A large-capacity transformer characteristic test system based on high-voltage variable-frequency power supply

Abstract

The invention discloses a characteristic test system for a high-capacity transformer based on a high-voltage variable-frequency power supply, which comprises the high-voltage variable-frequency power supply, an intermediate transformer, a reactive and harmonic power compensation filtering device and a measurement control device, wherein output points a and b of the high-voltage variable-frequency power supply are connected with two groups of input points a1 and b1 as well as a2 and b2 of the intermediate transformer respectively; two groups of output points A1 and B1 as well as A2 and B2 of the intermediate transformer are connected with two groups of input points of a compensating capacitor bank of the reactive and harmonic power compensation filtering device respectively; and the two groups of input points of the compensating capacitor bank of the reactive and harmonic power compensation filtering device are connected with two groups of input points of a filter bank of the reactive and harmonic power compensation filtering device respectively. With the adoption of the mode, the system can overcome many shortages and defects of traditional power supply equipment such as power generators and voltage regulators, and is particularly applicable to characteristic parameter tests of the high-voltage and high-capacity transformer.

Description

technical field [0001] The invention relates to a transformer characteristic (including no-load characteristic, load characteristic and temperature rise test) test system, in particular to a large-capacity transformer characteristic test system based on a high-voltage variable frequency power supply. Background technique [0002] With the increase of the grid voltage level, the capacity of the power system transformer is also increasing. In particular, for large-capacity transformers, such as ±1100kV UHVDC converter transformers, limited by transportation and manufacturing conditions, they generally tend to be delivered to users in the form of on-site assembly and on-site factory testing. And most of them are in the form of three single-phase transformers forming a three-phase transformer, which puts forward extremely high requirements for its characteristic parameter test equipment, especially the capacity requirements of power supply devices, nonlinear reactive power and h...

AI Technical Summary

Problems solved by technology

The synchronous generating set is bulky and heavy, requires a lot of transportation and installation work, and requires high investment. It is not easy to move and is not suitable for on-site use.

High-voltage regulators, especially single-phase products, have a small capacity, which is difficult to meet the test requirements, and there are problems of contact noise and heat generation, short running time, poor load capacity and voltage regulation performance, and will lead to serious unbalanced system loads

The output voltage of the low-voltage variable frequency power supply is low, and it is difficult to manufacture the matching large ratio intermediate transformer. At the same time, due to the large output current, the reliability is low

On the other hand, limited by the specifications of the electronic devices (IGBTs) used, it is difficult to increase the capacity and cannot meet the demand

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