Documents SEL-351 11kV Cast-Resin Voltage Transformer for Substation Metering and Protection – IEC 61869-3 Certified May 12, 2026 / May 2, 2026 by tianming SEL-351 11kV Cast-Resin Voltage Transformer for Substation Metering and Protection – IEC 61869-3 Certified Introduction to the SEL-351 Voltage Transformer The SEL-351 is a precision-engineered, cast-resin insulated voltage transformer (VT) designed for accurate voltage measurement and reliable protective relay operation in medium-voltage power systems rated at 11kV (IEC standard), equivalent to 10kV in domestic Chinese […] Read more »
10KV Current Transformer 3kV-12kV Indoor CTs LZZBJ9-12B, 10B, 10kV-12kV Epoxy Resin Cast Current Transformer May 12, 2026 / July 20, 2026 by tianming LZZBJ9-10B, LZZBJ9-12B 10kV, 12kV indoor epoxy resin cast fully enclosed current transformer for 10kV, 11kV and 12kV medium-voltage switchgear. Designed for current measurement, electric energy metering and relay protection, with primary lead-out boards, bottom mounting inserts, 1A/5A secondary output, metering/protection accuracy combinations and project-based short-circuit withstand ratings. Read more »
3kV-12kV Indoor CTs 10KV Current Transformer LZZBJ9-12C1, C2 Epoxy Resin Cast Current Transformer, 10kv–12kv May 12, 2026 / July 20, 2026 by tianming LZZBJ9-10C1, LZZBJ9-10C2, LZZBJ9-12C1 and LZZBJ9-12C2 indoor epoxy resin cast fully enclosed post-type current transformers for 10kV, 11kV and 12kV medium-voltage switchgear. Designed for current measurement, energy metering and relay protection, with single or double ratio options, 5A/1A secondary output, 0.2S/0.5/10P accuracy combinations and project-based Ith/Idyn ratings. Read more »
Documents SZK-12 11kV Voltage Transformer Technical Specifications: Accuracy Performance & IEC 61869-3 Compliance May 12, 2026 / April 22, 2026 by tianming 4. Accuracy Performance The accuracy performance of the system is rigorously evaluated under diverse operational conditions to ensure consistent and reliable results. Across multiple test environments—including controlled laboratory settings, real-world field deployments, and simulated edge cases—the system demonstrates a mean absolute error (MAE) of less than 0.8% for primary measurement tasks. This level of precision […] Read more »
10KV Current Transformer 3kV-12kV Indoor CTs LZZBJ9-12A1, A2 11KV 12kV Indoor Cast-Resin Current Transformer May 12, 2026 / July 20, 2026 by tianming LZZBJ9-12A1 / LZZBJ9-12A2 12kV indoor full-enclosed epoxy cast-resin current transformer for 3kV–12kV medium-voltage switchgear. Designed for current measurement, energy metering and relay protection, with 1A/5A secondary output, 12/42/75kV insulation level, 0.2S/0.2/0.5/10P accuracy options and project-based Ith/Idyn ratings. Read more »
Documents High-Voltage Bushing Types, Selection & Maintenance: Oil-Immersed, Resin-Impregnated, Capacitive & Non-Capacitive Guide (IEC 60137, IEEE C57.19) May 12, 2026 by tianming High-Voltage Bushing Types, Selection & Maintenance: Oil-Immersed, Resin-Impregnated, Capacitive & Non-Capacitive Guide (IEC 60137, IEEE C57.19) Meta Description: Comprehensive guide on high-voltage bushing types, selection, and maintenance. Covers oil-immersed, resin-impregnated, capacitive, and non-capacitive bushings, compliance with IEC 60137 and IEEE C57.19, and includes testing procedures, failure analysis, and troubleshooting for MV/HV power transformers, switchgear, and […] Read more »
Documents Accurate 0.2S Metering & Protection: SZW-10R 11kV Outdoor/Indoor Current Transformer Selection Guide May 12, 2026 / April 22, 2026 by tianming Introduction The SZW-10R Current Transformer is a high-precision, resin-cast instrument transformer specifically engineered for accurate current measurement and protection in 10kV medium-voltage power distribution systems. Designed to meet the stringent requirements of modern electrical infrastructure, the SZW-10R ensures reliable operation under diverse environmental and electrical conditions. Its primary function is to proportionally reduce high primary […] Read more »
Documents AGE-1232 11kV Cast-Resin Voltage Transformer: IEC 61869-3 for Outdoor/Indoor Metering & Protection May 11, 2026 / April 22, 2026 by tianming Introduction The AGE-1232 Voltage Transformer is a precision-engineered instrument transformer designed for high-voltage measurement and protection applications in medium-voltage power systems operating up to 10kV. Developed to meet the stringent requirements of modern electrical infrastructure, this voltage transformer ensures accurate voltage transformation from primary to secondary circuits while maintaining galvanic isolation for safety and system […] Read more »
Documents SEL-751 21kV Cast-Resin Current Transformer for Substation Metering & Protection – IEC 61869-2 Compliant May 11, 2026 / May 2, 2026 by tianming For Substation Metering & Protection: JLS-20K 21kV Cast-Resin Voltage Transformer per IEC 61869-3 Introduction to the JLS-20K Voltage Transformer The JLS-20K is a single-phase, outdoor-rated cast-resin voltage transformer (VT) engineered for high-reliability operation in medium-voltage distribution networks operating at a nominal system voltage of 21 kV (IEC standard), corresponding to the domestic 20 kV system […] Read more »
Documents Instrument Transformer Earthing & Grounding Practices: Safety, EMC & Protection Reliability Guide (IEC 61869, IEEE C57.13) May 11, 2026 by tianming Instrument Transformer Earthing & Grounding Practices: Safety, EMC & Protection Reliability Guide (IEC 61869, IEEE C57.13) Meta Description: Comprehensive guide on instrument transformer earthing and grounding practices. Covers safety grounding, shielding, EMC compliance, protection reliability, and compliance with IEC 61869 and IEEE C57.13. Includes grounding schemes, testing procedures, and troubleshooting for common grounding-related failures. 1. […] Read more »
Documents AGE-1270 11kV Cast-Resin Current Transformer: IEC 61869-2 for Outdoor/Indoor Metering & Protection May 11, 2026 / April 22, 2026 by tianming Introduction The AGE-1270 Current Transformer (CT) is a high-precision, indoor-type instrument transformer specifically engineered for accurate current measurement and protection applications in medium-voltage power systems up to 10 kV. Designed in compliance with international standards including IEC 61869-2, IEEE C57.13, and GB/T 20840, the AGE-1270 ensures reliable performance under demanding electrical conditions while maintaining exceptional […] Read more »
Documents CT-35K 33kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified May 10, 2026 / May 2, 2026 by tianming CT-35K 33kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified Introduction to the CT-35K Current Transformer The CT-35K is a medium-voltage cast-resin current transformer engineered for reliable operation in 33kV (IEC) / 35kV (domestic) power systems. Designed in strict compliance with IEC 61869-2 and GB/T 20840.2, this instrument transformer serves dual […] Read more »
