Compact, reliable and EMC hardened design The Graphical User Interface of the instrument is highly intuitive, focussed on convenience with built-in useful programs (e.g. support tool for tuning the external high-voltage supply) and uses a large colour touch screen as the input device. Advanced, well-engineered test equipment, optimised to the specific application The instrument works on the principle of a combined bridge-vector-meter and is capable of analyzing capacitive and inductive loads with high accuracy and stability. Additional signal analysis capabilities like Spectrum Analyser, Digital Scope and Data Logger are integrated The Dielectric-Loss Analyzing System 2820a is designed for measurement of low dielectric losses and impedances (Dissipation Factor and Power Factor) of high-voltage apparatus (e.g. the insulation of bushings). Integrated solution with built-in industrial computer Easy to operate with Manual and Automated test modes, Software assisted test preparation, Execution and Trend analysis. Complete Measuring System including power supplies, standard capacitors, current comparators, test cells, application support and calibration from one supplier. Wide Application Range. Losses of all types of insulation including shunt reactors under unstable power frequency can be measured. Upgrade. Outdated Tettex bridge models (e.g. 2877, 2801, 2821, etc.) can be easily replaced, with existing cable sets. The operator can choose between manual or automatic modes. While the manual mode provides quick measurements, the automatic test mode supports complete automated test sequences. Advanced software functionalities such as insulation temperature correction, programmable test sequences with pass/fail limits, graphical visualisation of measured data, etc. make this instrument a powerful tool for analysis of highvoltage equipment. The built-in industrial computer with standard interfaces (e.g. USB) enables easy exchange of measurement results, related settings, etc. for further analysis or reporting. Power Transformers Distribution Transformers Instrument Transformers Liquid or Solid Insulations Surge Arrestors Rotating Machines a brand of Haefely is a subsidiary of Hubbell Incorporated. Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

EASY OPERATION ANALYSIS FUNCTION With its self-explanatory graphical user interface this equipment is designed for simple operation. Test planning, preparation, execution and first assessment can be handled with just a fingertip. Additionally the touch-screen seals the equipment against environmental influences. If desired a USB keyboard and mouse can also be connected. The graphical display of measured data makes this instrument a powerful tool for analysis of high-voltage equipment. The analysis function can be used as follows: Comparison against limits (Pass/fail level) Trending Analysis (comparison...

TECHNICAL SPECIFICATIONS Range Dissipation Factor (tan ) Power Factor (cos ) Test Voltage Test Current @ Input Cn Test Current @ Input Cx Test Frequency Recorded Values Measuring Time DF (tan), DF (tan)@20°C , DF (tan) [%], DF (tan) [%]@20°C , PF (cos), PF (cos)@20°C , PF (cos) [%], PF (cos) [%] @20°C , QF (quality factor), QF (quality factor)@20°C , CP (ZX= CP RP), RP (ZX= CP RP), CS (ZX= CS + RS), RS (ZX= CS + RS), LS (ZX= LS + RS), RS (ZX= LS + RS), LP (ZX= LP RP), RP (ZX= LP RP), Cn (Standard Capacitor Value), URMS, U/ 3, Ix RMS, In RMS, Im, Ife, Impedance Zx, Phase-angle (Zx), Admittance...

C, L & tan Measuring Bridge 2820a Instrument Mains cable (country specific) Operating Instructions and Test Certificate For the connection cables please select desired type and length in “Accessories and Options” ACCESSORIES AND OPTIONS Order code Office Software package. Used for PC test preparation, data visualisation, staff education Field kit including: Rugged field cases for instrument, Rugged field cases for cables Complete connection cable kit for large DUT (e.g. power transformer) connection, including: Earthing cable with gripper, V-point connection cable (black), 1 measuring cable (blue)...