Secondary electric leakage protection monitoring system of distribution network

Abstract

The invention provides a secondary electric leakage protection monitoring system of a distribution network. The system comprises a monitoring meter box installed on a terminal of the distribution network and a data management system connected with the monitoring meter box. The monitoring meter box comprises an intelligent ammeter, an electric leakage protector and a metering current transformer. The electric leakage protector is connected with an intelligent capacitor and comprises a remaining current action circuit breaker. The monitoring meter box is connected with the data management system through a monitoring network, and the monitoring network comprises a local sensor network and a remote wireless network. Due to the scheme, power supply reliability and power supply quality can be improved, the electricity demand of production and life of the masses can be guaranteed to the maximum extent, and the satisfaction degree of users is improved; the safe operation level of equipment is improved, and personal safety accidents and electrical equipment accidents are reduced; user disputes are reduced, and social harmony is guaranteed, the equipment maintaining level and the labor efficiency are improved, and maintaining workloads of staff are reduced. Due to the system, an expected target is achieved, and the system has popularization value.

Description

technical field [0001] The invention relates to the technical field of distribution network automation protection systems, in particular to a distribution network secondary leakage protection monitoring system. Background technique [0002] At present, the user measurement lines in rural distribution stations are seriously aging and damaged, and there are great hidden dangers of electric leakage. Personal safety accidents occur from time to time, which has caused great harm to safe production and people's lives. The economic compensation caused by personal accidents is often in the millions It has brought great economic loss and serious negative social impact to the power supply company, and even more seriously, it may affect social stability. [0003] Although the Ministry of Rural Power Grids of the State Grid promulgated the "Principles for the Configuration of Residual Current Action Protectors in Rural Low-Voltage Power Grids of the State Grid Corporation" in order ...

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Problems solved by technology

[0002] At present, the user measurement lines in rural distribution stations are seriously aging and damaged, and there are great hidden dangers of electric leakage. Personal safety accidents occur from time to time, which has caused great harm to safe production and people's lives. The economic compensation caused by personal accidents is often in the millions It has brought huge economic losses and serious negative social impact to the power supply company, and even more seriously, it may affect social stability.

[0003] Although the Ministry of Rural Power Grids of the State Grid promulgated the "Principles for the Configuration of Residual Current Action Protectors in Rural Low-Voltage Power Grids of the State Grid Corporation" in order to standardize the configuration of residual current protection workers in the station area and improve the installation rate and commissioning rate of the station area in 2012. , but there are still many problems that are difficult to solve in the field operation. Typical problems include: 1. The operation of the secondary leakage protection is unstable, and the lack and low quality of the third-level protection cause frequent tripping of the secondary leakage protection switch

Some electricians can't deal with it, and often take measures to avoid tripping by withdrawing the protection function of the secondary leakage protection switch privately, so that the entire station area is in an operating state without leakage protection, which poses a great safety hazard, but the superior unit has no monitoring means and cannot be discovered in time stop

2. The third-level leakage protection is missing, and the quality of the user-side household protection switch is poor, or the user does not install the third-level leakage protection, which makes the third-level protection useless. The user's personal safety guarantee actually needs the second-level leakage protection switch to undertake, and its performance requirements are very high. High, but the current secondary leakage protection switch can not meet this requirement

3. There is no leakage current monitoring. The superior management department and technical department cannot grasp the operation status of the leakage protection switch and the leakage current operation data on site. On-site problems can only be solved when the district is being renovated, but at present it is almost impossible to effectively prevent them manually. It is a ticking time bomb for rural network security and urgently needs to be solved through technical means.

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