Capacitor tower for transformer Lab

In order to improve the reliability and security of power system operation, it is necessary to carry out temperature rise test for large transformers. Before finalization or grid connection of large transformers, temperature rise tests are generally required in the transformer manufacturer or the repair and inspection plant of the power system. The temperature rise value of each component of the transformer is one of the characteristic parameters of the transformer, and the transformer shall withstand the temperature rise test under the specified conditions. The purpose of the temperature rise test is to obtain the temperature rise value of each component of the transformer and verify the design data of the transformer to determine whether its temperature rise conforms to the limits specified in relevant standards.

Short circuit method is usually used in temperature rise test of large oil immersed transformer. The short-circuit method is to short circuit one side of the transformer and supply power to the other side. The test circuit is completely the same as the load test [2]. The test power supply can be obtained directly from the power grid or provided with its own test generator set. Because the tested transformer has a large capacity, it also needs a large capacity test power supply. Since the short-circuit impedance of the transformer is mainly reactance, the tested transformer with large capacity is actually a large inductive load, so the capacitor bank compensation method can be used when doing the temperature rise test, that is, the capacitive reactive current of the capacitor bank is used to compensate the inductive reactive current of the tested transformer, and the capacity of the test power supply can be determined according to the active loss capacity of the tested transformer. This greatly reduces the capacity of the required test power supply and saves the investment of the complete set of test equipment.

The primary structure principle, secondary control principle and its realization of compensation capacitor tower for large transformer temperature rise test. The system adopts the latest PLC programmable controller and pneumatic disconnector, which can not only flexibly and reliably adjust the voltage level and compensation capacity of the compensation capacitor tower, but also has the characteristics of high security, high intelligence and convenient operation. The system can meet the requirements of temperature rise test for large transformers with different voltage levels and capacities.

description2

description2