Dranetz Digital Megohmmeter, DranISO® 5000D - 5kV

Features & Applications:

This Dranetz digital megohmmeter 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 5kV. 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. 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.

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.

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.

Features:

• Large measuring range from 0.4M ohms ... 1T ohms
• Variable test voltages, or in fixed steps of 100V, 250V, 500V, 1.0kV, 1.5kV, 2.0kV, 2.5kV, 5.0kV
• Polarization index and absorption ratio
• Voltage measurements to 1000V
• Frequency measurement from 15 Hz to 1 kHz
• Capacitance measurement from 0.1 to 5 ìF
• Measurement of electrical discharge
• Guard terminal for the compensation of surface currents
• 5m extension cable included as accessory
• Supply power from mains, internal set of storage batteries or external 12 V suppl
• Backlit dot matrix display
• Digital display of measured values and limit values, characteristic curve display for polarization index
• Timer function: 1 second to 100 minutes
• Nominal current amounts to 1 mA at a test voltage of 100V, 250V, 500V, or 1000 V per EN 61557 Parts 1 and 2 (VDE 0413)
• Storage up to 1,600 measurements can be stored

Specifications: