EDMOND ELECTRIC EDMOND, OKLAHOMA

Transcription

1 EDMOND ELECTRIC EDMOND, OKLAHOMA REQUEST FOR QUALIFICATIONS FOR ENGINEERING SERVICES (RFQ15-006) I. INTRODUCTION The City of Edmond Electric is requesting qualifications from engineering firms to provide professional services for an Arc Flash Analysis. II. SCOPE OF PROJECT A. General Scope of Analysis 1. The City of Edmond Electric desires a review of their electric system to ensure that the arc flash protection measures currently in place; or supplemented as a result of this analysis, comply with the NESC 2012 Edition, 2014 OSHA Standards, other regulations, and industry accepted practices as they apply to a municipal electric utility. 2. Edmond Electric will make its current arc flash protection policy available to the selected consultant. a. The 2009, Arc Flash Analysis Project No. OK , covering the City s electric supply stations will available to the consultant for their review. b. Edmond Electric will discuss the in-house analysis of the distribution system external to electric supply stations to the extent the consultant requires. 3. The consultant will meet with Edmond Electric to determine the scope of the system arc flash analysis required. 4. The arc flash analysis shall conform to the following outline: a. The analysis of the Edmond Electric distribution system, external to Edmond Electric s electric supply stations. b. It is desirable, if practical, that the analysis of Edmond Electric s electric supply stations follow a structure similar to the City of Edmond s 2009, Arc Flash Analysis Project No. OK , to facilitate an efficient arc protection policy. c. Report writing and final presentation shall be clear, concise and in a format which can be easily and accurately translated into a

2 policy document. The respondent shall provide Edmond Electric with a representative sample of their proposed report format. d. The study will consist of the following: (i) (iv) data acquisition analysis of electric supply stations individual circuit analysis report writing e. Edmond Electric requests that the consultant determine whether 2012 NESC Table is an acceptable method of defining incident energy for lines and equipment operating at 1000 volts and below. The use of this table is the preferred option if acceptable per OSHA and is found to be otherwise suitable by the consultant. (i) If acceptable the consultant or Edmond Electric may still elect to request additional analysis of specific locations, which will be conducted if mutually agreeable. If unacceptable the consultant shall develop a for analysis of lines and equipment operating at 1000 Volts and below on the Edmond Electric System f. Edmond Electric currently uses Milsoft for system modeling and will provide a copy of the most recent Windmill model of their electric system if required for use in the analysis. g. The consultant shall use analysis methods as prescribed by the 2014 OSHA Rule changes. (i) The current policy covering the Edmond Electric distribution system external to electric supply stations is based on the IEEE 1584 equations applied using the Arc Flash Analytics software, therefore, a different analysis tool is preferred if the analysis is to be based on IEEE 1584 to ensure independence. Electric supply station arc flash policy is based on analysis using a version of ArcPro software deemed by OSHA to be inappropriate for the situation. Therefore, reanalysis will be necessary. The consultant will present a thorough explanation and discussion of their methodology including but not limited to analysis software, process and assumptions. h. The selected consultant shall be capable of modeling multiple operating configurations and providing input into the

3 III. PROJECT DETAIL: development of Hotline Order configuration designed to mitigate arc flash exposure. i. Edmond Electric will receive,as a deliverable, in addition to the final report a copy of the analysis model including input data files and assumptions such that the model can be accessed and updated by Edmond Electric by acquiring the appropriate software application in-house. If the consultant s analysis application of choice is Milsoft they shall deliver the system model database used for analysis with: A. Independent Analysis I. all permanent model enhancements and corrections, implemented to better represent as built field conditions, along with documentation of these additions and corrections in commonly available format, ie. WORD, EXCEL, etc. II. all revisions made for study scenarios and what-if analysis which are not to be field implemented as part of the recommended solution, SHALL be removed from the final model. Documentation of these scenarios and what-if cases in commonly available format, ie. WORD, EXCEL, etc will be provided. 1. The consultant shall prepare and execute an arc flash study which shall include the following elements: a. Gather necessary data to complete a comprehensive arc flash study, utilizing to the extent deemed prudent by the consultant, substation data collected for Project No. OK and data from Edmond Electric s Windmill Model and GIS data. b. Determination of modeling assumptions including but not limited to; arc gap, working distance, etc. The proposed assumptions will be documented and discussed with EE prior to start of analysis. All assumptions shall comply with the more conservative of applicable codes, standards and regulations. Changes to assumptions during analysis will be discussed with Edmond Electric. c. The modeling software functionality will be documented and discussed with EE prior to start of analysis d. Document the maximum Arc Thermal Protective Value requirements for all system configuration scenarios:

4 B. Data Collection (i) By circuit for the system external to electric supply stations For each electric supply station or group of stations having similar arc flash characteristics Verify and document the acceptability of layering of FR clothing to achieve required ATPV e. Document those circuit segments where incident energy exceeds (i) 8 cal/cm 2 25 cal/cm 2 f. Report of the findings and recommendations g. Compare results to Edmond Electric s Current requirement 1. Consultant will be provided with the most recent electric ArcGIS shape files which includes attributes for circuit elements to be modeled including distribution transformers, capacitors, voltage regulators and sectionalizing fuses. (i) The GIS shape file information provided will be preprocessed by Edmond Electric to remove unused fields and fields relating to customers and to provide electric related details only. (iv) (v) The consultant will be provided a cross-reference guide to interpret the ArcFM specific codes, such as those for voltages, phasing, etc. The consultant will need to provide a list of required fields (information) for circuit elements prior to processing of the GIS shape file information by Edmond Electric to facilitate relevant information transfer. Information from the GIS model should provide the electric system information required by the consultant to develop the arc flash model. If the consultant chooses to use Milsoft s Arc Analysis module for their analysis it will be necessary for the consultant to update a copy of the current Windmil model of the Edmond Electric system; or to construct a new model specific to the arc flash analysis Consultant shall notify Edmond Electric if they do not have licensed access to software capable of accessing the ArcGIS database. 2. Field data collection necessary to supplement the data available from the ArcMap model shall be provided by the Edmond Electric upon a detailed request from the consultant. Edmond Electric has the option of

5 requesting varied degrees of assistance from the consultant based on Edmond Electric s resource availability. 3. Field data collection and system modeling shall be based on the current system configuration represented by the shape files provided C. Arc Flash Study 1. An arc flash study shall be performed to determine potential arc flash incident energies and the associated Arc Thermal Protective Values required for all energized electrical system equipment and tasks. Appropriate data modeling based on the current circuit configuration shall be used to determine the arc flash incident energies for the normal operating configuration. Scenario appropriate data shall be used for other selected system configuration scenarios. 2. Incident energies shall be determined at 100% of arcing current and at a reduced arc fault current magnitude with appropriately altered clearing times. The reduced arc fault current shall be justified and documented in the final report. 3. The arc flash calculations for feeders shall include: a. The let-through energy for each feeder protective device. This is the energy on the load side of the protective device. b. The worst case including main protective device. If the equipment is not equipped with a main device, the calculation will be based on the fastest upstream protective device. 4. Arc flash calculations for electric supply stations shall follow the study outline for Project No. OK , if practical, using an arc analysis tool other than ArcPro 1 D. Reporting and Analysis Summary 1. Provide a written report that includes the following: a. Scope of studies performed: The scope shall provide details of what actions were intended to be performed for each aspect of the study. b. Introduction c. Methodology d. Information Sources e. Key Assumptions f. Description of substations and circuits analyzed. 1 OSHA has deemed the current version of ArcPro to be inappropriate for three phase 15kV analysis. ArcPro shall be avoided unless future versions are found by OSHA to be appropriate for this analysis.

6 IV. SELECTION PROCESS g. Modes of operation studied Each mode of operation shall include a detailed write-up indicating areas where incident energy calculations and Arc Thermal Protective Values are higher than calculated in the normal operating mode. Highlight any areas where an increase in current FR requirements is necessary. h. Arc Energy at 100% and at (justified and documented) reduced currents when they provide a worst case i. Over-current Protective Device Changes, Replacements or Setting Changes studied as methods to reduce arc flash hazard exposure. j. Explanation of Data in Arc Flash Hazard Report Tables k. Recommendations for minimum ATPV requirements l. Identification of any equipment found to be over-dutied. m. Recommendations of engineering or operating alterations to reduce incident energy levels or arc flash hazard exposures for equipment with incident energies over 20 cal/cm 2 at appropriate working distances. n. Identification of ATPV requirements exceeding the requirements currently in place. o. All other deliverables as outlined within the Project Scope or Description or Study sections above. The following procedures will be used to select firms 1. A selection committee will review and rate the experience and qualifications of each proposer based on information provided in the response to this RFQ. It is incumbent upon each proposer to furnish complete and relevant information in order to receive proper consideration. The committee may develop a short list of firms. The number of short listed firms would be dependent on the number of responses received. 2. The selection committee may or may not interview the short listed firms. The purpose of an interview would be for you to give a verbal presentation of your firm s qualifications. 3. The selection committee will select a firm for the project and request approval from the Edmond Public Works Committee to negotiate a contract. If negotiations do not result in an agreement, the selection committee will negotiate with another firm. The final contract will be presented to the Edmond Public Works Authority for approval.

7 V. NON-COLLUSION AFFIDAVITS The non-collusion affidavit shall be acknowledged within the online bidding system at the time of response submission and a hard copy required from the successful firm. VI. PROPOSALS All qualification proposals shall be submitted via the City s online bidding system. Bidders are required to register as a provider at to submit a response and enable receipt of any necessary addenda or correspondence. Responses submitted AFTER the time set for receipt of proposals WILL NOT BE CONSIDERED. If you have questions regarding this project, please contact Glenn Fisher, Director Edmond Electric of the City of Edmond at (405)