nbs Citadel 2.0 Series User manual

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Installation, operations and maintenance manual
15kV-63kA-Draw-out
Citadel®Vacuum Breaker

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15kV-63kA-4000A
Citadel®Fixed Mounted
Vacuum Breaker

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15kV-63kA-4000A
Citadel®Draw-Out
Vacuum Breaker
and Cell

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Narrow Fixed and Draw-Out VCB Elements
Voltage
Class CTDL Model # - kA FX|DO Available Amperage
Width
Fixed
Element
Width
Draw-Out
Element
5 kV 50 -CTDL-31.5 - FX|DO 1200-2000 19.6” 22.125”
5 kV 50 -CTDL-40.0 - FX|DO 1200-2000 19.6” 22.125”
7.5kV 75 -CTDL-40.0 - FX|DO 1200-2000 19.6” 22.125”
15 kV 150-CTDL-20.0 - FX|DO 1200-2000 19.6” 22.125”
15 kV 150-CTDL-31.5 - FX|DO 1200-2000 19.6” 22.125”
15 kV 150-CTDL-40.0 - FX|DO 1200-2000 19.6” 22.125”
• Numerical value at end of CTDL Model # reference kA value
26” wide Switchgear
Regular Fixed and Draw-Out VCB Elements
Voltage
Class CTDL Model # FX|DO Available Amperage
Width
Fixed
Element
Width
Draw-Out
Element
5 kV 50 -CTDL-50.0 - FX|DO 1200-2000-3000 28.375 32.313
5 kV 50 -CTDL-63.0 - FX|DO 1200-2000-3000 28.375 32.313
5 kV 50 -CTDL-63.0 - FX|DO 4000 28.375 32.313
7.5kV 75 -CTDL-40.0 - FX|DO 1200-2000-3000 28.375 32.313
15 kV 150-CTDL-50.0 - FX|DO 1200-2000-3000 28.375 32.313
15 kV 150-CTDL-63.0 - FX|DO 1200-2000-3000 28.375 32.313
15 kV 150-CTDL-63.0 - FX|DO 4000 28.375 32.313
50kA + 63kA rating is 36 inches wide switchgear
3000 | 4000 Amp - 36 inches wide switchgear
36” wide Switchgear
Citadel® Available Ratings

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This instruction manual applies to xed mounted and draw out
Citadel vacuum circuit breaker elements regarding installation and
maintenance procedures.
Installing and / or maintaining these products in an improper manner
may result in serious injury, property damage, or death. Therefore
this instruction manual must be read and understood in all aspects of
unpacking, assembly, operation, and maintenance of the breaker, and
its associated assembly.
Medium Voltage circuit breakers and switchgear are inherently dangerous and
potentially deadly.
Large mechanical forces are stored in; and discharged by the mechanism.
Operating and control voltages can severely burn, ash, damage and kill.
Medium Voltage circuit breakers and some switchgear component are heavy and can
be unwieldy. Items of these sizes and weight can cause serious injury and death if
moving / falling and striking an individual.
Damage and Death or serious injury can be the results of untrained operators,
improper operation.
Always discharge, de-energize and ground the equipment before attempting any
maintenance.
Only trained, knowledgeable, skilled individuals should attempt to maintain and
operate medium voltage breakers and switchgear.
NEVER use parts that are not new and original equipment from the original
equipment supplier.
It is highly recommended that factory trained personnel are employed to perform work
and or oversee site maintenance personnel until they attain a level of prociency.
SAFETY PRACTICES
DANGER

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Qualied person
Qualied persons have read the instruction manuals for the circuit breaker and
switchgear thoroughly. They have engage factory experts to explain and augment
areas not fully understood.
This / These person(s) should be trained, skilled and have full access to all Proper
Protective Equipment associated with medium voltage electrical devices including
but not limited to – hard hat, safety glasses (with prescriptions as necessary) face
shield – re retardant coveralls – arc ash suiting, insulted gloves and safety shoes as
mandated and in accordance with good practices.
Qualied persons should understand proper practices for de-energizing, grounding
and LOTO (lock out tag out) in accordance with well-established good practices.
Operations and maintenance practices should be well thought out in advance and
documented. Persons approaching this equipment should have a monitoring individual
accessible at a distance and rst aid equipment immediately on hand.
This manual provides general and informative knowledge of the breaker and
switchgear. This manual is NOT exhaustive nor detailed enough to cover every
application and event.
It is the SOLE obligation of those individuals using and overseeing operation and
maintenance of this equipment to recognize their obligation to reach out to the factory
to provide more in-depth assistance.
The equipment supplier reserves the right to make changes, improvements and
specications alterations to its equipment and procedures at any time without specic
notice or other obligation.
Under NO circumstances should this manual be considered able to
cover every event, detail or variation in equipment or conguration.
Operations and Maintenance personnel MUST be provided with and
maintain an appropriate level of knowledge and prociency to interact
with this equipment. Anything less should mandate employing properly
trained factory authorized individuals.
Nothing in this document implies or attempts in any way to alter or
modify the sales agreement, contract terms, warranty or long term
operation and maintenance obligations of the owner / using entities(s).
SAFETY PRACTICES

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Safety Practices 5-6
Table of Contents 7
Introduction 8-10
Ratings Table and weights 11-12
Receiving, Handling and Storage 13-14
Initial Checks and Functional Testing 15-21
Spring Charge / Discharge 22
General Dimensions 23-26
Vacuum Interrupter 28-37
General Construction 38-39
Citadel Controls 40-51
Switchgear Cubicle & Draw-out Features 52-87
Breaker Operation 88-99
Close & Trip Take-o󰀨 Extension Rods 100
Positive “Block the Close” Interlock 101
Masta - Main Armature Switch Take-o󰀨 Assembly 102-103
Nameplate 104-105
Maintenance 106-128
Lubrication 129-147
Sequential Operation Diagram 148
Troubleshooting Guide 149
Wiring Diagram 150-151
Spare Parts List 152-155
Tools List 156
Contact Us Back cover
TABLE OF CONTENTS

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INTRODUCTION
The Citadel vacuum circuit breaker element is designed
to meet the applicable ANSI, NEMA and IEEE standards.
Application, operation and long life of this equipment
depends upon good and proper installation as well as
proper maintenance by the user.
This instruction manual is meant to assist clients in
learning, training and developing safe and e󰀨ective
procedures for the installation, maintenance and
operations of this equipment.
The safety and health of our customers is our paramount focus and concern.
The following will be repeated regularly throughout this document.
Medium Voltage circuit breakers and switchgear are inherently dangerous
and potentially deadly.
Large mechanical forces are stored in and discharged by the mechanism.
Operating and control voltages can severely burn, ash, damage and kill.
Damage and Death, or serious injury, can be the results of untrained,
improper operation.
ONLY TRAINED, EXPERIENCED, QUALIFIED individuals should
attempt to install, operate, maintain or in other ways interact within arm’s
length of medium voltage circuit breakers and switchgear.
DANGER
Never guess!
ALWAYS Contact the factory as additional
information is desired/needed.

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ALERT WORDS
“Alert Words” are used to draw additional attention to the information presented and
note the presence of peril.
Potentially hazardous situation which should be avoided to
avert death or serious injury.
WARNING
Potentially hazardous situation which, if not avoided, might
result in moderate injury.
CAUTION
(without safety alert symbol) - A potentially hazardous
situation which can result in property damage.
CAUTION
Very hazardous situation which must be immediately
avoided, or can result in death or serious injury.
DANGER
INTRODUCTION

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NEVER attempt to override, remove or in any way defeat
any interlock functions or interlock devices.
ONLY consider such actions under VERY thoughtful
consultation with well-trained switchgear users, operations
and maintenance experts.
Defeating interlocks WILL void all warranties and may result in
property damage, injury and DEATH.
NEVER work on equipment unless it is de-energized and
grounded.
ALWAYS de-energize the control voltage and discharge the
breaker’s mechanism springs before laying hands or tools on
the breaker or switchgear devices.
NEVER work on equipment unless you are well trained on it,
and working in the proper protective equipment needed for the
operational functions you intend to perform.
NEVER force breakers!
If racking, sub-assemblies or ANY other parts that are known to
operate smoothly under normal conditions are not doing so;
WARNING
WARNING
WARNING
Assume something needs to be xed – NOT FORCED.
INTRODUCTION

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CIRCUIT
BREAKER
TYPE
MAXIMUM
DESIGN
VOLTAGE
(V)
1
VOLTAGE
RANGE
FACTOR
(K)
2
WITHSTAND VOLTAGE
LEVELS CONTINUOUS CURRENT SHORT- CIRCUIT
(I)
3,4
INTERRUPTING
TIME
5
kV RMS POWER
FREQUENCY
kV RMS
LIGHTNING
IMPULSE
(BIL)
kV CREST
A RMS kA RMS SYM ms / CYCLES
50-CTDL-31.5 4.76 1.0 19 60 1,200, 2,000,
3,000 31.5 83/5
50-CTDL-40.0 4.76 1.0 19 60 1,200, 2,000,
3,000 40 83/5
50-CTDL-50.0 4.76 1.0 19 60 1,200, 2,000,
3,000 50 83/5
50-CTDL-63.0 4.76 1.0 19 60 1,200, 2,000,
3,000, 4000 63 83/5
75-CTDL-40.0 8.25 1.0 36 95 1,200, 2,000,
3,000 40 83/5
150-CTDL-20.0 15.0 1.0 36 95 1,200, 2,000 20 83/5
150-CTDL-31.5 15.0 1.0 36 95 1,200, 2,000,
3,000 31.5 83/5
150-CTDL-40.0 15.0 1.0 36 95 1,200, 2,000,
3,000 40 83/5
150-CTDL-50.0 15.0 1.0 36 95 1,200, 2,000,
3,000 50 83/5
150-CTDL-63.0 15.0 1.0 36 95 1,200, 2,000,
3,000, 4,000 63 83/5
63KA TO 4000A + 5000A SELF COOLED - CONSULT FACTORY
• ANSI/IEEE C37.04-1999
Standard Rating Structure for AC High-Voltage
Circuit Breakers
• ANSI/IEEE C37.06-2009 AC
High-Voltage Circuit Breakers Rated on a
Symmetrical Current Basis - Preferred Ratings
and Related Required Capabilities for Voltages
Above 1,000 Volts
• ANSI/IEEE C37.09-1999
Standard Test Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis
• ANSI/IEEE C37.010-1999
Application Guide for AC High-Voltage Circuit
Breakers Rated on a Symmetrical Current Basis.
Footnotes:
1. Maximum design voltage for which the circuit breaker is
designed and the upper limit for operation.
2. K is listed for information purposes only. For circuit
breakers rated on a “constant kA” ratings basis, the
voltage range factor is 1.0.
3. All values apply to polyphase and line-to-line faults.
4. Standard duty cycle is O - 0.3 s - CO - 3 min. - CO.
5. Standard rating interrupting time is ve-cycles (83 ms).
Optional rated interrupting time of three-cycles (50 ms)
is available (except with 24 Vdc tripping).
TABLE:1
RATINGS TABLE & WEIGHTS

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PERMISSIBLE
TRIPPING
DELAY
(Y)
MAX. SYM.
INTERRUPTING
(I)
% DC
COMPONENT SHORT-TIME CURRENT (I) (3S) CLOSING AND LATCHING (MOMENTARY) CIRCUIT BREAKER TYPE
S kA RMS SYM % kA RMS ASYMMETRICAL
(1.55 X I)
kA RMS
PEAK
(2.6 X I)
kA PEAK
231.5 47 31.5 49 82 50-CTDL-31.5
240 47 40 62 104 50-CTDL-40.0
250 47 50 78 130 50-CTDL-50.0
263 47 63 98 164 50-CTDL-63.0
240 47 40 62 104 75-CTDL-40.0
220 47 20 31 52 150-CTDL-20.0
231.5 47 31.5 49 82 150-CTDL-31.5
240 47 40 62 104 150-CTDL-40.0
250 47 50 78 130 150-CTDL-50.0
263 47 63 98 164 150-CTDL-63.0
TABLE 2: WEIGHT CHART FOR ALL FIXED VCB AND DRAWOUT VCB
TABLE: 1B
RATINGS TABLE & WEIGHTS
S.no Description Weight(KGS)/per VCB lbs
1 5 - 15.0 KV, 1200A, 31.5 KA FIXED VCB 126 278
2 5 - 15.0 KV ,2000A, 40.0 KA FIXED VCB 139 307
3 5 - 15.0 KV, 1200A, 31.5 KA DRAWOUT VCB 154 338
4 5 - 15.0 KV, 2000A, 40.0 KA DRAWOUT VCB 174 382
5 5 - 15.0 KV, 4000A, 63.0 KA FIXED VCB 270 595
6 27.0 KV, 1200A, 25.0 KA FIXED VCB 127 390

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It is mandatory that the procedures of receiving personnel are to make a physical
inspection of the shipping container before removing or unpacking the circuit breaker
from the delivery truck and again prior to subsequent moving’s.
Check for shipment damage or indications of rough handling by the carrier.
Check each item against the manifest to identify any shortages.
It is the responsibility of the receiving person(s) (entities) to fully inspect and accept or
report damage. Lack of fulllment of this responsibility will have commercial impact.
Visible shipping damage must be identied by receiving individual(s) prior to signing
the delivery receipt.
Lack of such notications will allow the Factory to assume damage was done on
site and not covered by shipping insurance or warranty claims.
It is essential that notication must be presented to carrier within 15 days for
concealed damage.
1. When the shipment arrives, note whether the equipment is properly protected
from the elements. Note the trailer number the equipment arrived on.. Note
also any blocking of equipment. During unloading, check the actual equipment
delivered to verify it agrees with the delivery paperwork.
2. Make immediate inspection for visible damage upon arrival and prior to un-
packaging or un-wrapping any material(s). This should be done prior to unloading.
When inspection cannot be made on the delivery vehicle prior to unloading, a
much closer inspection during unloading must be performed and visible damage
clearly noted on the delivery receipt.
3. Get the Trailer number, license plate, drivers name and Phone # in writing and
note the date and time of the event.
RECEIVING, HANDLING & STORAGE
Inappropriate or untimely reporting
will void corrections being covered under warranty
ALWAYS Take photos!
Medium Voltage circuit breakers, switchgear and some switchgear
component are heavy and can be unwieldy.
Items of these sizes and weights can cause serious injury and death
if moving / falling and striking an individual.
Obtain the services of qualied riggers for hoisting the switchgear
and circuit breaker to avoid damage.
WARNING

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Note: Shipments are not released from the NBS factory without a clear bill of lading.
Properly developed methods have been employed for preparation, loading, tarping and
blocking the equipment in the factory, and on the truck before it leaves the NBS factory.
If the equipment is received in a damaged condition, this damage to the equipment
must have occurred while on route and beyond NBS’ control.
Without following procedures as outlined above by the receiving parties, purchaser or
their agent, NBS cannot / will not be held liable for repairs.
NBS will not be held liable for repairs in any case where repair work was attempted
and or performed prior to authorization from NBS.
1. Remove the shipping carton from the circuit breaker carefully. Keep the shipping
pallets for later possible storage use prior to installation.
2. Inspect for outward and concealed damage. Notication to carrier must take place
within 15 days to assure any claims resolution.
3. Each circuit breaker should be lifted propperly. Do not allow any force or crushing
of the side panels of the circuit breaker, or damage to the primary disconnect
(cluster) assemblies.
Refer to Table 2 (page 12) for circuit breaker weights.
4. Palletized circuit breaker can be moved using a properly rated fork-lift type device.
It is advised that IEEE std C37.20.2 section 9 and Annex are reviewd and incorporated.
Storage
1. Whenever possible, install the circuit breaker in its switchgear enclosure.
2. When the circuit breaker is to be placed on a pallet for storage, securely bolt the
breaker to the pallet and cover with strong polyethylene or non-moisture collecting
material.
Indoor storage
Store the circuit breaker indoors in a clean, dry environment that is free of construction
dust, corrosive atmosphere, mechanical abuse and extensive temperature swings.
Outdoor storage
Outdoor storage is not recommended.
Space heating
Space heating must be used to prevent condensation and corrosion. 150 - 250 watts
per circuit breaker of space heating is recommended depending on humidity and
temperature swings.
If the circuit breaker is stored inside the switchgear enclosure- energize the space
heaters if they are available.
RECEIVING, HANDLING AND STORAGE

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INITIAL CHECKS AND FUNCTIONAL TESTING
Introduction
Checks and tests to be performed on the circuit breaker module only.
Vacuum circuit breakers are normally shipped with their vacuum interrupter’s primary
contacts closed and their mechanism springs discharged.
However, it is CRUCIAL to rst verify the spring-loaded mechanism is in the discharged
condition after de-energizing control power for safety and to insure no automatic spring
charging can occur.
Discharge the close spring via mechanical front panel push button – then discharge the
opening spring via its front panel push button.
De-energizing control power in switchgear
When the circuit breaker is mounted in switchgear, open the control-power disconnect
device.
In metal-clad switchgear, the control power disconnect device is normally a pullout-type
fuse holder, a molded-case circuit breaker, or knife switch.
Opening this fuse holder, circuit breaker or switch device results in control power
disconnection.
Perform the spring-discharge check before moving a circuit breaker from a pallet or
removing it from the switchgear.
The spring discharge check should be performed after de-energizing control power.
This check assures both the tripping and closing springs are fully discharged.
1. Press Trip pushbutton.
2. Press Close pushbutton.
3. Press Trip pushbutton again.
4. Spring-condition indicator
should show - DISCHARGED
5. Main contact status indicator
should show breaker - OPEN
Open Operation
Close Operation
Open | Close
indicator
Spring-condition
indicator
FIGURE 1: FRONT PANEL CONTROLS OF CIRCUIT BREAKER

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Manual-spring charging check
1. Insert the manual-spring charging hand crank into the manual-charging
socket (refer to Figure 2B- page 18).Turn the crank clockwise (about 50 turns)
until the spring- charge / discharge condition indicator shows the
closing spring is - CHARGED
2. Repeat the above Spring- Discharge procedure.
3. Verify the springs are DISCHARGED and the circuit-breaker primary contacts are
noted as – OPEN on the front panel indicator.
As-found and vacuum-integrity check tests
Perform and record the results of an as-found insulation test.
Perform and record the results of a vacuum integrity check (dielectric) test.
Procedures for these tests are described in the Maintenance section
of this instruction manual.
Save results for future comparisons.
Automatic spring-charging check
The automatic spring-charging features of the circuit breaker must be checked. Control
power is required to automatically charge the closing spring.
Note: Do not perform the spring-discharge check if the circuit breaker is in the CONNECT
position of a draw out cubicle.
Open the circuit breaker and rack breaker to the DISCONNECT position then perform
the spring discharge check.
For xed-mounted circuit breaker applications, open any isolator switches on the line side and on
the load side of the circuit breaker before performing the spring-discharge check.
If no isolators exist – verify primary and control circuits are de-energized prior to spring discharge.
Performing a Spring discharge will close the breaker – this is not to
be allowed with breaker connected to live primary circuits.
High-speed moving parts and hazardous voltage will cause death, se-
rious injury and property damage.
Only trained, qualied personnel shall perform any of these functions.
Read instruction manuals and observe safety practices.
DANGER
INITIAL CHECKS AND FUNCTIONAL TESTING

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Never Manually Charge a circuit breaker without rst removing
control power to the motor and the balance of the Citadel Element
control circuits.
CAUTION
FIGURE 2: MANUAL CHARGING OF CLOSING SPRING
Charging the Close Springs
When it is desired to charge the Citadel Close spring manually – the high torque of the
di󰀨erential gear box makes manual operation easy.
A simple technique to supplement this manual approach can be achieved by using the
end of the breaker’s manual charging tool in a speed regulated cordless drill.
Manually charging the closing spring (refer to Figures 2 and 2B pages 17 , 18)
Insert the hand crank through the front cover opening into the manual charging port.
Engage the charging tool into the charging port’s socket. Turn the charging tool
clockwise (approx: 50 turns) until the closing-spring indicator displays “CHARGED”.
As the manual charging process starts to pick up the close springs – the operator will
feel modest additional mechanical resistance.
As the Spring Charging Arm comes over the top of its stroke and the close spring fully
charges – you will hear a distinctive “click” within the mechanism
The breaker element is now Charged and ready to Close.
Manual closing - Press the close button on the Citadel front cover. The CLOSE/ OPEN
indicator will display “CLOSED”.
Since the Close Spring has now operated to perform the close function the closing
spring indicator will now display “DISCHARGED”.
INITIAL CHECKS AND FUNCTIONAL TESTING

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Note: If a temporary source of control power is required – verify control-power source
is of the proper voltage per the breakers nameplate or the specically provided
schematic drawings with the breaker and switchgear.
When control power is connected to the circuit breaker, the closing spring will automatically
begin to charge.
1. Open control-power circuit by opening the control power disconnect device.
2. Connect control power to proper charging motor pins of secondary or xed
mounted breaker top terminal block
3. Energize (close) the control power circuit disconnect.
4. Use the Close and Open controls (refer to Figure 1 page 15) to rst Close and
then Open the circuit breaker contacts. Verify contact positions by visually
observing the OPEN/ CLOSED indicator on the circuit breaker front panel. Use an
ohm-meter to verify contacts are closed electrically and provide dual verication
of the front panel indicator.
5. De-energize control power by repeating Step 1 above. If a secondary connector
umbilical cord was used for temporary control-power connections, disconnect the
umbilical cord from the switchgear rst and next from the circuit breaker.
6. Perform the above mentioned spring-discharge check again to verify that the
closing spring is discharged and the primary contacts of the circuit breaker
vacuum interrupters are open.
Final mechanical inspections without control power
Make a nal mechanical inspection of the circuit breaker.
Verify the contacts are in the open position and the closing spring is discharged.
Check for loose hardware.
Manual
Charging
Tool
Insert Point
for Manual
Charging Tool
FIGURE2B:MANUALCHARGINGOFCLOSINGSPRING
INITIAL CHECKS AND FUNCTIONAL TESTING

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Since the closing spring is automatically recharged by the motor operating
mechanism when the breaker has closed; the operating mechanism is capable of an
open-close-open duty cycle as required for rapid auto-reclosing.
Opening
The tripping spring is charged during closing. To open the breaker, press the trip
button until the vacuum breaker has tripped and “OPEN” is displayed by indicator.
Manual Operation
Electrically operated vacuum breakers can be operated manually if the control
supply should fail.
Manually Charging the Closing Spring
Insert the hand-crank in hole and turn clockwise until charge spring
mechanism “clicks” and indicator shows spring “CHARGED”.
FIGURE: 3
Open Operation
Close Operation
Manual
Charging
Tool
Insert Point
for Manual
Charging Tool
Open | Close
indicator
Spring-condition
indicator
INITIAL CHECKS AND FUNCTIONAL TESTING

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Open Operation
Close Operation
Open | Close
indicator
Spring-condition
indicator
Manual opening - The opening spring is automatically charged during closing process.
To open the circuit breaker, press the Open pushbutton on the Citadel front cover.
The CLOSE/ OPEN indicator will display “OPEN”
In order to avoid injuries as a result of the motor suddenly starting up, the circuit
breaker spring must only be charged manually with the special hand crank.
An Optional special hand charging crank which automatically disengages if the
spring-charging motor operates can be factory ordered.
FIGURE1A:FRONTPANELCONTROLSOFCIRCUITBREAKER
Disconnect motor control power when attempting manual
charging.
CAUTION
FIGURE1:FRONTPANELCONTROLSOF CIRCUITBREAKERFIGURE 1B
INITIAL CHECKS AND FUNCTIONAL TESTING