Insulated Conductor Splice Compaction for High Voltage
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Solution Overview
Problem
Conventional mineral insulated (MI) cable splice designs are not suitable for high voltages above 1000 volts, 1500 volts, or 2000 volts and fail at elevated temperatures, requiring compaction of mineral insulant similar to the MI cable, while existing splicing methods do not provide sufficient compaction for high-voltage, high-temperature subsurface applications.
Innovation Solution
A method for coupling insulated conductors involves exposing core portions, filling with electrically insulating powder, compacting using plungers, and forming into a cylindrical shape with a sleeve to achieve high compaction similar to the MI cable, enhancing mechanical and electrical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MI cable splice designs are used, then the splicing process is simple, but the splices fail at high voltages above 1000 volts and elevated temperatures
Solution Approach 1:
The patent applies preliminary action by pre-forming the insulating powder into a compacted cylindrical shape before insertion into the splice. This pre-compaction ensures the powder achieves the necessary density for high-voltage reliability without requiring complex post-installation compaction equipment, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent replaces complex mechanical compaction systems with a simpler approach: pre-compacting the insulating powder into a dense cylindrical form that can be directly inserted into the splice. This substitution maintains the mechanical integrity needed for high-voltage operation while eliminating the need for complex on-site compaction machinery.
2Manufacturing precision
If existing splicing methods are used, then the splicing process is easier to perform, but sufficient compaction for high-voltage, high-temperature applications is not achieved
Solution Approach 1:
The insulating powder is pre-compacted into a dense cylindrical shape before installation, ensuring the necessary compaction density is achieved during manufacturing rather than during field installation. This preliminary compaction action guarantees high manufacturing precision while keeping the field splicing process simple and easy to perform.
Solution Approach 2:
The pre-compacted cylindrical powder acts as an intermediary form that bridges the gap between loose powder and the final compacted state in the splice. This intermediary form allows the powder to be easily handled and installed while ensuring the necessary density is achieved, thus maintaining both manufacturing precision and ease of manufacture.
3Reliability
If loose electrically insulating powder is used in splices, then the splicing process is simpler, but electric field intensities are not reduced and electrical breakdown occurs
Solution Approach 1:
The insulating powder is pre-compacted into a dense cylindrical form before installation, ensuring that the necessary compaction density is achieved to reduce electric field intensities and prevent electrical breakdown. This preliminary action eliminates the need for complex on-site compaction processes while ensuring reliable electrical performance.
Solution Approach 2:
The patent changes the physical state of the insulating powder from loose to densely compacted cylindrical form. This parameter change in density and structure directly reduces electric field intensities within the splice, preventing electrical breakdown while avoiding the need for complex compaction equipment through the pre-formed design.
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 solution enables splices that operate reliably at high voltages and temperatures, reducing electric field intensities and increasing the margin between operating voltage and electrical breakdown, thus extending the lifespan and performance of insulated conductor heaters in subsurface applications.
Implementation Method 1
A force is applied to the first plunger to compact the powder material into compacted powder material
Implementation Method 2
The compacted powder material forms a substantially cylindrical shape... placing a sleeve over the compacted powder material
Data Source
AI summary
A method for coupling ends of two insulated conductors includes coupling a core of a first insulated conductor to a core of a second insulated conductor. Exposed portions of the cores are located inside a box with an open top. Electrically insulating powder material is placed into the box and a first plunger is inserted through the open top of the box to compact the powder material. Additional electrically insulating powder material is placed into the box and a second plunger is inserted through the open top of the box to compact the powder material into compacted powder material that surrounds the exposed portions of the cores. The compacted powder material is formed into a substantially cylindrical shape. A sleeve is placed over the compacted powder material and coupling the sleeve to the jackets of the insulated conductors.