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ABB Automation Inc.
Substation Automation and Protection Division
Coral Springs, FL 33065
Instruction Leaflet
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.
Type CV Voltage Relay
Class 1E Applications
Effective: November 1999
Supersedes I.L. 41-201.4G, dated January 1997
( ) Denotes changes since previous issue
CONTENTS
This instruction leaflet applies to the follow-
ing types of relays:
• CV-1 Long Time Undervoltage Relay
• CV-2 Short Time Undervoltage Relay
• CV-4 Long Time Overvoltage Relay
• CV-5 Short Time Overvoltage Relay
• CV-6 Long Time Over or Undervoltage Relay
• CV-7 Short Time Over or Undervoltage Relay
• CV-8 Low Voltage Pickup Overvoltage Relay
!
CAUTION
Before putting relays into service, remove all
blocking which may have been inserted for the
purpose of securing the parts during ship-
ment, 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 con-
nections.
1.0
APPLICATIONS
These relays have been specially designed and
tested to establish their suitability for Class 1E appli-
cations in accordance with the ABB Power T&D Com-
pany program for Class 1E Qualification Testing as
detailed in bulletin STR-1.
“Class 1E” is the safety classification of the electric
equipment and systems in nuclear power generating
stations that are essential to emergency shutdown of
the reactor, containment isolation, cooling of the reac-
tor, and heat removal from the containment and reac-
tor, or otherwise are essential in preventing significant
release of radioactive material to the environment.
The type CV relays are single-phase induction-disc
type relays operating either on under or over voltage
or both. These relays are applied as a voltage fault
detector operating in conjunction with other protective
relays. The relays are also used as timing devices for
various automatic operations.
2.0
CONSTRUCTION and OPERATION
The types CV-1, CV-2, CV-4, CV-5, CV-6 and CV-7
relays consist of a voltage unit, an auxiliary telephone
type relay and an indicating contactor switch (ICS).
The principal component parts of the relay and their
location are shown in Figure 1 (page 2).
The type CV-8 relay in addition to the above compo-
nents also has a capacitor which is series tuned with
the main coil of the electromagnet. This tuned circuit
41-201.4H
41-201.4H
CV Voltage Relay Class 1E
2
2.1.
VOLTAGE UNIT (CV)
The overvoltage unit operates on the induction-disc
principle. A main tapped coil located on the center
leg of an “E” type laminated structure produces a flux
which divides and returns through the outer legs. A
shading coil causes the flux through the left leg (front
view) to lag the main pole flux. This causes the out-
of-phase fluxes to produce a contact opening torque.
The undervoltage unit operates on the same princi-
ple as the overvoltage unit except the shading coil is
on the right leg (front view). This causes the out-of-
phase fluxes to produce a contact opening torque.
2.2.
INDICATING CONTACTOR SWITCH UNIT
(ICS)
The dc indicating contactor switch is a small 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
offers a low impedance to fundamental current and a
high impedance to third harmonic currents. Hence,
the relay has a low pickup value for fundamental volt-
age and much higher value of pickup for third har-
monic voltage. At rated voltage the electromagnet is
saturated causing the circuit to be detuned. The
impedance of the circuit is increased and limits the
fundamental current to a safe value. Figure 2 and 3
show CV-8 relays with adjustable pickup.
Internal schematics are shown in Figures 4 through
10 (beginning on page 9).
Photo not available at this time
Figure 1: Type CV Relay Without FT11 Case
Figure 2: 199 Volt Type CV-8 Relay With Adjustable
Pickup Without FT11 Case
Figure 3: 67 Volt Type CV-8 Relay with Adjustable Pickup
without FT-21 Case
CV Voltage Relay Class 1E
41-201.4H
3
two stationary contacts, completing the trip circuit.
For double circuit closing contacts, the moving con-
tacts bridge three stationary contacts. 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 same unit is also used as a Trip Indicator (OI)
except there are no stationary contacts, or the sta-
tionary contacts are moved upward out of reach of
the moving contacts.
The front spring in addition to holding the target, pro-
vides restraint for the armature and thus controls the
pickup value of the switch.
3.0
CHARACTERISTICS
The low pickup CV-8 Overvoltage Relay is available
with the following continuous voltage ratings.
The minimum 60 Hertz voltage to just close the CV-8
contacts is typically 8% of the continuous voltage.
Typical operating times of the type CV-8 relay are
shown on Figure 11 (page 13). An adjustable 5.4 to
20 volt relay with a 67 volt continuous and a 16 to 40
volt relay with a continuous of 199 volts is also avail-
able. However, the operate times for the adjustable
CV-8 relay will differ from Figure 11 and will depend
on the pickup setting. Figure 12 (page 14) applies
when the resistor is set for maximum pickup. Pickup
changes with frequency as shown in Figure 13 (page
15).
The CV-1 and CV-2 Undervoltage Relays, CV-4 and
CV-5 Overvoltage Relays, and CV-6 and CV-7 Over
or Under voltage Relays are available in the following
voltage ranges.
3.1.
CV-1 AND CV-2 UNDERVOLTAGE RELAYS
CV-4 AND CV-5 OVERVOLTAGE RELAYS
Tap value voltage is the minimum voltage required to
just close the relay contacts. At this value of voltage,
the moving contacts will leave the backstop of the
time dial and move to close the front contacts. Nor-
mal operation of the two relays is such that the CV-1
and CV-2 undervoltage relay will open its contacts
with application of voltages greater than tap value
voltage, while the CV-4 and CV-5 overvoltage relay
closes its contacts with voltages greater than tap
value voltage. Thus, the operating curves of Figures
14 and 15 (page 16) of the undervoltage relays apply
when the voltage is originally higher than tap value
voltage and is suddenly reduced to a value shown on
the curves. The operating curves of Figures 16 and
17 (page 19) of the overvoltage relays apply when
the voltage is initially below tap value voltage and is
suddenly raised to a value shown on the curves.
3.2.
CV-6 AND CV-7 OVER OR
UNDERVOLTAGE RELAYS
Tap value voltage is the value of voltage at which the
stationary front contact closes. The stationary back
contact will close within 5% of this value.
When the relay is used as an overvoltage relay, the
moving contact is made with the stationary back con-
tact for values of applied voltage less than tap value
voltage. With application of voltages greater than tap
value voltage, the moving contact moves to close the
front contact in a time as shown by the right-hand
curves of either Figures 18 or 19 (page 20).
When the relay is used as an undervoltage relay, the
moving contact is made with the stationary front con-
tact for values of applied voltage greater than tap
value voltage. With the application of voltages less
than tap value voltage, the moving contact moves to
close the back contact in a time as shown on the left-
hand curves of either Figures 18 or 19 (page 20).
3.2.1.
Auxiliary Relays (T)
Power Requirements
Per Unit:
1.3 watts at 48 volts dc
3.3 watts at 125 volts dc
Operate Time
Pick Up:
3 to 6 milliseconds
Drop Out:
90 to 130 milliseconds
Contact Rating:
A. 20 amperes
noninterrupting for less than
200 milliseconds
B. 1.3 amperes resistive at
125Vdc
C. Will control MG-6, SG, or AR
relays at 125Vdc
Type Relay
2 Minute Rating
67 volts
199 volts
140 volts
300 volts
Range
Taps
55-140
110-280
55
110
64
128
70
140
82
164
93
186
105
210
120
240
140
280
41-201.4H
CV Voltage Relay Class 1E
4
3.2.2.
Trip Circuit
The main contacts will close 30 amperes at 250 volts
dc and the seal-in contacts of the indicating contactor
switch will carry this current long enough to trip a cir-
cuit breaker.
3.2.3.
Trip Circuit Constants
Indicating Contactor Switch Coil, or Indicator Coil.
3.3.
ENERGY REQUIREMENTS
The 60 Hz burdens of the CV-1, CV-2, CV-4, CV-5,
CV-6, CV-7 relays at rated voltage are as follows:
(For 50 Hz, multiply volt-amperes by 1.18, multiply
watts by 1.38.)
The 50 Hz and 60 Hz burdens of the CV-8 relays at
continuous voltage do not exceed the following:
4.0
SETTINGS
4.1.
CV UNIT
The setting of the CV unit can be defined either by tap
setting and time dial position or by tap setting and a spe-
cific time of operation at some percentage of tap value
voltage (e.g. on CV-4 120 tap setting, 2 time dial position
or 120 tap setting, 12 seconds at 140 percent of tap
value voltage).
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 nylon screw on the terminal plate holds the tap
plate in position when taps are being changed. To
use the position on the terminal plate in which the
nylon screw is used, remove the nylon screw and
place it in one of the unused holes. Then remove the
tap screw and insert it in the terminal plate hole.
4.2.
CV-8 SETTINGS
The CV-8 relay has no taps. Its minimum pickup of
approximately 8% of continuous voltage is set by
adjusting the restraint spring. For this setting, the
adjustable resistor, where used, should be shorted out.
Where the resistor is used, the pickup setting can be
adjusted from approximately 8% to 30% of the continu-
ous voltage rating. This setting is made by adjusting the
resistor. Note, however, that the CV-8 time curves
shown in Figure 11 (page 13) apply only when the
resistor is shorted out. Timing tests should be con-
ducted after the resistor is used to change the pickup.
This will verify proper coordination time for the desired
pickup setting. Figure 12 (page 14) shows operate time
when the resistor is set for maximum pickup.
4.3.
INSTANTANEOUS RECLOSING
The factory adjustment of the voltage unit contacts
provides a contact follow. Where circuit breaker reclos-
ing will be initiated immediately after a trip by the over
voltage 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.
Ampere Pickup
Ohms dc Resistance
0.2
1.0
2.0
8.5
0.37
0.10
Rated ∆
Voltage
Taps
120
Volt
Relay
240
Volt
Relay
Volt-
Amps
Power
Factor
Watts
120 or
240 Volts
55
64
70
82
93
105
120
140
110
128
140
164
186
210
240
280
10.0
7.0
5.8
4.0
3.1
2.4
1.8
1.3
.38
.35
.34
.33
.31
.29
.28
.26
3.8
2.5
2.0
1.3
1.0
.7
.5
.3
∆
These relays will continuously withstand either 110% of rated volt-
age or tap value voltage, whichever is higher.
Continuous
Voltage
Range
Setting
Applied
Voltage
VA
Power
Factor
Watts
67
5.4 to
20V
5.4
20
67
67
30
15
.342
10
199
16 to
40V
16
40
199
199
30
20
.342
10
The CV-8 short time (15 seconds) rating is 240V and
510V respectively for the 67 and 199V relays.
