Zhuhai Sichuang ST280G-T Universal Protection Device

Overview
1.1 Application
The ST280G-T Universal Protection Device is a microprocessor-based protection unit primarily developed for 10KV and below voltage level applications, serving as an economical protection solution. It offers four protection types, providing corresponding protection functions for primary equipment such as incoming/outgoing lines, transformers (for plant/station use), motors, and capacitors.
1.2 Features
? 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.
? Provides four equipment protection types for flexible on-site application by users.
? Offers primary value/secondary value display mode selection to accommodate different user preferences.
? Supports 50Hz/60Hz system selection, expanding the device's application scope.
? Comprehensive protection function configuration allows flexible enabling/disabling of various protections, with programmable output configuration.
? 6 channels of intelligent digital inputs with user-definable functions for convenient on-site wiring flexibility.
? Basic measurement and control functions, capable of measuring electrical parameters such as voltage, current, active power, reactive power, apparent power, power factor, and frequency.
? Large-screen LCD display interface (160*80, 10*5 Chinese characters), multi-layer menu display, and extremely user-friendly human-machine interface.
? Large-capacity FLASH memory records up to 60 historical events with data retention during power loss.
? Comprehensive dynamic and static self-test functions monitor device operational status in real-time, ensuring reliability.
? Equipped with RS-485 communication bus interface and standard communication protocol.

Chapter Technical Performance Specifications
2.1 Operating Environmental Conditions
2.1.1 Ambient Temperature: Operating temperature -20°C to 60°C
Storage temperature -40°C to 85°C
2.1.2 Relative Humidity: 5% to 95%
2.1.3 Atmospheric Pressure: 70 KPa to 110KPa
2.1.4 Altitude: Not exceeding 3500m
2.2 Electrical Technical Parameters
2.2.1 Rated Data: AC voltage (provided at order): 100V or 220V
AC current (provided at order): 5A or 1A
Frequency: 50Hz/60Hz
Power supply (provided at order): AC220(110)V, ±20%
DC220(110)V, ±20%
DC48V, ±20%
DC24V, ±20%
2.2.2 Overload Capacity: Voltage circuit Continuous operation------2Ue
Current circuit Continuous operation------2Ie
10s--------------10Ie
1s---------------40Ie
2.2.3 Power Consumption: Power supply not exceeding 5W
AC input circuit not exceeding 0.5VA/channel
2.2.4 Measurement Range: Voltage 0.01Ue - 2Ue
Current 0.1Ie - 20Ie
Zero-sequence current 0.01A - 10A
2.2.5 Measurement Accuracy: Voltage <1%
Current <1%
Zero-sequence current <0.005A
2.2.6 Protection Setting Range: Current 0 - 20Ie Step 0.01A
Voltage 0 - 2Ue Step 0.1V
Time 0 - 600S Step 0.01S

2.2.7 Protection Operation Time: All protection inherent operation time not exceeding 35ms at 1.5 times setting value
2.2.8 Digital Input Circuit: Internal or external power supply; when external power is provided, voltage type typically matches device power supply, current consumption 2mA
2.2.9 Output Contacts: Contacts can continuously carry DC220V, 5A current
2.2.10 Communication Interface: RS-485 interface