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PD measurements on power,distribution&instrument transformers

Partial discharge measurements on power and distribution transformers are a proven tool to identify and locate insulation defects within windings, instrument transformers, bushings, tap changers, or other accessories. Besides providing the required equipment for factory acceptance testing (FAT), Power Diagnostix offers a wide range of instruments for onsite investigations and for continuous online monitoring.

Adiradh Energy offering Partial discharge measurement equipment  on transformers  using at testing laboratory (Q and R&D) and online monitoring

PD acceptance test equipment for the Transformer

Adiradh Energy offering Partial discharge measurements on transformers using ICMsystem, alternatively ICMcompact with multiplxer and ICMacoustic software, analysis panel.One of the Final insulation tests on a transformer in a factory test bay is the partial discharge acceptance test according to the IEC standard IEC60076-3 (2000). This specialized test method bases on the major PD test standard IEC60270. According to these standards the following acceptance criteria are recommended:

Oil filled power & distribution transformers:
<300pC at 130% Um
<500pC at 150% Um

Cast resin distribution type transformers & instrument transformers:
<10pC at 130% Um

The ICMsystem greatly simplifies the PD acceptance tests on large power transformers. With its true parallel PD acquisition on up to ten channels, the overall testing period is substantially shortened by features such as the automatic calibration cross coupling matrix. Furthermore, it offers real time parallel PD and RIV measurement on all channels.The ICMcompact with SPEC option is a good compromise for routine factory PD testing of distribution class transformers and instrument transformers. Its user friendly interface enables non-PD-experts to efficiently handle factory acceptance tests. The embedded 40 kHz to 10 MHz spectrum analyzer and effective noise gating features are excellent tools to cope with noisy factory environments.The ICMsystem software further offers direct transmission of acoustic time domain measurements to the ICMacoustic PD localization software, providing an accurate graphical and mathematical triangulation functionality to locate PD defects in the main tank with high precision.

Advanced Partial Discharge Detector

ICMsystem-Advanced Partial Discharge Detector

Typical Packages

1) Set for power transformer acceptance testing:

2) Set for distribution transformer acceptance testing:

3) Optional items for ICMsystem:

Online PD Monitoring system for power Transformers

Partial discharge monitoring has become increasingly important in the past few years. Besides other parameters like gas in oil analysis, temperatures, vibrations, or load conditions, etc., the PD trending information completes a full set of monitoring data of a transformer in the field. A series of standard bushing adapter (BA) is available to connect the measurement system to the test tap of condenser bushings. Even special designs are available on request. Additionally, the standard setup using the bushing test tap could be extended with UHF drain valve sensors or embedded antennas in flanges. For continuous monitoring, an instrument such as the ICMmonitor can be considered. Acoustic sensors can be used to locate a PD fault more precisely.

PD Detector

ICMmonitorr with spectrum analyzer

Combining a spectrum analyzer, an acoustic detector, and a conventional partial discharge monitor in one instrument the ICMmonitor enables PD measurements even with a large background noise e. g. on power transformers within substations or power plants.

Spectrum Analysis

Observing the frequency spectrum of a harshly disturbed PD signal allows the selection of frequency bands with fewer disturbances. Using this center frequency for a PD acquisition, gives a largely improved signal-to-noise ratio resulting in a clear pattern acquisition. The combination of spectrum analyzer and PD detector within one instrument greatly expands the measurement possibilities when analyzing the insulation systems in a noisy environment.The ICMmonitor with spectrum analysis comes with a four- or eight-channel multiplexer to directly select the input signal. The instrument provides five different display modes as well as a variety of connectivity options including TCP/IP and USB.

Typical Packages
  • 1 x ICMmonitor (incl. SPEC & gating option)
  • 1 x ICMmonitor software
  • 1 x Industrial monitoring cabinet
    (sheet metal or stainless steel)
  • 1 x Analog input card for parallel recording
    of misc. sensor signals like temperatures,
    vibrations, load conditions, etc.
  • 1 x Preamplifier RPA2
  • 1 x Preamplifier RPA1L
  • 1 x High frequency current transformer CT1
  • 1 x Impulse calibrator CAL1B
  • 1 x Set of cables
  • 1 x Set of three bushing coupling units BCU2C
  • 1 x Set of bushing adapters BAxy (BA1–BA29)
  • 1 x Mounting kit for PD decoupling units
  • 1 x Industrial PC for remote data recording

ICMmonitor software offers capturing of the data stored with the instrument as well as of screenshots of current measurements.ICMexpert is a database software for managing partial discharge (PD) patterns and extends the possibilities of Power Diagnostix programs like ICMcompact, ICMmonitor, ICMsystem, HVpilot, ICMflex, and GISmonitor. This easy-to-use tool offers functions for three main tasks occurring regularly when doing PD measurements:

Adiradh Energy offers Partial discharge (PD) measurements on power,distribution & instrument transformers in India; Hyderabad; Visakhapatnam; Vijayawada; Chennai; Puducherry; Trichy; Coimbatore; Hosur; Bangalore; Hubli; Mysore; Cochin; Kolkata; Pune; Goa; Mumbai; Thane; Kanpur; Jaipur; Nagpur; Delhi; Noida; Gurugam; Bhopal; Vadodara; Ahmedabad; Chandigarh; Chandigarh; Tata Nagar; Raipur; Rudrapur;; Durgapur; Kharagpur; Raigarh; Bhilai;Angul; Haldia; Jabalpur; Indore; Jamshedpur; Rajahmundry; Bokaro Steel City; Salem; Kochi; Rourkela; Ahmedabad ;Jamnagar; Bharuch; Sri City; Nashik; Haridwar; Mathura; Aurangabad; Bhubaneswar and other cities