PWP_Mobile_Substation_General_Specifications.pdf
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- Attached to
- Mobile Substation Project
- Solicitation number
- 2026-RFP-0415
- Issued by
- Los Angeles County, California
About this file
This document is a technical specifications file for Pasadena Water & Power's Mobile Substation Project in California. The City of Pasadena seeks proposals from qualified manufacturers to design, fabricate, and deliver two independent mobile substations mounted on highway-type semi-trailers to serve both primary distribution voltages within the city. The mobile substations will provide emergency power and support construction initiatives, with a desired in-service date of June 2029. Each mobile substation must be self-contained, dead front, and capable of being towed by PWP's existing Peterbilt tractor. The project requires two units: one for the 4kV system (9 MVA to 12.5 MVA) and one for the 17kV system (25 MVA to 30 MVA). Key specifications include trailer dimensions of 8'6" width by 13'9" height, design to withstand 100-mph wind velocities, a 30-year design life, and compatibility with PWP's existing tractor, which has a gross vehicle weight rating of 56,540 lbs. The contract includes delivery of two complete mobile substations with all components, on-site training, and a two-year delivery timeline from contract execution.
The specifications require vendors to supply protection and control systems including SEL relays, SCADA equipment, security systems with panoramic cameras and network switches, 48VDC and 120/240V AC systems, oil spill containment berms for each unit, and temporary deployment equipment including non-conductive fencing and grounding systems. All equipment must meet ANSI/IEEE, ASME, ASTM, NEMA, and NEC standards, with transformers rated at approximately 15% impedance and featuring de-energized tap changers on the primary and on-load tap changers on the secondary. The vendor is expected to function as a subject matter expert and may propose alternate equipment and configurations that improve upon the specifications. All electrical quantities, physical dimensions, weights, and other values are nominal until detailed negotiations with the successful vendor are concluded. Warranty and on-site training provisions must be included in proposals, with the successful vendor responsible for engineering, fabrication, and comprehensive documentation including trailer weights, transformer losses, noise levels, manufacturing details, and equipment specifications.
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Pasadena Water & Power
Mobile Substation General Specifications
Aug
Pasadena Water & Power - Mobile Substation Technical Specifications
Section 1 Table of Contents
Section 1 Table of Contents
Section 2 Summary Specifications
2.1. Objective
2.2. Technical Requirements
2.3. Proposal Technical Information
2.4. Sample Single Line Diagram
2.5. Sample Communications Diagram
2.6. Codes and Standards
2.7. Tractor Dimensions
Section 2 Summary Specifications
2.1. Objective
1. Procure two independent mobile substations to serve both primary distribution voltages within the City of Pasadena.
2.2. Technical Requirements
1. These specifications set forth the minimum requirements for two self-contained, dead front mobile substations, mounted on highway-type semi-trailers to be supplied to Pasadena Water and Power (PWP). This Summary Specifications document provides a high-level summary of the technical requirements and use case for the mobile substations.
2. Vendor shall engineer, fabricate and deliver the mobile substation to fulfill the intent of these technical specifications.
3. As the Subject Matter Expert on mobile substations, the Vendor may propose alternate equipment, materials, methods, configurations, protection systems, ratings, etc. that would improve on these specifications and would be more appropriate for the mobile substation application.
4. Due to the highly specialized nature of mobile substation engineering and construction, the Vendor shall be expected to educate PWP representatives about the compromises between weight, losses, capacity, arrangement, and all other parameters so that PWP representatives may select the best possible mobile substation.
5. All electrical quantities, ratings, physical dimensions, unit arrangement, weights and other values outlined in this Specification are to be considered as nominal values until detailed negotiations between the successful Vendor and PWP are concluded.
6. General Technical Requirements
6.1. The mobile substation shall not have any exposed energized equipment.
6.2. The mobile substation and all components shall be engineered to withstand the forces associated with a 100-mph wind velocity.
6.3. All equipment shall be provided per ANSI and IEEE standards.
6.4. All equipment shall be outdoor rated.
6.5. Design Life: Thirty (30) years.
7. Trailer
7.1. Shall be designed to be as compact as possible.
7.2. Dimensions: 8’6” Width, 13’9” Height.
7.3. Capable of being towed by PWP’s existing Peterbilt Tractor as per Section 2.7.
7.3.1. A jeep dolly shall be included that is compatible with both mobile substations.
7.4. Steerable rear axle with crab walk capability.
7.5. Operating High and Low voltage switchgear shall not require additional external walkways or platforms for the mobile transformer trailer.
8. In-Service Transformers: Configuration of existing transformers that the mobile substation will support.
8.1. 4kV System
8.1.1. HV winding: 34.4 kV delta/17.2 kV delta
8.1.2. LV winding: 4.36 kV wye grounded
8.1.3. The 4kV mobile will require a dual voltage primary winding
8.2. 17kV System
8.2.1. HV winding: 34.4 kV wye grounded
8.2.2. LV winding: 17.2 kV wye grounded
8.2.3. Tertiary winding: 4.16kV delta
8.2.4. Power/Autotransformer
9. Mobile Transformer, ODAF
9.1.1. 25 MVA to 30MVA for 17.2 kV LV
9.1.2. 9 MVA to 12.5MVA for 4.36 kV LV
9.2. Impedance: ~15% at rated MVA
9.3. De-Energized Tap Changer: on HV primary
9.3.1. +5/-5% regulation across 2R, N, and 2L taps
9.4. On Load Tap Changer on LV secondary
9.4.1. +10/-10% regulation across 16R, N, and 16L taps.
9.4.2. Reactor/vacuum interrupter type
9.4.3. Maintenance free dehydrating breather
9.5. Basic Impulse Level (BIL)
9.5.1. HV Winding
1. 34.4 kV: 200 kV, N 110 kV
2. 17.2kV: 150kV, N 110 kV
9.5.2. LV Winding
1. 17.2 kV: 125kV, N 125kV
2. 4.36 kV: 95 kV, N 95 kV
9.6. Dissolved Gas Analysis (DGA) -minimum 8 gas
10. High-Side Switchgear (38kV class), 40kA sym interrupting
11. Low-Side Switchgear 2,000A Main Bus
11.1. Two (2) feeder breakers
11.2. 25kV class for 17.2kV application
11.3. 5kV class for 4.36kV application
12. High-Side Cables Supports
13. Protection, Controls and Metering (Supplied by Vendor, PWP to program)
13.1. (1) SEL-487E Differential and Backup Overcurrent Relay
13.2. (1) SEL-751 Transformer Overcurrent Relay
13.3. (2) SEL-751 Feeder Overcurrent Relays
13.4. (1) SEL-2414 Transformer Monitor
13.5. (1) SEL-2240 Axion
13.6. (1) SEL-2730M Ethernet Switch
13.7. (1) SEL-2407 Satellite-Synchronized Network Clock and (1) SEL-9524 Clock Antenna
13.8. (1) Transformer OLTC Controller
13.9. Lockout Relays
14. Control and Selector Switches
14.1. Selector Switch for Relay Settings Groups
14.2. Selector Switch for LOCAL/REMOTE
14.3. Control Switch for AUTO/MANUAL
14.4. Control Switch for LOWER/RAISE
14.5. Control Switch for Circuit Breaker controls
15. Test Switches
16. 48VDC DC System with battery bank and chargers
17. 120/240V AC System
17.1. Automatic Transfer Switch for alternate auxiliary source from substation
17.2. 120/240V AC Load Center
18. Security
18.1. Axis M4348-PLVE Panoramic Cameras
18.2. Axis D8208-R Network Switch with SFP Module
18.3. Axis TQ1808-VE Security Cabinet
18.4. Security Patch Panel
19. Control Cabinet(s) and SCADA Patch Panel
20. Oil Spill Containment Berms
20.1. One system for each mobile
21. System for deployment outside of a substation, including non-conductive temporary fencing and grounding equipment
21.1. One system for each mobile
22. Warranty
23. On-Site training for each substation
24. Delivery: Two (2) years from execution of contract
2.3. Proposal Technical Information
1. The Vendor should include sufficient detail in the proposal to allow for technical evaluation of each mobile substation. The items below are for demonstration purposes and are not meant to be comprehensive.
1.1. Trailer dimensions
1.2. Trailer weights
1.2.1. Overall weight
1.2.2. Weight breakdown with sub-components (tank, core, oil, etc)
1.2.3. Kingpin weight with and without jeep dolly
1.3. Trailer elevation and layout
1.4. Transformer losses (load, no-load, and auxiliary) and loss calculation methodology.
1.5. Average noise Level.
1.6. Mobile construction details.
1.6.1. Manufacturing and Location Information
1.6.2. Transformer Information
1. Manufacturer
2. Ratings
3. Core/Winding Construction
4. Tank Construction
5. Relays/Sensors/Accessories/Bushings
6. Engineering details – short circuit forces, safety factors, etc
7. Painting
1.6.3. High Side Breaker and Equipment
1. Ratings
2. Current transformers ratings and type
3. Make/Model
1.6.4. Low Side Switchgear
1. Ratings
2. Current transformers ratings and type
3. Make/Model
1.6.5. Trailer Information such as leveling system and rear axle group steering system
1.7. Mobile equipment details for deployment outside of a substation.
1.8. Warranty information such as duration, effective start date, field repair vs factory repair, limitations, sub-contracted components, etc.
1.9. Training information such as scope, number/type of vendor personnel on-site, content, training materials provided, etc.
2.4. Sample Single Line Diagram
2.5. Sample Communications Diagram
2.6. Codes and Standards
1. Vendor’s engineering and construction of all components shall comply with the latest published standards of ANSI/IEEE, ASME, ASTM, NEMA, and NEC as listed below. Vendor shall comply with any additional standards that are not listed below as seen necessary by the vendor and common practice. PWP reserves the right to request test results reflecting compliance with such standards.
2. In the event of conflict between the codes, standards, PWP’s drawings and this Specification, Vendor shall notify PWP and secure a written clarification before proceeding with the work.
3. American National Standards Institute (ANSI) / Institute of Electrical and Electronic Engineers
(IEEE)
3.1. IEEE C2 National Electric Safety Code (NESC)
3.2. ANSI C29.1 Electric Power Insulators – Test Methods
3.3. ANSI C29.11 Composite Insulator – Test Methods
3.4. ANSI C29.17 Composite Insulators – Transmission Line Post Type
3.5. ANSI C29.18 Composite Insulators – Distribution Line Post Type
3.6. ANSI C76.1 Requirements and Test Code for Outdoor apparatus Bushings
3.7. IEEE C37 All applicable standards from IEEE C37
3.8. IEEE C57 All applicable standards from IEEE C57
3.9. IEEE C63.2 Standard for Electromagnetic Noise and Field Strength Instruments
3.10. IEEE C62.41 Recommended Practice for Surge Voltages in Low Voltage AC Power
Circuits
3.11. IEEE C68.1 Test Techniques for Dielectric Tests
3.12. IEEE 693 Recommended Practice for Seismic Design of Substations
3.13. IEEE 1268 Guide for the Safe Installation of mobile substation Equipment
3.14. IEEE 1300 Guide for Cable Connections for Gas-Insulated Substations
4. American Society of Mechanical Engineers (ASME)
4.1. ASME B18.2.1 Square and Hex Bolts and Screw Inch Series
4.2. ASME B18.2.2 Square and Hex Nuts (Inch Series)
5. American Society for Testing and Materials (ASTM)
5.1. ASTM A36 Structural Steel
5.2. ASTM A53 Structural Pipe
5.3. ASTM A90 Standard Test Method for Weight of Coating on Iron and Steel Articles
5.4. ASTM A123 Standard Specification for Zinc Coatings on Iron and Steel Products
5.5. ASTM A153 Zinc Coating (Hot-Dip) on Iron Steel Hardware
5.6. ASTM A325 High Strength Bolts and Nuts
5.7. ASTM A500 Structural Steel Tubing
5.8. ASTM B46.1 Surface Texture
5.9. ASTM A325 High Strength Bolts and Nuts
5.10. ASTM B46.1 Surface Texture
5.11. ASTM D3487 Standard Specification for Mineral Insulating Oil in Electrical Apparatus
6. National Electrical Manufacturers Association (NEMA)
6.1. NEMA 107 Method of Measuring Radio Noise
6.2. NEMA HV1 High Voltage Insulators
6.3. NEMA TR 1 Transformers, Regulators, and Reactors
2.7. Tractor Dimensions
1. The tractor curb weight is approximately 24,646 lbs.
2. The trailer shall be designed to be capable of being transported by a tractor with the following dimensions and ratings:
A B C D E F G
206” 55” 62” 322” 38” 33” 50”
GVWR FR. GAWR 2ND. GAWR 3RD. GAWR 4TH. GAWR
56,540 lbs 16,540 lbs 20,000 lbs 20,000 lbs 0 lbs
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