Power system facility calibration is a compulsory task that requires in-site operations. In this work, we propose a remote calibration device that incorporates edge intelligence so that the required calibration can be accomplished with little human intervention. Our device entails a wireless serial port module, a Bluetooth module, a video acquisition module, a text recognition module, and a message transmission module. First, the wireless serial port is used to communicate with edge node, the Bluetooth is used to search for nearby Bluetooth devices to obtain their state information and the video is used to monitor the calibration process in the calibration lab. Second, to improve the intelligence, we propose a smart meter reading method in our device that is based on artificial intelligence to obtain information about calibration meters. We use a mini camera to capture images of calibration meters, then we adopt the Efficient and Accurate Scene Text Detector (EAST) to complete text detection, finally we built the Convolutional Recurrent Neural Network (CRNN) to complete the recognition of the meter data. Finally, the message transmission module is used to transmit the recognized data to the database through Extensible Messaging and Presence Protocol (XMPP). Our device solves the problem that some calibration meters cannot return information, thereby improving the remote calibration intelligence.
This paper is mainly to develop a measurement standard for insulation parameters on-line monitoring device. The paper achieves measurement standards for the Voltage, current, capacitance and dielectric loss data of insulation parameter monitoring device by voltage, current sync source generated by DDS technology; precision voltage source, constant current source module composed by op amp, voltage transformers and current transformers Group; Capacitive analog reference voltage and leakage current equipment. After being calibrated by the national legal metrology bodies, the metering standard technical indicators have reached the design requirements.
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