Soken DAC-PD-9 - Digital Partial Discharge Analyzer

Electrical equipment such as power transmission and distribution equipment critical for social infrastructures and factories that operate 24 hours a day is demanded of high reliability even when used under severe conditions. Recent years have seen attempts to diagnose the accurate remaining lifespan during periodic inspections, and realize the use of such equipment beyond the design life-cycle through the implementation of appropriate maintenance. In addition, equipment diagnostic techniques as a means of preventive maintenance have also become essential to prevent the sudden breakdown of electrical equipment. To meet the expectations for these electrical equipment diagnoses, Soken Electric Co., Ltd. has developed Digital Partial Discharge Analyzer DAC-PD-9 that incorporates the very latest digital technology.

Covering widely required tests by IEC standards, DAC-PD-9 is an analyzer with a wide-band amplifier. The set incorporates the same conventional testing functions as low-frequency (narrowband), wide-band, and tuned measuring instruments do. Moreover, it is also capable of ultra wide-band measurements (up to 40 MHz). DAC-PD-9 allows a selection of optimum frequency bands suitable for any type of test specimens to enable quantitative and reproducible partial discharge measurements. In addition, the set can sample in time-series all data to enable statistical and quantitative measurements.

Test Specimens

• HV Transformers
• Power Cables
• Generators
• Motors
• Coils Capacitors
• Bushings
• Circuit Breakers
• Switches

Variable Measuring Frequency

The evaluation of partial discharge largely depends on the selection of frequency bands. Taking into account the propagation characteristics and electrical structure of the test specimen, and paying attention to the noise environment and data reproducibility, the optimal frequency band should be selected

• Frequency Band：
  • Low Band ：20kHz - 400kHz ：
  • MID Band ：400kHz - 4MHz ：
  • HIGH Band ：4MHz - 40MHz
• Center Frequency ：40kHz - 40MHz
• Frequency Band Range:
  • LOW Band ：30kHz,50kHz,100kHz,300kHz
  • MID Band ：300kHz,500kHz,1MHz,3MHz
  • HIGH Band ：300kHz,500kHz,1MHz,3MHz 

Numerical Evaluation of Partial Discharges by a digital sampling

• Average discharge current I
  The average discharge current is expressed in coulombs per second(C/s) or in amperes(A).
  
• Discharge power P
  Where an ui is the instantaneous value of the test voltage at the instant occurrence of the individual apparent charges magnitude as qi. The discharge power is expressed in watts (W) and becomes the cause of the electric power loss of the sample.
  
• Quadratic rate D
  The quadratic rate is expressed in (coulombs)2 per second (C2/s), and the partial discharge magnitudes will be accentuated and displayed. 
  

• Digital technology enables the determination of the true polarity of partial discharges.
• All parameters such as cumulative frequency and net peak are displayed in real-time.
• Discharge pulses of positive and negative electrodes can be counted simultaneously.
• Center frequencies and frequency bandwidths can be freely selected for measurement.
• The large-capacity memory enables long-term data storage.

Partial Discharge Measuring Unit

Voltage Detection(Torigger source)

Interface/Power Source

Partial Discharge Analyzing Software

Do you have a Digital Partial Discharge Analyzer that needs to be calibrated?

We offer standard traceable calibration and ISO 17025 accredited calibration services.