Ansi neta mts 2007 frequency of maintenance tests
- 1. ANSI/NETA MTS-2007 AMERICAN NATIONAL STANDARD APPENDIX B FREQUENCY OF MAINTENANCE TESTS an excerpt from the ANSI/NETA Standard for Maintenance Testing Specifications for Electrical Power Distribution Equipment and Systems 2007 edition © 2007 InterNational Electrical Testing Association Approved by American National Standards Institute
- 2. APPENDIX B Frequency of Maintenance Tests NETA recognizes that the ideal maintenance program is reliability-based, unique to each plant and to each piece of equipment. In the absence of this information and in response to requests for a maintenance timetable, NETA’s Standards Review Council presents the following time-based maintenance schedule and matrix. One should contact a NETA Accredited Testing Company for a reliability-based evaluation. The following matrix is to be used in conjunction with Appendix B, Inspections and Tests. Application of the matrix is recognized as a guide only. Specific condition, criticality, and reliability must be determined to correctly apply the matrix. Application of the matrix, along with the culmination of historical testing data and trending, should provide a quality electrical preventive maintenance program. MAINTENANCE FREQUENCY MATRIX EQUIPMENT CONDITION POOR AVERAGE GOOD EQUIPMENT RELIABILITY REQUIREMENT LOW 1.0 2.0 2.5 MEDIUM 0.50 1.0 1.5 HIGH 0.25 0.50 0.75
- 3. APPENDIX B Frequency of Maintenance Tests (continued) Inspections and Tests Frequency in Months (Multiply These Values by the Factor in the Maintenance Frequency Matrix) Section Description Visual Visual & Mechanical Visual & Mechanical & Electrical 7.1 Switchgear & Switchboard Assemblies 12 12 24 7.2 Transformers 7.2.1.1 Small Dry-Type Transformers 2 12 36 7.2.1.2 Large Dry-Type Transformers 1 12 24 7.2.2 Liquid-Filled Transformers 1 12 24 Sampling – – 12 7.3 Cables 7.3.2 Low-Voltage Cables 2 12 36 7.3.3 Medium- and High-Voltage Cables 2 12 36 7.4 Metal-Enclosed Busways 2 12 24 Infrared Only – – 12 7.5 Switches 7.5.1.1 Low-Voltage Air Switches 2 12 36 7.5.1.2 Medium-Voltage Metal-Enclosed Switches – 12 24 7.5.1.3 Medium- and High-Voltage Open Switches 1 12 24 7.5.2 Medium-Voltage Oil Switches 1 12 24 7.5.3 Medium-Voltage Vacuum Switches 1 12 24 7.5.4 Medium-Voltage SF6 Switches 1 12 24 7.5.5 Cutouts 12 24 24 7.6 Circuit Breakers 7.6.1.1 Low-Voltage Insulated-Case/Molded-Case CB 1 12 36 7.6.1.2 Low-Voltage Power CB 1 12 36 7.6.1.3 Medium-Voltage Air CB 1 12 36 7.6.2 Medium-Voltage Oil CB 1 12 36 Sampling – – 12 7.6.2 High-Voltage Oil CB 1 12 12 Sampling – – 12 7.6.3 Medium-Voltage Vacuum CB 1 12 24 7.6.4 Extra-High-Voltage SF6 1 12 12 7.7 Circuit Switchers 1 12 12 7.8 Network Protectors 12 12 24
- 4. APPENDIX B Frequency of Maintenance Tests (continued) Inspections and Tests Frequency in Months (Multiply These Values by the Factor in the Maintenance Frequency Matrix) Section Description Visual Visual & Mechanical Visual & Mechanical & Electrical 7.9 Protective Relays 7.9.1 Electromechanical and Solid State 1 12 12 7.9.2 Microprocessor-Based 1 12 12 7.10 Instrument Transformers 12 12 36 7.11 Metering Devices 12 12 36 7.12 Regulating Apparatus 7.12.1.1 Step-Voltage Regulators 1 12 24 Sample Liquid – – 12 7.12.1.2 Induction Regulators 12 12 24 7.12.2 Current Regulators 1 12 24 7.12.3 Load Tap-changers 1 12 24 Sample Liquid – – 12 7.13 Grounding Systems 2 12 24 7.14 Ground-Fault Protection Systems 2 12 12 7.15 Rotating Machinery 7.15.1 AC Induction Motors and Generators 1 12 24 7.15.2 Synchronous Motors and Generators 1 12 24 7.15.3 DC Motors and Generators 1 12 24 7.16 Motor Control 7.16.1.1 Low-Voltage Motor Starters 2 12 24 7.16.1.2 Medium-Voltage Motor Starters 2 12 24 7.16.2.1 Low-Voltage Motor Control Centers 2 12 24 7.16.2.2 Medium-Voltage Motor Control Centers 2 12 24 7.17 Adjustable Speed Drive Systems 1 12 24 7.18 Direct-Current Systems 7.18.1 Batteries 1 12 12 7.18.2 Battery Chargers 1 12 12 7.18.3 Rectifiers 1 12 24 7.19 Surge Arresters 7.19.1 Low-Voltage Devices 2 12 24 7.19.2 Medium- and High-Voltage Devices 2 12 24
- 5. APPENDIX B Frequency of Maintenance Tests (continued) Inspections and Tests Frequency in Months (Multiply These Values by the Factor in the Maintenance Frequency Matrix) Section Description Visual Visual & Mechanical Visual & Mechanical & Electrical 7.20 Capacitors and Reactors 7.20.1 Capacitors 1 12 12 7.20.2 Capacitor Control Devices 1 12 12 7.20.3.1 Reactors, Dry-Type 2 12 24 7.20.3.2 Reactors, Liquid-Filled 1 12 24 Sampling – – 12 7.21 Outdoor Bus Structures 1 12 36 7.22 Emergency Systems 7.22.1 Engine Generator 1 2 12 Functional Testing – – 2 7.22.2 Uninterruptible Power Systems 1 12 12 Functional Testing – – 2 7.22.3 Automatic Transfer Switches 1 12 12 Functional Testing – – 2 7.23 Telemetry/Pilot Wire SCADA 1 12 12 7.24 Automatic Circuit Reclosers and Line Sectionalizers 7.24.1 Automatic Circuit Reclosers, Oil/Vacuum 1 12 24 Sample – – 12 7.24.2 Automatic Line Sectionalizers, Oil 1 12 24 Sample – – 12 7.27 EMF Testing 12 12 12