Best Practice & Safety Compliance
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Cambridge, ON.
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Cable Theory

Understanding the components that make up a High Voltage underground cable is key for all those expected to terminate, splice or troubleshoot on primary cable. Voltage classes of cable will be from 15Kv up to 46Kv.

Topics Covered

Insulation Ratings
Insulation Types
Insulation Treeing
Concentric Neutrals
Tape Shielding
Floating Neutrals
Jacket Types
Silicon Injection
Cable components of a high voltage underground power cable.

 

Splicing

With the ever increasing demand on system reliability and the fact that periodically cables require to be spliced, it is essential that there is a good understanding of cable components and that a level of proficiency can be demonstrated.

Topics Covered

Review of components
Tools required
Splicing sleeves styles
Splicing sleeve compaction
Cable preparation
Use of tapes
Taped Splices
Slip-on Splices
Cold Shrink Splices
Heat Shrink Splices
Repair Slices
Cable Protection
Completing a “A COLD SHRINK SPLICE” on a 1000MCM high voltage power cable.


Terminations

Cable terminations are used in many varied applications such as padmount transformers, switchgear, overhead risers, switching cubicles and in substations to name a few. Regardless where they are used, the key is a high level of cable preparation and proper installation standards for all types of terminations.

Topics Covered

Review of components
Tools required
Termination lugs
Water sealing
Cable preparation
Taped Terminations
Slip-on Kits
Heat Shrink Kits
Cold Shrink Kits
Lightning Arresters
Elbows (200 amp & 600 amp)

A Milton Hydro Employee completing terminations at a 3 phase overhead “RISER POLE”

An example of expert workmanship of terminating cables in a breaker cell.

 

 

Transformers

Transformers covered in this section deal primarily with single phase and three phase installations with the primary focus on being competent with different styles of transformers, fuse protection, installation practices, internal switches and tap changers. Preferable this program is done as a Hands On session either as a new installation or as a replacement job.

Topics Covered

Three Phase and Single Phase
Live Front Style
Elbow Connected
Ground Grids
Installation Standards
Secondary Bus Bars
Cable Identification
Arrester Protection
Internal Switches
Tap Changers
Dual Wound Transformers

Preparing to perform a potential test at the capacitive test point on a load break elbow.  This transformer has 3 internal switches for providing worker safety during switching operations.

A completed padmount transformer after a rehab project.  This transformer is the “OPEN POINT” in the loop and has lightning arrestor protection.

 

Switchgear

As electrical systems become more complex, so does the equipment. Switchgear is an essential part of allowing system flexibility for load transfers, maintaining open points in circuits and allowing switching operations to be done at ground level. The program is intended to allow a thorough understanding of how the switchgear functions including the common bus configuration, fuse protection and gang operated switches. As some switchgear relies on SF6 and or vacuum switches, both topics are included in the overview.

Topics Covered

Various Configurations
Live Front Switchgear
Elbow Connected
Fuse Operation
Gang Operated Switches
Fibre Board Maintenance and Tracking

A An above ground 4 way S&C 27.6Kv Vista switchgear. _One of the S&C 27.6Kv PME units in Orangeville Hydro's system.

An S&C 27.6Kv PMH unit.

 

Potential Indicating Devices

Potential indicating devices are used on a daily basis for potential testing, to check phasing and during trouble shooting operations. The focus of this session is to discuss
the theory of operation and make certain the appropriate piece of equipment is being used for the application at hand.

Topics Covered

Full Line Potential Indicators
Capacitive Test Point Indicators
Phasing Sticks
High Pot Adapter Units (Primary Cable Faults)
Meter Base Testers
Electric Fields
Theory of Operation

Working with a HI-POT adapter unit to perform testing procedures on underground primary cable.  The meter is showing a good section of cable.

Using a Hastings Phasing Sticks with a HIPOT ADAPTER during a training session. The meter is reading 3.1 Kv DC, which is approximately 60% of the 4800 volts AC.__Using a Hastings Phasing Sticks with a HIPOT ADAPTER during a training session. The meter reading zero is indicating a good section of UG cable.

 

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