WBT-821_Xuji Microcomputer Backup Automatic Switching Device

1. Introduction to the device

The WBT-820 series microcomputer backup automatic switching device adopts advanced visual logic configuration (PLC) method, which visualizes the logic configuration on the PC, and realizes the backup power automatic switching logic required by various operating modes (environments) by calling the corresponding functional components in the functional component library; The various components in its functional component library have undergone repeated testing and are safe and reliable.

The WBT-821 device is equipped with four types of sectional switch backup self switching modes and overload function after backup switching (main transformer), and is equipped with sectional switch protection functions including two-stage compound voltage blocking current protection, one-stage zero sequence current protection, three-phase primary reclosing, current acceleration, zero sequence acceleration (the acceleration section also serves as charging protection), etc; Equipped with self checking and measurement functions such as TV disconnection detection, position detection, power measurement, pulse measurement, etc; Suitable for segmented protection, measurement and control, and backup automatic switching of voltage levels of 110kV and below.

The WBT-822 device hardware is equipped with 8 TVs and 6 TAs, which can achieve four types of incoming line automatic switching function and two types of segmented (bridge) switch automatic switching function through logical configuration; Suitable for automatic switching of backup power supply for two incoming lines with dual busbars or single busbars operating in sections at voltage levels of 220kV and below.

1.1. Please refer to Table 1-1 for functional configuration

Table 1-1: Functional Configuration

1.2. Main features

1. The reinforced unit chassis is designed to resist strong vibration and interference, and is particularly suitable for harsh environments. It can be installed separately on the switchgear for operation.

2. All integrated circuits are made of industrial products, ensuring high stability and reliability of the device.

3. Using 32-bit DSP as the protection CPU, configured with large capacity RAM and Flash Memory; Strong data operation, logical processing, and information storage capabilities, high reliability, and fast running speed.

4. Using 16 bit A/D as data acquisition, data collection is conducted 24 hours a week to ensure high measurement accuracy.

5. Adopting graphical LCD display and fully Chinese menu style human-computer interaction; It can display various operating statuses and data in real time, with detailed and intuitive information, and easy operation and debugging.

6. It can independently set 8 sets of protection settings, and the switching of the setting area is safe and convenient.

7. Large capacity information recording: capable of storing no less than 100 recent historical reports, with action parameters, power failure maintenance, and easy accident analysis.

Adopting DL/T667-1999 protocol and equipped with RS-485 communication interface; Networking is economical and convenient, and can directly communicate with microcomputer monitoring or protection management machines.