High-performance current transformer intelligent analyzer

Abstract

The invention relates to a high-performance current transformer intelligent analyzer, which is applied to a saturation characteristic test for a transient state current transformer, direct tests for a sleeve current transformer and a current transformer in GIS and all parameter tests for all conventional transformers, and belongs to the technical field of current transformer test instruments. During voltage current characteristic tests for the transient state current transformer and a conventional high saturation characteristic transformer, because only the output frequency needs to be changed during the tests, the intelligent analyzer can perform the test on the transient state current transformer of which the saturation voltage is 15,000 kilovolts when the maximum amplitude value is 120 volts, and change the blank that at present no domestic equipment performs test on a transient sate winding; besides, the instrument output test voltage is low, which cannot cause potential safety hazards to the equipment and the personal safety; and because a booster transformer (generally, the weight of a transformer is tens of kilograms) for boosting is not needed, the weight of equipment to be tested is greatly reduced.

Description

technical field [0001] The invention relates to a high-performance intelligent analyzer for current transformers, which is used for testing the saturation characteristics of transient current transformers, direct testing of bushing current transformers and current transformers in GIS, and testing all parameters of conventional transformers. The utility model belongs to the technical field of current transformer testing instruments. Background technique [0002] The main test items of the current transformer are the volt-ampere characteristics of the current transformer and the transformation ratio test of the current transformer. It is composed of upflow device, measuring circuit, man-machine dialogue and printer. The single-chip microcomputer control part is responsible for controlling the measurement and calculation of the output voltage and current and analog quantities; the amplifier outputs 0-100V AC voltage and 0-5A AC current; the booster boosts the 0-100V AC voltage...

AI Technical Summary

Problems solved by technology

[0003] 1. The built-in booster and current booster of the device itself are bulky

[0004] 2. In the volt-ampere characteristic test, this test method has great limitations: with the increase of the system voltage level, the saturation voltage of the transformer is getting higher and higher, and an external step-up transformer is required for the test. The test equipment is even more cumbersome, and the weight of the entire test instrument is greater than 60KG

For transient current transformers, the saturation voltage of many transient transformers is as high as 15KV, and the average saturation voltage is about 8KV. This test method cannot output such a high voltage at all, and the insulation withstand voltage of the transformer itself does not exceed 4KV. There is a step-up transformer with an output of 15KV (this kind of transformer weighs more than 200KG). Using this test method to test will break down the insulation withstand voltage of the current transformer and cause fatal damage to the transformer.

Conventional test products can only be applied to the test of some current transformers below 220KV (saturation voltage less than 2000V)

[0005] 3. During the transformation ratio test, it is impossible to test the transformer with a relatively large transformation ratio. For example, the current domestic 60WMVA generator set has an export transformer transformation ratio of 25000 / 5. According to the conventional test, it is necessary to input a current of 25000A. No test equipment can output such a large current. The output of a conventional tester is generally 500A-800A, and it can reach 1500A after an external current booster is connected. 1500 / 5 (about 40% of the total number), these current transformers cannot be tested, and for the small ratio current transformer test, an external current booster is required. These current boosters are very heavy, and only the test line weighs Tens of kilograms, not suitable for on-site testing, nor suitable for transportation and carrying

[0006] 4. During the transformation ratio test, since the primary side of the bushing transformer and the GIS internal transformer has only one terminal, and the other terminal is inside the transformer and GIS, this method cannot be used for bushing transformers and GIS internal transformers. Take a direct test test

When testing these transformers, it is necessary to evacuate the transformer oil, lift out the bushing current transformer, and then carry out the test. After the test, it needs to be reinstalled. The test process of a bushing current transformer may last for a day time, the work efficiency is extremely low, and the power outage time is prolonged

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