On-load tap-changer diagnosis method and device

A technology of on-load tap-changing and switching, which is applied in the direction of measuring devices, measuring vibrations, instruments, etc., and can solve the problems of low accuracy of fault identification

Inactive Publication Date: 2017-10-20
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low accuracy in ident...

Method used

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  • On-load tap-changer diagnosis method and device
  • On-load tap-changer diagnosis method and device
  • On-load tap-changer diagnosis method and device

Examples

Experimental program
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Embodiment 1

[0034] An embodiment of the present invention provides a method for constructing a diagnostic model of an on-load tap changer, figure 1 is a flowchart of a method for constructing an on-load tap-changer diagnostic model according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0035] Step S101, acquiring the first vibration signal when the switch is in a preset fault state and the second vibration signal when the switch is in a normal working state, the preset fault state includes power failure and mechanical failure of the on-load tap changer, mechanical failure Faults mainly include: fracture of drive shaft, poor contact between selector switch contacts, refusal to move and slipping phenomenon caused by failure of operating mechanism, failure of limit switch, refusal to cut, stop or action lag of diverter switch, loosening and falling off of internal fasteners , and internal leakage, etc., the present inventio...

Embodiment 2

[0057] This embodiment provides a method for diagnosing an on-load tap changer, Figure 4 It is a flowchart of a method for diagnosing an on-load tap changer according to an embodiment of the present invention, such as Figure 4 As shown, the process includes the following steps:

[0058] Step S401, acquiring a vibration signal of the switch, and collecting the vibration signal through a vibration sensor.

[0059]Step S402, decompose the vibration signal to obtain the coefficients of each scale of the vibration signal. The coefficients of each scale include high-frequency part coefficients and low-frequency part coefficients. For example, the mechanical vibration signal can be decomposed by wavelet packets, which not only The low-frequency part of the signal is decomposed, and the high-frequency part is also decomposed, which helps to understand the characteristics of the signal details.

[0060] Step S403, comparing the coefficients of the low-frequency part with a set thre...

Embodiment 3

[0085] This embodiment provides a device for constructing a diagnostic model of an on-load tap changer, which is used to implement the above embodiments and preferred implementation modes, and those that have already been described will not be repeated. As used below, the term "module" may be a combination of software and / or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

[0086] Figure 6 is a structural block diagram of a construction device for an on-load tap-changer diagnostic model according to an embodiment of the present invention, such as Figure 6 As shown, the device includes: an acquisition module 61, which is used to acquire the first vibration signal when the switch is in a preset fault state and the second vibration signal when the switch is in a normal wor...

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Abstract

The invention provides an on-load tap-changer diagnosis method and device. The method comprises steps that a vibration signal of a switch is acquired; the vibration signal is decomposed to acquire a coefficient of each scale of the vibration signal, and the coefficients comprise high frequency coefficients and low frequency coefficients; the low frequency coefficients are compared with a set threshold to acquire low frequency effective coefficients through screening; the low frequency effective coefficients and the high frequency coefficients are spliced, and an effective frequency band multi-resolution characteristic parameter is acquired through calculating a Mel-frequency cepstral coefficient; whether the switch is in fault is determined according to the effective frequency band multi-resolution characteristic parameter. The method is advantaged in that online monitoring and state evaluation are realized, and the specific hidden trouble can be more accurately discovered.

Description

technical field [0001] The invention relates to the field of state monitoring and fault diagnosis of power transmission and transformation equipment, in particular to a diagnosis method and device for an on-load tap changer. Background technique [0002] In recent years, on-load tap-changing transformers have been more and more widely used in power grids, and the faults of on-load tap-changers have also increased. Foreign statistics show that on load tap changer (OLTC) faults account for 41% of load tap changer faults, and are still on the rise; domestic average statistics show that OLTC faults account for 20% of transformer faults above. [0003] Generally speaking, mechanical faults are the main fault types of power transformer on-load tap-changers, mainly including: broken drive shaft, poor contact between selector switch contacts, refusal to move and slipping phenomenon caused by operating mechanism failure, limit switch failure , The diverter switch refuses to cut, st...

Claims

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Application Information

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IPC IPC(8): G01H1/14
CPCG01H1/14
Inventor 胡东贾亚军黄锐郑强王林峰阎振坤刘丰祯刘芮辰刘兆元
Owner STATE GRID SHANDONG ELECTRIC POWER
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