A simulation and diagnosis method and system for transition resistance faults of on-load tap-changers
A fault diagnosis system and transition resistance technology, applied in circuit breaker testing, measuring electricity, measuring electrical variables, etc., can solve the problems of test waveform distortion, error, complex tap changer site, etc., and achieve the effect of strong engineering applicability
Active Publication Date: 2021-06-25
JIANGSU ELECTRIC POWER CO +2
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Problems solved by technology
[0005] The traditional transition resistance fault detection generally tests the switching waveform of the on-load tap changer and compares it with the standard waveform to diagnose the transition resistance fault. However, due to the complexity of the tap changer site, the obtained test waveform is seriously distorted. , there is a certain error compared with the standard waveform
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[0101] The present invention through the figure 1 The transition process of the tap changer shown is simulated, so as to provide a diagnosis and simulation method for the transition resistance fault of the on-load tap changer, as shown in the attached image 3 As shown, the diagnosis and simulation method of the on-load tap changer transition resistance fault disclosed by the present invention include the following steps:
[0102] Step 1: Build a single-phase on-load tap changer transformer model in the Simulink environment in matlab for the simulation analysis of the subsequent tap changer switching process;
[0103] as attached figure 2 As shown, the single-phase on-load tap changer transformer model includes: AC power supply 1, step-up transformer module 2, transformer primary side current acquisition unit 3, single-phase multi-winding transformer module 4, secondary side voltage acquisition unit 5, and current oscilloscope S1 , voltage oscilloscope S2, timing generator ...
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The application discloses a simulation and diagnosis method and system for an on-load tap-changer transition resistance fault, including: 1) building a single-phase on-load tap-changing transformer model under the Simulink environment in matlab, in order to prepare for the following tap-changer Simulation analysis of the switching process; 2) Set the parameters of each module of the on-load tap changer model; 3) Simulate the damage degree of the transition resistance of the tap changer respectively, and observe the change of the primary side current of the transformer; 4) Through the analysis The state of the transition resistance of the tap changer is identified by comparing the change of the primary side current of the transformer. It can be seen from the simulation analysis that the present application can achieve better results in diagnosing the transition resistance.
Description
technical field [0001] The invention belongs to the technical field of transformer detection, and relates to a transformer on-load tap changer transition resistance fault diagnosis technology, in particular to a simulation and diagnosis method and system for an on-load tap changer transition resistance fault. Background technique [0002] As one of the core components of the transformer, the transformer on-load tap changer OLTC plays an important role in stabilizing the load center voltage, adjusting the reactive power flow, and increasing the flexibility of power grid dispatching in the power system. [0003] As an online dynamic device, the on-load tap-changer is in the working state of frequent load voltage regulation. Although it usually has a mechanical life of hundreds of thousands of operations, it is affected by the material, process and load. The proportion in the total transformer accident is relatively high. Hanging core inspection is the most direct method to fi...
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IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 陈冰冰张勇司小庆王梁徐艳徐礼浩高沁马宏忠王春宁许洪华李杰王妍
Owner JIANGSU ELECTRIC POWER CO