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The different of High voltage single core and 3 core XLPE cable grounding modes

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-02-19

Usually three core cable with two grounding ways, because the cable is in operation, the total current flowing through the three conductor is zero, no induction voltage on the cable shielding layer are basically. (usually the cable 35kV voltage levels and below).

The single core cable (generally for cable 35kV and above voltage) generally cannot take the two ends directly grounding. The reason is: when the single core cable core current passing through the metal shielding layer will have induced currents, both ends of the cable will generate induced voltage. Current level and cable line induced voltage and the length of the flow through the conductor is proportional to, when the cable line short-circuit fault, lightning impulse or operating over-voltage, shielding will form induction voltage high. Will endanger the personal safety, or even breakdown of cable outer sheath.

Single core cable ends directly grounding, metallic shielding layer may also produce circulation circulation, according to reports at both ends of single core cable to cable core produced by normal transport current of 30%--80%, which not only reduces the waste of energy loss and the formation of flow, load cable, and accelerated the cable insulation aging, so the single core cables should not be grounded at both ends.

High pressure single core cable line installation, should be in accordance with the GB50217-1994 "cable design of electric engineering rules" requirements to take special grounding mode. General should be in accordance with the selection of different grounding lines, commonly used methods have:

1 The metal shielding layer is directly grounded, the other end of the sheath protector grounding;
2 The metal shielding layer grounding point directly, two ends of the sheath protector grounding;
3 The metal shielding layer is directly grounding, cable sheath cross connection grounding, the other end of the sheath protector grounding;
4 The metal shielding layer is directly grounded, a plurality of protective layer cross connection grounding, neutral directly grounding metal shielding layer, a plurality of protective layer cross connection grounding, the other end of the metal shielding layer directly grounding.
5 metal shielding layer are directly to ground (only applicable to short cables and small load cable).

You can visit http://www.qscable.com/power-cable/wire-armored-power-cable/High-Voltage-xlpe-Cables.html  to learn the specifications about  High voltage single core XLPE cable and High voltage 3 core XLPE cable.

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