Embedded check meter for electronic mutual inductor

Abstract

The invention discloses an embedded check meter for an electronic mutual inductor. The check meter comprises a high-speed DSP (digital signal processing) module and a precision resistance voltage dividing module, wherein, an input terminal of the high-speed DSP module is respectively connected with a CPLD (complex programmable logic device) module, an optical Ethernet chip and a power Ethernet chip; and the precision resistance voltage dividing module is connected with an input terminal of the high-speed DSP module through a range switching module, an analogue switch module, a PGA (programmable gain amplifier) module and a high-precision AD (analog-to-digital) module in sequence. The check meter integrates a plurality of functions together, and can be utilized as the check meter for the electronic mutual inductor as well as a merging unit, a signal collector and a signal converter which are used in field debugging, a high-precision voltmeter, an ammeter, a power meter, a phase meter and an impedance measuring instrument. Therefore, the check meter has high cost performance, and can be widely applied to the electric power field.

Description

technical field [0001] The invention relates to an electronic device, in particular to an embedded electronic transformer calibrator. Background technique [0002] At present, the transformer has developed from the electromagnetic transformer to the electronic transformer. Since the secondary output of the electronic transformer is an analog small voltage or an optical digital signal, it is difficult for the electromagnetic transformer calibrator of the traditional difference measurement principle to calibrate the electronic transformer. For transformers, it is necessary to research new equipment to check the accuracy of electronic transformers. The existing electronic transformer is based on the mode of industrial computer + acquisition card, which is simple in function, expensive, inconvenient to expand and carry, difficult to trace the source, and is not a professional electronic transformer calibrator. [0003] At present, electronic transformer accuracy calibration is ...

AI Technical Summary

Problems solved by technology

[0004] Defects in the existing technology: the standard channel needs a signal conversion box to convert the strong electrical signal into a weak signal that the acquisition card can accept, and the channel under test needs a fiber optic transceiver to convert optical Ethernet into electrical Ethernet, so the whole device appears fragmented. It is inconvenient to carry; the acquisition card is provided by a third-party manufacturer, and it is generally used as an assistant for analog and switch values. It is not compatible with the time synchronization functions required by the transformer, and it is inconvenient to expand functions.

Images