Attachment A - Parker Substation Equipment Spec - 5-28-20.docx
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Parker Substation Equipment Specifications – 28 May 2020
Bidding Schedule item “Steel structures, welded (galvanized)” includes providing the following as shown on Drawings PAD 2618 and PAD 2619:
One (1) – Station Service Equipment Support Frame.
One (1) – Safety switch Support Frame.
Galvanized connection bolts, nuts, washers and lock nuts.
MEASUREMENT: Measurement for quantities for Bidding Schedule items “Steel structures, welded (galvanized)”, will be made on the basis of weights calculated in accordance with LRFD, “AISC Code of Standard Practice for Steel Buildings and Bridges”, except that weights for nonrectangular shapes and plates are to be based on actual detailed dimensions.
a. Steel structure weights, calculated as noted above, shall be shown on the Contractor-furnished final shop drawings and payment will be based thereon. Steel estimated weights are shown on the specifications drawings for the structures requiring approval drawings as noted in the Bidding Schedule items “Steel structures, welded (galvanized).”
Bidding Schedule item “Automatic transfer switch, 480V, 600 amps, threephase” includes providing outdoor automatic transfer switch Emerson Network Power ASCO J07ATSB30600N5XP, with accessories 44A and 135L or equal as shown on Drawing PAD 1631 in accordance with WAPA ES 2.3.6 Equipment Standards:
| DESIGNATION |
| ATS |
| Type |
| Free-standing, self-contained, metal enclosed, 3-phase, 60 Hz |
| Required Voltage Rating |
| 480 V |
| Enclosure |
| Type 4X SS Outdoor |
| Transition type |
| Contactor based |
| Source continuous current rating (amps) |
| 600 |
| Momentary current 10 cycle Asym, (kA) |
| 65 |
| Operation type |
| Open (break before make) |
| Poles |
| 4 |
| Switched neutral |
| Yes |
The automatic transfer switch shall have three-phase switching and have automatic, remote and manual operation. The source transfer shall be break before make.
Voltage and frequency on both the primary and secondary sources shall be continuously monitored with adjustable pickup and dropout settings.
Load side power monitoring shall be provided, to include voltage, current, frequency and power factor, read from an LCD screen ASCO 5210 digital power meter or equal on the ATS.
The power meter must be able to transmit voltage, frequency, current, switch position and source availability via Modbus protocol.
The power meter shall include provisions for RS485 interface capable of external Modbus RTU communication.
The transfer switch shall display source availability and switch position indicators.
Bidding Schedule item “Station service transformer” includes providing station service transformer in accordance with WAPA ES 2.1 Equipment Standard:
| DESIGNATION |
| KW1B |
| Type |
| Pad mounted, 3 phase, 60 Hz, outdoor, self-cooled, FR3* oil filled, Loop Feed, dead front |
| Voltage Rating |
| 2.4kV delta to 480/277V grounded wye |
| High-Voltage Taps (percent) |
| ±2.5, ±5.0 |
| Capacity (kVA) |
| 500 |
| Percent Impedance |
| 1.70 - 5.75 |
| Number of High-Voltage Bushing Wells |
| 6 |
| Number of Low-Voltage Bushings with NEMA Pads |
| 4 |
| High-Voltage BIL (kV) |
| 60 |
| Low-Voltage BIL (kV) |
| 30 |
| Primary side fuse |
| No |
* Envirotemp FR3 or equal.
Transformers shall be Eaton Cooper Envirotran transformer type or equal.
For the transformer supply the following accessories:
High voltage parking stands mounted adjacent to high-voltage bushing wells.
Bidding Schedule item “Safety switch” includes providing three (3) AC safety switches as shown on Drawings PAD 1631, PAD 1632, PAD 1633 and PAD 1634. Safety Switches are designated SSA, SSB and SSC. Safety Switch enclosures shall be NEMA type 4X. Safety switches shall be in accordance with WAPA ES 2.3.4.15 Equipment Standard.
Bidding Schedule item “Outdoor AC distribution panelboard” includes providing outdoor AC distribution boards DZB and DSA as shown on Drawings PAD 1631 and PAD 1634. Panelboards shall be Square D I-Line or equal and shall have three (3) flat bus bars stacked and aligned vertically with glass reinforced polyester insulators laminated between phases. The molded polyester insulators shall support and provide phase isolation to the entire length of bus.
Each distribution panelboard enclosure shall be NEMA 4X and large enough (91-inches by 42inches by 11.75-inches D) to house branch circuit breakers and condensation heater as shown on Drawings PAD 1631 and PAD 1634. The distribution boards shall be in accordance with WAPA ES 2.3.3, 2.3.4 and 2.3.11 Equipment Standards. Provide Hoffman enclosure clamp assemblies #AFC412SS or equal in lieu of the standard NEMA 4X door clamps.
Bidding Schedule item “Lighting contactor” includes providing a lighting contactor as shown on Drawing PAD 1634:
Lighting contactor shall be furnished in accordance with Drawing PAD 1634 and WAPA ES 2.3.3.4. The contactor shall be installed on support structure on the back side of panel DSA. Lighting contactor enclosure shall be 24-inches-wide by 24-inches-high and NEMA 4X. Provide Hoffman enclosure clamp assemblies #AFC412SS or equal in lieu of the standard NEMA 4X door clamps.
Bidding Schedule item “Insulated conductors” includes providing 600V insulated copper conductors and cables as shown on Drawings PAD 1631 and PAD 1634. Conductor insulation shall be in accordance with Construction standards 9 Section 9.2.3. Approximate lengths are as follows:
Single conductor, 500kcmil THWN – 2,100 FT Single conductor, 4/0 AWG THWN – 450 FT
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