The short-circuit loss and the short-circuit voltage show the performance of the transformer. These values are recorded and guaranteed to the customer and are important for the operational economy. The short-circuit voltage is an important criterion, especially during parallel operations of the transformers. The short-circuit loss is data that is also used in the heat test.
Short-circuit voltage; is the voltage applied to the primary winding and causes the rated current to flow in the winding couples while one of the winding couples is short-circuited. The active loss measured during this, is called short-circuit loss. If the adjusting range is more than 5%, in addition to the rated value, the losses are repeated for the maximum and minimum values.
The short-circuit loss is composed of; "Joule " losses (direct current/DC losses) which are formed by the load current in the winding and the additional losses (alternating current/AC losses) in the windings, core pressing arrangements, tank walls, and magnetic screening (if any) by the leakage (scatter) fluxes.
Transformer short circuit impedance tester is used to measure the short circuit impedance for main transformers of Level 35KV and above under site and laboratory conditions. The tester is exquisitely designed with superior performance. The state-of-the-art single-chip microcomputer testing technology and digital signal processing technology have been adopted for its internal design, and the data measured by it are accurate; while a 7-inch touch color LCD screen has been used for its external design, displaying the operation menu in Chinese with more convenient touch operation. Meanwhile, it is equipped with a thermal printer and has the function of storage, which is convenient for data printing and storage. Thus, the data to be exported can be transferred to the computer via USB. It is an instrument to rapidly test whether the transformer winding is deformed or not on-site.