1. Introduction to the device

The WDH-820 series microcomputer motor protection device is suitable for the protection and measurement of medium and high voltage asynchronous motors with voltage levels of 3kV to 10kV. It can be directly installed on the switchgear or installed in a group screen. The WDH-821 microcomputer motor protection is used for the protection of small and medium-sized asynchronous motors below 2000 kW; WDH-822 and WDH-823 microcomputer motor protection are used for the protection of large asynchronous motors of 2000kW and above.

1.1. Function configuration: Please refer to Table 1-1

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.