On-load tap-changer gear detection device and on-load tap-changer gear judgment system

Abstract

The invention provides an on-load tap-changer gear detection device and an on-load tap-changer gear judgment system. The judgment system comprises a detection device and a processing device. The detection device comprises a main shaft, a shaft sleeve, a central disc, a gear disc, a preselection disc and a sliding gear disc. The gear disc, the preselection disc and the sliding gear disc are all arranged on the periphery of the central disc, and the gear disc, the preselection disc and the sliding gear disc are all located on the same horizontal plane with the central disc. The processing device is connected with the detection device, the current gear of the on-load tap-changer is analyzed through the gear disc, the processing device analyzes whether the gear of the on-load tap-changer is changed into a shift-up gear or a shift-down gear through the preselection disc, and the processing device analyzes whether the on-load tap-changer slides or not through the sliding gear disc. According to the on-load tap-changer gear detection device and the on-load tap-changer gear judgment system, the current gear and the preselected gear of the on-load tap-changer are analyzed, sliding gear judgment is carried out, the reliability of an extra-high voltage converter transformer OLTC is improved, and then stable and reliable operation of the extra-high voltage converter transformer is improved.

Description

technical field [0001] The present application belongs to the field of transformer equipment, and in particular, relates to a gear position detection device and a discrimination system of an on-load tap changer. Background technique [0002] On-load tap-changer (ON-LOAD TAP-CHANGE, referred to as OLTC) is a voltage regulating device used to change the tap connection position of the transformer winding. The OLTC operates under transformer excitation or load conditions. The basic principle of OLTC is to switch between taps in the transformer winding without interrupting the transformer load current, thereby changing the number of turns of the winding, and finally realizing the purpose of voltage regulation. [0003] However, the applicant found that when the OLTC is applied in the UHV converter transformer, there are the following problems. [0004] 1. The long-term full-load high-voltage operation of the UHV converter transformer makes the current flowing through the OLTC l...

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Problems solved by technology

[0005] 2. The load current flowing through the on-load tap-changer of the UHV converter transformer is not a sine wave, but a current waveform with a commutation process, which makes the di / dt at the zero crossing point large and makes it difficult to extinguish the arc

[0006] 3. The OLTC in the UHV converter transformer operates frequently, and the number of operations can reach 4000 times per year, which requires high mechanical performance of the OLTC

[0007] 4. The internal operation of the OLTC does not have any electrical quantity detection, and it is in a "black box" state during operation, and it is impossible to judge the transient working state during the switching process

[0008] 5. At present, the OLTCs used in the UHV DC transmission projects used in my country are all provided by foreign manufacturers, and accident analysis and improvement cannot be independently controlled

When the electric mechanism judges the gear position of the electric mechanism and whether it is slipping through the number of turns of the driving motor, if any link of the multi-link mechanical transmission rod is abnormal, the driving motor will rotate and the on-load tap-changer will fail. The mechanism does not rotate, resulting in an error in the transmission of gears

[0012] 2. The gear position information of the electric mechanism is sent through the relay. In the UHV converter transformer, the number of transformer gear adjustments is numerous.

High-frequency operations are likely to damage the relay, causing the relay to fail to send gear information normally

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