Fully automatic oil dielectric loss tester is a very basic method in insulation test, which can effectively find the overall moisture deterioration and local defects of electrical equipment insulation. It is widely used in electrical manufacturing, electrical equipment installation, handover and preventive testing. The measurement of the dielectric loss of transformers, transformers, reactors, capacitors, bushings, and arresters is the basic method to measure their insulation performance.
The high-voltage dielectric loss tester adopts frequency conversion anti-interference and Fourier transform digital filtering technology, fully automatic intelligent measurement, and the measurement data is very stable under strong interference. The dielectric loss tester is also known as the anti-interference and different frequency dielectric loss tester. The dielectric loss tester is widely used in the field dielectric loss measurement of transformers, transformers, bushings, capacitors, arresters and electromagnetic interference in the power industry.
The air humidity makes the dielectric loss measurement value increase abnormally (or decrease or even be negative) and unstable, and a shielding ring can be added if necessary. Because the artificially added shielding ring changes the electric field distribution of the test object, this method is controversial, and relevant regulations can be referred to. Due to long-term use, it is easy to cause a hidden circuit break of the test line, or a short circuit between the core wire and the shield, or poor contact of the plug. The user should maintain the test line frequently.
When testing standard capacitance samples, fully shielded plugs should be used to eliminate the influence of additional stray capacitance, otherwise the accuracy of the instrument cannot be reflected; when measuring CVT by self-excitation method, non-special high-voltage lines should be suspended in the air, otherwise there will be additional stray capacitance to the ground. Scattering capacitance and dielectric loss will cause measurement errors. Although the high-voltage wires of the system equipped with the instrument have passed the inspection before leaving the factory, we still need to keep away from the human body and low-voltage test wires when measuring.
Both the high-voltage core wire and the high-voltage shielded wire are not allowed to pass through the low potential and part of the grounding and test working circuit. Change the test equipment from the operating state to the maintenance state and clean it. After the preliminary insulation test, the test equipment can be used to prevent the poor insulation performance of the test equipment from damaging the instrument during the pressurization process.