Power Cable Heating Chamber With Low-Conductivity Shielding
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Solution Overview
Problem
Existing power cable insulation systems face issues during restoration due to uneven heating and deformation caused by high frequency heating coils, which induce currents in the conductor, leading to excessive heating of the insulation system beyond the restoration area.
Innovation Solution
A pressurization and heating device with low conductivity material in the axially extending section to minimize current induction, combined with high frequency heating coils, ensures focused heating and minimizes deformation by maintaining optimal temperature profiles and pressure within the insulation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high frequency heating coils are used for inner heating of the insulation system, then heating efficiency is improved, but the insulation system outside the pressurisation and heating device is heated excessively causing deformation
Solution Approach 1:
The pressurisation and heating device incorporates an axially extending section made of low conductivity material (at most 1000 S/m at 20°C) that acts as a magnetic shield to concentrate the heating effect locally within the heating chamber, preventing excessive heating of the insulation system outside the device while maintaining efficient inner heating where needed
Solution Approach 2:
The low conductivity axially extending section serves as an intermediary element between the high frequency heating coils and the conductor, blocking the induction of harmful currents in the conductor while allowing the heating function to proceed effectively within the confined heating chamber
2Productivity
If high frequency heating coils are arranged around the heating chamber, then curing speed is improved, but current induction in the conductor causes excessive heating beyond the restoration area
Solution Approach 1:
The device creates a localized heating zone within the heating chamber by using the low conductivity axially extending section to confine the electromagnetic field, ensuring that high frequency heating coils can operate at high productivity without causing harmful effects to the insulation system outside the restoration area
Solution Approach 2:
The low conductivity material, which would normally be considered a limitation for heat transfer, is actually beneficial here as it blocks the propagation of electromagnetic currents beyond the heating chamber, converting what could be a harmful effect (current induction) into a beneficial containment mechanism that protects the surrounding insulation system
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 provides concentrated heating of the insulation system during restoration, reducing deformation risks and ensuring homogeneous curing without excessive heating, thus maintaining insulation integrity.
Implementation Method 1
high frequency heating coils are arranged around the heating chamber in the axially extending section for heating a conductor of a power cable
Implementation Method 2
an at least 20 cm long axially extending section which is primarily made of material at most having a conductivity of the order of 1000 S/m at 20° C.
Implementation Method 3
the pressurisation and heating device is configured to be pressurised to obtain a pressure higher than atmospheric pressure inside the heating chamber
Implementation Method 4
the pressurisation and heating device is configured to heat the insulation system
Implementation Method 5
high frequency heating coils are arranged around the heating chamber in the axially extending section for heating a conductor of a power cable to heat an insulation system layer that is being restored
Implementation Method 6
inner heating of the insulation system that is being restored during curing together with outer heating provided by the pressurisation and heating device
Implementation Method 7
high frequency heating coils are arranged around the heating chamber in the axially extending section for heating a conductor of a power cable
Data Source
AI summary
A pressurisation and heating device for restoring an insulation system of a power cable, the pressurisation and heating device including: a first part including a first channel configured to receive a portion of the power cable, a second part including a second channel configured to receive a portion of the power cable, wherein the pressurisation and heating device is configured to be set in a closed state in which the first channel faces the second channel thereby forming a heating chamber extending from a first end to a second end, opposite the first end, of the pressurisation and heating device, wherein the pressurisation and heating device is configured to be pressurised to obtain a pressure higher than atmospheric pressure inside the heating chamber when the power cable is arranged sealed in the heating chamber, wherein the pressurisation and heating device has an at least 20 cm long axially extending section which is primarily made of material at most having a conductivity of the order of 1000 S/m at 20° C.