System and method for testing short circuit withstanding capability of transformer or electric reactor
A test system and transformer technology, applied in the direction of testing circuits, testing dielectric strength, etc., can solve the problems of inability to carry out large-capacity short-circuit withstand capacity, difficult to guarantee stability, and test capacity limitations, and achieve convenient operation and avoid noise interference. , the effect of reducing active and reactive power
Active Publication Date: 2012-09-19
沈阳变压器研究院有限公司
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Problems solved by technology
[0005] In contrast, it is more economical to directly provide the power system, but its test capability is limited by the capacity and operation of the power grid, and it is impossible to carry out large-capacity short-circuit withstand capacity tests
Single or multiple impact generators can provide larger capacity, but the investment is large and the operation is complicated
Although the combined operation of the power grid and the generator can provide a large test capacity, the investment is huge, and the operation is very complicated, and its stability is difficult to guarantee.
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[0020] The short-circuit withstand capability test system of transformer or reactor of the present invention mainly utilizes the capacitance compensation principle, adopts the capacitance compensation method, connects the compensation capacitor in parallel with the inductive load, and compensates the inductive current with the capacitive current.
[0021] Such as figure 1 As shown, the schematic diagram of capacitance compensation of the present invention, the parallel impedance of this loop with L 2 And C changes, can be positive or negative or infinite, that is, inductive load or capacitive load. In the short-circuit strength test, take the denominator (1-ω 2 L 2 C) is a positive value (that is, perceptual), between 1 and 0, and Z is at ωL 2 Between and infinity, if Z becomes larger, the capacity of the power supply decreases, at power supply capacity is not required.
[0022] This loop capacitive current i 3 Echizen voltage (u) 90°, inductor current i 2 90° behind...
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The invention discloses a system for testing the short circuit withstanding capability of a transformer or an electric reactor, which comprises a power source, a capacitance compensating circuit formed from a compensating capacitor C and a transformer S to be tested or an electric reactor S to be tested, wherein the capacitance compensating circuit is connected with the transformer S to be tested or the electric reactor S to be tested in parallel. The invention also discloses a short circuit testing method. When the system and method for testing the short circuit withstanding capability of a transformer or an electric reactor are used for testing a large product, the testing capacity can be increased, and the system is convenient to operate.
Description
technical field [0001] The invention relates to the testing field of transformers or reactors, in particular to a short-circuit withstand capacity test system and method of transformers or reactors. Background technique [0002] Power transformer or reactor is one of the most critical equipment in the power system and plays a very important role in the power system. In the power system, power equipment is affected by various working conditions and faults, among which short-circuit fault is one of the most serious faults. Therefore, the short-circuit strength of transformers or reactors has received extreme attention from the power industry and manufacturing industry. The mandatory basic standard GB1094.5 has been formulated for transformer or reactor products in terms of the ability to withstand short-circuit. All transformer or reactor products must be tested according to the above standards before they are officially put into use. [0003] There are many kinds of transfo...
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IPC IPC(8): G01R31/12G01R31/14
Inventor 陈道辉杜建松陈奎
Owner 沈阳变压器研究院有限公司