| DranISO 5000D - Digital High-Voltage Insulation Tester Test Voltages to 5000 V The instrument is suitable for non-destructive measurement of insulation resistance in electrical systems, as well as in machines, transformers, cables and electrical equipment utilized in, for example, locomotives, street cars and ocean going vessels with selectable test voltages of up to 5 kV. Voltage Measurement to 1000 V Testing for absence of voltage at the device under test in systems of up to 1 kV can be performed with the voltage measuring range. Discharging Capacitive Devices Under Test Capacitive devices under test such as cables and coils, which may be charged by the test voltage, are discharged by the measuring instrument. The falling voltage value can be observed at the display. Measurements per EN 61557 Parts 1 and 2 (VDE 0413) Nominal current amounts to 1 mA at a test voltage of 100 V, 250 V, 500 V or 1000 V. Highly Insulated Measurement Cables The highly insulated measurement cables are permanently connected for safety reasons, and due to technical measuring considerations. Danger resulting from inadvertently disconnected cables, for example in the event of charging caused by capacitive devices under test, is thus avoided. Polarization Index A polarization index test is recommended for electrical machines. This procedure involves expanded testing of insulation resistance. DC measuring voltage from the DranISO 5000D is applied to the insulation for a duration of 10 minutes. Measured values are documented after one minute, and after ten minutes. If the insulation is good, the value measured after ten minutes is higher than the value measured after one minute. The relationship between the two measurement values is the polarization index. Charged material within the insulation is aligned due to the application of measuring voltage over a long period of time, resulting in polarization. The polarization index indicates whether or not the charged material contained in the insulation can still be moved, thus allowing for polarization. This, in turn, is an indication of the condition of the insulation. Data Management and Report Generation The data of each measurement can be stored under a selected object number. Furthermore, a description for this object can be entered via the keyboard of the optional PSI module (Feature I1). The data management function allows for individual measurement data of a previously selected object to be displayed and to be deleted if required, or for previously entered objects to be deleted. Depending on the number of stored objects (max. 254), up to 1,600 measurements can be stored. The current memory occupancy is continuously displayed as a bar graph. |