Distribution transformer grounding system

Abstract

The invention relates to a distribution transformer grounding system, which is connected with a distribution transformer in the distribution network. The distribution transformer has an operation grounding point and a protection grounding point. The distribution transformer grounding system comprises an operation grounding device, a protection grounding device and a switch, wherein the operation grounding device is connected with the operation grounding point, the protection grounding device is connected with the protection grounding point, and the switch is connected between the operation grounding point and the protection grounding point so as to switch the grounding mode of the distribution transformer through opening and closing. The distribution transformer grounding system further comprises a control module which controls the switch to open and close, wherein the control module includes a remote signaling acquisition unit, a topology analysis unit, a grounding mode judgment unitand a remote control issuing unit. The distribution transformer grounding system can adjust the grounding mode according to actual requirements, thereby not only being capable of preventing users fromcontacting voltage dangers and improving the safety, but also being capable of ensuring the neural-point grounding safety and improving the reliability.

Description

technical field [0001] The invention belongs to the field of electric power system grounding, and in particular relates to a distribution transformer grounding system which can adjust its own grounding mode according to the grounding mode of an upper substation. Background technique [0002] The power system grounding system can be divided into two categories, one is a large current grounding system, which means that the neutral point is grounded directly or through a small resistance, and the other is a small current grounding system, which means that the neutral point is not grounded or is grounded through a high resistance, The arc suppression coil is grounded. In the past, the low-current grounding system could continue to operate for a period of time in the event of a single-phase ground fault, which is beneficial to improving the reliability of power supply for users and reducing the number of power outages for users, so it has been widely used in medium-voltage distri...

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Problems solved by technology

[0004] However, for the neutral point of the distribution transformer to be grounded separately, the grounding pole needs to be far away from the main grounding network of the distribution station, and farther away from the distribution station itself, so it is easily affected by other constructions. At this time, the neutral point grounding will be suspended or grounded The resistance is very large, thereby generating a neutral point voltage, which endangers the operation of the system

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