Method of electrified checkout of current mutual inductor

A current transformer and current technology, applied in the direction of instruments, measuring electric variables, measuring devices, etc., can solve the problems of potential failure hidden dangers of missing transformers, failure to timely and truly reflect the running transformers, etc., to improve anti-interference ability, The effect of improving precision and simple method

Inactive Publication Date: 2009-04-15
红相电力(上海)有限公司
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Problems solved by technology

The above method is limited to the offline test of the power outage, and cannot timely and truly reflect the state of the ru

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  • Method of electrified checkout of current mutual inductor

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[0012] The present invention will be further described below in conjunction with the drawings and embodiments.

[0013] Such as figure 1 As shown, the current transformer live calibration requires the use of an arithmetic unit 6, a front signal processor 4 and a primary signal processor 2.

[0014] During the test, the current clamp of the primary signal processor 2 is clamped on the primary side of the transformer under test, the output of the primary signal processor 2 is connected to the pre-signal processor 4 through the optical fiber 3; the output of the pre-signal processor 4 Connect to the arithmetic unit 6 through the RS485 communication line 5; connect the secondary side 9 of the tested current transformer to the arithmetic unit 6 with the secondary current test lines 7, 8 according to the minus polarity; during the calibration process, the primary signal processor 2 The collected primary signal is preprocessed and sent to the pre-signal processor 4 through the optical fi...

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Abstract

The invention provides a current transformer electrification correcting method. In the method, a current signal is sampled at the primary side and the secondary side of a transformer in on-line operation, the sampled analog signal is converted into a digital signal, the digital signal is processed by an arithmetic unit by applying error formula of the transformer, finally the actual current value, ratio and angular difference of the current transformer are obtained, thus realizing the electrification correction of the transformer. The invention has the advantages that the electrification correction of the current transformer is realized; the devices such as a standard current transformer, an upwash device, a load box and the like are not required, thus the correcting device is simplified and is lightweight and portable, and the correcting method is simple; high insulating safe measuring is realized; capacity of resisting disturbance in the measuring process is improved; and the measuring precision is improved.

Description

technical field [0001] The invention relates to a testing method for electrical parameters, in particular to a live calibration method for a current transformer. Background technique [0002] Conventional current transformer calibration is mainly carried out by comparison method. When the equipment is powered off and offline, the current boost source (device) is used to provide test current to the standard current transformer and the primary winding of the current transformer under test at the same time, and then the standard current transformer The output of the secondary winding of the current transformer is true, and the output error of the secondary winding of the detected current transformer is calculated or measured. The above method is limited to the offline test of power outage, and cannot timely and truly reflect the state of the running transformer under the actual load condition, and loses the best time to detect the potential failure of the transformer. Content...

Claims

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Application Information

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IPC IPC(8): G01R35/00G01R35/02
Inventor 何肖军徐志斌
Owner 红相电力(上海)有限公司
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