Donovan Ashley Moore Mba, Pmp

1 G4 ENGINEERING CONSULTANTS INTERNATIONAL INC 2 National Tool & Engineering Institute Renewable Energy Efficiency Technology Level 4 Apply Occupational Health & Safety Regulations, codes and Practices in the Work Place (ETERNE0072B) Job Task Analysis for Changing of Defective Insulator on 138 kV Transmission Tie line – Duhaney to Tredegar Names: Donovan A. Moore Date: May 15, 2019 3 Table of Contents OVERVIEW .................................................................................................................................................... 3 Situational Background/Scenario.............................................................................................................. 3 Purpose ..................................................................................................................................................... 4 Scope/Limitations ..................................................................................................................................... 7 INTRODUCTION .......................................................................................................................................... 15 GENERAL SAFETY PROCEDURE/SAFE WORK PRACTICES............................................................................. 3 SPECIFIC ACTIVITIES/WORK PROCEDURES .................................................................................................. 3 Roles and Responsibilities ......................................................................................................................... 8 Preparatory Activities................................................................................................................................ 3 Switching and Earthing Procedures ......................................................................................................... 4 Execution of Corrective Works.................................................................................................................. 3 Closure of Works for Safe Re-Energized line ............................................................................................ 4 Restoration of Line Section to Grid ........................................................................................................... 4 IDENTIFICATION OF HAZARDS, RISKS AND CONTROL MEASURES ............................................................. 3 DEVELOPMENT OF RISK REGISTER ............................................................................................................... 3 CONCLUSION ................................................................................................................................................ 3 4 OVERVIEW Situational Background/Scenario * G4 Engineering Consultants have been apprised by the Management of JPS that on April the 25th, 2019, an insulator flash over occurred on Tower 19, approximately 5.45 km from the Duhaney Substation, in the hill range overlooking the Caymanas plane. SCADA system indicated phase to phase faults magnitude of only 650 Amps for a short duration of 0.0005 microseconds; a condition which was not of sufficient magnitude and duration to initiate relay protection mechanisms. However, the incident resulted a damaged insulator on one phase of the 3 phase transmission line Star 138kV system between Duhaney and Tredegar. The insulator indicated surface damage, suspected by unknown causes (which could be appropriately attributed to an aged di-electric). Based on its contact with Power Utility firm, G4 Engineering Consultants were engaged to effect replacement to the damaged item in accordance with Engineering Design, Transmission & Distribution (T&D) Standards, and related Safety & Work Procedure Standards, relevant to the corrective maintenance process. Further, the Management of JPS, (headed by Board chairman, Dr Lunan), required that a comprehensive Job Analysis be documented and presented before execution. The purpose of this documentation was to test the readiness of G4 Consultants regarding its level of knowledge, technical capability and capacity to operate within compliance. Regardless, the existing condition was to be treated as urgent for repairs, as the compromised insulation condition could likely escalate if left un-attended. This tie line is essential for restoration within the next three (3) to five (5) days as typical load profile indicate that demand conditions within the Kingston Metropolitan area will require this circuit to be in tact as a means of supply both MVAs and MVARs to be imported from Old Harbour into 5 Duhaney via Tredegar. The safe restoration of this line is required for ensuring system stability and supply reliability over the next few days to come, and beyond. * The actual scenario above is purely fictitious and was generated to inspire creative thought in depicting a real-world condition, that would help to enrich the context for response to an assignment question, and the interactive discussion/presentation to follow. Purpose This document shall seek to create a comprehensive Job Safety Analysis for the Corrective maintenance/repair activities for replacing a damaged insulator on the Duhaney to Tredegar 138 kV Transmission line on the JPS Power Grid. As a prerequisite for achieving the stated intent, the required job processes and procedures, necessary for executing the work activity shall be thoroughly outlined in the document. The document will necessarily identify all the risks associated with the job, and how such risks can be appropriately managed. Consequently, a Risk Registry will be included as an informational source for personnel, practitioners, reviewers and other interested parties to reference in accordance with their respective needs. Scope/limitations The core of the substance in this document, namely, the Job Analysis content, and all its components shall be understood as only pertaining to the steps required to safely execute the work for the damaged insulator in question, as described above. Whilst general principles can be applied to similar job activities of insulation replacement on the T&D System at the transmission level, the Job Analysis herein contained is specifically for the job described for the scenario depicted. 6 INTRODUCTION This Job Safety Analysis document shall provide a comprehensive view of the approach, scope and purpose of the job/tasks to be undertaken, and all the relevant safety standards and requirements to ensure that all personnel are protected from undue exposure to hazards that may exist within the specific work environment. The documentation will highlight the roles and responsibilities of all assigned personnel on the job, pertaining to the activity to be undertaken, and will further describe all the sequential processes and activities from the preparatory stage (before actual execution) to the final stages and closure of the work operation. The intent of such thorough documentation is to provide a meaningful sample for appropriate adaptation and application to other assignments, similar or otherwise. The content of any other Job Analysis shall be specific towards those jobs only. However, the next section to follow provide extracted samples of general guidance that are broadly relevant to working on Overhead Transmission lines. 7 GENERAL SAFETY PROCEDURES/SAFE WORK PRACTICES Situational Background/Scenario * G4 Engineering Consultants have been apprised by the Management of JPS that on April the 25th, 2019, an insulator flash over occurred on Tower 19, approximately 5.45 km from the Duhaney Substation, in the hill range overlooking the Caymanas plain. SCADA system indicated phase to phase faults magnitude of only 650 Amps for a short duration of 0.0005 microseconds; a condition which was not of sufficient magnitude and duration to initiate relay protection mechanisms. However, the incident resulted a damaged insulator on one phase of the 3 phase transmission line Star 138kV system between Duhaney and Tredegar. The insulator indicated surface damage, suspected by unknown causes (which could be appropriately attributed to an aged di-electric). SPECIFIC ACTIVITIES/WORK PROCEDURES Roles & Responsibilities In order to ensure that all relevant work personnel are fully aware, engaged and adequately prepared to safely and effectively execute the Job Task to be undertaken, each personnel and his/her role in the work activity must be identified. In addition, this step is necessary to facilitate the clear lines of communication, interaction and consultations with all the relevant personnel that will be involved with completing the assigned Job Task. The following personnel along with their roles and responsibilities were identified as important to delivering the specific job, to the required standards: 8 . DESCRIPTION OF PERSONNEL'S ROLES AND RESPONSIBILITIES FOR SPECIFIC TRANSMISSION LINE CORRECTIVE WORK TABLE 1 - COMPONENT OF THE REQUIRED PREPARATION ACTIVITES FOR SAFE EXECUTION OF TASKS ON H.V. TRANSMISSION LINE JOB FUNCTION/TITLE NATURE OF RESPONSIBILITY NO. OF PERSONNEL Advanced Technical/Business Qualfications/Professional Certification. Over 15+ years of progressive/distinguished experience in Power Industry Advanced Technical/Business Qualfications/Professional Certification. Over 10+ years of progressive/distinguished experience in Power Industry 1 Engage, motivate and facilitate teamwork based on standards of excellence, safe work practices through policy enforcement, consultations/wrok group discussions, planning/coordination 2 1. Coordinate work preparation activities 2. Lead out in Tailbaord Discussions. 3. Provide direct supervsion/instructions for tasks 4. Control on-site hazards. 5. Take interventive actions and manage communication 6-8 Obey instructions, Safety Standards, conform to required work practices, conformance to safety requirements, hazard control procedures/system and ensure execution of tasks/sub-tasks to avoid all injuries/danger to self and fellow team-members Technical/Academic Qualifications at Undergraduate Degree/NVQJ Level 5. At least five (5) years of experience in Power Systems Operations & Mtce. D2 - D3, T1-T2 Switching Authorization Diploma/Assoc Degree/NVQJ Level 4 Technical Qualifications. At least three (3) years of experience as a Competent Staff. Specialized JM/LM Training up to Grade A, Red Seal or JM/LM Level 1. T1 - T3 Switching Authorization Trained and Certified competent Line Personnel, with High School Diploma/5 ordinary level subjects (preferably, NVQJ-Level 2 -3). Authorization to switch at D1 - D3, T1 desirable Define Overarching Safety Policy, Develop Corporate Strategy for Risk Management, Oversee conformance to Legal/Regulatory Standards 1 Director of T& D Grid Operations Implement framework for Technical Standards conformance in Transmission & Distribution portfolio, in accordance with firm's Safety Policies, and Corporate Risk Mgt. Stategies. Provide general managemnt oversight to work processes and resource allocations 1 Manage assigned project and operational deliverables, verify and pre-approve work resources, Enforce conformance to Job Safety & Work Parctices Supervisor/Leadman - (Red Seal/JM-LM 1) Coordinate assigned work/field activities in conformity to established standards, through adherance to the highest levels of Safety practices to ensure full control of hazards and total prevention of accidents on the job Line Technician(s) Execute assigned tasks to appropriate standards, whilst adhering to safety rules/guidelines, instructions and procedures, to prevent injury to self and fellow team members REQUIREMENT OF TECHNICAL STATUS Create the necessary business, legal/contractual frameworks both from a business & engineering standpoint, through high level application of existing and immergent industry standards/trends Ensure adequete provisions of resources for works standards, hazard/risk mitigation. Provide Approvals for Job-Site Acess, Outage/Live Line Work Plans, Permission to Work (PTW) and contingencies Chief Technical Officer Operations Manager - TLM ROLES FOR SPECFIC JOB TASK 9 Preparatory Activities In order to ensure that all relevant work personnel are fully aware, engaged and adequately prepared to safely and effectively execute the Job Task to be undertaken, each personnel and his/her role in the work activity must be identified. In addition, this step is necessary to facilitate the clear lines of communication, interaction and consultations with all the relevant personnel that will be involved with completing the assigned Job Task. The Preparatory processes will be sub-divided in two (2) components/stages; Stage 1 – Planning of Standards, Procedures & Safety Conformance, and Stage 2 – Planning of Resource Requirements & Job Task Delivery. Both related stages are highlighted in the respective lists below: STAGE 1 PREPARATION Under Stage 1 of the preparation for execution, the actions and decisions outlined must be carried out before resources are committed and prior to actual work on the transmission system. These include (but are not necessarily limited to): 1. Clear description on the nature of the work(s) to be done 2. Identification of all hazards and associated risks that may exist, or may arise 3. Discussion and consultation with JPS System Control & Planning Department– the ultimate Technical Controllers of the Power System’s Grid a. This communication would include request for approval of line section deenergization (if an outage is required) or request for use of Hot Stick/Live Line Method (if working on the line section in an energised state is required) b. Approval would be granted on technical considerations such as Customer’s Reliability and System/Power Grid Stability 10 c. The Applicable Information Technology Software (or otherwise manually prepared forms) would be accessed and the essential details for the work to be carried out placed in the forms. The completed form(s) with any necessary attachments/data sheets would be submitted by some senior staff personnel at the Transmission Line Maintenance (TLM) level. (Please note that if JPS were to outsource this technical business operations component to a capable Engineering firm, as mentioned in the scenario, the request would be submitted by a person of equivalent rank/seniority, such as a Supervisory/Lead personnel and/or an Operations/Maintenance Manager). 4. Planning/Work Team Meeting to discuss work procedures, hazards risks and safety, pre-work responsibilities (who is responsible to do and get what), and on-site responsibilities a. Included here is specific instructions, special pre-cautions to work team members b. Accommodations must be given for staff interaction, feedback and request for clarifications 5. Verification of Switching device location, identification numbers and operating conditions/status 6. Emergency procedures – Plans and Contingencies for any undue exposures to hazards causing accidents and injury. This will include First Aid Response, Emergency extraction, rescue and transportation for medical treatment 11 7. Work Environment control – Access Restrictions/Allowance, Limitations of Access, Defined Work Zone(s), steps to mitigate environmental impact (if any).Site mapping/layout with established boundaries STAGE 2 PREPARATION Under Stage 1 of the preparation for execution, the actions and decisions outlined must be carried out before resources are committed and prior to actual work on the transmission system. These include (but are not necessarily limited to): Following the completion (or advanced development) of issues addressed in STAGE 1 are obtained, Stage 2 Preparation would include actions/decisions such as: 1. Determination of the tools, equipment, vehicles/machinery, Safety control devices, protective equipment, administrative controls and all other resources are made ready for the job to be carried out 2. Identification and notification of actual work team members, that must include an Authorized Person(s), Competent Persons and Qualified Persons, with the requisite training, credentials, knowledge, certification and competences to do the job effectively and safely 3. Confirmed Work dates and resources based on all necessary approvals for works at Departmental, System Control/Grid Operations and Corporate levels of the Power Utility Firm. 4. Mobilization plans to work site, with plans for ample on-the-site preparations before any work is done 12 Switching & Earthing Procedures There are two (2) choices of approach that can be taken to safely execute the corrective works on the transmission line in question: (1) De-Energization and shorting to earth of the line and (2) Use of a Live Line Method (Hot stick/Live Line Tools, Insulating/Rubber Gloves or Barehanded/Equal-potential). However, this Job Safety Analysis documentation, shall select to use the De-Energized Work Method (1), to safely complete the task of changing the defective insulator. For this method chosen, the applicable hazard control measures that will be applied as shown in the modified Hierarchy of Controls diagram shown here: Considering the circuit diagram below, the schematic shall be used to provide a sequence of steps for application of the De-Energization Method. This is known as a Switching Order. 13 197/9-151 197/9-830 197/9-837 197/9-839 TREDEGAR S/S 197/9-106 197/-/-/9-537 20/9-739 20/9-730 20/9-737 DUHANEY S/S SCHEMATIC DIAGRAM: SECTION OF JPS GRID – TRANSMISSION TIE LINE BETWEEN DUHANEY & TREDEGAR SUB-STATIONS 14 Steps for Application of De-Energized Circuit Method These are the steps for de-energising, isolating and grounding the 138 kV Transmission Tie Line between Duhaney and Tredegar Sub-stations, on the JPS Electric Grid: AT TREDEGAR (1) Confirm that By-Pass switch, 197/8-838 (not shown in the diagram) is in the Open Position (2) Trip Circuit Breaker 197/9-830, and confirm the breaker indicates open (3) Confirm that By-Pass switch 197/9-539 (not shown in schematic) is in the Open Position (4) Trip Bus Tie Breaker 197/9-530, and conform the breaker is indicating open (5) Open Isolator 197/9-539 (6) Open Bus Breaker Isolator 197/9-839 AT DUHANEY (7) Confirm that By-Pass switch (not shown) is in the Open Position (8) Trip Circuit Breaker 20/9-730, and confirm the breaker indicates open (9) Open 20/9-739 (looking away from the bus/towards the line) (10) Open Tie Line Isolator Switch 197/9-151 (Note an interlocking device/mechanism may exist that will prevent closing earth switch 197/9 – 106) (11) Test/Buzz Line for verification of De-Energized status (12) Close Earthing Switch 197/9-151 (13) Apply Additional Short & Ground Equipment (of suitable fault current rating) mid span away from work location/tower to be worked on) (14) Specify/Impose Physical Barriers on work space 15 (15) Issue Permit to Work Document from Authorized Personnel (in Charge of Switching) to Competent Person (in Charge of Work) Execution of Corrective Works As should be expected no work shall proceed on any section of the Power Utility Grid until the following conditions are met: 1. The decision is made at the Preparatory Stage, that the De-Energized Method (in this particular case) is to be used, and all the necessary preparations to include resources, notifications and approvals have been granted 2. The Switching Process as outlined in the section above regarding Method of Isolation have been executed by an Authorized Person (a competent, technically knowledgeable and trained/certified personnel who is given the authority in writing) to coordinate the re-configuration/switching of the system/circuit, under the authority of the System Control Department (the custodians of the JPS Electric Grid) The steps below indicate the sequence of activities for doing the Corrective Work of changing the damaged insulator: (1) Transport Personnel, materials and tools to work site (2) Set Up Work Site a. Lay Out Tools/Equipment b. Create barriers/Boundaries around established perimeter c. Clean/prepare tools for use 16 (3) Hold Tailboard Meeting on site a. Assign roles (ideally agreed prior in preparation stage), identify person in charge, designated climbers/aerial unit operators, ground men, Spotters/flag men, First Aider b. Discuss work procedure c. Identify hazards and associated risks (as a formal process this entails recording hazards/risks identified on appropriate instrument/forms d. Discuss and agree on how to avoid hazards/mitigate risks (4) Put required Controls in place and/or confirm that they are adequately in place (5) Have each personnel sign on to the Tailboard document (6) Issue Permit-to-Work/All clear to commence work (7) Take up assumed/assign work positions and affix tools (8) Remove old insulator (approach is dependent on tools applied and type of insulation configuration being used) (9) Replace new insulator (10) Inspect adjacent insulator conditions and determine need for change (11) Repeat steps (8) and steps (9) if necessary (12) Do quality control checks – item(s) properly anchored, insulator angle correct, clearance between phases maintained, conductor at proper sag/tension 17 Closure of Works for Safe Re-Energization (1) Remove Tools, equipment, additional short and ground and personnel from line section (2) Sign of Tail Board Conference Document (3) Cancel Permit-to-Work (and any other access/authorization documents) (4) Give notification of Clearance-to-Energize line section to Authorized Person (5) Proceed with re-energization steps (6) Stand Clear for re-energization