New Overview of the 110kV Cable Accessories Composite Cable Termination

△Specification of Composite Cable Termination

Mounting base aperture: 320*320mm
Mounting bolt: 4*M20
Specification of outlet end fixture: φ40mm, φ45mm
Terminal height: 1810±10mm

△Standard of Composite Cable Termination

GB/T 21429(IEC61462):
Definitions, test methods, acceptance criteria and design recommendations for hollow composite insulators for outdoor and indoor electrical equipment.

DL 509:
Technical specification for ordering 110kV XLPE insulated cable and its accessories.

IEC 60840:
Extruded insulated power cables with rated voltage from 30kV (Um=36kV) to 150kV (Um=170kV) and their accessories -- Test methods and requirements.

GB/T 11017
Rated voltage 110kV XLPE insulated power cable and its accessories

The Main Performance of Composite Cable Termination

Rated operating voltage: 64/110kV
Maximum operating voltage: 126kV
Grounding method: Neutral-point solid ground
Transmission capacity: The same as connecting cables
Capacity of short circuit: The same as connecting cables
Environment temperature: -50℃~+50℃
Altitude: Less than 3000m
Shock resistance: More than Level 8, Ground horizontal acceleration 0.3g, Ground vertical acceleration 0.15g, Acting on three sine waves at once.
Maximum wind velocity: 37m/s

Type tests of Composite Cable Termination

The cable accessories shall be installed on the cable according to the specified process, and the type test shall be carried out as follows. The test method shall be carried out according to the provisions of IEC60840.

1.Partial discharge test at room temperature, 96kV, less than 5pC.

2.Constant voltage load cycle test, conductor temperature 95~100℃, 8h heating /16h cooling, power frequency voltage 128kV, 20 cycles.

3.Lightning impulse voltage test and subsequent power frequency voltage test, cable conductor temperature 95 ~ 100℃, lightning impulse 550kV±10 times, power frequency voltage 160kV, 30min no breakdown, no flashover.

4.4h power frequency voltage test, 192kV, 4h non-breakdown.

5.Pressure leakage test, the terminal under 0.2mpa pressure, no leakage 1h.