WXH-823_Xuji Microcomputer Line Protection Device

Introduction to the device

The WXH-823 microcomputer line protection device is a complete set of line protection devices with fiber optic current differential protection, current voltage protection, and three-phase primary reclosing as the basic configuration. It is mainly suitable for non directly grounded systems or small resistance grounded systems with voltage levels of 66kV and below.

1.1. Function configuration:

L Protection function

1) Fiber optic current differential protection

2) Three stage current and voltage direction protection (timed limit, inverse time limit optional)

3) Overcurrent acceleration protection (front acceleration, rear acceleration optional)

4) Three phase one-time reclosing (optional for checking synchronization and no voltage)

5) Low frequency load shedding protection

6) Zero sequence current protection

7) Overload protection

8) Low voltage protection

9) TV disconnection alarm

10) TA disconnection alarm

11) Control circuit abnormal alarm

Measurement and control function

1) 8-channel remote signal input acquisition, device remote signal displacement, accident remote signal

2) Normal circuit breaker remote control opening and closing, low current grounding detection remote control opening and closing

3) Telemetry of analog quantities such as Ia, Ib, Ic, Ua, Ub, Uc, P, Q, f, etc

4) Statistics of switch accident opening and closing times and event SOE, etc

5) Fault recording

6) 4-channel pulse input

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.

8) 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.