Why Power Plants Step Up Voltage at Substations

Explains substations' role in the power supply chain: voltage transformation, step-up/step-down functions, loss reduction, substation siting, and ELF field basics.

Live Neutral in Distribution Room: Troubleshooting Steps

Diagnosis and remedies for a live neutral in distribution rooms: causes, sequential disconnection, grounding checks and earth resistance fixes.

High-Voltage Switchgear: Internal Structure

Overview of high-voltage switchgear: enclosure, vacuum circuit breaker, withdrawable truck, five safety interlocks, operation procedures, tests and fault diagnosis.

Comprehensive Design Plan for Power Distribution Systems

Power distribution for LED screens: calculate screen power, size the distribution cabinet, select three-phase five-wire bus conductors and allocate cabinet loads.

10kV Switchgear Control and Protection

Overview of 10 kV switchgear components and troubleshooting, covering isolating switches, vacuum circuit breakers, protection relays, insulation and mechanical faults.

New Medium-Voltage Switchgear Solution

Grid digital transformation and fully automated switchgear: AI-enabled digitized devices for fault detection, protection, and automated distribution network control.

What Are the Discs Inside a Distribution Cabinet?

Identification and technical overview of a three-phase autotransformer in a distribution cabinet, covering working principle, structural features, and voltage regulation use cases.

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.

Firestopping Requirements for Cable Trays and Wall/Slab Penetrations

Technical guide to firestopping cable tray and slab penetrations in electrical shafts; specifies materials, packing limits, waterstop heights and installation sequence.

Two Automation Modes for Central Control Stations

Technical overview of central control station for unmanned substations: compares hierarchical management mode and centralized control mode, with SCADA/dispatch integration.