SECTION [26 18 39] [16349]
MEDIUM VOLTAGE CONTROLLERS
PART 1 - GENERAL
1.1SCOPE
A.This Section includes NEMA Class E2 medium voltage metal-enclosed motor controllers with fused power assemblies and drawout contactors.
1.2RELATED DOCUMENTS
A.Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.
1.3SUBMITTALS
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 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.
1.4RELATED 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
1.5QUALITY ASSURANCE
A.Manufacturer Qualifications: Engage a firm with at least 15 years experience in manufacturing Class E2 controllers.
1.6DELIVERY, 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
2.1MANUFACTURERS
A.[The medium voltage controller assembly shall be manufactured by Siemens or pre-approved equal. Approved manufacturers are as follows:
1.SIEMENS
2.. ]
2.2RATINGS
A.[System Configuration: Controller assembly suitable for application in three-phase, [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: [360] [540] [720]
6.Ground bus continuous amperes: 600
2.3GENERAL 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”]high, 36” wide and 36” deep. [The three-high structure with contactors in the two lower cells and LV devices in the upper cell are 90” high. Otherwise a 10” top hat is needed for the main bus.]
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 is racked off the bus. The rear of each section to be provided with a two-piece removable 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 percent 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. Busbar insulation shall be Raychem 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 rise, iron phosphate treatment, fresh water rise 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 Shelter Clad or Non-Walk-in][Outdoor Shelter-Clad 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 operating at one-half rated voltage, 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.
8.[Aisle heaters] [Exhaust fans] thermostatically controlled.
9.[Thermally insulated aisle for better control of internal conditions]
10.[Wall mounted HVAC unit]
11.[Exterior door area lighting consisting of halogen fixtures [photo cell operated]]
12.[Exterior rotating alarm light] ]
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 operating at one-half rated voltage, sized to prevent condensation in each vertical section.
3.Louvers equipped with insect/rodent screen and filter and arranged to permit air circulation while excluding exterior dust and rodents.
4.One lamp receptacle with on-off switch in each unit.
5.One utility duplex receptacle with integral ground fault protection in each unit.
6.A switch located in one cell to control all space heaters.]
2.4COMPONENTS
A.Instrument Transformers: Comply with IEEE C57.13.
1.Voltage Transformers: Secondary-voltage rating of 120 V and accuracy class of 0.3 with burdens of W, X and 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 -recognized, microprocessor-based unit suitable for three- or four-wire systems. Units shall be flush mounted on the instrument compartment door and be Siemens Model PAC3200 or equal.
C.Motor protection device shall be one of the following:
1.[Standard Bimetallic thermal overload relay, Siemens Type 3UA]
2.[Optional: Solid state relay, Siemens Type ESP100] [Solid state relay, Siemens Type 3RB, with ground fault protection]
3.[Optional: The relay shall be a Siemens SIMPRO-100 or equivalent. The relay shall provide the following protection functions: 50/50N, 49, 46, 47, 66, Load Jam, Load Loss.
a.The relay shall have optional voltage inputs to provide the following protection functions: 27, 59, 37, 55 and 81.
b.Option 1: The relay shall provide 11 internal RTD inputs. RTD inputs shall be programmable to type.
c.Option 2: The relay shall provide an optional external RTD module with 12 RTD inputs, connecting to the relay via fiber optic cable.
d.The relay shall provide Modbus RTU communications.
e.The relay shall provide motor start reports that include motor currents, voltages and motor thermal information. The relay shall store the 5 latest reports in non-volatile memory. The motor start reports shall be downloadable into computer spreadsheets for use in motor analysis.
f.The relay shall provide the 18 latest 30-day averages of motor start information. The motor trend information shall be downloadable into computer spreadsheets for motor analysis.
g.The relay shall provide an optional module to supply motor differential protection. This shall be a separate module with independent power supply. The module shall be Siemens 7SJ6025-5EB00-1FA0.
h.The relays shall provide complete sequence-of-events recording, time stamped every millisecond. The relays shall provide oscillography (waveform) capture, with configurable pre- and post-fault data capture times.]
4.[Motor differential protection shall not be included as a function of the motor protection. It shall be provided by a separate relay to facilitate improved protection.]
D.Feeder overcurrent protection with communication shall be the following:
1.The relays shall be Siemens 7SJ602x-xxxxx-xxxx or equivalent. The relay shall provide the following protection functions: 50/51, 50N/51N, 49 and 46.
2.The relays shall have four analog CT inputs.
3.The relays shall provide trip circuit supervision of the feeder breaker and alarm on trip circuit failure.
4.The relays shall be capable of being used in a reverse interlocking bus protection scheme.
5.The relays shall have a modular communications processor to permit field change between Modbus RTU, Profibus-DP and IEC60870-5-103 protocols. The relay must be able to support either RS-485 or fiber optic communications. The relays shall provide complete sequence-of-events recording, time stamped every millisecond. The relays shall provide oscillography (waveform) capture, with configurable pre- and post-fault data capture times.
E.Transformer overcurrent protection with communication shall provided by a feeder overcurrent relay per paragraph 2.04.D above and in addition the following shall be provided:
1.Transformer differential protection shall be provided by a Siemens 7UT512x-xGB11-xxA0 relay or equivalent.
2.The transformer differential relay shall have a through-fault restraint setting to prevent tripping due to high current external faults.
3.The relays shall provide complete sequence-of-events recording, time stamped every millisecond. The relays shall provide oscillography (waveform) capture, with configurable pre- and post-fault data capture times.
F.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, [.750] [2.0] [3.0] kVA.
2.5[DRAWOUT CONTROLLER ASSEMBLY]
A.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-E as selected above.
2.Line and load side stab fingers to allow complete removal of the drawout unit without disconnecting the power cable. Glass polyester shutters shall automatically cover the line side stabs when the controller is racked out.
3.Fuse assembly with minimum short circuit rating of 50 kA symmetrical. Fuses to be ANSI Class “R” (Class “X” for 57X size) for motor starting duty [Class E for transformer or capacitor feeder duty]. Fuses shall be Siemens Type FM or A720R or approved equal. Fuses shall be mounted as an integral part of the controller drawout assembly. Fuse pullers shall not be required. The operator shall not be required to reach inside the controller cubicle to remove or install power fuses.
4.Vacuum interrupter main contact design shall have a minimum electrical life of 250,000 operations. Feeler gauges shall not be required to check contact wear.
5.Contactor coils shall be dual rated AC/DC for 24-60VAC/DC or 110-250VAC/DC.
6.Single phase control power transformer as specified in paragraph 2.4.F.
7.The drawout carriage shall be equipped with a set of contact fingers connected to the CPT secondary. The contact fingers shall be arranged to ensure any load on the CPT is disconnected prior to the main power stabs disengaging. De-energizing the secondary of the CPT shall not depend on the operation of auxiliary contacts or cut-off switches.
8.Operating handle shall be equipped with padlock provisions.
9.The racking mechanism is to combine the following safety interlocks:
a.Prevent forward and back movement of the drawout carriage unless the contactor is de-energized or open.
b.Prevent the opening of the high voltage compartment door unless the drawout carriage is in the disconnect position.
c.Prevent the movement of the drawout carriage to or from the connected positionunless the high voltage compartment door is closed.
10.A test switch shall be provided to switch from run to test mode. This switch shall be located on the back side of the low voltage door. With the contactor racked out and the door opened, the test mode shall be selectable. It shall allow for maintenance and operation of the main contactor and low voltage control circuitry without requiring energizing the motor or disconnecting any load cables. An interlock shall be provided to prevent application of test power when the contactor is racked in.
11.A control receptacle shall be furnished that connects to the pre-wired auxiliary and coil contacts of the drawout controller carriage. It shall remain connected in the racked-out position to facilitate testing.
12.Externally visible red LED indicating light, illuminated when contactor is connected to bus.
13.Low voltage compartment with door-in-door construction shall be provided to provide access from the front.
a.Compartment to be isolated from high voltage compartments and house components including terminal blocks, overload relay, control wiring. Overload reset button to be in door.
b.Compartment shall house components including terminal blocks, overload relay and control wiring. Overload reset button shall be door mounted.
c.All control wiring within the assembly shall be continuous and shall terminate on each end at a suitable terminal block. Control wiring shall be No. 14 AWG minimum, stranded type SIS and shall be labeled at each end with sleeve-type wire markers.
d.Wire markers shall be machine imprinted with the wire name as indicated on the wiring diagrams.
e.Terminals shall be insulated locking fork or ring tongue type except where connecting to components that do not accept these terminations.
2.6UNITS REQUIRED
A.Incoming Line:Qty [__]
1.3 - [__]kV MCOV [station][intermediate][distribution] class surge arresters
2.3 Phase surge capacitors
3.[Set of [__]voltage transformers, rated [__V]
4.[Set of [__]current transformers, rated [__A]
5.[1 Microprocessor-based 3-phase and ground overcurrent relay, ANSI Device 50/51, 50/51N.]
6.[1 – Microprocessor-based meter]
7.[Space heater and thermostat]
8.[NOTE: Pick one of the next three (lugs, bus or close coupled).] [Set cable lugs _ per phase, [Clamp-type] [compression-type] [Cable terminators] [Pot-heads] for [__] type cable [__] size, [__] kV for [top] [bottom] entry.] [Provisions for connection to metal-enclosed bus rated [__] A.] [Provisions for close-coupled bus connection to switchgear.]
B.FVNR (Full Voltage Non-Reversing Squirrel Cage Motor Starters: Qty [__]
1.3-pole vacuum contactor
2.(3) Power current limiting fuses
3.Control power transformer, 0.75 kVA
4.Master control relay
5.Start/stop pushbutton
6.Ambient compensated thermal overload relay Siemens type 3RU11 or as specified in Para. 2.04.C-E above.
7.Externally mounted overload reset button
8.(3) Current transformers
9.Test switch and circuit
10.Contactor position indicator light
11.[Space heater and thermostat]
12.Set of cable lugs
13.Drawout carriage mechanism
C.FVR (Full Voltage Reversing Squirrel Cage Motor Starters:Qty [__]
1.A 3-pole main vacuum contactor
2.A 3-pole fixed forward vacuum contactor
3.A 3-pole fixed reversing vacuum contactor
4.(3) Power current limiting fuses
5.Control power transformer, 0.75 kVA
6.Master control relay
7.Forward/Off/Reverse pushbutton
8.Ambient compensating thermal overload relay Siemens type 3RU11 or as specified in Para. 2.04.C-E above.