Automatic Dielectric Constant Tan Delta & Resistivity Test Set

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F E A T U R E SnnnnnnnnnnnnnFully automatic testing sequence controlled by amicro processor.Optional manual test sequencing.Automatic and continuous calibration ofResistance measuring circuit against two internalresistance standards.Automatic and continuous calibration of the C & DFmeasurement against internal reference capacitor.Internal AC voltage source of line frequency andsinusoidal wave shape.Internal DC voltage sources for (+) and (-) voltages.Windows software for interfacing to a PCRS232 Computer interface for downloading dataor control from a PC.Centronics parallel printer interface for direct testdata printout.Menu driven software operation.Stores up to 100 test results.Measures Resistivity applying (+) or (-) voltage.Open GND and Interlock protection for safety ofInstrument as well as the operator.BENEFITSn Eliminates manual balancing & reduces operator error.n Reduces the time required for each test sample.n Provides a high degree of repeatability.n Provides a printout, storage or export of test data.DESCRIPTIONThe Eltel Model ADTR-2K is a versatile Test Set usedfor measuring the Dielectric Constant, Tan Delta (DF),Resistivity of transformer oils & other electrical insulatingliquids or solid insulating materials in sheet form. TheADTR-2K is only the measuring instrument to test insulatingliquids, it should be used with a three-terminal oil test cell.A heater is required if the oil is to be tested at temperaturesspecified in international or national standards. A suitablesolid dielectric test cell is required for testing insulation insheet form.When excited with an AC source, the ADTR-2K measuresthe Voltage, Capacitance, Dielectric Loss and Frequency.Dissipation Factor (Tan Delta) or Power Factor iscalculated from the above measurements. To determinethe Dielectric Constant (∈), the measurements are carriedon an empty and a full test cell. The parameters of the testcell can also be entered manually, using the keypad.The operating procedure is menu driven & simple. The AC &DC test voltages are set using the front panel keypad. Testscan be programmed for the AC test between 200 to 2400volts and 100 to 1,000 volts for the DC test.After initial set-up, the oil test cell is filled with the oiltest sample & the test procedure is initiated. The test setperforms all the selected measurements automatically &the results are displayed on the front panel. The testresults can be transferred to a PC using the RS232 interface,printed using the Centronics parallel port, or stored in anon-volatile memory. The tests can also be repeated.S P E C I F I C A T I O N SDielectric Constant & Tan DeltaTest Voltage : 0 - 2400 VAC in 1 volt stepsat line frequency.Accuracy : ± 1% of outputCapacitance : 0 - 200 …. 1600 pFAccuracy : ± 0.1% of reading ± 0.1pFBest Resolution : 0.01 pFDielectric Constant : 1 to 20 when using a typicaloil testcell (C = ~70pF)Accuracy : ± 0.1%Resolution : 0.001Dissipation Factor (DF) : 0 - 1.000Accuracy : ± 1% of reading ± 0.0001Best Resolution : 0.00001 (10 -5 )Dielectric Loss : 0 - 10.00 wattsAccuracy : ± 1% of reading ±(10 -5 )Best Resolution : 0.001 milli watts (10 -6 watts)Cell Constant : Any cell acceptable; oil test cellwith 50 - 70 pF are ideal forOptimum performance.Resistance - ResistivityTest voltage : 100 - 1000 VDC in 1 volt stepsAccuracy : ±1% of settingResistance Range : 10 6 to 10 12 OhmsResolution : 3 digitsAccuracy : ±2% of reading upto 1GΩ,increasing to ±10% at high end.Resistivity : 10 9 to 10 15 Ω - cm with atypical test cell of 1000 cm.Resolution : 3 digits.Accuracy : ±2% of reading at 10 9 – 10 13 Ω-cm±5% of reading at 10 13 – 10 14 Ω-cm±10% of reading above 10 14 Ω-cm2
MEASUREMENTSManual Measurements : Separate and continuous measurements of C, DF and Resistivity can be made at a selected voltage.Automated Measurements : The test set will conduct one set of C, DF and Resistivity Measurements automatically and display results.Display: 240 by 128 dot LCD panel with back lighting.Keyboard: 20-key Keypad providing numeric and soft-function entries.OUTPUTSRS-232 Serial Port : Opto-isolated serial port for controlling the instrument from aPC and for outputting data to a PC.Centronics Port : Opto-isolated parallel drive for Centronics compatible printerData Storage: Capacity – upto 100 test results can be stored.CONNECTIONSTest voltage (HV) : Amphenol MVH Connector.Measuring Terminal (LV) : BNC connectorGround (GND) : BTI-30 TerminalSafety Interlock (INTLK) : 3 pin Audio connectorPower connection : IEC three terminal socketPOWER: 180 – 260 volts, 50Hz, 60VA or90 – 130 volts, 60Hz, 50VA.PHYSICALSize: 480 x 178 x 450mm, approximately.Weight: Approx. 18 kgs.REQUIRED ACCESSORIESSAMPLE WINDOWS SOFTWARE SCREENSOIL TEST CELLThis 3 Terminal Oil Test Cell is designed for routine and laboratory tan delta test on transformer oils andother electrical insulating liquids. The electrode of the cell is designed with a spherical bottom whichoffers more uniform stress on the oil as compared to electrode with tampered end.SPECIFICATIONSConstruction : 3 terminal configuration.Material : Stainless Steel 316.Cell Capacitance : 50 – 70 pFCell Electrode Spacing : 2 mmDimension : 90mm X 185mm.Weight : Approx. 2.5 kgs.OIL TEST CELL HEATERThe heater is a very compact unit and is used to heat the oil in the cell to the required temperature. Thisuses a high frequency induction heater which raises the temperature to 90 o C in 15 min approximately.A knob and a dial are provided to set the temperature at required level. A temperature sensing probeis supplied and this senses the temperature and stops heating of the oil once the set temperature isreached. Two LEDs are provided to indicate ‘heating on’ and ‘heating off’. To ensure safety, the built-inmicro switch interlock automatically trips the high voltage when the plexi cover of the heater is raised.SPECIFICATIONSPower Supply : 230VAC ±10%, 50Hz OR 110VAC ±10%, 60HzTemperature Range : 20 – 100 o CAccuracy of Temperature Control : ±2 o CDimension : 310 x 190 x 300mmWeight : Approx. 12 kgs3
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Automatic Dielectric Constant Tan Delta & Resistivity Test Set

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