DFA100 - Dielectric Fault Analyzer

The DFA100 Dielectric Fault Analyzer is a handheld, battery-powered instrument for monitoring non-intrusive, in-service acoustic signals produced by partial discharge and loose components. The DFA100 is designed to detect faults in grounded SF6gas-insulated systems, such as SF6-filled dead-tank circuit breakers. The DFA100 can also be applied to grounded oil-filled instrument transformers.

You can apply the DFA100 to any grounded component associated with the SF6-filled apparatus under test. During acoustic emission measurement, the DFA100 processes the results and determines the fault. The instrument can differentiate between PD, particles, and mechanical defects.

Features and Benefits

  • Condition-Based Monitoring. Use for GIS, SF6-filled dead-tank breakers, and instrument transformers, during commissioning and in service. Identify and locate PD, particles, and mechanical defects.
  • Rapid Results. The DFA100 is quick and easy to configure, producing results in seconds. Use the results by themselves or in conjunction with other in-service test results to assist decision making.
  • Selectable Settings. The DFA100 provides recommended settings for testing both SF6-filled and oil-filled equipment.
  • Simple, User-Friendly PC Interface. Use the simple interface to upload test results to a PC or download previous data and nameplate configurations.
  • Rugged and Reliable. The DFA100 has outstanding durability for field use and produces high-quality results with high repeatability, allowing for rapid and reliable decisions.
  • Battery Operated. The DFA100 is a standalone, handheld instrument that can operate up to 4 hours on one charge.
  • Wireless Synchronization. The DFA100 uses a wireless synchronization module for timing PD and mechanical activity against the power system frequency. 

The DFA100 provides three measuring modes: continuous, phase, and pulse.

  • Use Continuous mode to survey apparatus and locate the primary source of the AE signal. Continuous mode provides four scales of acoustic signal measurement: the RMS signal, peak signal, degree of modulation with fundamental, and degree of modulation with second harmonic.
  • Use Phase mode to correlate the acoustic signal and the fundamental power signal and generate an amplitude vs. phase plot. This information is used to determine the synchronizing nature of the acoustical discharges relative to the fundamental power signal. The patterns obtained are used to identify the nature of the source: PD, particles, and mechanical defects.
  • Use Pulse mode primarily to monitor particles. Particles are dynamic and produce both electrical discharges and mechanical impacts. This dynamic behavior is best represented in Pulse mode, in which DFA100 displays the results in an amplitude vs. elevation time plot. This information can be interpreted to determine number, size, and severity of the active particles.