Powell PowlVac 1200 User manual

01.4IB.50026A PowlVac®Electrically
Operated Ground and Test Device
5kV & 15kV, up to 50kA
per ConEd Specification EO-2022-15
for ConEd CUSTOMER
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01.4IB.50026A
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
Contact Information
Powell Electrical Systems, Inc.
www.powellind.com
[e-mail]
Service Division
PO Box 12818
Houston, Texas 77217-2818
Tel: [phone]
Fax: [phone]

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01.4IB.50026A
Signal Words
As stated in ANSI Z535.4-2007, the signal word is
a word that calls attention to the safety sign and
designates a degree or level of hazard seriousness.
The signal words for product safety signs are
“Danger”, “Warning”, “Caution” and “Notice”.
These words are defined as:
DANGER indicates an imminently hazardous
situation which, if not avoided, will result in
death or serious injury.
!
DANGER
!
WARNING
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
!
CAUTION
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
CAUTION, used without the safety alert
symbol, is used to address practices not
related to personal injury.
CAUTION
NOTICE
NOTICE is used to address practices not related
to personal injury.
Qualified Person
For the purposes of this manual, a qualified
person, as stated in NFPA 70E®, is one who has
skills and knowledge related to the construction
and operation of the electrical equipment and
installations and has received safety training to
recognize and avoid the hazards involved. In
addition to the above qualifications, one must also
be:
1. trained and authorized to energize,
deenergize, clear, ground, and tag circuits
and equipment in accordance with
established safety practices.
2. trained in the proper care and use of
personal protective equipment (PPE)
such as rubber gloves, hard hat, safety
glasses or face shields, flash clothing, etc.,
in accordance with established safety
practices.
3. trained in rendering first aid if necessary.

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01.4IB.50026A
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
This page is intentionally left blank.

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01.4IB.50026A
Ch 1 General Information ................................................................................................1
A. Scope ...............................................................................................................................................................2
B. InStructIon BulletInS AvAIlABle electronIcAlly ....................................................................................................2
Ch 2 Safety .......................................................................................................................3
A. SAfe Work condItIon .........................................................................................................................................3
B. SAfety GuIdelIneS ...............................................................................................................................................3
c. GenerAl ............................................................................................................................................................4
d. SpecIfIc .............................................................................................................................................................4
e. SAfety lABelS ....................................................................................................................................................5
Ch 3 Equipment Description ............................................................................................6
A. GenerAl ............................................................................................................................................................6
B. rAtInG ..............................................................................................................................................................6
c. prImAry dISconnect StABS ..................................................................................................................................6
d. Ground mAkInG SWItch ......................................................................................................................................6
e. Stored enerGy mechAnISm ..................................................................................................................................7
f. teSt portS ..................................................................................................................................................... 15
G. leverInG-IndevIce .......................................................................................................................................... 15
h. InterlockInG ................................................................................................................................................... 16
I. ShutterS ........................................................................................................................................................ 16
J. operAtInG coIlS .............................................................................................................................................. 16
1) Closing Coil .............................................................................................................................................................................16
2) Shunt Trip Coil ........................................................................................................................................................................16
k. control relAy ............................................................................................................................................... 17
l. trIp pAddle Interlock SWItch ........................................................................................................................... 17
m. remote control Box ...................................................................................................................................... 17
n. key lockS ...................................................................................................................................................... 17
1) Key Lock “K1” (Keys KCF and KB) ........................................................................................................................................17
2) Key Lock “K2” (Keys KB and KC) ..........................................................................................................................................19
3) Key Lock “K3” (Key KC) ..........................................................................................................................................................19
4) Key Lock “K4” (Keys KB and KD) ..........................................................................................................................................19
5) Key Lock “K5” (Key KD) ..........................................................................................................................................................20
o. control Selector SWItch ................................................................................................................................ 20
p. pAdlockABle cover ......................................................................................................................................... 20
Q. InterchAnGeABIlIty .......................................................................................................................................... 20
Contents

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ii
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
Ch 4 Installation .............................................................................................................21
A. receIvInG ........................................................................................................................................................ 21
B. hAndlInG ....................................................................................................................................................... 21
c. StorAGe ......................................................................................................................................................... 21
d. electrIcAl operAtIon check ............................................................................................................................. 22
1) Test the Closing Operation of the Ground and Test Device .........................................................................................22
2) Test the Opening Operation of the Ground and Test Device ......................................................................................23
e. InSertInG Ground And teSt devIce Into SWItchGeAr eQuIpment ............................................................................ 23
1) Inserting Ground & Test Device Into Upper Compartment .........................................................................................23
2) Racking Ground & Test Device to the Connected Position ..........................................................................................23
3) Moving the Ground and Test Device from the Connected Position to the Disconnected Position ....................24
4) Removing the Ground and Test Device from the Upper Switchgear Compartment .............................................24
Ch 5 Operating Procedures ............................................................................................25
A. ApplyInG Ground ............................................................................................................................................ 25
B. removInG Ground .......................................................................................................................................... 28
c. procedure for teStInG feeder .......................................................................................................................... 29
d. teStInG portS ................................................................................................................................................. 31
e. removInG teSt proBeS ..................................................................................................................................... 31
Ch 6 Maintenance ..........................................................................................................34
A. GenerAl deScrIptIon ....................................................................................................................................... 34
1) Introduction ............................................................................................................................................................................34
2) Inspection and Cleaning ......................................................................................................................................................34
B. mechAnISm AreA ............................................................................................................................................. 35
1) Mechanical Operation .........................................................................................................................................................35
2) Lubrication .............................................................................................................................................................................35
3) Mechanism Adjustments .....................................................................................................................................................38
4) Electrical Operation ..............................................................................................................................................................39
c. GroundInG SWItch AreA .................................................................................................................................. 39
1) Routine Maintenance ...........................................................................................................................................................39
2) Moving Contact Adjustments .............................................................................................................................................39
d. hIGh potentIAl teStS ....................................................................................................................................... 40
1) High Voltage Insulation Integrity ......................................................................................................................................40
2) Control Voltage Insulation Integrity .................................................................................................................................41
Contents

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01.4IB.50026A
Ch 7 Recommended Renewal Parts and Replacement Procedures ..............................42
A. orderInG InStructIonS ..................................................................................................................................... 42
B. recommended reneWAl pArtS .......................................................................................................................... 42
c. replAcement procedureS ................................................................................................................................. 43
1) Grounding Switch Movable Contact ................................................................................................................................43
2) Grounding Switch Stationary Contacts ...........................................................................................................................43
3) Closing Coil Assembly ...........................................................................................................................................................44
4) Charging Motor Assembly ..................................................................................................................................................44
5) Shunt Trip Coil ........................................................................................................................................................................45
6) Control Relay ..........................................................................................................................................................................45
7) Latch Check Switch ...............................................................................................................................................................46
8) Trip Paddle Interlock Switch ................................................................................................................................................46
9) Motor Cutoff Switch Assembly ...........................................................................................................................................47
10) Auxiliary Switch .....................................................................................................................................................................47
11) Primary Contact Spring Assembly .....................................................................................................................................48
12) Ground Shoe Finger Assembly ...........................................................................................................................................48
Contents

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iv
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
Figure 1 Ground & Test Device with Probes .................................................................8
Figure 2a Ground & Test Device Right View with Lower Primaries ...............................9
Figure 2b Ground & Test Device Right View with Upper Primaries ...............................9
Figure 3 Mechanism - Top View ..................................................................................11
Figure 4 Mechanism - Left View .................................................................................12
Figure 5 Mechanism and Trip Linkages .....................................................................13
Figure 6 Cam and Fundamental Link Positions .........................................................14
Figure 7 Test Ports ......................................................................................................15
Figure 8 Remote Control Box .....................................................................................17
Figure 9 Control Scheme ............................................................................................18
Figure 10 Ground & Test Device in Shipping Carton ...................................................21
Figure 11 Inserting KCF Key into Key Lock K1 ..............................................................25
Figure 12 Key KB into Key Lock K2 and Depressing Manual Trip Push Button ...........26
Figure 13 Inserting Key KC into Key Lock K3 ................................................................26
Figure 14 Transfer Key KC to Key Lock K2 ....................................................................26
Figure 15 Transfer Key KB to Key Lock K1 ....................................................................27
Figure 16 Selector Switch in Off Position .....................................................................27
Figure 17 Connecting Control Box to Device ...............................................................27
Figure 18 Selector Switch in Closed Position ...............................................................27
Figure 19 Press Close on Control Box ...........................................................................28
Figure 20 Inserting Key KB into Key Lock K1 ................................................................28
Figure 21 Key KCF is Released from Key Lock K1 .........................................................28
Figure 22 Press Open on Control Box ..........................................................................28
Figure 23 Key KD in Key Lock K5 with Shutters Unlocked ............................................30
Figure 24 Test Probes Installed ....................................................................................30
Figure 25 Mechanism for Lubrication Call Outs ..........................................................37
Figure 26 Mechanism Detail - Right Side .....................................................................38
Figure 27 Ground Switch Contacts ..............................................................................40
Tables
Table A Lubrication .........................................................................................................36
Table B Recommended Renewal Parts ............................................................................42
Figures

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General Information
01.4IB.50026A
!
WARNING
The equipment described in this document may contain high voltages and currents which can
cause serious injury or death.
The equipment is designed for use, installation, and maintenance by knowledgeable users of such
equipment having experience and training in the field of high voltage electricity. This document
and all other documentation shall be fully read, understood, and all warnings and cautions
shall be abided by. If there are any discrepancies or questions, the user shall contact Powell
immediately at 1.800.480.7273.
!
WARNING
Before any adjustment, servicing, part replacement, or any other act is performed requiring
physical contact with the electrical working components or wiring of this equipment, the power
supply must be disconnected. Failure to follow this warning may result in injury or death.
NOTICE
The information in this instruction bulletin is not intended to explain all details or variations of the
Powell equipment, nor to provide for every possible contingency or hazard to be met in connection
with installation, testing, operation, and maintenance of the equipment. For additional
information and instructions for particular problems, which are not presented sufficiently for the
user’s purposes, contact Powell at 1.800.480.7273.
Powell reserves the right to discontinue and to change specifications at any time without incurring
any obligation to incorporate new features in products previously sold.
NOTICE
Ch 1 General Information

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2General Information
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
A. Scope
The information in this instruction bulletin
describes the following PowlVac®Electrically
Operated 15kV Ground & Test Device:
• PV-E 60600G98 - 1200, 2000, & 3000A
• PV-E 60600G99 - 1200, 2000, & 3000A
The information in this instruction bulletin is
intended to provide information required to
properly operate and maintain the
PowlVac Ground & Test Device described in
Ch 1 General Information, A. Scope.
This instruction bulletin provides:
1. Safety guidelines
2. General descriptions of the operation and
maintenance of the ground & test device
3. Instructions for installation and placing the
ground & test device into service
4. Instructions for part replacement
5. Information for ordering renewal parts
6. Illustrations, photographs, and description
of the ground and test device
The illustrations contained in this document
may not represent the exact construction
details of each particular type of ground and
test device. The illustrations in this document
are provided as general information to aid in
showing component locations only.
All illustrations are shown using deenergized
equipment.
Be sure to follow the appropriate safety
precaution while handling any of the
equipment. Failure to do so may result in
serious injury or death.
!
WARNING
To the extent required, the products described
herein meet the applicable ANSI, IEEE, and
NEMA Standards; however, no such assurance
is given with respect to local codes and
ordinances which may vary greatly.
B. InStructIon BulletInS AvAIlABle electronIcAlly
For more information visit www.powellind.com.
To contact the Powell Service Division call
1.800.480.7273 or 713.944.6900, or email
[e-mail].

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Safety
01.4IB.50026A
Ch 2 Safety
A. SAfe Work condItIon
The information in Section A is quoted from
NFPA 70E 2012 - Article 120, 120.1 Establishing an
Electrically Safe Work Condition.
120.1 Process of Achieving an Electrically Safe
Work Condition
1. Determine all possible sources of electrical
supply to the specific equipment. Check
applicable up-to-date drawings, diagrams,
and identification tags.
2. After properly interrupting the load current,
OPEN the disconnecting device(s) for each
source.
3. Wherever possible, visually verify that all
blades of the disconnecting devices are
fully OPEN or that drawout type circuit
breakers are withdrawn to the fully
disconnected position.
4. Apply lockout/tagout devices in accordance
with a documented and established policy.
5. Use an adequately rated voltage detector
to test each phase conductor or circuit part
to verify they are deenergized. Test each
phase conductor or circuit part both
phase-to-phase, and phase-to-ground.
Before and after each test, determine
that the voltage detector is operating
satisfactorily.
Informational Note: See ANSI/ISA-61010-1
(82.02.01)/UL 61010-1, Safety Requirements
for Electrical Equipment for Measurement,
Control, and Laboratory Use - Part 1: General
Requirements, for rating and design
requirements for voltage measurement
and test instruments intended for use on
electrical systems 1000 V and below.
6. Where the possibility of induced voltages
or stored electrical energy exists, ground
the phase conductors or circuit parts
before touching them. Where it could be
reasonably anticipated that the conductors
or circuit parts being deenergized
could contact other exposed energized
conductors or circuit parts, apply ground
connecting devices rated for the available
fault duty.
B. SAfety GuIdelIneS
Study this instruction bulletin and all other
associated documentation before uncrating
the ground and test device.
Each user has the responsibility to instruct
and supervise all personnel associated with
usage, installation, operation, and maintenance
of this equipment on all safety procedures.
Furthermore, each user has the responsibility of
establishing a safety program for each type of
equipment encountered.
The ground and test devices described in this
instruction bulletin are operated by a
high-energy, high-speed mechanism that
is interlocked to provide specific operating
sequences. It is mandatory that the following
rules be observed to ensure the safety of
personnel associated with usage, installation,
operation, and maintenance of these ground
and test devices.
The safety rules in this instruction bulletin are
not intended to be a complete safety program.
The rules are intended to cover only some of the
important aspects of personnel safety related to
PowlVac® Electrically Operated Ground and Test
Device.

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4Safety
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
c. GenerAl
1. Only supervised and qualified personnel
trained in the usage, installation, operation,
and maintenance of the ground and test
device shall be allowed to work on this
equipment. It is mandatory that this
instruction bulletin, any supplements, and
service advisories be studied, understood,
and followed.
2. Maintenance programs must be consistent
with both customer experience and
manufacturer’s recommendations,
including service advisories and instruction
bulletin(s). A well planned and executed
routine maintenance program is essential
for ground and test devices’reliability and
safety.
3. Service conditions and ground and test
device applications shall also be considered
in the development of safety programs.
Variables include ambient temperature;
humidity; number of operations; and any
adverse local conditions including excessive
dust, ash, corrosive atmosphere, vermin
and insect infestations.
d. SpecIfIc
When operating the ground and test device
safety precaution must be observed. Improper
use can result in death, serious personal
injury, or damage to the equipment. It is
important for the user to develop specific and
safe operating procedures to be observed
when using the ground and test device.
The following specific safety precautions must
be observed:
1. Do not close the grounding switch on
an energized circuit. The circuit to be
grounded should always be treated as
energized until proven otherwise.
2. Use great care when opening the test
port shutters to gain access to the test
receptacles. The test receptacles should
always be treated as energized circuits until
proven otherwise.
3. Any test device plugged into the test
receptacles must be properly rated for
the circuit voltage being tested and all
connections must be properly insulated.
4. Use only the test probes furnished with
the device to plug anything into the test
ports. Use of other plugs may damage the
test port or may result in a poor connection
which could be dangerous to the operator
and/or damaging to the equipment.
5. Even though insulated, the test probes
must not be inserted or extracted from
energized test ports. The test probe
insulation is only one part of a complete
line-to-ground insulation system and the
surface of the test probe may be energized
at a voltage above ground potential when
connection to an energized test port.
6. Do not attempt to force or bypass any
interlocks. The interlocks are furnished
for the safety of the operator and the
protection of the equipment being tested
and the test device. Forcing or bypassing
the interlocks can result in a condition
dangerous to the operator and/or
damaging to the equipment.
7. Do not attempt to service the device while
it is installed in a switchgear compartment
or on a lift truck. For service, the device
must be located either on the floor or on a
sturdy, level work bench, and blocked from
rolling.

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Safety
01.4IB.50026A
8. For service, the device must be in the OPEN
position and all operating springs must
be discharged. These conditions should
be verified before removing any covers or
attempting any service.
9. Store the electrically operated ground and
test device in a clean, dry area free from
dust, dirt, moisture, caustic atmosphere,
and vermin.
10. Keep all insulating surfaces, which include
primary support insulation and insulation
barriers, clean and dry.
11. Check all primary circuit connections to
make certain that they are clean and tight.
12. Take extreme care while using this device to
avoid contacting “live”or “hot”(energized)
terminals.
e. SAfety lABelS
The equipment described in this document
has DANGER, WARNING, CAUTION, and
instruction labels attached to various locations.
All equipment DANGER, WARNING, CAUTION,
and instruction labels shall be observed
when the ground and test device is handled,
operated, or maintained.
Warning and Caution labels are located
in various places in and on the switchgear
and on the ground and test device. Always
observe these warnings and caution labels.
Do NOT remove or deface any of these
warning/caution labels.
NOTICE

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6Equipment Description
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
Ch 3 Equipment Description
A. GenerAl
The PowlVac® Electrically Operated Ground &
Test Device is a drawout element that can be
inserted into the circuit breaker compartment
in the same manner as a PowlVac circuit
breaker.
The PowlVac Electrically Operated Ground &
Test Device provides a means for obtaining
access to the primary disconnecting devices of
the switchgear compartment for purposes of
grounding the primary circuits or conducting
certain high voltage test procedures such as
conducting high voltage withstand (hipot)
tests.
The grounding switch is operated by a stored
energy mechanism. It is capable of applying
the ground against a live circuit if operational
errors have not cleared the circuit. However, in
such a case, the relaying at the source of power
is expected to cause the source interrupter to
clear the circuit.
B. rAtInG
The ground and test device has ratings similar
to a power circuit breaker, with two very
important exceptions: it has no continuous
current rating, and it has no interrupting
rating. This device has no continuous current
rating because it cannot be used to carry a
continuous current. It has no interrupting
rating (or any of the ratings associated with the
interrupting rating, such as interrupting time,
etc.) because it is not designed to interrupt
current.
In general, the ratings applied to any ground
and test device are the same as those applied
to the power circuit breaker it is designed to
temporarily replace for grounding and testing
purposes. The rating nameplate (Figure 1, i)
on the front of the device will give the ratings
applicable to any individual device.
c. prImAry dISconnect StABS
The ground and test device has three (3)
primary disconnect stabs consisting of
an upper or lower device (Figure 2a, f &
Figure 2b, a) similar in design to those on
the PowlVac circuit breaker. These three
disconnects will connect the three stationary
primary disconnect stabs in the switchgear
compartment when the ground and test device
is racked into the connected position. They
are mounted on the rear of a heavy insulated
barrier near the rear of the ground and test
device.
d. Ground mAkInG SWItch
A three-pole, single-throw ground making
switch is mounted on the front of the insulating
barrier on which the selector switch hinges are
mounted. The three stationary contacts of the
grounding switch (Figure 3, a) are connected to
the three primary disconnect stabs so that the
ground making switch can be connected to the
primary disconnect stabs, allowing the selected
circuit of the switchgear compartment to be
grounded.
The moving contacts and blades of the ground
making switch (Figure 3, b) are operated by
a high-speed stored energy mechanism. The
ground making switch contact structure is
specially designed for the close-and-latch
and short-time current carrying duties to
which it can be subjected. These contacts
are not designed for continuous current
carrying duty or for interrupting duty. The
position of the ground making contacts can be
observed when the device is in the switchgear
compartment through transparent viewing
panels (Figure 1, f) in front of the contacts.

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Equipment Description
01.4IB.50026A
The hinges of the three grounding contacts are
connected together by a ground bus
(Figure 3, d), which is in turn connected to a
heavy duty ground connection located on
the rear of the ground and test device frame
between the center and right phases. This
ground connection duplicates the ground
connection on the PowlVac®circuit breaker and
connects to the ground bus in the switchgear
compartment, providing a path to ground from
the ground making switch.
e. Stored enerGy mechAnISm
The lower front cover has cutouts and
apertures giving access to various operating
and levering-in mechanism indicating and
operating functions. Removal of the holding
screws allows the removal of the upper portion
of the front cover and the test port shutter
assembly, giving access to the mechanism
and its interlocks (Figure 3), auxiliary switches
(Figure 3, c), charging motor (Figure 4, a), and
motor cutoff switch (Figure 4, c).
The ground making switch is closed and
opened by a stored energy mechanism
(Figure 3) in which a gear motor is used to
compress a closing spring. During a closing
operation, the energy stored in the spring
is used to close the ground making switch
contacts, charge the opening springs and
overcome friction forces. When the ground
making switch is opened, the energy stored
in the opening spring and the kickoff springs
will open the contacts. Since the ground
making switch has no interrupting rating,
contact speed while opening is not important.
The motor, located on the inside of the lower
front cover at the left (Figure 4, a) is supported
from the lower front cover. Its output shaft
is screwed to a coupler which insert into the
eccentric drive shaft. This shaft is supported
in the needle bearings in the mechanism
frame side sheets and transmits the motor
torque from the left to the right side of the
mechanism.
When the motor is energized, the eccentric
shaft rotates and causes the driving arm links
to pivot about the cam shaft (Figure 3, l). The
drive pawl located on the links engages with
the ratchet wheel and rotates it. The ratchet
wheel is prevented from rotating backwards
by a holding pawl, which is supported on links
which project upwards from the cam shaft.
To ensure correct synchronization of the drive
and hold pawls, the hold pawl links are located
by a threaded shaft which passes through
the lower front cover to the right of the
mechanism. The position of the holding pawls
is adjusted by a nut on the outer end of this
shaft.
As the ratchet wheel is rotated, projections
from its side faces will engage drive plates
attached to the cam shaft and the cam shaft
will rotate. Attached to the ends of the cam
shaft are crank arms and pointing outward
from these are crank pins. These engage with
the front ends of the connecting rods
(Figure 4, d), the rear ends of which engage in
pins projecting from the spring compression
plate which straddles the main closing spring.
As the cam shaft rotates, the connecting rods
pull the spring compression plate forward,
compressing the closing spring.
The ratchet wheel will drive the cam shaft so
that the connecting rods go forward as far as
possible and then start to move to the rear. At
a certain point, the spring force will overcome
friction and resistance and start to rotate the
cam shaft. At the same time, the pawls are
uncoupled from the ratchet wheel and the
motor cutoff switch is operated.

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8Equipment Description
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
Figure 1 Ground & Test Device with Probes
a. Test Probes (shown with test leads attached)
b. Key Lock K5
c. Racking Assembly
d. Levering In Shutter
e. Key Lock K3
f. View Window
g. Power Receptacle
h. Control Selector Switch
i. Nameplate
j. Key Lock K4
k. Key Lock K1
l. Key Lock K2
m. Close Coil
n. Manual Push to Trip Paddle
a
b
c
d
e
f
g
h
i
j
k
l
m
n

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Equipment Description
01.4IB.50026A
Figure 2a Ground & Test Device Right View with Lower Primaries
a. Crank Arm Roller
b. Racking Gear
c. Racking Crank Arm
d. Worm Gear
e. Levering-In Shutter Interlock
f. Lower Primary
Disconnecting Device
g. Ground Connection
h. Anti-Rollout Latch
i. Wheel
a
bc
d
e
f
g
i
h
Figure 2b Ground & Test Device Right View with Upper Primaries
a
c
d
e
f
g
i
h
b
a. Upper Primary
Disconnecting Device
b. Crank Arm Roller
c. Racking Gear
d. Racking Crank Arm
e. Worm Gear
f. Levering-In Shutter Interlock
g. Ground Connection
h. Anti-Rollout Latch
i. Wheel

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10 Equipment Description
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
When the close latch is released by the closing
solenoid, the closing spring pulls the cam shaft
around and the main closing cam moves the
main linkage into the closed position. The
main linkage rotates the drive levers of the jack
shaft, which is supported by the mechanism
side sheets, where it is clamped by hook plates
and by the ground and test device side panels.
The jack shaft has three (3)
upward-pointing levers to which the operating
rods are attached. The operating rods,
approximately horizontal, are moved to the
rear of the device by the rotation of the jack
shaft.
The end of the operating rods remote from the
jack shaft levers is connected to the movable
contacts of the ground making switch. The
stationary contacts of the ground making
switch are mounted on the center insulating
barrier. Directly beneath the stationary
contacts are the movable contact kickoff
springs. When the moving contacts of the
ground making switch make contact with the
stationary contacts, the springs are loaded by a
force sufficient to assist their separation during
opening of the ground making switch.
In the linkage position shown in Figure 5, the
kickoff springs and the main opening spring
are both acting to compress the three (3) main
mechanism links (Figure 5). The linkage is
restrained from movement by the secondary
trip prop acting on the primary trip prop
roller. The component of force tends to make
the primary trip prop move downward, but it
is restrained by the secondary trip prop face
acting on the primary trip prop roller. The
clearance between the primary trip prop roller
and the secondary trip prop is controlled by
the primary trip prop adjusting screw. When
the trip shaft is rotated by the action of the
manual trip plate or the optional electric trip
solenoid (when furnished), the secondary trip
prop moves forward and permits the primary
trip prop to move down, thus permitting the
main linkage to move down and the jack shaft
to rotate, opening the ground making switch.
The left had of the jack shaft has a connection
for the opening spring. A projection of the left
hand operating lever also operates the auxiliary
switch (Figure 3, c).
With the standard electrical control scheme
(Figure 9), the closing spring is not charged
until a closing operation is called for by an
external signal. As soon as the spring is fully
charged, the tripped linkage can reset under
the action of the reset spring (Figure 5, l) and
the primary and secondary trip props can
fall into the reset position. The reset spring
stretches between an extension on the main
cam roller pin and a spring support pin located
on the right mechanism side sheet. The trip
latch check switch operated by a lever on the
trip shaft will now close. This allows the closing
solenoid to energize, closing the ground
making switch. The closing spring remains
discharged after a closing operation.

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Equipment Description
01.4IB.50026A
Figure 3 Mechanism - Top View
a. Grounding Switch Stationary Contacts
b. Grounding Switch Moveable Contacts
c. Auxiliary Switch
d. Ground Bus
e. Control Relay
f. Stored Energy Mechanism
g. Pawl Return Spring Weldment
h. Ratchet Wheel
i. Pawl Support Arm
j. Eccentric Roller
k. Crank Arm
l. Cam Shaft
a
b
c
d
e
f
h
k
i
jl
g

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12 Equipment Description
PowlVac® Electrically Operated 5kV & 15kV G&T Device
per ConEd Specication EO-2022-15 for ConEd CUSTOMER
01.4IB.50026A
Figure 4 Mechanism - Left View
a. Charging Motor
b. Shunt Trip Coil (when furnished)
c. Motor Cutoff Switch
d. Connecting Rod
e. Close Latch Adjusting Screw
a
b
c
d
e