Mesa Associates, Inc.
Power Delivery Substations & Switchyards

Substations & Switchyard

Electrical High Voltage Experience

500 kV Substation Experience

  • Last ten years over 200 projects at 500kV substations
  • Developed Independent Pole Operation (IPO) Standard for TVA
  • Example One: Completed 500kV switching station connecting 6 CTs to the 500kV grid
  • Example Two: Converted 500kV yard from a main and transfer bus to a double breaker configuration
Substations & Switchyards

Physical Design

  • Our Physical Design Group develops the following types of engineering documents:
  • Electrical Equipment General Arrangements for the Switchyards and Substations
  • Site Grading and Drainage
  • Structures/Foundations
  • Oil Containment Design
  • Equipment Plans, Elevations, and Sections
  • Control House Layout
  • Grounding Studies
  • Conduit/Grounding Drawings
  • Bills of Material
  • Cable Schedules

Protection Schemes

Commonly used protection schemes:

  • Bus Differential
  • Bank Differential
  • Line Differential
  • Over-current protection
  • Over/Under Voltage protection
  • Over/Under frequency and load-shedding protection
  • Distance Protection
  • Directional Protection
  • Pilot Relaying Protection
  • Breaker Failure Protection
  • Capacitor Bank Protection

Protection & Control Design

Our Protection & Control Design Group develops the following types of engineering documents:

  • Single Line Diagrams
  • Three Line Diagrams
  • Panel Front Views
  • Elementary Diagrams (AC & DC)
  • Equipment & Switchboard

Wiring Diagrams

  • Nameplates and Wiring Tags
  • Isolation & Restoration Work Plans
  • Detailed Work Descriptions
  • Battery Studies
  • Bills of Materials

Telecommunication Design

Our Telecommunication Design Group is responsible for communications between Substations/ Switchyards, including:

  • Digital Microwave Radio
  • Power Line Carrier Relaying
  • Fiber Optic Transport Systems
  • UHF/VHF Radio
  • GPS Radio
  • Spread Spectrum Radio
  • Cellular Phone - Radio Frequency Electromagnetic Field Measurement
  • Wide Area Ethernet
  • Battery & Charger Systems
  • High Voltage Protection for Telephone Lines
  • Telemetering
  • Telephone Systems

Our Telecommunication Design Group develops the following types of engineering documents:

  • Single Line
  • Connection Diagrams
  • Jumper & Cable Diagrams
  • Line-to-set Connection Diagrams
  • Panel Arrangement
  • Bill of Material
  • Cable Schedules/Indices

Relay Settings & Programming

SEL Relays:

  • 121
  • 221
  • 287
  • 287V
  • 311B
  • 311C
  • 311L
  • 321
  • 351
  • 351S
  • 351R
  • 387
  • 421
  • 501
  • 551
  • 587
  • 587Z
  • 2020
  • 2030

ABB Relays:

  • REL-512

Areva Relays (formerly GEC):

  • Optimho
  • LFZP114
  • MCGG22
  • MBCH
  • MFAC

GE Relays:

  • F30
  • F35
  • F60
  • B60
  • D60
  • T60
  • IAC
  • GCX
  • GCY
  • JBCG

Oil Containment Experience

Phase 1 Study:

  • Station Evaluation
  • Spill Prevention Control and Countermeasure (SPCC) Plan

Phase 2 Detailed Design:

  • Containment & Diversionary Structures
  • Storage

Phase 3 Implementation:

  • Remediation
  • Construction
  • Construction Management
  • Procedures
  • Inspection
  • Maintenance
  • Operation
  • Training

Transmission & Distribution

  • Experienced in Transmission-to-transmission Design
  • Experienced in Transmission-to-distribution Design
  • Performed Independent Review of a Major Utility’s Transmission to Distribution P&C Standard
  • Distribution Clients
  • Alabama Power
  • E ON.US
  • Knoxville Utilities Board
  • Progress Energy Florida
  • Transmission Clients
  • Progress Energy Carolina (PEC)
  • Progress Energy Florida (PEF)
  • Southern Co. (APCO, Gulf Power, Mississippi Power)
  • TVA
Substations & Switchyards

System Planning, Studies, & Analysis

  • Load Flow Analysis
  • Short Circuit Analysis
  • Load Growth Projections
  • Economic Best Practices
  • Grounding Analysis
  • Software Experience
  • Etap, Milsoft’s Light Table & Windmill, Aspin, CAPE, CDEGS

SCADA Design and Programming

  • Siemens, Telvent, and Advanced Control Systems RTUs and controllers
  • Integration with relays, breakers, metering, other SCADA systems
  • Approximately 50 RTU configurations per year, last four years
  • Previously, Mesa was the sole provider of RTU configurations for all TVA contracted RTU designs

Electrical Panel Fabrication

  • Relay Panel Fabrication
  • SCADA Panels Fabrication
  • Instrument Tag Engineering Service
  • Complete Documentation
  • Installation/Start-up Assistance
  • Procurement Services

Substations & Switchyards Experience

  • Over 120 Professional, Technical, and Administrative Employees
  • 24 Registered Professional Engineers working in the Electrical Division
  • Over 2000 years of substation and switchyard experience

2000 years can be broken down as follows:

  • 40 years of TPS Planning Experience
  • 1475 years of Design Experience
  • 325 years of Communications
  • 110 years of Field Testing and Construction
  • 90 years of Operations Experience
  • Completed over 2000 substation design projects over the last 12 years.

Types of Projects

  • Breaker Replacement
  • Line Relay Replacement
  • “Greenfield” Station
  • Transformer Bank Replacement/Addition
  • Metering Upgrades
  • Capacitor Bank
  • Reactor Bank