insulation resistance tester is suitable for insulation testing in maintenance, repair, testing and verification of various electrical equipment. The insulation resistance dividing line is uniform and clear, and the reading is accurate. Easy to handle and carry. Low power consumption, battery powered, long service life.
What happens when electrical insulation fails?
Electrical insulation is more than just plastic polymer materials that wrap wires. It is a complete system consisting of cable insulation, bushing insulator, intertube, motor and general equipment. Mechanical pressure, contamination, and temperature changes can all cause these components to deteriorate over time, resulting in current leakage. Current leakage can cause the following problems:
1. When the current generates heat through the insulation layer, it will deteriorate the insulation layer until the insulation fails, and a fire hazard will be formed.
2. The leakage current must return to the source, and it will flow back to the source through any available conductor, line pipe, pipe, water or ground. This unfavorable current creates dangerous voltages.
3. The leakage current efficiency is not high. The current leaking through the insulation does not drive the motor, does not emit light or heat, but still generates consumption.
4. The leakage current will cause the overcurrent protection device to trip, making the motor and transformer overheat. The result is poor electrical insulation, leading to equipment failure and production line shutdown. Now, no plant can afford an unplanned shutdown. "Customers need to diagnose faults quickly. No one wants to waste production time, and many customers are eager to know if they need to repair the equipment or simply replace it. ”
The role of insulation resistance tester:
By testing the insulation resistance of different components in the system (transformers, switchgear, wires, motors), technicians can isolate and repair faulty components. Technicians use testing to verify high insulation resistance between conductors and grounded or adjacent conductors. Two common examples are testing the insulation between the motor windings and the motor base, and checking the resistance between the phase conductor and the lap wire/cage. Before starting the system, use insulation tests to verify that it is intact and can improve system performance; Insulation testing can uncover manufacturing process problems and equipment defects that would normally go undetected until equipment fails. In the EU, testing is mandatory, even for civilian systems.