Power distribution network's low voltage fault detection instrument and detection method

A low-voltage fault and fault detection technology, which is applied in the direction of fault location and fault detection according to conductor type, can solve problems such as misjudgment by emergency repair personnel, wire disconnection, arc light, etc., to meet safety requirements, reasonable structure composition, and detection methods simple effect
CN106526414APending Publication Date: 2017-03-22STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2017-03-22

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Abstract

The invention provides a power distribution network's low voltage fault detection instrument and detection method. The system consists mainly of a power supply part and a detection part. The power supply part uses a storage battery as its power supply; and the power is converted by an inverter into alternating current to be outputted. The detection part comprises converting the 220V voltage outputted from the power supply part into two shifts through a conversion bipolar switch before being outputted as 220V output of voltage shift and output of current shift. The method comprises: first, determining the type of a fault; determining whether there exists a fault or not through the exertion of voltage on a line and the feedback information from the line; in case of the generation of the maximum value of instant current if there exists a short circuit on the detected line, or rather the detected line impedance stands at zero, determining that fault exists on the line and that further detection is required; under the premise that the fault is determined, exerting a current value with certain magnitude onto the detected line continuously; using a clip type ammeter to search the flow direction and position of current; and utilizing the isolation function of an air switch to accurately spot the section of the line with the fault; and isolating and recovering the section of line with the fault.
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Description

technical field

[0001] The invention relates to a distribution network low-voltage fault detector and a detection method, belonging to the technical field of power grid fault detection. Background technique

[0002] In recent years, the construction investment of my country's distribution network (hereinafter referred to as distribution network) has been continuously increased, and the development of distribution network has achieved remarkable results. However, there is still a gap between the power supply level and the international advanced level, and the quality of power supply needs to be improved. Nowadays, power accidents are mainly concentrated in the distribution network, of which 0.4 kV low-voltage network faults account for 90%. Statistics show that 80% of the power company's emergency repair efforts are used to deal with 20% of the electricity consumption of electricity users.

[0003] There are various types of low-voltage faults in the distribution network. So...

Claims

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