Fault discriminator system in mixed sections of power line - Lumiker

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ELECTRICITY SECTOR

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Fault discriminator system in mixed sections (cable/overhead) of power line

Inserting a cable within a transport line means a change to its operating system, as the reclosing of that line must be blocked if there is a possibility that the failure has occurred in the cable. This means a loss of availability of the line, which can have a notable impact on the TIEPI (Interruption time equivalent to the installed capacity) estimator for that line.

The ODS system (Optical Discriminator System) monitors the cable sheath currents remotely by using optical technology for the current transformers.  A line differential protection (87L) is implemented with the sheath currents to establish whether the failure occurs in the underground cable section. If the fault is internal to the cable section, a contact is opened which blocks the triggering of the recloser. Thus, the recloser is allowed to be retriggered provided that the fault occurs in the overhead sections and is blocked if the fault occurs in the cable section. 

CHARACTERISTICS

Lumiker has developed an optical current sensor for the integrated management of underground cables.

 
SCG

This sensor would measure the leakage currents associated with the sheats of the power cables. The measure is derived from the current of a conventional current transformer, whose secondary is a coil which concentrates the magnetic field on a garnet which has a high Verdet constant.

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SCF

This sensor measures the current using a conventional optical fiber. Therefore, it is completely linear and is not subject to saturations. As it is oriented to underground cables, the main measure would be short circuit of it.

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SCM

It has two transformers on the outer envelope itself. On a same optical fiber it is possible to locate 6 sensors SCM, since each sensor has two current transformers.

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