Pole Top Equipment - Transformers

COURSE DESCRIPTION

This course provides an understanding of the basic procedures used to safely remove and install pole top transformers. Although specific types of transformers are used as examples, emphasis is placed on general procedures that apply to the majority of pole top transformers.

COURSE GOALS

• Identify the most common reasons for replacing transformers.

• Demonstrate how to safely de-energize a single-phase pole mounted transformer.

• Demonstrate one method of safely rigging, removing, and replacing a single-phase pole mounted transformer.

• Demonstrate how to test for the correct voltage output from a replacement transformer.

• Demonstrate how to connect and energize a replacement transformer.

• Use a boom truck to remove and install a transformer.

• Replace a completely self-protected (CSP) transformer without disrupting service.

• Demonstrate how to replace a transformer in a three-phase bank using a portable three-phase bank.

SUBJECTS AND OBJECTIVES

Removal

• Select, inspect, and properly use appropriate safety equipment that is commonly used when replacing a transformer.

• Safely de-energize and disconnect a single-phase pole top distribution transformer.

• Dismount and remove a single-phase pole top distribution transformer, using blocks and a truck-mounted winch.

Installation

• Using blocks and a truck-mounted winch, install a single-phase pole top distribution transformer with direct pole mounts.

• Safely connect a single-phase pole top distribution transformer with the secondary bus de-energized.

• Safely energize a newly-installed pole top transformer.

• Properly test a newly-installed pole top transformer.

Phasing and Tying: Removal

• Temporarily tie in a secondary distribution bus with a nearby pole top transformer to maintain customer service.

• Safely de-energize and disconnect a completely self-protected pole top distribution transformer without disrupting customer service.

Phasing and Tying: Installation

• Demonstrate how to safely rig, dismount and mount a single-phase pole top transformer.

• Safely connect and phase-in a pole top distribution transformer to an energized three-wire single-phase secondary bus.

Three-Phase Banks: Removal

• Safely de-energize and disconnect one transformer in a three-phase bank without interrupting customer service.

• Remove a cluster-mounted pole top transformer.

Three-Phase Banks: Installation

• Install a single-phase pole top distribution transformer in a cluster-mount application.

• Safely connect, energize, and test a transformer in a three-phase bank while the secondary bus is energized.