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Testing the transformer fault data and analyzing the results shows that despite the aging trend and the use of different, the basic cause of the fault is still the same. A variety of factors may affect the expected life of the insulating material, and those responsible for the operation of the electrical equipment should give careful consideration. These factors include: misoperation, vibration, high temperature, lightning or inrush current, overload, three-phase load imbalance, insufficient maintenance of control equipment, poor cleaning, inadequate maintenance of idle equipment, improper lubrication, and misuse.
1, the cause of the failure analysis test transformer <br> <br> Here are the basic causes of the past few decades in the United States summed up the company HSB related transformer failure.
1.1 Inrush current. This category includes abnormal phenomena such as operation overvoltage, voltage peaks, line faults, and other transmission and distribution caused by misoperation, transformer solution parallelism, on-load tap changer arcing, and other causes. This type of cause accounts for the vast majority of transformer faults.
1.2 Test transformer insulation aging. Due to the insulation aging factor, the average life of the transformer is only 17.8 years, which is much lower than the life expectancy of 35 to 40 years. In 1983, the average life of the transformer was 20 years.
1.3 damp. This category of dampness includes the presence of water from floods, leaking pipes, leaking roofs, ingress of moisture along the casing or fittings into the tank, and in the insulating oil.
1.4 Test transformer overload. Overloading often occurs when the power plant or power department continues to slowly increase the load, eventually causing the transformer to run overloaded. Excessive temperatures cause premature aging of the insulation.
1.5 Lightning strikes. Lightning waves appear to be less research-intensive than previous studies. Unless they are specifically classified as lightning strikes, general shocks are classified as "circuit surges."
1. Test transformer 6 Three-phase load is unbalanced. Because of the long-term overload of a phase caused by the unbalanced three-phase load, the temperature of the phase is high and the insulation is deteriorated, resulting in a short circuit between windings or a phase-to-phase short circuit.
2, inspection of transformer operation
2.1 Due to different transformer load size, cooling conditions and seasons, the transformer in operation must not exceed the allowable value of the oil temperature in the upper layer, and should also be based on previous operating experience and comparison with the previous oil temperature under the above circumstances. If the oil temperature suddenly increases, you should check whether the cooling device is normal, whether the oil circulation is damaged, etc., to determine whether there is a fault inside the transformer.
2.2 The oil is normally transparent and slightly yellow, which can judge the quality of the oil. If the oil level is too high, check the use of the cooling device and if there is an internal fault.
2.3 Test Transformer should check whether the casing is clean, whether there are cracks and discharge traces, and the cooling device should be normal.
2.4 When the wind is strong, check whether the lead wire has severe swing. There should be no sundries at the top cover of the transformer and at the lead of the casing. When the snow falls, the contacts should not be melted or discharged immediately after snowfall. When there is heavy fog, there is no spark discharge phenomenon. and many more.
3, incident handling test transformer <br> <br> order to properly handle the accident, should have the following situation: the system operating mode, the load state, load type; Transformer top oil temperature, case temperature and voltage; accident weather There is no maintenance or other work around the transformer; whether the operation personnel have operations; whether the system has operations; what kind of protection actions, accident phenomena and so on. A common fault in the operation of a transformer is the failure of the windings, bushings and voltage tap-changers, and there are fewer failures of the iron core, fuel tank and other accessories. Here are some common major faults as follows:
3.1 Test Transformer winding faults are mainly short circuits in windings, grounding of windings, phase-to-phase short circuits, broken wires, and open joints.
1, the cause of the failure analysis test transformer <br> <br> Here are the basic causes of the past few decades in the United States summed up the company HSB related transformer failure.
1.1 Inrush current. This category includes abnormal phenomena such as operation overvoltage, voltage peaks, line faults, and other transmission and distribution caused by misoperation, transformer solution parallelism, on-load tap changer arcing, and other causes. This type of cause accounts for the vast majority of transformer faults.
1.2 Test transformer insulation aging. Due to the insulation aging factor, the average life of the transformer is only 17.8 years, which is much lower than the life expectancy of 35 to 40 years. In 1983, the average life of the transformer was 20 years.
1.3 damp. This category of dampness includes the presence of water from floods, leaking pipes, leaking roofs, ingress of moisture along the casing or fittings into the tank, and in the insulating oil.
1.4 Test transformer overload. Overloading often occurs when the power plant or power department continues to slowly increase the load, eventually causing the transformer to run overloaded. Excessive temperatures cause premature aging of the insulation.
1.5 Lightning strikes. Lightning waves appear to be less research-intensive than previous studies. Unless they are specifically classified as lightning strikes, general shocks are classified as "circuit surges."
1. Test transformer 6 Three-phase load is unbalanced. Because of the long-term overload of a phase caused by the unbalanced three-phase load, the temperature of the phase is high and the insulation is deteriorated, resulting in a short circuit between windings or a phase-to-phase short circuit.
2, inspection of transformer operation
2.1 Due to different transformer load size, cooling conditions and seasons, the transformer in operation must not exceed the allowable value of the oil temperature in the upper layer, and should also be based on previous operating experience and comparison with the previous oil temperature under the above circumstances. If the oil temperature suddenly increases, you should check whether the cooling device is normal, whether the oil circulation is damaged, etc., to determine whether there is a fault inside the transformer.
2.2 The oil is normally transparent and slightly yellow, which can judge the quality of the oil. If the oil level is too high, check the use of the cooling device and if there is an internal fault.
2.3 Test Transformer should check whether the casing is clean, whether there are cracks and discharge traces, and the cooling device should be normal.
2.4 When the wind is strong, check whether the lead wire has severe swing. There should be no sundries at the top cover of the transformer and at the lead of the casing. When the snow falls, the contacts should not be melted or discharged immediately after snowfall. When there is heavy fog, there is no spark discharge phenomenon. and many more.
3, incident handling test transformer <br> <br> order to properly handle the accident, should have the following situation: the system operating mode, the load state, load type; Transformer top oil temperature, case temperature and voltage; accident weather There is no maintenance or other work around the transformer; whether the operation personnel have operations; whether the system has operations; what kind of protection actions, accident phenomena and so on. A common fault in the operation of a transformer is the failure of the windings, bushings and voltage tap-changers, and there are fewer failures of the iron core, fuel tank and other accessories. Here are some common major faults as follows:
3.1 Test Transformer winding faults are mainly short circuits in windings, grounding of windings, phase-to-phase short circuits, broken wires, and open joints.
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