SECTION 26 18 39
MEDIUM VOLTAGE CONTROLLERS
PART 1 - GENERAL
1.1 SCOPE
A. This Section includes NEMA Class E2 medium voltage metal-enclosed motor controllers with fused power assemblies and medium voltage motor controllers with drawout-type construction.
1.2 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.
1.3 SUBMITTALS
A. Submit shop drawings and product data for approval and final documentation in the quantities listed according to the Conditions of the Contract. All transmittals shall be identified by purchaser name, purchaser location and purchaser order number.
B. Documents for Approval: Dimensioned plans, sections and elevations showing minimum clearances, installed devices, major features, nameplate legends and bills of material.
C. Final Documents: Record documentation to include those documents listed in 1.3.B and wiring diagrams and three-line diagrams, product data of accessories or parts not previously described in the drawings, list of recommended spare parts, and instruction and installation manuals
D. Product Data: Include features, characteristics and ratings of individual contactors, fuse assemblies and other components. Also include time-current characteristic curves for power fuses and overcurrent protective devices.
E. Shop Drawings: General arrangement drawing showing dimensioned plan, elevation, and details, including required clearances and service space around equipment. Show tabulations of installed devices, equipment features and ratings. Include the following:
1. Enclosure types and details.
2. Nameplate legends.
3. Bus configuration with size and number of conductors in each bus run, including phase and ground conductors of main and feeder buses.
4. Current rating of buses.
5. Short-circuit current rating of controller assembly.
6. Wiring Diagrams: Diagram power, signal and control wiring including differentiation between manufacturer-installed and field-installed wiring.
1.4 RELATED STANDARDS
A. Comply with requirements of latest revisions of applicable industry standards, specifically including the following:
1. UL 347 - Medium Voltage Controllers
2. NEMA ICS 3-2000, Part 1 – Medium Voltage Controllers
1.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: Engage a firm with at least 15 years experience in manufacturing Class E2 controllers.
1.6 DELIVERY, STORAGE AND HANDLING
A. Deliver products in factory labeled packages. Shipping groups shall not exceed 12 ft. in length.
B. Store and handle in strict compliance with manufacturer’s instructions and recommendations. Protect from potential damage from weather and construction operations. Store so condensation will not form on or in controller, and if necessary, apply temporary heat where required to obtain suitable service conditions.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A. [The medium voltage controller assembly shall be manufactured by Siemens or pre-approved equal. Approved manufacturers are as follows:
1. Siemens
2. . ]
2.2 RATINGS
A. [System Configuration: Controller assembly suitable for application in three-phase, three-wire [60Hz] [50Hz], [grounded] [ungrounded] system. ]
B. [Electrical Ratings
1. Nominal System Voltage, kV: [2.3] [4.16] [6.6].
2. Maximum Design Voltage, kV: [2.4] [4.8] [7.2].
3. Frequency: [60Hz] [50Hz]
4. Horizontal bus continuous amperes: [1000] [1200] [2000] [3000].
5. Vertical bus continuous amperes: [as required for equipment arrangement]
6. Ground bus size: ¼ by 2 inches
2.3 GENERAL REQUIREMENTS
A. The controller shall be factory assembled and tested and comply with applicable industry standards. It shall be a coordinated design so that shipping groups are easily connected together at the site into a continuous lineup. Necessary connecting materials shall be furnished. Bus splice plates and hardware shall ship installed in the equipment to prevent loss during shipment. All contactors and assemblies shall be produced by a single manufacturer in an ISO-9000 certified facility.
B. [The controller assembly shall be UL listed where arrangement and device selection allows.]
C. The controller assembly shall consist of one or more metal-enclosed sections in an [indoor NEMA 1] [indoor NEMA 1 gasketed] [indoor NEMA 2] [indoor NEMA 12] [outdoor NEMA 3R] enclosure.
D. Individual vertical sections shall be three-high to accommodate drawout controller assemblies without de-rating and shall include:
1. Fabricated of minimum 11 gauge steel for the frame, minimum 12-gauge for doors. Typical dimensions shall be [90”] [100” for top-mounted bus] {104” for 3000A bus] high, 36” wide and 36” deep.
2. End sections shall include provisions for main bus extension and installation of future vertical sections.
3. The design shall incorporate preformed steel channels, angles and side sheets bolted together and reinforced to form a rigid, self-supporting assembly.
E. Fabricate with dead-front construction utilizing sheet steel barriers for isolation of the power bus compartments from the drawout controller area. Include sliding shutter mechanism to automatically cover the line side stab connections whenever the controller drawout carriage is racked off the bus. The rear of each section to be provided with a two-piece removable steel sheet barrier for access.
F. Power (horizontal) bus shall connect vertical sections and between compartments and shall not be tapered.
1. Bus shall be [98% minimum conductivity copper with silver-plated joints] [98% conductivity copper with tin-plated joints]
2. Ground Bus shall be copper of 98% minimum conductivity, with pressure connector for feeder and branch-circuit ground conductors, minimum size 1/4 by 2 inches.
3. Busbars shall be bare, except where clearance considerations require that the bus be insulated. [OPTIONAL: Busbar insulation shall be heat shrink sleeving. Bolted bus joints requiring insulation shall be insulated with secure joint covers that can easily be removed and reinstalled.]
G. Vertical bus to be provided in sections housing drawout controllers.
H. Finish: Steel parts shall be prepared for painting by a five-stage wash system consisting of an alkaline cleaner, fresh water rinse, iron phosphate treatment, fresh water rinse and non-chromate sealer. After cleaning and stabilization, the steel parts shall be coated with a thermosetting polyester urethane powder applied with electrostatic equipment at a nominal 2 mils dry film thickness and then cured properly. The paint finish shall have a pencil hardness of 2H, a salt spray rating as defined in ASTM B-117 of 600 hours. Paint color shall be ANSI light gray.
I. [NOTE: Select one of the next two paragraphs. Either Walk-In or Non-Walk-In] [Outdoor Walk-In Single Aisle. Single Aisle design shall consist of indoor type controller assembly located in a weather-proof steel housing having an operating aisle space of sufficient size to permit withdrawal of the contactor for inspection, test and maintenance. Included shall be the following:
1. Outdoor enclosure: Painted steel enclosure (using the same paint system as described above in paragraph H), weatherproof construction; integral structural-steel base frame with factory-applied asphalt undercoating; and equipped with the following features:
2. [Adequate incandescent lighting receptacles controlled by means of a three-way wall switch at each access door][Fluorescent aisle lights with low-temperature ballasts, controlled by a three way wall switch at each access door.]
3. Space heaters sized to prevent condensation in each vertical section.
4. Louvers equipped with insect/rodent screen and filter and arranged to permit air circulation while excluding exterior dust and rodents.
5. Common internal aisle of sufficient width to drawout contactor withdrawal, disassembly and servicing in aisle.
6. Aisle access doors at each end with outside padlocking provisions and interior panic latches.
7. Two duplex receptacles with integral ground fault protection, one at each aisle access door.]
J. [Outdoor Non-Walk-In Enclosure. Non-walk-in design shall consist of indoor controller assemblies located in a weather-proof painted steel enclosure (using the same paint system as described above in paragraph H), with structural-steel base frame and factory-applied asphalt undercoating; and equipped with the following features:
1. Each unit equipped with an exterior full height hinged front door with provision for padlocking and interior cell hinged doors.
2. Space heater sized to prevent condensation in each vertical section.
3. One lamp receptacle with on-off switch in each unit.
4. One utility duplex receptacle with integral ground fault protection in each unit.
2.4 COMPONENTS
A. Instrument Transformers: Comply with IEEE C57.13.
1. Voltage Transformers: Secondary-voltage rating of 120 V and accuracy class of 0.3 WX, 0.6 Y.
2. Current Transformers: Ratios as indicated; burden and accuracy class suitable for connected relays, meters and instruments.
B. Multifunction Digital-Metering Monitors shall be UL-listed or UL-recognized, microprocessor-based unit. Units shall be flush mounted on the instrument compartment door and be Siemens Model 9300 or equal.
C. [NOTE: Select clause C if a microprocessor motor protection relay is desired in place of the standard ambient-compensated thermal overload relay]. Motor protection device shall be:
1. The relays shall be Siemens 7SK80 protective relay or equivalent. The relay shall provide the following protection functions: 50/51, 50N/51N, 67N, 67Ns, 50Ns, 59N/64, 37, 48, 66, 14, 51M, 49, 46, 27, 59, 81O/U, 50BF, 46, and 47.
2. The relays shall have four analog CT inputs and three voltage inputs.
3. The relays shall have five internal RTD inputs.
4. The relays shall have the option to connect 12 external RTD inputs through an Ethernet connection.
5. The relays shall provide trip circuit supervision of the feeder circuit breaker and alarm on trip circuit failure.
6. The relays shall monitor the CT circuits and alarm on circuit failure.
7. The relays shall be capable of being used in a reverse interlocking bus protection scheme.
8. The relay shall provide logic programmability to create starting schemes for example reduced voltage starting.
9. The relay shall provide logic programmability to create failsafe tripping logic.
10. The relays shall be capable of being used in a reverse interlocking bus protection scheme.
11. The relays shall provide demand alarms.
12. The relays shall have nine programmable function keys to replace control switches.
13. The relays shall have programmable logic capabilities to permit use in protection and control systems. Programming software must be compliant with IEC 1131 standard for PLC programming.
14. The relays shall have a modular communications processor to permit field change between IEC61850, Modbus RTU, Profibus-DP, DNP3.0 and IEC60870-5-103 protocols. The relays must be able to support either RS-485 or fiber optic communications.
15. The relays shall provide complete sequence-of-events recording, time stamped in milliseconds. The relays shall provide oscillography (waveform) capture, with configurable pre- and post-fault data capture times.
16. The relays shall recognize and alarm CT open circuit or short circuit conditions.
17. All relay connectors including CT connectors will be pluggable to ensure ease of relay replacement and maintenance testing.
18. The housing must be a sealed dust proof environment for the relay internal electronics. Heat build up must be dissipated through the surface area of the steel enclosure. The relay thus will maintain its tested insulation characteristic standards per IEC, IEEE, even if deployed in harsh dusty environments.
19. The relay must provide 20 flexible functions that can be used to create additional protection functions to maximize application flexibility.
D. [NOTE: Select clause D if non-motor feeders are included.] Feeder overcurrent protection with communication shall be the following:
1. The relays shall be Siemens 7SJ80 protective relay or equivalent. The relay shall provide the following protection functions: 50/51, 50N/51N, 67, 67N, 64, 87N, 37, 49, 46, 27, 59, 81O/U, 50BF, 46, 47, 25, 79, 21FL.
2. The relays shall have four analog CT inputs and three voltage inputs.
3. The relays shall provide trip circuit supervision of the feeder circuit breaker and alarm on trip circuit failure.
4. The relays shall monitor the CT circuits and alarm on circuit failure.
5. The relays shall be capable of being used in a reverse interlocking bus protection scheme.
6. The relays shall provide demand alarms.
7. The relays shall have nine programmable function keys to replace control switches.
8. The relays shall have programmable logic capabilities to permit use in protection and control systems. Programming software must be compliant with IEC 1131 standard for PLC programming.
9. The relays shall be capable of being used in a reverse interlocking bus protection scheme.
10. The relays shall have a modular communications processor to permit field change between IEC61850, Modbus RTU, Profibus-DP, DNP3.0 and IEC60870-5-103 protocols. The relays must be able to support either RS-485 or fiber optic communications.
11. The relays shall provide complete sequence-of-events recording, time stamped in milliseconds. The relays shall provide oscillography (waveform) capture, with configurable pre- and post-fault data capture times.
12. The relays shall recognize and alarm CT open circuit or short circuit conditions.
13. All relay terminal blocks including CT blocks will be pluggable to ensure ease of relay replacement and maintenance testing.
14. The housing must be a sealed dust proof environment for the relay internal electronics. Heat build up must be dissipated through the surface area of the steel enclosure. The relay thus will maintain its tested insulation characteristic standards per IEC, IEEE, even if deployed in harsh dusty environments.
15. The relay must provide 20 flexible functions that can be used to create additional protection functions to maximize application flexibility.
E. Control Power Supply: Control power transformer supplying 120Vac control circuits are to be dry-type transformers with primary current limiting fuses.
1. Units rated 3 kVA and below shall be mounted on the drawout carriage.
2. Single-phase, [0.75] [2.0] [3.0] kVA.
2.5 [DRAWOUT CONTROLLER ASSEMBLY]
A. For 360A, main contactor shall be drawout type, with primary current limiting fuses mounted on the same drawout carriage. For 720A, the main contactor shall be fixed-mounted, and the primary current limiting fuses shall be mounted on a drawout carriage, with interlocking as required between the contactor and the drawout carriage. Each controller shall consist of a [magnetically held][mechanically latched] contactor [360] [720] ampere, primary fuses for short circuit protection and to include the following:
1. Overload relay as described in paragraph 2.4.C or 2.4.D as selected above.
2. Line and load side stab fingers to allow complete removal of the drawout unit without disconnecting the power cable. A glass polyester shutter shall automatically cover the line side stabs when the drawout carriage is racked out.