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Digital output DCVT field calibration system

A technology of digital output and on-site calibration, applied in measuring devices, measuring electrical variables, instruments, etc., can solve the problems that do not involve the frequency response and time characteristics of DC voltage transformers, and the low synchronization accuracy of the calibration system, to ensure Confidence, the effect of improving accuracy

Inactive Publication Date: 2019-11-22
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a digital output DCVT on-site calibration system to solve the problem of low synchronization accuracy of the existing calibration system and does not involve the frequency response and time characteristics of the DC voltage transformer

Method used

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  • Digital output DCVT field calibration system

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Embodiment Construction

[0020] figure 1 It is a schematic diagram of the structure of the digital output DCVT on-site verification system for this application, such as figure 1 As shown, the digital output DCVT on-site verification system includes a high-stable DC voltage source 1, a calibrated channel 2, a standard channel 3, and a calibration channel 4. 3 provides a DC voltage signal, the calibrated channel 2 is the calibrated DC voltage transformer 21 , and the standard channel 3 is the standard DC voltage divider 31 .

[0021] The calibration channel 4 includes a front unit input interface 41 and a digital signal interface 42 connected by a synchronization module 43, the input end of the front unit input interface 41 is connected with the standard channel 3 through a front unit 44, and the front unit input interface 41 The output end is connected to the data analysis module 45, wherein the front unit 44 is used to collect the digital signal of the standard channel 3, and convert the digital sign...

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Abstract

The invention discloses a digital output DCVT field calibration system. Based on the theory of an absolute delay digital output DCVT field calibration method, an independent front-end unit is used toachieve in-situ high-precision conversion of digital signals in standard channels. In particular, a high-precision AD acquisition unit of a DC electronic transformer calibrator is preposed, a converted data sequence is transmitted through an optical fiber to a front-end unit input interface of the DC electronic transformer calibrator, primary equipment and secondary equipment are isolated, and interference of secondary small voltage signal transmission of a standard voltage divider in field calibration can be avoided. The calibration system acquires a DC component through a DC component-containing wavelet coefficient to enhance the signal extraction accuracy. A test system based on a feedback time difference between a standard step signal and a calibrated DCVT for absolute delay is put forward, an uncertainty evaluation method is given through uncertainty source analysis on the calibration system, and the reliability of the calibration result is ensured.

Description

technical field [0001] The present application relates to the technical field of voltage transformers, in particular to a digital output DCVT on-site verification system. Background technique [0002] HVDC transmission system has become an important project to solve large-capacity, high-voltage, cross-regional power transmission and energy interconnection. Among them, the entire signal transmission of the direct current voltage transformer (DCVT) involves multiple links and provides important voltage signals for the measurement, control and protection of the DC system. Therefore, its DC component transmission accuracy, frequency response and Whether the step characteristics meet the requirements is the key to the safe operation of the DC system. [0003] According to the requirements of DL / T274-2012 "±800kV High Voltage DC Equipment Handover Test", DCVT on-site accuracy handover test should be carried out. At present, a commonly used DCVT on-site calibration method is to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 朱梦梦沈映泉朱全聪王熙林聪张新曹敏唐标李波罗强胡桂平杨忠州徐天奇杨兰高洁张崇伦尹航李博
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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