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Test wiring circuit for line parameter measurement and measurement method of circuit

A technology for testing wiring and line parameters, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, and measuring devices. It can solve problems such as low test efficiency, insufficient flexibility, and large volume of different-frequency power supplies, and achieve high flexibility. , Small size, high test efficiency

Active Publication Date: 2015-07-29
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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

Method used

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  • Test wiring circuit for line parameter measurement and measurement method of circuit

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Embodiment 1

[0034] 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.

[0035] 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

[0045] 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.

[0046] 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 test wiring circuit for line parameter measurement and a measurement method of the circuit, solves the technical problems that a three-phase different-frequency power supply used in a present measurement manner is large in size, insufficient in flexibility and low in test efficiency, and is especially suitable for measuring parameters of power transmission lines of the electrical network. A single-phase different-frequency power supply serves as an external power supply, voltage transformers PT1, PT2 and PT3, heavy-current transformers CT1, CT2 and CT3, mini-current transformers CT4, CT5 and CT6 and 12 AC contactors K1 to K12 form a circuit structure, and under external logic control, the 12 contactors can complete all test wire switching required by the test process without manual intervention.

Description

technical field [0001] 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 [0002] 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 measurement. The general method of measuring line parameters by field test is to inject current into the three-phase line thr...

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 贾旭
Owner STATE GRID SHANDONG ELECTRIC POWER