Grounding transfer current detection compensation device and working method thereof

Abstract

The invention discloses a grounding transfer current detection compensation device and a working method thereof. The device is characterized in that a first current transformer (11) is connected between a moving contact of a high pressure switch (9) and a grounding terminal (10) of the device in series; the input end of a controller (7) is electrically connected with a voltage transformer (2) and the first current transformer (11); the output end of the controller (7) is electrically connected with the control end of the high pressure switch (9); the high pressure switch (9) is in parallel connected with an arc suppression part, wherein one end of an arc suppression coil (5) is electrically connected with a neutral point of a grounding transformer (3) through a second current transformer (4), the other end of the arc suppression coil (5) is electrically connected with the grounding terminal (10); a secondary coil of the arc suppression coil (5) is electrically connected with the controller (7) through a programmable power supply (6); and the controller (7) is electrically connected with the second current transformer (4). The working method comprises the following steps of obtaining a capacitor-current value of a fault phase from the first current transformer when the high pressure switch of the fault phase is closed, so as to start the arc suppression coil to produce compensation current. The device and method provided by the invention can be used for 3-66 kV neutral point non-directly grounding systems.

Description

technical field [0001] The invention relates to a compensation device and a working method, in particular to a ground transfer current detection compensation device and a working method thereof. Background technique [0002] In my country's 3-66KV neutral point non-directly grounded system, single-phase ground fault is the most common fault. In order to solve the harm caused by this kind of fault, people often use an arc extinguishing device with a high-voltage switch connected between the busbar and the ground. The arc extinguishing device is composed of a control terminal of a high-voltage switch electrically connected to an output terminal of a controller, and an input terminal of the controller electrically connected to a secondary side of a voltage transformer. When a single-phase ground fault occurs in the system, it is directly grounded by closing the high-voltage switch of the faulty phase, so as to transfer the capacitive current of the system at the fault point to...

AI Technical Summary

Problems solved by technology

However, this arc extinguishing device has disadvantages. Firstly, when the high-voltage switch contact of the faulty phase is closed, it is easy to be burned due to the passage of excessive capacitive current in the system; secondly, the voltage of the non-faulty phase will also be damaged. Rising due to grounding of the faulted phase, causing general damage to the insulation of equipment in the system

Images