How to adjust gear of dry-type transformer

For 10/0.4 kv dry-type transformer, voltage regulation should be power cut operation

　　Separate the low-voltage feed circuit breaker, disconnect the high-voltage switch, connect the high-voltage side to the ground and open the door of the transformer room. You will see three transfer poles on the transformer. There are six terminals on each transfer post. Under normal circumstances, two terminals are short connected with connecting plates, when adjusting, refer to the instructions to adjust the position of the connecting piece on the terminal to achieve the purpose of voltage regulation (instructions can be found next to the terminal or on the nameplate of the transformer, there are also separate instructions) separate the low-voltage feed circuit breaker and disconnect the high-voltage switch, when the high-voltage side is grounded and the door of the transformer room is opened, you will see three transfer poles on the transformer. There are six terminals on each transfer post. Under normal circumstances, two terminals are short connected with connecting plates, when adjusting, refer to the instructions to adjust the position of the connecting piece on the terminal to achieve the purpose of voltage regulation (instructions can be found next to the terminal or on the nameplate of the transformer, there are also separate instructions) normal dry-type transformers can be within plus or minus 5% , adjust the voltage in five stages. That is, to adjust the high-voltage coil of the voltage-regulating connection to change the position of the output voltage. General up-regulation of each gear down about 10V, down-regulation of each gear up about 10V. Remember to adjust after a power cut, and the three coils should be adjusted to the same gear. The primary side of the transformer is all designed with "tap-changer" . Taking 10KV transformer as an example, 500V can be adjusted up and down on the primary side, namely: 9500V, 1000v, 10500V oil-immersed transformer has two structures, namely on-load tap changer and no-load tap changer. When adjusting the primary tap on the high side of the surface of the transformer, the primary high voltage power supply should be cut off. The high voltage tap is connected to the 10500V terminal, and the low voltage tap is connected to the 9500V terminal. Dry-type transformer test items are divided into conventional test, special test (also known as type test) . The routine test is one that must be done before each transformer leaves the factory, which are: 1. DC RESISTANCE TEST 2. POWER FREQUENCY WITHSTAND VOLTAGE TEST 3. Variable ratio test. 4. Frequency doubling voltage withstand test (commonly known as induction)5. No load 6. Load test 7. Insulation test. Type test is the test to be done for the new type of product. They are: . Lightning impulse test 2. Partial discharge test 3. Sudden Short circuit test.