CN110596525A

CN110596525A - High-voltage power cable fault detection system

Info

Publication number: CN110596525A
Application number: CN201810601961.6A
Authority: CN
Inventors: 李制林
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-12
Filing date: 2018-06-12
Publication date: 2019-12-20

Abstract

The invention discloses a high-voltage power cable fault detection system which comprises a plurality of detection devices, a plurality of data acquisition devices, a remote monitoring center, a plurality of monitoring devices and a control center, wherein the detection devices are distributed on a power cable between a high-voltage wire and a transformer; the detection device comprises a Hall sensor, a signal conditioning circuit, an A/D conversion circuit, a microprocessor and a communication interface which are connected in sequence; the communication interface of the detection device sends the encrypted data to the data acquisition device; the data acquisition device is in communication connection with the remote monitoring center; the invention collects the line data in real time through the detection device arranged on the high-voltage line and the detection device arranged on the low-voltage line and sends the line data to the remote monitoring center through the data collection device, and the remote monitoring center carries out analysis and processing, thereby being capable of finding line faults in time, being convenient for maintenance and processing, improving the maintenance efficiency and ensuring the personal safety.

Description

High-voltage power cable fault detection system

Technical Field

The invention relates to the technical field of power transmission, in particular to a fault detection system for a high-voltage power cable.

Background

After the power cable is installed and used, cable faults sometimes occur, so that normal power supply cannot be carried out. Since the power cables are installed together in a group, when a power cable fails, the failed power cable needs to be found out from the group of power cables for processing. At present, adopt power cable fault detection appearance to detect power cable's fault point usually, however, when using fault detection appearance to detect, need the maintainer to hold fault detection appearance along the line and detect, not only waste time and energy, the condition of detection error can appear often moreover, can take place the accident of personal danger even.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a high-voltage power cable fault detection system which is accurate in detection, high in efficiency and convenient to use.

The invention is realized by the following technical scheme:

a high-voltage power cable fault detection system comprises a plurality of detection devices, a plurality of data acquisition devices and a remote monitoring center, wherein the detection devices are distributed and installed on a power cable between a high-voltage line and a transformer; the detection device comprises a Hall sensor, a signal conditioning circuit, an A/D conversion circuit, a microprocessor and a communication interface which are connected in sequence; the detection device is in communication connection with a data acquisition device, and the data acquisition device is in communication connection with a remote monitoring center; and the communication interface of the detection device sends the encrypted data to the data acquisition device through the short-distance wireless network, the RS-485 serial bus or the optical fiber communication interface module.

Furthermore, the data acquisition device comprises a processor, and a display device, a communication interface and an alarm which are connected with the processor.

Further, the remote monitoring center comprises a data processing server, a database server and an operation terminal.

The invention has the following advantages and beneficial effects:

1. the invention collects the line data in real time through the detection device arranged on the high-voltage line and the detection device arranged on the low-voltage line and sends the line data to the remote monitoring center through the data collection device, and the remote monitoring center carries out analysis and processing, thereby being capable of finding line faults in time, being convenient for maintenance and processing, improving the maintenance efficiency and ensuring the personal safety.

2. The invention can rapidly detect the conversion efficiency of the transformer through the detection devices arranged on the two sides of the transformer, is convenient for replacing aged and fault transformers in time, avoids the waste of electric energy, achieves the purposes of energy conservation and emission reduction, and also plays a role in preventing cable faults.

3. The invention adopts a digital detection device, and realizes complete electrical isolation of a detection node from the outside after the Hall sensor and a short-distance wireless network or an optical fiber are used for communicating with data acquisition and transmission equipment, thereby ensuring the safety of system operation.

4. The invention adopts a plurality of communication modes to realize data transmission and transmission, ensures the accuracy and reliability of data, provides a reliable data source for data analysis and improves the accuracy and stability of fault detection.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic view of the apparatus of the present invention in connection therewith;

FIG. 2 is a block circuit diagram of a detection device;

fig. 3 is a circuit block diagram of a data acquisition device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

A high-voltage power cable fault detection system is shown in figure 1 and comprises a plurality of detection devices which are distributed and installed on a power cable between a high-voltage line and a transformer, a plurality of detection devices which are installed on the power cable between the transformer and user electric equipment, a data acquisition device connected with each detection device and a remote monitoring center. The detection device can be connected with the data acquisition device in a short-distance wireless network, RS485 serial bus mode or an optical fiber mode, and the data acquisition device is connected with the remote monitoring center through a 3G network, a LAN network or an optical fiber network. The following describes each part of the system:

as shown in fig. 2, the detection device includes a hall sensor, a signal conditioning circuit, an analog-to-digital conversion circuit, a microprocessor, and an external communication interface, which are connected in sequence. The Hall sensor can convert the magnetic field intensity generated when current passes through the cable into a corresponding voltage signal or current signal and output the voltage signal or current signal to the signal conditioning circuit; the signal conditioning circuit can carry out filtering, amplitude limiting, amplification, normalization and other processing on the signals collected by the Hall sensor and then sends the signals to the analog-to-digital conversion circuit; the analog-to-digital conversion circuit can convert the analog signal of the front stage circuit into a digital signal and send the digital signal to the microprocessor; the microprocessor encrypts a voltage signal or a current signal of the received digital signal and then sends the encrypted voltage signal or current signal to an external communication interface; the external communication interface can send the encrypted data to the data acquisition device through interface modules such as a short-distance wireless network, an RS-485 serial bus or optical fiber communication.

As shown in fig. 3, the data acquisition device includes a microprocessor, and a liquid crystal display, an external communication interface, an audible alarm and a network communication interface connected to the microprocessor. The external communication interface adopts interface modules such as a short-distance wireless network, an RS-485 serial bus or optical fiber communication and the like and is used for receiving data sent by the detection device; the microprocessor can carry out primary processing on the data collected from the detection device, encrypt the data and send the encrypted data to the network communication interface, and receive the data of the remote data center and send the data to the liquid crystal display screen for displaying; the network communication interface can complete the communication work between the data acquisition and transmission device and the remote monitoring center, and can adopt a 3G wireless network, a LAN network, an optical fiber network and the like; the liquid crystal display screen can display information sent from the remote data center; the sound alarm is used for sending out sound prompt when a fault is found. The data acquisition device can be connected with a plurality of detection devices to receive and collect data of each detection node, perform preliminary analysis on the received data, for example, detect the validity of the data (whether the data is a detection point ID registered during installation), and finally package, compress and encrypt the data of each detection node and send the data to a remote monitoring center through a network interface.

The remote monitoring center is formed by connecting a data processing server, a database server and an operation terminal through a network. The data processing server receives the data transmitted by the data acquisition and transmission device, decrypts and decompresses the received data, stores the data into the database server, can detect whether the data are normal or not at regular time, and gives an alarm to prompt when the data are abnormal to wait for an operator to process the data. The operation terminal can access the database server through the network, and monitoring personnel can check the data through the operation terminal to generate a data report.

The remote monitoring center analyzes the received data to realize the monitoring function of the power grid condition. By installing detection devices on the power cables on two sides of the transformer in a segmented manner, the problems of undervoltage, overvoltage, overcurrent and the like can be found in time by monitoring parameters such as voltage, current, interphase balance and the like in real time, and the device can be quickly positioned in a certain section of power grid after the power grid fails, so that the efficiency is improved for removing the failure; alarm points may also be set, such as when the voltage is above or below a threshold. Meanwhile, the detection device which is simultaneously arranged on the incoming line and the outgoing line of the transformer can quickly detect the conversion efficiency of the transformer, timely replace the aging and fault transformer, avoid the waste of electric energy and achieve the purposes of energy conservation and emission reduction.

The specific installation and use method of the high-voltage power cable fault detection system comprises the following steps:

(1) selecting the installation position of the detection node: a plurality of detection nodes can be simultaneously arranged on the power cable at the high-voltage side of the transformer and the power cable at the low-voltage side of the transformer;

(2) setting a data acquisition device, registering the ID of the installed detection node into the equipment, establishing connection with a remote monitoring center, and performing operations such as registration and the like;

(3) setting a remote monitoring center, and inputting information such as user information, ID of a data acquisition device, ID of a detection node connected to the equipment and the like;

(4) after the system is started, the data acquisition device sends detection data to the remote monitoring center to realize the monitoring function.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A high-voltage power cable fault detection system is characterized by comprising a plurality of detection devices, a plurality of data acquisition devices, a remote monitoring center and a control center, wherein the detection devices are distributed on a power cable between a high-voltage line and a transformer; the detection device comprises a Hall sensor, a signal conditioning circuit, an A/D conversion circuit, a microprocessor and a communication interface which are connected in sequence; the detection device is in communication connection with a data acquisition device, and the data acquisition device is in communication connection with a remote monitoring center; and the communication interface of the detection device sends the encrypted data to the data acquisition device through the short-distance wireless network, the RS-485 serial bus or the optical fiber communication interface module.

2. The system according to claim 1, wherein the data acquisition device comprises a processor, and a display device, a communication interface and an alarm connected with the processor.

3. The system according to claim 1, wherein the remote monitoring center comprises a data processing server, a database server and an operation terminal.