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A method for measuring impedance and inductive resistance of lines

A technology for measuring lines and lines, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc. Small size and high test efficiency

Active Publication Date: 2016-06-22
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention lies in the problems that the existing measurement methods use different-frequency power supplies with large volume, insufficient flexibility and low test efficiency, thus proposing a test wiring circuit for line parameter measurement and its measurement method

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  • A method for measuring impedance and inductive resistance of lines

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Embodiment 1

[0035] This embodiment provides a test wiring circuit for line parameter measurement, such as figure 1 As shown in the figure, in the dotted line frame is the test wiring circuit of the present invention, wherein A, B, C represent the lead-in ends of the three-phase overhead line, CT represents the current transformer, PT represents the voltage transformer, and K represents the contactor, Used as a controllable switch. AC means externally connected single-phase power supply with different frequency.

[0036] The test wiring circuit for line parameter measurement in this embodiment includes a single-phase variable-frequency power supply AC. The single-phase variable-frequency power supply has two output terminals, namely a first terminal and a second terminal, which output AC power. The first end of the single-phase variable-frequency power supply is connected to the A-phase terminal of the line to be tested through the current transformer CT1 and the controllable switch K1; t...

Embodiment 2

[0046] This embodiment provides a method for measuring line parameters of a test wiring circuit. The single-phase different-frequency power supply is used to measure each component of the line parameter through sub-sections, and then the method of synthesizing each component can also be obtained theoretically. Equivalent measurement accuracy. The invention utilizes the control of the contactor in the test wiring controller, and the test wiring controller can use a high-speed single-chip microcomputer or a DSP output relay logic action to automatically complete the switching of the test wiring, thereby realizing automatic sub-measurement without any manual intervention.

[0047] A method for testing the parameters of a three-phase overhead line using a single-phase different-frequency power supply is as follows: first, the A phase, B phase, and C phase at the opposite end of the line are short-circuited to ground, and the measurement of the line resistance and inductance is comp...

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Abstract

The invention provides a method for measuring impedance and inductive resistance of lines, and solves technical problems of a relatively large size, insufficient flexibility, low test efficiency of existing measurement which utilizes three-phase pilot-frequency power supplies. In the invention, a single-phase pilot-frequency power supply is used as an external power supply, and meanwhile, a voltage transformer P1, a voltage transformer P2, a voltage transformer P3, a large current transformer Ct1, a large current transformer Ct2, a large current transformer Ct3, a small micro current transformer CT4, a small micro current transformer CT5, a small micro current transformer CT6 and twelve AC contactors K1-K12 together form a circuit structure. The twelve AC contactors can complete test wiring switching required by a whole test process without artificial intervention under external logic control.

Description

[0001] This application is a divisional application of 201510139743.1, and the filing date of the parent case is 2015-03-27. technical field [0002] The invention belongs to the technical field of power measurement, in particular to a test wiring circuit for line parameter measurement and a measurement method thereof. Background technique [0003] Transmission lines are an important part of the power system. With the rapid development of the power grid, there are more and more new high-voltage transmission lines. The parameters of the lines need to be measured to calculate the short-circuit current of the system, set the relay protection, calculate the power flow distribution and select the operation mode. etc. basis. The transmission line parameters can be obtained through theoretical calculations or field tests. However, due to the calculation deviation caused by various assumptions in the theoretical calculation, the theoretical calculation cannot replace the field test...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/04G01R27/02
CPCG01R1/04G01R27/02
Inventor 刘鹏孙昭昌吴寿山谭波尹玉娟雷敏程谋铨
Owner STATE GRID SHANDONG ELECTRIC POWER