Documents Substation Metering & Protection with SEL-351 11kV Cast-Resin Current Transformer per IEC 61869-2 May 9, 2026 / May 2, 2026 by tianming Introduction to the SEL-351 Current Transformer The SEL-351 is a high-precision, cast-resin insulated current transformer (CT) engineered for dual-duty applications in medium-voltage power systems—specifically designed to meet the stringent accuracy and reliability demands of both revenue-class metering and protective relaying at a nominal system voltage of 11 kV. Unlike legacy oil-filled or gas-insulated CTs, the […] Read more »
Documents Selecting LA-10Q 11kV CT: Outdoor/Indoor Cast-Resin Current Transformer for IEC 61869 Metering & Protection May 8, 2026 / April 22, 2026 by tianming Introduction The LA-10Q current transformer is a critical component in medium-voltage power systems, specifically engineered for reliable and accurate current measurement and protection in 10 kV networks. Designed to meet stringent international standards such as IEC 61869 and GB/T 20840, the LA-10Q ensures high performance under demanding electrical and environmental conditions. Its robust epoxy resin […] Read more »
Documents MER-1 11kV Cast-Resin Current Transformer for Substation Metering & Protection – IEC 61869-2 Compliant May 8, 2026 / May 2, 2026 by tianming For Substation Metering & Protection: JDJ-3 11kV Cast-Resin Voltage Transformer per IEC 61869-3 Introduction to the JDJ-3 Voltage Transformer The JDJ-3 is a single-phase, indoor-type cast-resin voltage transformer (VT) engineered for precise voltage transformation in 11kV (IEC-rated) or 10kV (domestic system) medium-voltage networks. Designed in strict accordance with IEC 61869-3 and GB/T 20840.3, it serves […] Read more »
Documents IEC-Certified LA-10Q Current Transformer—11kV Cast-Resin for Indoor/Outdoor Metering & Protection Class May 8, 2026 / April 22, 2026 by tianming Introduction The LA-10Q Current Transformer is a high-precision, resin-cast instrument transformer specifically engineered for accurate current measurement and protection in medium-voltage power systems operating up to 10 kV. Designed in compliance with international standards including IEC 61869-1 and IEC 61869-2, the LA-10Q ensures reliable performance under demanding electrical and environmental conditions commonly encountered in industrial, […] Read more »
Documents Instrument Transformer Transient Response & Relay Coordination: CT Saturation, CVT TVR & Protection Performance Guide (IEC 61869) May 8, 2026 by tianming Instrument Transformer Transient Response & Relay Coordination: CT Saturation, CVT TVR & Protection Performance Guide (IEC 61869) Meta Description: Comprehensive guide on instrument transformer transient response and relay coordination. Covers CT saturation mechanisms, CVT transient voltage response (TVR), relay performance during faults, and compliance with IEC 61869 and IEEE C57.13. Includes calculation methods, selection criteria, […] Read more »
Documents LAJ-10Q 11kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified May 7, 2026 / April 27, 2026 by tianming LAJ-10Q 11kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified Introduction to the LAJ-10Q Current Transformer The LAJ-10Q is a high-voltage, indoor-type cast-resin current transformer (CT) engineered for precise current measurement and robust protection functionality in 11kV (IEC-rated) or 10kV (domestic system equivalent) medium-voltage networks. Designed in strict compliance with IEC […] Read more »
Documents 11kV Substation Protection: UNKNOWN Cast-Resin Current Transformer Compliant with IEC 61869-2 May 7, 2026 / May 2, 2026 by tianming UNKNOWN 11kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified Introduction to the UNKNOWN Current Transformer The UNKNOWN 11kV cast-resin current transformer (CT) is engineered for high-reliability applications in medium-voltage power systems, specifically designed to meet the dual demands of accurate metering and robust protective relaying. This device operates on the […] Read more »
Documents Compliant 11kV LZZBJ9-10 Cast-Resin Current Transformer Meets IEC 61869-2 for Substation & Grid Applications May 7, 2026 / April 24, 2026 by tianming LZZBJ9-10 11kV Cast-Resin Current Transformer – IEC 61869-2 Compliant Applications LZZBJ9-10 11kV Cast-Resin Current Transformer – Application Scenarios per IEC 61869-2 Introduction The LZZBJ9-10 11kV current transformer (CT) is a cast-resin insulated instrument transformer designed for accurate current measurement and protection in medium-voltage electrical systems operating at the standardized IEC voltage level of 11kV. Developed […] Read more »
Documents Current & Voltage Transformers in Ring Main Units (RMU) & Switchgear: Integration, Selection & Testing Guide (IEC 62271-200) May 7, 2026 by tianming Current & Voltage Transformers in Ring Main Units (RMU) & Switchgear: Integration, Selection & Testing Guide (IEC 62271-200) Meta Description: Comprehensive guide on integrating current and voltage transformers in Ring Main Units (RMUs) and medium-voltage switchgear. Covers sensor types, space constraints, protection schemes, testing procedures, and compliance with IEC 62271-200 and IEC 61869. Includes selection […] Read more »
Zero Sequence CT LXK-φ80, φ100, φ120, φ180-φ260 Split-Core Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXK-φ80/φ100/φ120/φ150/φ180/φ200/φ240/φ260 split-core zero sequence current transformers for indoor cable earth fault protection and residual current monitoring. The open-type epoxy cast-resin CT can be installed around existing cable groups, with 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output, 10P5 to 10P20 protection classes and 1VA to 15VA output options. Read more »
Zero Sequence CT LXK Series Epoxy Resin Cast Unitary Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXK series indoor epoxy resin cast unitary zero sequence current transformers for cable earth fault protection in small-current grounding systems up to 35kV. Models cover φ80 to φ260 window sizes, with 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output and 10P5 to 10P20 protection classes. Standard type is integrated non-split; split clamping structure can be customized. Read more »
Zero Sequence CT LXC-10/155-300-60/80 Double Cable Track Type Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXC-10/155-300-60 and LXC-10/155-300-80 indoor cast-resin double cable track zero sequence current transformers for grouped cable earth fault protection and residual current monitoring. Split-core resin-cast structure allows installation around existing cable groups, with 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output, and 10P5/10P10 protection classes. Read more »
