According to investigation and research data analysis, after the transformer was found out of the factory, it was found that the tap was connected incorrectly. For this type of transformer below 220KV, as long as the construction unit has a transformer error tester, it can also be tested to detect possible hidden dangers as soon as possible. Wuhan Dingsheng Power Automation Co., Ltd. is a manufacturer of transformer test equipment. DCBC-H transformer ratio tester produced by our company meets the transformer voltage ratio, and the ratio tester is used in power systems and transformer manufacturers and railway electrical systems. Transformer ratio, group, polarity, and angle tests. Transformer Ratio Tester is the ideal transformer ratio test equipment in modern power industry
Checking the transformer ratio of all taps requires no significant difference from the manufacturer's nameplate data, and should be consistent with the law of transformer ratio. The allowable error of the transformer ratio is in the power transformer with a winding voltage level of 220KV and above. ±5% when rated tap position.
The transformer transfer test project includes the following:
l Measure the DC resistance of the winding together with the bushing;
2. Measure the voltage ratio of all taps;
3. Check the polarity of the three-phase wiring group and single-phase transformer lead-out line of the transformer;
4. Measure the insulation resistance, absorption ratio or polarization index of the winding together with the bushing;
5. Measure the dielectric loss tangent of the winding together with the bushing;
6. Measure the DC leakage current of the winding together with the bushing;
7. AC withstand voltage test of the winding together with the bushing;
8. Partial discharge test of the winding together with the bushing;
9. Measure the insulation resistance of the bushing to the shell by the fastener and core grounding wire insulated from the iron core;
10, non-pure porcelain casing test;
11, insulation oil test;
12. Check and test of on-load pressure regulating switching device;
13. Impact test under rated voltage;
14, check the phase;
15, measure the noise.
Transformer voltage ratio refers to the ratio of the primary voltage to the secondary voltage when the transformer is idling, and is simply called the voltage ratio.
The voltage ratio test is one of the important test items in the transformer test.
Measuring transformer voltage ratio purpose
1. Check the correctness of turns ratio of transformer windings;
2, check the status of the tap;
3. After the transformer fails, the commonly used measurement ratio is used to check whether there is a short circuit in the transformer.
4. Whether the transformer tap is soldered incorrectly;
5. Check whether the transformer is damaged or changed during transportation;
6, determine whether the transformer can run in parallel.
When the voltage difference between the two side-by-side transformers operating in parallel is 1% of the rated voltage, the circulating current in the two transformers will reach about 10% of the rated current. This increases the loss of the transformer and takes up the capacity of the transformer.
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