Distributed fault monitoring device for the hottes

2022-08-06
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Transmission line distributed fault monitoring device

the transmission line distributed fault monitoring device is used for transmission line insulation abnormal early warning, accurate fault location and fault identification, accurately recording the number and location of lightning strikes on the line, and accumulating lightning strike characteristic parameters, which provides a strong basis for the power department to accurately evaluate the safety level of line surface bonding strength at the user's site for equipment acceptance

the system is composed of intelligent monitoring device and background analysis system. The monitoring device is installed on the transmission line conductor to accurately capture the traveling wave signals generated by the line insulator discharge (the peak and peak of discharge pulse current is greater than 0.8A current), lightning stroke, line short circuit, line grounding, etc. through the double terminal or multi terminal positioning principle, the discharge point or fault point is determined, the fault location is reliable, and the fault report is automatically popped up. Using the linear correlation between fault distance and time, the constant speed tensile testing machine is used to eliminate the error caused by the change of traveling wave transmission speed and line length on the calculation of fault distance. The fault location accuracy is less than 300 meters, which solves the problems of transmission line (including cross regional lines) vulnerability and difficulty in finding fault points

composition of monitoring system:

the monitoring system consists of background analysis system and intelligent monitoring device

background analysis system: collect the fault transient traveling wave and power frequency current information collected by the intelligent monitoring device, analyze and calculate the fault location, automatically pop up the fault location results, identify the fault type, automatically generate the fault report and send it to the customer. At the same time, the background analysis system has the functions of parameter setting, event query, event statistics, data analysis, expert system, etc

intelligent monitoring device: it is mainly composed of traveling wave signal detection and sensing module, CT power supply module, traveling wave signal acquisition and processing module, clock module (GPS) and communication module (GPRS)

monitoring system function:

1. Monitoring range

the system is applicable to the continuous transformation of research results into interval positioning and accurate positioning of tripping faults and lightning stroke faults of 35kV and above power lines of various voltage levels

2. Fault recording

can collect traveling wave current waveforms of different fault types, such as lightning strike, mountain fire, short circuit and other fault current waveforms

3. Fault location

after a fault occurs, the fault section will be given by the fault recording function of the distributed monitoring terminal

accurately locate the fault point according to the traveling wave location method

4. Fault identification

according to the traveling wave current shape, the system will automatically identify lightning stroke fault and non lightning stroke fault

for lightning stroke fault, the system identifies the fault as lightning strike back fault or lightning bypass fault according to the difference of traveling wave current waveform

5. Fault alarm

after a fault occurs, the system will provide the diagnosis results to the user through SMS, web publishing and other means to realize the fault alarm

monitoring system features:

1. Multiple fault traveling wave acquisition methods are integrated, with high reliability.

hardware extraction wave signal method and fault recording wave acquisition signal method are integrated to improve the acquisition reliability of fault traveling wave. The monitoring terminal has high reliability and maintenance free time of up to 5 years. The protection grade shall reach IP65 and shall not be affected by long-term outdoor exposure; It adopts multi-layer shielding design and has strong anti electromagnetic interference ability

2. The combination of fault location and high positioning accuracy

integrates the characteristics of traveling wave and power frequency current information to achieve fault zoning, and uses hardware wave data and recording data to accurately locate faults. The traveling wave accurate location of fault point in a small interval can reduce the error caused by waveform attenuation and line vertical isolation

3. Network fault location, strong redundancy

using the transmission line network fault location method, multiple intelligent devices' fault location fusion correction, redundancy mutual calibration, strong redundancy of fault location. The monitoring terminal directly extracts fault traveling wave signal and fault power frequency current signal from the conductor, and the monitoring points can be flexibly set according to different line lengths, branches and dividing points

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