Extra-high-voltage power-cable systems and gas-pressurised dielectrics for use with them

1966 ◽  
Vol 113 (1) ◽  
pp. 159
Author(s):  
J.R. Harding ◽  
P.R. Howard ◽  
J.A.M. Gibbons ◽  
H.K. Beale ◽  
D.J. Skipper ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Cable ◽  
Cable Systems ◽  
Extra High Voltage

scholarly journals CAD FOR SOLVING EDUCATIONAL RESEARCH PROBLEMS WHEN DESIGNING MODERN HIGH AND EXTRA HIGH VOLTAGE CABLE LINES

2021 ◽  
Author(s):  
Valentin Gorin ◽  
Evgeniya Kut' ◽  
Irina Gulyaeva
Keyword(s):  
High Voltage ◽  
Computer Aided Design ◽  
Power Cable ◽  
Regulatory Requirements ◽  
Computer Aided ◽  
Research Problems ◽  
Cable Lines ◽  
Extra High Voltage ◽  
Aided Design ◽  
Xlpe Insulation

The development of teaching and research version of the computer aided design of cable lines of high and extra-high voltage is at the final stage. For TR CAD CL, software has been developed that allows solving design and research problems for a power cable for a voltage of 35-500 kV with XLPE insulation. The development of the documentary subsystem TR CAD CL, which fully meets the regulatory requirements, has been completed.

Partial Discharges Measurements for Power Cable Insulation System

2016 ◽  
pp. 334-350
Keyword(s):  
Computer Simulations ◽  
High Voltage ◽  
Partial Discharges ◽  
Simple Solution ◽  
Power Cable ◽  
Laboratory Measurements ◽  
Coupling Behavior ◽  
Additional Costs ◽  
Cable Systems ◽  
Detection Unit

On-site PD measurements on high voltage cables have to concentrate on the cable accessories because there is a remaining risk for assembling faults on site. PD sensors with an appropriate coupling behavior to accessory-internal PD give sensitivities of a few pC or even better. Unfortunately, two main reasons prevent the general use of PD sensors in cable accessories. First of all, the costs for PD sensors have to be balanced with the costs of the accessories, importance of the cable link, consequential costs for outage etc. This is the reason why PD sensors were mainly used EHV cable systems. The second reason is limited accessibility: the PD sensor cable at the accessory has to be connected to a PD detection unit. Accessibility is much more difficult for direct buried cable systems than for cable terminations and tunnel-laid cable systems: the senor cable must pass the ground and the end up in a box on the surface to provide access. This solution causes additional costs and new problems like sealing the sensor cable against humidity, capability to withstand sheath testing etc. By looking for alternative access to PD signals from cable joints of long cable systems, a very simple solution proved suitable: detecting PD at cross-bonding links. To investigate the high frequency propagation of PD pulses in cross-bonding links, computer simulations and laboratory measurements were done.

scholarly journals Sequence Impedances of Land Single-Core Insulated Cables: Direct Formulae and Multiconductor Cell Analyses Compared with Measurements

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1084 ◽  
Author(s):  
Roberto Benato ◽  
Sebastian Dambone Sessa ◽  
Michele Poli ◽  
Francesco Sanniti
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Technical Literature ◽  
Electric System ◽  
Asymmetric Power ◽  
Analyse Power ◽  
Power Frequency ◽  
Cable Systems ◽  
Extra High Voltage ◽  
First Time

The paper deals with the sequence impedances (positive/negative and zero sequences) of high- and extra-high-voltage land single-core insulated cables. In particular, it presents the comparisons between sequence impedance measurements and computations. The computations of the sequence impedances are carried out by means of the most important international normative and council references (IEC/Cigré) and of multiconductor cell analysis which is a consolidated and powerful tool developed by University of Padova in order to analyse power frequency regimes of multiconductor asymmetric power systems. The comparisons are presented with reference to four high- and extra-high voltage insulated cables, even if the available ones are much higher: however, the conclusions derived from these four reference cases are general and can be useful for transmission system operators and for power electric system engineers involved in insulated cables. The paper demonstrates, for the first time in technical literature, that direct formulae cannot correctly evaluate the sequence impedances of installed single-core land cable systems. Extensive on-field measurement campaigns have served to this purpose.

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