CN201993434U - System for quickly positioning distribution network faults based on wireless sensor network - Google Patents

Abstract

The utility model provides a fast fault location system for a distribution network based on a wireless sensor network, which includes: a front-end data acquisition device, and a data receiving device, a data storage and display device, and the front-end data acquisition device includes at least a digital fault Indicator, wireless transceiver module, main control module, communication module and system power supply electrically connected with said digital fault indicator, wireless transceiver module, main control module, communication module, one said digital fault indicator and one said wireless The transceiver module is connected in communication, the main control module is connected in communication with each of the wireless transceiver modules, the main control module is connected in communication with the communication module, the communication module is connected in communication with the data receiving device, and the data The receiving device is communicatively connected to the data storage device, and the data storage device is communicatively connected to the display device. The system provided by the utility model can detect the running state of the distribution network dynamically in real time.

Description

A fast fault location system for distribution network based on wireless sensor network

technical field

The utility model relates to the technical field of sensing equipment, in particular to a fast fault location system for a distribution network based on a wireless sensor network.

Background technique

Distribution network (such as: 10KV distribution network) fault mainly includes two aspects, namely short circuit fault and ground fault.

Short-circuit fault indicators have been developed to this day, and the technology is relatively stable, but it is far from reaching the accuracy and maturity similar to relay protection devices. At present, the more prominent problems mainly include:

(1) The average value or peak value of the line current is used as the overcurrent mutation criterion. When the cable line is closed for power transmission with no load, or the overhead line is reclosed for power transmission, the non-faulty branch is started due to (re)closing inrush current The short-circuit criterion, and the circuit did not detect the electric field of the line to the ground in time, and mistakenly believed that the line was powered off, resulting in malfunction.

(2) Using the over-current mutation criterion, although there is no need to set the over-current setting value, there are also fatal shortcomings: A. When the two-phase ground is short-circuited, the current changes slowly, resulting in refusal to operate; B. Rural network line substation design The specified overcurrent current is too small (for example, 100A/0.3S), because the current mutation is insufficient, resulting in refusal to operate;

(3) When the line is short-circuited, because the non-faulty branch or the large-scale motor and energy storage capacitor behind the fault point feed back power to the short-circuit point, the power frequency attenuation current cannot be distinguished, resulting in malfunction.

(4) For the fault indicator of the flop display mode, when a large current is impacted, there may be a problem of magnetic field induction directly flopping or immediately returning, resulting in non-flopping and failure to return normally after flopping.

(5) In addition, in various high and low temperature, strong ultraviolet rays and salt spray environments, the performance of the device itself is also affected. In addition, due to improper selection of backup batteries, due to power consumption, leakage current, battery passivation and ambient temperature, The actual service life of the product is far lower than the design life; the imperfect design of the installation structure will also have a great negative impact on the operation of the equipment.

The technical development history of the ground fault indicator is very short. Using the fault indicator of the traditional short-circuit fault detection technology, the correct action rate of the better products is only about 65% (short-circuit fault). However, there is still a long way to go for the single-phase ground fault indicator of the small current grounding system to achieve the action accuracy of the short circuit fault indicator. This is because the ground fault of the small current grounding system only has a physical model in the theoretical world, and There is no definite mathematical model, and the mathematical models of each region, each substation, each line, each branch, and each grounding point are different.

Due to the above reasons, there is a need for a safe, reliable, accurate and timely fault location and detection method for distribution network, and the on-site detection signal is transmitted to the monitoring center and published on the internal safety production network of the power system, which is convenient for relevant Real-time monitoring, statistics and analysis of personnel. This scheme uses mature, low-cost, low-power wireless sensor network technology, and cooperates with GPRS technology to ensure the advanced nature of the system while maintaining system reliability. Each wireless detection module can be installed flexibly without wiring other lines, so it is safer and more reliable. In addition, after connecting the data of multiple measurement points into a network, it is convenient for unified management and realizes networked and automated management.

Utility model content

The utility model provides a fast fault location system of a distribution network based on a wireless sensor network capable of real-time and dynamic detection of the operation state of the distribution network.

In order to achieve the above object, the utility model provides the following technical solutions:

A fast fault location system for a distribution network based on a wireless sensor network, which includes: a front-end data acquisition device arranged on a distribution network line, and a data receiving device, a data storage and a display device arranged in a monitoring center, the The front-end data acquisition equipment at least includes a digital fault indicator, a wireless transceiver module, a main control module, a communication module, and a system power supply electrically connected to the digital fault indicator, a wireless transceiver module, a main control module, and a communication module. The digital fault indicator communicates with one of the wireless transceiver modules, the main control module communicates with each of the wireless transceiver modules, the main control module communicates with the communication module, and the communication module communicates with the The data receiving device is connected in communication, the data receiving device is connected in communication with the data storage device, and the data storage device is connected in communication with the display device.

Preferably, a fault indicator and a wireless transceiver module are respectively installed on each cable of the three-phase cables.

Preferably, the system power supply is a solar cell.

Preferably, the system power supply further includes a battery, and the battery is electrically connected to the solar cell.

By implementing the above technical scheme, it has the following technical effects: the system provided by the utility model can detect the operating state of the distribution network in real time and dynamically, and once a distribution network failure such as single-phase grounding or two-phase short circuit occurs, it will be detected by the local sensor The network receives fault data in time, and aggregates them to devices equipped with GPRS (Global System for Mobile Communications) network access points, and immediately returns them to the internal network of the power system, and can communicate with SCADA (Supervisory Control And Data Acquisition, data acquisition Interface with the monitoring and control) system to reflect the fault points and fault data to the production data. At the same time, according to the settings, the alarm (grounding, short circuit, etc.) deal with.

Description of drawings

Fig. 1 is a schematic structural diagram of a fast fault location system for a distribution network based on a wireless sensor network provided by an embodiment of the present invention.

Detailed ways

In order to better understand the technical solution of the utility model, the embodiments provided by the utility model will be described in detail below in conjunction with the accompanying drawings.

This embodiment provides a fast location system for distribution network faults based on wireless sensor networks, which includes front-end data acquisition equipment arranged on the distribution network lines, and also includes a data receiving device, data storage and display arranged in the monitoring center device, the front-end data acquisition equipment at least includes a digital fault indicator, a wireless transceiver module, a main control module, a communication module (in Fig. 1: a GPRS module) and the digital fault indicator, a wireless transceiver module, a main control module 1. The system power supply electrically connected to the communication module, one said digital fault indicator communicates with one said wireless transceiver module, and said main control module communicates with each said wireless transceiver module. In the utility model, said main The control module communicates with each of the wireless transceiver modules through a wireless sensor network, and in other embodiments, it may also communicate with each other in a wired manner. Each wireless module is individually addressed. Preferably, the digital fault indicator adopts a digital current transformer for detecting the current in the 10KV distribution network line,

The main control module is connected in communication with the communication module, and the communication module is connected in communication with the data receiving device. In the present utility model, the communication module is connected in communication with the data receiving device through the GPRS network. In other implementations In an example, the communication connection may also be performed through a wired communication connection or other networks.

The data receiving device is communicatively connected to the data storage device, and the data storage device is communicatively connected to the display device.

The main control module regularly communicates with each digital fault indicator through the wireless transceiver module, and sends the acquired data back to the monitoring center through the communication module connected to it through the mobile network; the system power supply provides power to the entire front-end data acquisition equipment; According to the network configuration, the monitoring center chooses to use GPRS module or wired Ethernet, and receives the remote data to the local data receiving device according to the agreement agreed in advance, and uses the data storage device to store the data. At the same time, the local Web ( Network) server is published on the internal network of the power system, displayed through the display device, and at the same time, provides an interface to connect to the SCADA system. And run the graphical detection software on Windows (operation window), the client can directly access the server through the IE browser, and query the fault status information of the detected corresponding distribution network (such as: 10KV distribution network).

Preferably, in order to detect each cable, a fault indicator and a wireless transceiver module are respectively installed on each cable of the three-phase cables.

In a preferred embodiment, in order to facilitate the power supply of the system and save energy. The system power supply is a solar cell. The solar cell provides a voltage of 12V and a current of 12Ah, and is equipped with a storage battery matched with the solar cell, and the storage battery is electrically connected to the solar cell. In order to provide enough power for the system in rainy weather.

1), the system provided by this embodiment has strong real-time performance and practicability. By regularly collecting and updating data, the real-time performance of the state information is guaranteed; Once the experience value is exceeded, an alarm signal can be sent to remind relevant personnel to take measures in time, which has high practicability.

2), the system provided by this embodiment selects digital fault indicators, so that it can complete the "four remote" functions, that is, remote signaling (short circuit, grounding, flopping), telemetry (measurement of 4 currents + 1 voltage + 1 temperature), remote control (flop, reset), remote adjustment (online adjustment parameters). It can also monitor real-time data such as sine wave current, self-feed voltage, battery voltage, etc.

3) The system provided by this embodiment is highly efficient and energy-saving. Each part of the device has been carefully designed for efficiency, and the energy distribution is reasonable, so that the power consumption of the device is extremely low. The classic piezoelectric sensor technology is used to wake up the device in time to ensure the accuracy of data collection. real-time, reliability.

4) The system provided by this embodiment is flexible and safe to use. Users can set parameters flexibly and conveniently according to their own needs. Whether it is a product, or a tool and its maintenance, it is safe and reliable.

The above is a detailed introduction of a distribution network fault rapid location system based on a wireless sensor network provided by the embodiment of the utility model. There will be changes in the scope of application. In summary, the content of this specification should not be understood as limiting the utility model.

Claims (4)

1. distribution network failure quick positioning system based on wireless sensor network, it is characterized in that, comprise: be arranged on the front end data acquisition equipment on the power distribution network circuit, and also comprise the data sink that is arranged on Surveillance center, data storage and display device, described front end data acquisition equipment comprises the digital fault indicator at least, radio receiving transmitting module, main control module, communication module and with described digital fault indicator, radio receiving transmitting module, main control module, the system power supply that communication module is electrically connected, a described digital fault indicator and a described radio receiving transmitting module communicate to connect, described main control module and each described radio receiving transmitting module communicate to connect, described main control module and described communication module communicate to connect, described communication module and described data sink communicate to connect, described data sink communicates to connect in described data storage device, and described data storage device communicates to connect in described display device.

2. as the distribution network failure quick positioning system of claim 1, it is characterized in that, a fault detector and a radio receiving transmitting module are installed respectively on the every cable of described threephase cable based on wireless sensor network.

3. as the distribution network failure quick positioning system of claim 1, it is characterized in that described system power supply is a solar cell based on wireless sensor network.

4. as the distribution network failure quick positioning system of claim 3 based on wireless sensor network, it is characterized in that described system power supply also comprises accumulator, described accumulator is electrically connected described solar cell.