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National Electric Energy Testing, Research & Applications Center

RIV / Corona . . . . . Insulator Evaluation. . . . . Arrester Evaluation . . . . . Cutout Evaluation. . . . . Impulse Testing. . . . . HV Cable System Qualification


NEETRAC maintains indoor and outdoor high voltage testing capabilities for a majority of your high voltage testing requirements.

Equipment includes:

  • 700 kV series resonant test set indoors
  • 350 kV series resonant test set indoors
  • 1,050 kV cascade test set outdoors
  • 2.2 MV, 220 kJ indoor impulse generator
  • 600 kV indoor impulse generator
  • 1,000 kV dc indoor or outdoor test set

Capabilities include:

  • Wet and dry arc withstand & flashover
  • Radio influence voltage (RIV)
  • Partial discharge
  • AC/DC watts loss
  • Visual corona
  • Capacitance and dissipaton factor
  • Device frequency characterization
  • Lightning, switching and chop wave impulse
  • Bare-hand bucket truck qualification (up to 500 kV)

Both standard and customized test programs can be conducted on all types of T&D System Components.


NEETRAC can evaluate new designs or insulators removed from service. Typical tests include:

  • Impulse withstand or flashover
  • AC wet and dry withstand or flashover
  • Watts loss
  • RIV
  • Tracking wheel (distribution class)
  • AC puncture
  • Steep front impulse

NEETRAC can conduct insulator tests according to a variety of industry test procedures, including ANSI C29, IEC 60383 and IEC 60575.


Lightning arrester life expectancy is an important issue for manufacturers and electric utilities. NEETRAC can perform standardized and custom diagnostic tests of distribution and secondary arresters to evaluate their condition or their performance characteristics. IEEE C62 and NEETRAC Guidelines for Testing Meter-Base Surge Arresters are example testing protocols. Multipulse surge testing and surge tests are also available.

Meter base arrester failure end of life
Failed block in MOV arrester


When there are questions about corona on overhead line or substation components, NEETRAC has the ability to simulate the construction and make an evaluation.

Visual corona detected using image intensifier

Visual corona tests can be made using light amplification (70,000 X image intensifier) and recorded digitally. RIV measurements can be made per NEMA 107 and IEC 61284. Testing can be performed on overhead hardware for system voltages of up to 500 kV.


HI-VARC. Research has determined that electrical heating is a major symptom of insulation material failure. In response, NEETRAC developed the high voltage ac resistive current (HI-VARC) measurement technique. This technique allows NEETRAC to measure resistive currents which can be used to assess the degradation of insulating devices.

Transformer Transfer Function Testing. The transfer function is used at NEETRAC to verify the winding integrity after a 60 Hz short-circuit. Transfer functions are calculated before and after the short-circuit, then compared to see if changes have occurred in the transformer.

Frequency Response Analysis (FRA). FRA field testing of power transformers can detect winding deformation on high side or low side windings. No historical test data are required. Winding distortion is rated objectively with patent pending technology.


We regularly perform qualification tests on HV Extruded Underground Cable and Cable System components. Tests are conducted according to AEIC CS9, IEC 60840, IEC 62067, IEEE 48 and IEEE 404. Systems up through 400 kV can be tested. Test reports provide independent certification that all test procedures are performed according to appropriate requirements.

138 kV cable qualification test

Last revised on February 24, 2021