An Online Monitoring Method of Transformer Winding Status Based on Cluster Analysis

A transformer winding, cluster analysis technology, applied in the direction of electrical winding testing, instruments, etc.

CN108919041BActive Publication Date: 2021-08-20GUIZHOU POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-20

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Abstract

The invention discloses a method for on-line monitoring of the state of transformer windings based on cluster analysis, which comprises: collecting vibration signals of the transformer box wall, and standardizing the collected vibration signals; intercepting the normalized processed vibration signals to obtain m groups of vibration signals; perform cluster analysis on the m groups of vibration signals of the transformer to obtain the transformer vibration characteristic curve; the calculation cluster is C t (k) Various types of vibration signals in the transformer vibration characteristic curve Z t The rate of change of the curve Y ci The root mean square value, and the average value of the root mean square value is Y cm ;Calculate the vibration curve y′ of the transformer to be detected c Relative to the transformer vibration characteristic curve Z t The rate of change of the curve Y' c The mean square value Y' of cm ; put Y' cm with Y cm To compare, Y' cm ≤Y cm Then it is judged that the transformer winding is running normally; Y′ cm >Y cm Then the transformer winding is loose or deformed; this method can effectively and highly sensitively monitor the looseness and deformation of the transformer winding on-line.
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Description

technical field

[0001] The invention relates to a transformer signal monitoring method, in particular to an online transformer winding state monitoring method based on cluster analysis. Background technique

[0002] Transformer is one of the most important equipment in the power system, and the stability of its operation has a great influence on the safety of the power system. With the increasing capacity of my country's power grid, the short-circuit capacity is also increasing, and the huge electromagnetic force generated by the surge current formed by the short-circuit at the outlet of the transformer poses a serious threat to the mechanical strength of the winding. After a transformer suffers a sudden short circuit, its winding may be loose or slightly deformed first, and the deformation of the transformer winding has a cumulative effect. Correspondingly, if the looseness or deformation cannot be detected and repaired in time, the short-circuit resistance capability of t...

Examples

Embodiment Construction

[0036] The invention provides a method for on-line monitoring of transformer winding state based on cluster analysis, which includes

[0037] (1) Collect the vibration signal x(t) of the transformer box wall, and standardize the vibration signal x(t). The calculation formula of the normalized processing of the vibration signal is

[0038]

[0039] In the formula, is the average value of the vibration signal x(t); N is the length of the vibration signal x(t); y(t) is the normalized vibration signal.

[0040] (2) Intercept the vibration signal after normalization processing, wherein, the intercept interval is Δt, and the intercept length is N 1 , taking the lowest point of the vibration signal as the starting point of each group of vibration signals to obtain m groups of vibration signals.

[0041] (3) Carry out cluster analysis on the m groups of vibration signals of the transformer to obtain the transformer vibration characteristic curve. Specific steps are as follows:...