云边端协同在线校准技术体系框架的工程应用

SF6密度继电器作为保障电气设备安全运行的重要设备，需要花费巨大的人力、物力定期校验，待校验的密度继电器不仅数量庞大，而且校验过程存在效率低、成本高、数据录入容易出错等问题，因此对其校验过程智能化升级具有重要现实意义。为解决电力系统数量庞大的SF6密度继电器在维护保障工作中遇到的这些问题，借助分层分布式思路，提出了通过云边端协同，统一完成工业现场重要仪器仪表在线校准的技术体系实现框架。在此基础上，对该技术体系开展了工程应用。在云边端协同在线校准技术体系框架的指导下，提出了在现有密度继电器上加装轻量化在线校验装置的方案，使密度继电器能够在电气设备运行过程中自动完成校验和上报校验结果，有效地解决了现有密度继电器需要在电气设备停电后采用人工校验的问题。经过实验验证，以及与SF6密度继电器校验仪对比测试，该装置精度与校验仪精度相近，能够满足SF6密度继电器的校验需求，完全可以用于支持为SF6密度继电器建立云边端协同的统一在线校准大系统，来解决SF6密度继电器校验困难这一行业痛点问题。

Engineering Application Practice of the Technical System Framework of Online Calibration through Cloud-side-end Collaboration

As essential equipment to ensure the safe operation of electrical equipment, the SF6 density relay needs an enormous workforce and material resources to be calibrated regularly. There are not only a large number of density relays to be calibrated but also some problems in the calibration process, such as low efficiency, high cost, and error-prone data entry. Therefore, it is of great practical significance to intelligently upgrade the calibration process. In order to solve these problems encountered in the maintenance and support of a large number of SF6 density relays in the power system, with the help of hierarchical distributed thinking, a technical system implementation framework for unified online calibration of essential instruments and meters in the industrial field through cloud edge-end collaboration is proposed. On this basis, the technical system has been applied in engineering. Under the guidance of the technical framework of collaborative online calibration at cloud edge, a scheme of adding a lightweight online calibration device to the existing density relay is proposed. So that the density relay can automatically complete the calibration and report the calibration results during the operation of electrical equipment, which effectively solves the problem that the current density relay needs to be manually calibrated after the power failure of electrical equipment. Experimental verification and comparison test with the SF6 density relay calibrator have proved that the precision of this device is similar to that of the calibrator. The device can meet the calibration requirements of the SF6 density relay. It can be used to support the establishment of a unified online calibration system for SF6 density relay and solve the painful problem of SF6 density relay calibration.