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Medium Voltage Power Factor Correction Equipment Specifications Metal-Enclosed and Pad-Mounted Type Part 1 - General Scope and Product Description 1.0 This specification contains the minimum design and manufacture requirements, standards, general equipment type, warranty and installation for power factor correction equipment. Equipment shall be intended for the improvement of power factor, for medium voltage (2.4-34.5kv), AC electrical power distribution systems. 1.1 Exception to any part of this specification shall be indicated by reference to each item number, when providing a project bid. 1.2 Manufacturer of power factor correction equipment shall have been engaged in the application, design and production of such equipment for a minimum of twenty years. Manufacturer specified shall be ISO 9001 certified. The finished product shall be engineered, assembled, tested, and shipped by manufacturer. Equipment provided in any other manner is not acceptable. 1.3 Power factor correction equipment shall be suitable, in general, for three phase, 3wire, three phase 4-wire, grounded wye, ungrounded wye, or delta wire systems at 60 Hz. Equipment is designed for reliable, continuous operation in ambient temperatures of –5 C to + 40 C, up to 3300 feet (1000 meters) above sea level, with relative humidity of 70% at 20 C or higher, when controlled by thermostats, conditioned air, heaters and/or fans, as required. 1.4 A power system analysis may be required to determine the harmonic content and requirement for filters, as part of the power factor correction equipment. It will be the 1|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 responsibility of the owner, consultant, contractor or power quality service company to provide the manufacturer, at the time of request for quote, such data. 1.5 In general, the capacitor bank shall consist of an incoming section and a capactior section(s) to meet the desired application ratings shown below: Nominal System Voltage (Kv): _______________ Maximum System Voltage (Kv): _______________ System BIL (Kv: _______________ Three Phase Short Circuit Rating at Capacitor: ______________ Capacitor Bank (RMS Symmetrical Amps): _______________ Line-Ground Short Circuit Rating at Capacitor: ______________ Wire/Grounding Configuration:______________ Bank (RMS Symmetrical Amps): _______________ Total kvar:________________ Number of Steps:_____________ Rated Power (step size):___________ Capacitor Bank or Detuned Filter or Tuned Filter Type: ______________ Enclosure Type (NEMA 1, NEMA 12, NEMA 3R, other): ______________ Part 2 - Standards and References 2.0 American National Standards Institute (ANSI) 2.1 Institute of Electrical and Electronic Engineers (IEEE) 2.2 National Electrical Manufacturers Association (NEMA) 2.3 Underwriters Laboratories, Inc. (UL) 2|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 2.4 National Electrical Code (NEC) 2.5 Canadian Standards Association (CSA) 2.6 International Electrotechnical Commission (IEC) Part 3 – Enclosure Construction 3.0 The capacitor assembly shall consist of a single compartmentalized enclosure with a NEMA rated construction that will house all components, including capacitors, fuses, switches and other associated controls and components. The assembly shall provide personnel access from the front of the enclosure and rear of the enclosure, where applicable. Electrical connections shall be bottom entry. 3.1 Enclosure fabrication and construction will utilize galvanized 12 and 14-gauge, cold rolled sheet steel (stainless steel or aluminum optional). All seams shall be welded and ground smooth for proper appearance. The roof shall allow for water shed (outdoor equipment) and allow for optional roof bushings for top entry connections. C4 structural steel channel base for entire assembly and steel lifting plates shall be integral in the construction. Paint color to be ANSI 61 gray standard, other colors optional. Enclosures shall provide an aesthetic appearance with long lasting corrosion and weather resistant powder paint finish. Ventilation louvers shall be located on the front of the enclosure and shall be backed with stainless steel mesh for outdoor enclosures. Overall design of the enclosure shall be tamper resistant. Lifting lugs shall be included to facilitate handling and installation. 3.2 Doors shall provide adequate entry access to the equipment and include door stops; doors to be removable. Stainless steel hinges and hinge pins, and 3-point latching handles shall be provided, with pad-lockable handles. 3.3 Key interlocks shall be incorporated as part of a personnel safety system and to prevent unauthorized entry into the capacitor bank. The keyed interlock system shall allow all doors to be opened at one time. The interlock scheme shall include the upstream protective device (where applicable) and all doors for entry into disconnect switch/circuit breaker, ground switch, capacitors (where applicable). 3.4 Where applicable, environmental controls including thermostatically controlled strip heaters shall be supplied in all non-ventilated compartments. A thermostatically controlled fan(s) shall be provided as part of the capactior bank. 3.5 Capacitor banks shall be neatly constructed and finished, meeting all Arteche PQ quality and production control standards. 3|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 Part 4 – Capacitors 4.0 The capacitor bank shall be equipped with all-film, low loss, single phase capacitors with one or two bushings, or three-phase capacitors utilizing three bushings. The power capacitors shall consist of welded stainless steel construction with non-PCB dielectric fluid. The capacitors shall be designed, manufactured, and tested to meet and/or exceed all applicable NEMA and ANSI/IEEE standards. Each capacitor shall contain an internal discharge resistor to reduce the stored voltage to 50 volts or less within 5 minutes from disconnection. 4.1 The capacitors shall be located in a separate compartment from the main incoming disconnect switch/ fuse or circuit breaker. 4.2 Individual capacitors shall be mounted either horizontally or vertically. capacitors shall be removable from the front of the enclosure. The Part 5 - Capacitor Protection, Fusing 5.0 Each capacitor shall be protected by a non-expulsion current limiting fuse that is equipped with a blown fuse indicator and can be visible and accessible from the front of the enclosure. The individual capacitor fuses shall be firmly mounted either directly to the top of the capacitor bushings or main bus. Part 6 - Disconnect Switch 6.0 The capacitor bank shall be supplied with a three-pole, load break disconnect switch and offer a visible disconnect means of the capacitor bank. The switch shall be rated at 135% of the banks nominal current rating and shall have a 40kA RMS momentary asymmetrical rating. The switch shall be interlocked with the vacuum switches for prevention of being in the open position, when the capacitor stages are energized. 6.1 The disconnect switch shall be located in a separate compartment that is isolated from the capacitor compartment and the low voltage control compartment. 6.2 The bank shall be equipped with (optional) main incoming current limiting fuses. Fuses shall be current limiting, non-expulsion type and provide short circuit protection for an individual step or for the complete capacitor bank. The fuses shall be located on the load side of the main disconnect switch. They shall be accessible only when the bank is de-energized by the disconnect switch. 4|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 6.3 The capacitor bank shall be equipped with incoming line lugs only, where a disconnect switch is not provided. The capactior bank shall be equipped with a vacuum circuit breaker, capable to interrupt capacitive current, where required. Part 7 - Ground Switch 7.0 An externally operated ground switch, or combination disconnect and ground switch arrangement shall be provided to ground the load-side terminals of the disconnect switch. The ground switch shall be pad-lockable in either the open or closed position and utilize key interlocking, to ensure proper sequence of operation. The ground switch shall be used as a convenient means to ensure that all stored energy has been discharged from the capacitors and o provide for maximum safety. Part 8 - Surge Arresters 8.0 The capacitor bank shall be equipped with heavy duty Distribution Class surge/lightning arresters with applicable ratings. Arrestor shall be MOV type with silicone-polymer housing. Part 9 - Vacuum Switches 9.0 The capacitor bank switching steps shall be controlled by either single phase electric motor or solenoid operated vacuum switches or three phase vacuum switches. Switches shall have capacitor duty rating and provide the appropriate continuous current and BIL ratings. The control system shall prevent the vacuum switches from operating more than once in a pre-set time period. Vacuum switches shall be interlocked with the capacitor bank disconnect switch and ground switch components. Vacuum switches shall have easy access for inspection or removal. Part 10 - Inrush Reactors 10.0 Capacitor bank steps shall be equipped with individual air-core reactors, to limit the high frequency inrush current, from capactior step (back-to-back) switching. Reactors shall be designed to properly coordinate with the values of fuse ratings (I2T) and the vacuum contactors (kA x kH). The inrush reactors shall be rated for at least 135% of the switched step current. 5|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 Part 11 - Harmonic Filters 11.0 Iron-core reactors shall be provided for tuning or de-tuning purposes where applicable. Manufacturer requires specific application information, collected data and analysis to determine ratings of filtering. Part 12 – Bus System 12.0 The capacitor bank shall have a continuous horizontal main bus utilizing full rated electrical grade copper. Bus shall feed the individual capacitor steps. A 1/4" x 2" ground bus that spans the full width of the enclosure shall be provided. Stainless steel bolts and washers shall be utilized and all bus supports, either epoxy resin or porcelain type, shall withstand associated stress from short-circuit currents. Bus bar shall be uninsulated, tin plated type and allow for the future expansion of the capacitor bank. All conductor bus and will be capable of conduct at least 1.35 times Part 13 - Controls 13.0 The capacitor bank shall utilize a power factor controller to automatically switch the capacitor steps to regulate the target power factor to a preset value. Controller shall be programmable and be door mounted, or housed in own enclosure integral to the capacitor bank, where applicable. 13.1 All low voltage control, where applicable, shall be isolated from the high voltage compartments. All controls shall be accessible while the bank is energized. The control compartment shall be equipped with a swing out panel to allow access to panel mounted controls, where applicable. 13.2 The microprocessor based device shall manage, measure, and display, at a minimum: - under- and overvoltage - harmonics - defective steps - maintenance (loss of power and amount of operations) - temperature measuring with fan control and switching off steps 6|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 - digital input - number of steps in use - adjustable time settings of steps - voltage (phase/phase and phase/neutral) - current - frequency - active power - reactive power - apparent power - THD voltage - THD current - harmonics for voltage (order 2nd – 31st) - harmonics for current (order 2nd – 31st) - counter active work import / export - counter reactive work inductive / capacitive - missing reactive power for target-cosphi - temperature, measuring the temperature in the enclosure by use of sensor - Controller shall be door mounted with a back-lighted, graphical LCD display and function keypad - Modbus 485 RTU option - SCADA management option 13.3 Additional control and indication shall be available for blown fuse protection, overload-remove step off-line, externally mounted strobe light, or specific power factor controller device and communication, at a minimum. Any supervision functions shall 7|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 provide for reliable, safe operation of the compensation equipment and ensure a long life cycle of the components. 13.4 Current transformers (CT) are optional and shall be provided where applicable. Part 14 - Testing, Safety and Documentation 14.0 Capacitors shall be tested at point of construction. The power factor correction equipment shall be production tested for proper operation, prior to shipment. This shall include, at a minimum: wire connections, torque connections, mechanical functional operation, controller operation, visual inspection. 14.1 Nameplates, labels, and other decals, providing safety, general operation instruction and manufacturer data, shall be included with the equipment. Such markings shall be visually accessible and conveniently located both internally and externally on the equipment. 14.2 A manual for the purpose of operation, maintenance, and service instruction shall be included with the finished equipment. A general bill-of-material list, external and internal outline mechanical and electrical drawings shall be included with the equipment. Documentation shall be provided in a CAD format for approval or reference. Part 15 - Installation and Service 15.0 Installation and operation of equipment is intended for general business, commercial, industrial, government and energy service providers. 15.1 Correct installation is required for proper performance and function of the equipment. Physical inspection of equipment for damage is suggested, prior to any installation. Indoor storage shall be in a clean, dry environment. 15.2 National Electrical Code (NEC), electric utility company or service provider codes shall be adhered to during the installation. Electrical connections shall also be in compliance with required codes 15.3 Installer/Contractor shall inspect and verify proper alignment, anchorage, leveling and grounding, proper connections and tightness of connections, prior to any start-up procedures. 8|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011 15.4 Appropriate personnel shall start-up and operate equipment upon installation approval. 15.5 All maintenance and inspection of the power factor correction equipment shall be done with the system disconnect device in the open position. 15.6 Routine maintenance and inspections should be limited to 30 minutes (or what shall be practical), as to not disrupt utility billing practices. 15.7 An annual inspection of the capacitors, fuses, switches and reactors shall be performed. Part 16 - Equipment Warranty 16.0 The manufacturer shall provide its standard warranty for equipment of this type. The warranty shall provide for repair or replacement of the equipment, should it be found to be defective within twelve months from the date of being first energized, or eighteen months from date of shipment, or whichever occurs first. Approved Manufacturer Power factor correction equipment designer and manufacturer shall be: Arteche PQ, Inc. 16964 W. Victor Road New Berlin, WI 53151 www.artechepq.com 9|Page © Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications July 2011