Toshiba HV6FS-MLD User Manual

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Document: GF07Z304 Rev. 2

INSTRUCTION MANUAL

INSTALLATION - OPERATION - MAINTENANCE

HV6FS-MLD Vacuum Circuit Breakers – Drawout Type

4.8 & 7.2kV Voltage Classes
(Fast Closing w/UV Release)

Issued: 10/2006

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INSTRUCTION MANUAL

For the Installation, Operation and Maintenance of

HV6FS-MLD Vacuum Circuit Breakers – Drawout Type

4.8 & 7.2kV Voltage Classes
(Fast Closing w/UV Release)

WARNING

To contact Toshiba, address all correspondence to:
Field Service Department

Toshiba International Corporation
13131 West Little York Road
Houston, Texas 77041 USA

or call:
[phone]

[phone]
[phone] (Canada)

Fax: [phone]
Please complete the following information for your records and retain with this manual:
Model: ___________________________________
Serial Number: _____________________________
Date of Installation: _________________________
Inspected by: ______________________________
Reference Number: _________________________

Never attempt to install, operate, maintain or dispose of this equipment until
you have first read and understood all of the relevant product warnings and
user directions that are contained in this Instruction Manual.

© TOSHIBA INTERNATIONAL CORPORATION, 2006

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SAFETY Page 1

IMPORTANT MESSAGES
Read this manual and follow its instructions. Signal words such as

DANGER, WARNING and CAUTION will be followed by important safety
information that must be carefully reviewed.

DANGER

WARNING

CAUTION

NOTE Gives you helpful information

Note: The contents of this manual will not become apart of or modify the warranty policy. The
terms of which are set forth at the end of this manual.

READ SAFETY SIGNS

To avoid injury, you must read and follow all safety signs.
Keep the safety signs visible and in good shape. Never remove or cover any safety

signs.

Indicates a situation that will result in death, serious injury, and severe
property damage if you do not follow instructions.

Means that you might be seriously injured or killed if you do not follow
instructions. Severe property damage might also occur.

Means that you might be injured if you do not follow instructions. Equipment
damage might also occur.

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Page 2 SAFETY

QUALIFIED OPERATORS ONLY

Only qualified persons are to install, operate, or service this equipment according to all
applicable codes and established safety practices.

A qualified person must:

1) Carefully read the entire instruction manual.

2) Be skilled in the installation, construction or operation of the equipment and
aware of the hazards involved.

3) Be trained and authorized to safely energize, de-energize, clear, ground,
lockout and tag circuits in accordance with established safety practices.

4) Be trained and authorized to perform the service, maintenance or repair of
this equipment.

5) Be trained in the proper care and use of protective equipment such as rubber
gloves, hard hat, safety glasses, face shield, flash clothing, etc. in
accordance with established practices.

6) Be trained in rendering first aid.

SAFETY CODES

Toshiba HV6FS vacuum circuit breakers are designed and built in accordance with JIS
C 4603-1990 and JEC-2300-1985. Installations must comply with all applicable state
and local codes, adhere to all applicable National Electric Code (NFPA 70) standards
and instructions provided in this manual.

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SAFETY Page 3

HAZARDOUS VOLTAGE will cause severe injury, death, fire, explosion and

DANGER

• Turn off and lock out Primary and Control Circuit Power before servicing.

• Keep all panels and covers securely in place.

• Never Defeat, Modify, or Bypass any Safety Interlocks

• Qualified Operators only

property damage.

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Page 4 TABLE OF CONTENTS

SAFETY....................................................................................................................................................1

INTRODUCTION ......................................................................................................................................6

GENERAL DESCRIPTION.......................................................................................................................7

Components..................................................................................................................................7

Safety Devices..............................................................................................................................8

Indicators and Controls.................................................................................................................8

RECEIVING, INSPECTION AND HANDLING........................................................................................10

Receiving and Unpacking ...........................................................................................................10

Acceptance Inspection................................................................................................................10

Handling and Moving ..................................................................................................................11

INSTALLATION......................................................................................................................................12

Rating Verification.......................................................................................................................12

Mounting the Circuit Breaker Cell ...............................................................................................12

Main Circuit Cable Connections..................................................................................................13

Ground Connections...................................................................................................................14

Control Circuit Connections ........................................................................................................15

Placing the Circuit Breaker in the Cell.........................................................................................16

PRE-ENERGIZATION CHECK ..............................................................................................................18

General .......................................................................................................................................18

Electrical Checks ........................................................................................................................18

OPERATION...........................................................................................................................................19

Moving Circuit Breaker From Disconnected to Connected Position ...........................................19

Moving the Circuit Breaker From Connected to Disconnected Position .....................................20

Manual Operation........................................................................................................................21

Electrical Operation & Undervoltage Trip....................................................................................22

Electrical Operation Flow Chart ..................................................................................................23

MAINTENANCE .....................................................................................................................................25

Maintenance Program.................................................................................................................25

Maintenance Record...................................................................................................................25

Servicing Equipment...................................................................................................................25

Inspection and Maintenance Types ............................................................................................26

Table 1. Tightening Torques......................................................................................................26

Table 2. Check Points for Periodic Inspection ...........................................................................27

Vacuum Check............................................................................................................................29

DISPOSAL..............................................................................................................................................31

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TABLE OF CONTENTS Page 5

STORAGE..............................................................................................................................................34

Storage........................................................................................................................................34

Inspection During Storage...........................................................................................................34

SPECIFICATIONS..................................................................................................................................35

Table 3. Ratings – Motor Operation HV6FS-MLD Type.............................................................35

WARRANTY AND LIMITATION OF LIABILITY.....................................................................................36

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Page 6 INTRODUCTION

It is the intent of this manual to provide a guide for safely installing, operating and maintaining Toshiba
vacuum circuit breakers. This manual consists of a section of general safety instructions and is marked
throughout with warning symbols. Read this manual thoroughly before installation, operation and
maintenance of this equipment.

This manual and all accompanying drawings should be considered a permanent part of the equipment.
They should be readily available for review and reference at all times. This manual is not intended to
cover all details, combinations, or variations of the equipment. Always refer to drawings accompanying
the equipment for additional details.

All safety warnings must be followed to ensure personal safety. General safety instructions are
found on pages 1 through 3. Read and save these instructions for future reference.

Follow all precautions to attain proper equipment performance and longevity.
Dimensions shown in the manual are in metric and/or their English equivalent.

This manual is divided into major sections of interest, as follows:
GENERAL DESCRIPTION – Provides a description of the equipment, information on major

components and how they function, plus rating information.
RECEIVING, INSPECTION AND HANDLING – Describes procedures for receiving, unpacking,

inspecting, handling, lifting and moving the circuit breaker.
INSTALLATION – Provides information on installing the circuit breaker in the switchgear cell along with

breaker racking procedures.

PRE-ENERGIZATION CHECK – Provides a checklist for preparing the equipment for energization.
OPERATION – Provides information on manual and electrical operation of the circuit breaker, circuit

diagrams, operating sequence description and operation of circuit breaker optional accessories.
MAINTENANCE – Lists the basic maintenance procedures for this equipment necessary for safe and

reliable operation.

DISPOSAL – Lists procedures for the safe disposal of the equipment when the service life has expired.
STORAGE – Provides guidelines for storing new equipment for an extended period of time.
SPECIFICATIONS – Covers ratings and other specifications of the circuit breaker.
WARRANTY AND LIMITATION OF LIABILITY – Details Toshiba International Corporation’s standard

warranty terms.

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GENERAL DESCRIPTION Page 7

The Toshiba HV6FS-MLD vacuum circuit
breaker described in this manual is suitable for
use on systems of 4.8kV and 7.2kV voltage
classes that require interrupting ratings of 16kA
and 14kA respectively and a continuous current
rating of 630A. The circuit breaker is intended
for use in limited applications requiring small
physical size and low maintenance.

This breaker is designed for drawout operation
using the H6A-HLS cell. The H6A-HLS cell
allows the circuit breaker to be withdrawn for
service without requiring manual disconnection
of line, load and control wiring.

The circuit breaker is a motor-operated type.
The motor is used to charge the closing springs
and to close the breaker upon command. The
circuit breaker can be tripped electrically.

Arc interruption is accomplished inside sealed
vacuum interrupters mounted on track-resistant
insulators. Vacuum interrupters use low-surge
contact materials that exhibit low current
chopping levels reducing switching overvoltages.

Fig. 1 and Fig. 2 illustrate and identify the major
components of the circuit breaker and cell.

COMPONENTS LEGEND:
Circuit Breaker (Fig. 1):

1) Manual charging handle

2) Manual trip lever

3) On-Off indicator

4) Spring charge indicator

5) Operations counter

6) Secondary control circuit plug

7) Interlock release lever

8) Primary stab fingers

9) Manual close lever (Not shown in Figure)
Cell (Fig. 2):

1) Breaker guide rails

2) Main terminal shutter

3) Breaker holding pin

Fig. 1 Type HV6FS-MLD Circuit Breaker

Fig. 2 Type H6A-HLS Circuit Breaker Cell

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Page 8 GENERAL DESCRIPTION

SAFETY DEVICES

Safety interlocks and guards are provided as an
integral part of the equipment design. These
devices are provided for safety to the operator.

DANGER

WARNING

INTERLOCK RELEASE LEVER
The interlock release lever on the front of the

circuit breaker (Fig. 3) prevents moving the
circuit breaker to or from the CONNECTED
position while it is ON (main contacts closed).

If the circuit breaker is ON, the interlock release
lever cannot be raised, preventing movement of
the breaker in or out of the cell. If the lever is
raised when the circuit breaker is OFF, an
interlock prevents the circuit breaker from closing
until the lever is returned to its lowered position.

DANGER

Never defeat, modify or
bypass any safety devices,
interlocks or operating
mechanism. This would
make the equipment
unsafe. Fire, explosion,
severe injury, death and
property damage could
occur.

Do not operate this
equipment unless all
covers and panels are in
place.

Hazard of fire, explosion,
severe injury, death and
property damage.

Never attempt to move a
circuit breaker that is ON
(main contacts closed) into
or out of the CONNECTED
position.

Never attempt to forcibly
override the interlock
release lever.

Fig. 3 Interlock Release Lever

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GENERAL DESCRIPTION Page 9

INDICATORS AND CONTROLS (Fig. 4)

The following front panel indicators and controls
are provided:

1) On-Off Indicator - Indicates if the circuit
breaker is OFF (Green) or ON (Red). When
the indicator reads OFF, the main contacts of
the circuit breaker are open. When the
indication is ON, the main contacts are
closed.

2) Closing Spring Status Indicator - Indicates if
the closing springs are CHARGED (Yellow)
or DISCHARGED (White).

3) Manual Charging Handle – Turn the handle
clockwise 3 to 5 times will charge the closing
spring. (Closing Spring Status Indicator
changes to CHARGED, Yellow) When the
handle is released, it returns to its normal
position, and do not attempt to turn again.

4) Manual Close Lever (Green) - Pushing the
lever in the direction of the arrow closes the
circuit breaker (On-Off indicator changes to
ON).

5) Manual Trip Lever (Red) – Pushing the lever
in the direction of the arrow trips the circuit
breaker (On-Off indicator changes to OFF).

6) Operations Counter - Indicates the total
accumulated number of times the circuit
breaker has been closed.

1

3

4

2
6

5

Fig. 4 Indicators and Controls

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Page 10 RECEIVING, INSPECTION AND HANDLING

RECEIVING AND UNPACKING

The circuit breaker units are subjected to factory
production testing prior to being packed and
shipped.

ACCEPTANCE INSPECTION
Confirm that the circuit breaker and cell units are

complete, correct as specified and undamaged
from shipment and handling.

Upon receipt of the equipment, do the following:

1) Make an immediate inspection for damage
that might have occurred during shipment. If
damage is discovered, it should be noted
with the carrier prior to accepting the
shipment, if possible.

2) Carefully unpack the equipment sufficiently to
check for missing parts or concealed
damage.

3) Check for the presence of accessories that
are shipped with the circuit breaker and cell:

- Charging Handle (Fig. 5)

- B9 Grease (Fig. 6)

- Control Wire Harness (Fig. 7)

3) Keep the circuit breaker and cell upright.

CAUTION

Never lay the circuit
breaker or cell on its side
or upside down. This may
cause damage.

4) File a claim with the carrier for any damaged
or missing items and immediately notify the
nearest Toshiba representative.

WARNING

Do not install or energize
equipment that has been
damaged. Damaged
equipment can fail during
operation, resulting in fire
and explosion.

Fig. 5 Charging Handle

Fig. 6 B9 Grease

Fig. 7 Control Wire Harness

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RECEIVING, INSPECTION AND HANDLING Page 11

HANDLING AND MOVING

When handling and moving the circuit breaker
and cell, the techniques shown in this section
may be used.

Care and caution should be used when handling
the circuit breaker and cell units to avoid damage
to the equipment and personal injury. Always
keep the equipment in a generally upright
position.

Refer to Fig. 8 and Fig. 9 for the correct
methods of lifting and moving the circuit breaker
and cell.

When lifting the circuit breaker, attach a wire
sling to the bolts on the upper left and right
corners of the housing as shown in Fig. 8 . For
the cell, the sling is attached to the holes located
in the upper left and right rear of the support
frame as shown in Fig. 9.

Always use lifting equipment suitable for the
weight of the units. The capability of the lifting
equipment to handle the size and weight of the
circuit breaker and cell should be confirmed prior
to lifting.

Fig. 8 Lifting Method for Circuit Breaker

Fig. 9 Lifting Method for Cell

5

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Page 12 INSTALLATION

WARNING

Do not install this
equipment in areas where
unusual service conditions
exist. Using this equipment
in other than usual service
conditions can result in
equipment failure.

Toshiba HV6FS-MLD circuit breakers are
intended for use in usual service conditions as
defined in IEEE C37.20.2. The temperature of
the cooling air (ambient air temperature)
surrounding the breaker should be between the
limits of -5°C (23°F) and +40°C (104°F). The
altitude of the equipment installation should not
exceed 3300 ft (1000 m).

In particular, avoid the following installation
conditions:

- Excessive dust

- Corrosive gases

- Extreme variations in temperature

- Very high or low humidity

- Vibrations

- Inclined locations

If there is a chance that condensation can occur

at the installation location, a space heater should
be installed inside the circuit breaker enclosure.

NOTE: Temperature, altitude or other

conditions outside of the usual limits
may require derating or other special
equipment. Contact your nearest
Toshiba representative for additional
information.

RATING VERIFICATION
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. Fig. 10
illustrates a typical circuit breaker nameplate.

DANGER

Do not exceed the ratings
specified on the circuit
breaker nameplate or
system accessories.
Underrated equipment can
fail during operation
causing fire, explosion,
severe injury, death, and
property damage.

TOSHIBA

VACUUM CIRCUIT BREAKER

TYPE

RATED VOLTAGE
FREQUENCY
CONTINUOUS AMPS
IMPULSE LEVEL
DIELECTRIC
WEIGHT

PARTS & WIRING, SEE INSTRUCTIONS
SER. No.

Fig. 10 Typical Circuit Breaker Nameplate

03700235 7/03

7.2/4.8 kV, RMS

38 84

HV6FS-

50/60 Hz

630A, RMS

60 kV, CREST

22 kV AC RMS

kg

lbs

TOSHIBA INTERNATIONAL CORPORATION

HOUSTON, TEXAS U.S.A.

MLD-VVU

SHORT CKT. AMPS
INTERRUPTING TIME
CLOSE VOLTS
SHUNT TRIP VOLTS
UV TRIP VOLTS

MFG. STANDARD

GF07Z304

MFG. DATE

14/16 kA, RMS

3 CYCLES

125

VDC

12

VDC

120

VAC

JIS C 4603-1990

JEC-2300-1985

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INSTALLATION Page 13

MOUNTING THE CIRCUIT BREAKER CELL

The circuit breaker cell is designed to mount to
the floor or shelf of the installation compartment.
The floor or shelf to which the cell is mounted
should be flat and level within ± 0.5 mm (± 0.02
in.). If there are any noticeable gaps between
the cell base and the mounting surface, fill them
in using flat washers as spacers.

Fasten the cell using four (4) M8 hex head bolts
(Fig. 11). The tightening torque should be 120­150 kgf-cm (9-11 ft-lb).

MAIN CIRCUIT CABLE CONNECTIONS

Route cables that connect to the circuit breaker
cell to avoid interference with sharp edges and
moving parts. Observe minimum bending radius
for the type of cable used.

Power cables should be braced and/or laced to
withstand short-circuit forces wherever such
cables are unsupported. Power cables should
be adequately sized to carry the maximum
continuous current in accordance with NEC
requirements and should have an adequate
voltage rating. Cables should be dressed and
terminated as appropriate to the voltage class
and cable manufacturer’s recommendations.
When terminating shielded cables, use
termination kits appropriate for the system
voltage to taper the insulation and reduce
electrical stress. Follow the manufacturer’s
installation instructions provided with the
termination kit.

Fasten the cables to the main circuit terminals
(Fasten the cables to the main circuit terminals
Fig. 12). Use 35 mm Class 8.8 M10 or M12
hex head bolts, 2 flat washers, a lock washer
and a nut. While securely preventing the nut
from rotating with a wrench, torque the bolt to
250-315 kgf-cm (18-23 ft-lb) for M10 bolts or
450-565 kgf-cm (32-41 ft-lb) for M12 bolts.

CAUTION

Fig. 11 Fastening Cell to Compartment Floor
or Shelf

Fig. 12 Fastening Cables to Main Circuit
Terminals

Use two wrenches to torque
the connection to prevent
applying excessive force to
the terminal that can
damage the frame.

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Page 14 INSTALLATION

GROUND CONNECTIONS

The circuit breaker cell must be grounded in
accordance with the requirements of the National
Electrical Code, Article 250 or applicable local
standards.

WARNING

Proper grounding
connections must be made
to the circuit breaker cell
before incoming power is
applied.

It is very important that the circuit breaker and its
enclosure be adequately grounded to protect the
operator from injury in the event of short circuits
or other abnormal occurrences and to ensure
that the metal parts of the equipment, other than
live parts, remain at ground potential.

The ground terminal is located on the left rear of
the cell frame as shown in Fig. 13. To make the
ground connection, first remove the fastening M8
hex head bolt and crimp-on terminal (provided
with the cell) and crimp the terminal to the end of
the ground wire. Then, reattach the terminal
(Fig. 14) using the same bolt previously removed
and torque to 120-150 kgf-cm (9-11 ft-lb).

Fig. 13 Location of Ground Terminal

Fig. 14 Installation of Ground Wire

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INSTALLATION Page 15

CONTROL CIRCUIT CONNECTIONS

Control circuit wiring is connected to the circuit
breaker by means of a control plug (green
color) located on the breaker front panel (Fig.

15). A control wire harness (Fi g . 16) is furnished

with the circuit breaker for making this
connection.

Using the supplied harness, connect control
wiring in accordance with the appropriate wiring
diagram shown in Fig. 31 in the OPERATION
section of this manual.

Fig. 15 Control Circuit Plug

Fig. 16 Control Wire Harness

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Page 16 INSTALLATION

PLACING THE CIRCUIT BREAKER IN THE
CELL

DANGER

Hazard of fire, explosion,
severe injury, death and
property damage. Circuit
breaker must be OFF
before installation or
removal from cell.

WARNING

Circuit breaker contains
powerful springs.
Discharge springs
completely before
installation or servicing.

Before attempting to install the circuit breaker in
the cell, verify that the continuous current,
voltage and interrupting ratings are correct for
the power system.

Open the B9 grease provided and apply a
coating to the ends of the six (6) primary stab
fingers (Fig. 17).

A portable lifter should be used for the insertion
or removal of the circuit breaker if the
compartment is above floor level. Place the
breaker on the lifter and bring it to the same
level as the cell. Align the hole on the lifter tab
with the welded nut on the cell base and
remove the holding pin from the right hand side
of the cell base. (Fig. 18).

Fig. 17 Apply B9 Grease to Stab Fingers

Fig. 18 Lifter Positioned for Insertion of
Breaker into Cell

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INSTALLATION Page 17

PLACING THE CIRCUIT BREAKER IN THE
CELL (cont’d)

Grasp the handles on the breaker with both
hands and, while lifting the interlock release
lever with the left hand, insert the breaker into
the cell ( Fig. 19.

Continue to roll the breaker into the cell until the
arrow on the front cover indicates the
DISCONNECTED position (Fig. 20), then
release the lever. Check to make sure the
interlock release lever has returned to its
original lowered position.

Insert the breaker holding pin.

CAUTION

To avoid damage to the
equipment and possible
injury, do not remove the
holding pin unless the
circuit breaker is being
removed from the cell.

Fig. 19 Inserting Breaker into Cell

Fig. 20 Breaker at DISCONNECTED Position

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Page 18 PRE-ENERGIZATION CHECK

GENERAL

BEFORE ENERGIZING THE CIRCUIT
BREAKER for the first time, follow the procedure

below to verify that the equipment is properly
installed and functional.

DANGER

WARNING

WARNING

WARNING

WARNING

All blocks or other temporary braces used for

shipment must be removed.

Before closing the enclosure, all metal chips,

scrap wire and other debris left over from
installation must be cleaned out.

Cover all unused openings. Install all panels,

guards and covers.

A supply of spare parts should be

established.

Instruction manuals and diagrams should be

collected and filed.

Hazardous Voltage. Turn off
and lock out all primary and
control circuit power
sources prior to performing
this pre-energization check.

Do not operate this
equipment until a complete
safety inspection has been
made.

Do not energize damaged
equipment that has not
been repaired or verified.

Do not remove, cover or
destroy any safety signs.

Do not operate this
equipment until all panels
and covers have been
installed.

ELECTRICAL CHECKS

WARNING

An electrical insulation resistance test should

be performed to verify that the circuit breaker
and associated field wiring are free from
short circuits and grounds. Refer to the
MAINTENANCE Section of this manual for
additional information.

WARNING

The circuit breaker must be set to the OFF
position before energizing incoming power.

Electrical shock hazard.
Do not touch energized
components during a test
using auxiliary power.

Hazardous voltages are
present during dielectric
testing which can result in
serious injury or death.
High potential tests should
be performed only by
qualified personnel.

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OPERATION Page 19

MOVING THE CIRCUIT BREAKER FROM
THE DISCONNECTED TO THE CONNECTED
POSITION

DANGER

Hazard of fire, explosion,
severe injury, death and
property damage. Circuit
breaker must be OFF before
moving to or from the
CONNECTED position.

WARNING

Do not move the circuit
breaker to the CONNECTED
position without first
connecting the secondary
control circuit plug. Do not
disconnect the plug while
the breaker is in the
CONNECTED position.

Any time the circuit breaker is connected to main
power, it is necessary that the control circuit plug
be connected to ensure that the tripping circuit is
completed.

Fig. 21 Control Circuit Plug Connected to
Breaker

TO MOVE THE CIRCUIT BREAKER TO THE
CONNECTED POSITION:

1. Connect the control circuit plug to the
breaker (Fig. 21).

2. Check to be sure that the On-Off Indicator
reads OFF (Green). Push the manual trip
lever in the direction of the arrow if
necessary to open the circuit breaker. The
interlock release lever cannot be raised
unless the circuit breaker is OFF.

3. Grasp the handles on the breaker with both
hands and, while lifting the interlock
release lever with the left hand, push the
breaker into the cell until the arrow on the
front cover indicates the CONNECTED
position has been reached (Fig. 22), then

Fig. 22 Breaker at CONNECTED Position

release the lever. Check to make sure the
interlock release lever has returned to its
original lowered position.

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Page 20 OPERATION

MOVING THE CIRCUIT BREAKER FROM
THE CONNECTED TO THE DISCONNECTED
POSITION

DANGER

TO MOVE THE CIRCUIT BREAKER TO THE
DISCONNECTED POSITION:

1. Check to be sure that the On-Off Indicator
reads OFF (Green). Push the manual trip
lever in the direction of the arrow if
necessary to open the circuit breaker. The
interlock release lever cannot be raised
unless the circuit breaker is OFF.

2. Grasp the handles on the breaker with both
hands and, while lifting the interlock
release lever with the left hand, pull the
breaker out of the cell until the arrow on the
front cover indicates the DISCONNECTED
position has been reached (Fig. 23), then
release the lever. Check to make sure the
interlock release lever has returned to its
original lowered position.

3. Optionally, disconnect the control circuit plug
from the breaker (Fig. 24). The plug may
remain connected if desired in order to
perform tests on the control circuit with main
power removed from the circuit breaker. If
the plug is disconnected, it must be
reconnected before the circuit breaker is
returned to the CONNECTED position.

Hazard of fire, explosion,
severe injury, death and
property damage. Circuit
breaker must be OFF
before moving to or from
the CONNECTED position.

Fig. 23 Breaker at DISCONNECTED Position

Fig. 24 Disconnect Control Circuit Plug

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PRE-ENERGIZATION CHECK Page 21

MANUAL OPERATION

WARNING

CAUTION

MANUAL CLOSING:

1. Check to make sure that the On-Off
indicator shows OFF (green).

2. Attach the charging handle to the breaker if it
is not already attached.

3. If the closing spring status indicator shows
DISCHARGED (white):

Turn the closing handle clockwise 3 to 5
times to charge the closing spring (Fig. 25).
(Closing Spring Status Indicator changes to
CHARGED, Yellow) When the handle is
released, it returns to its normal position, and
do not attempt to turn again. (Fig. 26)

If the closing spring status indicator shows
CHARGED (yellow):

Do not attempt to turn handle.
Pushing the Green lever in the direction of

the arrow closes the circuit breaker (On-Off
indicator changes to ON)

Powerful springs. Do not
place your hands or any
part of your body inside
the circuit breaker while
the indicators show
CHARGED (yellow) or ON
(red).

To avoid damaging the
mechanism, do not close
the circuit breaker when
the On-Off Indicator shows
ON (red).

Fig. 25 Preparing to Manually Close Breaker

Fig. 26 Manually Charging Breaker

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Page 22 OPERATION

MANUAL OPENING:

1. Push the trip lever in the direction of the
arrow (Fig. 27).

2. The On-Off indicator changes to OFF
(green).

ELECTRICAL OPERATION
The flow chart shown in Fig. 30 illustrates the

sequence of electrical operation.
Refer to the schematic shown in Fig. 31 for

determining external control circuit connections
to the circuit breaker.

UNDERVOLTAGE TRIP
All HV6FS drawout circuit 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 relay UV.

When the circuit breakers are shipped, the
undervoltage trip device is defeated by a factory­installed plug (Fig. 28). If this plug is left in
place, the circuit breaker will operate normally
without power applied to relay UV. Removing
this plug (Fig. 29) activates the undervoltage trip
function.

Fig. 27 Manually Opening Breaker

Fig. 28 Plug Installed in UV Trip Device

Fig. 29 Removing Plug From UV Trip Device

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OPERATION Page 23

Circuit Breaker Open

Control Power Applied

Motor Begins Operating

Closing Springs Begin Charging

Closing Springs Charged

Motor Stops

Closing Signal Given

Close Coil Energized

Circuit Breaker Closes

Auxiliary Relay Closes

Anti-Pumping Circuit Completed

Opening Signal Given

- - - - Spring Status Indicator Changes to Yellow

- - - - Standby for Close Operation

- - - - Spring Status Indicator Changes to White
and On-Off Status Changes to ON

- - - - Next Close Operation is Not Possible
Unless Close Signal is Canceled

Trip Coil Energized

Circuit Breaker Opens

Fig. 30 Electrical Operation Flow Chart

- - - - On-Off Status Indicator Changes to OFF

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Page 24 MAINTENANCE

17 16 15 14 13 12 11 10

Green

PR3 NT3 H A1 A2 B1 B2

C4 C04 K N2 A01 A02 B01 B02

987654321

Fig. 31 125 VDC Control Circuit Schematic

SYMBOL DESCRIPTION

M Motor
TC Voltage Trip Coil
CC Close coil
UV Undervoltage Trip Coil

a1 to a3 Auxiliary Contacts (N.O.)
b1 to b3 Auxiliary Contacts (N.C.)

X Control Relay
X-a Control Relay Contact (N.O.)
X-b Control Relay Contact (N.C.)

Y Auxiliary Relay
Y-b Auxiliary Relay Contact (N.C.)

LS Limit Switch

R Resistor
D Diode

C Capacitor
RL Red Lamp
GL Green Lamp

Fig. 32 Legend for Schematic

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MAINTENANCE Page 25

MAINTENANCE PROGRAM

In order to ensure continued reliable and safe
operation of the equipment, a program of
periodic maintenance must be established.
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.

DANGER

WARNING

WARNING

NOTE: Refer to the SAFETY section of this

manual for important information.

Contact with energized
components can cause
severe injury, death and
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.

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
information on:

1) Items inspected

2) Reports of any testing

3) Equipment condition

4) Corrective actions or adjustments

5) Date of work

6) Comments
The degree of detail of the record will depend

somewhat on the operating conditions.
SERVICING EQUIPMENT
For your safety, turn off and lock out main and

control circuit power before servicing the circuit
breaker. Certain minimum safety procedures
must be followed:

1) Only qualified personnel should attempt
this service.

2) Never perform service on or next to
exposed components energized with line
voltage.

WARNING

Failure to adhere to these
safety procedures can
result in severe injury,
death and property
damage.

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Page 26 MAINTENANCE

RECOMMENDED INSPECTION AND
MAINTENANCE TYPES

NOTE: Refer to the SAFETY section of this

manual for important information.

A. Acceptance Inspection
This inspection confirms that the circuit

breaker unit is complete, correct as specified,
and undamaged from shipment. The
procedure for this inspection is outlined in the
RECEIVING, INSPECTION AND HANDLING
section of this manual.

B. Patrol Inspection
Inspection is made of the condition of the

circuit breaker while it is energized. Check
that no unusual sounds or smells exist
externally.

Inspection Frequency:
C. Periodic Inspection
Inspection is performed with the circuit breaker

de-energized. The lubrication of sliding and

rotating parts is checked and the mechanism

is lubricated if needed.

Inspection Frequency:

or every 3000 operations (normal). Once

every 6 years (detailed).

Refer to Table 2 for the schedule of Periodic

Inspections.
D. Unscheduled Inspection

Inspections are implemented as required.

Inspection Frequency:
NOTE: The inspection frequency and points

to be inspected may vary from the
above recommendations depending
on the status of use, frequency of
switching, amount of current
interrupted and other factors.

Once every 6 months

Once every 1-3 years

As needed

Table 1 Tightening Torques

Screw

Nominal

Dia.

M4 15-20 kgf-cm

13-17 in-lb

M5 30-40 kgf-cm

26-34 in-lb

M6 50-65 kgf-cm

43-56 in-lb

M8 120-150 kgf-cm

9-11 ft-lb

M10 250-315 kgf-cm

18-23 ft-lb

M12 450-565 kgf-cm

32-41 ft-lb

Tightening Torque

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MAINTENANCE Page 27

Table 2 Check Points for Periodic Inspection

Check Point Check Item Check Method Criteria Disposition

Operating
Mechanism

Dust or foreign

Indicator

Warpage Visual

Smooth

Loose bolts,
nuts or screws

matter inside

operation

operation

Tighten using
screwdriver or
wrench.

Visual
inspection.

Visual
inspection.

inspection.

Manual
operation.
Visual
inspection or
touch. Check
lubrication.

Make sure all bolts, nuts
and screws are tight.

The circuit breaker
should be clean and
contain no foreign matter.

Make sure the number of
operations is correctly
displayed.

There should be no
warpage or missing
parts.

Make sure moving parts
operate smoothly.

Tighten if loose.
See

Table 1 for
tightening torques.

Wipe with a clean
dry cloth.

Check the cause
and repair.

Check the cause
and repair.

Apply a small
amount of
lubrication.

Main Circuit Discoloration

due to heat
from conducting
parts

Loose bolts,

nuts or screws

Dust on surface

of vacuum
interrupter

Insulator Dust, foreign

matter or
damage

Visual
inspection.

Tighten using a
wrench.

Visual
inspection.

Visual
inspection.

Make sure there is no
discoloration.

Make sure all bolts, nuts
and screws are tight.

Make sure there is no
dust on the surface.

Make sure there is no
dust, foreign matter or
breakage.

Check the cause
and repair. Tighten
connections to circuit
breaker. See

Table 1 for
tightening torques.
See

Table 1 for
tightening torques.

Wipe with a clean,
dry cloth.

Wipe with a clean,
dry cloth. If
damaged, contact
Toshiba.

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Page 28 MAINTENANCE

Table 2. Check Points for Inspection (cont’d)

Check Point Check Item Check Method Criteria What to do

Auxiliary
Switch

Case/contacts Visual

Control
Circuits

Terminals loose

Terminals loose
or disconnected

Smooth
movement of
motor charging
mechanism

or disconnected

Visual
inspection.
Tighten using a
screwdriver.

inspection.
Energize the

control circuit.

Visual
inspection.
Tighten using a
screwdriver.

Make sure terminals are
not loose or disconnected.

Make sure there is no
damage or warping.

Breaker (motor-operated
type) should charge
quickly and smoothly.

Make sure terminals are
not loose or disconnected.

Repair if
disconnected.
Tighten if loose.
See

Table 1 for
tightening torques.

Replace if damaged
or warped.

If the circuit fails to
operate, check the
cause and repair.

Repair if
disconnected.
Tighten if loose.
See

Table 1 for
tightening torques.

Insulation
Resistance
Measure­ment

Measure

Measure control

Measure main
circuit to ground

between main
circuit terminals

circuits to
ground

Megger test at
1000V.

Megger test at
1000V.

Megger test at
500V.

Resistance should be
500MΩ or greater.

Resistance should be
100MΩ or greater.

Resistance should be
2MΩ or greater.

If the insulation
resistance is low,
wipe off the vacuum
interrupter and other
insulation surfaces
with a clean dry
cloth and then
repeat the test.

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MAINTENANCE Page 29

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:
Toshiba offers a compact vacuum checker (Type

CI35-1D) 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.

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. X­radiation 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, however, 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.

WARNING

Radiation exposure hazard.
X-rays may cause illness or
injury. Stay at least 1 meter
(3.3 ft) away from the circuit
breaker during the vacuum
check test .

WARNING

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.

4. Decrease the voltage back to zero.

Fig. 33 Toshiba Portable Vacuum Checker

Hazardous voltages are
present during dielectric
testing which can result in
severe injury or death.
Only qualified personnel
should conduct this testing.

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Page 30 MAINTENANCE

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.

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.

2. If the breaker fails to meet criteria 1, then
repeat the test on each pole separately to
identify the damaged interrupter or
interrupters.

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.

WARNING

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 X­rays and may invalidate the
test results.

1 minute
22kV AC
(31kV DC)

Voltage

Zero
15 sec 15 sec

Time

Fig. 34 Application of Test Voltage for
Vacuum Check

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DISPOSAL Page 31

DISPOSAL

Contact your state environmental agency for
details on disposal of electrical components and
packaging in your particular area.

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STORAGE Page 32

STORAGE

If the circuit breaker is to be stored for any length
of time prior to installation, the following
precautions should be taken:

1) The original packing should be restored, if
possible.

2) Do not subject the equipment to moisture or
sun rays. Store in cool, clean, and dry
location.

3) Place a dust cover over the circuit breaker
packaging to protect against dirt and
moisture.

4) Store in an upright position.

INSPECTION DURING STORAGE

Routine scheduled inspection is necessary if
storage is for an extended period. The unit
should be checked for condensation, moisture,
corrosion, and vermin.

Prior to installation, the circuit breaker should be
carefully examined for evidence of physical
damage, corrosion, or other deterioration. Refer
to the PRE-ENERGIZATION Section of this
manual.

The MAINTENANCE section of this manual
describes various types of inspections
recommended for this circuit breaker during the
operation period.

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SPECIFICATIONS Page 33

Table 3 Circuit Breaker Ratings – Motor Stored Energy Operation HV6FS-MLD Type

Rated Voltage kV, rms 7.2 4.8
AC Withstand Voltage kV, rms 22 – 1 Min.
Basic Impulse Level kV 60
Maximum Continuous Current A, rms 630
Rated Frequency Hz 50/60
Rated Interrupting Current (0.15 P.F.) kA (Sym.), rms 14 16
Rated Making Current kA (Peak) 31.5kA
Rated Short-Time Current (2 sec) kA, rms 12.5
Rated Interrupting Time (60Hz Basis) cycles 3
Opening Time ms 20 (Typical)
Closing Time ms 30
Charging Time sec 1.5 - 3
Rated Control Voltage (Closing/Charging) V DC 125
Rated Control Voltage (Opening) V DC 30, 125
Rated Control Voltage (Undervoltage Trip) V AC 120
Operating Duty O - 1 min - CO - 3 min - CO
Auxiliary Contacts 2 N.O. - 2 N.C.
Weight kg (lb.) 38 (84)

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Page 34 WARRANTY AND LIMITATION OF LIABILITY

Toshiba International Corporation ("Company") warrants that all equipment and parts described herein will be free
from defects in materials and workmanship. THIS WARRANTY WILL EXPIRE EIGHTEEN (18) MONTHS AFTER
THE DATE ON WHICH SUCH EQUIPMENT AND PARTS (EXCLUDING REPAIRED OR REPLACEMENT
EQUIPMENT AND PARTS FURNISHED PURSUANT TO THIS WARRANTY) ARE SHIPPED BY THE COMPANY
TO THE INITIAL PURCHASER OR TWELVE (12) MONTHS AFTER SUCH EQUIPMENT AND PARTS
(EXCLUDING REPAIRED OR REPLACEMENT EQUIPMENT AND PARTS FURNISHED PURSUANT TO THIS
WARRANTY) ARE FIRST PLACED IN OPERATION, WHICHEVER PERIOD FIRST EXPIRES.

The Company will, at its option, repair or replace such equipment or part which is defective under the terms of the
foregoing warranty, free of charge; provided
defect, and (2) furnishes the Company satisfactory proof thereof, and (3) establishes that the equipment or part has
been properly installed, maintained and operated within the limits of rated capacity and normal usage and in
accordance with this manual, and (4) if requested by the Company, returns the defective equipment or part to the
Company and pays all expenses incurred in connection with such return. The repaired or replacement equipment or
part will be delivered, free of charge, to the purchaser F.O.B. the Company's warehouse or, at the Company's option,
F.O.B. a Company authorized service shop, not loaded on truck or other carrier. The purchaser will pay the costs
applicable to the equipment or part following such delivery, including, without limitation, all handling, transportation,
assembly, insurance, testing and inspection charges.

THE FOREGOING OBLIGATION TO REPAIR OR REPLACE EQUIPMENT PARTS SHALL BE THE SOLE AND
EXCLUSIVE REMEDY OF THE PURCHASER, ITS CUSTOMERS AND USERS OF THE EQUIPMENT AND
PARTS FOR BREACH OF THE FOREGOING WARRANTY. THE COMPANY WILL HAVE NO OBLIGATIONS TO
DISASSEMBLE ANY EQUIPMENT OR PART WHICH IS DEFECTIVE WITHIN THE TERMS OF THE ABOVE
WARRANTY OR TO INSTALL ANY REPAIRED OR REPLACEMENT PART OR EQUIPMENT OR TO PAY ANY
COSTS INCURRED IN CONNECTION WITH ANY SUCH DISASSEMBLY OR INSTALLATION. THE COMPANY,
TOSHIBA CORPORATION AND THEIR SUPPLIERS AND SUBCONTRACTORS HEREBY DISCLAIM ALL
OTHER EXPRESS, STATUTORY AND IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, ALL
EQUIPMENT AND PARTS FURNISHED PURSUANT TO THE FOREGOING WARRANTY AND ALL IMPLIED
WARRANTIES OF MERCHANTABILITY.

The total liability of the Company, Toshiba Corporation and their suppliers and subcontractors for any loss, damage
or claim, whether in contact, tort (including negligence and liability without fault), or otherwise, arising out of,
connected with or resulting from the equipment and parts described in this manual or the performance or breach of
any contract for the sale or supply of such equipment and parts, or from the design, manufacture, sale, delivery,
resale, installation, technical direction or supervision of installation, inspection, testing, repair, replacement,
operation, maintenance or use of any such equipment or part or any service relating thereto furnished by the
Company shall not in any event exceed the price allocable to the equipment, part or service which gives claim, loss
or damage. In no event, whether as a breach of contract or warranty, alleged negligence, liability without fault, or
otherwise, shall the Company, Toshiba Corporation or their suppliers or subcontractors be liable for special or
consequential damages, including, without limitation, loss or profits or revenue, loss of equipment described herein
or any associated equipment, cost of capital, cost of substitute equipment or parts, facilities or services, down-time
costs, labor costs or claims of customers of the purchaser for such damages.

the purchaser (1) promptly notifies the Company in writing of such