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nbs Citadel 2.0 Series Installation, Operation And Maintenance Manual

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15kV-63kA-Draw-out
Citadel
Vacuum Breaker
®
Installation, operations and maintenance manual
1
Citadel 2.0 - Instruction Manual - page:

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  • Page 1 15kV-63kA-Draw-out Citadel Vacuum Breaker ® Installation, operations and maintenance manual Citadel 2.0 - Instruction Manual - page:...
  • Page 2 15kV-63kA-4000A Citadel Fixed Mounted ® Vacuum Breaker Citadel 2.0 - Instruction Manual - page:...
  • Page 3 15kV-63kA-4000A Citadel Draw-Out ® Vacuum Breaker and Cell Citadel 2.0 - Instruction Manual - page:...
  • Page 4 Citadel® Available Ratings Narrow Fixed and Draw-Out VCB Elements Width Width Voltage CTDL Model # - kA Available Fixed Draw-Out Class Amperage FX|DO Element Element 19.6” 22.125” 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”...

  • Page 5: Safety Practices

    S A F E T Y P R A C T I C E S This instruction manual applies to fixed mounted and draw out DANGER 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.
  • Page 6 S A F E T Y P R A C T I C E S Qualified person Qualified 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.

  • Page 7: Table Of Contents

    T A B L E C O N T E N T S Safety Practices Table of Contents 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 General Dimensions 23-26 Vacuum Interrupter...

  • Page 8: Introduction

    I N T R O D U C T I O N DANGER 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.
  • Page 9 I N T R O D U C T I O N ALERT WORDS “Alert Words” are used to draw additional attention to the information presented and note the presence of peril. DANGER Very hazardous situation which must be immediately avoided, or can result in death or serious injury.
  • Page 10 I N T R O D U C T I O N WARNING 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.
  • Page 11 R A T I N G S T A B L E & W E I G H T S TABLE: 1 CIRCUIT MAXIMUM VOLTAGE WITHSTAND VOLTAGE CONTINUOUS SHORT- INTERRUPTING BREAKER DESIGN RANGE LEVELS CURRENT CIRCUIT TIME TYPE VOLTAGE FACTOR kV RMS POWER LIGHTNING...
  • Page 12 R A T I N G S T A B L E & W E I G H T S TABLE: 1B PERMISSIBLE MAX. SYM. % DC SHORT-TIME CLOSING AND LATCHING CIRCUIT TRIPPING INTERRUPTING COMPONENT CURRENT (I) (3S) (MOMENTARY) BREAKER TYPE DELAY kA RMS SYM kA RMS...
  • Page 13 R E C E I V I N G , H A N D L I N G & S T O R A G E 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.

  • Page 14: Receiving, Handling And Storage

    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’...

  • Page 15: Initial Checks And Functional Testing

    I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G 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.
  • Page 16 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G Note: Do not perform the spring-discharge check if the circuit breaker is in the CONNECT position of a draw out cubicle.
  • Page 17 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G Never Manually Charge a circuit breaker without first removing CAUTION control power to the motor and the balance of the Citadel Element control circuits.
  • Page 18 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G FIGURE 2B: MANUAL CHARGING OF CLOSING SPRING Manual Charging Tool...
  • Page 19 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G Since the closing spring is automatically recharged by the motor operating mechanism when the breaker has closed;...
  • Page 20 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G FIGURE 1A: FRONT PANEL CONTROLS OF CIRCUIT BREAKER Close Operation Open Operation Spring-condition...
  • Page 21 I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G Breaker’s-indication-panel On the Citadel front panel near center on left side is an indication panel. This panel provides color coded intuitive symbology for;...

  • Page 22: Spring Charge / Discharge

    S P R I N G C H A R G E D I S C H A R G E A mechanical flagging assembly is moved by the rotation of the closing spring crank arm. When the closing spring is “CHARGED” the following pictorial is seen in the window located on the lower left portion of the Citadel’s front cover.
  • Page 23 G E N E R A L D I M E N S I O N S Breaker dimensions for “6 inch” pole center fixed mounted elements DRAWING 1 - FIXED 01. MECHANISM ENCLOSURE 02. COPPER RUNBACK 03. PUSHROD ASSEMBLIES 04.

  • Page 24: General Dimensions

    G E N E R A L D I M E N S I O N S Breaker dimensions for 26” wide draw-out switchgear DRAWING 2 - DRAW-OUT 05. MOVABLE SECONDARY HANDLE 01. MECHANISM ENCLOSURE 06. VACUUM INTERRUPTER 02. VACUUM INTERRUPTER SUPPORT MOLDING 03.

  • Page 25: 04. Vacuum Interrupter

    G E N E R A L D I M E N S I O N S Breaker dimensions for “10 inch” pole center fixed mounted element DRAWING 3 - FIXED ELEMENT 07. FLEXIBLE SHUNT TYPE-1 (OUTER) 01. UPPER FLANGE / HEATSINK 02.
  • Page 26 G E N E R A L D I M E N S I O N S Breaker dimensions for 36” wide draw-out switchgear DRAWING 4 - DRAWOUT 01. UPPER HEAT SINK 09. LOWER SHUNT #3 (SIDE) 02. LOWER HEAT SINK 10.
  • Page 27 This section describes the breaker’s major subassembly and is a basic primer tool in the operation, installation, maintenance of the circuit breaker. NBS recommends engaging factory trained persons only to perform repair services. Citadel 2.0 - Instruction Manual - page:...
  • Page 28 V A C U U M I N T E R R U P T E R O P E R A T O R Vacuum interrupters The vacuum interrupter is a simple device with two internal electrical power conducting contacts. One is secured in place and stationary within the vacuum interrupter assembly.
  • Page 29 V A C U U M I N T E R R U P T E R O P E R A T O R Customers should develop their own switchgear testing plan and data collection methodology prior to receiving switchgear and placing it in service. Baseline micro-ohm readings should be obtained by well-trained technicians using calibrated, certified utility grade test equipment only.
  • Page 30 V A C U U M I N T E R R U P T E R O P E R A T O R 1600A VI 2500A VI 4000A VI 5000A VI Citadel 2.0 - Instruction Manual - page:...
  • Page 31 V A C U U M I N T E R R U P T E R O P E R A T O R TABLE: 3 Vacuum Interrupter - Type: C14 - TECHNICAL DATA Rated Voltage 15 kV (60Hz) Short-time (1min) power -frequency withstand voltage 38 kV Rated current...
  • Page 32 V A C U U M I N T E R R U P T E R O P E R A T O R TABLE: 4 Vacuum Interrupter - Type: B32 - TECHNICAL DATA Rated Voltage 15 kV (60Hz) Short-time (1min) power -frequency withstand voltage 38 kV Rated current...
  • Page 33 I N T E R R U P T E R O P E R A T O R TABLE: 5 Vacuum Interrupter - 15 kV/4000 A - 63 kA - TECHNICAL DATA - NBS BOV 61156 Rated Voltage 15 kV (60Hz)
  • Page 34 V A C U U M I N T E R R U P T E R O P E R A T O R Vacuum Interrupters Life Expectation Curve - ANSI C 37.09 breakers The life expectancy of vacuum interrupters is a function of the number of interruptions and magnitude of current interrupted.
  • Page 35 I N T E R R U P T E R O P E R A T O R TABLE: 6 Vacuum Interrupter - 15 kV / 5000 A - 63 kA - TECHNICAL DATA - NBS - CGD - 2277B Rated Voltage 15 kV (60Hz)
  • Page 36 V A C U U M I N T E R R U P T E R O P E R A T O R Vacuum Interrupters Life Expectation Curve - ANSI C 37.013 breakers The life expectancy of vacuum interrupters is a function of the number of interruptions and magnitude of current interrupted.
  • Page 37 I N T E R R U P T E R O P E R A T O R TABLE: 7 Vacuum Interrupter - 38 kV / 3000 A - 44 kA - TECHNICAL DATA - NBS - CGD - 2297G2 Rated Voltage 38 kV...

  • Page 38: General Construction

    G E N E R A L C O N S T R U C T I O N General Construction concept of Citadel vacuum breaker elements Vacuum circuit breakers consist of a source of mechanical power that in turn operates on an interrupting medium in this case a vacuum interrupter.
  • Page 39 G E N E R A L C O N S T R U C T I O N FIGURE:: 10 FIGURE :11 Bolted Landing Pads For Busbar Connectors Finger Cluster Primary Connectors Interphase Barriers Pole support stand off insulator FIGURE: 12 FIGURE :13 Citadel 2.0 - Instruction Manual - page:...
  • Page 40 C I T A D E L C O N T R O L S FIGURE: 14 FRONT VIEW Housing Enclosure Anti-Pumping Relay (X-Y) Terminal Block(s) (fixed Element Only) Shock Absorber (Behind item 14) Closing Solenoid Operations Counter Manual Closing Button LH MASTA Open Solenoid Open/Close Indicator...

  • Page 41: Citadel Controls

    C I T A D E L C O N T R O L S Stored-energy operating mechanism; The stored-energy operating mechanism of the circuit breaker is a balanced system of springs, solenoid coils and mechanical devices designed to provide a number of specific and critical functions.
  • Page 42 C I T A D E L C O N T R O L S Secondary Wiring Control power and control signals (both input and output) are engaged / dis-engaged to the Draw-out Citadel element via a multi-point moving secondary contact assembly. (figure 16) Controls and power Aux contacts...
  • Page 43 C I T A D E L C O N T R O L S Motor-operating mechanism (refer to Figure 18) The spring-charging motor is bolted to the bottom of the charging mechanism’s high- torque anti-slip gear box. This combination sub-assembly is installed in the upper left quadrant of the operator mechanism’s housing.
  • Page 44 C I T A D E L C O N T R O L S Manual Close Button Close coil Trip coil Manual Open Button Operating Coil Terminal Block FIGURE 19 Close coil (52CC) The close coil is a standard component of the Citadel circuit breaker used to close the circuit breaker electrically by unlatching the closing spring and releasing its stored energy.
  • Page 45 C I T A D E L C O N T R O L S FIGURE 20 Motor Lead Second Trip coil Close & Trip Coil TABLE 10 ANSI/IEEE C37.06 Close coil Trip coil Coil control voltages resistance in ohm’s Nominal Range Close...
  • Page 46 C I T A D E L C O N T R O L S Citadel 2.0 - Instruction Manual - page:...
  • Page 47 C I T A D E L C O N T R O L S FIGURE 21 Dual Trip coils The Trip coils electrically open the circuit breaker from a signal provided by protective relays or other control devices. When more than one trip coil is desired a second trip coil can be provided and is generally connected to a separate control power source than the main trip coil.
  • Page 48 C I T A D E L C O N T R O L S The Citadel incorporates a number of micro-switches within its control circuitry. Customers should familiarize themselves with the Citadel’s control schematic for their specific breakers’ to understand the function of each of the micro switches. If breaker controls are working properly and no concerns exist regarding the micro-switches / no maintenance need be considered.
  • Page 49 C I T A D E L C O N T R O L S FIGURE 23 Micro-switch S28 - cuts motor circuit during racking procedure. If Citadel breaker control component concerns exist; Micro-Switch Checks should include: • No breakage or excessive wear of the plastic housing. •...
  • Page 50 C I T A D E L C O N T R O L S Micro switches # 29 & 30 are activated by the “Block the Close” mechanism. When the Citadel racking tool is inserted or the breaker is in between Disconnect and Connect positions – Block the Close mechanical interlocking will cut off the Close Coil #29 &...
  • Page 51 C I T A D E L C O N T R O L S Auxiliary switch (52a/b) The Citadel circuit breaker has a multi contact auxiliary switch within its mechanism (see figure 25). This switch provides numerous auxiliary contacts for internal circuit breaker control use during closing and opening.
  • Page 52 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S The following section will focus on the Citadel Features that work in harmony between the breaker cell FIGURE 26 List of features...

  • Page 53: Switchgear Cubicle & Draw-Out Features

    S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Heavy Duty Stainless Steel Hardware Solid handle with large eye for padlocks and LOTO devices Heavy Duty Hinges for long life and smooth operation FIGURE 28 FIGURE 29...
  • Page 54 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S FIGURE 32 FIGURE 33 List of features 1.
  • Page 55 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S FIGURE 34 Breaker rack-in door interlock shipped deactuated Breaker rack-in position indicator rear...
  • Page 56 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S FIGURE 35A FIGURE 35B FIGURE 35C FIGURE 35D List of features 7.
  • Page 57 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker Racking Position Rocker Arm As the Citadel breaker racks into the connect position - the front of the breaker racking position rocker arm seesaws upwards.
  • Page 58 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker Position Indicator If the Citadel cell is empty or the breaker is in the Disconnected position The Cell mounted Breaker Racking Position rocker-arm that moves the door mounted semaphore is in the lowered position.
  • Page 59 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker Open - Close indication actuator for front door indication The Citadel can uniquely let personnel know the breaker is open or closed –...
  • Page 60 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker Disconnect Position Latch FIGURE 42 Left side latch bracket FIGURE 43 Right side latch bracket...
  • Page 61 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Operating the disconnect position interlock Large easy grip handle FIGURE 45 Ergonomic hand actuator for interlock release...
  • Page 62 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Citadel Disconnect vs Connect position The Citadel’s dual position functionality, enhances Operator confidence. When the racking screw spins free –...
  • Page 63 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Solid steel rails Solid steel rails guide and securely hold the Citadel’s concave steel wheels as the Citadel enters, connects and exits the switchgear cell.
  • Page 64 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Floor Lifter for breaker paddles FIGURE 51 Operational Connect position Operational...
  • Page 65 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Close & Trip Rollers and position indication pin Close and Trip rollers are actuated by the lifter plate on the switchgear floor.
  • Page 66 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S 6th wheel. The Citadel carriage employs a 6th wheel configuration for ease of mobility when the breaker is removed from cubicle FIGURE 54 6th wheel...
  • Page 67 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker retention brackets Two heavy duty rollers on both the left and right of the Citadel roll directly under the cubicle’s breaker retention brackets.
  • Page 68 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Stationary Racking Nut The Citadel racking system is simple, rugged and guided by safety. More information can be found in the section on breaker racking.
  • Page 69 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Stationary copper ground conductor - Silver platted Copper 2.375 x 0.5” FIGURE 60 Ground conductor...
  • Page 70 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S TOC # 1 – Provides electrical indication that a breaker is in the cubicle in the Disconnect Position 2NO+2NC FIGURE 61A FIGURE 61B...
  • Page 71 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S TOC # 2 – Provides electrical indication that a breaker is in the cubicle in the Connect Position 2NO+2NC FIGURE 62A FIGURE 62B...
  • Page 72 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Citadel in Disconnect position FIGURE 63 Citadel 2.0 - Instruction Manual - page:...
  • Page 73 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S The moving secondary block frame is mechanically connected to a secondary slider batton on the front of the Citadel breaker.
  • Page 74 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Engaging the Test position To place Citadel in Test while in the Disconnect position –simply release the secondary handle latch, move handle to a horizontal positon –give a smoot lateral push on the handle to seat the moving secondary connector pins into their stationary cell counterparts.
  • Page 75 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Dis-engaging secondaries The Citadel secondary batton handle incorporates a leveraging upper section to assist in the dis-engagement of secondary contacts.
  • Page 76 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Breaker position lock (often a (Kirk) Key type lock is used) Optional Breaker position lock (often employing a kirk type lock) prevents breaker from being racked and can release a key for sequencing FIGURE 67A...
  • Page 77 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Shutter arm actuators The Stationary Primary Disconnects are covered by grounded metal shutters when the Citadel is in the Disconnected Position or the cell is empty.
  • Page 78 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Shutter lifting arms As the Citadel racks into position - a roller on each side of the Citadel carriage lifts the right and left shutter arm assembly to access the primary disconnects Grounded metal shutters Metal shutters operated by a dual arm lifting system, move smoothly and securely...
  • Page 79 S W I T C H G E A R C U B I C L E Stationary Primary Disconnects Primary Disconnects have large silver plated copper conductor with finger cluster guide pin recesses (for 63 kA). The Primary Disconnect bottles can handle multiple CT configurations FIGURE 71 Citadel 2.0 - Instruction Manual - page:...
  • Page 80 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Stationary Primary Disconnect bus connection pad The bus connection pad on the rear of the stationary Primary Disconnect conductor has a large surface area and multiple threaded bolt-holes to insure a good conductive connection...
  • Page 81 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Moving Primary Disconnect Assemblies I.e. Finger clusters - are always conservative and rated for surface area and spring pressure.
  • Page 82 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S FIGURE 74A FIGURE 74B Moving Secondary Contact Assembly Moving Secondary Contact Assembly Secondary contacts are one above...
  • Page 83 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Stationary Secondary with optional B-MOC Stationary secondary contact block Block “A”...
  • Page 84 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S FIGURE 79 FIGURE 80 Block A Block B Citadel 2.0 - Instruction Manual - page:...
  • Page 85 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S The male moving secondary contact blocks contain twenty-six (26) pins which engage with female counterparts on the stationary (cell) side.
  • Page 86 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S B-MOC (Patent pending) When Customers wish to increase the number of auxiliary contacts – the rugged mounting frames for holding the moving &...
  • Page 87 S W I T C H G E A R C U B I C L E & D R A W - O U T F E A T U R E S Interlocks Interlocks are at the very heart of the Citadel’s ruggedness and safety practices. Interlocks are designed to work SMOOTHLY and in layers.

  • Page 88: Breaker Operation

    B R E A K E R O P E R A T I O N If Customer’s wish to have an interlock that prevents the switchgear door from opening if the breaker is racked in, they will need to loosen the two mounting screws, rotate the bracket horizontally and then insert and tighten the two mounting screws.
  • Page 89 B R E A K E R O P E R A T I O N Block the Racking Port Citadel breakers are racked into and out of their respective cells via a racking tool inserted into the breaker’s racking port. The racking port is located at the center of the lower portion of the breaker.
  • Page 90 B R E A K E R O P E R A T I O N Citadels are cognizant that America’s most popular GE Magneblast Breakers used a “Block the Close” racking procedure. GE Magneblast Block the Close - Dis-Engaged (mechanical mechanism block &...
  • Page 91 B R E A K E R O P E R A T I O N Block the Close An additional layer of Safety for operating personnel is added to draw-out Citadel breakers by an interlock known as “Block the Close”. Whenever the racking tool is inserted into the Citadel racking port –...
  • Page 92 B R E A K E R O P E R A T I O N Racking port FIGURE 86 empty Racking port FIGURE 87 tool inserted FIGURE 87B The insertion of racking tool engages breaker racking screw in this manner Citadel 2.0 - Instruction Manual - page:...
  • Page 93 B R E A K E R O P E R A T I O N FIGURE 88 Close door racking standard FIGURE 89 Citadel 2.0 - Instruction Manual - page:...
  • Page 94 B R E A K E R O P E R A T I O N CRS - (Citadel Racking System ) - Son of DH-P (Patent pending) The Westinghouse DH-P circuit breaker produced at the fabled East Pittsburgh switchgear works had a unique and ingenious racking device that allowed the breaker to fully rack in or fully rack out and then the racking screw would simply Spin Free.
  • Page 95 B R E A K E R O P E R A T I O N Breaker Rating Interference Key All Citadel breakers will be provided with a special bracket that allows only the proper rated breaker to be inserted into an associated properly rated switchgear cubicle. On the floor of the Citadel Cubicle is mounted a universal bracket with comb teeth along its top edge.
  • Page 96 B R E A K E R O P E R A T I O N Introduction The Citadel circuit-breaker’s operator mechanism is employed for fixed mounted and draw-out switchgear applications conforming to the applicable requirements of ANSI/IEEE standards, including C37.20.2, C37.04, C37.06, C37.09 and C 37.013. The Citadel product line is generally applied to distribution circuit breaker applications.
  • Page 97 B R E A K E R O P E R A T I O N OPEN CLOSE THIS QR CODE WILL LINK TO A VIDEO OF THE CITADEL MECHANISM IN OPERATION DISCHARGED & OPEN - FIGURE 92A DISCHARGED & CLOSE- FIGURE 92B OPEN CLOSE CHARGED &...
  • Page 98 B R E A K E R O P E R A T I O N Hydraulic Shock Absorber The Citadel mechanism employs a shock absorbing devices. The shock absorber should be visually inspected during regular maintenance intervals to verify that there is no evidence of leakage.
  • Page 99 B R E A K E R O P E R A T I O N Trip-free operation of draw-out breakers (refer to Figures 95) All draw-out Citadel circuit breakers are of a trip free design. Breakers that are not in the proper position within the cell (i.e. they are not in Connect or Disconnect positions) or have certain dedicated trip free interlocks engaged;...

  • Page 100: Close & Trip Take-Off Extension Rods

    Each extension rod comes with threaded inner diameters to accept an M6 bolt. NBS takes no responsibility nor warrants the interface connections provided by any breaker conversion company between the original breaker’s “trip free”, & “spring discharge”...

  • Page 101: Positive "Block The Close" Interlock

    It is not necessarily employed during the conversion process. Customers should learn about this optional feature and its possible inclusion in any final conversion design. NBS takes no responsibility nor warrants the interface connections provided by any breaker conversion company between the original breaker’s “trip free”, &...
  • Page 102 M A S T A - M A I N A R M A T U R E S H A F T T A K E - O F F A S S E M B L Y The Fixed Mounted Citadel was developed to provide convenience for conversion of older breakers as well as easy connections of mechanical linkages for fixed mounted applications.
  • Page 103 M A S T A - M A I N A R M A T U R E S H A F T T A K E - O F F A S S E M B L Y MB TAP 30.0 mm 20.0 mm 10.0 mm...

  • Page 104: Nameplate

    N A M E P L A T E S Draw-out Breaker Nameplate FIGURE 102 Citadel Conversions Nameplate SERIAL# National Breaker Services STYLE# MANUAL# (800) 806-5552 DATE WEIGHT AIR CIRCUIT BREAKER RATINGS CONVERTED BREAKER RATINGS TYPE AMPS TYPE AMPS RATED KV RATED MVA RATED KV RATED KA...
  • Page 105 N A M E P L A T E S TABLE 14 Nameplate Content - Explained Designates circuit breaker model number and broadly identifies application in terms Type of maximum voltage and interruption capabilities Amps Rated continuous current is the designated limit of current in RMS at rated amperes frequency, which the breaker may be expected to carry without exceeding temperature limitations.

  • Page 106: Maintenance

    M A I N T E N A N C E This section covers Inspection, Preventive Maintenance, Maintenance and Good Operating Practices The following is NOT in any way to be considered exhaustive. WARNING PERSONS not fully trained and practiced at the tasks before them Should Not attempt to operate, or make any attempts at maintenance.
  • Page 107 A good preventative maintenance program should reveal if such actions are warranted to prevent malfunctions during operation. NBS highly recommends Users hire factory trained technicians to perform maintenance and preventative maintenance functions if on-site personnel are not thoroughly versed and trained on this equipment.
  • Page 108 Drift pins: 1/8, 3/16 and 1/4 in • Retaining ring plier (external type, tip diameter 0.038 in). The above list is subject to change without notice. Check the NBS website or call the factory for the most current information Citadel 2.0 - Instruction Manual - page:...
  • Page 109 M A I N T E N A N C E FIGURE 104 Citadel 2.0 - Instruction Manual - page:...
  • Page 110 M A I N T E N A N C E Citadel 2.0 - Instruction Manual - page:...
  • Page 111 M A I N T E N A N C E Citadel 2.0 - Instruction Manual - page:...
  • Page 112 M A I N T E N A N C E Citadel 2.0 - Instruction Manual - page:...
  • Page 113 M A I N T E N A N C E Citadel 2.0 - Instruction Manual - page:...
  • Page 114 M A I N T E N A N C E Citadel 2.0 - Instruction Manual - page:...

  • Page 115: Lubrication

    M A I N T E N A N C E THE LISTS AND INTERVAL OF PERIODICAL INSPECTION - TABLE 15 Inspection Description Interval Items 1. Clean the insulated surface with a dry cloth to remove dust and moisture. 2. Check the exterior for damage. General 3.
  • Page 116 M A I N T E N A N C E Visual Inspection The purpose of visual inspection is to check the visible exterior of the breaker in its usual operation and withdrawn positions. Once a year, a general visual inspection should be carried out.
  • Page 117 M A I N T E N A N C E DANGER Hazardous voltage and high-speed moving parts will cause death, serious injury and property damage. NEVER bypass interlocks or otherwise defeat interlocks. Interlocks must be in operation at all times. Read instruction manuals, observe safety instructions and use qualified, trained personnel ONLY.
  • Page 118 M A I N T E N A N C E DANGER Failure to maintain the equipment could result in death, serious injury or product failure and can prevent successful functioning of the connected apparatus. • Do not work on a breaker in the “connected” position. •...
  • Page 119 ONLY factory NEW vacuum interrupters are to replace existing Citadel interrupters. Always consider replacing vaccum interrupters as a set. Except for hardware; NEVER use any parts on a Citadel other than NBS supl\plied factory new. Citadel 2.0 - Instruction Manual - page:...
  • Page 120 M A I N T E N A N C E Vacuum-integrity check (using mechanical test) (refer to Figure 111, page 125) Before putting the circuit breaker into service, or if a vacuum interrupter is suspected of leaking as a result of mechanical damage, check the vacuum integrity either mechanically as described in this section, or electrically using a high-potential test set as described in the next section.
  • Page 121 M A I N T E N A N C E Open FIGURE 110A With Pin Closed FIGURE 110B Without Pin Citadel 2.0 - Instruction Manual - page:...
  • Page 122 M A I N T E N A N C E Vacuum interrupters may WARNING emit X-ray radiation This can result in serious injury. Keep personnel more than six feet away from a circuit breaker under test. High-potential tests; Vacuum-integrity test and insulation tests involve the use of high-voltage test equipment.
  • Page 123 M A I N T E N A N C E Maximum ac rms Maximum dc Equipment Equipment rated maximum voltage power-frequency test voltage kV average test voltage rating kV withstand kV (rms) 4.76 8.25 15.0 15.5 TABLE 18 As-found insulation and contact resistance tests; As-found tests verify the integrity of the circuit breaker insulation system.
  • Page 124 M A I N T E N A N C E Checking the primary power path; The primary power path pole assembly consists of the three vacuum interrupters in an insulated molded mounting assembly for 6” pole spacing breakers. A primary power paths are open air heatsink clamped VI’s for 10”...
  • Page 125 M A I N T E N A N C E Perform the contact-erosion check. Contact erosion occurs when high fault-currents are interrupted. Determination of contact wear condition is checked by viewing the contact-erosion dot (Figure 111). The contact-erosion dot is located on the vacuum interrupter’s movable stem near the guide-bushing.
  • Page 126 M A I N T E N A N C E Contact Erosion Continued Draw out breakers often have run-backs and finger clusters that impede direct visualization of the VI contact erosion dot. In such cases a simple alternative test can be performed with a “Citadel erosion wear tool”...
  • Page 127 M A I N T E N A N C E Note: The testing procedure is identical for all three phases. The videos are more or less identical – each depicting either Phase A - B or C. The purpose is to show that a normal size arm with tool in hand can reach the measuring point relatively unimpeded.
  • Page 128 M A I N T E N A N C E CAUTION Failure to maintain the equipment could result in death, serious injury or product failure and can prevent successful functioning of the connected apparatus. • Do not work on a breaker in the “connected” position. •...
  • Page 129 L U B R I C A T I O N Maintenance and lubrication This section provides recommended information for Citadel circuit breaker and cell lubrication. This information is based upon the Citadel circuit breaker operating under “usual service conditions” as per ANSI / IEEEC 37.20.2, section 4 (for drawout circuit breakers) or ANSI / IEEE C37.04.
  • Page 130 L U B R I C A T I O N Lubrication Points - Citadel™ Breaker Element FIGURE 35B - OPERATOR MECHANISM LUBRICATION - LUBRICANT SECTORS FIGURE 113 Citadel 2.0 - Instruction Manual - page:...
  • Page 131 L U B R I C A T I O N FIGURE 114 Citadel 2.0 - Instruction Manual - page:...
  • Page 132 L U B R I C A T I O N FIGURE 115 Citadel 2.0 - Instruction Manual - page:...
  • Page 133 L U B R I C A T I O N FIGURE 116 Citadel 2.0 - Instruction Manual - page:...
  • Page 134 L U B R I C A T I O N FIGURE 117 Citadel 2.0 - Instruction Manual - page:...
  • Page 135 L U B R I C A T I O N FIGURE 118 Citadel 2.0 - Instruction Manual - page:...
  • Page 136 L U B R I C A T I O N FIGURE 119 Citadel 2.0 - Instruction Manual - page:...
  • Page 137 L U B R I C A T I O N FIGURE 120 Citadel 2.0 - Instruction Manual - page:...
  • Page 138 L U B R I C A T I O N FIGURE 121 Citadel 2.0 - Instruction Manual - page:...
  • Page 139 L U B R I C A T I O N FIGURE 122 Citadel 2.0 - Instruction Manual - page:...
  • Page 140 L U B R I C A T I O N FIGURE 123 Citadel 2.0 - Instruction Manual - page:...
  • Page 141 L U B R I C A T I O N Lubrication Points - Switchgear Cell FIGURE 35B - CELL LUBRICATION - SECTORS FIGURE 124 Citadel 2.0 - Instruction Manual - page:...
  • Page 142 L U B R I C A T I O N FIGURE 125 Citadel 2.0 - Instruction Manual - page:...
  • Page 143 L U B R I C A T I O N FIGURE 126 Citadel 2.0 - Instruction Manual - page:...
  • Page 144 L U B R I C A T I O N FIGURE 127 Citadel 2.0 - Instruction Manual - page:...
  • Page 145 L U B R I C A T I O N FIGURE 128 Citadel 2.0 - Instruction Manual - page:...
  • Page 146 L U B R I C A T I O N FIGURE 129 Citadel 2.0 - Instruction Manual - page:...
  • Page 147 L U B R I C A T I O N FIGURE 130 Citadel 2.0 - Instruction Manual - page:...

  • Page 148: Sequential Operation Diagram

    S E Q U E N T I A L O P E R A T I O N D I A G R A M FIGURE 131 - OPERATOR SEQUENTIAL OPERATION DIAGRAM Closing To avoid a continuously applied closing command causing the circuit breaker to reclose automatically after it has tripped out on a fault as well as damaging the close coil –...

  • Page 149: Troubleshooting Guide

    TABLE 20 - TROUBLESHOOTING GUIDE Symptom Cause Action Motor switch off Check Cable of Motor Line No control power Breaker in Disconnect Position Breaker will not charge Motor will not run Replace the Motor Spring charged Check the Spring Charged Indicator Closing spring not charged Charge Closing Spring Breaker closed...

  • Page 150: Wiring Diagram

    W I R I N G D I A G R A M Citadel 2.0 - Instruction Manual - page:...
  • Page 151 W I R I N G D I A G R A M Citadel 2.0 - Instruction Manual - page:...

  • Page 152: Spare Parts List

    S P A R E P A R T S L I S T WARNING The use of unauthorized parts in the repair of the equipment, or tampering by unqualified personnel can result in hazardous conditions, that can result in death, serious injury or property damage. WARNING The use of unauthorized parts in the repair of the equipment, or tampering by unqualified personnel will void all warranties.
  • Page 153 S P A R E P A R T S L I S T 1600A Vacuum Interruptor 2500A Vacuum Interruptor 4000A Vacuum Interruptor 5000A Vacuum Interruptor Charging Motor 48V DC - 120VAC/DC - 240 VAC/DC Auxiliary switch Opening / Closing (coil) solenoid 48V DC - 120VAC/DC - 240 VAC/DC Citadel 2.0 - Instruction Manual - page:...
  • Page 154 S P A R E P A R T S L I S T Anti-Pump Contactor Specify control voltage Bridge Rectifier Specify control voltage Operations Counter Red Push Button Green Push Button Epoxy molded VI housing Push Rod Assembly Push Rod Assembly Citadel 2.0 - Instruction Manual - page:...
  • Page 155 S P A R E P A R T S L I S T Front Panel (blank ) Front Panel (silk Screened) Indication escutcheon panel ( blank) Indication escutcheon panel (silk screened) Gear box Micro Switches Citadel 2.0 - Instruction Manual - page:...

  • Page 156: Tools List

    C I T A D E L T O O L S L I S T Citadel® tools list Vacuum interrupter wipe gauge Racking tool manual operation handle Racking tool extension rod Close spring charging tool for semi-autonomous application Manual spring charge handle Racking tool Racking tool adapter for semi-autonomous application Semi-autonomous torque generator...
  • Page 157 N O T E S Citadel 2.0 - Instruction Manual - page:...

  • Page 158: Contact Us

    Field Services NBS can provide factory-trained field service representatives to provide technical guidance and advisory assistance for the installation, overhaul, repair and maintenance of our equipment. Contact NBS at: (203) 756-2524 Ask for service Dept. or Info@nationalbreaker.com National Breaker Services, L.L.C.

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