ALLPCB
PoE Power Standards and Technical Parameters
Technical overview of PoE power delivery covering PSE/PD roles, detection/classification, wiring alternatives (A/B), pair polarity and four-pair IEEE 802.3bt.
Calculating Voltage Drop in Power Transmission
Explains voltage drop in power systems, factors like resistance, inductance, length and temperature, and methods to calculate voltage drop in transmission systems.
How to Read a Smart Electricity Meter
Guide to reading smart meters: view data via mobile app or TV, and apply CT ratio for CT-connected meters to compute accurate energy consumption.
Inverter Islanding: Causes and Protection Measures
Explains inverter islanding: causes, safety risks, and suppression methods including anti-islanding standards, detection devices, protection settings and maintenance.
Power Room Shutdown and Re-energization Sequence
Step-by-step shutdown and re-energization procedures for distribution switchgear, specifying low-voltage vs high-voltage isolation order, circuit breaker operations and fault recovery.
Differences Between Smart Grids and Traditional Grids
Compare smart grid and traditional grid: definitions, architecture, reliability, efficiency, and integration of distributed generation and renewable energy.
Grid Harmonics and Power Quality Effects
Technical overview of grid harmonics: definitions, causes, key terms and THDu limits under China's standard GB/T 14549-1993 for power quality assessment.
Smart Grid Features, Architecture and Key Advantages
Smart grid overview of architecture, components and functions, highlighting energy efficiency, reliability, adaptive control, IoT/5G communications and renewable integration.
Smart Grid Devices and Components
Technical overview of smart grid architecture and devices, covering intelligent substations, smart meters, smart terminals, energy storage systems, and smart EV charging.
Breaker Categories and 10/350, 8/20 Surge Parameters
Technical overview of breakers (CAT A/B), RCBO/RCCB/RCD, surge protector waveforms (10/350, 8/20), IP ratings for switchgear, and transformer hum causes and mitigation.