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 »
Documents MER-1 11kV Cast-Resin Voltage Transformer: IEC 61869-3 for Outdoor/Indoor Metering & Protection May 10, 2026 / April 22, 2026 by tianming Introduction The MER-1 Voltage Transformer is a precision instrument designed for accurate voltage measurement and protection in medium-voltage electrical power systems operating at nominal voltages up to 10 kV. Engineered to meet international standards including IEC 61869-3 and GB/T 20840.3, the MER-1 ensures reliable performance under diverse operational conditions encountered in industrial, commercial, and utility-scale […] Read more »
Documents Cast-Resin LZZBJ9-12 CT Maintenance: Sustain Metering Precision in 10kV Indoor Switchgear Installations May 10, 2026 / May 2, 2026 by tianming Introduction The LZZBJ9-12 current transformer is a resin-insulated, indoor-type instrument transformer designed for accurate current measurement and protection in 10 kV AC power systems operating at 50 Hz or 60 Hz. This device plays a critical role in ensuring the safe and reliable operation of medium-voltage switchgear by providing scaled-down replicas of primary currents to […] Read more »
Documents XGW-12 11kV Cast-Resin Voltage Transformer: IEC 61869-3 for Outdoor/Indoor Metering & Protection May 10, 2026 / April 22, 2026 by tianming Introduction The XGW-12 Voltage Transformer is a precision-engineered instrument transformer designed for accurate voltage measurement, protection, and metering applications in 10 kV medium-voltage power systems. Engineered to meet stringent international standards—including IEC 61869-3, GB/T 20840.3, and DL/T 726—the XGW-12 ensures reliable performance under diverse operating conditions encountered in utility substations, industrial facilities, and renewable energy […] Read more »
Documents PT for Synchronism Check & Auto-Reclosing: Voltage Transformer Accuracy, Phase Shift & Relay Coordination Guide (IEC 61869-3, IEEE C57.13) May 10, 2026 by tianming PT for Synchronism Check & Auto-Reclosing: Voltage Transformer Accuracy, Phase Shift & Relay Coordination Guide (IEC 61869-3, IEEE C57.13) Meta Description: Comprehensive guide on voltage transformer (PT) requirements for synchronism check and auto-reclosing applications. Covers accuracy class, phase angle error, transient response, relay coordination, and compliance with IEC 61869-3 and IEEE C57.13. Includes selection methodology, […] Read more »
Documents SZW-6 11kV Cast-Resin Voltage Transformer: IEC 61869-3 for Outdoor/Indoor Metering & Protection May 9, 2026 / April 22, 2026 by tianming Introduction The SZW-6 voltage transformer is a precision instrument designed for accurate voltage measurement and protection in 10 kV medium-voltage power systems. As a core component in electrical substations, switchgear, and distribution networks, the SZW-6 ensures reliable transformation of high primary voltages to standardized secondary levels suitable for metering, monitoring, and protective relaying applications. Engineered […] Read more »
Documents SEL-751 11kV Cast-Resin Current Transformer for Metering & Protection Compliant with IEC 61869-2 for substation appli… May 9, 2026 / May 2, 2026 by tianming High-Performance 11kV Cast-Resin Current Transformer AGE-1270 for Metering & Protection per IEC 61869-2 Introduction to the AGE-1270 Current Transformer The AGE-1270 is a high-reliability, cast-resin insulated current transformer (CT) engineered for accurate current measurement and robust protective relay coordination in medium-voltage power systems operating at 11kV (IEC standard) or 10kV (domestic equivalent). Designed in strict […] Read more »
Documents Zero-Sequence vs. Residual Earth Fault Protection: CT Configuration, Sensitivity & Application Guide (IEC 61869, IEEE C57.13) May 9, 2026 by tianming Zero-Sequence vs. Residual Earth Fault Protection: CT Configuration, Sensitivity & Application Guide (IEC 61869, IEEE C57.13) Meta Description: Comprehensive comparison of zero-sequence and residual earth fault protection schemes. Covers CT configurations, sensitivity analysis, application guidelines, and compliance with IEC 61869 and IEEE C57.13. Includes selection methodology, wiring practices, and troubleshooting for MV/HV power systems. 1. […] Read more »
Documents LA-10Q 11kV Current Transformer: IEC 61869-Compliant CT for Outdoor/Indoor Metering & 0.2S Accuracy May 9, 2026 / April 22, 2026 by tianming Introduction The LA-10Q Current Transformer (CT) rated for 10kV systems is a critical component in modern electrical infrastructure, designed to accurately measure and protect medium-voltage circuits. Engineered for reliability, precision, and durability, the LA-10Q conforms to international standards such as IEC 61869 and ANSI C57.13, ensuring compatibility across diverse applications. Its robust epoxy resin encapsulation […] Read more »
