Document: GF07Z312 Rev 2
INSTALLATION & OPERATION MANUAL
HV6CS Vacuum Circuit Breakers – Fixed Type
7.2kV Voltage Class
APPLICABLE MODEL NUMBERS:
(Motor Operation Types)
HV6CS-MU
HV6CS-ML
Issued: December, 2012
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Important Notice
The instructions contained in this manual are not intended to cover all details or variations in
equipment types nor may it provide for every possible contingency concerning the installation,
operations, or maintenance of this equipment. Should additional information be required,
contact your Toshiba Customer Support Center.
The contents of this manual shall not become a part of or modify any prior or existing
agreement, commitment, or relationship. The sales contract contains the entire obligation of
Toshiba International Corporation. The warranty contained in the contract between the parties
is the sole warranty of Toshiba International Corporation and any statements contained herein
do not create new warranties or modify the existing warranty.
Any electrical or mechanical modifications to this equipment without the prior written
consent of Toshiba International Corporation may void all warranties or other safety
certifications. Unauthorized modifications may also result in safety hazard or equipment
damage.
Misuse of this equipment could result in injury and equipment damage. In no event will
Toshiba International Corporation be responsible or liable for direct, indirect, special, or
consequential damage or injury that may result from the misuse of this equipment.
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About This Manual
Every effort has been made to provide accurate and concise information to you, our customer.
At Toshiba International Corporation we are continuously striving for better ways to meet the
constantly changing needs of our customers. E-mail your comments, questions, or concerns
Purpose and Scope of Manual
This manual provides information on how to safely install, operate, maintain, and dispose of
your HV6CS breaker. The information provided in this manual is applicable to the HV6CS
breaker only.
This manual provides information on the various features and functions of this powerful device,
including:
• Installation
• Operation
• Mechanical and electrical specifications.
Included is a section on general safety instructions that describe the warning labels and
symbols that are used on the device and throughout the manual. Read the manual completely
before installing, operating, performing maintenance, or disposing of this equipment.
This manual and the accompanying drawings should be considered a permanent part of the
equipment and should be readily available for reference and review. Dimensions shown in the
manual are in imperial units and/or the metric equivalent. Connection drawings within this
document convey the typical topology of the HV6CS breaker.
Because of our commitment to continuous improvement, Toshiba International Corporation
reserves the right, without prior notice, to update information, make product changes, or to
discontinue any product or service identified in this publication.
Toshiba International Corporation (TIC) shall not be liable for direct, indirect, special, or
consequential damages resulting from the use of the information contained within this
manual.
This manual is copyrighted. No part of this manual may be photocopied or reproduced in any
form without the prior written consent of Toshiba International Corporation.
© Copyright 2012 Toshiba International Corporation.
TOSHIBA® is a registered trademark of Toshiba Corporation. All other product or trade
references appearing in this manual are registered trademarks of their respective owners.
All rights reserved.
Printed in the U.S.A.
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Contacting TIC’s Customer Support
Center
Toshiba International Corporation’s Customer Support Center can be contacted to obtain help
in resolving any Adjustable Speed Drive system problem that you may experience or to provide
application information.
The Support Center is open from 8 a.m. to 5 p.m. (CST), Monday through Friday. The Center’s
toll free number is US (800) 231-1412/Fax (713) 937-9349 CAN (800) 872-2192 MEX 01 (800)
527-1204.
For after-hours support follow the directions of the outgoing message when calling.
You may also contact Toshiba International Corporation by writing to:
Toshiba International Corporation
13131 West Little York Road
Houston, Texas 77041-9990
For further information on Toshiba International Corporation’s products and services, please
TOSHIBA INTERNATIONAL CORPORATION
HV6CS Circuit Breaker
Complete the following information and retain for your records.
Model Number: _____________________________________________________________________
Serial Number: _____________________________________________________________________
Project Number (if applicable):_________________________________________________________
Date of Installation: _________________________________________________________________
Inspected By: _____________________________________________________________________
Name of Application: ________________________________________________________________
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Table of Contents
General Safety Information ………………………………………………………………………. 1
Safety Alert Symbol ……………………………………………………………………….. 1
Signal Words ………………………………………………………………………………. 1
Equipment Warning Labels ………………………………………………………………. 2
Qualified Personnel ……………………………………………………………………….. 2
Equipment Inspection …………………………………………………………………….. 3
Handling and Storage …………………………………………………………………….. 3
Disposal ……………………………………………………………………………………. 4
During Use………………………………………………………………………………………….... 5
1. Part Names …………………………………………………………………………………….…. 8
2. From Receipt to Storage…………………………………………………………………….…. 9
2.1 Receipt and Unpacking …………………………………………………………………………
9
2.2 Transport ……………………………………………………………………………………….... 10
2.3 Storage …………………………………………………………………………………………… 12
3. Installation ……………………………………………………………………….………………. 13
3.1 Mounting the VCB …………….………………………………..…………………………..……13
3.2 Main Circuit Terminal …………………………………………………………….…………...…16
3.3 Ground Terminal Connections ……………………………………………………………….…17
3.4 Control Circuit Cable Connections ………………………………………….……………….…17
4. Operation …….…………………………………………………………………………………... 18
4.1 Manual Operation ……………………………………………………….……………………… 18
4.2 Electrical Operation …………………………………………………….…………………….... 21
4.3 Control Circuit .…….…………………………………………………….……………………... 22
5. Maintenance/Inspections …..………………………………………………………………… 24
5.1 During Maintenance/Inspections …..……….………………………………………………... 25
5.2 Types of Maintenance and Inspection Work ……..…………………..…………………….. 25
5.3 Inspection Frequency …....……..……………………………………….………………….… 25
5.4 Periodic Inspection Checkpoints ……………………………….………..……………….….. 26
5.5 Vacuum Check …………………….…………………………….…………...…………….….. 27
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General Safety Information
DO NOT attempt to install, operate, maintain, or dispose of this equipment until you have read
and understood all of the product safety information and directions that are contained in this
manual.
Safety Alert Symbol
The Safety Alert Symbol is comprised of an equilateral triangle enclosing an exclamation
mark. This indicates that a potential personal injury hazard exists.
Signal Words
Listed below are the signal words that are used throughout this manual followed by their
descriptions and associated symbols. When the words DANGER, WARNING, and CAUTION
are used in this manual, they will be followed by important safety information that must be
carefully followed.
The word DANGER preceded by the safety alert symbol indicates that an imminently
hazardous situation exists that, if not avoided or if instructions are not followed precisely, will
also occur.
DANGER
The word WARNING preceded by the safety alert symbol indicates that a potentially
hazardous situation exists that, if not avoided or if instructions are not followed precisely,
could result in serious injury to personnel or loss of life.
WARNING
The word CAUTION proceeded by the safety alert symbol indicates that a potentially
hazardous situation exists that, if not avoided or if instructions are not followed precisely, may
result in minor or moderate injury.
CAUTION
The word NOTE provides helpful information.
NOTE
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Equipment Warning Labels
DO NOT attempt to install, operate, perform maintenance, or dispose of this equipment until
you have read and understood all of the product labels and user directions that are contained
in this manual.
Warning labels that are attached to the equipment will include the exclamation mark within a
triangle.
DO NOT remove or cover any of these labels. If the labels are damaged or if additional labels
are required, contact the Toshiba Customer Support Center.
Labels attached to the equipment are there to provide useful information or to indicate an
imminently hazardous situation that may result in serious injury, severe property and
equipment damage, or loss of life if safe procedures or methods are not followed as outlined
in this manual.
Qualified Personnel
Installation, operation, and maintenance shall be performed by Qualified Personnel ONLY.
A Qualified Person is one that has the skills and knowledge relating to the construction,
installation, operation, and maintenance of the electrical equipment and has received safety
training on the hazards involved (Refer to the latest edition of NFPA 70E for additional safety
requirements).
Qualified Personnel shall:
• Have carefully read the entire manual.
• Be familiar with the construction and function of the ASD, the equipment being driven, and
the hazards involved.
• Be able to recognize and properly address hazards associated with the application of
motor-driven equipment.
• Be trained and authorized to safely energize, de-energize, ground, lock-out/tag-out circuits
and equipment, and clear faults in accordance with established safety practices.
• Be trained in the proper care and use of protective equipment such as safety shoes, rubber
gloves, hard hats, safety glasses, face shields, flash clothing, etc., in accordance with
established safety practices.
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Equipment Inspection
• Upon receipt of the equipment, inspect the packaging and equipment for shipping damage.
• Carefully unpack the equipment and check for parts that may have been damaged during
shipping, missing parts, or concealed damage. If any discrepancies are discovered, it should
be noted with the carrier prior to accepting the shipment, if possible. File a claim with the
carrier if necessary and immediately notify your Toshiba Customer Support Center.
• DO NOT install the ASD if it is damaged or if it is missing any component(s).
• Ensure that the rated capacity and the model number specified on the nameplate conform to
the order specifications.
• Modification of this equipment is dangerous and is to be performed by factory trained
personnel ONLY. When modifications are required contact your Toshiba Customer Support
Center.
• Inspections may be required after moving the equipment.
• Contact your Toshiba Customer Support Center to report discrepancies or for assistance if
required.
Handling and Storage
• Use proper lifting techniques when moving the breaker; including properly sizing up the load,
getting assistance, and using a forklift if required.
• Store in a well-ventilated location and preferably in the original packaging if the equipment
will not be used upon receipt.
• Store in a cool, clean, and dry location. Avoid storage locations with extreme temperatures,
rapid temperature changes, high humidity, moisture, dust, corrosive gases, or metal particles.
• The storage temperature range of the breaker is 23° to 104° F (-5° to 40° C).
• DO NOT store the unit in places that are exposed to outside weather conditions (i.e., wind,
rain, snow, etc.).
• Store in an upright position.
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Operating the VCB
Failure to take the opportunity to discover abnormalities can result in injuries and
equipment damage. Always check to make sure that the ON and OFF indicators are
correct before operating the equipment.
To avoid damaging the equipment, do not close the circuit when the unit switching
indicator is ON.
Connecting and disconnecting the main circuit
To avoid injury and damage to the equipment, do not remove the holding pin unless you
are moving the VCB outside the panel.
To prevent electric shock or other injury, follow the instructions given in the instruction
manual when moving the equipment in or out of the panel.
Disposal
Never dispose of electrical components via incineration. Contact your state environmental agency for
details on disposal of electrical components and packaging in your area.
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During Use
Installation location
To prevent damage to the VCB or performance degradation, do not store or install it in the
following locations:
* Places whose ambient temperature is outside the range of -5C to 40C (23F to
104F). This may result in damage or performance degradation.
* Places exceeding 1000 m (3300 ft) elevation.
This may result in damage or performance degradation.
* Places where excessive dust is produced.
This may result in damage or performance degradation.
* Places where corrosive gases are produced.
This may result in fire, damage or performance degradation.
* Places with very high or very low humidity.
This may result in damage or performance degradation.
* Places subject to extreme variations in temperature.
This may cause condensation to form and result in damage or performance
degradation.
* Places subject to vibrations.
This may result in damage or performance degradation.
* Inclined locations.
This may result in damage or performance degradation.
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Special environmental conditions
When using the VCB in special environments, check the points in Table 1 below.
Table 1 Points to Check When Using the Circuit Breaker in Special Environments
Special
Practical example
Check points
environmental
condition
Contamination
* Large amounts of dust.
* Reduce the size of the ventilation duct
* Make sure the wind does not blow
* Salt corrosion (locations near the
seashore or where winds containing directly at the location where the
salts blow)
ventilation duct is installed
* Install a filter
High humidity
* Places subject to frequent and/or
strong rainstorms or snowstorms
* Use a cubicle construction that will
prevent condensation from forming
* When there is a cooling tower or
other large water source nearby
* Use a cubicle construction that will
prevent the wind from blowing directly
into the cubicle
* Where there is condensation (which
forms when the humidity in the
cubicle drops dramatically)
* Install a space heater
Corrosive gases
* When corrosive gases are produced * Use a cubicle construction that
at plants handling raw materials, at
water treatment plants, in hot
springs regions etc. (hydrogen
chloride, sulfurous acid, nitrogen
oxide, ammonia, chlorine, ozone
etc. or other gases)
enables the cubicle to be blocked off
from the outside air to the greatest
extent possible
* Install a filter
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Applicable standards pertaining to switching surges
Consult Table 2 for the standards applicable to VCB switching surges.
Table 2 Applicable Standards Pertaining to Switching Surges
Circuit
breaker
type
Load type
Rotating
Dry type
transformer
(insulation
resistance
below
Oil-immersed
transformer
(insulation
resistance
class A)
When there is
electronic
equipment on
transformer
low voltage
side
Phase advance
capacitor *4, *5
machine *1
class A)
Ordinary
Protected by CR Protected by
No special
restrictions
Protected by CR 6.6 kV circuit:
suppressor *6
surge
suppressor *6
No special
suppressor
restrictions
up to 300 kVA
Low surge
type
No special
No special
No special
restrictions
Protected by CR 6.6 kV circuit:
restrictions *2
restrictions *3
suppressor *6
No special
restrictions
up to 4000 kVA
*1. Mainly induction motors, but also includes synchronizing generators for private generator
equipment.
*2. Use a CR suppressor for surge protection when inching at 55 kW (75HP) or below and on
inductance regulators.
*3. Use an arrester for surge protection on circuits that require cutting off of excitation rush current.
*4. When the capacity of the group of capacitors exceeds 300 kVA, insert a series reactor (6%).
*5. For high-frequencies included in the applicable circuit, use 135% or below of the fifth harmonic
as established in the standards for phase advance capacitors (JIS C 4801).
*6. Table 3 shows the models of applicable CR suppressor.
Table 3 CR Suppressors
Circuit voltage
CR suppressor model
NV60K304T1
6.6 kV
(three-phase)
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1. Part Names
SHAFT FOR MANUAL
CHARGING HANDLE
MAIN
CIRCUIT
TERMINAL
ON-OFF
INDICATOR
AUXILIARY
SWITCH
SECONDARY
TERMINAL
BLOCK
SPRING
INDICATOR
CLOSE
LEVER
TRIP
LEVER
COUNTER
Figure 1 U Type Circuit Breaker (main circuit terminals on upper left and right)
SHAFT FOR MANUAL
CHARGING HANDLE
MAIN
ON-OFF
CIRCUIT
TERMINAL
INDICATOR
AUXILIARY
SWITCH
SECONDARY
SPRING
INDICATOR
TERMINAL
BLOCK
CLOSE
LEVER
TRIP
LEVER
COUNTER
Figure 2 L Type Circuit Breaker (main circuit terminals on rear top and bottom)
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2. From Receipt to Storage
2.1 Receipt and Unpacking
Each VCB unit is carefully tested and inspected prior to shipment, so it can be used as soon as it
has been unpacked. However, just in case something should be amiss, you should check the
following:
(1) When the box is delivered, check to make sure it is not damaged or warped.
(2) Remove the unit from the box carefully to avoid damaging it.
To prevent injury or damage to the equipment, make sure the unit is
standing straight up. NEVER lay it on its side or place it upside-down.
CAUTION
(3) Make sure the accessories (see Tables 4 & 5) are present and no parts are missing or
damaged.
To prevent electric shock or other injury, do not use the unit if it has
been
WARNING
damaged.
(4) Contact your dealer in the event of missing parts, damage, etc.
Table 4 List of Accessories (VCB)
Part
Appearance
Quantity
Insulating cylinder
6
Handle (with mounting
screw)
Shipped together with the
VCB unit
1
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2.2 Transport
Use the proper procedures when moving or transporting the unit.
Failure to use the proper (authorized) methods may damage the
unit or cause it to fall, resulting in injury.
CAUTION
Figure 3 WRONG (Incorrect Method of Transportation)
2.2.1 Transporting U Type VCBs (main circuit terminals on top left and right)
Holes for lifting
Dia. 13 holes on both sides
Figure 4 Lifting the VCB (Correct Method of Transportation)
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2.2.2 Transporting L Type VCBs (main circuit terminals on rear top and bottom)
Holes for lifting
Dia. 13 on both sides
Figure 5 Lifting the VCB (Correct Method of Transportation)
2.2.3 Transportation (Manual handling)
The circuit breaker shall be moved by two (2) persons as shown in Fig. 6.
Figure 6 Transporting the VCB (Correct Method of Transportation)
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2.3 Storage
Use the following procedures if the VCB will not be operated for a long period of time after it
has been installed, or if it must be stored for a long period of time prior to installation. Be sure
to observe the precautions for storage and installation locations (see page 5).
(1) When storing the unit, cover it with a dust cover.
(2) Avoid locations subject to high humidity or exposed to direct sunlight.
(3) Inspect the unit periodically and make sure there are no problems such as condensation,
moisture absorption, rust, corrosion or insects inside the equipment. If such problems are
discovered, inspect the equipment carefully and repair it before it is operated.
To prevent electric shock or other injury, do not use the unit when a
problem has been discovered during an inspection of that unit.
WARNING
To prevent injury or damage to the equipment, make sure the unit is
standing straight up. NEVER lay it on its side or place it upside-down.
CAUTION
(4) When the equipment has been stored or has been idle for a long period of time, do not
install or begin operating the unit immediately. Perform the procedures listed in sections
7.3 and 7.4 and the withstand voltage test* for the control circuit to make sure there are no
problems before installing or operating the unit.
*The withstand voltage on control circuits
The withstand voltage test for motor spring operation type circuit breaker shall be
performed in charged condition.
The power frequency withstand voltage on control circuits except charging motor is 2000V
AC, since the withstand voltage for charging motor is 1500V AC.
The motor circuit shall be disconnected before withstand voltage test on control circuits.
(Example: The connector plug (white) on upper-center of control board should be
disconnected (pull out) after removing the front cover of circuit breaker. This will make the
motor circuit disconnect
Note: The connector plug and front cover must be returned to proper position after
withstand voltage test.
CONNECTOR PLUG
(WHITE)
CONTROL
BOARD (UNIT)
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3. Installation
Make sure the location satisfied the requirements listed under Storage and Installation
Location (page 3) and check the dimensions using the diagrams in other catalogs or external
view diagrams and panel cut diagram. Prior to installation, the maximum fault current capacity
of the power system at the point of installation should be verified. This value must not exceed
the symmetrical interrupting capability of the circuit breaker. See typical circuit breaker
nameplate below.
Do not exceed the ratings specified on the breaker nameplate or
system accessories. Underrated equipment can fail during operation
causing fire, explosion, severe injury, death, and property damage.
DANGER
Typical Circuit Breaker Nameplate
3.1 Mounting the VCB
3.1.1 Mounting in the panel
The standard panel thickness is t3.2. Consult Toshiba when using with other thicknesses.
To mount the VCB, perform the steps shown in Figures 8 through 10 in that order, referring
to the tightening torque in Table 5.
Figure 8 Align to the panel holes
and mount the VCB with two (2)
upper bolts on the panel.
Figure 7 Remove the four (4) panel
mounting bolts (M8) and two (2) pan-head
screws (M4) from the VCB.
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Screw
Tightening
Screw
nominal
dia.
Tightening torque
nominal torque
dia.
M4
M5
M6
1.47 to 1.96 N-m
M8
11.8 to 14.7 N-m
(120 to 150 kgf-cm)
24.5 to 30.9 N-m
(250 to 315 kgf-cm)
44.1 to 55.4 N-m
(450 to 565 kgf-cm)
(15 to 20 kgf-cm)
2.94 to 3.92 N-m
(30 to 40 kgf-cm)
4.90 to 6.37 N-m
(50 to 65 kgf-cm)
M10
M12
Table 5 Tightening Torque
Figure 9 Fix the front plate onto panel
with two (2) M8 bolts and two (2) M4
screws removed at step shown in Fig. 8.
3.1.2 Mounting Directly onto the Floor
The VCB should be mounted to a surface with a levelness of ±0.5 mm. If there are any large
gaps, use spacers to adjust. Check to make sure that the VCB is in OPEN status, and then
mount it using the steps shown in Figures 10 and 11 in that order.
.
ANGLE
PANEL
Figure 11 Either mounting
method may be used.
Figure 10 Fasten the VCB onto an angle or a flat plate. The
use of M8 hexagonal bolts (either 50 mm or 35 mm) is
recommended. The tightening torque should be 11.8 to 14.7
N · m (120 to 150 kgf · cm).
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3.1.3 Mounting method for the model provided one-person installation hook
The thickness of panel shall be 3.2 mm, consult nearest sales office for other thickness.
The mounting should be performed as described in Fig. 12 through Fig. 15.
Figure 12 Remove the panel mounting bolts
(M8 – 4 bolts and M4 – 2 pan-head screws).
Figure 13 Suspend the breaker using with
mounting hooks (2- locations) on panel,
and fix the breaker to panel by bolts (M8 –
2 bolts).
Figure 14 Fix the surface plate to panel with
bolts and screw (M8 – 4 bolts and M4 – 2
pan-head screws) removed at work of Fig. 12.
The tightening torque should be 11.8 to
Figure 15 Fix the manual charging handle
with screw (M5 – 1 piece) referring the
tightening torque should be 2.94 to3.92 N · m
(30 to 40 kgf · cm).
14.7 N · m (120 to 150 kgf · cm) (at M8).
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3.2 Main Circuit Terminal Connections
Perform the steps shown in Figures 16 through 20 in that order.
Figure 16 Pass the cable or conductor
through the insulating cylinder.
Figure 17 Fasten the cable or conductor
to the main circuit terminal. The use of
30 mm or 35 mm hexagonal bolts for
M10 threads and 35 mm hexagonal bolts
for M12 threads is recommended.
Figure 18 Use both hands to connect the
cable or conductor to the terminal.
Figure 19 Do NOT connect the cable or
conductor to the terminal using only
one hand, as this may damage the
insulating frame.
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Table 6 Tightening torque
Screw
Tightening torque
11.8 – 14.7 N m
(120 – 150 kgf cm)
M8
24.5 – 30.9 N m
(250 – 315 kgf cm)
M10
M12
44.1 – 55.4 N m
(450 – 565 kgf cm)
Figure 20 Set the insulating cylinder in place, then
check to make sure that the hook is engaged.
3.3 Ground Terminal Connections
The ground terminal is on the left side of the terminal block as viewed from the rear of the VCB. To
connect the ground line to the terminal, perform the steps shown in Figures 21 and 22 in that order.
CRIMP
Figure 21 Crimp the ground line to the
crimp-on terminal provided with the unit.
Figure 22 Fasten the crimped terminal
using the hexagonal bolt (M8) provided
with the unit.
3.4 Control Circuit Cable Connections
Figure 23 The control circuit is connected to
the terminal block on the top of the operating
mechanism. Connect as shown in the
connection diagram in section 4.3.
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4. Operation
Failure to take the opportunity to discover abnormalities can
result in injuries and equipment damage. Always check to make
sure that the ON and OFF indicators are correct before
operating the equipment.
CAUTION
4.1 Manual Operation
To avoid damaging the equipment, do not close the circuit when
the unit switching indicator is ON.
CAUTION
4.1.1 Closing the Circuit
Check to make sure that the switching status is set to OFF.
4.1.1.1 For Motorized Spring-operated VCBs
First of all, attach the handle (see Figure 24 for a picture showing the handle installed).
The manual charging handle shall be applied for emergency case and maintenance purpose only,
remove (not install) the handle at normal service condition.
Figure 24 Tighten the small screw (M5)
provided, fasten the handle in position.
The tightening torque should be 2.94 to
3.92 N · m (30 to 40 kgf · cm).
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(1) When the spring is released -
Perform the steps shown in Figures 25 and 26 in that order.
CHARGING
HANDLE
CLOSED
LEVER
Figure 25 Turn the handle clockwise 3 to 5
times and make sure that the spring status
is taut.
Figure 26 Press the closed lever (green) in
the direction of the arrow to close the
circuit. When the switching status will
change to ON, the VCB is set in close
state.
(2) When the spring is taut -
Perform the step shown in Figure 27 in that order.
CLOSED
LEVER
Figure 27 Press the closed lever (green) in
the direction of the arrow to close the
circuit. When the switching status changes
to ON, the VCB is set in the closed state.
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4.1.2 Opening the Circuit
This operation is the same for both motorized and manual spring-operated VCBs.
TRIP
LEVER
Figure 28 Press the trip lever (red) in the
direction of the arrow to open the circuit.
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4.2 Electrical Operation
Electrical operations are performed as shown in the flow diagram below.
Circuit breaker OPEN
Control power applied
Motor begins operating
・Springs begin tightening
・Spring status changes to yellow
Springs Charged・Motor stops
・CLOSE operation standby
CLOSE signal given
CLOSE coil energized
Spring changes to white and switching
status changes to ON
Circuit breaker CLOSED
Auxiliary relay closes
Motor begins operating
・Spring begins tightening
Anti-pumping circuit completed
OPEN signal given
Spring taut・Motor stops
Spring status changes to yellow
OPEN/TRIP coil energized
Circuit breaker OPEN
Switching status changes to OFF
Next CLOSE operation is NOT possible
until the CLOSE signal is canceled.
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4.3 Control Circuit
4.3.1 Motorized Operation
Figure 29 Control Circuit
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4.3.2 Undervoltage Trip
All HV6CS breakers are furnished with an undervoltage trip device. The Undervoltage trip device
operates to trip the circuit breaker OFF unless 120VAC control power is present at the terminals of
the UV (TC4) trip coil.
When the circuit breakers are shipped, the Undervoltage trip device is defeated by a factory
installed plug (Fig. 30). If this plug is left in place, the circuit breaker will operate normally without
power applied to the UV coil. Removing this plug (Fig. 31) activates the undervoltage trip function.
Figure 30 Plug Installed in UV Trip Device
Figure 31 Removing Plug From UV Trip Device
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5. Maintenance/Inspections
To prevent electric shock, turn off the power before starting
maintenance and inspections.
To prevent electric shock or other injury, check to make sure that
the unit status indicators read OFF and DISCHARGED before
beginning maintenance and inspection work.
To prevent electric shock, do not touch charged parts.
WARNING
Keep fingers and other body parts, objects, etc. away from the unit
mechanism, as you may become caught in the mechanism and
injured.
To prevent electric shock or other injury, do not attempt to modify
the lock mechanism on the disconnecting switch mounted on the
unit power side.
Hazardous voltage can cause serious injury or death. Make sure
maintenance and inspection work is performed only by authorized
personnel.
The VCB should be maintained and inspected periodically to maintain performance and
ensure a long service life. Operating and environmental conditions will usually dictate the
frequency of inspection required. NFPA Publication 70B "Electrical Equipment Maintenance"
may be used as a guide for setting up the maintenance program.
Contact with energized components can cause severe injury, death and
DANGER
property damage. Turn off and lock-out primary and control circuit power
before servicing.
Improper maintenance can cause severe injury, death and property damage.
Only qualified and authorized persons are to install, operate or service this
equipment.
WARNING
WARNING
Grease is conductive. Do not allow grease or any other substances to
contaminate insulating materials. Contaminated insulators can allow a short
circuit or ground fault to occur.
MAINTENANCE RECORD
Keep a permanent record of all maintenance work. At a minimum, this record should include:
1) Items inspected
2) Reports of any testing
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3) Equipment condition
4) Corrective actions or adjustments
5) Date of work
5.1 During Maintenance/Inspections
Before inspecting the electrical circuits, take the following measures to prevent electric shock:
1) After opening circuit for the VCB, open the disconnect switch on the power source side to
place the main circuit and control circuits of the VCB in no-voltage status.
2) Lock the disconnect switch to prevent operation and label it with an "INSPECTION IN
PROGRESS" tag.
3) Using a voltage detector, check to make sure that the circuits are in no-voltage status and
ground the necessary circuits.
Discharge the residual charge from capacitors and cables before grounding. Space heaters,
resistors and other units will remain hot even after they have been turned off. Install a
protective cover temporarily, or wait until after the units have cooled to perform the inspection.
To ensure safety, remove the ground line after the inspection is complete and return the
equipment to its previous status.
5.2 Types of Maintenance and Inspection Work
Receiving inspection
A visual inspection for damage, deformation, missing parts and switching status (manual)
to make sure that the product is in the same status as when it was shipped.
Patrol inspection
An inspection performed during patrols to check for abnormal noise or odor and see if
there is anything wrong with the equipment during operation.
Periodic inspection
The equipment is shut off and a check made of the operation of the mechanism to make
sure there is nothing wrong. The lubrication status of sliding and rotating parts is also
checked and the mechanism is lubricated if needed.
Unscheduled inspection
Inspections that are implemented as required.
5.3 Inspection Frequency
The inspection frequency and points to be inspected will differ depending on the status of use,
frequency of switching, the size of the breaking current and other factors. In general,
inspections should be implemented at the intervals shown in the table below.
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Type of inspection
Patrol Inspection
Inspection frequency
Once every 6 months
Periodic Inspection
Normal
Once every 1 to 3 years or every 3,000 operations
Once every 6 years
Detailed
Unscheduled Inspection
As needed
5.4 Periodic Inspection Checkpoints
Table 7 Periodic Inspection Checkpoints
No. Location
Item
Inspection
method
Criteria
Disposition
Remarks
1 Operating
Loose bolts,
Tighten using
Make sure all
Tighten if
loose.
See Table 5
for
mechanism nuts or screws screwdriver or
wrench.
bolts, nuts and
screws are tight.
ightening
torque.
Dust or foreign Visual
Make sure there is Wipe with a
matter inside
inspection.
no dust or foreign
matter.
dry cloth.
Indicator
operation
Visual
Make sure
Check the
inspection.
switching status is cause and
properly displayed. repair.
Part warping
Visual
Make sure no
parts are warped
or missing.
Check the
cause and
repair.
inspection.
Smooth action Manual
operation.
Make sure action
is smooth and
shafts turn
If action is not
smooth,
Visual
apply a small
amount of
lubricant.
inspection or
touch. See
Lubrication
Manual
smoothly.
2
Main circuit Discoloration
due to heat
from
Visual
Make sure there is Check the
inspection.
no discoloration.
cause and
repair.
conducting
parts
Loose bolts,
Tighten using a
Make sure all
Tighten if
loose.
See Table 5
for
nuts or screws wrench.
bolts, nuts and
screws are tight.
tightening
torque.
Dust on
Visual
Make sure there is Wipe with a
surface of
Interrupter.
inspection.
no surface dust.
clean dry
cloth.
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No. Location
Item
Inspection
method
Criteria
Disposition
Remarks
If damaged,
Toshiba.
3
Insulator
Dust, foreign
matter or
Visual
Make sure there Wipe with a
inspection.
is no dust,
clean dry cloth. contact
damage
foreign matter or
breakage.
4
Auxiliary
switch
Terminals
loose or
Visual
Make sure
Repair if
See Table 5
for
inspection.
terminals are not disconnected.
disconnected
Tighten using a loose or
screwdriver. disconnected.
Case/contacts Visual
inspection
Tighten if
loose.
tightening
torque.
Make sure there Replace if
is no damage or damaged or
Warping.
Make sure circuit If circuit fails to
warped.
5
Control
circuits
Smooth
Supply
movement
when
electricity to
operate the
circuit.
operates
smoothly.
operate, check
the cause and
repair.
electricity is
supplied
Terminals
loose or
Visual
Make sure
Repair if
See Table 5
for
inspection.
terminals are not disconnected.
disconnected
Tighten using a loose or
Tighten if loose tightening
torque.
screwdriver.
disconnected.
6
Insulation
If the insulation
resistance
resistance
measurement
Measurement
point
Insulation
Tester
1000 V
500 V
between the
main circuit
resistance
Main conductor to
ground
500M
or greater
2M
terminals is
low, wipe the
vacuum valve
and insulator
surface with a
clean dry cloth
and repeat the
test.
Group of control
circuits to ground
Between main
circuit
or greater
1000 V
100M
or greater
terminals
5.5 Vacuum Check
A sufficient level of vacuum is necessary for proper performance of the vacuum interrupters. Although
vacuum leaks are rare, the vacuum integrity should be checked periodically. The relationship between
dielectric breakdown voltage of the contact gap and internal vacuum interrupter pressure has been found
to be generally predictable. Therefore, vacuum interrupter integrity is checked by performing a high
potential test across the open gap of the interrupter.
TEST EQUIPMENT:
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Toshiba offers a compact vacuum checker (Type CI35-1D, see Figure 32) which enables a quick and
easy check on vacuum interrupter internal pressure. Alternatively, any commercially available AC high
potential tester may be used which is capable of delivering at least 25 milliamperes at 22 kV for a period
of one minute.
Figure 32 Toshiba Portable Vacuum Checker
PRECAUTIONS:
Applying abnormally high voltage across a pair of contacts in vacuum may produce X-rays. The radiation
may increase with the increase in voltage and/or decrease in contact spacing. X-radiation produced
during this test with recommended voltage and normal contact spacing is extremely low and well below
the maximum permitted by standards. As an additional safety measure, it is recommended that all
personnel keep at least 1 meter (3.3 ft) away from the vacuum circuit breaker while this test is
performed.
Radiation exposure hazard. X-rays may cause illness or injury.
WARNING
WARNING
Stay at least 1 meter (3.3 ft) away from the circuit breaker
during the vacuum check test .
Hazardous voltages are present during dielectric testing which
can result in severe injury or death. Only qualified personnel
should conduct this testing.
See Figure 33 for sample withstand voltage test circuit.
Figure 33 Sample Withstand Voltage Test Circuit
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TEST PROCEDURE:
1. The circuit breaker should be disconnected from the main circuit and be in the OFF position.
2. Connect all the line side primary terminals together and to the output of the vacuum checker or AC
hi-pot machine. Connect all the load side primary terminals together and to the ground terminal of
the vacuum checker or AC hi-pot machine.
3. Increase the voltage from zero to 22kV AC at a rate of approximately 2kV per second. Hold the
voltage at this value for 1 minute and observe the current drawn by the interrupter.
Note: If the ammeter fluctuates violently as the voltage increases to AC22 kV, repeat the
voltage increase procedure two or three times. If the current still rises when the voltage is
increased, the vacuum level may be insufficient; replace the vacuum interrupter.
4. Decrease the voltage back to zero.
1 minute
22kV AC
(31kV DC)
CRITERIA:
1. If a current flow above 5 milliamperes is observed or
if breakdown occurs, one or more of the interrupters
has insufficient vacuum and must be replaced.
Voltage
Exception: If the current exceeds 5 milliamperes the
first time the voltage is brought up, reduce the
voltage to zero and increase it again. It may be
necessary to repeat this procedure a few times.
Zero
15 sec
15 sec
2. If the breaker fails to meet criteria 1, then repeat the
test on each pole separately to identify the damaged
interrupter or interrupters.
Time
Figure 34 Application of Test
Voltage for Vacuum Check
3. If the voltage can be held for 1 minute and the current flow does not exceed 5 milliamperes, the
interrupter has a sufficient vacuum level.
After the test is complete, discharge any residual static charge from the primary terminals of the circuit
breaker.
If a vacuum checker or AC hi-pot tester is not available, a DC hi potential test may be conducted. If a DC
test is conducted, the test voltage must be increased to 31kV DC. The test duration for DC tests and the
criteria for acceptance remain the same as for AC tests.
Do not use DC hi-pot testers which employ unfiltered half-wave rectifiers.
The peak voltages produced by these testers may exceed the recommended
value of 31kV. This can result in the production of harmful X-rays
and may invalidate the test results.
WARNING
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Figure 35 shows the relationship between the dielectric breakdown characteristics and the withstand
voltage between electrodes (for each vacuum interrupter) in the withstand voltage test.
Figure 35 Dielectric Breakdown Characteristics
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TOSHIBA
TOSHIBA INTERNATIONAL CORPORATION
INDUSTRIAL DIVISION
13131 W. Little York Road, Houston, TX 77041 U.S.A.
Tel: +713- 466-0277 US 1-800- 231-1412
Fax: (713) 466-8773
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