A method for fault distance measurement of T-connection line

A technology of fault distance measurement and line connection, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement. It can solve problems such as complex principles, difficult engineering, and small amount of calculation.

Active Publication Date: 2021-09-10
NARI TECH CO LTD +2
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Problems solved by technology

For the T-connection line fault location algorithm, some traveling wave methods and wave impedance methods are currently being studied. Generally, the calculation amount of the algorithm is large or the principle is complicated, and the engineering is difficult.
In an adaptive fault location method applied to T-connected lines, Yao Liang et al. proposed a method of using T-point compensation voltage to identify the fault branch and then using a single-ended fault location algorithm to determine the fault point. The principle is simple and the amount of calculation is small. It is suitable for engineering, but the ranging result of this method is greatly affected by the transition resistance, and the selection result is heavily dependent on the three-terminal synchronization data

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  • A method for fault distance measurement of T-connection line
  • A method for fault distance measurement of T-connection line
  • A method for fault distance measurement of T-connection line

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Embodiment

[0071] established as Figure 4 The RTDS simulation model shown, the model parameters are shown in Table 1:

[0072] Table 1 Model parameters

[0073] project parameter unit Positive sequence resistance 0.147 Ω / km Positive sequence reactance 0.430 Ω / km Positive sequence parallel capacitive reactance 0.530 MΩ*km Zero sequence resistance 0.500 Ω / km Zero sequence inductive reactance 1.200 Ω / km Zero sequence parallel capacitive reactance 0.786 MΩ*km Line length MT (zone 1) 20 km Line length NT (Zone 2) 30 km Line length PT (Zone 3) 40 km

[0074] If the simulated fault point K1 is 50% away from the M side, the theoretical T point distance measurement result is 20*0.5=10kM; the simulated fault point K2 is 50% away from the N side fault, and the theoretical T point distance measurement result is 30*0.5=15kM; simulated fault The point K3 is 30% away from the fault on the P side, and the theoret...

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Abstract

The invention discloses a T-connection line fault distance measurement method, comprising: when the optical fiber channel is normal, using T-point compensation voltage to identify the faulty branch; when the optical fiber channel is abnormal, using the three-terminal fault distance measurement result to identify the faulty branch ; Then, according to the relationship between the minimum value of the fault current and the set maximum fault current threshold value, determine the three-terminal fault removal time; The distance from point T. The invention is used in the existing line protection device. For the T-connection line, the distance can still be measured normally when the communication of the longitudinal channel is abnormal, and the distance measurement accuracy can be guaranteed especially when the single-phase high-resistance grounding fault occurs.

Description

technical field [0001] The invention relates to a T-connection line fault ranging method, which belongs to the technical field of electric power system relay protection. Background technique [0002] At present, there are two main types of fault location algorithms applied to transmission lines: single-end location algorithm and double-end location algorithm. For the double-ended ranging algorithm, it is only applicable to the double-ended system. For the T-connection line (three-terminal system), the principle of the double-ended ranging algorithm is no longer applicable; for the single-ended fault ranging algorithm, the general metallic fault only has one end The distance of the line can be accurately measured, but the results of fault distance measurement at the other two ends are inaccurate due to the existence of shunt branches. For T-connection line fault location algorithms, some traveling wave methods and wave impedance methods are currently being studied. Generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 余洪吴通华王小红郑玉平姚刚纪浩然梁臣戴魏孙良凯杨平怡
Owner NARI TECH CO LTD
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