Short-circuit detection system and method of multi-secondary-side phase-shifting transformer
A phase-shifting transformer and short-circuit detection technology, which is applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of slow response time and high short-circuit protection cost, and achieve the effect of avoiding false alarms.
Inactive Publication Date: 2018-05-18
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide a short-circuit detection system and method for a multi-secondary phase-shifting transformer for the above-mentioned problems of high cost and slow response time of the secondary side short-circuit protection of the multi-secondary phase-shifting transformer
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0038] When an electromagnetic component suddenly short-circuits, its flux linkage cannot be mutated, but a reverse flux linkage Ψ will be generated - It acts on the main magnetic flux and offsets the winding flux linkage close to the short-circuit winding space, resulting in a drop in the secondary terminal voltage.
[0039]For example, for a multi-secondary phase-shifting transformer with a capacity of 1000kVA and a transformation ratio of 10kV / 690V, the primary voltage is 10kV and the secondary voltage is 690V. The primary side is connected by a Y-shaped winding, and each secondary side is conne...
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The invention provides a short-circuit detection system and method of a multi-secondary-side phase-shifting transformer. The multi-secondary-side phase-shifting transformer comprises multiple paths ofsecondary windings; the detection system comprises a voltage detection unit, a mathematical operation unit and a short circuit determining unit; the voltage detection unit is used to obtain voltage data of the multiple paths of secondary windings; the mathematical operation unit is used to carry out mathematical operation of the voltage data of the multiple paths of secondary windings to obtain amathematical operation result; and the short circuit determining unit is used to compare the mathematical operation result with a preset value, and determines that short circuit occurs in the secondary side of the multi-secondary-side phase-shifting transformer when the mathematical operation result exceeds the preset value. According to special electromagnetic relation of the multi-secondary-side phase-shifting transformer itself as well as the voltage data of the secondary winding, short circuit detection in the secondary side is carried out, a short-circuit fault can be identified effectively, and false alarm caused by asymmetric load in the secondary side of the transformer can be avoided.
Description
technical field [0001] The invention relates to the field of multi-secondary phase-shifting transformers, and more specifically relates to a short-circuit detection system and method for multi-secondary phase-shifting transformers. Background technique [0002] Power unit cascaded high-voltage inverters have been widely used in steel, petrochemical, mining, metallurgy, and urban construction due to their mature technology, low harmonics on the grid side and motor side, high power factor, and low price. It plays an important role in reducing energy consumption and improving processes, especially for high-pressure fans and water pump loads, the energy-saving effect is remarkable. [0003] Multi-secondary phase-shifting transformers play an important role in power unit cascaded high-voltage inverters, which can realize multiple unit voltage inputs and reduce input harmonics. The multi-secondary phase-shifting transformer provides power for multiple power units in the power uni...
Claims
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王双翼张振海周杰陈实蔡准刘艳付文轩
Owner SUZHOU INOVANCE TECH CO LTD