Hydropower is the second largest component of electricity production. Compared with thermal power, hydropower is a renewable energy source and has the advantages of high environmental benefits, no harmful gases and smoke and dust, high power generation efficiency, and low power generation costs. The ideal power generation mode. Jinping Hydropower Station includes Jinping I and II hydropower stations, which together form the Jinping “Gemini Constellation†power station. It is considered to be the most difficult construction arrangement in the country and even in the world, with the greatest difficulty in construction management, the greatest difficulty in engineering technology, and the most dangerous construction environment. One of the giant hydroelectric stations.
The Jinping hydropower station automation control system mainly includes the monitoring system of the hydroelectric generating set, the control system of the switch station, the public equipment control system of the hydropower station, the gate automatic control system of the hydropower station and so on. Through the open and modularized structure design, monitoring, collection, control and regulation of the hydropower station production process are realized, and the monitoring and protection functions of the auxiliary equipment such as generator sets, transformers, and lines and other auxiliary equipment such as oil, gas and water systems are realized. . Therefore, Jinping Hydropower Station has a very high requirement for this system, including strong data acquisition and processing capabilities and strong stability, effectively fulfilling the “unattended†requirement of the automatic monitoring system for hydropower stations, and having flexibility and good compatibility. , safe and reliable, and strong anti-interference ability.
Weidmüller succeeded in winning the Jinping Hydropower Project and provided an integrated electrical connection solution for the project, applying the control layer of the auxiliary machine system. Weidmüller products used in this project include intermediate relays, high current terminals, flat panel and rail switching power supplies, signal isolators, terminal blocks and other products, providing a powerful guarantee for the safe and reliable operation of the system.
Jinping II Hydroelectric Power Station Effect Map Jinping Hydropower Station Effect Map
Stable and reliable power supply
The safe and reliable open source power supply is very important for the reliability of the system. Once the switching power supply fails, if it cannot be discovered in time, it will bring serious consequences. Weidmüller PRO-M series switching power supply is used in the auxiliary control system cabinet to provide a reliable working voltage for the electrical equipment in the cabinet. This series of switching power supply has a wide voltage range, AC and DC voltage input adaptive; excellent overload capacity; strong output, -25...70 °C output power margin is abundant; conversion efficiency up to 91%, etc., to meet the secondary circuit The more advanced instrumentation, control equipment, and automation equipment are required for power supply. In addition, the Weidmüller PRO-M series switching power supplies are small in size and can be mounted side by side without any gaps, saving space in the cabinet. The use of Weidmüller PRO-M series switching power supplies in the Jinping hydropower station project can ensure stable system performance, high precision, and greater safety and reliability, providing reliable power protection for the system's production and other loads, and also for control systems. Automation has laid a solid foundation.
Weidmüller PRO-M Switching Power Supply Products and Applications in the Cabinet
Reliable and effective isolation
The Weidmüller DRM relay was also used in the project's auxiliary control system for isolation between the PLC and the current digital signal. The PLC itself has a transistor output, but its capacity is small (500mA) and it is difficult to directly drive the load. Therefore, Weidmüller DRM series intermediate relays are required as the interface between the relay output of the PLC and the load. The PLC comes with the transistor to drive the Weidmüller DRM relay coil, and then the Weidmüller DRM series relay contacts. Point to drive the load, thereby achieving effective isolation of the PLC's own transistor and load. Weidmüller DRM series relays have high sensitivity, test lock handle, mechanical indication window, contact indication window, multiple international certifications, long service life of up to 250,000 times, pluggable function modules, and high cost performance It is favored by customers because of many features. Weidmüller's DRM series of intermediate relays are small in size, suitable for compact space in cabinets, and suitable for various industrial controls. They can achieve electrical isolation and signal conversion between controllers and sensors and actuators.
Weidmüller DRM Series Intermediate Relay Products and Cabinet Applications
High-efficiency overvoltage protection
Weidmüller MCZ series surge protectors are also used in the auxiliary control system of this project to provide reliable overvoltage protection for key signals. In order to prevent overvoltage damage to the system equipment, all threatened interfaces (signal input, etc.) must be connected to a surge protector. Weidmüller MCZ series surge protectors use varistor technology. Because of its non-linear characteristics, low residual voltage and large flow capacity, the technology is widely used in signal lightning protection. Weidmüller MCZ series surge protectors protect the 4-20mA signal loop of the control system, prevent surges from entering the control system through the loop and cause damage to the system, so it is suitable for the protection of sensor/actuator systems. In addition, this series of products also has ultra-thin design, easy installation, does not occupy the space inside the cabinet, high protection grade, and is very suitable for use in the control cabinet.
Weidmüller MCZ series surge protector
In addition to the above products, the Weidmüller WAVE II series signal isolators and the WF and WFF high-current series terminal blocks are also widely used in this project, providing an integrated electrical connection solution for this project.
WAVE II Series Signal Isolators and Cabinet Applications
Weidmüller High Current Series Terminal Blocks Field Application Diagram
Integrated solutions such as Weidmüller switching power supply, relays, surge protectors, isolators and terminal blocks have been used in a large number of applications in the Jinping I and II hydropower stations, which can help the Jinping Hydropower Station achieve auxiliary and The monitoring system has laid a solid foundation for safe, reliable and efficient operation. With the vigorous development of China's power industry, we are expecting Weidmüller to bring more efficient, practical, reliable and safe solutions to the Chinese power industry, opening a new chapter together with the Chinese power industry.