CN202057756U - Distribution network fault locating system based on fault indicator - Google Patents

Abstract

The utility model discloses a distribution network fault location system based on a fault indicator, which includes a fault indicator, a data collector and a background monitoring system, wherein the fault indicator includes a field strength sensor, a current transformer, a signal processing circuit, and a control circuit and wireless communication module; it also includes a power-taking coil, a protection circuit, and a power management circuit. The iron core of the current transformer is made of stainless steel soft magnetic material. The input terminal of the protection circuit is connected, and the output terminal of the protection circuit is used to charge the battery in the fault indicator through the power management circuit. The iron core of the current sensor in the fault indicator in the utility model is made of stainless steel soft magnetic material, which does not rust, has high initial magnetic permeability, and high measurement accuracy; The current (magnetic field) self-powered technology provides energy for wireless communication and makes the product last longer.

Description

A distribution network fault location system based on fault indicator

technical field

The utility model relates to the field of fault location in a distribution network, in particular to a distribution network fault location system based on a fault indicator.

Background technique

At present, the distribution network directly contacts users, and its reliable power supply capacity and power supply quality are not only a direct reflection of the economic benefits of power companies, but also immeasurable social benefits. As an important content of distribution automation, automatic fault location of distribution network has a great impact on improving the reliability of power supply, and has also received more and more attention. The power distribution system is complicated due to the many branch lines. When the system fails, it often takes a lot of manpower, material resources and time to find out the specific fault location. Although there are many researches on fault location, and various molded products are available, they basically require manual on-site search, and the level of automation is not high; there are also automated fault location systems, but the wireless communication energy is relatively large, such as only relying on internal batteries for power supply , the service life is short and the measurement accuracy is not high.

Utility model content

The purpose of the utility model is to provide a distribution network fault location system based on a fault indicator, which has high measurement accuracy and long service life.

The utility model adopts the following technical solutions: a distribution network fault location system based on a fault indicator, including a fault indicator, a data collector and a background monitoring system, wherein the fault indicator includes a field strength sensor, a current transformer, a signal processing The circuit, control unit and wireless communication module also include a power-taking coil, a protection circuit, and a power management circuit. The iron core of the current transformer is made of stainless steel soft magnetic material, and one end of the power-taking coil is connected in series with the measuring coil of the current transformer, and the other end is It is connected with the input terminal of the protection circuit, the output terminal of the protection circuit is connected with the input terminal of the power management circuit, and the output terminal of the power management circuit is used for charging the battery in the fault indicator.

The data collector includes a communication module and a control module, the control module is powered by a photovoltaic cell, and the data port of the control module is connected to the wireless communication module.

The background monitoring system includes a monitoring master station, an enterprise server and a communication network, the enterprise server communicates with the data collector through the communication network, and the enterprise server is connected to the monitoring master station.

The utility model is a set of automatic and efficient fault point detection and positioning system based on fault indicator technology and GSM communication technology, which is mainly used for automatic detection and positioning of various fault points in power distribution systems, including interphase short circuit and single phase ground fault detection and localization. The iron core of the current sensor in the fault indicator in the utility model is made of stainless steel soft magnetic material, which does not rust, has high initial magnetic permeability, and high measurement accuracy; The load current (magnetic field) self-power technology provides energy for wireless communication and makes the product last longer, so as to ensure that the service life of the fault indicator reaches ten years; the data collector also adopts self-power technology, and the entire system uses The life span is also longer.

Description of drawings

Fig. 1 is the circuit diagram of the utility model;

Fig. 2 is the circuit block diagram of the fault indicator of the present utility model;

Fig. 3 is a circuit block diagram of the data collector of the present invention.

Detailed ways

As shown in Figure 1, the distribution network fault location system based on the fault indicator of the utility model includes a fault indicator FCI, a data collector DCU and a background monitoring system, and the background monitoring system includes a monitoring master station, an enterprise server and a communication network (GSM mobile Network), the enterprise server communicates with the data collector through the communication network, and the enterprise server is connected with the monitoring master station. As shown in Figure 2, the fault indicator includes a field strength sensor 1, a current transformer 2, a signal processing circuit, a control unit and a wireless communication module, as well as a power-taking coil 4, a protection circuit and a power management circuit, wherein the power-taking coil 4 It is connected in series with the measuring coil 3 of the current transformer 2, the iron core of the current transformer 2 is made of stainless steel soft magnetic material, the output terminal of the power-taking coil 4 is connected with the input terminal of the protection circuit, and the output terminal of the protection circuit is connected with the input terminal of the power management circuit The terminal is connected, and the output terminal of the power management circuit is used to charge the battery 5 in the fault indicator. Among them, the protection circuit and the power management circuit are used to make the power supply work safely and reliably, which is a mature technology; the signal processing circuit includes a signal conditioning circuit and a transient processing circuit, which is a prior art. The fault indicator adopts a low power consumption circuit, and the iron core of the current transformer 2 is made of stainless steel soft magnetic material, which does not rust, has high initial magnetic permeability, and high measurement accuracy; The self-powered technology of small load current (magnetic field) provides energy for wireless communication and makes the product last longer, so as to ensure that the service life of the fault indicator reaches ten years. As shown in Figure 3, the data collector includes a communication module and a control module. The control module is powered by a photovoltaic cell 7 and a storage battery 8. The data ports of the control module are respectively connected with the wireless communication module and the GPRS communication module. The wireless communication module and the fault Indicator communication, GPRS communication module connection and communication network communication. The data collector DCU provides two-way, multi-master wireless communication networking (local) and remote GPRS communication technology, online monitoring and distribution network automation interface functions, and also realizes the power-taking technology of solar panels in rainy weather, providing wireless communication and backup battery to provide power. the

As shown in Figure 1, Figure 2, and Figure 3, firstly, the fault indicator FCI is installed on each line and branch line. When the line is running normally, the fault indicator FCI collects the current (steady state, transient state) of line 6 in real time. , voltage data, the data collector DCU uses the POLLING protocol (question-and-answer transmission) to poll each fault indicator, and the fault indicator responds according to the preset communication strategy, that is, according to the preset interval time and choose a wireless The FM channel (64 independent wireless channels in total) actively sends real-time data such as current and voltage to the data collector DCU. When the load current is greater than 20A, the communication energy can be fully obtained, and "answer every question" can be achieved during communication; when the load current is less than 20A, only limited electric energy can be obtained, and "two questions and one answer" will appear during communication " or "ten questions and one answer", the internal wireless communication module of the fault indicator is dormant at other times to reduce battery consumption, and it will also "wake up" at regular intervals to receive and execute the remote control of the master station (turn over, reset ) and parameter adjustment commands. For the 10KV distribution network system, when a short-circuit fault or ground fault occurs in the line, the fault indicator can detect the fault current and voltage variation. Send to the data collector DCU. The data collector DCU regularly reports the summoning request. After receiving the summoning command, it uploads the data to the public mobile network GSM, and the background monitoring system receives or sends the data via Ethernet. The background monitoring system receives various information of the fault indicator FCI installed on site, and through topology analysis, gives the fault event information of the fault section and fault time, and records the fault information (fault event record, maximum current value, maximum voltage change amount ). At the same time, the fault location information can be sent to the mobile phones of relevant personnel through GSM short messages, helping maintenance personnel to rush to the scene quickly, eliminate faults, and restore normal power supply. For the ground fault of 10KV distribution network, due to the small ground current component, it is a difficult problem to judge the ground fault. Since the current transformer adopts high initial magnetic permeability material, the current detection accuracy is greatly improved, which also improves the judgment. The success rate of ground fault improves the working efficiency of the whole system.

Claims (3)

1. A distribution network fault location system based on a fault indicator, including a fault indicator, a data collector and a background monitoring system, wherein the fault indicator includes a field strength sensor, a current transformer, a signal processing circuit, a control unit and a wireless communication The module is characterized in that it also includes a power-taking coil, a protection circuit, and a power management circuit, wherein the iron core of the current transformer is made of stainless steel soft magnetic material, one end of the power-taking coil is connected in series with the measuring coil of the current transformer, and the other end is connected with the protection circuit The input end of the protection circuit is connected to the input end of the power management circuit, and the output end of the power management circuit is used to charge the battery in the fault indicator. 2. The distribution network fault location system based on the fault indicator according to claim 1, characterized in that: the data collector includes a communication module and a control module, the control module is powered by a photovoltaic cell, and the data of the control module The port is connected to the communication module. 3. The distribution network fault location system based on the fault indicator according to claim 1 or 2, characterized in that: the background monitoring system includes a monitoring master station, an enterprise server and a communication network, and the enterprise server communicates with data through the communication network The collector communicates, and the enterprise server is connected to the monitoring master station.

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