A method of preparing a current transformer with a simplified error test function
A technology for current transformers and testing functions, applied in the field of transformers, can solve the problems of long test loops, large burden of equipment investment and manpower input of test units, etc., and achieve the effect of reducing workload
Active Publication Date: 2018-08-14
北京电科智芯科技有限公司
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Problems solved by technology
At the same time, due to the extremely long test circuit, the capacity requirement of the high current booster is often greater than mega VA, resulting in a greater burden on the test unit in terms of equipment investment and manpower input
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[0023] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0024] like figure 1 Described: A circuit diagram of a power current transformer with a simplified error test function. N 1 is the primary winding, N 2 For the test winding, N C for the test winding. When the current transformer is working normally, N 2 is the output winding, N C Connect the two ends of the point device; when performing error measurement, set N C winding as a primary winding, N 2 The winding is used as a secondary winding to form a temporary current transformer to participate in error measurement.
[0025] like figure 2 Shown: Error measurement circuit, N C The winding is connected to the polarity end of the primary winding of an external standard current transformer, N 2 The winding is connected to the polarity end of the secondary winding of the external standard current transformer. Tx represents the formed tempo...
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The invention provides a method of manufacturing a current transformer with the function of simplifying an error test. The method includes the following steps that a primary winding N1 is wound around an iron core of the current transformer; double secondary windings are wound around the iron core of the current transformer and are called an experiment winding N2 and a test winding NC respectively. The invention provides the method of manufacturing the current transformer with the function of simplifying the error test. When field error measurement is carried out on the power current transformer, the workload of field current transformer measurement errors is greatly reduced, and operation and maintenance working efficiency will be greatly improved by simplifying the power transformer field commissioning test; as the test winding is additionally arranged in a conventional current transformer, the purpose of reducing currents is achieved by increasing the number of turns through the equal ampere-turn principle, and a large current error test is converted to be carried under small currents; the method can be used in the field commissioning test of the current transformer and periodic inspection.
Description
technical field [0001] The invention relates to a transformer, in particular to a current transformer with a simplified error test function. Background technique [0002] The current transformer as a power metering device is an important basis for evaluating the economic operation of the power grid. According to the measurement law, all power current transformers must undergo on-site handover tests before they are put into operation. With the increase of the voltage level, the primary rated current of the power current transformer continues to increase. The UHV projects that have been completed generally need to test the error before the installation of the current transformer coil, and in most cases, the equal ampere-turn method is used. If the comparison method is used to test the CT error characteristics after the CT is installed, it is necessary to connect the standard CT and high-power current booster equipment through the two outlet bushings of the GIS to form a closed...
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IPC IPC(8): H01F38/28H01F27/28G01R15/18G01R3/00
Inventor 王欢项琼冯宇岳长喜汪泉徐思恩刘浩彭淑华王雪
Owner 北京电科智芯科技有限公司