Fault finding of the hottest transmission line

2022-08-15
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Transmission line fault finding

in order to improve the accurate location of faults, most of the 110kV and above substations are equipped with power system fault dynamic recording devices, namely fault recorders. The setting value of fault recorder requires that its ranging error is not greater than 5, (or 2km) and there is no phase determination error, and it can accurately record the voltage and current before and after the fault, which provides detailed first-hand information for fault inspection. The accuracy of the data provided by the device depends on the following four aspects: ① whether the wiring of the device conforms to GB, ISO, BS, ASTM, DIN, JIS, cen, en and other domestic and foreign standards is correct; ② Whether the setting value of the device is accurate or not depends on the measurement of line parameters, the calculation of the setting value and the setting of the setting value; ③ Whether the phase check has been carried out again after the transformation of the line, and whether the line parameters have been measured, calculated and set. ④ Whether to conduct accident analysis after line tripping, and check and adjust the fixed value of the device is the key to whether the device can be accurately positioned in the future

110kv and above lines are mostly equipped with microcomputer protection. Although the accuracy and fault quantity of fault data of microcomputer protection device are not required, nor provided by fault recorder, as long as accurate setting value calculation and setting are carried out according to line parameters, its ranging and positioning data is also a very important reference

the protection and automatic device only measured the distance from the substation to the fault point, which created huge economic benefits for fertilizer enterprises and farmers, and did not give the fault pole number. Therefore, we need to do some work on the road account to calculate the distance between each tower and the substations on both sides. Only in this way can we realize the rapid and accurate location of line fault points

most of the faults of transmission lines are single-phase faults. It is very important to understand the phase of the line. It is not practical for line patrol personnel to distinguish the fault phase only through the explanation before line patrol and the marking of tension poles and transposition poles. It is better to automatically dissolve and release the payload at each baseline and then make signs on the road pole number plate where necessary, which can reduce the workload of accident line patrol personnel by 2/3~1/2

some line faults are often evolved from defects, so it is also important to do a good job in the characterization and recording of defects

2 careful analysis is the key to fault location

after line failure, although the shorter the time to reach the fault point, the higher the success rate of fault detection. However, after receiving the dispatching order, we must not blindly patrol the line immediately. Instead, we should timely convene the necessary accident inspectors to make preparations for patrol inspection, and use a short time to collect and request accident data and conduct comprehensive and detailed fault analysis

first locate the fault on the road account. Ask the dispatcher for the fault location, phase, relevant voltage, current and protection action of the fault recorder or microcomputer protection when the line trips. According to the fault location data, the fault shall be fixed on the road account, and the fault interval shall be determined on the account according to the proportion of the device location error of 5~10 (generally 10). It shall also be partially corrected in combination with the experience data of previous line tripping

secondly, possible faults should be qualitative. This is very important and difficult. We need to flexibly use accident data analysis, rich experience in accident search, and grasp the accurate on-site situation, which should be collectively agreed. According to the action of the protection and automatic device and the reflected value of voltage and current before and after the fault, the fault outside the area or the fault of this line can be distinguished

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