XJ Electric WGB-872 Microcomputer Motor Protection Device
1. Device Overview
The WGB-870 series microcomputer protection and control devices are developed by XJ Electric, drawing on decades of successful experience in the manufacturing of secondary equipment for power systems. Designed specifically for power distribution systems, these cost-effective devices integrate protection, measurement, control, and communication functions. They are suitable for protecting lines, bus-tie (sectionalizing), capacitors, generators, station transformers, and other equipment at various voltage levels of 10KV and below in different industries.
Protection Functions
1 Differential Quick-break Protection 
2 Percentage Differential Protection 
3 FC Circuit 
4 Two-stage Phase Overcurrent Protection 
5 Phase Overcurrent Stage III Protection 
6 Inverse Time Overcurrent Protection 
7 Negative Sequence Stage I Protection 
8 Negative Sequence Stage II Protection 
9 Zero-sequence Overcurrent Protection 
10 Motor Starting Protection 
11 Overheat Protection 
12 Overvoltage Protection 
13 Underfrequency Load Shedding 
14 Undervoltage Protection 
15 Overload Protection 
16 1~4 Non-electrical Quantity Protection 
Auxiliary Functions
17 Control Circuit Anomaly Detection 
18 Spring Not Charged Detection 
19 TV Anomaly Detection 
20 TA Break Detection 
21 Trip Position Anomaly Detection 
22 Differential Current Over-limit Detection 
23 Waveform Recording 
Measurement and Control Functions
24 Teleindication Data Upload 
25 Normal Circuit Breaker Remote Opening/Closing 
26 Analog Telemetry Data Upload 
1.2 Product Features
A. Utilizes a 32-bit high-performance embedded microprocessor with large-capacity RAM and Flash Memory; employs an SOC solution for strong data processing, logical operation, and information storage capabilities, high operational speed, and reliability;
B. Integrated fully enclosed metal chassis design with strong dustproof, anti-corrosion, and contamination resistance capabilities;
C. Platform-based overall core design for relatively convenient maintenance, significantly reducing the downtime of protected objects;
D. Flexible support for AC and DC power supply for the device and operational power {AC220/DC220/110V};
E. Ethernet and RS485 communication modes, supporting various user networking requirements;
F. Powerful message storage function, capable of recording up to 100 recent protection operation reports, 100 various event reports, and 20 fault waveforms;
G. IEC-60870-5-103 and Modbus communication protocols, facilitating device integration into DCS systems and automation systems from other manufacturers.