ABB CO, CO-8, CO-9 Instruction Leaflet

Instruction Leaflet
ABB Power T&D Company Inc.
Power Automation & Protection Division
Coral Springs, FL 33065
Effective : January 1997
Supersedes 41-100I, Dated January 1990
41-100J
Type CO (HI-LO)
Overcurrent Relay
( | ) Denotes Change Since Previous Issue

File No. E103204
1.
!
CAUTION
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.
APPLICATION
The CO Relay is a single phase non-directional
time overcurrent device. It is used to sense current
level above the setting and normally is used to trip
a circuit breaker to clear faults. A wide range of
characteristics permit applications involving coordination with fuses, reclosers, cold load pickup, motor
starting, or essentially fixed time applications. AC
trip applications are described, but they are not recommended except in applications where a fault will
not reduce the ac voltage below a level at which
tripping will be reliable.
The following describes typical applications of the CO Relay:
RELAY
TYPE
TIME
CURVE
TYPICAL APPLICATIONS
CO-2
Short
1) Differential protection where saturation of current transformers is not expected, or where delayed tripping is permissible.
2) Overcurrent protection, phase or ground, where coordination with downstream devices is not involved and 2 to 60 cycle tripping is allowable.
CO-5
Long
Motor locked rotor protection where allowable locked rotor time is
approximately between 10 and 70 seconds.
CO-6
Definite
CO-7
Moderately Inverse
CO-8
Inverse
CO-9
Very Inverse
CO-11
Extremely Inverse
Overcurrent protection where coordination with downstream devices is not
involved and CO-2 is too fast. The operating time of this relay does not vary
greatly as current level varies.
1) Overcurrent protection where coordination with other divices are required, and generation varies.
2) Backup protection for relay on other circuits.
1) Motor Protection where allowable locked rotor time is less than 10 sec.
2) Overcurrent protection where coordination with fuses and reclosers is involved, or where cold load pickup or trnsformer inrush are factors.
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 of maintenance of this equipment, the local Asea
Brown Boveri representative should be contacted.
Courtesy of NationalSwitchgear.com
I.L 40-100J
2.
CONSTRUCTION AND OPERATION
The type CO relays consist of an overcurrent unit
(CO), either an Indicating Switch (ICS) or an ac Auxiliary Switch (ACS) and an Indicating Instantaneous
Trip unit (IIT) when required.
2.1
Electromagnet
The electromagnets for the types CO-5, CO-6, CO7, 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.
The electromagnets for the types CO-2 and CO-11
relays have a main coil consisting of a tapped primary winding and a secondary winding. Two identical
coils on the outer legs of the lamination 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 contact closing torque.
2.2
so, during the operation, two fingers on the armature
deflect a spring located on the front of the switch
which allows the operation indicator target to drop.
A core screw accessible from the top of the switch
provides the adjustable pickup range.
2.4
Indicating Instantaneous Trip Unit (IIT)
The instantaneous trip unit is a small ac operated
clapper type device. A magnetic armature, to which
leaf-spring mounted contacts are attached, is attracted to the magnetic core upon energization of the
switch. When the switch closes, the moving contacts
bridge two stationary contacts completing the trip circuit. Also, during the operation, two fingers on the armature deflect a spring located on the front of the
switch which allows the operation indicator target to
drop.
A core screw accessible from the top of the switch
and taps on the coil provide the adjustable pickup
range.
3.
CHARACTERISTICS
The relays are generally available in the following
current ranges:
Indicating Contactor Switch Unit (ICS)
Range
The dc indicating contactor switch is a small clapper
type device. A magnetic armature, to which-spring
mounted contacts are attached, is attracted to the
magnetic core upon energization of the switch.
When the switch closes, the moving contacts bridge
two stationary contacts, completing the trip circuit.
Also during this operation two fingers on the armature deflect a spring located on the front of the
switch, which allows the operation indicator target to
drop.
The front spring, in addition to holding the target,
provides restraint for the armature and thus controls
the pickup value of the switch.
2.3
AC Auxiliary Switch (ACS)
The ac auxiliary switch is a small ac operated clapper device. A magnetic armature, to which leafspring mounted contacts are attached, is attracted to
the magnetic core upon energization of the switch.
When the switch closes, the moving contacts bridge
two stationary contacts completing the trip circuit. Al2
Courtesy of NationalSwitchgear.com
Taps
.5 - 2.5
0.5, 0.6, 0.8, 1.0, 1.5, 2.0, 2.5
1 - 12
1.0, 1.2, 1.5, 2.0, 2.5, 3.0, 3.5,
4.0, 5.0, 6.0, 7.0, 8.0, 10.0, 12.0
These relays may have either single or double circuit
closing contacts for tripping either one or two circuit
breakers. The relays are wired per the internal schematics of Figure 1 to 9.
The time vs. current characteristics are shown in Figures 10 to 16. These characteristics give the contact
closing time for the various time dial settings when
the indicated multiples of tap value current are applied to the relay.
3.1
Trip Circuit
The main contacts will close 30 amperes at 250 volts
dc and the seal-in contacts of either the indicating
contactor switch or the ac auxiliary switch will carry
this current long enough to trip a circuit breaker.
I.L. 41-100J
The indicating instantaneous trip contacts will close
30 amperes at 250 volts dc and will carry this current
long enough to trip a breaker.
3.2
Indicating Contactor Switch (ICS)
a. The indicating contactor switch has two
taps that provide a pickup setting of 0.2 or 2
amperes. To change taps requires connecting the lead located in front of the tap block
to the desired setting by means of a screw
connection.
b. Trip Circuit Constants
0.2 amperes tap. . . . . . . 6.5 ohms dc
resistance
2.0 amperes tap. . . . . . . 0.15 ohms dc
resistance
3.3
ac Auxiliary Switch (ACS)
a. Each of the following ACS units is available
in the Hi-Lo Line of relays.
4.
INSTALLATION
The relays should be mounted on switchboard panels or their equivalent in a location free from dirt,
moisture, excessive vibration and heat. Mount the
relay vertically by means of the mounting stud for
projection mounting or by means of the four mounting holes on the flange for the semiflush mounting.
ACS
UNIT
CURRENT
RANGE
ASC/VOLTAGE
DROP
RANGE (1)
0.15
0.5
1.0
0.2-0.38
0.75-1.5
1.5-3.0
40-76
14-27
6.8-14
MINIMUM
RECOMMENDED
SUPPLY
VOLTAGE (2)
–
208
120
Notes: (1) This is the voltage range which will operate the ACS coil
only.
(2) When connected as a current switch in series with a full
rated voltage relay or trip coil.
Energy Requirements
ACS
UNIT
0.15
0.5
1.0
BURDEN IN
VOLT-AMPERES
AT MINIMUM
SETTINGS
4.5
4.5
4.5
THERMAL CAPACITY
AMPERE RATING (COIL)
1 SECOND CONTINUOUS
4.5
18.0
44.0
0.16
0.63
1.60
Either the stud or the mounting screws may be utilized for grounding the relay. The electrical connections may be made directly to the terminals by
means of screws for steel panel mounting or to the
terminal stud furnished with the relay for thick panel
mounting. The terminal stud may be easily removed
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
For detail information on the FT case refer to
I.L. 41-076.
5.
SETTINGS
5.1
CO Unit
The overcurrent unit setting can be defined by tap
setting and time dial position or by tap setting and a
specified time of operation at some current multiple
of the tap setting (e.g. 4 tap setting, 2 time dial position or 4 tap setting, 0.6 seconds at 6 times tap value
current). The tap setting is the minimum current required to make the disc move.
To provide selective circuit breaker operation, a minimum coordinating time of 0.3 seconds plus circuit
breaker time is recommended between the relay being set and the relays with which coordination is to
be effected.
The screw on the terminal plate above the time dial
makes connections to various turns on the operating
coil. By placing this screw in the various terminal
plate holes, the relay will respond to multiples of tap
value currents in accordance with the various typical
time-current curves.
!
CAUTION
Since the tap block screw on both the CO unit
and IIT unit carries operating current, be sure
that the screws are turned tight.
In order to avoid opening current transformer
circuits when changing taps under load, the relay must be first removed from the case. Chassis
operating shorting switches on the case will
short the secondary of the current transformer.
The taps should then be changed with the relay
outside of the case and then re-inserted into the
case.
3
Courtesy of NationalSwitchgear.com
I.L 40-100J
5.2
Instantaneous Reclosing
5.5
ac Auxiliary Switch (ACS)
The factory adjustment of the CO unit contacts provides a contact follow. Where circuit breaker reclosing will be initiated immediately after a trip by the CO
contact, the time of the opening of the contacts
should be a minimum. This condition is obtained by
loosening the stationary contact mounting screw, removing the contact plate and then replacing the
plate with the bent end resting against the contact
spring.
The core screw must be adjusted to the value of
pickup current desired.
For double trip relays, the upper stationary contact is
adjusted such that the contact spring rests solidly
against the back stop. The lower stationary contact
is then adjusted such that both stationary contacts
make contacts simultaneously with their respective
moving contact.
For relays which include an indicating instantaneous
trip unit (IIT), the junction of the induction and indicating instantaneous trip coils is brought out to
switch jaw #3. With this arrangement the overcurrent
units can be tested separately.
5.3
The following check is recommended to verify that
the relay is in proper working order:
Indicating Contactor Switch (ICS)
The only setting required on the ICS unit is the selection of the 0.2 or 2.0 amperes tap setting. This selection is made by connecting the lead located in front
of the tap block to the desired setting by means of
the connecting screw.
When the relay energizes a 125 or 250 volt dc type
WL relay switch, or equivalent, use the 0.2 ampere
tap; for 48 volt dc applications, use the 2.0 ampere
tap and use a type WL relay with a Style
#304C209G01 coil, or equivalent. The relay is
shipped set for 2.0 tap.
5.4
Indicating Instantaneous Trip (IIT)
The IIT setting is the level of ac current at which it will
pickup. It should be set to coordinate with other devices so it will never operate for a fault in a protective
zone where tripping should be produced by other devices. The transient reach will not exceed 130% for
an 80o circuit angle or 108% for a 60o circuit.
The proper tap must be selected and the core screw
must be adjusted to the value of pick-up current desired.
The nameplate data will furnish the actual current
range that may be obtained from the IIT unit. It is recommended that the IIT be set on the higher tap
where there is a choice of tap settings. For example,,
for a 20 amperes setting use the 20 to 40 tap rather
than the 6 to 20 tap.
4
Courtesy of NationalSwitchgear.com
6.
ADJUSTMENTS & MAINTENANCE
The proper adjustments to insure correct operation
of this relay have been made at the factory. Upon receipt of the relay no customer adjustments, other
than those covered under "SETTINGS" should be
required.
Performance Check
6.1
Contact
The index mark on the movement frame will coincide
with the "0" mark on the time dial when the stationary
contact has moved through approximately one-half
of its normal deflection. Therefore, with the stationary contact resting against the backstop, the index
mark is offset to the right of the "0" mark by approximately .020". The placement of the various time dial
positions in line with the index mark will give operating times as shown on the respective time-current
curves. For double trip relays, the follow on the stationary contacts should be approximately 1/32".
6.2
Minimum Trip Current
Set the time dial to position 6 using the lowest tap
setting, alternately apply tap value current plus 3%
and tap value current minus 3%. The moving contacts should leave the backstop at tap value current
plus 3% and should return to the backstop at tap value current minus 3%.
6.3
Time Curve
Table I shows the time curve calibration points for
the various types of relays. With the time dial set to
the indicated position apply the currents specified by
Table I, (e.g. for the CO-8, 2 and 20 times tap value
current) and measure the operating time of the relay.
I.L. 41-100J
The .5 to 2.5 amp relay and all CO-2 relays should
be set on the lowest tap. The 1 to 12 amp relay
should be set on the 2 amp tap with the exception of
1-12 amp. CO-2 relay which should be set on 1 amp
tap. The operating times should equal those of Table
I plus or minus 5%.
For type CO-11 relay only, the 1.30 times tap value
operating time from the number 6 time dial position
is 54.9 ± 5% seconds and should be checked first. It
is important that the 1.30 times tap value current be
maintained accurately. The maintaining of this current accurately is necessary because of the steepness of the slope of the time-current characteristic
(Figure 16). A slight variation, ± 1%, in the 1.3 times
tap value current (including measuring instrument
deviation) will change the timing tolerance to ± 10%
and the effects of different taps can make the total
variations appear to be ±15%.
6.4
Indicating Instantaneous Trip Unit (IIT)
The core screw which is adjustable from the top of
the trip unit and the tap located on the top of the IIT
determines the pickup value. The trip unit has a
nominal ratio of adjustment of 1 to 24.
The making of the contacts and target indication
should occur at approximately the same instant. Position the stationary contact for a minimum of 1/32"
wipe. The bridging moving contact should touch both
stationary contacts simultaneously.
Apply sufficient current to operate the IIT. The operation indicator target should drop freely.
6.5
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts
of the ICS. This value of current should be not greater than the particular ICS tap setting being used. The
operation indicator target drop freely.
The contact follow will be approximately 1/64" to 3/
64". The bridging moving contact should touch both
stationary contacts simultaneously.
at approximately the same instant. Position the stationary contact for a minimum of 1/32" wipe. The
bridging moving contact should touch both stationary contacts simultaneously.
Apply sufficient current to operate the ACS. The operation indicator target should drop freely.
Routine Maintenance
All relays should be inspected and checked periodically to assure proper operation. Generally a visual
inspection should call attention to any noticeable
changes. A minimum suggested check on the relay
system is to close the contacts manually to assure
that the breaker trips and the target drops. Then release the contacts and observe that the reset is
smooth and positive.
If an additional time check is desired, pass secondary current through the relay and check the time of
operation. It is preferable to make this at several
times pick-up current at an expected operating point
for the particular application. For the .5 to 2.5 amperes range CO-5 and CO-6 induction unit use the
alternative test circuit in Fig. 19 as these relays are
affected by a distorted waveform. With this connection the 25/5 amperes current transformers should
be worked well below the knee of the saturation (i.e.
use 10L50 or better).
All contacts should be periodically cleaned. A contact burnisher #182A836H01 is recommended for
this purpose.. The use of abrasive material for cleaning contacts is not recommended because of the
danger of embedding small particles in the face of
the soft silver and thus impairing the contact.
7.
Use the following procedure for calibrating the relay
if the relay has been taken apart for repairs or the adjustments disturbed. This procedure should not be
used until it is apparent that the relay is not in proper
working order. (See "Performance Check").
CO Unit
7.1
6.6
ac Auxiliary Switch (ACS)
The core screw which is adjustable from the top of
the ACS unit determines the pickup value. The making of the contacts and target indication should occur
CALIBRATION
Contact
The index mark on the movement frame will coincide with the "0" mark on the time dial when the
stationary contact has moved through approximately one-half of its normal deflection. Therefore,
5
Courtesy of NationalSwitchgear.com
I.L 40-100J
with the stationary contact resting against the backstop, the index mark is offset to the right of the "0"
mark by approximately .020". The placement of the
various time dial positions in line with the index mark
will give operating times as shown on the respective
time-current curves. For double trip relays, the follow
on the stationary contacts should be approximately
1/32".
7.2
Minimum Trip Current
The adjustment of the spring tension in setting the
minimum trip current value of the relay is most conveniently made with the damping magnet removed.
With the time dial set on "0", wind up the spiral spring
by means of the spring adjuster until approximately
6-3/4 convolutions show.
Set the .5-2.5 amp relay and all CO-2 relays on the
minimum tap setting. With the exception of CO-2 relay, set the 1-2 amp relay on the 2 amp tap setting.
Set the 1-12 amp CO-2 on the 1 amp tap. Set time
dial position 6 on all relays.
Adjust the control spring tension no that the moving
contact will leave the backstop at tap value current
+1.0% and will return to the backstop at tap value
current -1.0%.
7.3
Time Curve Calibration
Install the permanent magnet. Apply the indicated
current per Table I for permanent magnet adjustment (e.g. CO-8, 2 times tap value) and measure the
operating time. Adjust the permanent magnet keeper until the operating time corresponds to the value
of Table I.
For type CO-11 relay only, the 1.30 times tap value
operating time from the number 6 time dial position
is 54.9 ±5% seconds. It is important that the 1.30
times tap value current be maintained accurately.
The maintaining of this current accurately is necessary because of the steepness of the slope of the
time-current characteristic (Figure 16). A slight variation, ±1%, in the 1.3 times tap value current (including measuring instrument deviation) will change the
timing tolerance to _ 10% and the effect of different
taps can make the total variations appear to be
±15%. If the operating time at 1.3 times tap value is
not within these limits, a minor adjustment of the
6
Courtesy of NationalSwitchgear.com
control spring will give the correct operating time
without any undue effect on the minimum pick-up of
the relay. This check is to be made after the 2 times
tap value adjustment has been made.
Apply the indicated current per Table I for the electromagnet plug adjustment (e.g. CO-8, 20 times tap
value) and measure the operating time. Adjust the
proper plug until the operating time corresponds to
the value in Table I. (Withdrawing the left hand plug,
front view, increases the operation time withdrawing
the right hand plug, front view, decreases the time.).
In adjusting the plugs, one plug should be screwed
in completely and the other plug run in or out until the
proper operating time has been obtained.
Recheck the permanent magnet adjustment. If the
operating time for this calibration point has changed,
readjust the permanent magnet and then recheck
the electromagnet plug adjustment.
7.4
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts
of the ICS. This value of current should be not greater than the particular ICS tap setting being used. The
operation indicator target should drop freely.
For proper contact adjustment, insert a .030" feeler
guage between the core pin and the armature. Hold
the armature closed against the core pin and guage
and adjust the stationary contacts such that they just
make with the moving contact. Both stationary contacts should make at approximately the same time.
The contact follow will be approximately 1/64" to 3/
64".
7.5
ac Auxiliary Switch (ACS)
The core screw must be adjusted to the value of
pickup current desired. The nameplate data of the
ACS will furnish the actual current range that may be
obtained from the ACS unit.
7.6
Indicating Instantaneous Trip Unit (IIT)
The proper tap must be selected and the core screw
adjusted tothe value of pickup currentdesired.
The nameplate data and tap plate of the IIT will furnish the actual current range that may be obtained
from the IIT unit.
I.L. 41-100J
TABLE 1
TIME CURVE CALIBRATION DATA
50 AND 60 Hertz
PERMANENT MAGNET ADJUSTMENT
RELAY
TYPE
TIME
DIAL
POSITION
CURRENT
(MULTIPLES OF
TAP VALUE)
OPERATING
TIME
SECONDS
CO-2
CO-5
CO-6
CO-7
CO-8
CO-9
CO-11
6
6
6
6
6
6
6
3
2
2
2
2
2
2
0.57
37.80
2.46
4.27
13.35
8..87
11.27
8.
RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be
furnished to the customers who are equipped for
doing repair work. When ordering parts always
give the complete nameplate data.
ELECTROMAGNET PLUGS
CO-2
CO-5
CO-6
CO-7
CO-8
CO-9
CO-11
∆
6
6
6
6
6
6
6
20
10
20
20
20
20
20
0.22
14.30
1.19
1.11
1.11
0.65
0.24 ∆
For 50 Hz. CO-11 relay 20 times operating time limits are
0.24 + 20% -5%.
7
Courtesy of NationalSwitchgear.com
I.L 40-100J
8
Courtesy of NationalSwitchgear.com
I.L. 41-100J
ENERGY REQUIREMENTS
INSTANTANEOUS TRIP UN IT(IIT)
60 HERTZ BURDEN (NOTE 1 FOR 50 HZ)
TYPE
OF
IIT
UNIT
RANGES
AVAILABLE
WITH CORE
ADJUSTMENT
2-48
6-144
2-7
7-14
14-48
6-20
20-40
40-144
AT PICKUP
TAP
SETTING
MINIUM
PICKUP
2-7
7-14
14-48
6-20
20-40
40-144
2
7
14
6
20
40
R
.68
.076
.032
108
.016
.007
XL
Z
.42
.048
.012
.067
.008
.002
.8
.09
.035
.127
.018
.007
3
TIMES
PICKUP
.72
.086
.035
.125
.018
.007
OHMS
10
TIMES
PICKUP
.67
.075
.035
.125
.018
.007
20
TIMES
PICKUP
CONT.
RATING
AMPS
1 SECO ND
RATING
AMPS
2.5
7
10
7
16
25
70
140
185
88
280
460
.67
.075
.035
.100
.018
.007
NOTE 1. 50 Hz values for Z and OHMS are 96% to 100% of 60 Hz Values.
CO-2 SHORT TIME RELAY
60 HERTZ VOLT AMPERES**(x∆ FOR 50 HZ)
AMPERE
RANGE TAP
0.5/2.5
1/12
0.5
0.6
0.8
1.0
1.5
2.0
2.5
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
7.0
8.0
10.0
12.0
AT
CONTINUOUS ONE SECOND POWER TAP VALUE
RATING
RATING
FACTOR CURRENT
(AMPERES) (AMPERES)
ANGLE ø (∆ = 0.86)
0.91
0.96
1.18
1.37
1.95
2.24
2.50
1.65
1.90
2.20
3.30
4.00
5.00
5.50
6.50
7.10
8.80
9.50
10.50
12.00
13.00
28
28
28
28
28
28
28
28
28
28
28
56
56
56
56
230
230
230
230
230
230
58
57
53
50
40
36
29
55
54
53
54
56
55
54
53
53
50
48
46
40
35
4.8
4.9
5.0
5.3
6.2
7.2
7.9
4.6
4.6
4.8
4.8
4.7
4.9
4.9
4.8
5.1
5.2
5.7
6.2
6.8
7.8
AT 3 TIMES
TAP VALUE
CURRENT
(∆ = 0.88)
39.6
39.8
42.7
45.4
54.4
65.4
73.6
37.3
38.0
40.0
40.5
39.2
40.2
41.0
41.0
42.7
44.0
48.5
53.0
61.0
0
AT 10 TIMES AT 20 TIMES
TAP VALUE TAP VALUE
CURRENT
CURRENT
(∆ = 0.9)
(∆ = 0.91)
256
270
308
348
435
580
700
266
280
310
315
282
295
312
325
330
360
390
475
565
680
790
851
1024
1220
1740
2280
285
895
1000
1150
1180
970
1050
1125
1150
1200
1350
1600
1800
2500
3300
Thermal capacities for short times other than one second may be calculated on the basis of times being inversely proportional to the
square of the current
ø Degrees current lags voltage at tap value current
** Voltages taken with Rector type voltmeter
9
Courtesy of NationalSwitchgear.com
I.L 40-100J
ENERGY REQUIREMENTS
CO-5 LONG TIME AND CO-6 DEFINITE MINIMUM TIME RELAYS
60 HERTZ VOLT AMPERES**(x∆ FOR 50 HZ)
RANGE
0.5/2.5
1/12
TAP
RATING
(AMPERES)
RATING
(AMPERES)
FACTOR
ANGLE ø
0.5
2.7
88
69
0.6
0.8
1.0
1.5
2.0
2.5
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
7.0
8.0
10.0
12.0
3.1
3.7
4.1
5.7
6.8
7.7
4.5
5.5
6.0
7.7
9.5
10.0
12.0
13.5
15.0
17.5
20.5
22.5
23.5
26.5
88
88
88
88
88
88
88
88
88
88
88
230
230
230
230
460
460
460
460
460
68
67
66
62
60
58
69
68
67
66
65
65
65
64
61
60
57
53
48
42
AT
TAP VALUE
CURRENT
(∆ = 0.86)
AT 3 TIMES
TAP VALUE
CURRENT
(∆ = 0.88)
AT 10 TIMES
TAP VALUE
CURRENT
(∆ = 0.9)
AT 20 TIMES
TAP VALUE
CURRENT
(∆ = 0.91)
3.93
20.6
103
270
3.96
3.96
4.07
4.19
4.30
4.37
3.98
3.98
4.00
3.98
3.98
4.02
4.06
4.12
4.18
4.35
4.44
4.54
4.80
5.34
20.7
21
21.4
23.2
24.9
26.2
21.0
21.3
21.8
21.9
22.2
22.5
23.2
23.5
24.6
25.8
27.0
28.6
32.5
37.9
106
114
122
147
168
180
100
103
109
115
122
125
132
137
150
165
185
211
266
325
288
325
360
462
548
630
265
282
308
340
363
366
402
420
500
570
630
736
940
1152
103
107
114
122
148
174
185
100
104
110
117
123
127
131
136
153
165
189
206
250
342
278
288
320
356
459
552
640
265
270
300
312
360
390
413
420
490
528
630
732
970
1224
CO-7 MODERATELY INVERSE TIME RELAY
0.5/2.5
1/12
0.5
0.6
0.8
1.0
1.5
2.0
2.5
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
7.0
8.0
10.0
12.0
2.7
3.1
3.7
4.1
5.7
6.8
7.7
4.5
5.5
6.0
7.7
9.5
10.0
12.0
13.5
15.0
17.5
20.5
22.5
23.5
26.5
88
88
88
88
88
88
88
88
88
88
88
88
230
230
230
230
460
460
460
460
460
68
67
66
64
61
58
56
68
67
66
65
64
63
63
63
60
58
54
50
46
42
3.88
3.93
3.93
4.00
4.08
4.24
4.38
3.86
3.82
3.92
3.90
3.90
3.92
3.97
4.02
4.11
4.29
4.43
4.50
4.81
5.04
20.7
20.9
21.1
21.6
22.9
24.8
25.9
20.6
20.4
21.2
21.8
21.8
22.5
22.7
22.9
24.1
25.5
27.3
30.8
32.6
36.9
Thermal capacities for short times other than one second may be calculated on the basis of time being inversely proportional to the
square of the current.
øDegrees current lags voltage at tap value current
10
* * Voltages taken with Tectox type voltmeter
Courtesy of NationalSwitchgear.com
I.L. 41-100J
ENERGY REQUIREMENTS
CO-8 INVERSE TIME AND CO-9 VERY INVERSE TIME RELAYS
60 HERTZ VOLT AMPERES**(x∆ FOR 50 HZ)
AMPERE
RANGE
0.5/2.5
1/12
TAP
CONTINUOUS
RATING
(AMPERES)
0.5
0.6
0.8
1.0
1.5
2.0
2.5
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
7.0
8.0
10.0
12.0
2.7
3.1
3.7
4.1
5.7
6.8
7.7
4.5
5.5
6.0
7.7
9.5
10.0
12.0
13.5
15.0
17.5
20.5
22.5
23.5
26.5
0.5
0.6
0.8
1.0
1.5
2.0
2.5
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
7.0
8.0
10.0
12.0
1.7
1.9
2.2
2.5
3.0
3.5
3.8
3.5
4.0
5.5
8.5
10.0
12.5
14.0
15.0
17.0
18.5
20.0
21.5
25.0
28.0
ONE SECOND POWER
RATING
FACTOR
(AMPERES)
(AMPERES)
88
88
88
88
88
88
88
88
88
88
88
88
230
230
230
230
460
460
460
460
460
72
71
69
67
62
57
53
73
73
72
69
68
67
66
65
63
60
57
55
48
45
AT
TAP VALUE
CURRENT
(∆ = 0.86)
3.38
2.38
2.40
2.42
2.51
2.65
2.74
2.33
2.33
2.35
2.35
2.36
2.37
2.38
2.40
2.40
2.47
2.51
2.52
2.77
2.94
AT 3 TIMES
TAP VALUE
CURRENT
(∆ = 0.88)
21
21
21.1
21.2
22
23.5
24.8
20
20
20.1
20.2
20.3
20.4
20.9
21.0
21.0
21.6
21.8
22.2
24.5
25.4
AT 10 TIMES
TAP VALUE
CURRENT
(∆ = 0.9)
AT 20 TIMES
TAP VALUE
CURRENT
(∆ = 0.91)
132
134
142
150
170
200
228
135
135
142
145
146
149
153
157
164
170
180
192
230
258
350
365
400
440
530
675
800
347
361
383
412
415
420
450
460
500
525
600
672
830
960
71.8
75.0
84.0
93.1
115.5
136.3
160.0
82
87
93
96
96
88
88
96
110
120
135
160
210
276
250
267
298
330
411
502
610
300
324
350
380
377
340
340
366
435
478
560
648
900
120
CO-11 EXTREMELY INVERSE TIME RELAY
0.5/2.5
1/12
56
56
56
56
56
56
56
56
56
56
56
56
230
230
230
230
460
460
460
460
460
36
34
30
27
22
17
16
30
29
26
25
24
33
31
29
25
22
20
19
14
10
0.72
0.75
0.81
0.89
1.13
1.30
1.48
0.82
0.90
0.97
1.00
1.10
0.87
0.88
0.94
1.10
1.25
1.40
1.50
1.9
2.4
6.54
6.80
7.46
8.30
10.04
11.95
13.95
7.4
8.0
8.6
8.9
9.0
8.0
8.2
8.7
10.0
11.5
12.3
14.0
18.3
23.8
Thermal capacities for short times other than one second may be calculated on the basis of times being inversely proportional to
the square of the current
øDegrees current lags voltage at tap value current
* * Voltages taken with Rector type voltmeter
Courtesy of NationalSwitchgear.com
11
I.L 40-100J
INDICATING
CONTACTOR
SWITCH
INDUCTION UNIT
ICS
RED HANDLE
TEST SWITCH
CURRENT TEST JACK
CHASSIS OPERATED
SHORTING SWITCH
TERMINAL
Sub 3
57D4524
Figure 1. Internal Schematic of the Double Trip Relay Without IIT
12
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 1
3498A03
Figure 2. Internal Schematic of the Double Trip Relay With IIT
13
Courtesy of NationalSwitchgear.com
I.L 40-100J
Sub 3
57D4523
Figure 3. Internal Schematic of the Single Trip Relay Without IIT
14
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 1
3498A02
Figure 4. Internal Schematic of the Single Trip Relay With IIT
15
Courtesy of NationalSwitchgear.com
I.L 40-100J
Sub 1
3508A73
Figure 5. Internal Schematic of Double Trip Relay With ITT to Separate Terminals
16
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 2
3516A07
Figure 6. Internal Schematic of the Single Trip Relay With ITT Contacts Wired to Two Separate Terminals
17
Courtesy of NationalSwitchgear.com
I.L 40-100J
Sub 6
183A608
Figure 7. Internal Schematic of the Single Trip Relay With an ACS Unit
18
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 4
3515A06
Figure 8. Internal Schematic of the Single Trip Relay With an ACS Unit and IIT
19
Courtesy of NationalSwitchgear.com
I.L 40-100J
Sub 1
3524A37
Figure 9. Internal Schematic of the Single Trip Relay With an ACS Unit and with IIT Contacts
Wired to Two Separate Terminals
20
Courtesy of NationalSwitchgear.com
I.L. 41-100J
MULTIPLES OF TAP VALUE
Curve 619584
Figure 10. Typical Time Curve of the Type CO-2 Relay
21
Courtesy of NationalSwitchgear.com
I.L 40-100J
Curve 418245
Figure 11. Typical Time Curve of the Type CO-5 Relay
22
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Curve 418246
Figure 12. Typical Time Curve of the Type CO-6 Relay
23
Courtesy of NationalSwitchgear.com
I.L 40-100J
Curve 418247
Figure 13. Typical Time Curve of the Type CO-7 Relay
24
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Curve 418248
Figure 14. Typical Time Curve of the Type CO-8 Relay
25
Courtesy of NationalSwitchgear.com
I.L 40-100J
Curve 418249
Figure 15. Typical Time Curve of the Type CO-9 Relay
26
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 2
288B655
Figure 16. Typical Time Curve of the Type CO-11 Relay
27
Courtesy of NationalSwitchgear.com
I.L 40-100J
NEG.
OR
POS.
ICS
ICS
DEVICE NUMBER CHART
51 - OVERCURRENT RELAY, TYPE CO
51-N - GROUND OVERCURRENT TELAY, TYPE CO
52 - POWER CIRCUIT BREAKER
52A - BREAKER AUXILIARY CONTACT
ICS - INDICATING CONTACTOR SWITCH
TC - BREAKER TRIP COIL
NEG.
OR
POS.
Sub 3
182A755
Figure 17. External Schematic of HiLo CO Relay for Phase and Ground Overcurrent
Protection on a Three Phase System
Sub 1
3527A93
Figure 18. External Schematic of HiLo CO Relay with ACS Unit for Phase and Ground
Protection on a Three Phase System
28
Courtesy of NationalSwitchgear.com
I.L. 41-100J
Sub 3
3503A43
Figure 19. Siagram of Test Connections for the Type CO Relay
29
Courtesy of NationalSwitchgear.com
I.L 40-100J
RELAY TYPE
FIRST 7 DIGITS OF STYLE NO.
C0-2
CO-5
CO-6
CO-7
CO-8
CO-9
CO-11
LAST
THREE
DIGITS
OF STYLE
NUMBER
RANGE
CO
265C195
264C897
264C898
264C899
264C900
264C901
265C047
RANGE
IIT
DESCRIPTION
SCHEMATIC
60 HZ 50 HZ
A01
A21
.5-2.5
---
SINGLE TRIP
A02
A22
.5-2.5
---
DOUBLE TRIP
A03
A23
.5-2.5
2-48
SINGLE TRIP
A04
A24
.5-2.5
2-48
DOUBLE TRIP
A05
A25
1-12
---
SINGLE TRIP
A06
A26
1-12
---
DOUBLE TRIP
A07
A27
1-12
6-144
SINGLE TRIP
A08
A28
1-12
6-144
DOUBLE TRIP
A09
A29
.5-2.5
6-144
SINGLE TRIP
A10
A30
.5-2.5
6-144
DOUBLE TRIP
A11
A31
1-12
2-48
SINGLE TRIP
A12
A32
1-12
2-48
DOUBLE TRIP
A13
A33
.5-2.5
2-48
DOUBLE TRIP
A14
A34
1-12
6-144
DOUBLE TRIP
A15
A35
.5-2.5
6-144
DOUBLE TRIP
A16
A36
1-12
2-48
DOUBLE TRIP
A17
---
.5-2.5
2-48
SINGLE TRIP
A18
A38
1-12
6-144
SINGLE TRIP
A19
---
.5-2.5
6-144
SINGLE TRIP
A20
A40
1-12
2-48
SINGLE TRIP
WITH IIT CONTACTS WIRED
TO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO TWO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO TWO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO TWO SEPARATE TERMINALS
WITH IIT CONTACTS WIRED
TO TWO SEPARATE TERMINALS
57D4523
(FIG. 3)
57D4524
(FIG.1)
3498A02
(FIG.4)
3498A03
(FIG.2)
57D4523
(FIG. 3)
57D4524
(FIG.1)
3498A02
(FIG.4)
3498A03
(FIG.2)
3498A02
(FIG.4)
3498A03
(FIG.2)
3498A02
(FIG.4)
3498A03
(FIG.2)
3508A73
(FIG.5)
3508A73
(FIG.5)
3508A73
(FIG.5)
3508A73
(FIG.5)
3516A07
3516A07
3516A07
3516A07
Sub 60
775B349
Figure 20. Style Descriptions of CO Relay with ICS Unit.
30
Courtesy of NationalSwitchgear.com
I.L. 41-100J
LAST
THREE
DIGITS OF
STYLE NO.
60 HZ 50 HZ
RELAY
TYPE
RANGE
CO
A01
C0-11
A02
ACS
UNITS
IN AMPS
RANGE
IIT
1-12
.5
-
SINGLE TRIP
183A680
CO-11
1-12
1.0
-
SINGLE TRIP
183A680
A03
CO-8
1-12
1.0
-
SINGLE TRIP
183A680
A04
CO-5
1-12
1.0
-
SINGLE TRIP
183A680
A05
CO-5
1-12
1.0
6-144
SINGLE TRIP
3515A06
A06
CO-9
1-12
1.0
6-144
SINGLE TRIP
3515A06
A07
CO-11
1-12
0.5
6-144
SINGLE TRIP
3515A06
A08
CO-9
1-12
1.0
-
SINGLE TRIP
183A680
A09
CO-9
1-12
0.5
-
SINGLE TRIP
183A680
A10
CO-9
1-12
0.5
6-144
SINGLE TRIP
3515A06
A11
CO-2
1-12
0.5
6-144
SINGLE TRIP
3515A06
A12
CO-5
.5-2.5
0.5
-
SINGLE TRIP
183A680
A13
CO-2
1-12
1.0
6-144
SINGLE TRIP
3515A06
A14
CO-9
.5-2.5
1.0
2-48
SINGLE TRIP
3515A06
CO-8
1-12
1.0
6-144
SINGLE TRIP
3515A06
A16
CO-11
1-12
1-0
6-144
SINGLE TRIP
3515A06
A18
CO-8
1-12
,5
6-144
SINGLE TRIP
3515A06
A19
CO-11
.5-2.5
.5
-
SINGLE TRIP
183A680
A20
CO-7
1-12
1.0
-
SINGLE TRIP
183A680
A23
CO-8
.5-2.5
1.0
-
SINGLE TRIP
183A680
A24
CO-5
.5-2.5
1.0
-
SINGLE TRIP
183A680
A25
CO-11
1-12
.15
6-144
SINGLE TRIP
3515A06
A26
CO-8
.5-2.5
.15
2-48
SINGLE TRIP
3515A06
A27
CO-5
1-12
.15
-
SINGLE TRIP
183A680
A28
CO-8
1-12
0.5
2-48
SINGLE TRIP
3515A06
A29
CO-6
1-12
1.0
-
SINGLE TRIP
183A680
A30
CO-8
1-12
1.0
SINGLE TRIP
3524A37
A31
CO-9
.5-2.5
0.5
-
SINGLE TRIP
183A680
A32
CO-11
.5-2.5
1.0
-
SINGLE TRIP
183A680
A33
CO-11
.5-2.5
1.0
2-48
SINGLE TRIP
3515A06
A17
A15
6-144
DESCRIPTION
Figure 21. Style Description of CO Relays with ACS Units
SCHEMATIC
Sub 60
775B349
31
Courtesy of NationalSwitchgear.com
I.L 40-100J
* Sub 20
57D7900
Figure 22. Outline and Drilling Plan for the Type CO Relay
*Denotes Change Since Previous Issue
32
Courtesy of NationalSwitchgear.com