Chicago Electric 92472 Specifications download pdf (Page 6)

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E. O. SCHWEITZER MANUFACTURING, A DIVISION OF SEL

SEL fault indicators sense the magnetic field produced by current flowing through a conductor. When fault current passes through the fault indicator,

the fault indicator “trips,” indicating a fault. Because SEL offers a variety of fault indicator displays, the trip might be indicated by a reflective target,

flashing light, or combination of the two display types. The Tamperproof Bolt Display, read by a compass-like tool, and RadioRANGER

™

Remote Fault

Reader provide other display options.

Line crews find the location of faults by isolating the section of line between the last tripped (red) fault indicator and the first untripped (white) fault indicator.

Normally open point

Fault Location

Untripped Fault Indicator

Tripped Fault Indicator

Fuse

FAULT INDICATORS AND SENSORS

Applying SEL Fault Indicators

Underground

In underground applications, a utility usually places a fault indicator

on each primary cable. If a fault causes a feeder fuse to operate, the

indicators upstream of the fault trip, and the indicators after the fault

remain in the untripped position. As a result, the utility can easily identify

the faulted section of cable without going through a time-consuming

re-fuse and sectionalize process.

Underground applications include subsurface or pad-mounted

transformers, subsurface or pad-mounted switchgear and sectionalizing

cabinets, junction boxes, and splices. An auxiliary contact option provides

SCADA compatibility.

The RadioRANGER Wireless Fault Indication System, designed for

underground vault applications, uses radio frequency to communicate

fault status to a handheld Remote Fault Reader (see page 20).

Overhead

When a fault occurs on an overhead system, the easy-to-spot displays on

the SEL fault indicators lead the line crew to the faulted section of line.

Overhead applications include unfused taps, long feeders with midline

reclosers or sectionalizers, overhead-to-underground transitions, and

feeders that experience recurring faults.

Applying fault counters and timed reset fault indicators in areas affected

by momentary outages and flickering lights is an efficient means of

identifying the location of temporary faults. This application of fault

indicators, designed to locate temporary faults, provides utilities with

the information to resolve these disruptions. Using fault indicators as a

tool reduces costs to utilities and their customers and improves utilities’

reliability indices.

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Chicago Electric 92472 Specifications Page 6

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