Provide comprehensive identification and operational details for the substation and transformer equipment subject to maintenance. Accurate metadata ensures proper isolation and prevents accidental energization of incorrect apparatus.
Substation Official Designation
Substation Unique Identifier Code
Geographic Location or Address
Transformer Unit Designation
Transformer Serial Number
Transformer Manufacturer and Model
Primary Voltage Rating (kV)
Secondary Voltage Rating (kV)
Tertiary Voltage Rating (kV) if applicable
Transformer MVA Rating
Date of Last Major Maintenance
Summary of Last Maintenance Findings
Has this transformer experienced any faults or abnormalities since last maintenance?
Describe the nature of faults, dates occurred, and preliminary assessments:
Requested De-Energization Start Date/Time
Requested Re-Energization Date/Time
Estimated Maintenance Duration (hours)
Maintenance Scope Classification
Routine Inspection
Preventive Maintenance
Corrective Repair
Major Overhaul
Emergency Repair
Retrofit/Upgrade
Detailed Maintenance Scope Description
Will maintenance require access to energized compartments of adjacent equipment?
Identify adjacent equipment and required access points:
Current Load Being Carried by Transformer (MW)
Is this transformer operating in parallel with another unit?
Identify parallel transformer designation:
Associated Switchgear and Protection Devices
Device ID | Device Type | Voltage Rating (kV) | Requires Isolation? | Isolation Point ID | ||
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Document the precise switching sequence and isolation boundaries to ensure zero-energy state and prevent inadvertent re-energization. Each step must be verified and time-stamped by qualified personnel.
Total Number of Switching Steps Required
Step-by-Step Switching Sequence
Step Number | Device/Equipment ID | Action | Purpose of Action | Planned Time | Qualified Person Assigned | Risk Level (1=Low, 5=Critical) | ||
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A | B | C | D | E | F | G | ||
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Will switching operations require remote supervisory control?
Identify remote control center and supervisory engineer:
Isolation Boundary Description
Single-Line Diagram Reference Number
Are blind breaks present in the isolation boundary?
Specify location of blind breaks and verification method:
Methods of Verification for Zero-Energy State
Visual Verification of Open Switches
Voltage Detector Testing
Grounding Device Installation
Phase Comparison Testing
Lockout/Tagout Application
Remote Indication Check
Physical Barrier Installation
Number of Lockout/Tagout Points Required
Lockout/Tagout Device Application Log
Device ID | Lockout Type | Tag Number | Applied By | Time Applied | Verification Status (1=Pending, 5=Confirmed) | ||
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Are there any back-feed possibilities through auxiliary systems?
Identify all potential back-feed sources and mitigation measures:
Communication Protocol During Switching Operations
I confirm that all switching steps have been reviewed in a pre-job briefing with all involved personnel
Will parallel or adjacent circuits remain energized during this work?
Specify minimum approach distances and additional safety measures required:
Verify that all required personal protective equipment and grounding apparatus meet specification, are within test dates, and are appropriate for the voltage levels and arc flash hazards present. Grounding is the primary protection against inadvertent energization.
System Voltage Level (kV) for PPE Selection
Calculated Arc Flash Incident Energy (cal/cm²)
Required Arc-Rated Clothing Class
Class 1 (4 cal/cm²)
Class 2 (8 cal/cm²)
Class 3 (25 cal/cm²)
Class 4 (40 cal/cm²)
Class 5 (75 cal/cm²)
Required PPE for All Team Members
Arc-Rated Shirt and Pants
Arc-Rated Coverall
Arc-Rated Face Shield
Hard Hat with Arc Rating
Safety Glasses
Leather Gloves
Insulating Rubber Gloves with Leather Protectors
Dielectric Overshoes
Safety Harness
Flame-Resistant Outerwear
Will insulating live-line tools be required for any part of this work?
Specify tool types, voltage ratings, and last test dates:
PPE and Tool Inspection Verification
Equipment Description | Serial/ID Number | Last Test/Inspection Date | Next Test Due Date | Condition Acceptable? | Compliance Score (1=Fail, 5=Excellent) | ||
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Number of Portable Grounding Sets Required
Grounding Cluster Configuration
Grounding Equipment Specification and Inspection
Ground Set ID | Conductor Size (mm²) | Current Rating (kA) | Last Electrical Test Date | Mechanical Integrity OK? | Clamps and Ferrules Secure? | ||
|---|---|---|---|---|---|---|---|
A | B | C | D | E | F | ||
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Grounding Connection Points and Sequence
Will equipotential bonding be required for the work area?
Describe bonding arrangement and connection methodology:
I confirm that all grounding equipment has been visually inspected and electrically tested within required intervals
Are there any personnel with medical restrictions or PPE exemptions on this team?
Specify personnel, restrictions, and alternative safety measures implemented:
Overall PPE and Grounding Readiness Score (1=Inadequate, 5=Fully Compliant)
Establish robust emergency response procedures and backup power arrangements to maintain grid stability and ensure personnel safety in the event of unexpected equipment failure, re-energization, or other contingencies during the maintenance window.
Is backup transformer capacity available to serve the load during this outage?
Identify backup transformer and estimated load transfer capacity (MW):
Describe load shedding plan or alternative supply arrangements:
Maximum Allowable Outage Duration Before Load Shedding (minutes)
Emergency Re-Energization Procedure
Are mobile generators or temporary power supplies on standby?
Backup Power Resources
Resource ID | Type (Generator/Mobile Substation) | Capacity (MVA) | Location/Status | Deployment Time (hours:minutes) | ||
|---|---|---|---|---|---|---|
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Communication Failure Contingency Plan
Is a dedicated emergency response team stationed on-site during maintenance?
Team size and specialized capabilities:
Estimated emergency response time from nearest facility (minutes):
Emergency Equipment Available On-Site
Fire Suppression System
Fire Extinguishers (CO2/Dry Powder)
First Aid Station
Emergency Eyewash Station
Spill Containment Kit
Rescue Hoist Equipment
Emergency Breathing Apparatus
Insulating Rescue Hook
Are there any hazardous materials stored in the work area?
Hazardous Materials Inventory
Material Name | Quantity/Volume | Storage Location | SDS Available? | Spill Kit Accessible? | ||
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Personnel Injury Response and Evacuation Procedure
Is a helicopter landing zone available for emergency medical evacuation?
Landing zone coordinates or location description:
Nearest Advanced Medical Facility
Travel Time to Nearest Advanced Medical Facility (minutes)
Environmental Contingency Measures
I confirm that all emergency contact numbers have been verified and posted at the work site
Overall Emergency Preparedness Level (1=Poor, 5=Excellent)
Final authorization and verification by responsible authorities. All sections must be completed and verified before final approval. This sign-off constitutes formal permission to proceed with de-energization and maintenance activities.
Requesting Technician Name
Requesting Technician License/Qualification Number
Request Submission Date/Time
Has the requesting technician personally inspected the work site and verified all information in Sections 1-4?
Explain why personal inspection was not possible and who performed verification:
Regional Load Dispatcher Name
Load Dispatcher Authorization Code
Load Dispatcher Review Date/Time
Load Dispatcher Approval: Do grid conditions permit this outage as scheduled?
Specify grid constraints and recommended alternative timing:
Designated Safety Lead Name
Safety Lead Certification Number
Safety Lead Review Date/Time
Safety Lead Verification Checklist
Non-Compliant | Minor Issues | Acceptable | Good | Excellent | |
|---|---|---|---|---|---|
All switching procedures are technically accurate and complete | |||||
PPE selections are appropriate for identified hazards | |||||
Grounding plan provides adequate protection | |||||
Emergency procedures are comprehensive and actionable | |||||
Personnel qualifications are current and adequate | |||||
Communication protocols are clearly defined | |||||
Environmental protections are in place |
Safety Lead Approval: Are all safety requirements satisfied for work to proceed?
Identify specific deficiencies and required corrective actions:
Witnessing Authority Name (if applicable)
Witness Title/Affiliation
Witness Acknowledgment Date/Time
I acknowledge that I have reviewed all sections of this permit and confirm that information provided is accurate to the best of my knowledge
Attach Supporting Documentation (single-line diagrams, risk assessments, equipment manuals)
Upload Photo of Work Site and Isolation Boundaries
Requesting Technician Digital Signature
Regional Load Dispatcher Digital Signature
Safety Lead Digital Signature
IMPORTANT: This permit is valid only for the date/time and scope specified. Any changes to switching sequence, personnel, or work scope require submission of a new permit or formal amendment approved by all signatories. Work must not commence until all signatures are obtained and communicated to the work team.
To configure an element, select it on the form.