Electrical Switchgear Replacement Montgomery County Community College ADDENDUM NO.1 #08-112014-SB01 November 12, 2014 The following clarifications, changes, additions or deletions for this project shall be made to the Contract Documents; all other conditions and work shall remain unchanged. The Addendum supersedes current conditions shown in the Contract Documents. Acknowledge the receipt of this Addendum by inserting the number and date in your bid. This Addendum forms a part of the Contract Documents and modifies the documents as follows: 1. Is there a spec for the new fence being provided or is the Electrical Contractor to match the existing? Match existing. 2. Refer to Page 54: Item #13-Arc Terminator states to "See specification 26 13 00.10 Integrated Arc Extinguishing System." This item/spec section is not found in the specs. Please provide this spec section. Attached is Square D specification 26 13 00.10 for Integrated Arc Extinguishing System. Comparable systems by other approved manufacturers are acceptable. Specification Number: 26 13 00.10 Product Name: ARC EXTINGUISHING SYSTEM FOR MCLD SWITCHGEAR SECTION 26 13 00.10 Integrated Arc Extinguishing System Medium Voltage Metal-clad Switchgear PART 1 GENERAL 1.01 SECTION INCLUDES A. This section describes the materials and installation requirements for integrated arc extinguishing system in metal-clad switchgear. 1.02 REFERENCES A. UL 508 Industrial Control Equipment, Sixteenth Edition, February 1993, and any identified subsidiary standards. B. CSA-C22.2, No. 14-M91 Industrial Control Equipment, September 1991 C. IEC1000-4 Electromagnetic Compatibility for Industrial-Process Measurement and Control Equipment, Sections 2, 3, 4, and 5, Level 4. D. C37.90-89 IEEE Standard for Relays and Relay Systems Associated with Electrical Power Apparatus. E. C37.90.1-89 IEEE Standard Surge Withstand Capability (SWC) Tests for Protective Relays and Relay Systems. F. C37.90.2-95 IEEE Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers.
G. IEC68.2 Basic Environmental Testing Procedures, Sections 6, 27, 29, and 31. 1.03 SUBMITTALS A. The power equipment shop drawings shall clearly identify the system components, internal connections, and all contractor connections. B. Product Data: Provide catalog sheets and technical data sheets to indicate physical data and electrical performance, electrical characteristics, and connection requirements. 1.04 RELATED SECTIONS A. Section 16340-1.1 Metal-clad Circuit Breaker Switchgear. PART 2 PRODUCT 2.01 ARC EXTINGUISHING SYSTEM - GENERAL A. Provide integral arc extinguishing system within the metal-clad switchgear. The system shall respond to an internal arcing fault condition within the switchgear by actively controlling and directing the flow of current to extinguish the open burning arc. B. Extinguishing of the open arc fault condition shall be achieved by creating a low impedance conducting path for the fault current in parallel with the arc via a high speed closing switch. C. Sensing of the open arc fault condition within the switchgear shall be achieved by monitoring both current and optical sensors installed within the switchgear lineup. In order to prevent nuisance operations, the system shall incorporate a logical 'AND' function that requires both optical sensing of an open arc condition and the sensing of a discontinuity in the current waveform prior to activation of the high speed switch. D. The control unit for the system shall include a self-test module that continuously monitors the system and energizes an alarm relay in the event that a system component is not functioning properly. E. The system shall limit the duration of an arcing fault condition and associated pressure buildup within the switchgear by sensing the arc and closing the switch in less than 4 milliseconds.
2.02 ARC EXTINGUISHING SYSTEM - RATINGS A. The Arc Extinguishing System shall have the following ratings: Table 1: Arc Extinguishing System Ratings and Specifications Type Rating Currents Nominal Fault 25, 36 and 40 ka rms symmetrical Currents (I) Continuous Current Not Applicable Rating Making Current 2.6 x I ka peak Short Time Current 48 ka for 1 second Interrupting Current Not Applicable Voltages Maximum Operating 15 kv rms. Voltage 60 Hz. One minute 36 kv rms. withstand BIL 95 kv Mechanical Contact closing time 3.5 ms max Arcing fault detection time 0.5 ms Total operating time 4.0 ms Mechanism Reset Manual Only Closing Mechanism Spring operated with electrodynamic assist Mechanical operating life 100 operations Environmental Normal operating -30 C to + 40 C ambient temperature Humidity up to 95% RH Fault Detection Instantaneous analog detection from CT on main bus entrance Arc Detection Optical detectors installed on each individual compartment Closing Signal Provided by the output of AND gate for simultaneous fault current and optical signals Initial Power Up Time Max 1 Minute Power Supply Requirements 120 or 240 VAC or 48 to 250 VDC Auxiliary Contacts 2 a and 2 b type contacts (Form C) 2.03 ARC EXTINGUISHING SYSTEM - SWITCHGEAR REQUIREMENTS A. The high-speed switch and controller shall require the same physical mounting space as a metal-clad circuit breaker. It shall be possible to provide the high-speed switch and controller in the same vertical section with a feeder circuit breaker. B. The high-speed switch and controller cubicle shall be designed as an integral part of the structure and shall include fixed primary contacts located within insulating bushings. Designs that require cable connection of the high-speed switch to the main bus are not acceptable for new applications. C. One high-speed switch and controller shall be provided for each group of up to 10 vertical sections for each main bus segment in the switchgear lineup. D. An optical sensor shall be located in each isolated compartment of the switchgear lineup. E. Each vertical section of the switchgear lineup shall include a junction box in the low voltage compartment with operation indicators for each optical sensor in the section. The operation indicators shall indicate which specific sensor /compartment within the vertical section detected an arc. In addition a single operation indicator shall be mounted on the exterior of each vertical section to provide an indication of which section of the switchgear lineup the arc was detected without opening any compartment doors or removing panels. F. The arc extinguishing system shall be installed and completely wired at the factory.
2.03 MANUFACTURERS A. Approved Vendors: Square D Company Arc Terminator System. END OF SECTION 3. Refer to dwg E-2: Note #15 states "to see specification 16610 for requirements.. " These specs are not separated by spec sections. Please clarify. Attached is specification section 16610. See paragraph D.3. MCCC Breaker Replacement October 9, 2014 NEF No.: 5528 SECTION 16610 ELECTRICAL MEDIUM VOLTAGE METALCLAD SWITCHGEAR 1.1 GENERAL A. All applicable requirements of SECTION 16000 ELECTRICAL GENERAL shall apply to this entire section and shall have the same force and effect as fully included herein. B. Equipment supplied for the switchgear, such as transformers, receptacles, panelboards, etc., shall meet the requirements of SECTION 16100 ELECTRICAL INTERIOR ELECTRICAL WORK. C. Provide complete and wholly operating medium voltage 15KV freestanding metal-clad switchgear with fused disconnect switches and vacuum circuit breakers, PECO metering enclosures and fuses. D. Provide manufacturer's technical service as required for job site consultations on the installations of the equipment, testing and placing the equipment in satisfactory operation including final inspections and for engineering consultations for determining fuse sizes and relay settings. E. Provide written letter stating that the switchgear is ready to be energized. F. Applicable Drawings: The drawing shall be used to supplement these specifications but is furnished for information only. Installation shall be based on approved shop drawings. Drawing No. Title E-1 Single Line Diagram G. Delivery, Storage and Handling 1. Accept equipment on site and inspect for shipping damage. 2. Protect equipment from weather and moisture by covering with heavy plastic or canvas and by maintaining heat within enclosure in accordance with manufacturer's instructions. H. Extra Materials/Accessories 1. Submit one racking handle(s) with equipment. Charging handle to be furnished on each breaker mechanism. 2. Provide one sets of spare control fuses for each set installed. 3. For all switchgear with circuit breakers in upper compartments, provide one circuit breaker lifting device - portable, floor-supported with a roller base. I. Submittals 1. Shop Drawing Submittals - Vendor shall submit three (3) sets of shop drawings to Owner within two (2) weeks of receipt of purchase order. Fabrication to be completed within ten (10) weeks of receipt of Owner approved shop drawings. Vendor shall contact Owner upon receipt of Owner approved drawings. Deliver within one (1) week of fabrication completion. Provide Owner with two (2) weeks minimum notice of delivery date.
2. Operating and Maintenance Manuals Vendor shall supply three (3) complete sets of operating and maintenance manuals inclusive of fabrication drawings, complete parts and material listing, recommended spare parts listing and recommended service and service interval listing. 1.2 PRODUCTS A. The metalclad switchgear shall be manufactured by Eaton Corporation, General Electric, Siemens, Square D or an approved equal.
B. The metal-clad switchgear shall consist of an outdoor common aisle double row] enclosure containing circuit breakers and the necessary accessory components all factory assembled (except for necessary shipping splits) and operationally checked. The assembly shall be a self-supporting and floor mounted on a level concrete pad. The integrated switchgear assembly shall withstand the effects of closing, carrying and interrupting currents up to the assigned maximum short circuit rating. 1. System Voltage: 13.2KV nominal, three-phase solidly grounded 60 Hz. 2. Maximum Design Voltage:15.0KV. 3. Impulse Withstand (Basic Impulse Level): 95KV. 4. Power Frequency Withstand: 36KV, 1 minute test. 5. Main Bus Ampacity: 1200 amps, continuous. 6. Momentary Current Ratings: Equal to the circuit breaker close and latch rating. C. Components 1. Stationary Structure a. The switchgear shall consist of 10 sections including 3 breaker compartments, 2 PECO metering compartments and 5 auxiliary compartments assembled to form a rigid self-supporting completely enclosed structure providing steel barriers between sections. b. The sections are divided by metal barriers into the following separate compartments: 1) Circuit breaker, instrument, main bus, auxiliary device and cable. Each feeder section may have up to two circuit breaker compartments. c. Provide one set of MOV lighting arresters for each main breaker. d. A strip heater with ambient thermostat shall be provided in all compartments and wired to the control power panelboard. 2. Fused Switches a. The fused switches shall consist of deadfront, completely metal enclosed outdoor freestanding structures containing interrupter switches and fuses of the number, rating, and type noted on the drawings or specified herein. b. The load interrupter switches shall be quick make, quick-break three pole, gang operated, with stored energy operation. Each switch shall have the following minimum ratings: System Voltage 13.2 KV three phase, three wire Maximum Design Voltage 15.0 KV Basic Impulse Level 95 KV Amperes Continuous 600 Amperes Amperes Interrupting 25 K Amperes Sym. Momentary (Switch Closed, 10 cycle) 61 K Amps. Asym. Fault Close 40 K Amps. Asym c. A manual over toggle type mechanism shall be supplied which utilized a heavy duty coil spring to provide opening and closing action of the switch. The speed of opening and closing the switch shall be independent of the operator, and it shall be impossible to tease the switch into any intermediate position.
d. The interrupter switch shall have separate main and make/break contacts to provide maximum endurance for fault close and load interrupting duty. The switch assembly shall have insulating barriers between phases and between outer phases and the enclosure. e. The switch assembly shall be integrally designed and produced by the manufacturer of the interrupter switches, fuses and enclosures to assure a completely coordinated design and establish one source of responsibility for the equipment's performance. f. The switchgear shall be rated for outdoor weatherproof use. A strip heater with ambient thermostat shall be provided and wired to the control power panelboard for each switch. g. Dual lugs shall be provided for loop connection of the feeder circuit for the Chiller Plant Switch and the switch shall have provision for a key interlock which interfaces with an existing key lock such that the switch cannot be closed unless the Chiller Plant circuit breaker is open. h. All bus shall be insulated silver plated copper and be mounted on NEMA rated glass polyester insulators. All bussing shall be braced for the maximum available fault current. Bus shall have provisions for future extension. i. Provide a 500W, 240 volt, single phase strip heater with thermostat in each fused switch section. Wire all heaters to the control power panelboard in the switchgear section. 3. Circuit Breaker Compartment a. Each circuit breaker compartment shall be designed to house a horizontal drawout metal-clad vacuum circuit breaker. The stationary primary disconnecting contacts are to be silver-plated copper and mounted within glass polyester support bushings. The movable contacts and springs shall be mounted on the circuit breaker element for ease of inspection/maintenance. b. Entrance to the stationary primary disconnecting contacts shall be automatically covered by metal shutters when the circuit breaker is withdrawn from the connected position to the test or disconnected position or removed from the circuit breaker compartment. Extend a ground bus into the circuit breaker compartment to automatically ground the breaker frame with high-current spring type grounding contacts located on the breaker chassis when in the test and connected positions. Guide rails for positioning the circuit breaker and all other necessary hardware are to be an integral part of the circuit breaker compartment. Blocking devices shall interlock breaker frame sizes to prevent installation of a lower ampere rating or interrupting capacity element into a compartment designed for one of a higher rating. It shall be possible with indoor or outdoor walk-in switchgear to install a circuit breaker into a bottom compartment without use of a transport truck or lift device. 4. Cable Compartment/Ground Bus a. Clamp type cable lugs shall be furnished as shown on plans. The ground bus shall extend through this compartment for the full length of the switchgear including the fused switches. Auxiliary bus, if needed, and load bus support NEMA Class A-20 standoff insulators shall be epoxy. 5. Main Bus Compartment a. The main bus is to be rated 1200 amps and be fully insulated for its entire length including the fused switches and transition sections with an epoxy coating by the fluidized bed process. The conductors are to be silver-plated copper and be of a bolted design. Access to this compartment is gained from the front or rear of the structure by removing a steel barrier. Provide standard provisions for future extension.
6. Doors and Panels a. Relays, meters, control switches, etc., shall be mounted on a formed front-hinged panel for each circuit breaker compartment. 7. Circuit Breakers: a. The circuit breakers shall be rated 13,200 nominal volts,15000 maximum volts, 60 Hz, with a continuous current rating of 1200 amps and a maximum symmetrical interrupting rating of 25kA/500MVA - 15 kv system. Furnish Type VR circuit breakers with one vacuum interrupter per phase. Breakers of same type and rating shall be completely interchangeable. The circuit breaker shall be operated by means of a stored energy mechanism which is normally charged by a universal motor but can also be charged by the manual handle supplied on each VR breaker for manual emergency closing or testing. The closing speed of the moving contacts is to be independent of both the control voltage and the operator. Provide a full front shield on the breaker. Secondary control circuits shall be connected automatically with a self-aligning, self-engaging plug and receptacle arrangement when the circuit breaker is racked into the connected position. Provision shall be made for secondary control plug to be manually connected in test position. A minimum of 4 auxiliary contacts (2a 2b), shall be provided for external use. Provisions shall be made for 6 additional cell-mounted auxiliary contacts for external use. The racking mechanism to move the breaker between positions shall be operable with the front door closed and position indication shall be visible with door closed. b. An interlocking system shall be provided to prevent racking a closed circuit breaker to or from any position. An additional interlock shall automatically discharge the stored-energy operating mechanism springs upon removal of the breaker out of the compartment. c. The circuit breaker control voltage shall be: 120, volts ac - provide one capacitor trip unit for each circuit breaker. 8. Instrument Transformers a. Current transformers: Each breaker compartment shall have provision for front-accessible mounting of up to four current transformers per phase (ANSI standard relay accuracy), two on bus side and two on cable side of circuit breaker. The current transformer assembly shall be insulated for the full voltage rating of the switchgear. The current transformers wiring shall be Type SIS #12 AWG. Relaying and metering accuracy shall conform to ANSI Standards. b. Voltage transformers are drawout mounted with primary current-limiting fuses and shall have ratio as indicated. The transformers shall have mechanical rating equal to the momentary rating of the circuit breakers and shall have metering accuracy per ANSI Standards. 9. Control Wiring a. The switchgear shall be wired with type SIS #14 AWG, except where larger size wire is specified. The switchgear shall be provided with terminal blocks for outgoing control connections. Wire markers shall be provided for each end of all control wires. 10. Protective Relays: a. Provide relays as indicated on drawings for each circuit breaker. b. The overcurrent relays shall have time-current coordination curves which match exactly the CO8 and CO9 relays presently used and shall be set to the same settings as the existing relays so as to have exactly the same coordination as the present system.
c. The most recent relay test reports with existing relay settings are attached at the end of this specification. 11. With each main circuit breaker, provide a PowerLogic ION7650 manufactured by Schneider Electric or equal with the following characteristics: a. Current/Voltage Inputs 1) The PMS Instrument shall have no less then 4 voltage inputs and 5 current inputs. 2) The PMS Instrument in its standard configuration shall be able to accept 600VAC without using potential transformers. 3) The PMS Instrument shall be able to withstand 1500 VAC RMS continuously. 4) The PMS Instrument shall support nominal current ratings of 1A, 2A, 5A, 10A, and/or 20A. b. PMS Instrument shall provide at minimum the following voltage & current values: 1) Voltage L L Per- Phase, L-L 3-Phase Avg, L N Per-Phase, 3-Phase Avg, Voltage % unbalanced 2) The PMS Instrument shall provide at minimum the following current values: a) Current Per-Phase, Current, Neutral (measured), Current 3-Phase Avg, Current % Unbalanced 3) The PMS Instrument shall provide at minimum the following power & energy values: Real Power (Per-Phase, 3-Phase Total) Reactive Power (Per-Phase, 3-Phase Total) Apparent Power (Per-Phase, 3-Phase Total) Power Factor True (Per-Phase, 3-Phase Total) Power Factor Displacement (Per-Phase, 3-Phase Total Accumulated Energy (Real kwh, Reactive kvarh, Apparent kvah) (Signed/Absolute) Incremental Energy (Real kwh, Reactive kvarh, Apparent kvah) (Signed/Absolute) Conditional Energy (Real kwh, Reactive kvarh, Apparent kvah) (Signed/Absolute) Reactive Energy by Quadrant 12. Provide an automatic transfer system which will open the proper main breaker and close the tie breaker on loss of voltage at either of the two sources. The system shall be approved by PECO. Each main shall have a "push-to-test" pushbutton to allow periodic testing. 13. Arc Terminator: Integrated Arc Extinguishing System up to 50 KA. The system shall respond to an internal arcing fault condition within the switchgear by actively controlling and directing the flow of current to extinguish the open burning arc. See specification 26 13 00.10 Integrated Arc Extinguishing System. 14. Control Power System a. Two control power transformers, each sized for the switchgear support loads (strip heaters, controls, lighting fixtures, receptacles, etc.) plus allowing 5KVA for other existing site loads, shall be provided and connected to the two sources with automatic transfer between the sources.
b. A control power panelboard shall be provided with circuit breakers as needed for the above support loads, plus ten 20A, 1 pole breakers for the existing Site Loads. D. Fabrication 1. Construction: Each equipment bay shall be a separately constructed cubicle assembled to form a rigid freestanding unit. Minimum sheet metal thickness shall be 11 gauge steel on all exterior surfaces. Adjacent bays shall be securely bolted together to form an integrated rigid structure. The rear covers shall be removable to assist installation and maintenance of bus and cables. Each individual unit shall be braced to prevent distortion. 2. Dimensions: Outdoor equipment dimensions will vary with enclosure style and circuit breaker selection. Maximum height shall be 115 in for walk-in style enclosure, measured to peak of the sloped roof. 3. Miscellaneous support equipment shall be provided for the walk-in enclosure as follows: a. Provide four two lamp T8 strip lighting fixtures and circuit to illuminate the aisleway with a local switch at each entrance. b. Provide three GFCI receptacles and circuit. Two shall be in weatherproof enclosures on two ends of the switchgear and one shall be in the aisleway. c. Provide two 50 watt metal halide exterior lighting fixtures and circuit with photocell control located over the switchgear doors. 4. The metal-clad switchgear shall be fully assembled, inspected and tested at the factory prior to shipment. Large line-ups shall be split to permit normal shipping and handling as well as for ease of rejoining at the job site. E. Factory Finishing 1. All steel parts, except galvanized (if used), shall be cleaned and a zinc-phosphate (outdoor equipment) or iron phosphate (indoor equipment) pre-treatment applied prior to paint application. 2. Paint color shall be ANSI-61 light grey; TGIC polyester powder, applied electrostatically through air. Following paint application, parts shall be baked to produce a hard durable finish. The average thickness of the paint film shall be 2.0 mils. Paint film shall be uniform in color and free from blisters, sags, flaking and peeling. 3. Adequacy of paint finish to inhibit the buildup of rust on ferrous metal materials shall be tested and evaluated per paragraphs 5.2.8.1-7 of ANSI C37.20.2-1987. Salt spray withstand tests in accordance with ASTM #D-1654 and #B-117 shall be performed on a periodic basis to provide conformance with the corrosion resistance standard of at least 2500 hours minimum (outdoor equipment) or 600 hours minimum (indoor equipment). 1.3 EXECUTION A. Examination 1. Visually inspect switchgear for evidence of damage and verify that surfaces are ready to receive work. 2. Visually inspect to confirm that all items and accessories are in accordance with specifications and drawings. 3. Verify field measurements are as shown on shop drawings. 4. Verify that required utilities (e.g., control voltage for heater circuits on outdoor switchgear) are available, in proper location, and ready for use.
5. Beginning of installation means installer accepts existing surface conditions. B. Installation 1. Install in accordance with manufacturer's instructions, applicable requirements of the NEC and in accordance with recognized industry practices. 2. Install cables, as provided by the switchgear manufacturer, to connect the primary surge arresters. 3. Bending of high-voltage cables should be avoided or minimized. All necessary bends should meet at least the minimum radii specified by the cable manufacturer. 4. Install PECO metering per their standards. 5. Install key interlock system between the fused switch and the existing chiller 13.2KV circuit breaker. C. Field Quality Control 1. Field inspection and testing shall be performed by a qualified Manufacturer's Representative. 2. Visually inspect for physical damage. 3. Perform start-up tests in accordance with manufacturer's instruction manual. 4. Touch-up paint all chips and scratches with manufacturer-supplied paint and leave remaining paint with owner. 5. Verify key interlock operation. 6. Perform low frequency withstand (Hi-Pot) tests according to ANSI/IEEE C37.20.2, paragraph 5.5. 7. Perform relay testing by a certified Electrical Testing Agency. 8. Coordinate inspections by PECO's Representative. END OF SECTION
THERE ARE NO FURTHER CHANGES TO THIS ADDENDUM END OF ADDENDUM NO.1