NEUTRONPower Distribution & New Energy
Technical knowledge library
Practical notes for transformers, switchgear, distribution assemblies and specification decisions for export projects.
Showing 13–24 of 42 published guides.
Every guide remains available through the numbered topic pages and its own permanent article URL.
Low-voltage switchgear / Code guide
Decode common low-voltage switchgear designations and compare fixed, withdrawable and modular assemblies by current, short-time withstand, serviceability and cost.
Power Distribution / Procurement guide
Incoterms define who arranges and pays for transport, where risk transfers from seller to buyer, and who handles customs. For solar BOS orders, the term you choose directly changes the quoted price and the number of logistics tasks on your side. The same equipment can differ in landed cost across terms.
Power Distribution / Procurement guide
A pre-shipment inspection (PSI) verifies that the goods match the order before the container is sealed. Finding a defect at the factory is cheap; finding it at the project site is expensive. A structured checklist turns inspection from a formality into a gate.
Power Distribution / Procurement guide
Suppliers quote what they can see. An enquiry with complete BOM details, ratings and commercial terms returns accurate, comparable pricing in one round. A vague enquiry returns a vague quote, or no quote at all. The checklist below closes that gap.
Power Distribution / Technical guide
Transfer switches come in two fundamentally different technologies: the electromechanical automatic transfer switch (ATS) and the static transfer switch (STS). Both move a load from a preferred supply to a standby supply, but they do it with very different speed, cost and maintenance profiles. This guide compares the two routes and gives a decision path based on how long your load can tolerate an interruption.
Power Distribution / Technical guide
Automatic transfer switching equipment (ATSE) has been used for dual-supply changeover for decades. Before a dedicated standard existed, contactors, breakers and isolating switches were all pressed into this duty. Since the publication of the Chinese standard GB/T 14048.11 (the parallel of IEC 60947-6-1), ATSE has become a defined low-voltage category used for automatic transfer between two supplies to keep critical loads fed. This article explores the standard, the internal structure and the field-selection rules that separate a dependable unit from a convenience product.
Power Distribution / Technical guide
China’s railway network has grown rapidly, and with operating speeds rising, the supply reliability required by railway communication and signalling — a first-class load — has become stricter. When the supply side fails, train operations are directly affected. This article reviews how Chinese railway projects arrange dual-power transfer for signalling loads, the debates that still occur in design, and the practical answers that have emerged for selecting transfer switchgear.
Power Distribution / Technical guide
A fire-fighting power supply is only as reliable as its automatic transfer switch (ATS) control cabinet — the unit that moves the fire pumps, emergency lighting and alarm system to a standby feed the moment the mains supply fails. In many jurisdictions this cabinet is a mandatory item for fire acceptance in hospitals, metro stations, malls and high-rise buildings. This guide covers the core parameters, the compliance marks that separate genuine units from look-alikes, and the sizing and integration decisions that determine whether the cabinet actually works when it is needed.
Power Distribution / Technical guide
An automatic transfer switch (ATS) keeps critical loads running when the preferred utility supply fails, switching them to a standby feed within its rated transfer time. In low-voltage distribution, transfer switches are built in two classes — PC-class and CB-class — and choosing between them is a recurring design decision that affects reliability, transfer speed, short-circuit duty and code compliance. This guide explains the mechanical and electrical reasons behind each class and gives a practical selection path for engineers, panel builders and procurement teams.
Power Distribution / Technical guide
An automatic transfer switch (ATS) fails rarely, but when it does, the repair must be done to a standard — not by feel. This guide organizes the diagnosis of the three most common failure patterns (contact-system failure, false protection trips and abnormal heating) around measurable thresholds, then sets out the repair, calibration and verification procedures that keep the unit dependable after it returns to service.
Power Distribution / Technical guide
An automatic transfer switch (ATS) sits idle for most of its life and is expected to work perfectly the one time it is needed. Field experience shows that most transfer-switch failures are not component catastrophes — they are wiring errors, loose connectors, wrong settings and overlooked maintenance. This guide walks through the five most common fault patterns, their likely causes and the correct fix, plus a preventive checklist that keeps the unit ready.
Power Distribution / Technical guide
Continuous-process plants — smelters, chemical lines, paper mills — treat the electrical feed as part of the production process. A voltage sag, often called a dip or 晃电 in Chinese practice, is the invisible killer of supply continuity: when the sag crosses a device-specific depth and duration threshold, sensitive equipment trips and the line stops. This article walks through a real smelter case — a sag that stopped a production line for more than two hours — and the two-layer remedy applied: a fast bus transfer on the supply side and dip ride-through modules on the load side.