TITLE:
RECOMMENDED: E. Syed, P. Eng.
APPROVED: C.S.Malone, P.Eng.
REV. DATE: 2007-05-14
NO:
REV:
Latest revisions at: www..hydroottawa.com
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 1 of 14

REVISION SHEET
Revision
0
Description Date Initial
Original Document 2007-05-14 es/csm
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 2 of 14

1.0
INTRODUCTION ............................................................................................................ 4
2.0
REFERENCES.................................................................................................................. 4
3.0
SCOPE ............................................................................................................................... 4
4.0
DEFINITIONS .................................................................................................................. 5
5.0
PROGRAM DETAILS..................................................................................................... 5
6.0
TYPICAL INSPECTION, TESTING AND MAINTENANCE ................................... 7
6.1 R ESPONSIBILITIES AND N OTIFICATIONS ....................................................................... 8
6.2
6.3
6.4
V ISUAL AND M ECHANICAL I NSPECTION ...................................................................... 9
M
AKING
D
ECISIONS
..................................................................................................... 9
C
OSTS AND
C
OST
S
HARING
........................................................................................ 10
7.0
INSPECTION AND REPORTABLE ITEMS ............................................................. 10
8.0
MAINTENANCE............................................................................................................ 11
Appendix A: Template of Letter related to Vault Inspection and Maintenance........................... 13
Appendix B: Vault Inspection and Maintenance Data Sheet............................................. 14
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 3 of 14

These instructions offer direction for the detailed maintenance and inspection for all types of primary serviced vaults and customer owned substations on Hydro Ottawa’s
Distribution System.
• CEATI - Report 3040 - Overview of Statistical Methods and Models and Analysis of their Suitability for Prediction of the End-of-Life of Equipment
• E&USA Electrical Utility Safety Rules
• E&USA Work Protection Code
• Hydro Ottawa – DFS0008: Time and Date Format Standard
• Hydro Ottawa – Asset Management Plan for Distribution Vaults
• Hydro Ottawa – GCG0001: Underground Secondary Cable Termination and Testing
• Hydro Ottawa – ECS0012: Condition of Service
• Hydro Ottawa – GCS0015: Thermographic Scanning of Power Lines and Distribution
Apparatus
• Hydro Ottawa – GIG0002: Digital Data Submission Standard for Inspection and
Maintenance Programs
• Hydro Ottawa – UIS0001: Padmount/Kiosk Transformer Inspection
• Hydro Ottawa – UIS0002: Padmount Switchgear Inspection
• Hydro Ottawa – Work Instructions: HEA-007.0 (Sep 19/06)
• NETA – MTS-1997 - International Electrical Testing Association, “Maintenance
Testing. Specifications for Electrical Power Distribution Equipment and Systems”
In order to meet the guidelines and requirements set in place by regulators, Hydro Ottawa has adopted a three-year cyclic inspection program with the intention of identifying system deficiencies (deteriorating or defective equipment, abnormal conditions, safety hazards, etc.). The cyclic inspection program will ensure all areas (urban, rural, and difficult access), will be visited, to detect deficiencies before they lead to system failures that may:
• Impair the safety of Hydro Ottawa employees or the public at large;
• Impair system reliability and reduce the quality of service to our customer;
• Seriously reduce the life expectancy of equipment and increase costs;
• Adversely affect the environment.
• Damage adjacent building(s)/structures(s)
This procedure includes a more detailed inspection program that will be part of the regulatory 3-year cycle inspection with device maintenance methods as required. It is impossible to write a detailed specification of everything to look for while inspecting the
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 4 of 14

system so, the inspector is to use their own and others’ experience and knowledge when deciding the priority of the repair.
‘GIS’ means Hydro Ottawa’s Geographical Information System
‘Critical Customers’ means Hydro Ottawa customers classified as specially handled customers for power restoration.
‘Loop System’ means that the transformer vault has two primary electrical supply feeds, which are connected to separate load-breaking switches. These switches are connected to a common bus to supply the transformers via protective devices. Both load-breaking switches are normally closed so that the supply is looped in and out of the building. This is commonly used in the underground supply areas.
‘Shared Vault’ means that the capacity of the vault is shared between the customer at the location of the vault and surrounding customers fed from Hydro Ottawa’s equipment in the vault.
‘Single Radial Vault’ means that the transformer vault has only one supply circuit feeding the vault transformers through a protective device. This system is used when the vault is fed from a distribution circuit.
‘Dual Radial’ means that the transformer vault has two primary electrical supply circuits, which are connected to separate load-breaking switches. These switches are connected to a common bus to supply the transformers via protective devices. Only one of the two load-breaking switches is closed during normal operation while the other remains open in a back-up capacity. This system is used exclusively in certain overhead supply areas.
Hydro Ottawa’s Distribution System consists of various arrangements, which include, customer owned padmount transformers, substations and customer owned switchgear vaults in customer-owned buildings. In some vaults, the primary equipment and transformers are owned and maintained by Hydro Ottawa. (Refer to Condition of Service document, ECS0012, to determine demarcation).
In parts of the Hydro Ottawa service territory, there are also vaults that the equipment is shared between the customer and Hydro Ottawa. These vaults are to be referred to as
Shared Vaults. The costs associated with the maintenance of them are also shared as per the original service agreement. The specifics relating to sharing of capacity and costs are defined by the service vault agreement for each application. Agreements generally last for a term of fifty years with an option to renew subject to the same terms and conditions.
The following definitions apply to Secondary Distribution Vault Agreements:
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Full Service: Hydro Ottawa has 100% use of the vault capacity. The Customer constructs the vault (including ventilation) and ducts to street, and maintains and repairs the vault (except for cleaning which is shared 50/50 with Hydro Ottawa). Hydro Ottawa installs all switchgear and cables. Typical power available to Hydro Ottawa is in excess of 1000 kVA
Limited Service: Hydro Ottawa shares the use of the vault capacity with the Customer
(maximum capacity allowed for the Customer is 400 A, @347/600 V). The Customer constructs the vault (including ventilation) and ducts to street, and maintains and repairs the vault (except for cleaning which is shared 50/50 with Hydro Ottawa). Hydro Ottawa supplies and installs incoming cables and switchgear. Typical power available to Hydro
Ottawa is approximately 800 kVA.
Shared Three-Phase Conventional Switchgear: Hydro Ottawa shares the use of the vault capacity with the Customer (maximum capacity allowed for the Customer is specified in the agreement and is sized appropriately for the initial customer demand in kVA). The Customer constructs the vault (including ventilation) and ducts to street, pays for switchgear (must be acceptable to Hydro) and maintains and repairs the vault
(including cleaning). Hydro Ottawa supplies and installs incoming cables and is also responsible for maintenance of the switchgear. Typical power available to Hydro Ottawa is 500 kVA or more.
Shared Three-Phase Reyrolle Switchgear: This is simply a special case of Shared
Three-Phase Conventional. Hydro Ottawa shares the use of the vault capacity with the
Customer (maximum capacity allowed for the Customer is specified in the agreement and is sized appropriately for the initial customer demand in kVA). The Customer constructs the vault (including ventilation) and ducts to street, pays for switchgear (at one time
Hydro supplied Reyrolle switchgear for the use of customers) and maintains and repairs the vault (including cleaning). Hydro Ottawa supplies and installs incoming cables and is also responsible for on-going maintenance of switchgear. Typical power available to
Hydro Ottawa is approximately 400 kVA.
Hydro Ottawa has developed an Asset Management Plan for Distribution Vaults that provides information on life cycle activities. As per this program, determination of asset life, replacement plan and availability of a particular asset (i.e. cables, switchgear and transformers) is covered, provided that the equipment in the vault is owned by Hydro
Ottawa.
In vaults, normal maintenance activities involve cleaning, torquing, calibrating relays, confirming OCB oil level, maintenance of incoming load interceptors, distribution transformers, potential transformer compartments, and lightening arrester compartments.
Due to supply configuration, not all the vaults have the same impact on the system reliability and therefore not all vaults will be shutdown for regular asset level inspection or maintenance. As a good utility practice, Hydro Ottawa has adopted a model based on the condition and reliability to determine the maintenance and inspection cycles. This strategy helps with effective planning, safe operation, and costs reduction. This model also ensures that these programs meet the minimum inspection and maintenance requirements per the Ontario Energy Board (OEB) Distribution System Code.
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 6 of 14

The overall scheme for distribution vaults is further explained in Table 5.1:
Table 5.1: Primary Service Inspection Priority Levels
5 Core loop, highest 2 priority levels of Critical Customers, 44kV stations
4 Non Core loop, next 2 levels of Critical Customers, remaining secondary distribution vaults
3 Dual Radial, Remaining Key Customers
2 Single Radial >500 kW
1 Single Radial ≤ 500 kW
Based on the reliability priorities made above in Tables 5.1, Hydro Ottawa has set minimum specific detailed asset level inspection cycles for vaults (see Table 5.2) to be followed once good baseline data is available in addition to meeting the three-year minimum OEB regulatory check.
Table 5.2: Distribution Vaults Minimum Detailed Inspection Cycles (years)
Priority
Eqpt. Type
Air Metal-
Clad
Switchgear
1
6-yr
Overhead
Air
Switches
Vacuum or
SF
6
Switchgear
6-yr
9-yr
2
6-yr
6-yr
9-yr
3
3-yr
3-yr
6-yr
4
3-yr
3-yr
6-yr
5
3-yr
3-yr
3-yr
Oil Filled
Switchgear
9-yr 9-yr 6-yr 6-yr 3-yr
If a particular vault is subject to heavy contamination, moisture, or vibration, the cycle duration in Table 5.2 can be reduced.
Documented inspection of vaults may consist of infrared scanning, visual inspection of electrical equipment, and civil inspection of vault.
It is expected that all vaults identified, follow these proposed minimum inspection cycles.
However some of the vaults may be maintained more than the specified frequency based on customer requirements and/or Hydro Ottawa analysis due to system reliability.
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 7 of 14

Before maintenance can be carried out, all the paperwork and notifications as per Utility
Work Protection Code and EUSA Rule Book are to be carried out and verified.
Hydro Ottawa’s Conditions of Service document (ECS0012) also defines additional roles and responsibilities for both Hydro Ottawa and the customer. Customers are required to report to Hydro Ottawa any lack of or substandard operation of protection equipment within the next business day. For reporting, customers can send an email to vaultcoordinator@hydroottawa.com
.
Generally notifications to customers, by Hydro Ottawa staff, are provided 48-hours before any scheduled maintenance/inspection or as per the agreed terms and conditions of
Hydro Ottawa’s Conditions of Service document (ECS0012). It is important that the customer is aware of the actions and notifications required for them to complete. An accurate communication record (e.g. email, letter request) is important to ensure timely coordination
The process is further explained in Figure 6.1: Vault Maintenance Request Flowchart.
Request for Maintenance
Shutdown
Field Request?
No
Customer
Request?
Yes
No
Yes
Maintenance
Inspection
Group?
Yes
No
Inform Customer of Maintenance requirements
Yes
HOL Owned?
Schedule
Shutdown and apply for PCI on customer's behalf
Operations
Planning to contact the
Customer Rep.
Maintenance
Required?
Yes
Contact Supervisor, and schedule shutdown with the customer
Approval from
System Planning
Desk required
No
No
Upgrade
Required ?
No
Yes
Yes
Perform
Maintenance
ESA Authorization and shutdown arranged
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0
Emergency
Follow-up?
Update Contact info, if needed
Contact
Commerical
Design
Update Records
Page 8 of 14

Figure 6.1: Vault Maintenance Request Flowchart
1. Before Hydro Ottawa staff accesses a vault, they shall observe the area outside the vault for any signs of failure and approach the vault door with caution. The temperature shall be tested by hand before any attempt is made to open the door, as an exceptionally warm door may be the sign of fire inside the vaults. In such cases,
Fire Department should be called.
2. No Hydro Ottawa staff shall enter a vault that contains fire, electrical arcing, smoke or any other hazardous condition, until after the hazardous condition has been eliminated.
3. Collect data as per Vault Maintenance & Inspection Data Sheet (Appendix B)
High priority problems should be attended to immediately. Judgment must be exercised whether to repair medium and low priority deficiencies while on site. The decision will be affected by the inspections team (personnel skill set and equipment used) and nature of problems found. The priority is to complete the system inspection, and identify and repair equipment before it fails or causes personal injury.
• High priority or “urgent” problems should be repaired immediately, or as soon as practicable. High priority items are those that are likely to cause an outage, damage equipment, or pose a significant safety or environmental risk i.e. loose connections, exposed electrical hazards, operational hazards, overheating equipment, etc.
Immediate isolation of defective equipment may be necessary.
• Medium priority items are those that if left unattended could lead to a future problem i.e. incorrect records, not visible or missing or incorrect nomenclature, unit cleanliness (e.g. dust film, cob webs, etc.), rust, etc.
• Low priority items are not likely to cause an outage, or pose a safety risk.
Examples include mostly aesthetic issues, grading or base levelling issues, etc.
• Inspections versus Maintenance: Detailed inspection cycles are to be maintained as per Table 5.2: Distribution Vaults Minimum Inspection Cycles, however a health indicator to maintain a particular switch maybe difficult to define.
Normally, the physical state of apparatus in a vault would dictate what type of maintenance activity or activities that are necessary and may vary from general cleaning and connection health check (torque and grease) to complete overhaul or refurbishment. The inspectors should use their knowledge, experience and system requirements when deciding if a field condition should be reported for further repair, refurbishment or replacement. To perform maintenance activities, issues pertaining to shutdown costs and full/partial shutdown requirements to be determined.
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 9 of 14

All associated costs are to be captured as per Hydro Ottawa’s financial policies as available through Assets Planning Department. Costing may also include customer contributions as per established Operating and Maintenance Agreements between the customer(s) and Hydro Ottawa or Appendix G from the Conditions of Service.
This inspection requires reporting on each device rather than “reporting by exception.”
Reportable items are described on the Vault Inspection and Maintenance Data Sheet
(Appendix B), and the scope.
Maintenance and inspection performed will relate to the following key areas of concern:
• Mechanical Operation
• Insulation Condition
• Electrical Integrity
• Equipment Anchorage
• Equipment security
• Grounding and bonding
• Identification and Nomenclature
• Civil Structure
Hydro Ottawa’s System Operations Department will assist with this inspection program by issuing a set of maps/schematics and project folders (blue packages) each year for specific vaults to be inspected. The inspectors will complete the attached report (see
Appendix B), detailing any problem discovered with its location, and mark-up the map/schematic provided. The deficiency lists and schematics are to be returned to prioritize any remedial work and correct records as needed.
If required, use the ‘Remarks’ area to expand upon any deficiencies noted on the data sheet, or identify any other deficiencies found.
Please note – If an “urgent” problem is discovered through the inspection and maintenance process that cannot be repaired at the time of maintenance and inspection, the inspector/maintainer will notify the area supervisor and the System Control Centre immediately, so the problem can be remedied as soon as possible.
The following maintenance procedure shall be followed by either Hydro Ottawa crews or its approved contractor when maintaining equipment that is owned by Hydro Ottawa or in the case where a customer has requested, the maintenance and inspection to be carried out by a qualified contractor on customer owned equipment.
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 10 of 14

8.1 Before any switching is performed, a complete visual check of the physical appearance of the vault and all equipment shall be completed for possible mechanical or electrical hazards. The vault shall be isolated and de-energized following safe work procedures, prior to any attempt at an inspection of the apparatus. Once the isolation is established, proper de-energization work practices must be performed.
8.2 Vault maintenance work generally involves cleaning, torquing and maintenance of such things as incoming load interrupters, distribution transformer, potential transformer compartments, lightning arrester compartments, relays, and oil circuit breaker oil level.
8.3 Inspect apparatus, alignment, grounding, and required clearances of switches.
8.4 Verify that an adequate grounding network is present for personal and equipment safety while carrying out maintenance and later when the apparatus is in operation
8.5 Prior to cleaning the apparatus, perform as-found tests, if required. These tests include:
• Verification of nameplate information,
• Checks for insulators chips, cracks and tracking
• Inspection of lightning arrestors
• Visual inspection of contacts and bus.
8.6 Clean the apparatus in the vault.
8.7 If any of these inspections reveal problems that require further extensive work, and cannot be completed during the inspection, the report is to be brought to the attention to Hydro Ottawa’s Vault Maintenance Department for a follow-up shutdown. In the case of customer owned vaults ESA permission must be given before re-energization.
8.8 Hydro Ottawa’s Asset Planning Department is responsible for work on Hydro
Ottawa owned equipment that require such things as metal clad extensions, relay replacing and/or setting, circuit breaker maintenance/replacement, HV switch maintenance/replacement, transformer maintenance/replacement, and review of vault structure changes.
8.9 The apparatus in the vaults that is owned by Hydro Ottawa are to be maintained as per Hydro Ottawa procedures, such as:
• Equipment Procedure Manual for Reyrolle Switches
• GCS0015: Thermographic Scanning of Power Lines and Distribution Apparatus
• UIS0001: Padmount/Kiosk Transformer Inspection
• UIS0002: Padmount Switchgear Inspection
8.10 Perform mechanical tests on the vault apparatus in accordance with manufacturer’s guidelines, if applicable.
8.11 Inspect insulating assemblies for evidence of physical damage or contaminated surfaces.
8.12 Perform mechanical operator tests in accordance with manufacturer’s guidelines e.g. check all switches for correct operation and alignment.
8.13 For the vault apparatus, megger and verify phase colours if applicable.
8.14 Lubricate all the moving contacts. Lubrication requirements are: a. Use appropriate lubrication on moving current-carrying parts. b. Use appropriate lubrication on moving and sliding surfaces.
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8.15 All electrical relays are to be calibrated to Hydro Ottawa settings. These tests include pick-up and dropout value tests, time current characteristics, instantaneous pick-up etc.
8.16 For oil circuit breakers, inspection of candles for damage or cracking, oil leakage and oil level will also be required.
8.17 Perform as-left tests
8.18 The customer to be informed of findings by their approved contractor and advised to arrange for repair of customer owned faulty equipment. Hydro Ottawa shall only maintain and repair its own defective equipment.
8.19 Any asbestos cable wrap is to be carried out as per Hydro Ottawa’s Health and
Safety Work Instructions HEA007.0 and applicable provincial regulations. A new and approved cable wrap to be installed once the successful removal of asbestos wrap is completed.
For Hydro Ottawa owned equipment, all records will kept as per Hydro Ottawa’s
Corporate Directive on record keeping. Regular update of Vault Maintenance Database in the GIS is required for records and tracking. The Vault Maintenance Database has all information related to ownership and maintenance/inspection records.
For customer owned facilities, the owner is strongly encouraged to keep good maintenance records and ensure the timely completion of scheduled maintenance.
Templates of various types of letters being used at Hydro Ottawa for Vault inspection and
Maintenance are included as Appendix A and B.
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 12 of 14

Date
Customer Name
Customer Address
Line 1
Line 2
City ON Postal Code
Re: Electrical High Voltage Service Room
Hydro Ottawa owns the power transformers in the above-mentioned vault however; the customer owns all remaining equipment. Cleaning and maintenance of this vault and equipment is the customer’s responsibility (please refer to Hydro Ottawa Conditions of Service). The
Manufacturer’s Specifications recommend annual maintenance and cleaning but the maximum time between the maintenance and cleaning function should not exceed (X) years. Please check your own records for when this was last done.
During a recent inspection of this vault, it was found to be dirty. The insulators and other equipment have a very heavy coating of dust. We suggest you arrange for a shutdown, and have an Utility Work Protection Code certified electrical contractor familiar with high voltage equipment clean the room and torque all electrical connections in the vault and verify the mechanical integrity of the equipment in the vault and on the main secondary disconnects.
Hydro Ottawa will isolate the high voltage side at no charge for labour during regular working hours. If a shutdown were required after hours, a quote will provided from Hydro Ottawa.
If you require any more information or discussion on this matter, please do not hesitate to contact the undersigned.
Thank you.
Sincerely,
Name
Designation
For Hydro Ottawa Use Only © 2007 VIS0001 Rev.0 Page 13 of 14

VAULT
MAINTENANCE & INSPECTION DATA SHEET
Identifier # Building Type:
Data Collection
Demarcation Point: Property line Secondary)
Street No.: Street Name:
Feed Type: Loop Radial Dual Radial
Primary Cable Size:
Sub Vaults:
Nomenclature:
Vault Location:
Access to location: [Unsafe] [Needs Clean-Up] [Hindered] [Vegetation] [Floods]
Contact Information
Company: Management Co.:
Basic Inspection
Also Feeds:
Warning Signs Satisfactory
Asbestos in feet (estimated): Asbestos: Yes No
Fire Detector
No Yes in safe working area
Door Condition:
Fencing:
Satisfactory Require Maintenance Locks:
Satisfactory Require Maintenance
Satisfactory Require Maintenance
Walls: Satisfactory Require Maintenance Floors: Satisfactory Require Maintenance
Signs of Water:
Grounding:
Yes No Sump Pit:
Satisfactory Require Maintenance Ventilation:
Yes No
Mechanical Require Maintenance
Louvers:
Lighting:
Mechanical Require Maintenance Screens:
Satisfactory Require Maintenance Fans:
Satisfactory Require Maintenance
Working Require Maintenance
Hinges: Satisfactory Require Maintenance Public Safety: Satisfactory Require Maintenance
Ceiling: Satisfactory Require Maintenance Sills: Satisfactory Require Maintenance
Electrical Equipment
Inspection Form in UIS0001: Padmount/Kiosk
Transformer Inspection completed
Inspection Form in UIS0002: Padmount Switchgear
Inspection completed
Yes No
Yes No
Comments:
Comments:
Maintenance
Maintenance Required Yes No Performed
Details: Details:
Yes No
Remarks (Use this area to expand upon deficiencies identified, or to note other deficiencies found)
Follow-up Action Needed: Yes – (High) (Medium) (Low) No Inspected by Date
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