Container fire protection measures
2021-07-26
Causes and countermeasures of over-voltage phenomena in box-type substations
- Categories:Enterprise Dynamics
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- Time of issue:2021-07-26
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(Summary description)These two kinds of overvoltages of the transformer are transient processes with short acting time. The operating overvoltage of the relay protection calibrator is generally 3.0 to 4.5 times the rated voltage, while the atmospheric overvoltage value is very high, up to 8-12 times the rated voltage, and the voltage distribution in the winding is extremely uneven. Part of the turns are subject to high voltages. Therefore, necessary measures must be taken to prevent the occurrence of overvoltage and carry out effective protection.
Causes and countermeasures of over-voltage phenomena in box-type substations
(Summary description)These two kinds of overvoltages of the transformer are transient processes with short acting time. The operating overvoltage of the relay protection calibrator is generally 3.0 to 4.5 times the rated voltage, while the atmospheric overvoltage value is very high, up to 8-12 times the rated voltage, and the voltage distribution in the winding is extremely uneven. Part of the turns are subject to high voltages. Therefore, necessary measures must be taken to prevent the occurrence of overvoltage and carry out effective protection.
- Categories:Enterprise Dynamics
- Author:
- Origin:
- Time of issue:2021-07-26
- Views:0
Information
1. The concept of overvoltage:
When the transformer in the box-type substation is running, if the voltage of the relay protection calibrator exceeds its maximum allowable working voltage, it is called the overvoltage of the transformer.
2. Classification of overvoltage:
Overvoltage will often cause great harm to the insulation of the transformer, and even cause insulation breakdown.
Overvoltage can be divided into two types: atmospheric overvoltage and operating overvoltage:
(1) Atmospheric overvoltage: when the transmission line is directly struck by lightning or thundercloud discharge, the overvoltage caused by the drastic change of electromagnetic field is called atmospheric overvoltage;
(2) Operating overvoltage: When the transformer or line switch in the box-type substation is closed or opened, the overvoltage generated by the oscillation and accumulation of electromagnetic energy in the system is called the operating overvoltage.
These two kinds of overvoltages of the transformer are transient processes with short acting time. The operating overvoltage of the relay protection calibrator is generally 3.0 to 4.5 times the rated voltage, while the atmospheric overvoltage value is very high, up to 8-12 times the rated voltage, and the voltage distribution in the winding is extremely uneven. Part of the turns are subject to high voltages. Therefore, necessary measures must be taken to prevent the occurrence of overvoltage and carry out effective protection.
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