Power System Maintenance Evaluation

MPS has a program to evaluate and maintain the integrity of the power system from top to bottom, a head to toe approach. The program areas include the following:

Delivery Point Substations – Where power is received from TVA:

• Maintenance and testing of transformers, breakers and battery systems
• TVA loss control and verification
• Oil testing of major transformers

69kV Transmission System:

• Pole and line inspection every five years
• Vegetation management to assure right of ways are cleared every three years

Distribution Substations:

• Maintenance of transformers and load tap changers
• Oil testing of transformers
• Maintenance and testing of breakers and battery systems
• Testing of TVA revenue meters
• Semi-annual infrared testing of switches, arrestors and transformers

Primary Distribution (13.2kV) System:

• Recloser and capacitor inspection every three hours
• Pole base survey & treatment (ten year cycle)
• Overhead primary line inspections (ten year cycle)
• Operations testing of 3-phase disconnect switches (five year cycle)
• Semi-annual infrared testing of switches, capacitors, arrester, underground transitions and transformers
• Vegetation Management to assure Right of Ways are cleared every three years

Customer Meters:

• Residential meters – test every ten years
• Demand meters – test every five years
• Primary meter installations (larger customers) – test every three years