End caps - An Overview
End caps - An Overview
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Link Boxes with Svl The inner connections are made via detachable links of tinned copper bars with specified cross-sections. ELECTRICAL Options Electrically, a link box need to be intended to withstand the voltage stresses developing below fault, and lightning & switching surge issue as established kV levels in Consumer Technical specs. Link boxes are functionally specified as : Cross Bonding Link Box for Joint
Optional PVC insulated earth continuity conductor needed to provide path for fault present-day, if coming back from earth is unwanted, such as inside a coal mine.
Standing voltage around the cable display is proportional for the length with the cable as well as magnitude of recent while in the Main.
Cross bonding system [two, 3, four] usually takes benefit of vector summation of more than one emf of different section angle. Consequently, the resultant EMF might be minimized or near ‘zero’ which substantially minimizes the undesired recent circulation and losses more than the cable sheath.
The parallel floor continuity conductor is often insulated to stay away from corrosion and transposed, In the event the cables are certainly not transposed, to avoid circulating currents and losses all through usual working situations.
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SVL is protecting device to limit induce voltages showing to the bonded cable system on account of shorter circuit.
So as to receive optimal final result, two ‘‘crosses’’ exist. One particular is Transposition of cable core crossing cable Main at Each and every section and next is Cross bond the cable screens properly no transposition of display.
A floor fault during the speedy vicinity on the cable may cause a considerable big difference in ground opportunity increase amongst The 2 finishes on the cable system, posing dangers to staff and tools.
Link Box is electrically and mechanically among the list of integral extras of HV underground over floor cable bonding procedure, affiliated with HV XLPE power cable techniques. Link boxes are used with cable joints and terminations to offer quick access to protect breaks for examination uses and to limit voltage Construct-up about the sheath. Lightning, fault currents and switching functions can cause overvoltages within the cable sheath.
There isn't any conventional approach prescribed by IEC or IEEE for choosing the optimum score for cable sheath/jacket protection.
For cross bonding, the cable size is split into three somewhere around equal sections. Transpose cable Main to stability the magnitude of induced voltages to generally be summed up. MECHANICAL Functions
Link Box is electrically and mechanically one of the integral add-ons of HV underground earlier mentioned floor cable bonding method, linked with HV XLPE electric power cable methods. Link boxes are utilised with cable joints and terminations to deliver easy accessibility to shield breaks for check needs also to Restrict voltage build-up over the sheath. Lightning, fault currents and switching operations can result in overvoltages over the cable sheath. End caps