A method for monitoring electrical variables for operation of a ring main unit

By constructing the equivalent circuit state equation of the three-phase circuit and using vector decomposition technology, the voltage components are separated, solving the problem of identifying early contact defects in ring main units and realizing accurate fault monitoring in complex power grid environments.

CN121710535BActive Publication Date: 2026-05-29DIKAI (FUJIAN) POWER COMPLETE EQUIP CO LTD
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Patent Information

Application Number
CN202610198341.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-11
Publication Date
2026-05-29
Estimated Expiration
2046-02-11

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately identify early contact defects in ring main units, especially under three-phase electromagnetic coupling interference, leading to misjudgments and difficulties in identifying early faults.

Method used

By constructing circuit state equations based on the equivalent circuit parameters of a three-phase circuit, calculating the reference voltage value and performing vector decomposition, resistive temperature drift and nonlinear impedance voltage components are separated. The contact state is determined by utilizing the dynamic response characteristics of the nonlinear impedance voltage components. Combined with time-domain envelope analysis and parameter correction, the monitoring of the contact interface is realized.

Benefits of technology

In complex power grid environments, it has achieved accurate identification of early latent faults in ring main units, stripped away external interference signals, overcomes the masking effect of traditional methods, and provides clear criteria for fault attribute discrimination.

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Abstract

The application relates to the technical field of power distribution network automation, and discloses an electric variable monitoring method for the operation of a ring network cabinet, which comprises the following steps: in response to a load current change rate exceeding a preset micro-motion excitation threshold, acquiring three-phase electric variable data; calculating a reference voltage based on a circuit state equation containing a mutual inductance coupling term; constructing a rotating coordinate system with a current vector as a reference axis, performing vector decomposition on a voltage deviation vector, separating out a resistive temperature drift voltage component parallel to the reference axis, and taking a nonlinear impedance voltage component perpendicular to the reference axis as a monitoring parameter to determine a contact state; through a vector orthogonal decomposition mechanism, the application effectively decouples linear resistance drift caused by conductor temperature rise, eliminates baseline interference, can capture weak nonlinear impedance distortion characteristics caused by mechanical contact deterioration, and improves the identification sensitivity and accuracy of early latent faults of the ring network cabinet.
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