Power distribution network high voltage line single-phase line-breaking fault identification method and application

Abstract

The invention discloses a power distribution network high voltage line single-phase line-breaking fault identification system and method based on electric energy metering device. The power distribution network high voltage line single-phase line-breaking fault identification method comprises steps of using voltage phasor data of a two-phase line which is two-element electric energy metering device which performs high-voltage supply high-voltage metering to realize an identification function on a single-phase line-breaking fault of a 10kV power distribution line, using three-phase phase voltage phasor data measured by a high-voltage supply and low-voltage metering three-phase four-line system electric energy metering device to realize an identification function on the 10kV power distribution line single-phase line-breaking fault. In the power distribution network high voltage line single-phase line-breaking fault identification method and the application, massive electric energy metering devices having functions of single-phase line-breaking fault identification are installed, the electric energy metering devices upload the voltage phasor data and the single-phase line-breaking determination result to a remote main station for analysis, and a single-phase line-breaking fault interval of the 10kV power distribution network can be positioned according to a relative relation of installation positions.

Description

technical field [0001] The present invention relates to a single-phase disconnection fault identification technology of a distribution network, more specifically, to a single-phase disconnection fault identification method for a high-voltage line of a distribution network, and a single-phase disconnection fault detection method for a high-voltage line of a distribution network based on an electric energy metering device. Line fault identification system, and a single-phase disconnection fault identification method for distribution network high-voltage lines based on electric energy metering devices. Background technique [0002] The voltage level of the domestic medium-voltage distribution network system is generally 10kV or 35kV, and a three-phase three-wire system with an ungrounded neutral point or a small current grounded system is adopted. Among the fault types of distribution network lines, single-phase disconnection accounts for a large proportion. However, the relay ...

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Problems solved by technology

[0004] However, the limitation of the method disclosed in the above literature is that the fault identification device must be able to simultaneously collect three-phase line voltage phasor data on the distribution line as a single-phase disconnection fault identification criterion.

[0006] However, the electric energy metering device in the prior art cannot directly use the method disclosed in the above-mentioned documents to directly realize the single-phase disconnection judgment, and the reason is:

[0007] 1. The three-phase three-wire electric energy measurement of the high-power meter is a two-element measurement device, which can only measure the two-phase line voltage. The criterion described in the method disclosed in the above literature requires three line voltage phasor data, which cannot be directly used. The above-mentioned judgment method;

[0008] 2. The three-phase four-wire electric energy metering device with high supply and low meter is converted from high voltage to low voltage by the distribution transformer. The voltage amplitude and phase on the low voltage side have changed, and the accuracy of the measured voltage amplitude and phase angle data can Whether it satisfies the problem of applying to high-voltage side voltage protection or high-voltage line fault judgment, and there is no prior art disclosed

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