UHF-PD Sensor Drain Valve Applications Application: UHF-Partial Discharge Measurement on Transformers » For decoupling of electromagnetic PD signals from the inner of an oilpaper insulated transformers » Sensors support "Performance/Sensitivity Check" (High frequent test pulse can be injected by further integrated electrodes) » Grounded sensors (for low frequencies) » Sensor set-up at drain valves (e.g. normally used for oil filling) » Standard design for DN 50 or DN 80 drain valves » Further designs and dimensions on request » Development in cooperation with Institute of Power Transmission and High-Voltage Technology (IEH) at the University of Stuttgart (Germany) Benefits » Easy-installable sensor » No outage needed for installation » Shielded against external noise by the transformer tank » suitable for PD monitoring (permanently installed) Specifications » Signal decoupling in ultrahigh frequency range: 200 MHz – 1 GHz » Leak-tightness tested for oil temperature 120 °C at 5 bar pressure » Sealing: Viton® (FKM) » Insulation material: PA GF 30 » Recommended load impedance: 50 Ohm » Flange: DN50/DN80 (other designs on request) » Maximum slide-in: 450 mm » Weight: approx. 3 kg (6.61 lbs) Instruments: » PD Measuring System PD-Smart-UHF or LDS-6/UHF » PD Monitoring Device PD-Guard/UHF Further accessories: Doble Lemke GmbH Zschoner Ring 9, 01723 Kesselsdorf / Dresden Germany www.doble-lemke.eu Doble Lemke AG Kaiserstrasse 9, 4310 Rheinfelden Switzerland www.doble-lemke.eu

UHF-PD Sensor Drain Valve » Carry case for easy and safe transportation » UHF Pulse generator LDC-7/UHF Additional Pictures Doble Lemke GmbH Zschoner Ring 9, 01723 Kesselsdorf / Dresden Germany www.doble-lemke.eu Doble Lemke AG Kaiserstrasse 9, 4310 Rheinfelden Switzerland www.doble-lemke.eu