First, the maintenance of power transformers: 1 oil sample test - pressure, impurities and other performance indicators are carried out every three years, the transformer long-term full load or overload operation can shorten the cycle.
2 The high and low voltage insulation resistance is not lower than 70% (10MΩ) of the original factory value. The DC resistance of the winding should be no more than 2% at the same temperature. It should not be compared with the previous measurement. More than 2%.
3 Transformer working grounding resistance value is measured every two years.
4 The cycle of power-off cleaning and inspection is determined according to the surrounding environment and load conditions, usually from half a year to once a year. The main contents are __clearing the defects found in the inspection, cleaning, cracking or aging pad replacement of porcelain casing, connecting Check the tightening, oil shortage, respirator silicone check and replace.
Second, the grounding of the power transformer: 1 The outer casing of the transformer should be reliably grounded, the working zero line and the neutral point grounding line should be laid separately, the working zero line can not be buried underground.
2 The neutral point grounding circuit of the transformer should be made into a detachable connecting bolt near the transformer.
3 The transformer with the valve arrester should be grounded to meet the requirements of the Trinity; that is, the neutral point of the transformer, the transformer casing and the grounding of the arrester should be connected to a common ground.
4 grounding resistance should be ≤ 4 ohms.
2 The high and low voltage insulation resistance is not lower than 70% (10MΩ) of the original factory value. The DC resistance of the winding should be no more than 2% at the same temperature. It should not be compared with the previous measurement. More than 2%.
3 Transformer working grounding resistance value is measured every two years.
4 The cycle of power-off cleaning and inspection is determined according to the surrounding environment and load conditions, usually from half a year to once a year. The main contents are __clearing the defects found in the inspection, cleaning, cracking or aging pad replacement of porcelain casing, connecting Check the tightening, oil shortage, respirator silicone check and replace.
Second, the grounding of the power transformer: 1 The outer casing of the transformer should be reliably grounded, the working zero line and the neutral point grounding line should be laid separately, the working zero line can not be buried underground.
2 The neutral point grounding circuit of the transformer should be made into a detachable connecting bolt near the transformer.
3 The transformer with the valve arrester should be grounded to meet the requirements of the Trinity; that is, the neutral point of the transformer, the transformer casing and the grounding of the arrester should be connected to a common ground.
4 grounding resistance should be ≤ 4 ohms.
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