PT cabinets with display panels

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PT cabinets refer to voltage transformer cabinets.

PT cabinets with display panels have the following features and advantages:

### Basic Functions of the Display Panel

- **Real-time Data Display**: It can intuitively display the voltage values on the secondary side of the voltage transformer, including parameters such as phase voltages and line voltages, enabling operators to understand the voltage status of the system in real time. For example, in a 10kV PT cabinet, the display panel can accurately display the effective values of each phase voltage to help determine whether the system is within the normal voltage range.

- **Operation Status Indication**: Through indicator lights of different colors or text displays, it clearly shows the operation status of the equipment inside the PT cabinet, such as the working status of the voltage transformer, the on-off status of the fuse, the operation status of the arrester, etc. For instance, when the green light is on, it indicates that the voltage transformer is operating normally, and when the red light is on, it may indicate that a fault or abnormality has occurred.

- **Fault Alarm Prompt**: When a fault occurs inside the PT cabinet, such as a short circuit of the voltage transformer, a blown fuse, overvoltage, etc., the display panel will issue audible and visual alarm signals to remind operators to handle it in a timely manner, improving the safety and reliability of the system.

Advanced Functions of the Display Panel

- **Expansion of Measurement Functions**: Besides basic voltage measurement, some advanced display panels can also measure and display other relevant parameters, such as frequency, power factor, active power, reactive power, etc., providing more comprehensive data support for the operation analysis of the power system.

- **Data Recording and Storage**: It has a data recording function and can record historical data such as voltage data and fault information within a certain period of time. These data can be stored in the internal memory or uploaded to the monitoring system through the communication interface, facilitating post-event analysis and fault troubleshooting by operators.

- **Communication Function**: Equipped with communication interfaces, such as RS-485, Ethernet, etc., it can achieve communication connections with substation automation systems or other monitoring equipment, and transmit the operation data and status information of the PT cabinet to the remote monitoring center in real time, facilitating the realization of remote monitoring and centralized management.

Hardware Composition and Principle

- **Display Screen**: Usually, liquid crystal display (LCD) or light-emitting diode display (LED) is adopted. The LCD display has the advantages of clear display, low power consumption, and long service life, and is suitable for displaying various complex graphics and text information. The LED display has the characteristics of high brightness, large viewing angle, and fast response speed, and has better visual effects in outdoor or brightly lit environments.

- **Control Circuit**: It is responsible for controlling and driving the display screen, receiving signals from the secondary side of the voltage transformer, and converting them into digital signals or analog signals suitable for display on the screen. The control circuit can also implement functions such as switching the display content, adjusting the brightness, and setting the alarm threshold.

- **Sensors and Signal Acquisition Circuits**: They are used to collect various physical quantity signals inside the PT cabinet, such as voltage signals, current signals, temperature signals, etc. After the sensors convert these physical quantities into electrical signals, the signal acquisition circuits perform processing such as amplification, filtering, and analog-to-digital conversion. Finally, the processed signals are transmitted to the control circuit for display and processing.

### Application Scenarios and Advantages

- **Substation**: In a substation, the PT cabinet with a display panel can provide operators with intuitive and comprehensive equipment operation information, facilitating them to monitor and adjust the voltage status of the substation in real time to ensure the stable operation of the power system. Meanwhile, through the communication function, it is also possible to achieve unattended or minimally attended operation of the substation, reducing operating costs.

- **Industrial Enterprise Distribution Room**: For the distribution rooms of industrial enterprises, the display panel can help electrical maintenance personnel understand the operation status of the PT cabinet in a timely manner, quickly detect and handle faults, reduce power outage time, and improve production efficiency. In addition, the data recording and storage functions also help enterprises analyze and manage power consumption, optimize power usage plans, and reduce power consumption costs.

- **Smart Grid**: With the development of the smart grid, the PT cabinet with a display panel, as an important part of the smart grid, can better meet the requirements of grid intelligence and automation. Through the interconnection and interoperability with other smart devices, it can achieve comprehensive perception, real-time monitoring, and intelligent control of the power system, improving the reliability, flexibility, and economy of the power grid.