ABB VM1/A/P Quick guide
—
MEDIUM VOLTAGE PRODUCTS
VM1/A/P
Installation and service instructions
ANSI: ... 15 kV; ... 2000 A; ... 31.5 kA
Table of Contents
For your safety! 2
1. Foreword 3
2. Introduction and safe practices 5
3. Receiving, handling, and storage 7
4. Insertion and removal, putting into service 11
5. Installation 16
6. Description 20
7. Operation 30
8. Maintenance 36
9. Spare parts and accessories 42
10. Product quality and environmental
protection 43
11. Overall dimensions 44
12. Electric circuit diagram 48
2VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
For your safety!
Make sure that the installation room (spaces,
divisions and ambient) is suitable for the
electrical apparatus.
Check that all the installation, putting into
service and maintenance operations are carried
out by qualified personnel with suitable
knowledge of the apparatus.
Make sure that the standard and legal
prescriptions are complied with during
installation, putting into service and
maintenance, so that installations according to
the rules of good working practice and safety in
the work place are constructed.
Strictly follow the information given in this
instruction manual.
Check that the rated performance of the
apparatus is not exceeded during service.
Check that the personnel operating the
apparatus have this instruction manual to hand
as well as the necessary information for correct
intervention.
Pay special attention to the notes indicated in
the manual by the following symbol:
Responsible behaviour safeguards your
own and others’ safety!
For any requests, please contact the ABB
Assistance Service.
MEDIUM VOLTAGE PRODUCTS 33
—
1. Foreword
1.1. Introduction
This publication contains the information needed to
install medium voltage VM1/A/P and VM1/A/PW
circuit breaker and put them into service.
For correct use of the product, please read it
carefully.
Like all the apparatus we manufacture, the VM1/A/P
and VM1/A/PW circuit breakers are designed for
different installation configurations.
However, they do allow further technical and
construction modifications (at the customer’s
request) to adapt to special installation
requirements.
For this reason, the information given below may
sometimes not contain instructions concerning
special configurations.
Apart from this manual, it is therefore always
necessary to consult the latest technical
documentation (circuit and wiring diagrams,
assembly and installation drawings, any protection
coordination studies, etc.), especially regarding any
variants requested in relation to the standardised
configurations.
For example, the racking and interlock sections do
not apply to the fixed mount breaker styles. All
information in this booklet was current at the time
1.2 Environmental protection
programme
The VM1 circuit breakers are manufactured in
accordance with the ISO 14000 Standards
(Guidelines for environmental management).
The production processes are carried out in
compliance with the Standards for environmental
protection in terms of reduction in energy
consumption as well as in raw materials and
production of waste materials. All this is thanks to
the medium voltage apparatus manufacturing
facility environmental management system.
Style Frame width (inches) Voltage rating Continuous current
rating
Interruption ratings
(symmetrical RMS)
Configurations
available
Drawout
Drawou
of printing. Unless otherwise noted, all references
in this booklet are determined by viewing the circuit
breaker from the front.
Only use original spare parts for maintenance
operations.
For further information, please also see the
technical catalogue of the circuit breaker.
All the installation, putting into service,
running and maintenance operations must
be carried out by skilled personnel with
in-depth knowledge of the apparatus.
4VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
1. Foreword
1.3 Drawout
A Drawout circuit breaker is a breaker that may be
removed from a cell without unbolting connections
or mounting supports. It is intended for use in ABB
PowerCube modules. It contains primary and
secondary disconnects and provides two operating
positions: Disconnect and Connect.
1.4. Information on this booklet
This booklet provides information for the VM1/A/P
circuit breakers as described below. Not all sections
of the bulletin apply to all types of VM1/A/P circuit
breakers. For example, the racking and interlock
sections do not apply to the fixed mount breaker
styles. All information in this booklet was current at
the time of printing. Unless otherwise noted, all
references in this booklet are determined by
viewing the circuit breaker from the front.
The purpose of this manual is to provide
instructions for unpacking, storage, installation,
operation, and maintenance for VM1/A/P vacuum
circuit breakers. This manual should be carefully
read and used as a guide during installation, initial
operation, and maintenance.
The specific ratings of each model circuit breaker
are listed on the individual nameplates. The VM1/
A/P circuit breakers are protective devices. As such,
they are maximum rated devices. In no event should
they be applied outside of their nameplate ratings.
1.5. Principle of extinction of the
vacuum interrupter
Given the relatively low static pressure of the
a relatively limited distance between the contacts is
required to obtain high dielectric strength. The
vacuum arc is extinguished on the first passage of
the current through natural zero.
Considering the limited distance between the
contacts, the high conductivity of the plasma of
metallic vapours, the drop in voltage of the arc and,
moreover, the short arcing time, the energy
associated with the arc is extremely limited,
therefore producing benefits for the useful life of
the contacts obtained and, consequently, for the
useful life of the vacuum interrupters.
1.6. Application of the X-ray
emission Standards
One of the physical properties of vacuum insulation is
contacts are open.
The specific tests carried out at the PTB laboratories
10 cm from the interrupter or pole surface, does not
exceed 1 mSv/h.
It follows that:
at the rated service voltage the use of vacuum
interrupters is absolutely safe;
application of the withstand voltage at industrial
and IEEE C37.04 Standards, is safe;
application of a voltage higher than the withstand
voltage at industrial frequency or of a direct current
test voltage in direct current, specified in the IEC,
VDE and ANSI/IEEE Standards, cannot be used;
phenomena, with interrupters with open contacts,
depends on keeping the specified distance between
the contacts.
This condition is intrinsically guaranteed by correct
operation of the operating mechanism and by
adjustments of the transmission system.
MEDIUM VOLTAGE PRODUCTS 55
—
2. Introduction and safe pratices
2.1. Introduction
The purpose of this manual is to provide
instructions for unpacking, storage, installation,
operation, and maintenance for VM1/A/P vacuum
circuit breaker. This manual should be carefully
read and used as a guide during installation, initial
operation, and maintenance.
The specific rating of each model circuit breaker
are listed on the individual nameplate. The VM1/
A/P circuit breaker are protective device. As such,
they are maximum rated device.
In no event should they be applied outside of their
nameplate ratings.
The VM1/A/P type vacuum circuit breakers are
switchgear.
In respect of the technical characteristics, VM1/
A/P circuit breakers are suitable for operation of
electric circuits under normal and fault service
conditions.
The vacuum circuit breakers have particular
advantages when used in systems with a high
frequency of operations and/or which lead to a
type vacuum circuit breakers stand out for their
particularly high operating reliability, extremely
long useful life expectancy and for being
The VM1/A/P type vacuum circuit breakers are
available in the withdrawable version. The basic
structure is shown in the “Technical data” section.
2.2. Safe practices
VM1/A/P circuit breakers are equipped with high
energy / high speed mechanisms. The design
includes several interlocks and safety features
which help ensure safe and proper operating
sequences. To ensure safety of personnel
associated with installation, operation, and
maintenance of these circuit breakers, the following
recommendations must be followed:
Only qualified persons, as defined in the National
Electric Safety Code, who are familiar with the
installation and maintenance of medium voltage
circuits and equipment should be permitted to work
on these circuit breakers
Read these instructions carefully before attempting
any installation, operation, or maintenance of these
power circuit breakers.
Do not work on an energized circuit breaker.
Do not work on a circuit breaker unless all
components are disconnected by means of a
visible break and securely grounded.
Do not work on a circuit breaker with power
supplied to the secondary control circuit.
Do not defeat safety interlocks. This may result in
bodily injury, death and/or equipment damage.
Do not work on a closed circuit breaker.
Do not work on a circuit breaker with charged
energy capacitors.
Do not use a circuit breaker by itself as the sole
means of isolating a high voltage circuit.
Do not leave a circuit breaker in an intermediate
position in a cell. Always place the circuit breaker
in the disconnect, test or connect position.
WARNING
The circuit breakers described in this book
are designed and tested to operate within
their nameplate rating. Operation outside
of these ratings may cause equipment to
fail, resulting in property damage, bodily
injury and/or death.
All safety codes, safety standards and/or
regulations as they may be applied to this
type of equipment must be adhered to
strictly.
NOTE
Failure to observe the requirements of
osha standard 1910.269 Can cause death
or severe burns and disfigurement. That
standard specifically prohibits the
wearing of polyester, acetate, nylon, or
rayon clothing by employees working with
exposure to electric arcs or flames.
6VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
2. Introduction and safe pratices
2.3. Standards and regulations
2.3.1. Fabrication
The VM1/A/P circuit breakers conform to the
following Standards:
IEEE C37.04
2.3.2. Installation and operation
For assembly and operation, please refer to the
relative regulations, and in particular to:
ANSI / NFPA70
NEC
2.4. Service conditions
Normal service conditions
Follow the recommendations in the IEC 60694 and
IEEE C37.09
IEEE C37.54
Ambient temperature
Maximum
apparatus for indoor installation
Humidity
The average value of the relative humidity, measured for a period
The average value of the pressure of the water vapour without
The average value of the relative humidity, measured for a period
The average value of the pressure of the water vapour, measured
Altitude
Climate
To avoid the risk of corrosion or other damage in areas:
with a high level of humidity, and/or
with rapid and large temperature variations, take appropriate
steps (for example, by using suitable electric heaters) to
prevent condensation phenomena.
For special installation requirements or other
operating conditions, please contact ABB.
CIRCUIT-BREAKER ANSI C37.04
VM1/A/P 15.12.32
C LASSIFICATION
SN 1VC1...............................PR. YEAR 2010
MASS 84 kg
VOLTAGE 15 kV
LIGHTNING IMPULSE WITHSTAND VOLTAGE 95 kV
FREQUENCY 60 Hz
NORMAL CURRENT 1200 A
SHORT TIME WITHSTAND CURRENT 31.5 kA
DURATION OF SHORT CIRCUIT 2 s
SHORT CIRCUIT BREAKING CURRENT 31.5 kA
D.C. COMPONENT < = 40 %
RATED INTERRUPTING TIME < = 50 ms
INSTRUCTION BOOK 1VCD600916R000
CABLE-CHARGING BREAKING CURRENT A
OPERATING SEQUENCE O-0,3S-CO-3MI N-CO
ELECTRICAL DIAGRAM 1VCD400051 (E0926)
FIG.01 FIG.02 FIG.05FIG.OS FIG.12
llllllllIIlllllllIlllllllIllllllllllllllllllIlIlllllllIlllllllIllllllllll
A3 OPERATING MECHANISM
-RL2 110 V
AUXILIARY VOLTAGE 110...250 V
100...240 V
Made by ABB, Italy
A
3
4
5
B
1 2
MEDIUM VOLTAGE PRODUCTS 77
VM1/A/P circuit breakers are subject to complete
factory production tests and inspection prior to
packaging and shipment. The shipping package is
designed to provide reasonable protection during
shipment and to provide convenient handling.
Accessories such as opening handles and racking
handles are shipped separately from the circuit
breaker.
The circuit breaker is shipped in special packing, in
the open position.
Each piece of apparatus is protected by a plastic
cover to prevent any infiltration of water during the
loading and unloading stages and to keep the dust
off during storage.
—
3. Receiving, handling and storage
On receipt, check the state of the apparatus,
integrity of the packing and correspondence with
the nameplate data (see Fig.1) with what is
specified in the order confirmation and in the
accompanying shipping notes.
Also make sure that all the materials described in
the shipping notes are included in the supply.
Should any damage or irregularity be noted in the
supply on unpacking, notify ABB (directly or
through the agent or supplier) as soon as possible
and in any case within five days of receipt.
The apparatus is only supplied with the accessories
specified at the time of ordering and validated in
the order confirmation sent by ABB.
Before carrying out any operation, always
make sure that the capacitors are
discharged and that the apparatus is in the
open position.
Caption
A Circuit breaker rating plate.
B Drive rating plate.
1 Type of apparatus.
2 Symbols of compliance with Standards.
3 Serial number.
4 Circuit breaker characteristics.
5 Characteristics of the drive auxiliaries.
Fig. 1
The accompanying documents inserted in the
shipping packing are:
instruction manual (this document)
test certification
identification label
copy of the shipping documents
electric wiring diagram.
Other documents which are sent prior to shipment
of the apparatus are:
order confirmation
original shipping advice notes
any drawings or documents referring to special
configurations/conditions.
3.1. Receiving and checking
1
8VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
3. Receiving, handling and storage
Immediately upon receipt of the circuit breaker(s),
examine the carton(s) to determine if any damage
or loss was sustained during transit. If damage or
indication of rough handling is evident, file a
damage claim at once with the carrier and promptly
notify the nearest district office. ABB is not
responsible for damage to goods which occur after
delivery. However, ABB will lend assistance if
notified of claims. Use care in unpacking the circuit
breaker to avoid damaging any circuit breaker
parts.
Unpack circuit breakers as soon as possible after
receipt. If unpacking is delayed, difficulty may be
experienced in making a claim for damages not
evident upon receipt. Check the contents of each
carton against the packing list before discarding
any packing material. If any discrepancy is
discovered, promptly notify the nearest district
office. Information specifying the purchase order
number, carton number, and part numbers of
damaged or missing parts should accompany the
claim.
3.2. Handling
VM1/A/P circuit breaker shipping containers are
designed to be handled by fork lift (not supplied).
Once removed from the shipping container, the
circuit breaker wheels are designed to move the
circuit breaker across a smooth, paved surface.
Care must be taken not to damage the secondary
plug (item 1, Figure 2a) when transporting, rolling,
or handling the VM1/A/P circuit breakers.
Fig.2a
DO NOT pull the circuit breaker by the front handles
with the circuit breaker in any position other than
full Disconnect to avoid injuries at the hands.
DO NOT move the circuit breaker by pushing on the
embedded pole assemblies or primary leads of the
embedded poles. Damage and misalignment of the
pole assemblies will occur if force is applied to
them.
Fig.2b
BC
13 2
A
3
MEDIUM VOLTAGE PRODUCTS 99
Version Pole centre
distance Rated current Hole
Withdrawable 150 mm up to 1250 A A
Withdrawable 210 mm up to 1250 A C
Withdrawable 210 mm from 1600 to 2500 A B
Lifting hook
The lifting hook is designed for general lifting and
lowering of the device, such as for removal from
shipping pallets or for lifting onto and off work
tables. The lifting hook is not designed to be used
for insertion or removal of the circuit breaker from
the switchgear compartment and therefore should
never be used for any such purposes, instead, use
the appropriate optional lift truck.
CAUTION
lifting circuit breaker to protect the
safety of personnel and equipment.
wear or damage before use.
or worn.
be suitably rated for lifting the circuit
breaker load.
installation of the lifting hook.
insertion of drawout circuit breakers into
switchgear compartments.
sole means of supportwhen servicing the
circuit breaker.
Fig.2c
Before carrying out any operations, always make
sure that the capacitors are discharged.
To lift and handle the circuit breaker, proceed as
follows (Fig. 2c):
use a special lifting tool (1) (not supplied) fitted with
ropes with safety hooks (2);
insert the hooks (2) in the supports (3) fixed to the
frame of the circuit breaker and lift. Latch the hooks
(2) into the support holes (3) according to the type
of apparatus (see table);
on completion of the operation (and in any case
before putting into service) unhook the lifting tool
(1) and dismantle the supports (3) from the frame.
During handling, take great care not to stress the
insulating parts and the terminals of the circuit
breaker.
Circuit breakers should be installed in their
permanent location as soon as possible. If the
circuit breakers are not placed in service for some
time, it is advisable to provide adequate means of
environmental protection. This may be done by
keeping the circuit breaker in its original shipping
container and storing it in a warm, dry, and
uncontaminated atmosphere. The circuit breakers
should be stored to minimize condensation.
Moisture can cause deterioration of metal parts
and high voltage insulation.
Prior to storage of the circuit breaker, verification
should be made that it is free from shipping
damage and is in satisfactory operating condition.
10 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
3. Receiving, handling and storage
CAUTION
The apparatus must not be handled by
putting lifting devices directly under the
apparatus itself. Should it be necessary to
use this technique, put the circuit breaker
onto a pallet or a sturdy supporting surface
(see fig. 3). In any case, it is always advisable
to carry out lifting using the supports (3).
3.3. Storage
When a period of storage is foreseen, our
workshops can (on request) provide suitable
packing for the specified storage conditions.
On receipt the apparatus must be carefully
unpacked and checked as described in Checking on
receipt.
If immediate installation is not possible, the
packing must be replaced, using the original
material supplied.
Insert special hygroscopic substances inside the
packing, using at least one standard packet per
piece of apparatus.
Should the original packing not be available and
immediate installation is not possible, store in a
corrosive ambient, away from any flammable
In any case avoid accidental impact or positions
which stress the structure of the apparatus.
CAUTION
The shipping containers provided are not
designed for stacking.
MEDIUM VOLTAGE PRODUCTS 1111
—
4. Insertion and removal, putting into service
Preliminary operations
Clean the insulating parts with clean dry cloths.
Check that the top and bottom terminals are clean
and free of any deformation caused by shocks
received during transport or storage.
4.1. Insertion and removal of
withdrawable circuit breaker
This section describes the process for inserting the
circuit breaker into the Disconnect position of the
switchgear and the removal of the circuit breaker
from the Disconnect position. Racking of the circuit
breaker to and from the Test Disconnect position is
covered in the next section. The following rules
must always be observed when inserting or
removing the circuit breaker device from the
switchgear compartment.
breaker from the circuit- breaker
compartment without the required ramp,
dolly or lift truck. Refer to the specific
switchgear installation and maintenace
manual for details.
breaker into any compartment prior to
inspection. Compare the circuit breaker
name plate rating with the switchgear
rating. Verify secondary voltages on the
circuit breaker and in the compartment.
breaker.
compartment to insure that it is free of
obstructions, tools, or other equipment.
Insertion: from Withdrawn position
1. Align the circuit breaker and ramp, dolly or lift
truck with the compartment (Fig. 4).
the circuit breaker to be inserted).
3. Push the circuit breaker into the compartment
with the handles. Interlocks may restrict
insertion. (Refer to Interlocks section)
with the compartment slots (Fig. 4).
5. Push the handles out to fully engage the cell
interlock tabs into the compartment slots.
6. Visually check that cell interlock tabs are
engaged in the compartment slots (if cell
interlock tabs are not fully extended, racking is
prevented).
7. The circuit breaker is now in the Disconnect
position.
Removal: to Withdrawn position
3. Pull the circuit breaker from the compartment
with the handles onto the required
transportation device.
4. The circuit breaker is now in the withdrawn
position.
4.1.1. Connection of the auxiliary circuits
for the auxiliary circuits must not be less than the
one used for the internal cabling AWG16.
Furthermore, they must be insulated for 3 kV test.
Please note that auxiliary circuits must be energized
with 2 kV (maximum test voltage) as per standards
indications.
The auxiliary circuits of withdrawable circuit
breakers are fully cabled in the factory as far as the
connector.
For the external connections, refer to the electric
wiring diagram of the switchgear.
disconnectors (Fig. 6).
4.1.2. Capacitor discharge circuit
Procedure for discharging the capacitor/s
Activate the circuit breaker.
Disconnect the power supply voltage.
Operate the circuit breaker by pressing the
The luminous “Ready” signal turns off when the
operation cycle has been completed, i.e. when the
circuit breaker is no longer ready for operations.
After 10 minutes have passed, the capacitor voltage
drops to a value of less than 15 V.
1
2
12 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
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4. Insertion and removal, putting into service
4.2. Putting into service
4.2.1. General procedures
WARNING
All the operations regarding putting into
service must be carried out by abb personnel
or by suitably qualified customer personnel
with in-depth knowledge of the apparatus
and of the installation. Should the
operations be prevented, do not force the
mechanical interlocks and check that the
operating sequence is correct. The operating
forces which can be applied for racking-in
withdrawable circuit breakers is < 25 nm.
Closing in case of a power failure
Closing is not advisable and is not possible.
Manual emergency opening
Use the crank handle 1 (Fig. 3) for manual
emergency operation.
Proceed as follows:
couple the crank handle (1) in the seat (2)
turn the crank handle (1) counterclockwise as far as
the switchgear/enclosure, it is now possible to take
it to the isolated position.
4.2.2. Operation of the circuit breaker
Closing
This can be carried out remotely by applying voltage
pushbutton on the front of the circuit breaker.
Opening
This can be carried out remotely by applying voltage
“O” pushbutton on the front of the circuit breaker.
Opening in case of a power failure
Opening can be carried out remotely by means of
the control system, or locally by pressing the “O”
pushbutton on the front of the circuit breaker
within 60 s from the power failure.
Notes
• Manual emergency opening is possible even after the 60 s time limit.
• In the case of a power failure and after the 60 s time limit, the circuit
breaker remains in its present position. If automatic opening is required
after the 60 s time limit, Dip Switch “I 1004/1” must be enabled (see pag.
31 Fig.13. Auto-shutdown function for low voltage of the capacitor/s).
Fig.3
MEDIUM VOLTAGE PRODUCTS 1313
4.2.3. Operations before putting into service
Before putting the circuit breaker into service, carry
out the following operations:
remove the lifting hooks;
check tightness of the power connections at the
circuit breaker terminals;
establish the setting of the primary electronic
overcurrent release (if provided);
check that the value of the power supply voltage of
the rated voltage of the electrical accessories;
remount any covers removed during the testing
operations;
check that no foreign bodies, such as bits of
packing, have got into the moving parts;
remount the covers which may have been removed
during the testing operations;
check that there is a sufficient exchange of air in the
installation place to avoid overtemperatures;
supply the auxiliary circuits with power;
function) before carrying out the closing operation;
check the functionality and efficiency of the
mechanical and electrical locks;
carry out a few circuit breaker opening and closing
operations by means of the pushbuttons on the
front of the circuit breaker;
in the case of a circuit breaker with motorized
isolation, check the direction of motor rotation and
also carry out the checks indicated in table T3.
T3
Item inspected Procedure Positive check
Insulation resistance. Medium voltage circuit
phases and the exposed conductive part of the circuit.
Mohm and in any case constant over time.
Auxiliary circuits
the insulation resistance between the auxiliary circuits and the
exposed conductive part.
N.B. Before carrying out the test, disconnect the earthing of the
electronic card from the circuit breaker frame and reconnect it after
the test.
The insulation resistance should be a few Mohm
and in any case constant over time.
Auxiliary circuits. Check that the connections to the control circuit are correct: proceed
with the relative power supply.
Operations and signals are normal.
Auxiliary contacts in the drive. Insert the auxiliary contacts in suitable signalling circuits.
Carry out a few closing and opening operations.
The signals take place normally.
Locking electromagnet on the
.
With the circuit breaker open, in the isolated for test position, and the
locking electromagnet not supplied, attempt to rack in the circuit
breaker.
operation.
Auxiliary transmitted contacts
signalling circuit breaker
switchgear or PowerCube
modules).
Insert the auxiliary contacts in suitable signalling circuits.
With the circuit breaker racked into the enclosure, carry out a few
traversing operations from the isolated for test position to the
The signals due to the relative operations take
place regularly.
14 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
4. Insertion and removal, putting into service
4.2.4. Structure and function
Summary of racking data
Fig. 4
Connect
Distance from Disconnected
Manual opening Yes Not recommended unless necessary
Electrical Operation Yes, while power cord is connect Yes, while power cord is connect
Control Power Available Yes, while power cord is connect Yes
Shutter CLOSED OPEN
Primary Contacts Engaged No Yes
Requirements to rack breaker from position Breaker Open / Power cord connect Breaker Open / Power cord connect
Notes A A
Notes A: Closed door is mandatory between all positions
Secondary
disconnects (B)
Racking screw collar
Shutters
Wheel rails
Compartment slots
1
5
7
2
1 8 6
3
MEDIUM VOLTAGE PRODUCTS 1515
Truck
The truck requires visual inspection of hardware,
lubrication, and operation during routine
maintenance.
With the circuit breaker outside the cell, verify all
visible hardware tightness, including handles (1)
and wheels (2). Wheels should rotate freely by hand
movement. Replace or tighten any missing or loose
hardware.
With the circuit breaker outside the cell, rotate the
racking screw as though racking the circuit breaker
to the Connect position.
This process will expose surfaces inside the truck
that need to be inspected and lubricated. Lubricate
the exposed parts; specifically the entire Racking
Screw (4. Inspect the circuit breaker locking tabs (3)
for any damage. Return truck to the Disconnect
position. As a precaution, do not operate the circuit
breaker outside the cell unless the truck is in the full
Disconnect position.
Truck
(shown with circuit breaker removed)
1 Handles
2 Weels
3 Locking tab
4 Racking screw
5 Secondary plug
6 Racking screw collar
7 -RL2
8 Truck locator channel
Fig. 4
Nr
5
0,05 0,1 23456789
10 20 30 40
50
0,2 0,3
0,4
0,5
0,6
0,7
1
2
2
2
2
1,5
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
6
7
89
10
Ia
(kA)
V1M
- 12-17,5 kV, 630/1250 A, 31,5 kA
In = 1250 A
In = 630 A
5
4
3
2
10
10
10
10
5
0,05 0,1 23456789
10 20 30 40
50
0,2 0,3
0,4
0,5
0,6
0,7
1
2
2
2
2
1,5
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
6
7
89
10
Ia
(kA)
In = 2500 A
In = 2000 A
In = 1600 A
V1M
- 12-17,5 kV, 1600 A, 31,5 kA><
5
4
3
2
10
10
10
10
Nr
16 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
5. Installation
5.2. Trip curves
opening cycles (No.) allowed, of the vacuum
interrupters, according to the breaking capacity (Ia).
Fig. 6a
5.1. General
Correct installation is of prime importance.
The manufacturer’s instructions must be
carefully studied and followed. It is good
practice to use gloves to handle the pieces
during installation.
The areas involved by the passage of power
conductors or conductors of auxiliary
circuits must be protected against access of
any animals which might cause damage or
disservices.
Fig. 6b
1
1
1
2
23
MEDIUM VOLTAGE PRODUCTS 1717
5.3. Interlocks/protection against
malfunction
A series of interlocks is provided to prevent
incorrect operations and/or malfunctions. The
interlocks are the following:
the withdrawable truck can only be moved from the
test/isolated position to the service position (and
vice versa) if the circuit breaker is open (this means
that first of all the circuitbreaker must be opened).
the circuit breaker can be closed if the withdrawable
truck is exactly in the defined test position or in the
service position (electric interlock).
the circuit breaker can be opened manually in the
service or test position when it is not powered, but
it cannot be closed.
the switchgear is provided with devices which only
allow connection and disconnection of the plug
connector (Secondary disconnects Fig. 4) (Fig. 7) in
the test/ isolation position.
Any detailed information regarding additional
interlocks, e.g. in connection with the earthing
switch operating mechanism, is given in the specific
order documentation.
Interlocks
The VM1/A/P circuit breaker contains a number of
interlocks. A description of each interlock follows as
encountered during racking of the circuit breaker
into the compartment.
Modification to interlocks can result in
hazardous conditions to personnel and
adjust interlocks.
Modification to interlocks may result in serious
bodily injury or death.
Interference blocking: A mechanical plug
interference blocking in the circuit breaker
compartment prevents under rated circuit breakers
from being inserted into higher rated
compartments. The code plate rating includes
continuous current, interrupting current, close and
latch capability, and maximum voltage.
Fig. 7a Fig. 7b
Max. 25 Nm
2
1
18 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
5. Installation
5.4. Racking
VM1/A/P circuit breakers are designed with two
positive racking positions: Disconnect, Connect. In
the Disconnect position the shutters are closed.
Electrical closing from the front panel is allowed for
up to 60 seconds without control power (if the
capacitors are fully charged) and manual opening is
allowed. Electrical operation of the circuit breaker is
allowed with control power supplied through the
secondary contacts with the shutters closed. As the
circuit breaker approaches the Connect position, an
increase in racking force is required to lift the
shutters and to engage the primary contacts. In the
Connect position, the primary disconnects are fully
engaged and the shutters are open. Electrical
operation of the circuit breaker through the
secondary contacts remains enabled.
Close door racking is mandatory between all
positions
1. Engage the racking handle (item 1 Figure 8) with
the racking screw collar (item 2 Figure 8).
breaker towards the primary contacts.
withdraws the circuit breaker away from the
primary contacts.
gradually to avoid shocks which may deform the
exceeded. If operations are prevented or difficult,
do not force them and check that the operating
sequence is correct.
Fig. 8
Racking-in
Racking-out
5.5. Disconnect through connect
1. Engage the racking handle (item 1 Figure 8) with
the racking screw collar (item 2 Figure 8).
breaker towards the primary contacts.
withdraws the circuit breaker away from the
primary contacts.
a. Verify switchgear door is CLOSED
b. Begin racking by rotating the racking handle
to the CLOCKWISE direction.
c. Twenty (20) revolutions (200mm) will move
the circuit breaker between the Test and
Connect positions.
The Connect position is indicated by a positive
lock, preventing further racking shaft rotation.
Closing of the circuit breaker is prevented
between Test and Connect positions.
5.6. Connect through disconnect
1. Perform a visual inspection of the circuit breaker:
a. Verify Close/Open Indicator shows OPEN.
b. Verify switchgear door is CLOSED.
a. Begin racking by rotating the racking handle
b. Twenty (20) revolutions (200mm) will move
the circuit breaker between the Connect and
Disconnect positions.
Closing of the circuit breaker is prevented
between Connect and Disconnect positions
MEDIUM VOLTAGE PRODUCTS 1919
5.7. Connect through disconnect
emergency rack out (Fig. 9)
1. In the case of a locking magnet –RL2 fault, in an
emergency the truck can be racked out manually
following the instructions below:
a. Open the circuit breaker
b. Verify Close/Open Indicator shows OPEN
c. cut off the power supply to the auxiliary
circuit
d. verify “READY” indicator lamp turns off and
wait 10 minutes.
e. open the enclosure door
f. remove the circuit breaker front protection
shield
g. using the manual lever, carry out an
emergency racking out operation, keeping
the moving anchor of the locking magnet
–RL2 pressed down by means of a screwdriver
Fig. 9
5.8. Installation of withdrawable
circuit breakers
The withdrawable circuit breakers are preset for
use in Vesta switchgear or PowerCube modules.
connect the auxiliary circuits thereby supplying the
locking electromagnet in the truck, fully insert the
crank handle (1) (Fig. 8) in the appropriate seat (2)
gradually to avoid shocks which may deform the
This value must not be exceeded. If operations are
prevented or difficult, do not force them and check
that the operating sequence is correct.
NOTE
To complete the racking-in/out operation,
about 20 turns of the crank handle are
required .
When the circuit breaker has reached the
connect/ disconnect position it can be
considered as racked into the switchgear
and, at the same time, earthed by means
of the truck wheels.
Withdrawable circuit breakers of the same
version, and therefore with the same
dimensions, are interchangeable.
For the circuit breaker installation
operations, also refer to the technical
documentation of the above-mentioned
switchgear.
CAUTION
The racking-in/out operations must always
be carried out with the circuit breaker open.
6
7
8
11.1
1.2
1.3
10
3
4
2
9
115
20 VM1/A/P - INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 KA
—
6.1. Basic structure of the
withdrawable circuit breaker
(Fig.10a)
The withdrawable truck (9), consists of a steel sheet
structure with wheels (3), on which the circuit
breaker with the relative auxiliary components, the
isolating contacts (10) for electrical connection
connector (1) for connection of the circuit breaker
auxiliary circuits are installed.
After having been racked into the switchgear and
hooked up, the withdrawable circuit breaker can
isolated for test (with connector inserted) and
automatically earthed by means of the truck wheels.
The magnetic actuator of the circuit breaker and
the relative controls and indicators, are accessible
from the front. Withdrawable circuit breakers of the
same type and characteristics are interchangeable.
However, the code of the connector prevents
incorrect combinations between the circuit breaker
and switchgear.
6.2. Circuit breaker structure of the
circuit breaker (Fig.10b)
The encapsulated poles are installed on the rear flat
section of the circuit breaker frame (1.1. Fig. 10a).
The live parts of the circuit breaker poles are
enclosed in cast resin and protected from impacts
and other external influences.
With the circuit breaker closed the current path for
each pole leads from the upper circuit breaker
terminal (1) to the fixed contact (2a) in the vacuum
interrupter (2), then via the moving contact (2b) and
the flexible connector (5) to the lower circuit
breaker terminal (4).
The change of contact state is delivered by means
of the insulated link rod (7) with internal contact
force springs (6).
5. Mechanical operating cycle counter
6. Mechanical CLOSE/OPEN indicator
7. Rating plate
8. Socket for emergency manual operation
9. Truck
10. Primary isolating contacts
11. Wheels
Fig. 10a
1. Secondary plug connector
1.1. Breaker frame
1.2. Front Plate
1.3. Slot for handling, both sides
2. “Ready” indicator
3. CLOSE push- button
4. OPEN push-button
This manual suits for next models
1
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