A Scale Model Based Impulse Withstand Voltage Test Method for UHV Converter Transformers

A technology of converter transformer and scaled model, applied in the direction of testing dielectric strength, etc., can solve the problems of complex manufacturing process, high voltage level and high difficulty, and achieve the effect of convenient test and debugging, low voltage level and shortened cycle.

Active Publication Date: 2016-12-07
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

UHV converter transformers have a high level of technology, complex manufacturing processes, and high voltage levels. It is difficult to conduct on-site tests, and only the entrance voltage waveform and neutral point current waveform can be obtained. It is difficult to find out the specific reasons once a problem occurs, and it is necessary to study the key technology of the test
[0004] However, if large-scale test equipment is used for research, the cost is high, and it is difficult to obtain the required relevant test data. Without relevant test data, it is difficult to improve the test technology

Method used

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  • A Scale Model Based Impulse Withstand Voltage Test Method for UHV Converter Transformers
  • A Scale Model Based Impulse Withstand Voltage Test Method for UHV Converter Transformers
  • A Scale Model Based Impulse Withstand Voltage Test Method for UHV Converter Transformers

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Embodiment Construction

[0021] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention.

[0022] figure 1 is the wiring diagram of the impulse withstand voltage test of the UHV converter transformer based on the scaled model, in which C 1 main capacitor, R 1 is the wavefront resistance, R 2 is the discharge resistance, R 3 is the sampling resistor. G is the spark gap, the main capacitor C 1 , spark gap G, wave front resistance R1 and discharge resistance R2 are connected in series in sequence, the nodes of wave front resistance R1 and discharge resistance R2 are grounded through a resistor divider, and the grid-side winding of the UHV converter transformer scaled model is connected with discharge resistance R2 Connected in parallel, the UHV converter transformer scale model is set to lead out taps connected to the measuring equipment, and the neutral point of the UHV converter transformer...

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Abstract

A scaled model-based UHV converter transformer impulse withstand voltage test method, according to the specific structure of the scaled model designed based on the scaled-down theory, conducts simulation research to obtain the distribution parameters of the scaled-down model windings, and determine the test waveform; according to the research needs , set the lead-out tap on the scaled model to obtain the required test waveform, and set related faults; make the actual equipment, use the scaled model to test, and adjust the parameters of the produced power equipment to obtain the required test waveform; Simplify the structure of the equipment and The test method is to obtain the winding voltage distribution waveform, and set the tap to set the corresponding fault for experimental research; through the analysis and research, the normal condition of the winding under the impulse voltage and the voltage distribution characteristics of the fault condition are obtained, and the UHV commutation is obtained by using the scaling relationship Transformer voltage distribution characteristics. The invention can simplify the test steps, reduce the test cost, shorten the test period, and can study the winding voltage distribution characteristics under different fault conditions.

Description

technical field [0001] The invention relates to the testing field of ultra-high voltage direct current transmission equipment, in particular to a method for testing the impulse withstand voltage of ultra-high voltage converter transformers based on a scaled model. Background technique [0002] In recent years, a number of UHVDC transmission lines have been completed and put into operation, and a number of UHVDC transmission lines are being planned. As one of the important equipments in the DC transmission project, the stability and reliability of the UHV converter transformer play a crucial role in the safe operation of the entire DC transmission system. [0003] Before being put into operation, according to the standard requirements, the UHV converter transformer must be subjected to an impact test on site. The technical level of UHV converter transformers is high, the manufacturing process is complex, the voltage level is high, and it is difficult to carry out on-site tes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 阮羚贺家慧谢齐家周友斌汪涛邓万婷高得力
Owner STATE GRID CORP OF CHINA
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