ANSI/NETA MTS

Standard for Maintenance Testing Specifications for
Electrical Power Equipment and Systems - 2019 Edition

The ANSI/NETA Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems

Scope
The purpose of these specifications is to assure tested electrical equipment and systems are operational, are within applicable standards and manufacturer's tolerances, and are suitable for continued service. These specifications incorporate comprehensive field tests and inspections to assess the suitability for continued service, condition of maintenance, and reliability of electrical power distribution equipment and systems.

Equipment Addressed

SwitchgearCircuit BreakersBatteries
TransformersProtective RelaysCapacitors and reactors
CablesRotating machineryProtective Reays
SwitchesMotorsInstrument Transformers


 


Revisions Include

2019

  • Online Partial Discharge Survey for Switchgear
  • Frequency of Power Systems Studies
  • Frequency of Maintenance Matrix
  • New Table 100.4.5 Suggested Limits for Continued Use of In-Service Natural Ester Liquids
  • New Table 100.6.4 DAC Test Voltage Levels (20 Hz to 500 Hz) as Used for Maintenance Testing (50 DAC excitations) of Repaired/Refurbished Power Cables
  • New Tables 100.23 Online Partial Discharge Survey for Switchgear

 

2015

  • New numbering system for more accurate referencing
  • Protective Relays
  • Instrument Transformers
  • Rotating Machinery
  • New Table 100.11 Insulation Resistance Test Values for Rotating Machinery for One Minute at 40deg C
  • Revised Table 100.1 Insulation Resistance Test Values, Electrical Apparatus and Systems Other Than Rotating Machinery
  • Updated references to industry standards

The ANSI/NETA MTS Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems, 2019 edition, was approved as an American National Standard on February 4, 2019 and supersedes the ANSI/NETA MTS-2015. NETA recommends always referencing the most current edition of the ANSI/NETA standards whenever possible to assure that bid documents, specifications, and reports are as accurate and complete as possible.

The ANSI/NETA MTS Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems is a document that is used worldwide by individuals seeking to assure that the electrical power equipment and systems in their care operate reliably and safely in conformance with industry and manufacturer standards and tolerances.

Maintenance tests are those tests that allow the determination of whether or not the electrical equipment is suitable for safe and continued service.

When dealing with service-aged equipment, many criteria are used in determining what equipment is to be tested, at what intervals, and to what extent. Ambient conditions, availability of down time, and maintenance budgets are but a few of the considerations that go into the planning of a maintenance schedule. The owner must make many decisions each time maintenance is considered. It is the intent of the ANSI/NETA Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems to list a majority of the field tests available for assessing the suitability for continued service and reliability of the power distribution system.

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