HIGH VOLTAGE TESTING AND MEASURING TECHNOLOGY :HIGH VOLTAGE TESTING AND MEASURING TECHNOLOGY © 2000 by LEMKE DIAGNOSTICS GmbH, Germany


Slide 2:LEMKE DIAGNOSTICS GmbH proudly presents the latest developments in • Partial Discharge Measuring Technology • Capacitance and Loss Factor Measuring Technology • Complete High Voltage Test Systems • Performances of our DKD Calibration Laboratory


Slide 3:Some examples of high sophisticated measuring systems


Slide 4:Partial Discharge Technology The Partial Discharge Measuring Systems of LEMKE DIAGNOSTICS GmbH are suitable for measurements of high voltage equipment, such as: • Motors and generators • Transformers and converters • Medium and High Voltage Cables • Cable accessories • Arresters • Switchgears • Capacitors


Slide 5:Partial Discharge Technology Complete Partial Discharge Measuring System LDS-6 with Measuring Impedance, Multiplexer and Calibrator


Slide 6:Partial Discharge Technology The Digital Partial Discharge Measuring System LDS-6 has the following main features: • Useable with standard PD measuring circuit according to IEC270 • Using advanced digital signal processing hardware • Different processing units (PU) available, like wide band PU linear and logarithmic, narrow band PU • Noise gating unit for sensor-controlled rejection of external noise pulses • Windowing unit for rejection of phase-related noise pulses


Slide 7:Partial Discharge Technology


Slide 8:Partial Discharge Technology A lot of computer-based evaluation functions are available.


Slide 9:Partial Discharge Technology A lot of statistic and diagnosis tools are available.


Slide 10:Partial Discharge Technology Optional extension by: • PD Fault Location • Control panels • Customer specific templates


Slide 11:Partial Discharge Technology Differential LEMKE PROBE LDP-5 for on-site and laboratory PD diagnosis tests Using of capacitive or inductive field coupling mode LDP-5


Slide 12:Partial Discharge Technology Ultrasonic PD Sensor for detection of partial discharges by using acoustic emission UHF/VHF-Converter for on-site PD detection on power cable accessories under life condition (can be adopted to the LDP-5) Location of external and internal PD sources by different ultrasonic receivers


Slide 13:Partial Discharge Technology PD detectors for standardized measurements acc. to IEC270 for quality tests on HV equipment and fundamental PD studies in research and education PD Noise Impulse Comparator for elimination of pulse shaped noise signals


Slide 14:Partial Discharge Technology Additional accessories for PD measuring circuits, like • Measuring Impedance • Bridge Impedance • Noise Reduction Filter • Multiplexer


Slide 15:Partial Discharge Technology Calibrators for calibrating of PD measuring circuits, like • Calibrator • Charge Injector • Reference Calibrator and Pulse Integrator


Slide 16:Partial Discharge Technology On-line calibrating system for calibrating of PD measuring circuits under test voltage


Slide 17:Partial Discharge Technology Computer-aided PD measuring system for measuring, recording and analysis of PD pulses


Slide 18:Partial Discharge Technology PD Warning Device LDWD-6 for Continuous PD Monitoring of High Voltage Systems


Slide 19:Partial Discharge Technology PD Warning Device LDWD-6 for high sensitive monitoring of PD faults in three-phase high voltage power apparatus • outdoor-useable measuring equipment • built-in multiplexing unit for phase selection • built-in gating unit for noise suppression • extensive alarm functions • computer-aided monitoring and evaluation unit with user-friendly high-sophisticated software • remote controllable


Slide 20:Partial Discharge Technology Directional Coupler Measuring System LDY-724 (DCD) for high sensitive location of PD faults in high and extra high voltage cable accessories (joints, terminations)


Slide 21:Partial Discharge Technology • Signal decoupling by Directional Coupler Sensors • Sensors remain in the cable accessory • Permanent or sequential PD monitoring possible • For after laying and installation tests, also on-site • For type-, acceptance- and development tests of prefabricated cable accessories and components


Slide 22:Partial Discharge Technology Power Cable Test System CDA-50


Slide 23:Partial Discharge Technology • Non-destructive cable assessment The Power Cable Test System CDA-50 is designed for • PD fault location • PD fault exposure • Service life prediction The system bases on the characteristic CDA test voltage.


Slide 24:Partial Discharge Technology • Low voltage stress Benefits of CDA testing: • Short test duration • Low power demand • Low weight • Location of PD faults • Cost-benefit test procedure


Slide 25:Partial Discharge Technology High voltage module for CDA testing of medium voltage power cables, equipped in a van


Slide 26:Partial Discharge Technology Completely computer-aided controlling, measuring & evaluation


Slide 27:Partial Discharge Technology This is the result of the CDA testing: The PD Fault Position Map


Slide 28:Capacitance and Loss Factor Measuring Technology


Slide 29:Capacitance and Loss Factor Measuring Technology • Dissipation factor (tan d) The DSP-based Dissipation Factor and Capacitance Measuring System LDV-5 is suitable for high precision measurements of: • Capacitance CX • Test voltage • Frequency • Test specimen currents • Power factor • many other parameter


Slide 30:Capacitance and Loss Factor Measuring Technology • Using advanced digital signal processing (DSP) hardware Main features of the LDV-5 are: • Using potential-free measuring sensors • Using fully automatic measuring procedure in the frequency range between 10 and 400 Hz • Using integrated PC for data storage and file transfer • Individual setup possibilities


Slide 31:Capacitance and Loss Factor Measuring Technology


Slide 32:Capacitance and Loss Factor Measuring Technology Protocol sheet like an EXCEL® spreadsheet


Slide 33:Capacitance and Loss Factor Measuring Technology Different evaluation procedures help to get the best information about the state of the tested insulation.


Slide 34:Capacitance and Loss Factor Measuring Technology Customer specific evaluation templates, based on EXCEL® spreadsheets with general parameter, tables, diagrams, logos and comments


Slide 35:Capacitance and Loss Factor Measuring Technology • Dissipation factor (tan d) The Dielectric Analyzer DIANA is suitable for laboratory measurements of: • Capacitance CX • Occurrence of partial discharges


Slide 36:Capacitance and Loss Factor Measuring Technology The test cells can be used together with DSP-based Dissipation Factor and Capacitance Measuring System LDV-5 or Dielectric Analyzer DIANA for measurements of liquid and solid dielectric materials.


Slide 37:Complete High Voltage Test Systems Customer specific test systems for different applications, like • surge arresters • switchgears


Slide 38:Complete High Voltage Test Systems Automatic HV and PD measuring systems for testing of bushings for SF6 switchgears


Slide 39:Performances of our DKD Calibration Laboratory LEMKE DIAGNOSTICS GmbH is certificated as an official DKD Calibration Laboratory by the Physikalisch-Technische Bundesanstalt (PTB). We are able to calibrate in the ranges of: • Impulse charges • PD measuring technique • Time parameter


Slide 40:Performances of our DKD Calibration Laboratory Reference calibration unit


Slide 41:Our company LEMKE DIAGNOSTICS GmbH Radeburger Str. 47 01468 Volkersdorf / Dresden Germany


MANY THANKS FOR YOUR ATTENTION ! :MANY THANKS FOR YOUR ATTENTION ! © 2000 by LEMKE DIAGNOSTICS GmbH, Germany