Test system and method for short-circuit bearing capability of distribution transformer

A distribution transformer and test system technology, applied in the field of electric power, can solve the problems of high voltage level at grid access points, great influence on grid power quality, insufficient test capacity, etc., to facilitate transportation and on-site placement, and improve test quality and efficiency , the effect of convenient operation

Active Publication Date: 2019-05-03
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test power supply is obtained by using the power grid dedicated line, which requires a large investment in equipment such as test transformers and regulating reactors, and the voltage level of the grid access point is high, which has a great impact on the power quality of the grid.
On the other hand, the production capacity of this test in China is insufficient, and the cost remains high

Method used

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  • Test system and method for short-circuit bearing capability of distribution transformer
  • Test system and method for short-circuit bearing capability of distribution transformer
  • Test system and method for short-circuit bearing capability of distribution transformer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0087] Select a 10kV distribution transformer, the product model is S9-30 / 10. Produced by Zhangjiakou Longyin Electric Co., Ltd. and put into operation in 2017. The product has been in operation so far, and has not experienced any major accidents. The operation is in good condition, and all factory tests and routine test indicators are at normal levels.

[0088] The test takes the form of short circuit on the low voltage side (short circuit first), pressurization on the high voltage side (pressurization later), and is carried out phase by phase according to the wiring of the single-phase test circuit.

[0089] Phase A short circuit test steps (take 30kVA as an example):

[0090] ① Under the minimum voltage tap, apply 30% of the rated short-circuit current, that is, 13.7A, for 0.5s, and conduct the test once;

[0091]② Under the minimum voltage tap, apply 50% of the rated short-circuit current, that is, 22.8A, for 0.5s, and conduct the test once;

[0092] ③ Under the minimum...

specific Embodiment approach 2

[0111] Select a 315kV distribution transformer, the product model is S11-M-315 / 10. Produced by Hebei Tongyu Transformer Manufacturing Co., Ltd., it was put into operation in 2014. So far, the product has not experienced any major accidents, and the operation is in good condition. The indicators of the factory test and routine test are all at normal levels. The energy storage type virtualized ideal power supply is used for the short-circuit withstand test.

[0112] Before the test, carry out the relevant test data test and hang the iron core for inspection, and make identification marks.

[0113] The test takes the form of short circuit on the low voltage side (short circuit first), pressurization on the high voltage side (pressurization later), and is carried out phase by phase according to the wiring of the single-phase test circuit.

[0114] According to the test plan, carry out the short-circuit withstand test, Figure 5 It is the test waveform of the first test voltage a...

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Abstract

The invention discloses a test system and method for the short-circuit bearing capability of a distribution transformer. An alternating-current power source is connected to an input terminal of a phase shifting transformer through an input line; and an incoming line switch for adjusting connection or disconnection of the input line is arranged at the input line. The output terminal of the phase shifting transformer is connected to an input terminal of a power unit group; the output terminal of the power unit group is connected to an output line; and an outgoing line switch for adjusting the connection or disconnection of the output line is arranged at the output line. The power unit group includes a plurality of power units that are connected in parallel; and each power unit includes a rectifying circuit, an energy storage capacitor and an inverter circuit. The output terminal of a controller is connected with a control terminal of the power unit group to adjust parameters of the powerunit group, so that an alternating-current voltage is outputted stably. Therefore, the cost for testing the short-circuit bearing capability of a distribution transformer can be lowered; the requirement on the field by the test system can be reduced; the test difficulty is reduced; and the test efficiency is improved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a test system and method for short-circuit withstand capability of distribution transformers. Background technique [0002] Distribution transformers cannot completely rely on conventional tests to judge their ability to withstand short-circuit electromotive force, and a short-circuit withstand test must be carried out to determine whether the overall mechanical strength of the coil meets the system requirements. GB / T 1094.3-2003 "Power Transformer Part 3 Insulation Level Insulation Test and External Insulation Air Gap" and GB 50150-2016 "Electrical Equipment Handover Test Standard for Electrical Installation Engineering" have put forward the insulation test and performance test of distribution transformers. Detailed test requirements have been specified, and the test development is relatively mature. However, the current short-circuit capacity test is not listed as a mandatory ins...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/12
Inventor 郭绍伟马继先龙凯华李昊扬牛铮杨大伟毛婷孙云生葛凯
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY
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