control ring forms a strong electric field to attract and discharge particulate matters
Data Source
AI summary
A post insulator includes an insulating post including a first end and a second end that are opposite to each other, a high-voltage-end grading ring connected to the first end of the insulating post, the high-voltage-end grading ring being insulated from the insulating post, a grounding-end grading ring connected to the second end of the insulating post, the grounding-end grading ring being insulated from the insulating post, and a charge control ring disposed on an outer surface of the insulating post, the charge control ring being insulated from the insulating post, and the charge control ring being configured to accumulate surface charges.