HT Instruments HT7052 - Programmable Digital Insulation Tester, 10 KV

HT7052 has been developed to measure insulation resistance with test voltage programmable up to 10kVDC and measuring range up to 10TΩ which makes it very useful in any industrial application (tests on electric machines, power transformers, electric cables, electric boards, generic devices, etc.).

It is a professional high voltage insulation tester with added diagnostics tools such as Polarization Index (PI), Dielectric Absorption Ratio (DAR) and Dielectric Discharge (DD).

Professional insulation meter with test voltage up to 10KV DC

The device allows measuring parameters such as Polarization Index (PI) and Dielectric Absorption Ratio (DAR) and Dielectric Discharge (DD), diagnostic tests which allow determining the quality of an insulating material. It carries out “ramp” insulation tests and dielectric strength test in DC. HT7052 is supplied with NiMH rechargeable battery with integrated battery charger, which allows for a remarkable duration when carrying out measurements, it is provided with internal memory for saving measurements and it is also possible to connect it to the PC to download the measured results. The device has been inserted into a comfortable and resistant transport case, solid and safe for “on-site” use.
 

Description of Parts

How to Perform the Measurements

The purpose of insulation tests

Insulating materials are important parts of almost every electrical product. The material’s properties depend not only on its compound characteristics but also on temperature, pollution, moisture, ageing, electrical and mechanical stress, etc. Safety and operational reliability require the regular maintenance and testing of the insulation material to ensure it is kept in good operational condition. High voltage tests are used to test insulating materials

DC vs. AC testing voltage

Testing with a DC voltage is widely accepted as being useful as testing with AC and / or pulsed voltages. DC voltages can be used for breakdown tests especially where high capacitive leakage currents interfere with measurements using AC or pulsed voltages. DC is mostly used for insulation resistance measurement tests. In this type of test, the voltage is defined by the appropriate product application group. This voltage is lower than the voltage used in the withstanding voltage test so the tests can be applied more frequently without stressing the test material

Typical insulation tests

In general, insulation resistance tests consist of the following possible procedures:

• Simple insulation resistance measurement also called a spot test
• Measurement of the relationship between voltage and insulation resistance
• Measurement of the relationship between time and insulation resistance
• Test of residual charge after the dielectric discharge

The results of this test can indicate whether the replacement of the insulation system is required. Typical examples of where testing insulation resistance and its diagnosis are recommended are transformer and motor insulation systems, cables and other electrical equipment.