Página 2 - elastimold

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www.tnb.com
United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
H-62
Overview
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Loop system without tap protection: A fault on the tap will lock out the substation breaker
and create an outage for all customers to the open point.
Loop system with tap protection: A fault on the tap will be isolated by the fuses. This
reduces the number of customers affected by the outage, thus improving the System
Average Interruption Frequency Index (SAIFI).
Capable of interrupting in elevated ambient temperature,
Elastimold
®
fuses are built tough to take the heat!
Full-Range Current-Limiting Fuse
Low-Current Interruption Element
(Includes Patented Damage Sensor)
Tin-Plated
Brass Cap
Compacted Quartz Sand
High-Current
Interruption Element
Epoxy Joint
Soldered Electrical
Connection and Sealing
Mica Element Support
Resin-Rich Filament Wound Glass/Epoxy Body
Welded Element Joints
.625"
(15.9mm)
Improve Loop System Reliability by Adding Protection to a Tap.
B2
B2
I4
S3
B1
B2 14
Junction Cabinet
3-Way Unit
B2
S3
NC
NC
NC
NO
B1
B2
Junction Cabinet
3-Way Unit
B2 14
S3
NC
NC
NC
NO
Breaker Locks Out
Breaker Closed
Fuse Isolates Fault
NOTE: NC = normally closed
NO = normally opened
Elastimold
®
Fused Products cover a wide range of applications and ratings.
Fused Elbows (FLR), Molded Current-Limiting Fuses (MCLF) and Molded
Canister Fuses (MCAN) provide full-range protection through 50kA using
Hi-Tech
®
full-range fuses. The fuses in these products can easily be
replaced with minimal downtime. Fused load-break elbows provide low-
cost, convenient protection for radial taps, junctions, transformers and other
equipment. They combine the advantages of full-range current-limiting fusing
with the convenience of 15/25kV, 200A hotstick-operable, loadbreak elbow
switching. MCLF and MCAN are suitable for single-phase tap/load protection
and can be used in vault, subsurface or padmount installations.
Elastimold
®
Fused Products provide the benefits of current-limiting
protection, with fault clearing occurring in less than one-half cycle,thereby
limiting the let-through fault current and dramatically reducing stresses on
equipment. They also provide both overload and fault current protection for
distribution equipment in a single fuse body. As full-range fuses, they are
capable of interrupting any continuous current between the minimum current
that can cause melting of the elements and its rated maximum interrupting
current (50,000A). All fuses are capable of interrupting in elevated ambient
temperatures. Hi-Tech
®
fuse design features include:
A patented damage sensor that significantly reduces the risk of
fuse failure should the fuse be subjected to an element-damaging
current surge (e.g. lightning).
Hermetically sealed construction ensures that no gases escape
from the fuse during current interruption.
All fuses are helium mass spectrometer leak tested to ensure
sealing system integrity.
Rugged machined-brass end caps used for greater ferrule strength,
resulting in less distortion and a more secure fuse attachment.
Elastimold
®
FLR, MCLF and MCAN fused products constitute some of the
fastest and easiest ways to improve system reliability.
Example: Underground Loop System
Fault