Zhuhai Sichuang ST280B-L Standby Power Automatic Transfer Device

Overview
1.1 Application
The ST280B-L Standby Power Automatic Transfer Device is a microprocessor-based protection device primarily developed for applications at 35KV and below voltage levels. It features four standby power automatic transfer modes and provides three-phase overcurrent protection functionality.
1.2 Features
1. Utilizes a highly integrated 32-bit microprocessor with on-chip bus architecture, employing high-performance, high-reliability, and highly integrated wide-temperature or industrial-grade components to ensure normal operation under harsh environmental conditions.
2. Offers four standby power automatic transfer modes for flexible on-site application.
3. Supports switching between Chinese and English interfaces, as well as selection of primary/secondary value display modes to accommodate different user preferences.
4. Provides 50Hz/60Hz system selection and supports busbar or incoming line voltage connection methods, expanding the device's application scope.
5. Comprehensive protection function configuration with flexible activation/deactivation options and programmable output settings.
6. Features 9 intelligent switch inputs with user-definable functions for convenient on-site wiring.
7. Includes basic measurement and control capabilities, monitoring electrical parameters such as line voltage, current, active power, reactive power, apparent power, power factor, and frequency.
8. Equipped with a large LCD display (160*160, 10*10 Chinese characters), primary wiring diagram display, and multi-layer menu interface for user-friendly operation.
9. Large-capacity FLASH memory stores up to 60 historical event records with data retention during power loss.
10. Operating circuit plugin supports both AC/DC universal operation and adaptive switching current functionality for broad compatibility.
11. Comprehensive dynamic and static self-test functions with online monitoring of device components to ensure operational reliability.
12. Includes RS-485 communication bus interface with standard communication protocol.

1.3 Product Series
The ST280B-L Standby Power Automatic Transfer Device is one model within the ST280-L series protection devices. The product series list is as follows:

1 ST280G-L Universal Protection Device Feeder, plant (station) transformer, motor, capacitor protection

2 ST280DF-L Differential Protection Device Generator, main transformer, motor, reactor differential protection
3 ST280DB-L Generator Backup Protection Device Medium/small generator stator backup protection
4 ST280DE-L Generator Rotor Ground Protection Device Medium/small generator rotor ground protection
5 ST280TB-L Main Transformer Backup Protection Device Main transformer single-side backup protection
6 ST280B-L Standby Power Automatic Transfer Protection Device Incoming line (or section) automatic transfer and restoration with section protection
7 ST280P-L PT Protection and Automatic Synchronizing Device Dual-bus voltage protection monitoring and PT automatic synchronization