Broken wire detecting method for voltage transformer

A voltage transformer and disconnection detection technology, which is applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problem of no applicable method for disconnection detection of voltage transformers, and achieves simplified disconnection detection methods, high reliability, Wide range of effects

Inactive Publication Date: 2004-06-23
SHANDONG KEHUI POWER AUTOMATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the method of voltage transformer disconnection detection is basically only for a specific type of wiring voltage transformer, and there is no method for voltage transformer disconnection detection suitable for various wiring methods

Method used

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  • Broken wire detecting method for voltage transformer
  • Broken wire detecting method for voltage transformer
  • Broken wire detecting method for voltage transformer

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Embodiment Construction

[0025] figure 1 , figure 2 The two wiring methods of voltage transformers (hereinafter referred to as PT) commonly used in railway automatic block power distribution are shown. The three-phase equivalent circuit of the PT secondary side is as follows: Figure 3 ~ Figure 6 As shown, there are 4 ways of Y-Y connection, Y-Δ connection, Δ-Y connection and Δ-Δ connection. Figure 7 , Figure 8 The normal working voltage vector diagrams of Y-connection and Δ-connection voltage transformers are respectively. The following are the amplitude characteristics of the line voltage of the PTs in the four connection modes when the line is broken.

[0026] a. Three-phase disconnection: When all three phases of PT are disconnected, theoretically U ab , U bc , U ca The amplitude of the voltage is zero, and the engineering generally takes the voltage amplitude to be less than 15-30% U e That is to say, there is no pressure.

[0027] b. Two-phase disconnection

[0028] (1) Y-Y type con...

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Abstract

The broken wire detecting method for voltage transformer is suitable for small current earthing system in power network. The detecting method includes the following steps: acquiring voltage signal from the voltage transformer and calculating to obtain line voltages Uab, Ubc and Uca; acquiring load current signal from the voltage transformer; comparing the voltage and current amplitudes to judge whether to exist broken wire based on whether the maximum line voltage amplitude (ULmin) is greater than or equal to 1.5 times the minimum line voltage amplitude (ULmin). The said method is suitable for the broken wire detection in voltage transformer of various junction mode, especially of Y-Y type and Delta-Delta junction mode.

Description

technical field [0001] The invention relates to a disconnection detection method of a voltage transformer in a small current grounding system of a power network, in particular to a detection method for a disconnection of a voltage transformer of a Y-Y type and a Δ-Δ type connection. Background technique [0002] The task of the voltage transformer is to accurately transform the very high voltage to the allowable voltage of the secondary protection and the secondary instrument (generally 100V), so that the relay and the instrument can work under low voltage and accurately reflect the power Operation of high-voltage equipment in the system. [0003] There are many wiring methods for voltage transformers, and sometimes there are voltage transformers with multiple wiring methods in the same substation. Potential transformer disconnection is one of the more common faults. When a potential transformer disconnection fault occurs, the corresponding protection and automatic device ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R35/02
Inventor 张怿宁陈平徐丙垠索南加乐
Owner SHANDONG KEHUI POWER AUTOMATION
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