ABB CVX Manual

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
2
Figure 1. CVX-1 Relay Front View, Out of Case
POTENTIOMETER (R3)
CIRCLE ADJUST
RESTRAINT
ELECTROMAGNET
TIME DIAL
Figure 2. CVX-1 Relay Rear View, Out of Case.
OPERATING
ELECTROMAGNET
TELEPHONE
RELAY (T2)
ADJUSTABLE
RESISTOR (R4)
BALANCE ADJUST
TELEPHONE
RELAY (T1)
VOLTAGE SENSING
TELEPHONE RELAYS
(V1 & V2)

41-682.11
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to avoid the possibility of pumping when closing into
a fault.
2.0 CONSTRUCTION AND OPERATION
The type CVX relay consists of an operating element
(rear) and a restraining element (front) mounted on a
common disc, a circle adjust potentiometer (R3), and
a balance adjust resistor (R4). The relay also has
telephone relays (T1 & T2) in the time delay circuit to
override any possible contact chatter during a seis-
mic event. See Figures 1 and 2.
The CVX-1 Relay in addition to the components
noted above, has two telephone type ac voltage
sensing relays (V1 & V2). See Figures 1 and 2.
2.1 OPERATING ELEMENT
The operating unit consists of an “E” type laminated
electromagnet with two main coils on the center leg,
a lag coil on the left leg, and a lag coil on the right
leg. A resistor is connected across the shading coil.
When the relay is energized with two voltages, a flux
is produced that is proportional to the sum of the
applied voltages. This flux divides and returns
through the outer legs of the electromagnet. The lag
coil on the left leg causes the flux in that leg to lag the
main pole flux. The out of phase fluxes thus pro-
duced in the disc gap causes a contact closing
torque. The resistor connected across the lag coil of
the electromagnet provides adjustment for different
operating circles of the relay.
2.2 RESTRAINING ELEMENT
The restraining element consists of an “E” type lami-
nated electromagnet with two main coils on its center
leg and a lag coil on its left leg. A flux proportional to
the difference of the applied voltages to the relay is
produced. This flux divides and returns through the
outer legs of the electromagnet. The lag coil causes
the flux through the leg to lag the main pole flux. The
out-of-phase fluxes thus produced in the disc gap
causes a contact opening torque.
2.3 TIME DELAY CIRCUIT
The time delay circuit consists of two dc telephone
type relays. This intentional time delay circuit applies
to the CVX(-1) contact opening only, and is designed
to override any possible contact chatter during a
seismic event.
2.4 AC TELEPHONE RELAYS (V1 & V2), CVX-1
ONLY
The telephone operating relay units are fast operat-
ing types energized by the application of an ac volt-
age. In these relays, an electromagnet energized by
ac voltage, attracts a right angle armature which
operates a set of contacts.
2.5 CVX OPERATION WITH EXTERNAL VOLT-
AGE RELAYS
The connections shown in Figure 6 using external
type SG voltages relays will provide the following
operation:
1. Close the breaker when the bus is live and the
line is dead, through the 59B make contact and
27L break contact
2. Close the breaker when the line is live and the
bus is dead, through the 59L make contact and
27B break contact.
3. Close the breaker when the line and bus are
both live and when their respective voltages are
approximately normal, equal in phase, and of
the same frequency, through the CVX contact.
It is recommended that the number of reclosures be
limited by using either a single or a multi-shot reclos-
ing relay in conjunction with the CVX and SG relays.
2.6 CVX-1 OPERATION
In the CVX-1, the internal V1 and V2 perform the
functions of external 59B and 27L relays respectively.
The connections shown in Figure 7 using the type
CVX-1 relay will provide the following operation:
1. Close the breaker when the bus is live and the
line is dead, through the V1 make contact and
V2 break contact.
2. Close the breaker when the line is alive and the
bus is dead, through the V2 make contact and
V1 break contact.
3. Close the breaker when the line and bus are
both live and their respective voltages are

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
4
approximately normal, equal, in phase, and of
the same frequency through the CVX -1 contact.
It is recommended that the number of reclosures be
limited by using either a single or a multi-shot reclos-
ing relay in conjunction with the CVX1 relay.
3.0 CHARACTERISTICS
The type CVX and CVX-1 relays can be adjusted for
operating circles from 40° to 60° as shown in Figure
8. The relay is typically calibrated for the 40° circle as
shipped from the factory. These circles apply when
one side has rated voltage. The relay operates if the
other voltages falls within the appropriate circle.
The operating time of the relay is shown in Figure 9.
These time curves are obtained from the #11 time
dial setting when the applied voltages are equal to
rated voltage, in phase and of the same frequency.
Shorter operating times can be obtained at different
time dial settings as shown in Figure 10.
Figure 11 shows the maximum slip frequency for
which operation of the CVX element can occur. The
maximum slip frequency is a function of the circle
and time dial settings. This characteristic is of inter-
est in estimating the worst case angular difference at
the instant of breaker closure, for cases where the
two systems are slipping slowly.
Figure 12 shows typical CVX reset times for 20°, 40°
and 60° circle settings. Note: Class 1E Relays
should be set at 40° or higher.
3.1 BURDEN
The burden imposed on each potential source by the
CVX relay, with rated voltage applied to both circuits
of the relay is as follows:
The burden of the CVX relay with rated voltage
applied to one circuit is as follows:
For the CVX-1 relay, additional burden of each tele-
phone relay at 120 Volts is as follows:
Volt Amperes ................................................ 10.62
Power Factor ..................................................... 0.64
4.0 RELAY SETTINGS
As shipped from the factory the relays are calibrated
for a 40 degree circle. Other operating circles from
40° to 60° can be obtained by adjusting the left hand
potentiometer (front view) in the relay. The procedure
is described under Circles Other than 40 Degrees, in
Section 7.7.
Set the time dial so that the relay will not operate
when the systems are swinging too fast. The #11
time dial is recommended when the 60° circle setting
is used. A setting of #4 time dial or higher is recom-
mended with the 40° circle. If a longer delay is
desired, a higher time dial setting may be used.
To evaluate the effect of time dial and circle settings
on the worst-case phase-angle difference between
the two systems at the instant of breaker closure,
refer to Figure 9. For example, assume a 40° circle
and #4 time dial setting. Also assume that the sys-
tems are slipping at a frequency of 0.048 hertz, Fig-
ure 11 shows the maximum slip for which the relay
will operate. This means that the relay contacts
closed just as the one voltage vector moves out of
the circle.
This would mean that the system would be 40°
out-of-phase at the instant that the breaker close cir-
cuit is energized. The phase angle at the instant of
breaker closure is:
φ= 40° + 0.048 x 360TB= 40° + 17.3TB
where TB= breaker closing time in seconds.
60 Hertz 50 Hertz
Volt Amperes 15.4 23.3
Power factor 0.422 0.309
Watts 6.5 7.2
60 Hertz 50 Hertz
Volt Amperes 15.4 23.3
Power factor 0.422 0.309
Watts 6.5 7.2

41-682.11
5
Let TB= 0.5 Seconds
Then 40° + 17.3 x 0.5 = 48.6°
5.0 INSTALLATION
The relays should be mounted on switchboard pan-
els or their equivalent in a location free from dirt,
moisture, excessive vibration, and heat. Mount the
relay vertically by means of the four mounting holes
on the flanges for the semi-flush type FT case. The
mounting screws may be utilized for grounding the
relay. External toothed washers are provided for use
in the locations shown on the outline and drilling plan
to facilitate making a good electrical connection
between the relay case, its mounting screws and the
relay panel. Ground Wires should be affixed to the
mounting screws as required for poorly grounded or
insulating panels. Other electrical connections may
be made directly to the terminals by means of screws
for steel panel mounting.
For detail information on the FT case refer to Instruc-
tion leaflet 41-076 for semi-flush mounting.
6.0 ADJUSTMENTS AND MAINTE-
NANCE
NOTE: The proper adjustments to insure correct
operation of this relay have been made at the fac-
tory. Upon receipt of the relay, no customer
adjustments, other than those covered under
“Settings” should be required.
6.1 ACCEPTANCE CHECK
The following check is recommended to insure that
the relay is in proper working order:
6.1.1 Disk Unit Contacts (Time Dial)
The index mark on the movement frame will coincide
with the “0” mark on the time dial when the stationary
contact has been 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 0.020". The placement of the various
time dial positions in line with the index mark will give
operating times as shown on the time curve.
6.1.2 Operating Circle
Connect the CVX relay per the test diagram, Figure
15. CVX-1 relays should be connected in a similar
manner to correspond with the wiring of the particular
style CVX-1 using Figure 16. The contacts should
just close under the following condition:
When V1and V2are equal to rated voltage and their
phase difference is between 38° and 42° (either lead-
ing or lagging), verify that the contacts should just
open within the make angle plus approximately 4°.
6.1.3 Time Curve
With the time dial set at position 11, the contact
should close in 6 ±1 seconds when V1and V2, equal
to rated voltage at zero phase angle, are applied.
6.1.4 Time Delay Circuit (T1, T2)
With test connections made according to Figures 15
and 16, open the D.P.S.T. swtich. The timer start
should be set on contacts (make) and the timer stop
should be on volts (fall). The drop out time of T1 &
T2 should be between 300 to 450 msec.
6.1.5 Telephone Relays (V1 & V2), CVX-1 Only
Apply ac voltage to each telephone relay circuit. The
telephone relay should pickup when 95 volts ac is
applied.
6.2 ROUTINE MAINTENANCE
All relays should be inspected periodically and the
time of operation should be checked at least once
every two years or at such other time intervals as
may be dictated by experience to be suitable to the
particular application.
All contacts should be periodically cleaned. A contact
burnisher Style #182A836H01 is recommended for
this purpose. The use of abrasive materials for clean-
ing contacts is not recommended, because of the
danger of embedding small particles in the face of
the soft silver contact and thus impairing the contact.
7.0 CALIBRATION
Use the following procedure for calibrating the relay if
the relay has been taken apart, received repairs, or

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
6
the adjustments have been disturbed. This proce-
dure should not be used until it is apparent that the
relay is not in the proper working order (See Accep-
tance Check).
7.1 CONTACTS
For Disc Unit Contacts see section 6.1.1
7.2 PRELIMINARY ADJUSTMENTS
Remove the permanent magnet from the relay and
set the time dial on the #11 position. Next unwind the
spring for zero tension on the #11 position. This can
best be noticed by unwinding the spring until the con-
tact will not move when the time dial is moved a small
distance beyond the #11 position.
The spring convolutions may touch during this opera-
tion and the outer convolutions may hit other sur-
faces of the relay. This interference should be
disregarded because its effect on the final calibration
will be negligible. The reason for unwinding the
spring is that the amount of tension on the reset
spring affects the diameter of the circle. Hence the
spring tension has to be removed initially so that only
the left hand potentiometer (R3) will affect the oper-
ating circle.
7.3 SPURIOUS TORQUE ADJUSTMENTS
a) With the relay set as per the preliminary adjust-
ments, open both lag coil circuits of the rear elec-
tromagnet This can be done by opening the
screw connection on both the lag coils of the rear
electromagnet.
b) Connect the relay to test circuit of Figure 15 for
CVX, or Figure 16 for CVX-1, and then apply
rated voltage at zero phase angle on both cir-
cuits. All voltage settings are to be within 1/4
Volts.
7.4 CENTERING CIRCLE
a) De-energize the relay and close the left lag coil
circuit front view of the rear electromagnet and
set the left hand potentiometer (R3) at approxi-
mately one-third of its resistance.
b) Adjust the phase shifter on the lagging direction
until the contacts just close with V1and V2equal
to rated voltage. Note the angle at which the con-
tacts just close.
c) Adjust the phase shifter in the leading direction
until the contacts just close with V1and V2equal
to rated voltage. If the latter angle is not within ±1
degree of the former angle, adjust R4, the top
right hand resistor (rear view) until the two
angles are within ±1 degree of each other.
7.5 SPRING ADJUSTMENT
a) Adjust R3, the left potentiometer (front view)
such that the moving contact just leaves and
returns to the backstop of the time dial at the #11
position between 30° and 31° for CVX and
between 35° and 36° for CVX-1 with rated volt-
age on both sides (leading or lagging: increasing
the resistor decreases the angle).
b) Change the angle to 40° and adjust the reset
spring until the contacts just make.
c) Rotate the phase shifter to move V2through zero
phase angle where the contacts just make. The
contacts should just close at an angle of 40° ± 2°
with V1and V2equal to rated voltage.
d) With V1equal to rated voltage, the contacts
should just close when V2is increased to 60V
±2.5V in phase with V1. If necessary, readjust
spring slightly to obtain this condition. The relay
is now calibrated for a 40° circle. Spring convolu-
tions must not touch after this adjustment.
e) Reconnect the right lag coil of the rear electro-
magnet and adjust R3, the left hand potentiome-
ter (front view) to achieve the 40° degree circle
(where the contacts just close at an angle of 40°
± 2°).
7.6 TIME CURVE
Install the permanent magnet on the relay. Adjust the
permanent magnet keeper until the operating time of
the relay from the #11 time dial position is ±6 sec-
onds with V1and V2equal to rated voltage at zero
phase angle.
7.7 CIRCLES OTHER THAN 40 DEGREES
This adjustment should not be done until the above
adjustments for a 40° circle has been completed.
If another circle other than 40° is desired, adjust R3,
the left hand potentiometer (front view) to obtain the
desired circle. For example, if a 50 degree circle is

41-682.11
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desired, adjust R3 until the contacts just close with
V1and V2equal to rated voltage at 50° phase angle.
It may be necessary to readjust R4, the right hand
resistor (rear view) to position the desired circle sym-
metrically about the zero degree line. See “Centering
Circle” (section 6.4) for procedure. The time for the
operation will be as shown in the time curves of Fig-
ure 10.
8.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
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LIST OF FIGURES
Figure 1 CVX-1 Relay Front View, Out of Case ...............................................................................Pg.2
Figure 2 CVX-1 Relay Rear View, Out of Case ................................................................................Pg.2
Figure 3 Internal Schematic Type CVX Synchro-Verifier Relay with Isolated Potential
Circuits, in Type FT-21Case - 9676A63 ............................................................................Pg.9
Figure 4 Internal Schematic Type CVX-1 Synchro-Verifier with HBDL/HLDB Outputs
Isolated from CVX-1 Contact. Common Potential Circuits, in Type FT-21
Case - 9676A30 ..............................................................................................................Pg.10
Figure 5 External Schematic of Type CVX Synchro-Verifier Relay,
in type FT-21 Case - 9676A69 ........................................................................................Pg.11
Figure 6 External Schematic of Type CVX Synchro-Verifier Relay,
in type FT-21 Case, with External Voltage Relays - 9676A78 .........................................Pg.11
Figure 7 External Schematic of the Type CVX-1 Synchro-Verifier Relay,
in Type FT-21 Case - 9676A70 .......................................................................................Pg.12
Figure 8 Curve, Typical Voltage Angle characteristics - 184A997 .................................................Pg.12
Figure 9 Curve, Typical Time Phase Angle Curves - 184A998 .....................................................Pg.13
Figure 10 Curve, Operating Time Variations - 184A999 .................................................................Pg.14
Figure 11 Curve, Maximim Slip Frequency Cuves - 185A123 .........................................................Pg.15
Figure 12 Curve, Typical Reset TImes - 619595 .............................................................................Pg.16
Figure 13 Curve, V1Voltage for Different Operating Circles - 471191 .............................................Pg.17
Figure 14 Curve, Operating Times from #11 Time Dial Setting - 471192 .......................................Pg.17
Figure 15 Test Diagram for CVX Relay - 1507B43 ..........................................................................Pg.18
Figure 16 Test Diagram Type CVX-1 Relay - 1507B44 ...................................................................Pg.19
Figure 17 Outline and Drilling Plan for FT-21 Case - 3519A66 ......................................................Pg.20

41-682.11
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Sub 1
9676A63
Figure 3. Internal Schematic CVX Synchro-Verifier Relay with Isolated Potential Circuits.

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
10
Sub 1
9676A30
Figure 4. Internal Schematic Type CVX-1 Synchro-Verifier Relay in Type FT-21 Case with
HBDL/HLDB Outputs Isolated from CVX-1 Contact, and with Common Potential Circuits.

41-682.11
11
Figure 5. External Schematic of Type CVX Synchro-Verifier Relay with Isolated Potential Circuits.
Sub 1
9676A69
Figure 6. External Schematic of Type CVX Synchro-Verifier Relay with Isolated Potential Circuits and External
Sub 1
9676A78
Voltage Relays.

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
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Sub 1
9676A70
Figure 7. External Schematic of Type CVX-1 Synchro-Verifier with
HBDL/HLDB Outputs Isolated from
CVX-1 Contact, and with Common Potential Circuits.
184A997
Sub 1
Figure 8. Typical Voltage-Angle Characteristic of CVX and CVX-1 for Various Closing Angle Settings,
Rated Voltage on One Circuit.

41-682.11
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Sub1
184A998
Figure 9. Typical Time Phase Angle Curves of CVX and CVX-1 Relays. Rated Voltage on Both Circuits.
Number 11 Time Dial Setting.

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
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Sub 2
184A999
Figure 10. Operating Time Variations with Changes in Time Dial Settings. Rated In-Phase Voltage on Both Circuits,
20, 40, and 60 degree Circle.

41-682.11
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Figure 11. Approximate Maximum Slip Frequency for which Operation Occurs. Rated Voltage Both Sides.
Sub 1
185A123

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
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Figure12. Typical CVX, CVX-1 Reset Times. Return of Contact to Backstop Position with one Voltage at Rated
TYPICAL CVX RESET TIME
Voltage and the Other Suddenly Reduced from Rated in Phase to Zero Voltage.
Sub 1
185A123

41-682.11
17
Figure13. V1Voltage for Different Operating Circles,
V2is Equal to Rated Voltage at Zero Phase Angle.
Figure14. Operating Times from the #11 Time
Dial Position, set for Different Operating Circles.
V1and V2areEqual to Rated Voltage at Zero
Phase Angle.
Sub 1
471191
Sub 1
471192

I.L. 41-682.11 Type CVX and CVX-1 Synchro-Verifier Relays
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+
-
Figure 15. Test Diagram for CVX Synchro- Verifier Relay with Isolated Potential Circuits
Sub 1 1507B43

41-682.11
19
Figure 16. Test Diagram for Relay Type CVX-1 Synchro-Verifier with Common Potential Circuits.
Sub 1 1507B44