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ABB

Effective: November 1998

Supersedes I.L. 41-766.1M, Dated August 1998

( | ) Denotes Changes since previous issue

CAUTION

Before putting protective relays into service,

remove all blocking which may have been

inserted for the purpose of securing the parts

during shipment. Make sure that all moving

parts operate freely. Inspect the contacts to

see that they are clean and close properly, and

operate the relay to check the settings and

electrical connections.

1.0 APPLICATION

The types SC and SC-1 current relays and the types

SV and SV-1 voltage relays are applicable where an

instantaneous plunger relay of high accuracy is

required. These relays are suitable for protective ser-

vice, and for auxiliary service where some of their

special features are desired. They are adjustable

over a wide range of voltage or current, are provided

with mechanical operation indicators, and have a cal-

ibrated scale which indicates the pickup setting. Both

contacts can readily be changed from "make" to

"break". The volt-ampere burden is low.

The SC and SV relays have a high ratio of dropout to

pickup (85 to 98% for the ac relays). The SC-1 and

SV-1 have a lower ratio of dropout to pickup (35 to

60% for the ac relays). The SV should not be used if

the normal applied voltage is in the vicinity of pickup

(plus or minus 10%).

All possible contingencies which may arise during installation, operation or maintenance, and all details and

variations of this equipment do not purport to be covered by these instructions. If further information is

desired by purchaser regarding this particular installation, operation or maintenance of this equipment, the

local ABB Power T&D Company Inc. representative should be contacted.

Printed in U.S.A.

ABB Automation Inc.

Substation Automation and Protection Division

Coral Springs, FL 33065

Type SC, SC-1

Instantaneous Current

and SV, SV-1Instantaneous

Voltage Relays

The SC may be used in fault detector applications

where direct energization of a breaker trip coil is

involved. It should not be used to energize a timer.

The SV should be used only in overvoltage applica-

tions.

2.0 CONSTRUCTION

The types SC, SC-1 and SV and SV-1 relays operate

on the solenoid principle. A U-shaped iron frame,

mounted on the molded base, supports the coil and

serves as the external magnetic path for the coil. The

coil surrounds a core and flux shunt. The upper end

of the core is threaded and projects through the

upper side of the frame, to which it is fastened by a

nut. A tube threaded on the outside at its lower end is

assembled in the core, and the threaded end extends

below the core. A Fluorosint

lower bearing for the plunger shaft, is assembled in

the lower end of this threaded tube. It is held in place

by two split spring sleeves, one above and one below

the bearing. The split sleeves must be compressed to

insert them in the tube and they will remain at any

position in which they are placed. The bearing for the

upper end of the plunger shaft is a Fluorosint

ing which is pressed in the upper end of the core.

This bearing is visible when the plunger is in the ener-

gized position. The plunger itself does not touch the

walls of the tube in which it moves.

A flux shunt which surrounds the core is screwed on

the tube, and its lower end projects below the relay

Registered Trademark of The Polymer Corp.

Instruction Leaflet

41-766.1N

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bushing, which is the

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bush-