Partial discharge is one of the hidden dangers that accelerate the aging of power cable insulation. Unlike factory laboratory tests, on-site partial discharge detection faces complex interference from surrounding electrical equipment, grounding systems and ambient noise. Many cable faults in 10kV and 35kV distribution networks start from tiny partial discharge defects that are not discovered
The heating cycle test (often referred to as the thermal load cycle test) is a key type test for extruded-insulation power cables. It is specified under three separate IEC standards by voltage class: IEC 60502-2 for medium voltage cables from 6 kV to 30 kV, IEC 60840 for high voltage cables above 30 kV up
Solar PV DC cable is a special cable designed for the DC side of photovoltaic systems, used to connect solar modules, combiner boxes, inverters and DC distribution cabinets. Unlike ordinary power cables, PV cables work under long-term UV exposure, large temperature changes and continuous DC voltage. Poor cable selection will lead to jacket cracking, insulation
Cable Insulation Resistance Test: Procedure, Standards & Acceptance Guide Insulation resistance testing is the most common field check performed before energizing a new cable and during periodic maintenance. It measures how well the insulation blocks leakage current between conductors, and between conductor and shield or armour. A low or falling insulation resistance reading reveals moisture
Buried power cables deliver reliable power for industrial, utility and renewable energy projects. Many buyers focus on conductor and insulation performance but overlook the outer cable sheath. Sheath corrosion is a silent failure mode that gradually damages the outer jacket, allows moisture and soil chemicals to penetrate, and eventually triggers insulation breakdown and unexpected outages.
Copper and aluminum raw material prices are core indicators for cable production and international quotation. Daily price fluctuations directly affect the material cost and pricing strategy of cable orders. On October 28, 2026, the non-ferrous metal market showed divergent performance. LME copper is the primary reference for global buyers, while domestic spot copper price moved
Today’s Copper & Aluminum Spot Prices Data source: Yangtze Metal Network, Guangdong spot market, LME and SHFE. Item Price Change LME 3M Copper USD 14440/t -33 USD/t 1# Electrolytic Copper (Yangtze Spot) RMB 111010/t +470/t Oxygen-free Copper Wire (Hard) RMB 112170/t +470/t Enameled Wire RMB 116280/t +470/t A00 Aluminum Ingot (Yangtze) RMB 23930/t +40/t 1#
Partial discharge is a localized electrical breakdown inside cable insulation that fails to fully connect conductors. Unlike a short circuit that causes immediate outage, partial discharge releases tiny sparks continuously. These micro-discharges gradually erode XLPE insulation, expand voids and cracks, and eventually trigger cable failure. It is one of the hidden early defects for medium
Update Date: July 06, 2026 Copper price is the core factor affecting power cable costs and export FOB quotations. We update the latest LME international copper price and China domestic spot copper price every working day to provide accurate cost reference for global electrical contractors and cable buyers.1. Global LME Copper Price (International Export Benchmark)LME
