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Powell Power/Vac Instruction Bulletin

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Instruction Bulletin - 01.4IB.67000 Power/Vac® Metal-Clad Switchgear
5kV & 15kV 20kA, 25kA, 31.5kA, 40kA, 50kA, & 63kA 1200A, 2000A, 3000A, 3500A, & 4000A FC
Power/Vac® Metal-Clad Switchgear 5kV & 15kV

Contact Information

Powell Electrical Systems, Inc.
powellind.com
info@powellind.com
01.4IB.67000
Service Division
7232 Airport Blvd.
Houston, Texas 77061
Tel: 1.800.480.7273
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01.4IB.67000
DANGER
WARNING
CAUTION
CAUTION
NOTICE
Signal Words
As stated in ANSI Z535.4-2007, the signal word is a word that calls attention to the safety sign and designates a degree or level of hazard seriousness. The signal words for product safety signs are “Danger”, “Warning”, “Caution” and “Notice”. These words are defined as:
!
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
!
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Qualified Person
For the purposes of this manual, a qualified person, as stated in NFPA 70E®, is one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved. In addition to the above qualifications, one must also be:
1. trained and authorized to energize, deenergize, clear, ground, and tag circuits and equipment in accordance with established safety practices.
2. trained in the proper care and use of personal protective equipment (PPE) such as rubber gloves, hard hat, safety glasses or face shields, flash clothing, etc., in accordance with established safety practices.
3. trained in rendering first aid if necessary.
!
CAUTION, used with the safety alert symbol, indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
CAUTION, used without the safety alert symbol, is used to address practices not related to personal injury.
NOTICE is used to address practices not related to personal injury.
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000

Contents

Ch 1 General Information ................................................................................................ 1
A. Scope ...............................................................................................................................................................2
B. purpoSe ............................................................................................................................................................2
c. InStructIon BulletInS AvAIlABle electronIcAlly ....................................................................................................2
Ch 2 Safety .......................................................................................................................3
A. SAfe Work condItIon .........................................................................................................................................3
B. SAfety GuIdelIneS ...............................................................................................................................................3
c. GenerAl ............................................................................................................................................................4
d. SpecIfIc .............................................................................................................................................................4
e. SAfety lABelS ....................................................................................................................................................4
Ch 3 Equipment Description ............................................................................................ 5
A. GenerAl ............................................................................................................................................................5
B. prImAry compArtment ........................................................................................................................................5
c. SecondAry compArtment ....................................................................................................................................9
d. BreAker removABle element ...............................................................................................................................9
e. BreAker lIft truck .......................................................................................................................................... 10
f. rAtInGS .......................................................................................................................................................... 10
G. lIGhtInG ImpulSe WIthStAnd (BIl) .................................................................................................................... 10
h. cIrcuIt BreAker rAckInG mechAnISm ................................................................................................................. 10
I. remote rAckInG .............................................................................................................................................. 11
J. prImAry dISconnect devIceS ............................................................................................................................ 11
k. BuS compArtment ........................................................................................................................................... 12
l. current trAnSformer compArtment ................................................................................................................. 12
m. prImAry termInAtIon SpAce .............................................................................................................................. 12
n. voltAGe trAnSformerS .................................................................................................................................... 13
o. current-lImItInG fuSeS And control poWer trAnSformer .................................................................................. 13
p. dummy removABle element (type pvd) ........................................................................................................... 13
Q. Ground And teSt devIce .................................................................................................................................. 14
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01.4IB.67000
Contents
Ch 4 Installation ............................................................................................................. 15
A. GenerAl ......................................................................................................................................................... 15
B. receIvInG ........................................................................................................................................................ 15
c. hAndlInG ....................................................................................................................................................... 15
d. StorAGe ......................................................................................................................................................... 16
e. poSItIonInG the metAl-clAd SWItchGeAr ........................................................................................................... 17
1) Drawings and Diagrams .....................................................................................................................................................17
f. prepArAtIon of floor AnchorInG ..................................................................................................................... 23
1) Indoor Metal-Clad Switchgear ...........................................................................................................................................23
2) Outdoor Metal-Clad Switchgear .......................................................................................................................................26
3) Outdoor Switchgear with Protected Aisle .......................................................................................................................26
4) Outdoor Switchgear with Common Aisle ........................................................................................................................27
G. BreAker removABle element ............................................................................................................................ 30
h. teSt cABInet ................................................................................................................................................... 30
I. AddItIon of unItS to exIStInG eQuIpment ........................................................................................................... 30
1) Adding Units to Outdoor Equipment without a Protected Aisle ................................................................................ 30
2) Adding Units to Outdoor Equipment with a Protected/Common Aisle ................................................................... 31
J. InStructIonS for mAkInG BuS connectIonS AcroSS ShIppInG SplIt SectIonS .......................................................... 31
1) Introduction ............................................................................................................................................................................31
2) Main Bus Connections Across the Shipping Split ...........................................................................................................31
3) Tie Bus Connections Across the Shipping Split ............................................................................................................... 35
k. InStructIonS for BoltInG StAckS toGether AcroSS ShIppInG SplIt SectIonS ........................................................... 36
1) Introduction ............................................................................................................................................................................36
l. connectIonS ................................................................................................................................................... 38
1) Main Bus Bars ......................................................................................................................................................................... 38
2) Sliding Connections .............................................................................................................................................................. 39
m. mAIn BuS ASSemBly ......................................................................................................................................... 39
1) Wrapping of Joints ................................................................................................................................................................ 40
2) Cleaning Bus Insulation ....................................................................................................................................................... 43
n. prImAry cABleS ............................................................................................................................................... 43
o. InSulAtInG prImAry cABle termInAtIonS ............................................................................................................. 44
p. Ground fAult current trAnSformerS
(throuGh-type) .............................................................................................................................................. 45
Q. control cABleS .............................................................................................................................................. 47
r. Ground BuS ................................................................................................................................................... 47
S. SurGe protectIon ........................................................................................................................................... 47
t. roof entrAnce BuShInGS ................................................................................................................................. 48
u. teStInG And InSpectIon ..................................................................................................................................... 48
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
Contents
01.4IB.67000
Ch 5 Operation ............................................................................................................... 50
A. GenerAl ......................................................................................................................................................... 50
B. InSertInG the removABle element Into the compArtment .................................................................................... 50
c. BreAker rAckInG WIth front door cloSed ........................................................................................................ 52
d. remote rAckInG devIce .................................................................................................................................... 53
e. poSItIve Interlock ........................................................................................................................................... 53
f. neGAtIve Interlock .......................................................................................................................................... 53
G. SprInG dISchArGe Interlock ............................................................................................................................. 54
h. Interference Interlock ..................................................................................................................................... 55
I. cloSInG SprInG GAG Interlock .......................................................................................................................... 55
J. key lockS ...................................................................................................................................................... 57
k. pAdlockS ....................................................................................................................................................... 57
l. StAtIonAry AuxIlIAry SWItch ............................................................................................................................ 57
m. BreAker poSItIon SWItch .................................................................................................................................. 57
n. SpAce heAterS ................................................................................................................................................ 57
Ch 6 Maintenance ..........................................................................................................59
A. GenerAl ......................................................................................................................................................... 59
B. overAll mAIntenAnce procedureS .................................................................................................................... 59
1) Equipment ...............................................................................................................................................................................59
2) Bus Insulation ......................................................................................................................................................................... 59
3) Racking Mechanisms ...........................................................................................................................................................60
4) Primary Disconnect Device Contacts ...............................................................................................................................60
5) Disconnecting Contacts .......................................................................................................................................................60
6) Control Contacts ....................................................................................................................................................................60
7) Secondary Wiring ..................................................................................................................................................................60
8) Mechanical Parts ................................................................................................................................................................... 60
9) Ventilation ...............................................................................................................................................................................60
10) Battery and Charging Equipment .....................................................................................................................................61
11) Hardware .................................................................................................................................................................................61
12) Heaters ..................................................................................................................................................................................... 61
13) Testing ......................................................................................................................................................................................61
14) Abnormal Conditions ...........................................................................................................................................................62
15) Doors ........................................................................................................................................................................................ 62
Ch 7 Recommended Renewal Parts and Replacement Procedures ..............................63
A. orderInG InStructIonS ..................................................................................................................................... 63
B. recommended reneWAl pArtS .......................................................................................................................... 63
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01.4IB.67000

Figures

Figure 1 Typical Indoor Power/Vac® Metal-Clad Switchgear Lineup ..........................6
Figure 2 Typical Outdoor Power/Vac® Metal-Clad Switchgear Lineup .......................7
Figure 3 Interior Metal-Clad Switchgear (Lower Compartment) ................................ 8
Figure 4 Primary Disconnecting Device - 1200A .......................................................12
Figure 5 Primary Disconnecting Device - 3000A .......................................................12
Figure 6 Installation Details for Indoor Power/Vac® Metal-Clad Switchgear ...........18
Figure 7 Installation Details for Indoor Power/Vac® Metal-Clad
Switchgear (cont.) ........................................................................................19
Figure 8 Installation Details for Outdoor Power/Vac® Metal-Clad Switchgear ........20
Figure 9 Installation Details for Outdoor Power/Vac® Metal-Clad
Switchgear (cont.) ........................................................................................21
Figure 10 Installation Details for Outdoor Power/Vac® Metal-Clad Switchgear with
Protected Aisle .............................................................................................22
Figure 11 Typical Assembly Details .............................................................................24
Figure 12 Typical Assembly Details (cont.) ..................................................................25
Figure 13 Assembly of Outdoor Switchgear with Protected Aisle ...............................28
Figure 14 Assembly of Outdoor Switchgear with Protected Aisle - (cont.) .................29
Figure 15 Front Upper Compartment ..........................................................................32
Figure 16 View Looking Up Into Front Bottom Compartment of a 2-High .................32
Figure 17 Taptite Location in Front Upper Compartment ........................................... 32
Figure 18 View of Typical Front Lower Breaker Compartment ...................................32
Figure 19 View of Typical Front Lower PT/CPT Rollout Compartment ........................ 33
Figure 20 View of Main Bus Compartment from Front ...............................................33
Figure 21 Location of Tape ........................................................................................... 33
Figure 22 Typical Bus Compartment with Polyester Glass Inter-Unit Bus Support .... 34
Figure 23 View Showing Stacks Bolted Together ........................................................34
Figure 24 Single Bus Bar Arrangement ........................................................................35
Figure 25 Double Bus Bar Arrangement ...................................................................... 35
Figure 26 Typical Rear Tie Bus Compartment with Bus Barrier Removed ..................35
Figure 27 Sectional View of Inter-Unit Bolting ............................................................37
Figure 28 Typical Center Post Bolting ..........................................................................37
Figure 29 Ground Bus Splice Bolt Assembly ................................................................38
Figure 30 Insulation of Bus Bar .................................................................................... 40
Figure 31 Single Bus Bar Connection Joint .................................................................. 41
Figure 32 Double Bus Bar Connection Joint ................................................................41
Figure 33 Tee Connection Joint .................................................................................... 42
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
Figures
Figure 34 Dead End Bus Joint Insulation .....................................................................42
Figure 35 Installation of Primary Cables ..................................................................... 43
Figure 36 Cable Termination Joint ...............................................................................45
Figure 37 Rear View of Unit Showing Ground Fault Current Transformer .................. 46
Figure 38 Bar-Type Current Transformer Joint Insulation ..........................................46
Figure 39 Roof Bushing ................................................................................................48
Figure 40 Lift Truck .......................................................................................................52
Figure 41 Left Side Racking Rail ..................................................................................56
Figure 42 Right Side Racking Rail ...............................................................................56
Figure 43 Stationary Auxiliary Switch & Circuit Breaker Position Indicator ..............57
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01.4IB.67000

Tables

Table A Standard Dimensions ........................................................................................... 8
Table B Ratings of Medium Voltage Power/Vac Metal-Clad Switchgear .......................... 9
Table C Bolt Torque Values for Power/Vac® Medium Voltage Metal-Clad Switchgear ..39
Table D Bus Wrapping Components ...............................................................................40
Table E Insulation of Bus Bar ........................................................................................... 40
Table F Insulation of Single Bus Bar Connection Joint ................................................... 41
Table G Insulation of Double Bus Bar Connection Joint .................................................41
Table H Insulation of Tee Connection Joint ....................................................................42
Table I Insulation of Dead End Bus Joint .........................................................................42
Table J Cable Termination Joint ......................................................................................45
Table K Bar-Type Current Transformer Joint Insulation ................................................. 46
Table L Pothead, Bushing, or Terminator .......................................................................48
Table M Accessories ......................................................................................................... 64
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
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01.4IB.67000
WARNING
WARNING
NOTICE
NOTICE

Ch 1 General Information

!
The equipment described in this document may contain high voltages and currents which can cause death or serious injury.
The equipment is designed for use, installation, and maintenance by knowledgeable users of such equipment having experience and training in the field of high voltage electricity. This document and all other documentation shall be fully read, understood, and all warnings and cautions shall be abided by. If there are any discrepancies or questions, the user shall contact Powell immediately at 1.800.480.7273.
!
Prior to adjustments, servicing, maintenance, or any act requiring the operator to make physical contact with the equipment, the power source must be disconnected and the equipment grounded. Failure to do so may result in death or serious injury.
The information in this instruction bulletin is not intended to explain all details or variations of the Powell equipment, nor to provide for every possible contingency or hazard to be met in connection with installation, testing, operation, and maintenance of the equipment. For additional information and instructions for particular problems, which are not presented sufficiently for the user’s purposes, contact Powell at 1.800.480.7273.
Powell reserves the right to discontinue and to change specifications at any time without incurring any obligation to incorporate new features in products previously sold.
General Information
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
WARNING
NOTICE
01.4IB.67000

A. SCOPE

The information in this instruction bulletin describes the following Power/Vac® metal-clad switchgear assemblies:
• 5kV & 15kV
• 20kA, 25kA, 31.5kA, 40kA, 50kA, & 63kA
• 1200A, 2000A, 3000A, 3500A, & 4000A FC
Standard construction details are provided in the appropriate sections. The circuit breaker element operation and maintenance instructions can be found in the circuit breaker operating instruction manual provided with each circuit breaker. Any special switchgear construction details are provided in supplementary documentation.

B. PURPOSE

The information in this instruction bulletin is intended to provide details required to properly operate and maintain the Power/Vac metal-clad switchgear described in
Ch 1 General Information, A. Scope.
The illustrations contained in this document may not represent the exact construction details of each particular type of metal-clad switchgear. The illustrations in this document are provided as general information to aid in showing component locations only.
All illustrations and photos are shown using deenergized equipment.
!
Follow the appropriate safety precautions while handling any of the equipment. Failure to do so may result in death or serious injury.
To the extent required, the products described herein meet the applicable ANSI, IEEE, and NEMA Standards; however, no such assurance is given with respect to local codes and ordinances which may vary greatly.

C. INSTRUCTION BULLETINS AVAILABLE ELECTRONICALLY

This instruction bulletin provides:
1. Safety guidelines
2. General descriptions of the operation and maintenance of the Power/Vac metal-clad switchgear
3. Instructions for installation and placing the switchgear into service
4. Instructions for part replacement
4. Information for ordering renewal parts
5. Illustrations, photographs, and description of the switchgear
2
Changes to the instruction bulletin may be implemented at any time and without notice. Go to powellind.com to ensure use of the current instruction bulletin for Powell equipment.
For more information visit powellind.com. To contact the Powell Service Division call
1.800.480.7273 or 713.944.6900, or email
info@powellservice.com.
For specific questions or comments pertaining to this instruction bulletin email
documents@powellind.com.
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General Information
01.4IB.67000

Ch 2 Safety

A. SAFE WORK CONDITION

The information in Section A is quoted from
NFPA 70E 2012 - Article 120, 120.1 Establishing an Electrically Safe Work Condition.
120.1 Process of Achieving an Electrically Safe
Work Condition
1. Determine all possible sources of electrical supply to the specific equipment. Check applicable up-to-date drawings, diagrams, and identification tags.
2. After properly interrupting the load current, OPEN the disconnecting device(s) for each source.
3. Wherever possible, visually verify that all blades of the disconnecting devices are fully OPEN or that drawout type circuit breakers are withdrawn to the fully disconnected position.
4. Apply lockout/tagout devices in accordance with a documented and established policy.
5. Use an adequately rated voltage detector to test each phase conductor or circuit part to verify they are deenergized. Test each phase conductor or circuit part both phase-to-phase, and phase-to-ground. Before and after each test, determine that the voltage detector is operating satisfactorily.
Informational Note: See ANSI/ISA-61010-1 (82.02.01)/UL 61010-1, Safety Requirements
for Electrical Equipment for Measurement, Control, and Laboratory Use - Part 1: General Requirements, for rating and design
requirements for voltage measurement and test instruments intended for use on electrical systems 1000 V and below.
6. Where the possibility of induced voltages or stored electrical energy exists, ground the phase conductors or circuit parts before touching them. Where it could be reasonably anticipated that the conductors or circuit parts being deenergized could contact other exposed energized conductors or circuit parts, apply ground connecting devices rated for the available fault duty.

B. SAFETY GUIDELINES

Study this instruction bulletin and all other associated documentation before installing the switchgear.
Each user has the responsibility to instruct and supervise all personnel associated with usage, installation, operation, and maintenance of this equipment on all safety procedures. Furthermore, each user has the responsibility of establishing a safety program for each type of equipment encountered.
The circuit breakers used in the metal-enclosed switchgear described in this instruction bulletin are operated by a high-energy, high-speed mechanism that is interlocked to provide specific operating sequences. It is mandatory that the following rules be observed to ensure the safety of personnel associated with usage, installation, operation, and maintenance of these circuit breakers.
The safety rules in this instruction bulletin are not intended to be a complete safety program. The rules are intended to cover only some of the important aspects of personnel safety related to Power/Vac® metal-clad switchgear.
Safety
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
NOTICE
01.4IB.67000

C. GENERAL

1. Only supervised and qualified personnel trained in the usage, installation, operation, and maintenance of the switchgear shall be allowed to work on this equipment. It is mandatory that this instruction bulletin, any supplements, and service advisories be studied, understood, and followed.
2. Maintenance programs must be consistent with both customer experience and manufacturer’s recommendations, including service advisories and instruction bulletin(s). routine maintenance program is essential for circuit breaker’s reliability and safety.
3. Service conditions and circuit breaker applications shall also be considered in the development of safety programs. Variables include ambient temperature; humidity; actual continuous current; thermal cycling; number of operations; interrupting duty; and any adverse local conditions including excessive dust, ash, corrosive atmosphere, vermin and insect infestations.

D. SPECIFIC

1. DO NOT WORK ON ENERGIZED SWITCHGEAR. If work must be performed
on the switchgear, remove it from service and place it in an electrically safe condition.
A well planned and executed
serviced only by skilled and knowledgeable personnel capable of releasing each spring load in a controlled manner. Detailed information regarding these mechanisms is found in the circuit breaker instruction bulletin.
4. DO NOT ATTEMPT TO CLOSE THE CIRCUIT
BREAKER MANUALLY ON AN ENERGIZED CIRCUIT.
5. DO NOT USE AN OPEN CIRCUIT BREAKER AS THE SOLE MEANS OF ISOLATING A HIGH VOLTAGE CIRCUIT. For complete
isolation, the circuit breaker shall be in the disconnected position or shall be withdrawn completely.
6. ALL COMPONENTS SHALL BE
DISCONNECTED BY MEANS OF A VISIBLE BREAK AND SECURELY GROUNDED FOR SAFETY OF PERSONNEL PERFORMING MAINTENANCE OPERATIONS ON THE SWITCHGEAR.

E. SAFETY LABELS

The equipment described in this document has DANGER, WARNING, CAUTION, and instruction labels attached to various locations. All equipment DANGER, WARNING, CAUTION, and instruction labels shall be observed when the circuit breaker is handled, operated, or maintained.
2. DO NOT WORK ON THE SWITCHGEAR WITH THE CONTROL CIRCUIT ENERGIZED.
3. EXTREME CARE MUST BE EXERCISED
TO KEEP ALL PERSONNEL, TOOLS, AND OTHER OBJECTS CLEAR OF MECHANISMS WHICH ARE TO BE OPERATED, DISCHARGED, OR RELEASED. These
circuit breakers utilize stored energy mechanisms. These mechanism must be
4
Warning and Caution labels are located in various places. Do NOT remove or deface any of these warning/caution labels.
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Safety
01.4IB.67000
NOTICE

Ch 3 Equipment Description

A. GENERAL

Powell is committed to continuous product improvement. It is possible that improvements occurred between revisions to this document and therefore, may not be described in these instructions. If the equipment does not resemble the photographs and descriptions contained herein, do not attempt to perform the actions. Contact the Powell Service Division.
Power/Vac® Metal-Clad Switchgear equipped with vacuum circuit breakers is designed to comply with ANSI Standard C37.20.2.
Metal-Clad switchgear is characterized by removable interrupting devices, isolation of major circuit elements, grounded metal compartments, and insulated primary bus conductors. The metal-clad switchgear is a line-up of one or more switchgear vertical sections known as units, which are enclosed on all sides except for the ventilation openings and lower unit cable penetrations.
This instruction bulletin should be used in conjunction with the appropriate instructions for Vacuum Circuit Breakers, including any applicable supplement(s), separate instructions covering other components of the metal-clad switchgear, and applicable drawings because each metal-clad switchgear line-up is custom designed for a particular use and application. Separate instructions covering other components are not included in this publication, but are available upon request.

B. PRIMARY COMPARTMENT

The primary compartment contains the high voltage equipment and connections. It consists of the breaker compartments, bus compartment, cable termination compartment, and auxiliary compartments for voltage and control power transformers. Each of these compartments is separated from the others by metal barriers for reliability and safety.
Interference interlocks are provided on the metal-clad switchgear to permit only the circuit breaker with the correct voltage, continuous current, MVA and momentary rating to be inserted.
The metal-clad switchgear is used to protect and control medium voltage alternating current power distribution systems. Each unit consists of a number of circuit breaker compartments, plus auxiliary compartments containing accessory apparatus. The circuit breakers are used to control various types of circuits, such as incoming lines, bus ties, feeders, and motor starters. Also, special functions are provided in great variety and may be required for particular applications.
Figure 1 illustrates a typical Power/Vac
metal-clad switchgear line-up.
Equipment Description
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV

Figure 1 Typical Indoor Power/Vac® Metal-Clad Switchgear Lineup

01.4IB.67000
6
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Equipment Description
01.4IB.67000

Figure 2 Typical Outdoor Power/Vac® Metal-Clad Switchgear Lineup

Equipment Description
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV

Table A Standard Dimensions

01.4IB.67000
Configuration
One-High 1200, 2000, 3000 20, 25, 31.5, 40, 50 & 63 95 94
Two-High 1200, 2000 20, 25, 31.5 40,, 50 & 63 95 94
One- High 3500 20, 25, 31.5 40,, 50 & 63 95 106
One-High 4000 Force Cooled 20, 25, 31.5 40,, 50 & 63 106 106
Continuous Current
Rating (Amperes)
Short-Circuit Rating
(kA)

Figure 3 Interior Metal-Clad Switchgear (Lower Compartment)

Height
(inches)
Depth
(inches)
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Equipment Description
01.4IB.67000

Table B Ratings of Medium Voltage Power/Vac Metal-Clad Switchgear

5kV
Maximum
Voltage
Nominal Voltage
4.76 4.16 19 60
7.2kV - 15kV
Maximum
Voltage
Nominal Voltage
15.0 13.8 36 95
Power Frequency
Withstand
(kV)
Power Frequency
Withstand
(kV)
BIL
Crest
(kV)
BIL
Crest
(kV)
Main Bus
Continuous
Current
(A rms)
1200, 2000, 3000, 3500,
4000 FC
Main Bus
Continuous
Current
(A rms)
1200, 2000, 3000, 3500,
4000 FC
Symmetrical short-circuit
Rating
(kA rms)
Short Time
Current
2 sec.
(kA)
40 40 97
50 50 135
63 63 170
Symmetrical short-circuit
Rating
(kA rms)
Short Time
Current
2 sec.
(kA)
20 20 52
25 25 67
36 36 97
50 50 135
63 63 170
Momentary
withstand Rating
(kA Crest)
Momentary
withstand Rating
(kA Crest)

C. SECONDARY COMPARTMENT

The secondary compartment is located in the front of the equipment where the circuit breaker is withdrawn. The compartment is provided with a hinged panel upon which are mounted the necessary instruments, control and protective devices. The terminal blocks, fuse blocks, and some control devices are mounted inside the compartment on the side sheets and on the internal device panel. A wiring space is provided across the top of the switchgear to run wires between vertical sections.

D. BREAKER REMOVABLE ELEMENT

The Power/Vac® circuit breaker is a vacuum type circuit breaker. It is designed to meet all the requirements for use in metal-clad switchgear and as such it has all the necessary interlocks and grounding to interface with the switchgear. It is a removable device, designed with wheels that make insertion and removal from the compartment a simple operation. All circuit breakers with equal ratings are interchangeable.
For a detailed description of the circuit breaker and its operation refer to the appropriate instruction bulletin for Power/Vac vacuum circuit breakers.
Equipment Description
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Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000

E. BREAKER LIFT TRUCK

For ease of breaker handling during installation and removal, a breaker lift truck is furnished as a standard accessory with each Power/Vac switchgear order. This accessory device is used to elevate the breaker from the floor or working platform to the level of the tracks in the switchgear compartment. Docking of the lifting device rails to the switchgear tracks is provided for maximum safety. Refer to Ch 5 Operation, B. Inserting
the Removable Element into the Compartment,
or the latest version of Instruction Bulletin
01.4IB.66000.

F. RATINGS

Ratings of Power/Vac switchgear and circuit breakers are based on factors supplied in the following:

G. LIGHTING IMPULSE WITHSTAND (BIL)

The basic impulse level is 60kV for the 4.16kV class switchgear and 95kV for the 8.25kV and
13.8kV class switchgear. The basic impulse level testing excludes control transformers, starting reactors, and autotransformers.
Note: If required, AC Field Dielectric Tests
should be limited to 75% of Factory Dielectric Test values. Direct current dielectric testing is not recommended. If DC testing is required, see
Ch 4 Installation, U. Testing and Inspection for values to be used.

H. CIRCUIT BREAKER RACKING MECHANISM

The circuit breaker may be placed in three distinct positions within the circuit breaker compartment of the switchgear:
• ANSI C37.04 Circuit Breaker Rating Structure
• ANSI C37.06 Circuit Breaker Ratings
• ANSI C37.20.2 Switchgear Assemblies
See Table B, Ratings of Medium Voltage
Power/Vac® Metal-Clad Switchgear for complete
ratings.
Note: Certain non-standard ratings are
available for special applications. Consult the manufacturer for details. Refer to the specific job drawings for detailed voltage ratings applicable to particular switchgear line-up.
• Disconnected Position
• Test Position
• Connected Position
In the “disconnected position” the movable primary disconnects of the circuit breaker are disengaged and separated at a safe distance from the stationary primary disconnecting devices located in the compartment. A metal shutter covers the openings of the stationary primary disconnecting devices which prevents contact. In this position, the secondary disconnect devices and control contacts are disengaged.
In the “test position”, the primary disconnecting devices are disengaged and the shutters are closed. The secondary circuits are completed by inserting the secondary disconnect plug (breaker) into the secondary disconnect receptacle of the switchgear compartment via the breaker mounted handle. Now the circuit breaker may be electrically operated without affecting the primary circuit.
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Equipment Description
01.4IB.67000
CAUTION
Note: At this time the circuit breaker is in
the same physical location as the “disconnected position”.
In the “connected position”, the movable primary disconnecting circuits and stationary primary disconnecting circuits are engaged. The shutters are open and the secondary circuits and control contacts are completed.
Interlocks deter the movement of a circuit breaker from one position to another unless the circuit breaker is tripped open. The interlocks also deter closing the breaker between positions.
For complete instructions on inserting and withdrawing the circuit breaker in and out of the switchgear, see Ch 5 Operation of this bulletin and also refer to the applicable Power/Vac® circuit breaker instruction bulletin.
!
If the circuit breaker main closing spring is charged, withdrawing the secondary disconnect plug will cause this main closing spring to discharge.
grounded receptacle or extension cord. The 230VAC, 50/60Hz model has a three wire four foot cord to which the purchaser applies his standard plug.
The remote racking device is provided with a two position directional switch, an “On-Off” circuit breaker and a push button control box attached with a 30 foot extension cord.
Refer to the specific instruction bulletin for remote racking instructions.

J. PRIMARY DISCONNECT DEVICES

The 1200A and 2000A primary disconnects consist of two rows of silver-plated copper fingers mounted on either side of the circuit breaker studs. These fingers are held in place with a spider which positions the fingers and fastens them to the breaker. Wipe pressure is obtained by tension springs between the rows of fingers which pull them together. When the circuit breaker is connected to the metal-clad studs, the spring force on the fingers is divided between the breaker stud and metal-clad studs
(Figure 4).

I. REMOTE RACKING

The optional electrically operated racking device provides a convenient means for racking a breaker between the connected and test positions from a remote location. It is easily mounted to the breaker compartment front door and is designed for quick transfer between units.
The remote racking device is furnished in two operating voltage versions. The 115VAC, 50/60Hz model has a four foot electrical cord with standard three prong plug to fit a
Equipment Description
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11
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
CAUTION
01.4IB.67000
Figure 4 Primary Disconnecting Device -
1200A
a
a. Primary Disconnecting Device
On 3000A primary disconnects, silver-plated copper fingers are positioned in a circular configuration and are supported by a non-magnetic spider. This spider spaces the fingers equally around the breaker stud and fastens them to the end of the stud. The fingers are held in contact with the breaker stud by a stainless steel garter spring. A second garter spring on the outer end of the finger provides contact pressure when the finger assembly is connected to the tube in the metal-clad unit (Figure 5).
Figure 5 Primary Disconnecting Device -
3000A

K. BUS COMPARTMENT

The main buses are enclosed in a metal compartment with removable front covers to provide accessibility. The bus is supported and insulated by molded glass-reinforced polyester barriers which are flame retardant and track resistant. Polyester supports with porcelain sleeves may be furnished as an option in 5kV and 15kV equipment.
Bus bars are insulated with an extruded thermoplastic insulation sleeving or an applied epoxy insulation using the fluidized bed process. All bolted joints have silver-to-silver connections for low contact resistance. Most joints are insulated with a molded polyvinyl chloride boot.

L. CURRENT TRANSFORMER COMPARTMENT

Current transformers are mounted over the primary bushings in the rear of the breaker compartment and are isolated from the breaker by the shutter barrier. They are front accessible by removal of the shutter barrier.
!
The equipment must be deenergized before any component is touched or serious injury could result.
a
a. Primary Disconnecting Device
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M. PRIMARY TERMINATION SPACE

The primary termination space of each breaker unit is isolated from the other equipment by metal barriers. Space is provided in this compartment for connecting the customer’s primary cable by means of potheads or clamp type terminals. Two-hole NEMA drilling for two cables per phase is provided at all cable connection points.
®
Equipment Description
01.4IB.67000
WARNING
In double breaker vertical sections, a steel duct serves as a pull-box and barrier to separate the two outgoing cable circuits.
The primary termination space of a unit is accessible by removal of the bolted rear cover.

N. VOLTAGE TRANSFORMERS

The voltage transformers are mounted on a rollout carriage equipped with primary and secondary disconnecting devices. When the voltage transformers are disconnected, they are at a safe striking distance from all live parts of the metal-clad switchgear. In addition, a grounding device is provided which contacts the fuses when the voltage transformers are disconnected, effectively discharging the transformers. In this position, the transformer fuses may be safely removed and replaced. When the voltage transformer rollout tray is in the disconnected position, the rear barrier of the tray effectively deters access to the stationary primary disconnects mounted in the compartment behind the rollout tray. However, these stationary primary disconnects may remain energized.
O. CURRENT-LIMITING FUSES AND CONTROL POWER
TRANSFORMER
Current limiting fuses with high interrupting rating are sometimes used in metal-clad switchgear to protect small transformers or circuits where circuit breakers cannot be economically or functionally justified.
compartment behind their associated fuse carriage and their secondary breaker is located behind a hinged cover on the upper cable compartment.
!
Do not remove the rollout tray from its rails without first deenergizing the primary circuit to which the roll-out connects. Removing the tray makes the stationary primary disconnect devices accessible.
When fuses are disconnected, they are at a safe striking distance from all live parts of the switchgear. In addition, a grounding device is provided which contacts the fuses after they are disconnected, effectively removing any static charge from the fuses. In this position, the fuses may be safely removed and replaced. The primary disconnecting devices are capable of interrupting transformer magnetizing current, but should not be used to interrupt load current. Mechanical or key interlocks are applied to prevent operating the disconnecting device while the load is connected. This is generally accomplished by interlocking so that the transformer secondary breaker must be locked in the open position before the disconnecting device can be connected or disconnected.
Current-limiting fuse and control power transformer rollouts are located in auxiliary units.
The fuses are mounted on a moveable carriage equipped with primary and secondary disconnecting devices. Single phase control power transformers of 15kV and smaller and their secondary breaker are mounted on the carriage with the fuses. Larger control power transformers, up to 37.5kV single-phase or 75kV three-phase , are located in the cable
Equipment Description

P. DUMMY REMOVABLE ELEMENT (TYPE PVD)

Dummy removable elements are used as a means of isolating circuits or bus sections where operation is infrequent and a circuit breaker cannot be economically justified. The device consists of a circuit breaker mechanism frame and primary insulator supports with six primary studs including disconnecting
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