ABB CO User Manual

Instruction
Leaflet
A
IIII
nm
»
ABB
Power
T
&
D
Company
Inc
.
Relay
Divisions
Coral
Springs
,
FL
33065
41
-
103
H
Type
CO
Circuit
Opening
Overcurrent
Relay
Effective
:
May
1984
Supersedes
I
.
L
41
-
103
G
,
Dated
June
1976
O
Denotes
Change
Since
Previous
Issue
CAUTION
ELECTROMAGNET
Before
putting
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
.
The
electromagnets
for
the
types
CO
-
5
,
CO
-
6
,
CO
-
7
,
CO
-
8
and
CO
-
9
relays
have
a
main
tapped
coil
located
on
the
center
leg
of
an
“
E
"
type
laminated
structure
that
produces
a
flux
which
divides
and
returns
through
the
outer
legs
.
A
shading
coil
causes
the
flux
through
the
left
leg
to
lag
the
main
pole
flux
.
The
out
-
of
-
phase
fluxes
thus
produced
in
the
air
gap
cause
a
contact
closing
torque
.
APPLICATION
The
electromagnets
for
the
types
CO
-
2
and
CO
-
ll
relays
have
a
main
coil
consisting
of
a
tapped
primary
winding
and
a
secondary winding
.
Two
identical
coils
on
the
outer
legs
of
the
lami
-
nation
structure
are
connected
to
the
main
coil
secondary
in
a
manner
so
that
the
combination
of
all
the
fluxes
produced
by
the
electromagnet
result
in
out
-
of
-
phase
fluxes
in
the
air
gap
.
The
out
-
of
-
phase
air
gap
fluxes
produced
cause
a
con
-
tact
closing
torque
.
These
induction
overcurrent
relays
are
used
to
disconnect
circuits
or
apparatus
when the
current
in
them
exceeds
a
given
value
.
When
no
suitable
station
battery
is available
,
the
circuit
opening
type
relay
in
conjunction
with
a
-
c
series
trip
coil
is
used
to
trip
the
circuit
breaker
.
CONTENTS
This
instruction
leaflet
applies
to
the
following
types
of
circuit
opening
relays
:
DE
-
ION CONTACTOR
SWITCH
(
CS
)
Type
CO
-
2
Short
Time
Relay
Type
CO
-
5
Long
Time
Relay
Type
CO
-
6
Definite
Minimum
Time
Relay
Type
CO
-
7
Moderately
Inverse
Time
Relay
Type
CO
-
8
Inverse
Time
Relay
Type
CO
-
9
Very
Inverse
Time
Relay
Type
CO
-
l
1
Extremely
Inverse
Time
Relay
This
switch
is
a
small
a
-
c
solenoid switch
whose coil
is
energized
from
a
small
transformer
connected
in
the
main
current
circuit
.
A
cylin
-
drical
plunger
operates
a
spring
leaf
arm
with
a
silver
contact
surface
on
one
end
and
rigidly
fixed
to
the
frame
at
the other
end
.
The
overcurrent
unit
contacts
are
in
the
con
-
tactor
switch
coil circuit
and
when
they
close
,
the
solenoid
plunger
moves
upward
to
open
the de
-
ion
contacts
which
normally
short
circuit
the
trip
coil
.
These
contacts
are
able
to
transfer
the
heavy
current
due
to
a
short
circuit
and
permit
this
cur
-
rent to
energize
the breaker
trip
coil
.
CONSTRUCTION
AND
OPERATION
The
type
CO
relays
consist
of
an
overcurrent
unit
(
CO
)
,
a
de
-
ion
contactor
switch
(
CS
)
.
an
op
-
eration
indicator
(
01
)
and
an
indicating
instan
-
taneous
trip
(
IIT
)
when
required
.
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
Co
.
Inc
.
representative
should
be contacted
.
Printed
in
U
.
S
.
A
.
Courtesy of NationalSwitchgear.com

ABB CO Specifications

General

Brand	ABB
Model	CO
Category	Relays
Language	English

Summary

APPLICATION

CAUTION

General safety precautions before putting relays into service.

Relay Application Details

Describes the use of induction overcurrent relays for disconnecting circuits when current exceeds a set value.

CONSTRUCTION AND OPERATION

Electromagnet Design

Details the construction and flux generation mechanism of the relay's electromagnets.

De-ion Contactor Switch (CS)

Explains the CS unit's solenoid operation for opening trip coil circuits.

RELAY COMPONENTS

Operation Indicator (OI)

Explains the OI's function and mechanism for visually indicating relay operation.

Indicating Instantaneous Trip (IIT)

Details the IIT unit's operation for completing the trip circuit upon overcurrent.

RELAY CHARACTERISTICS

Characteristics Overview

Introduces available current ranges, taps, and general characteristics of the relays.

Energy Requirements

Provides detailed tables of energy requirements for various Type CO relay models.

Typical Time Curves

Graphical data showing time-current characteristics for different relay types and settings.

Time Curve Calibration Data

Summarizes calibration points for permanent magnet and electromagnet plug adjustments.

SETTINGS, TESTING, AND MAINTENANCE

CO Unit Settings

Explains how to set the overcurrent unit using tap settings and time dial positions.

Instantaneous Reclosing Adjustment

Describes the procedure for adjusting the CO unit contact for instantaneous reclosing.

Performance Checks

Details recommended checks for relay contacts, trip current, and time curve accuracy.

Routine Maintenance

Covers periodic inspection, testing, and cleaning of relay components.

Calibration Procedures

Step-by-step guide for calibrating various relay units and settings.

Renewal Parts and Repair

Information on ordering parts and factory repair services for the relays.