T-type connection transmission line power frequency positive-sequence impedance measurement method

A positive sequence impedance and measurement method technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as complex calculations

Active Publication Date: 2017-01-11
YUXI POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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Problems solved by technology

However, these calculations are complex and affected by many uncertain factors, including the geometric shape of the transmission line, current, ambient temperature, wind speed, soil resistivity, lightning protection line erection method and line path, etc. It is impossible to rely on theoretical calculations to obtain these parameters. exact value

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  • T-type connection transmission line power frequency positive-sequence impedance measurement method
  • T-type connection transmission line power frequency positive-sequence impedance measurement method
  • T-type connection transmission line power frequency positive-sequence impedance measurement method

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[0035] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] T-shaped transmission line is composed of the first branch, the second branch and the third branch connecting different substations, such as Figure 1a , 2a As shown in 3a, the three branches are respectively connected to A, B, and C substations. The power frequency positive sequence impedance measurement method of the T-connected transmission line of the present invention mainly includes data acquisition steps and data processing steps. Combine below Figure 1a-3b Introduce in detail the realization of data collection steps and data processing steps:

[0037] (a) Steps of data collection:

[0038] First, power off the T-shaped transmission line to be tested, and then execute the three operation modes in Table 1 in sequence, tha...

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Abstract

The invention discloses a T-type connection transmission line power frequency positive-sequence impedance measurement method. The T-type transmission line is composed of a first branch, a second branch and a third branch. The method comprises steps: (a) after the T-type transmission line is power-off, three measurement modes are executed sequentially, symmetrical three-phase power frequency voltage is applied to the front end of the first branch respectively in each measurement mode, and voltage signals and current signals of the T-type transmission line in each measurement mode can be acquired; and (b) corresponding power frequency positive-sequence voltage is analyzed from the voltage signals acquired in the step (a) and corresponding power frequency positive-sequence current is analyzed from the current signals, and the power frequency positive-sequence impedance parameters are calculated when circuit structure simultaneous equations in the three measurement modes are combined. The three measurement modes are easy to realize and are convenient and simple. Further, in the step (a), based on a GPS technology, signals of each branch of different substations at the same time can be acquired synchronously, and the measurement result accuracy is ensured; and further, in the case of analysis in the step (b), a Fourier and sequence decomposition method can be adopted, and the measurement precision is improved.

Description

Technical field [0001] The invention relates to the field of electric power systems, in particular to a method for measuring the power frequency positive sequence impedance of a T-connected transmission line. Background technique [0002] Transmission lines are one of the main components of the power system and the carrier of power transmission. They play a great role in the power system. The parameters of transmission lines mainly refer to their power frequency parameters, which include positive sequence impedance, zero sequence impedance, positive sequence capacitance, zero sequence capacitance, and coupling capacitance and mutual inductance impedance between multiple circuits. These parameters are mainly used for power system faults. Analysis, power flow calculation, short-circuit current calculation, relay protection setting calculation and selection of power system operation mode, etc. These line parameters are necessary parameters for establishing the mathematical model of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 刘雪锋禹海斌李阳斌杜文良王斌王红平卢昱磊李应新韩向关攀飞龚小胜李忠恒
Owner YUXI POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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