* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download SECTION 16204
Survey
Document related concepts
History of electric power transmission wikipedia , lookup
Electrification wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Current source wikipedia , lookup
Power engineering wikipedia , lookup
Stray voltage wikipedia , lookup
Electrical substation wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Three-phase electric power wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Voltage optimisation wikipedia , lookup
Alternating current wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Mains electricity wikipedia , lookup
Opto-isolator wikipedia , lookup
Crossbar switch wikipedia , lookup
Transcript
SECTION 16204 AUTOMATIC TRANSFER & BYPASS-ISOLATION SWITCHES 204.01 GENERAL A. Manufacturer Acceptable manufacturers shall be ASCO 7000 Series, Zenith, or Onan. B. Material The materials and equipment used in the construction of the transfer switch covered by this specification shall be new, of the highest quality, and of the type recognized by the industry for use in this type of equipment. C. Rating 1. The ATS/BPS shall be rated to close on and withstand the available RMS symmetrical short circuit current at the ATS/BPS terminals with the type of overcurrent protection as indicated below Switch Rating (A) 600 - 800 1600- 4000 D. 2. The switch shall be 480 volt, three (3) pole solid neutral switches. 3. The switch shall be listed under Underwriter’s UL-1008 requirements and be labeled in accordance with that standard's 1-1/2 and 3 cycle, long time ratings. Description 1. 16204-rev0 Fault Current Rating (RMS Sym. kA) 65 100 The transfer switch shall be electrically operated & mechanically HELD. The Automatic transfer and bypass-isolation switch (ATS/BPS) shall consist of an inherently double-throw power transfer switch mechanism and a microprocessor controller to provide automatic operation. Electrical operation shall be accomplished by a momentarily energized single solenoid operating mechanism which receives power from the source to which the load is being transferred. The transfer switch shall be capable of transferring successfully, in either direction, with 70% of rated voltage applied to the switch terminals. 16204 - 1 December 2004 150 - 400 SECTION 16204 AUTOMATIC TRANSFER & BYPASS-ISOLATION SWITCHES 2. The normal and emergency contacts shall be positively interlocked mechanically and electrically to prevent simultaneous closing. Main contacts shall be mechanically locked in position in both the Normal and Emergency positions, without the aid of permanent magnets, latching solenoids, or motor operators. Interlocked molded case circuit breakers or contactors are not acceptable. 3. The transfer switch shall be equipped with a manual operator that is designed to prevent injury to the operating personnel, if the electrical operator should suddenly become energized during manual transfer. 4. The manual operator shall be quick-make, quick break with a lockable cover. A keyed transfer switch operator disconnect switch (maintained) type shall be included. Disconnect switch shall have red indicating lamp to indicate "ATS operator disabled." 5. The transfer switch shall be equipped with a voltage selection plug making it suitable for operation on any voltage from 208 through 600Vac, by placing the voltage election plug in the proper voltage receptacle. 6. A two-way bypass-isolation switch shall provide manual bypass of the load to either source and permit isolation of the ATS from all source and load power conductors. All main contacts shall be manually driven. Separate bypass and isolation handles shall be utilized to provide clear distinction between the functions. 7. The isolation handle shall be provide three operating modes: "Closed," "Test," and "Open". When the isolation switch is in the "Test" or "Open" mode, the bypass switch shall function as a manual transfer switch. D. Auxiliary Equipment/Features The ATS/BPS control system shall contain, but not be limited to, equipment required to perform the following functions: 16204-rev0 1. Monitor each ungrounded line with a calibrated dial, adjustable voltage, solid state UNDERVOLTAGE SENSOR for sensing a decrease of voltage below a set point, or a loss of voltage on any phase of the normal power source. Voltage sensors shall be temperature compensated for 2 percent maximum deviation over the temperature range -25F (-32C) to 175F (+79C). 2. Signal the generator set to start, in the event of a power interruption. A solid state TIME DELAY START (adjustable from 16204 - 2 December 2004 SECTION 16204 AUTOMATIC TRANSFER & BYPASS-ISOLATION SWITCHES 0.5 to 10 seconds) shall delay this signal to avoid nuisance startups on momentary voltage dips or power outages. 3. Transfer the load to the generator after it reaches proper voltage and frequency. A solid state TIME DELAY TRANSFER (adjustable from 0.5 to 10 seconds) shall delay this transfer to allow the generator to stabilize. 4. Retransfer the load to the line after normal power restoration. A TIME DELAY RETRANSFER (adjustable from 0 to 30 minutes) shall delay this transfer to avoid short term, normal power restoration. 5. Provide an automatic RETRANSFER TIME DELAY BYPASS to retransfer the load from the generator set to normal source, if generator set output interrupts after normal source restores voltage. 6. Signal the turbine/engine generator to stop after load retransfer to normal source. A solid state TIME DELAY STOP (adjustable from 0.5 to 5 minutes) shall permit engine to run unloaded to cool down before shutdown. 7. Provide NORMAL-TEST SWITCH to select “Normal” automatic operation or to start and run generating set for test purposes. Works in conjunction with WITH LOAD-WITHOUT LOAD SWITCH. Provide a WITH LOAD-WITHOUT LOAD SELECTOR SWITCH to select test or exercise as follows: 8. a. “Without Load”, the generator set runs unloaded. 9. b. “With Load”, the automatic transfer switch transfers load to generator set, after time delay, the same as it would for a normal source interruption. Provide an in-phase monitor built-in total controller. The in-phase monitor (27) shall control transfer so that motor load inrush currents do not exceed normal starting currents, and shall not require exterior controller power sources. 10. Provide a keyed three position switch to simulate normal source failure (test) and bypass time delay on retransfer to normal. 11. The controller shall provide an internal engine exerciser. The engine exerciser shall allow the user to program up to seven different exercises routines. At the end of the specified duration the switch shall transfer the load back to the specified cool down period. A 10-year life battery that supplies power to the real time clock in the event of a power loss will maintain all time and date information. 16204-rev0 16204 - 3 December 2004 SECTION 16204 AUTOMATIC TRANSFER & BYPASS-ISOLATION SWITCHES F. 204.02 Enclosure a. The ATS/BPS shall be furnished in a NEMA Type 1 enclosure unless otherwise noted. b. Transfer switch shall be rated for continuous duty, when installed in a nonventilated enclosure constructed in accordance with Underwriters Laboratories, Inc. Standard UL-508. QUALITY ASSURANCE AND APPROVAL A. Factory Testing 1. The manufacturer of the automatic transfer and bypass-isolation switches shall verify, as a condition for approval, that his switches are listed by Underwriters Laboratories, Inc., Standard UL-1008. 2. The manufacturer shall include post endurance temperature rise tests to verify the ability of the transfer switch to carry full-rated current after completing the overload and endurance tests, when conducting temperature rise tests for Paragraph 17 UL-1008. The ATS/BPS must have 3-cycle short circuit withstand capability in addition to the above, and in excess of the UL-1008 minimum requirement. 3. The manufacturer must produce certified test reports from an independent testing laboratory to establish conformance with the above, and to verify that identical samples have been subjected to three (3) phase short circuit currents at 480V AC, for a minimum of three (3) cycles duration, without contact damage or contact welding and without the use of current limiting fuse protection. Oscillograph traces are to be supplied to verify that the test parameters have been met. 4. Assemble all test data in booklets for submittal. Jobsite Testing The ATS/BPS shall be tested at the Jobsite under the supervision of a representative of the manufacturer, upon completion of the installation. Testing shall include checking of all automatic controls for proper functioning, and a load test. Operating personnel will be instructed in the proper operation and maintenance of the unit. ***END OF SECTION 16204*** 16204-rev0 16204 - 4 December 2004