Distributed fault location and hidden danger monitoring device for transmission lines
model：DX-WPS100-GZ01
1、 Demand analysis
With the increasing number of high-voltage long-distance overhead transmission lines, transmission lines, as the link of energy transmission, are the basis for the safe and stable operation of the whole system; Once a fault occurs on the transmission line, it is necessary to find the fault point as soon as possible, eliminate the fault and restore power supply. However, as high-voltage and ultra-high voltage transmission lines are often exposed to different environments and distributed in a wide geographical area, the operating environment is harsh; Therefore, it is also a place where many faults occur in the power system. It is very important to quickly and accurately find the fault point after the line fault, not only for timely repair of the line and rapid restoration of power supply, but also for the security, stability and economic operation of the entire power system.
2、 Working principle
The distributed fault location and hidden danger monitoring device for transmission lines adopts the distributed traveling wave measurement technology. The monitoring terminals are distributed on the transmission line conductors. The power frequency fault signals and traveling wave fault signals near the line fault time point are collected at high potential and sent back to the background data center in 4G/5G wireless ways. Through the comprehensive analysis of the data center, the fault point can be quickly and accurately determined according to different fault characteristics, Improve fault location accuracy to improve fault line patrol efficiency, and also capture transient fault traveling wave waveform to intelligently identify whether the fault is a lightning strike fault or a non lightning strike fault, and whether the lightning strike fault is a shielding strike or a counterattack. The diagnosis results are displayed in two ways: web and SMS, and sent to users, which is helpful to timely repair the fault line and ensure the safe and stable operation of the whole power grid.
3、 Product Functions
(1) Basic configuration of fault location monitoring: main control unit, fault location monitoring unit, communication unit, inductive power supply unit, solar power supply unit, mounting bracket and auxiliary materials.
(2) Detection and calculation of fault distance: it can accurately detect and record the distance of single-phase ground fault, interphase short circuit fault, open circuit fault and instantaneous fault of the line online;
(3) High precision fault location: it can accurately determine the fault section of transmission line, and the reliability of section location is more than 99%;
(4) The error is not more than 300 meters: it can accurately determine the fault location of the transmission line, and the location error is 300 meters
(5) Fault cause identification function: it can identify lightning strike fault and non lightning strike fault, and the accuracy of lightning strike and non lightning strike fault identification is more than 95%;
(6) High identification accuracy: it can identify shielding failure and counterattack failure, and the identification accuracy of lightning strike fault nature is more than 90%
(7) Dual RAM recording technology: dual RAM recording technology is adopted to eliminate the "dead zone of recording" of transient signals and prevent the omission of fault data caused by lightning current interference;
(8) It can record line lightning current, locate lightning strike points and count lightning strike times online;
(9) It can detect line load current online, including timing return and call to measure load current data;
(10) The software has the functions of automatic fault identification, output alarm and data file storage;
(11) 4G/5G wireless transmission: 4G/5G network encryption transmission, measurement;
(12) Support remote upgrade: support remote parameter setting and program upgrade
4、 Technical parameters
Serial No | category | project | technical parameter |
1 | Overall performance | Complete machine configuration | Main control unit, fault location monitoring unit, communication unit, inductive power supply unit, solar power supply unit and installation auxiliary materials. |
2 | Overall quality | Less than 15KG | |
3 | texture of material | Aluminum mold body | |
4 | Fault location monitoring unit | Fault location sensor | Interval positioning reliability ≥ 99%; Positioning error ≤ 100m |
5 | Detect line length | 30km | |
6 | Traveling wave sensor broadband | 1kHz～2MHz | |
7 | Traveling wave sampling rate | ≥5MHz | |
8 | Single conductor fault current measurement range | 10A～15000A(Valid value) | |
9 | Continuous recording duration of traveling wave current | ≥1000μs | |
10 | Communication unit | communication mode | All Netcom 4G/5G/WIFI wireless transmission |
11 | Data security | VPN dedicated channel can be used for communication with the master station, and encryption transmission is optional. | |
12 | Access protocol | Access to monitoring platforms of provincial power companies such as Southern Power Grid and State Grid | |
13 | Power supply unit | Power supply mode | The normal working current range of induction power supply and solar power supply is 30~1000A; |
14 | Power supply duration | The power supply requirement that the device can operate normally for 30 days without continuous illumination. | |
15 | Other parameters | work environment | Working temperature: - 40~+70 ℃; Relative humidity: 5-99% RH |
16 | Overall service life | More than 8 years | |
17 | Degree of protection | IP67 |
