Installation of a 230 kV XLPE insulated cable at Ontario

Aug 29 2019 (Concrete Core Testing - Hogs Back Dam

400 kV XLPE Cable System according to the relevant international standard IEC 62067 (2001) This test required one year of operation along with the thermal monitoring of all cables joints and terminations installed It was successfully completed at CESI Laboratory in Milan Italy in 2004

230 kV XLPE – Copper Conductor cable data Voltage Characteristics (kV) Max Voltage Rating 245 BIL Rating 1050 Temperatures (oC) Nominal Conductor 90 Max Emergency Conductor 105 Short Circuit Conductor 250 Minimum Installation -10 Design Characteristics Design Standards AEIC IEC Typical Test Voltages 330 kV / 30 min XLPE Loss Factor 0 0005

The application of XLPE insulated cables to ever higher voltages progressed in the 1990s with expansion to extra high voltage cables (cables rated over 345 kV) 1 In 2001 industrial specifications for XLPE insulated cables up to 500 kV were issued 2 Expansion of the applications for extruded dielectric XLPE high voltage cables including for

HIGH VOLTAGE XLPE CABLES 127/220 w 230(245)kV COPPER CONDUCTOR r 94 '- : acc IEC 62067 r 936)94 BDD ;/ #' Cross-section of conductor Diameter of conductor Insulation Copper screen Outer diameter of cable Weight of cable Max pulling force Min bending Average thick- radius ness Diameter over insulation Cross-section Diameter over screen

cable is a 230 kV 1600 mm² copper XLPE cable with a lead metallic sheath Installation: The project includes a segment of underground transmission line crossing the Patuxent river As permits were difficult to obtain for submarine cables because of oyster bars on both shorelines the only possible installation method was using HDD

UG-1: Connectors GreenbookConnectors for Insulated Cables Underground Distribution Systems 015251Page 20 of 39Rev #07: 03-25-22 Application Connectors are on Pages 20 and 21 are used for straight splice or tap Connectors for Splicing and Tapping Concentric Wires

Inner conductor shielding XLPE insulation and outer core shielding shall be extruded in one operation by special process (viz Triple Extrusion Process) to ensure that the insulation is free from contamination and voids and perfect bonding of inner and outer shielding with insulation is achieved

A total of 32 cir- cuits of 120kV cables will be installed 22 of which will be in duct banks on the top of the powerhouse Once again copper conductors were specified for the XLPE insulated cables in order to reduce the overall cable diameter as well as overall dimensions of associated duct banks

cable system are as follow: • XLPE insulation cable system in accordance with CIGRE TB496 and relevant IEC/CIGRE standard/recommendations • Transmission capacity of 1050MW at the rated voltage of DC 400kV • Maximum operating temperature of 90 deg-C (Higher than 55 deg-C of MI cable and 70 deg-C of other kind of DC XLPE cable)

crosslinked polyethylene (TR-XLPE) insulated cable are outlined in ANSI/ICEA S-94-649 clause 10 1 6 which is the accelerated water treeing test (AWTT) This testing defines the minimum AC withstand requirements for XLPE TR-XLPE and ethylene propylene rubber (EPR) insulated cable after wet aging (see Table 1)

XLPE cables can be loaded continuously to a conductor temperature of 90°C ? One three-core cable or one three-phase group of The dielectric losses of XLPE insulation are present also at no load Those losses depend on the operation voltage applied and shall be considered above 100 kV