双变比计量智能控制装置及方式研究
Research on Intelligent Control Device and Method of Double Variable Ratio Measurement

本文介绍了一种用于双比值测量的智能控制装置及其控制方式。该装置由两个或三个高压双变比电流互感器和一个微机控制器组成。每台高压双变比电流互感器均与单相变比控制电路电连接。单相变比控制电路包括测量变压器、继电器节点1、继电器节点2、继电器节点3等。继电器节点4、高精度计量电流互感器；装置计量控制方式：微机控制器通过测量变压器实时检测高压双比电流互感器的高压侧电流值，并对涌流进行滤波。如果检测到电流值大于或等于高压双变比电流互感器小变比额定电流的上限，则装置进入大变比控制模式。相反，该状态进入小变比控制状态。采用高压双变比电流互感器的电流表，实现了量值比的自动切换和单表测量，提高了测量精度。
The invention relates to a double-ratio metering intelligent control device and its control mode. The device comprises two or three high-voltage double-ratio current transformers and a microcomputer controller. Each high-voltage double-ratio current transformer is electrically connected with a single-phase ratio control circuit. The single-phase ratio control circuit includes measuring transformer, relay node 1, relay node 2 and relay node 3. Relay Node 4 and High Precision Metro-logical Current Transformer; Metrological Control Mode of the Device: The Microcomputer Con-troller detects the high voltage side current value of the high voltage dual-ratio current transformer in real time by measuring the transformer and filters the inrush current. If the current value is detected to be greater than or equal to the upper limit of the nominal current of the small conversion ratio of the high voltage dual-ratio current transformer, the device enters the large conversion ratio control. The system state, on the contrary, enters the small variable ratio control state. The invention can realize automatic switching of the magnitude-to-magnitude ratio and sin-gle-Meter metering by adopting the current meter with high voltage and double-ratio current transformer, and improve metering accuracy.