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Single-Phase AC Electric Railway 27.5kV XLPE Insulated Power Cable

This single-phase AC electric railway 27.5kV XLPE insulated power cable conforms to the standards of TB/T 2822-1997 as well as Q/321011 KLA32-2010, and it is applied for places with single phase, AC, power frequency, and rated voltage of 27.5kV, such as power line for electric railway, power line for auto-transformer, feeder lines of traction substation, partition station, switching station and auto-transformer, etc.

Max. Allowable Short Circuit Current
Nominal Cross Section (mm2) 150 185 240 300 400
Max. Allowable Short Circuit Current (kA) 21.4 26.4 34.3 42.9 57.2

Note: The short circuit lasts for 1 second, and the starting temperature is 90℃.

Code Explanations
Product Code TD PE inner sheath (isolation unit) Y
Low-halogen low-smoke DD Non-magnetic metal armoring 7
Halogen free low smoke WD Outer sheath
Copper conductor (T) Omitted PVC-based low halogen low smoke flame retardant outer sheath 2
XLPE insulation YJ PE-based halogen free low smoke flame retardant outer sheath 3
Model Descriptions
Model Descriptions
TDDD-YJY72 Cu core XLPE insulated aluminum wire armored low halogen low smoke flame retardant PVC sheathed power cable
TDWD-YJY73 Cu core XLPE insulated aluminum wire armored halogen free low smoke flame retardant PE sheathed power cable
Specifications
Model No. of Core Rated Voltage (kV) Preferred Conductor Cross Section Area (mm2)
TDDD-YJY72
TDWD-YJY73
1 27.5 150, 185, 240, 300, 400

Note: Other specifications are also available upon request.

Qualifications
No. Item Unit Standard Value
1 DC resistance of conductor Ω/km GB/T 3956
2 Partial discharge test at 1.73U0 pC ≤10
3 5min AC voltage test kV 97
4 Cable sheath electrical test kV 15
5 Hot set test (200℃, 15min, 20N/cm)
elongation / permanent elongation
% ≤175 / ≤15
6 Bending test and subsequent partial discharge test pC ≤5
7 Tan delta test ≤10×10-4
8 Thermal cycling test and subsequent partial discharge test pC ≤5
9 Impulse voltage test and subsequent AC voltage test pC ≤5
10 4h voltage test kV 110
Structural Parameters
Model Specification Nominal Insulation Thickness (mm) Outer Diameter (mm) Theoretical Weight (kg/km)
TDDD-YJY72
TDWD-YJY73
1×150 12 61.4 4441
1×185 12 63.2 4896
1×240 12 65.8 5590
1×300 12 67.9 6413
1×400 12 71 7549

Working Condition
1. Max. working temperature of conductor: 90℃
2. Max. temperature of conductor during short circuit: 250℃. The short circuit should lasts less than 5 seconds.
3. Min. ambient temperature when laying: 0℃
4. Min. bending radius: 15 times of cable overall diameter
5. This single-phase AC power cable is suitable for direct burying, and it can be installed in pipeline, cable duct, underground tunnel, etc. In addition, partially laying in the open air is also acceptable, and our product can be immersed in water frequently or periodically.

Related Names
Railway Power Supply Cable Manufacturer | Outdoor Electric Cable Installation | Halogen Free Wiring

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