Echo Knowledge

One of the core challenges of Solid-State Transformers (SST) is that the voltage rating of a single power semiconductor device is far insufficient to directly handle medium-voltage distribution networks (e.g., 10 kV). Addressing this voltage limitation does not rely on a single technology, but rathe

What is SST? SST stands for Solid-State Transformer, also known as Power Electronic Transformer (PET). From the perspective of power transmission, a typical SST connects to a 10 kV AC grid on the primary side and outputs approximately 800 V DC on the secondary side. The power conversion process gene

What Is the Future of Intelligent Electrical Rooms? The Future of Intelligent Electrical Rooms Intelligent electrical rooms represent a significant upgrade from traditional setups by leveraging technologies such as the Internet of Things (IoT), big data analytics, and cloud computing. These advancem

When Actual Grid THD Exceeds Limits (e.g., Voltage THDv 5%, Current THDi 10%), It Causes Organic Damage to Equipment Across the Entire Power Chain — Transmission → Distribution → Generation → Control → Consumption. The Core Mechanisms Are Additional Losses, Resonant Overcurrent, Torque Fluctuations,

Air-insulated ring main units (RMUs) are defined in contrast to compact gas-insulated RMUs. Early air-insulated RMUs used vacuum or puffer-type load switches from VEI, as well as gas-generating load switches. Later, with the widespread adoption of the SM6 series, it became the mainstream solution fo

The solid-state transformer (SST), also known as a power electronic transformer (PET), uses voltage level as a key indicator of its technological maturity and application scenarios. Currently, SSTs have reached voltage levels of 10 kV and 35 kV on the medium-voltage distribution side, while on the h

1. Induced Lightning Overvoltage Induced lightning overvoltage refers to the transient overvoltage generated on overhead distribution lines due to nearby lightning discharges, even when the line is not directly struck. When a lightning flash occurs in the vicinity, it induces a large amount of charg

(1) Generator Protection: Generator protection covers: phase-to-phase short circuits in stator windings, stator ground faults, inter-turn short circuits in stator windings, external short circuits, symmetrical overload, stator overvoltage, single- and double-point grounding in the excitation circuit

What Is Common Grounding? Common grounding refers to the practice where a system’s functional (working) grounding, equipment protective grounding, and lightning protection grounding share a single grounding electrode system. Alternatively, it may mean that grounding conductors from multiple electric

When installing an arc suppression coil, it is important to identify the conditions under which the coil should be taken out of service. The arc suppression coil should be disconnected under the following circumstances: When a transformer is being de-energized, the neutral-point disconnector must be

1.Reasonable Use of Transformers Transformers should be selected with flexible winding configurations according to the power consumption characteristics of industrial enterprises, and load adjustments should be made promptly based on each transformer’s load rate to ensure operation at optimal loadin

A shielding enclosure is a metallic structure made of conductive or magnetic materials in various shapes, designed to confine electromagnetic energy within a defined space and suppress radiated interference. A typical shielding enclosure consists of a conductive fabric layered over foam plastic, wit