Universal electric power mutual-inductor verify device

Abstract

The apparatus comprises: a signal modulating unit, a check meter circuit, a digital signal process unit, a display unit and a network interface unit. The analog output signals from the mutual inductor under test and the standard transformer are inputted to the signal modulating unit to make modulation; the modulated signals are inputted to the check meter circuit; the digital signals from the mutual inductor are directly inputted into the check meter circuit; the modulated analog signals and / or the un-modulated digital signals are processed by the check meter circuit to form the digital signals in clock and data synchronization; the obtained synchronous digital signals are outputted to the signal processing unit; after processed to get the amplitude, frequency and phase information of the tested signals, then figuring out the ratio difference and angle difference; comparing the index result obtained from the mutual inductor under test with the measurement result of the standard mutual inductor to evaluate the precise level of the mutual inductor under test.

Description

technical field [0001] The invention relates to the transformer calibration technology in the field of power system automation technology, in particular to a device for measuring the measurement accuracy of electromagnetic and electronic power transformers. Background technique [0002] In the field of power system automation construction, a large number of power transformers are produced and used every year. Power transformers are important equipment for electric energy measurement and relay protection in power systems. Calibration devices are special precision instruments for testing and measuring transformer errors. Therefore, it is of great significance to vigorously develop the transformer calibration device to improve the development and production level of the transformer. [0003] At present, there are two main types of power transformers: one is electromagnetic transformers, and the other is electronic transformers. According to the different forms of the measured s...

AI Technical Summary

Problems solved by technology

At present, the existing portable calibration devices are simple in structure and relatively single in function, and are easily affected by various error factors and difficult to guarantee the calibration accuracy; while the computer-based virtual instrument calibration scheme is powerful, but the cost is high, and currently Can not meet the requirements for precision measurement of various power transformers

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