Transformer Troubleshooting

Introduction to Transformer Troubleshooting Describe different types of transformer connections. Describe the basic differences between completely self-protected (CSP) transformers and conventional transformers. Protective Devices Describe some overcurrent protective devices that are used with transformers. Describe some overvoltage protective devices that are used with transformers. Transformer Problems Describe typical causes of transformer outages. Describe general considerations involved in responding to a trouble call. Describe potential sources of back feed. Isolating and Testing Single-Phase Transformers Part 1 Describe how to isolate and test a typical wye-connected conventional transformer. Describe special considerations associated with isolating and testing a delta-connected conventional transformer. Isolating and Testing Single-Phase Transformers Part 2 Describe how to isolate a typical CSP transformer. Describe how to test a typical CSP transformer. Troubleshooting Three-Phase Banks Identify ways that single-phase transformers can be banked together. Define the following terms: poletop arcing and sympathetic tripping. Describe how to isolate and test a typical three-phase transformer bank. Temporary Service Restoration Describe one way that temporary service can be restored in a single-phase application Describe one way that temporary service can be restored in a three-phase application.