In the branch of the capacitor under test, there is a sampling circuit that samples the voltage and current of the capacitor under test. The output terminals of the sampling circuit are respectively connected to amplifier circuits. The voltage signal output from the voltage amplifier circuit and the current signal output from the current amplifier circuit pass through a phase detector to output a phase difference signal. After the voltage signal and current signal pass through an A/D converter, they are input to the CPU for calculation to obtain the capacitance value of the capacitor under test. The moving current sampling unit allows direct measurement of capacitance without removing connecting wires. In addition, the gear during the measurement process is automatically selected, avoiding errors caused by manual operation, with good stability, good repeatability, accuracy, and reliability.
1. The YDQ series products have a completely new design concept, material selection, and process flow. Therefore, they are not only small in size, light in weight, and beautiful in appearance, but also all technical indicators meet international high-standard requirements.
The YDQ series products use high-quality cold-rolled DQ-151 oriented silicon steel sheets stacked into a multi-stage cylindrical frame-shaped iron core. On a specially made high-strength insulating cylinder, QZ type wires are used to directly and continuously wind the high-voltage tower-type coil. The shell is of suitable size and filled with SF6 gas.
2. The difference between YDQ (JZ) products and YDQ products is that the high-voltage rectifier silicon stack is cleverly installed inside the high-voltage bushing. By inserting and extracting the short-circuit rod, it can be switched between YDQ industrial frequency high-voltage AC output and high-voltage DC output.
3. The difference between YDQ (C) products and YDQ products lies in the structure inside the bushing and the structure of the high-voltage coil.
4. YDQW products are based on ordinary transformers, with improved process and technology, adopting different insulation structures, and the arc extinguishing capability of SF6 gas itself, so that under high voltage, the transformer basically has no partial discharge. Thus, when using this transformer as a high-voltage power supply for partial discharge tests on electrical equipment,
With the progress of basic scientific research in China and the application of new materials and new processes, the new medium sulfur hexafluoride gas has been pushed into the application field of power equipment. Due to the excellent insulation performance, arc extinguishing performance, and non-flammability of sulfur hexafluoride gas, it has been widely used as a new insulating medium, leading to the emergence of inflatable test transformers.
After years of efforts, the inflatable light-duty test transformer has been successfully developed. Compared with traditional oil-immersed light-duty test transformers, this series of products reduces weight by 20%-60% (depending on voltage and capacity level), and has no oil pollution. The voltage level of a single test transformer can reach 300KV. Due to the adoption of new production processes, the technical performance of the products has been greatly improved, especially suitable for on-site work and frequent mobile working conditions.
