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Partial Discharge Detector Model: PDC 13
Akil Electronics Systems
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HV Insulation
void
Partial Discharges are localized discharges in insulating media, which partially bridge the insulation between conductors. Though the discharges involve small amount of energy, they lead to deterioration of the dielectric properties of insulating material. Partial discharge activity in test object is unobservable with normal high voltage tests and requires specific PD measurement arrangement to diagnose. The PD activity manifest as very short electric pulses and these are detected using external circuit connected to the test object. The PD measurement system provides magnitude of the discharges enabling you to determine whether the discharge activity is within permissible limits.
pd
GND
Model PDC 13 Partial Discharge Detector is designed to measure partial discharges during routine and type testing of
• • • • •
Power Cables CT / PT Capacitors Lightning Arresters Insulating Material
• • • • •
Transformers Bushings Switchgears Insulators GIS
The PDC 13 Partial Discharge Detector is a PC based test instrument developed upon the strong foundation of reliable AES Partial Discharge Detectors, extending their functionality with added features like storage of waveform, easy and fast calibration, signal windowing, filters and other advanced analysis options.
Akil Electronics Systems | Partial Discharge Measurement – PDC 13
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SPECIFICATIONS Sensitivity 1 pC when connected to a load capacitance of 1 nF, through 1nF coupling capacitor in a noise free laboratory, which is properly installed with filters
Measuring Bandwidth Wide band 5-1000 kHz, optional bandwidths as per customer requirements are available. Further, user can set the bandwidth using inbuilt digital filters according to IEC. Filter topology can be Low Pass, Band Pass & High Pass with adjustable Cut-Off frequencies
Display The measured apparent charge is displayed in Pico coulombs on the computer screen. Hence it is easy for the operator to conduct go /no go tests.
The discharge pulses are displayed on the computer screen with an option of having elliptical time base or viewing the discharge pulses superimposed over a sinusoid for easier recognition of the symmetry, phase and polarity characteristics of the discharge pattern.
The discharge trend over a period of time can be visualised with help of the histogram (discharge intensity) plot or the 3D (phi-q-n) plot options.
Akil Electronics Systems | Partial Discharge Measurement – PDC 13
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Measurement method The detector measures partial discharge signals in ‘straight forward method’ (balanced mode available as option).
Calibrator • Portable, external & battery-operated • Output adjustable from 5 to 400 pC • Outputs up to 50000pC available • Accuracy ±1% The calibrator is required to perform calibration of the complete PD test set up each time a test object is connected.
Easy Calibration Calibration performed by entering the magnitude of calibration pulse injected. The gain of the system gets automatically adjusted based on this.
Electronic window Single, two or multiple windows having adjustable width and position. This helps to blank the unwanted noise and view only segments of interest during testing.
Data Recording User can save a snapshot of the discharge pattern as an image file for report generation and sharing. The PD software can also record the entire discharge data of a test session to the
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disk. This can be useful for documentation, further analysis and collaboration. The recorded data file can be opened with the playback software, Recordings Viewer.
General • • • • •
Power Supply: 230vac, 50Hz. Operating temperature: 10°C to 35°C Relative humidity: 95% non-condensing Size: 19” width, 3U height, 300mm depth, approx.* Weight: 5 kg approx.* *excluding the dimensions and weight of the Computer
Standard Supply includes • • • • • •
PD Detector Measuring Impedance/Input Unit External calibrator Computer PD measurement software Signal cables
Optional equipment • • • • • • •
HV coupling capacitor Digital KV meter Balanced Mode testing Multi-channel measurement (up to 4ch) PD free HV transformer PDSL for power cables EMI Filters
Other products from Akil Electronics Systems include PD free HV transformers, coupling capacitors, voltage regulators, Isolation transformer and filters designed for PD testing. We can provide complete PD testing solutions.
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Typical Partial Discharge test setup
OPTIONS Digital Kilo Volt Meter Indicates the test voltage measured through a high voltage PD free coupling capacitor. Can indicate values in Peak, Peak/√2 & RMS (customer to specify exact requirement). It also enables additional display of test kV in the PC software.
PD free High voltage Coupling capacitor Blocks 50Hz high voltage and allows only the partial discharge pulses to be measured. The HV is also measured through this capacitor.
Three Phase Input Unit Available for the testing of power transformers. Connected to the respective condenser bushings (Or Coupling Capacitors), PD value of each phase can be measured simultaneously.
High Voltage Coupling Capacitor with PD free HV Transformer of 100KV
Feature overview Feature Window Gating
Comments The user can select the phase angles over which the Measurement software will ignore any discharge events. Gating can be applied to one location (e.g. 175 ° — 185 °), symmetrically to two locations 180 ° apart (e.g. 175 ° — 185 ° and 355 ° — 5 °) or to multiple locations. The software displays the total phase angle over which gating is applied enabling user to check for standards compliance at a glance.
Akil Electronics Systems | Partial Discharge Measurement – PDC 13
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Noise Threshold
Pulse Resolution
Acquire/Replay
Individual Pulses
Software indicates Apparent Discharge magnitude calculated according to the IEC standards. Discharge pulses vs phase, discharge intensity and phiq-n plot are provided in the measurement user interface. The user can specify base/background noise threshold level in the user interface. Any discharge events with magnitude below this threshold is ignored. The measurement software has a pulse resolution time of 10 µs when identifying discharge events. This equates to resolution of up to 2000 discharge events per cycle of 50 Hz AC. The complete digitized PD signal (waveform) is stored to disk for playback and analysis. User can generate discharge intensity plots as well as phi-q-n plot for any specific part of the recorded data. These data can be exported for analysis in external software packages such as MATLAB from the same playback user interface. User interface is not available for viewing individual discharge pulses. But this data is present in the data recording as the entire PD signal is recorded to disk and there is option to export this data as a csv file.
Note: Appearance of the equipment and specifications may vary due to continuous improvement
www.akilelectronics.com
+91 98259 53155
[email protected]
+91 63544 17185
Plot No. 12-14, Horizon Industrial Park, Bamangam, Por - 391243, Vadodara, Gujarat, India
Akil Electronics Systems | Partial Discharge Measurement – PDC 13
