Read The Difference Between DTU, FTU, TTU, and RTU In One Article (3)
Distribution Transformer Supervisory Terminal Unit (TTU)
TTU monitors and records the operating conditions of distribution transformers, and calculates voltage RMS, current RMS, active power, reactive power, power factor, and active energy every 1 to 2 minutes according to the three-phase voltage and current sampling values on the low-voltage side, reactive energy, and other operating parameters. TTU records and saves a period of time (one week or one month) and the hourly value of the above-mentioned array on a typical day, the maximum and minimum values of voltage and current and their occurrence time, power supply interruption time, and recovery time. The TTU recording data is stored in the non-volatile memory of the device, and the recorded content will not be lost when the device is powered off. The main station of the distribution network regularly reads the TTU measurement value and historical records through the communication system, and timely find the operation problems such as transformer overload and power failure. According to the recorded data, statistical analysis of voltage qualification rate, power supply reliability, and load characteristics, and provide basic data for load forecasting, distribution network planning, and accident analysis. If communication conditions are not available, use a handheld computer to read records on-site every week or month, and then transfer them to the distribution network master station or other analysis systems. The structure of TTU is similar to that of FTU because it has only data acquisition, recording, and communication functions, but no control function, the structure is much simpler. In order to simplify the design and reduce the cost, the TTU is powered by direct voltage transformation and rectification on the low-voltage side of the distribution transformer and is not equipped with a battery. When there is a reactive power compensation capacitor bank on-site, in order to avoid repeated investment, TTU should increase the capacitor switching control function.
Features of TTU:
It is suitable for monitoring and electric energy metering of power supply companies, county-level power companies, power plants, industrial and mining enterprises, military colleges, rural power management stations, and 100-500KVA distribution transformers. In conjunction with power consumption monitoring for line loss assessment, it can also send all data to the power consumption management center through the GPRS communication network, providing the most real and accurate decision-making basis for the optimization of the low-voltage distribution network.
