XJ Electric WGB-871A Microcomputer-Based Comprehensive Protection Device

1 Device Introduction

1.1 Application Scope
The WGB-871A microcomputer-based comprehensive protection device is suitable for various power distribution and consumption sites with voltage levels of 10kV and below. The device adopts multiple adaptive technologies and design concepts, facilitating engineering selection and on-site application. It can be flexibly configured according to the application scenario, with protection objects including line protection, plant transformer protection, capacitor protection, motor protection, and busbar (section) charging protection. Line protection is applicable for lines and feeder protections at 10kV and below voltage levels; plant transformer protection is suitable for plant transformers, station service transformers, or grounding transformers at 10kV and below voltage levels; capacitor protection is used for shunt capacitors installed in power distribution and consumption sites at 10kV and below voltage levels; motor protection is designed for small and medium-sized asynchronous motors below 2MW at 10kV and below voltage levels;

Charging protection measurement and control device is applicable for busbar (section) charging protection at 10kV and below voltage levels.
1.2 Product Features
1. Wide-range working power supply design, compatible with both AC and DC.
2. Adopts advanced design concepts, with built-in five protection object functions supporting flexible switching.
3. Integrated chassis design, compact size, small footprint, suitable for installation in various cabinets.
4. Features graphical LCD Chinese display, menu-based operation, user-friendly.
5. Switch input uses high-voltage design, compatible with AC and DC, strong anti-interference capability.
6. Utilizes independent high-precision ADC, high protection accuracy, strong anti-interference capability.
7. Equipped with independent measurement function, power measurement accuracy up to class 0.5.
8. Relay output adopts matrix configuration, field programmable, easy to use.
9. Operating circuit compatible with AC and DC, adaptable to various operating mechanisms.
10. Standard RS485 and Ethernet communication interfaces, supporting IEC103, MODBUS, and other communication protocols.
11. 8 sets of protection settings, safe and convenient setting zone switching.
12. 4 groups totaling 400 report records, facilitating problem tracing and analysis.

13. Supports fault recording function, convenient for accident analysis.

1.3 Protection Configuration

Protection Functions
1 Three-stage overcurrent protection
2 Overcurrent acceleration protection
3 Overload protection
4 Inverse-time overcurrent protection
5 Two-stage charging protection

6 FC circuit lockout
7 Prolonged start protection
8 Overheat protection
9 Two-stage definite-time negative sequence protection
10 Inverse-time negative sequence protection
11 Zero-sequence stage I overcurrent protection
12 Zero-sequence stage II overcurrent protection
13 Zero-sequence stage III overcurrent protection
14 Low-voltage side zero-sequence definite-time
15 Low-voltage side zero-sequence inverse-time
16 Under-voltage load shedding protection
17 Under-frequency load shedding protection
18 Loss of voltage protection
19 Low voltage protection

20 Overvoltage protection
21 Zero-sequence overvoltage protection
22 Unbalanced current protection
23 Unbalanced voltage protection
24 Three-phase one-shot reclosing
25 4 non-electrical quantity protections