DTSD series anti backflow rail type electric meter, secondary side metering

Ankrui Liu Qiuxia

1 DTSD series anti backflow rail type electric meter, secondary side meteringOverview

The DTSD1352 rail type multifunctional energy meter is an intelligent instrument designed mainly for the electricity statistics and management needs of power systems, industrial and mining enterprises, and public facilities. The product has the advantages of high accuracy, small size, and easy installation. Integrate common power parameter measurement and energy metering and assessment management, providing various energy data statistics for the past 48 months. It has 2-31st harmonic and total harmonic content detection, with switch input and switch output to achieve "remote signaling" and "remote control" functions, and has alarm output. It has RS485 communication interface and can choose MODBUS-RTU or DL/T645 protocol. This power meter can be widely used in various control systems, SCADA systems, and energy management systems. The product meets the requirements of the enterprise standard "Enterprise Standard for Rail mounted Electric Energy Meters".

2 DTSD series anti backflow rail type electric meter, secondary side meteringModel Description

3 Function List

Note: When specifying external transformers, harmonic measurement is standard, while other specifications are optional.

2: Default reactive power pulse, clock pulse, and switch output can be selected from three options;

3: Choose between active switch quantity and second communication channel;

4: When selecting temperature measurement function, the optional functions mentioned in 1 and 2 are not available.

Why do we need to use secondary mutual inductance meters for photovoltaic renovation

• Adapt to different current and voltage levels: The output current and voltage of photovoltaic systems may vary due to factors such as the number of photovoltaic panels, installation methods, and lighting conditions. The secondary mutual inductance meter uses current transformers (CT) and voltage transformers (PT) for signal conversion, which can convert different sizes of primary side current and voltage into a unified standard signal on the secondary side, usually smaller current and voltage values such as 5A, 100V, etc., to adapt to the measurement range of the meter and facilitate accurate measurement and monitoring.

• Improving measurement accuracy: Transformers have high precision and stability, and can accurately convert large currents and high voltages on the primary side into small currents and low voltages on the secondary side according to the transformation ratio, providing accurate measurement signals for electric meters. The combination of secondary mutual inductance meters and high-precision transformers can effectively reduce measurement errors, accurately measure the power generation and consumption of photovoltaic systems, and is crucial for evaluating the performance and economic benefits of photovoltaic systems.

• Enhancing safety: In photovoltaic retrofitting, directly connecting high voltage and high current on the primary side to the electricity meter can pose safety risks. The secondary mutual inductance meter electrically isolates the primary and secondary sides through a transformer, keeping the secondary side of the meter in a low voltage and low current state. This not only protects the meter itself, but also greatly reduces the risk of electric shock for operators, improving the safety and reliability of the system.

• Easy signal transmission and remote monitoring: The standard signal output by the secondary mutual inductance meter facilitates signal transmission, and the measurement signal can be transmitted to remote monitoring equipment or power management systems through cables or other communication methods, achieving remote monitoring and data acquisition of the photovoltaic system. This is particularly important for large-scale photovoltaic renovation projects, such as distributed photovoltaic power stations and integrated photovoltaic buildings, to facilitate operation and maintenance personnel to understand the real-time operation status of the photovoltaic system, discover problems in a timely manner, and handle them.

• Implementing multi loop measurement and centralized management: In some photovoltaic renovation projects, it may involve measuring the electrical energy of multiple photovoltaic modules or multiple branches. The secondary mutual inductance meter can be used in conjunction with multiple transformers to measure the current and voltage of multiple circuits. Then, through the internal calculation and processing of the meter, the electrical energy of each circuit can be measured and counted separately, which facilitates centralized management and analysis of the entire photovoltaic system and helps optimize system operation and improve energy utilization efficiency.