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  • Inspection and identification methods for transformer on-load tap changer (OLTC) faults

    According to statistics, the faults of the on-load voltage regulating switch of the transformer mainly include two aspects: First, the failure of the voltage regulating switch driving mechanism, mainly including the linkage of the electric mechanism, water intrusion into the box, oil leakage from the gear box, insufficient spring energy storage, etc. The second is the failure of the switch body, which mainly includes oil leakage from the oil chamber, loose fasteners, stuck contact motion, and poor contact caused by contact wear. The common fault types of on-load voltage regulating switches are listed and analyzed below.

  • Multiple methods for troubleshooting power equipment faults

    In daily use, power equipment is sometimes prone to malfunctions, so analyzing the phenomenon and promptly identifying the cause of the malfunction is the key to identifying power faults. The basic theory of electricians is the foundation of analysis, which combines a full understanding of the structure, principle, and performance of power devices with practical faults.

  • Evaluation of the voltage withstand capability of electrical equipment insulation.

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  • The transformer short-circuit impedance tester can perform precise measurements

    The transformer short-circuit impedance tester is a high-precision instrument used for measuring the no-load, load parameters, and zero sequence impedance parameters of transformers. It can accurately measure a series of parameters such as no-load current, no-load loss, short-circuit loss, impedance voltage, harmonic content, distortion rate, etc. of various transformers. It has the advantages of small size, light weight, high measurement accuracy, good stability, and easy operation and learning, which can replace the previous method of using multiple meters to measure transformer losses and capacity.

  • What current is generally selected for a transformer DC resistance tester?

    ​The DC resistance test of transformer windings is an indispensable test item for transformers after handover, overhaul, and change of tap changer. Under normal circumstances, measuring the DC resistance of transformer windings and high-power inductive equipment using traditional methods is a time-consuming and labor-intensive task. To change this situation, shorten measurement time, and reduce the workload of testers, a transformer DC resistance tester can be used.

  • What is the open circuit voltage test?

    ​A measurement method called the open circuit voltage test is used to find the voltage that a transformer produces across its terminals when there is no load on it. There is no electricity flowing through the transformer during this test since the secondary winding is left open. Next, a voltage source equal to the transformer's rated voltage energizes the primary winding.

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