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Application Guide

Three Phase Sectionalizer

Subject: Load Break Switch in Sectionalizing Applications

ENTEC Product: Solid Dielectric Load Break Switch with Vacuum Interrupter (LBS)

Sectionalizer Description

devices such as reclosing breakers or reclosers to automatically isolate faulted sections of

distribution lines. The sectionalizer senses current above a pickup value and counts when the

upstream device de-energizes the circuit. After meeting a predetermined count, and while the

circuit is de-energized, the sectionalizer opens. This allows for a section to be isolated without

locking out the entire circuit by the upstream device.

current, hence they are coordinated with an upstream recloser or breaker.

Three Phase Sectionalizer Advantages:

•

A sectionalizer easily coordinates with any protective device; they do not require time-

current curves. This is an advantage in high fault zones or deeper within a feeder

behind multiple curves having tight coordination.

•

Single phase damage is avoided with a three phase sectionalizer making it superior

versus fuses. When operated, all three phases simultaneously open.

•

Without a time-current curve, sectionalizers placed between reclosers and fuses provide

additional points of separation for strategic isolation.

•

Using state-of-the-art voltage restraint, the LBS sectionalizer will function between

reclosers. Utilities can now protect PME's without introducing another time-current curve

even with a recloser on the customer side.

•

LBS is equipped with a Schweitzer relay (SEL-751) and patent pending technology for

dependable, smart sectionalizing control.

analysis tools familiar to SEL customers.

•

Sectionalizers cost significantly less than reclosers.

•

The LBS can be switched manually or automatically and supports Scada.

Solution to Issue:

Reclosers cycle repeatedly for permanent faults eventually locking-out an entire distribution

system to isolate faults. These events often impact a significant number of customers and

result in extensive outages. Interruptions and downtime negatively impact reliability metrics

such as SAIFI, SAIDI, CAIFI and CAIDI.

Sectionalizers are used in tandem with upstream protective

Sectionalizers do not interrupt fault

SEL-751 includes metering and superb