PD-Smart electrical

Following application fields are possible:

• Lab measurements on any type of insulating material and HV components during Research & Development (R&D) as well as for sciences measurements

• Quality testing in regard to PD on HV apparatus and accessories during or after assembling/manufacturing
  
• Partial Discharge testing and analysis whilst installation or commissioning of HV apparatus
  
• Partial Discharge Measurementsduring the complete service life of the equipment (while in operation or during maintenance/revision)

• Highest measurement accuracy and sample rate due to complete digital system. Furthermore the PD charge evaluation with the PD-Smart is fully compatible with IEC 60270, VDE 0434 and ANSI.

• Advanced noise suppression tools. Nothing is more problematic than the intereferences caused by on-site noise. The PD-Smart has a variety of noise suppression techniques:
  • Noise Gating via integrated hardware gating channel
  • PD Windowing with unlimited number of windows for an easy suppression of phase-locked noise signals
  • Freely adjustable frequency and filter

• Synchronous measurement. The system can be easily extended for truly synchronous multi-channel measurements. The Star-Diagram helps to differentiate various PD sources and noise from each other. While measuring three phases simultaneously, the combined results are displayed in the Star-Diagram.

• Smart User Interface. The new smart user interface represents over 40 years of Lemke's knowledge in design of measurement equipement. Each user can now customize the layout of the dashboard to his personal needs. PD testing will therefore be easier, faster and a great experience.

• Well-known and advanced Lemke Noise Gating Technology. The PD-Smart provides one separate channel for real hardware gating. The elimination of external noises happens via a separate antenna (gating sensor L110). These features are already included in the standard PD-Smart delivery volume. No other units are needed and thus no extra charge will apply.

• Ruggedized and easily transportable. The PD-Smart is self-contained in a rugged polyurethane case and is especially designed for the day-to-day field use. The PD-Smart comes with an ABS Peli Suitcase, which makes the transport to different locations easy and uncomplicated.

• Superior safety in high voltage test set ups due to complete galvanic isolation between the PD-Smart and Laptop via fibre-optical cabling. This allows also a remarkable reduce of the background noise level.

Main electrical parameter - in general:

• permanent detection of all PD events

• Evaluation and interpretation of the Partial Discharges according to IEC 60270, VDE 0434 and ANSI

• Digital, numerical real-time integration of the PD events

• Minimum detectable apparent charge: < 0.1 pC

• Measurement interval: unlimited

• Single Pulse detection: < 4 ns

• Max. double pulse resolution: <32 ns (time range, super positionerror < 1 %)

• Integration in time and frequency range:
  • Time range: 140 ns ... 8 us
  • Frequency range: 35 kHz ... 20 MHz
  • Filter bandwidths free adjustable

• Max. pulse frequency: > 2.1 MPulses / sec

• Synchronization between units: < 800 ps

• Voltage supply: 8.4 V DC with battery or external power supply
  (100 - 240 V, 50 - 60 Hz)

• Outputs:
  • 1 x FOL-Output with E/O converter as Ethernet
  • 1 x FOL-Output Downlink
  • 1 x FOL-Output Uplink
  • 1 x TNC Trigger output
  • 1 x FOL Trigger output

• Inputs:
  • 2 x TNC (HF PD-Signal "PD"and LF-voltage signal"TV")
  • 1 x TNC HF Gating Signal

Main electrical parameter-Input "PD-Partial Discharge"

• Input impedance: 50 Ohm
• Input frequency range: DC to 20 MHz
• Dynamic range: 16 bit, 100 dB
• Max. Input voltage: 70 V rms
• Input protection against over-voltage and short-circuit

Main electrical parameter-Input "TV - Test Voltage"

• Input impedance: 1 MOhm
• Input frequency range:15Hz to 10 kHz
• Dynamic range: 16 bit, 80 dB
• Max. Input voltage: 50 V rms

Environmental conditions:

• Temperature range:
  • 0° C to 40° C (operation)
  • -10° C to 60° C (storage)
• Humidity:
  • 5 % - 95%, non-condensing

For all applications:

• UHF-Unit for non-conventional PD measurements
• LDC-5 - Calibrator(5, 20, 100, 500 pC)
• LDM-5 or LDM-5/U-Measuring Impedance with voltage output 50 V, type BNC
• LDB-5 - Bridge impedance
• Notebook

For measurements on Rotating Machines:

• PDDC-24 PD Coupler (with integrated measuring impedance and HV fuse) for decoupling PD pulses
• PDDC-17 PD Coupler (with integrated measuring impedance) for decoupling PD pulses
• LDJ-5- Charge Injectorwith higherpulse charges up to 10,000 pC

For measurements on Transformers:

• LDM-6/U: bushing tap adapter, PD measuring impedance with voltage decoupling for power transformer bushings
• LDM-5/U5: Measuring impedance with additional 2 switches for 4 Cu's

For measurements on Cables:

• HFCT-Sensors (Rogowski-Coils)
• Software Add-on:PD Fault Location ("PD Mapping")via Reflectometer Method

•  download data-sheet