Description
This is a Notice of Intent to award the Seed Project task order under an existing Indefinite Delivery Indefinite Quantity Contract to The Ranger Group LLC. This task order will be awarded in accordance with the American Recovery and Reinvestment Act of 2009. THIS NOTICE IS TO PROVIDE FOR INFORMATION PURPOSES ONLY. THIS OPPORTUNITY IS AVAILABLE ONLY TO THE CONTRACTOR THAT WAS AWARDED THE NIH ELECTRICAL VAULT UPGRADE UNDER CONTRACT NUMBER HHSN292200900002I The seed task is to design and construct a secondary substation at Building 52, National Institutes of Health (NIH), Bethesda Maryland Campus, in accordance with NIH Design Policy and Guidelines, Standards, National Electrical Code, Life Safety Code, and all applicable codes. The Secondary Substation shall be spot network type with three transformers, spot network processors, main switchgears, feeder breakers in the switchgear, tie breaker. The main tie circuit breakers and busing shall be 400 A for pot network configuration. The spot network configuration shall be sized to allow one network transformer to be removed from service, with the remaining spot network transformers capable of carrying the entire load indefinitely without transformer fan-forced cooling, plus an additional 25% spare capacity designated for future modifications to the electrical power distribution system. Each secondary spot network shall include a 3-position primary 15 kV switch, network transformer, a secondary network protector and no-load break isolation switch. Project specifications shall require the manufacturer of the spot network substation shall furnish and coordinate all major components of the substations, including: incoming primary equipment section; network transformers; low-voltage network protector; no-load break isolation switch; control devices; protective relays; metering components; and a single warranty covering all substation assemblies, transformers, and components. The spot network substation shall be designed, assembled, tested, and installed in accordance with the latest applicable standards of NEMA, IEEE, and ANSI applicable to network transformers and network protectors. The network protector shall be a maximum-rated device, by an NIH approved manufacturer and compatible with NIH systems. The network protector shall be a fully interlocked, dead- front, draw-out design with externally mounted fuses for easy removal of the unit from enclosure for maintenance and inspection by operating hand-cranked levering system. Relay and control panels shall be mounted on draw-out control module below network protector element. Protectors shall comply with the IEEE C57.12.44 standard. The network protector shall have a mechanism controlled by a toggle-cam device that shall not allow closure of the contacts until the springs contain sufficient energy to close and latch the contacts onto available fault current. Each network protector shall have a disconnect switch mounted on top of or on the opposite wall from the network protector. The disconnect is a maintenance isolation switch for working on the network protector. Disconnecting links are not permitted for safety reasons. An intelligent electronic device (IED) shall be the three-phase type with relay functions to provide selective closing and tripping of auxiliary contacts mounted on the relay and interfaced with the protector circuitry. The relay close contact shall close if the ensuing positive sequence power shall be into the network. The relay trip contact shall close when there exists a net three-phase reverse power flow through the network protector. The trip contact shall also close upon flow of reverse magnetizing current of its associated transformer. The relay shall be enclosed in a NEMA Type 6 chemically treated, waterproof drawn brass shell, and any wiring to the relay (including communication cable) shall not compromise the rating. The relay shall offer three on-board input ports that are used for external sensors when combined with the communication package; offer internal air temperature with the communication package; utilize the capability of choosing from the traditional straight-line master close curve and the modified circular closed curve; and utilize insensitive phase rotation. The microprocessor relay shall operate under the sequence-base algorithm, which provides a flat, unchanging trip response. The relay shall operate in a temperature range of -20OC to +110OC with exertions to +125OC; and shall have the capability to communicate information to a data concentrator over a shielded twisted pair communications cable. Primary Switch: The 15 kV primary switch is a three-position, no-load break switch. The three positions are OPEN, CLOSED, and GROUND. The closed position is the center position. The switch is key interlocked, with the transformer tap changer mechanism, such that it shall be in the ground position before the transformer taps can be changed. Network Transformer: Transformers shall have temperature gauges with re-settable maximum pointers, sampling valves, high-pressure release valves, and a key-interlocked tap changer. The transformers shall be filled with an NIH approved less flammable natural ester liquid. The tap changer shall have five settings, two above and two below the 100% rating. Each tap shall represent 2.5% of nominal voltage. Transformer windings shall be copper and full kVa rated. Network Protector: The network protector shall contain time delays and other controls to prevent “pumping,” defined as the cyclical opening and closing of the network protector. Spot networks shall include a remote terminal unit (RTU), a multiplexing device sending monitoring and control signals from the respective building to the campus-wide Supervisory Control and Data Acquisition (SCADA) system. The RTU shall be located in either the transformer vault or the secondary switchgear room and shall require a 120 V circuit. The output control voltage is 48 V DC. The network protectors shall have auxiliary relays with 48 V DC coils for shunt tripping by the RTU. The RTU shall include monitoring the following devices/functions: • Pressure and temperature of liquid-cooled network transformers. • Status of network protectors. Status of all secondary main and tie circuit breakers. • Status of any battery bank systems in substations. The RTU shall include controlling the following devices: • Tripping of network protectors. • Opening and closing of secondary main and tie breakers. The RTU shall include analog inputs to measure all secondary switchgear metering. The RTU is provided with a number of analog and digital sensing points, as well as a number of relays for the control functions, and the number of points shall be augmented in the future as additional points are needed or defined. Each network protector shall have a communicating discrete network IED with terminals located outside the gear. Secondary Switchgear: Secondary low-voltage switchgear shall be the freestanding, ANSI metal enclosed draw-out type. The switchgear shall have a main circuit breaker on the secondary of each unit substation transformer. Circuit breakers shall be electrically operated air power circuit breakers or vacuum circuit breakers. Spare cubicles with circuit breakers shall be provided with a minimum of one cubicle per frame size utilized in the switchgear lineup. All spaces shall be fully bused based on frame sizes which shall be indicated on design drawings, including draw-out assemblies, bused connections, and hardware. All bus stubs shall have insulated covers. Molded case circuit breakers shall not be permitted in switchgear construction. All cubicles shall be complete with bus work, rails, wiring, equipment shorting blocks and circuit breakers. All buses shall be copper with plating per manufacturer. The switchgear shall be positioned to allow for the addition of a minimum of one vertical section to the switchgear, provided that switchgear capacity is not exceeded. If transient voltage surge suppression (TVSS) is required on switchgear, it shall be modular type and provided in the switchgear. The electrical arrangement of the switchgear is shown in single-line form in Figure B.5.b. Each main circuit breaker shall serve a section of the main bus. The sections shall be connected by tie breakers of the same ratings as the mains. The main and tie breakers are normally closed and electrically operated. The normally closed breakers form a spot network. The tie breakers shall sectionalize the main bus should a fault occur, minimizing the outage to one section of bus. The breakers shall be electrically operated to allow remote operation by the campus SCADA system. Switchgear main and tie breakers shall have discrete contacts for open close status wired to terminal strips for convenient access for SCADA connection. Switchgear shall have all potential transformer (PT) and current transformer (CT) connections wired out to shorting blocks. Switchgear IED’s shall be equipped and wired to test switches which shall allow ease of troubleshooting and repair/replacement of IED’s when necessary. For a spot network system, a unique dual ground bus arrangement is required for proper selective ground fault operation and isolation of a fault. Where ground fault protection is required on main circuit breakers, it shall also be provided on feeder circuit breakers to provide selective tripping of the breaker closest to the fault. Circuit breaker selection shall accommodate the inherently high available short-circuit interrupting current in a spot network system arrangement. All feeder draw-out switchgear circuit breakers shall be electronically operated. The control power for low-voltage circuit breakers shall be 120V AC. Over-current devices shall have short-time, long-time, ground fault, and instantaneous trip settings. Each incoming line shall be provided with over voltage and under voltage, and phase sequence protection. The switchgear shall be provided with a digital power meter measuring total power output of the switchgear. Digital readout metering shall be provided on the load side of each main circuit breaker with required metering: • Volts (phase-to-phase and phase-to-neutral). • Frequency. • Ampere demand (per phase and average three-phase). • Kilowatt hours (resettable). • Kilowatt demand (three-phase). • kVa demand (three-phase). • Harmonic load content (percent total harmonic distortion (THD)). • Power factor. The switchgear shall include the provision of a control power transformer associated with each switchgear section and the necessary switching logic so that there shall be 120 V relay and control power if any one of the three network transformers is energized. Each feeder breaker shall have self-contained local digital metering with remote reporting capability. In addition to the required SCADA metering, monitoring, and control system, the following values shall be metered: • Volts (phase-to-phase and phase-to-neutral). • Amperes. • Kilowatt hours (with reset). • Kilowatt demand. • Kilowatt peak demand. Each switchgear lineup shall have a hoist provided for lifting the circuit breakers from their withdrawn position and lowering them to a dolly or to the floor. A rail assembly shall be provided along the top of the switchgear with a hoist mechanism that can roll from end to end. Switchgears shall be located in dedicated electrical rooms. Piping, ducts, or equipment not serving the electrical equipment shall not be permitted to be installed in or traverse dedicated electrical rooms. Electrical strip heaters shall be installed in switchgear to prevent internal condensation. Project specifications shall require that specialized tools necessary for installation, maintenance, calibration, or testing of electrical equipment are supplied with the associated equipment and turned over to the government at the end of the construction project. Examples of specialized tools include a special screwdriver for vandal-proof lighting fixtures or the very complex test and calibration equipment needed to maintain solid-state circuit breakers. Non-compliance shall be cause for non-acceptance of the equipment.