3003 W CASINO RD 2018 BLDG 40-23 Plans 2022-12-06 (2)

SUBSTATIONS 11-1 AND 11-2 SECTION 26 11 16 PROJECT#22349762 SECONDARY UNIT SUBSTATIONS BOEING - EVERETT SITE SERVICES permeability and low hysteresis and eddy current losses. Step lap miter type punching of laminations is required. Magnetic flux densities shall be well below the saturation point, such that 110% of nominal voltage at the nominal tap will result in an excitation current increase of less than 10%. E. Bracing: The entire assembly shall be adequately braced to tolerate full through fault short circuit conditions with negligible mechanical distortion when faults are terminated by upstream devices to the left of the ANSI transformer damage curve. F. Enclosure: The base of the enclosure shall be furnished with ground pads located on the primary and secondary termination ends of the transformer, to match up with grounding provisions in the low voltage switchgear. Ground pads shall be connected together via a 1-1/2 inch by 1/4 inch minimum size transformer ground bus. The core shall be insulated from the core clamping steel by Class H insulation, and shall be grounded at one point, by means of a flexible copper strap, rated to carry line to ground secondary current for a duration adequate to allow the primary circuit breaker or fuse to operate, in the event of a low voltage winding to core short circuit. G. Accessories and Features: Diagrammatic stainless steel engraved nameplate. Engravings shall be filled with black enamel. Nameplate shall indicate applicable ratings at the nominal temperature rise, and each additional rating achieved through higher temperature rises and fan cooling, temperature rise, impedance, voltages, weights, conductor material (copper), phasing layout, frequency, and allowable ambient temperature. H. Core Assembly: Isolate from the enclosure by vibration absorbing pads. I. Thermocouple and Fan Wiring: Utilize EMT or flexible metal conduit. J. No plastic wire ties shall be used inside the transformer. K. The forced air fan system shall consist of the following. 1. 120V single phase fans, suitable for the attendant environment. 2. One thermocouple embedded in each core's low voltage winding (three total). The thermocouple must be installed during manufacture, and cannot be added after coil winding, unless a permanent well is part of the winding. 3. Control Module, which shall accept all 3 thermocouple inputs, and 120V AC control power from the switchgear. Control module shall provide analog or digital display of the maximum temperature of the set of 3 thermocouples and shall allow viewing of any of the thermocouple temperatures. Control module shall automatically control fans for the 80 degree C, FA rating. Control module shall permit manual operation of fans. Control module shall provide two (2) form C contacts for high temperature alarm, two (2) form C contacts for high temperature trip, and one (1) form C contact for loss of control power. Wiring from the transformer to the low voltage switchgear shall be via EMT conduit. Local alarm for transformer temperature shall be provided in low voltage switchgear. L. Tests: 1. The transformers shall be subjected to the following tests per ANSI standards. Provide certified test reports for the Owner's Representative review prior to shipment of the transformers. a. Resistance of all windings. b. Ratio tests at all tap connections. c. Polarity and phase relation tests at the nominal tap position. d. No load loss and excitation current at rated voltage at the nominal tap position. 2611 16-9 (07/15/18)