Medium Voltage VFD Motor Cable — 3GSEGCH / 3GSEGCY

Medium voltage VFD cable connects a frequency converter to an AC motor through three EPR-insulated power cores, individual copper-tape screens and an overall copper screen. The 3GSEGCH and 3GSEGCY designs share this screened motor-supply arrangement, with different outer-sheath materials and installation conditions. Conductor sizes from 35 to 300 mm² remain together in the selection tables.

Choose the electrical operating condition before selecting the conductor size. The power-frequency rating is 6/10 kV at 50 Hz, while converter operation uses a separate 3.6/6 kV basis. The stated converter envelope also identifies a maximum link voltage, a fundamental voltage and a peak limit including harmonics. These values describe different parts of the drive waveform and should be checked against the converter output and motor insulation system.

Choose the sheath to suit the route. The halogen-free 3GSEGCH construction uses an ST8 polyolefin sheath and is intended for fixed installation away from direct burial and water installation. The PVC-sheathed 3GSEGCY construction permits direct burial, with continuous use in water excluded. Both designs have a red outer surface, black inner covering and numerical core identification.

Provide the converter waveform, motor voltage, conductor size, cable length and termination arrangement with the enquiry. Check the screen connection, gland space, pulling force and available fixed bend radius together. The current references apply to one cable at 40°C ambient; the installed route and grouping determine the final current selection.

Explore the industrial cable range for related configurations.

For low-voltage converter-fed motor drive circuits requiring symmetrical EMC screening, compare these VFD cable constructions: 2XSLCYK-J 0.6/1 kV XLPE VFD Motor Cable (for 0.6/1 kV XLPE-insulated motor feeders with low mutual capacitance and dual copper tape or braid screening); 2YSLCYK-JB 0.6/1 kV Symmetrical VFD Cable (for 0.6/1 kV symmetrical 3+3 core VFD motor leads with split protective earth conductors). Verify rated drive voltage, dV/dt impulse stress, and screen transfer impedance before ordering.

Construction

The representative 3GSEGCH 3 × 50 mm² construction has three round stranded copper conductors arranged as a compact triangle. Each EPR-insulated core has semiconductive field-control layers and copper-tape screening; the assembled cores have a black inner covering, an overall copper-wire screen and a red polyolefin sheath.

Applications

Select these screened three-core constructions for fixed medium voltage converter-to-motor power connections. Coordinate the cable insulation, screen termination and installation route with the drive system.

• Fixed connections between medium voltage frequency converters and AC motors in industrial drive systems.
• Indoor or outdoor fixed routes in dry, damp and wet surroundings, subject to the selected sheath and installation method.
• 3GSEGCH routes where a low-smoke halogen-free sheath is specified; install away from direct burial and water installation.
• 3GSEGCY routes that require a PVC sheath and permit direct burial; continuous use in water is excluded.
• Motor and converter terminations designed for the individual core screens and the common copper-wire screen.
• Use the selected fixed bend radius and pulling-force limit; the free-movement references do not define a continuous reeling or drag-chain duty.

For VFD motor drive engineering references and heavy-duty mining inverter feeders, consult these resources: What Is VFD Cable? Insulation, Grounds and Shield Explained (covering XLPE/EPR dielectric stress, symmetrical ground geometry, and high-frequency common-mode current containment); Mining VFD Cable 2000 V — 3 Power + 3 Ground + Ground Check (for 2000 V trailing and reeling mining inverter drives with three symmetrical grounds and a ground-check pilot). Confirm harmonic current derating, gland earthing termination, and installation bend radius.

Specifications

The current values are references for one cable touching supporting surfaces at 40°C ambient. Apply the installation method, grouping and thermal conditions to the final current calculation.

3GSEGCH current references follow VDE 0298 part 4. For 3GSEGCY direct burial, determine the installed current according to the ground-installation conditions and DIN VDE 0276-620 6C.

The 3GSEGCY short-circuit current figures retain their conductor-size references. Coordinate protection and fault-clearing duration with the conductor thermal limit.

Power-frequency, converter fundamental, link and peak voltages are separate selection conditions. Include the complete drive waveform and termination requirements with the enquiry.

Configuration dimensions, bend radii, masses and tensile-force values belong to their own model rows. Select the sheath and installation route before applying them.

Standards

IEC 60502-2 scope for medium voltage power cables