Underground Cable Fault Indicators

Faulted circuit indicators are attached to underground cable accessories such as 200 a and 600 a elbows and indicate the passage of fault current by showing an orange reflective target in its fisheye display. Sel designs and manufactures fault indicators and sensors supplying utilities around the world with products that help reduce fault finding time so that power can be restored quickly after a fault occurs. Cabletroll 2300 series fault indicators is a complete system for indication of phase to ground and phase to phase faults in underground 6 36 kv mv cable networks with multi core cables where sensors can be mounted in a safe area on the cable termination.

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Downstream of a fault the stored charge in the cable will rush into the fault possibly tripping fault indicators.

Underground cable fault indicators.

Sel underground autoranger fault indicators are reliable self adjusting settings free faulted circuit indicators suitable for applications with fault current ranging from 50 a to greater than 1 200 a. They are designed for a variety of underground applications and can be paired with a range of display options. The utility can easily identify the faulted cable section without a time consuming re fuse. This catalog describes features and ordering information for eaton s cooper power series s t a r.

Underground fault indicators are placed on each primary cable. The cabletroll indicators are fault current detectors for the underground medium voltage distri bution network 6 36kv. The quantity and location of the fault indicators should be sufficient to eliminate the need for the sectionalizing fault chasing method. Faulted circuit indicators can also be installed on cable terminations connected to pad mounted distribution transformers and switchgear.

Fault indicators can be installed on transformers switchgear sectionalizing cabinets bushing terminators overhead lines and underground cable. Elastimold underground cable accessories. If a fault causes a feeder fuse to operate the indicators upstream of the fault trip and the indicators after the fault remain untripped. Underground faulted circuit indicators specifications trip point 50 a 5 100 a 1 200 a 2 300 a 3 400 a 4 450 a 4 5 500 a 5 600 a 6 800 a 8.

Mcnulty 1994 reported that 2000 ft of 15 kv cable created an oscillatory current transient that peaked at 100 a and decayed in 0 15 msec. Sel is the electric power industry s leader in fault indicator technology producing the widest variety of fault indicator products. Some units will give separate indication for short cir. Overview of fault indicators.

Pathfinder variable trip test point faulted circuit indicators fci which quickly and easily locate faulted sections of underground cable systems. Nearby capacitor banks on the overhead system can make outrush worse. Line fault indicators consist of a solid state current sensor connected to a faulted circuit display. They are used to detect short circuit and earth faults and can be in stalled on most types of cable terminations.

Sensorform Range Of Cable Fault Indicators