Zero Sequence CT LJZ-φ65, φ75, φ110, φ150 cast-resin Zero Sequence Current Transformer May 6, 2026 / June 18, 2026 by tianming LJZ-φ65 / φ75 / φ110 / φ150 indoor cast-resin zero sequence current transformers for cable earth fault detection and grounding protection in 50Hz/60Hz systems up to 35kV. The series uses annular cores with different window diameters for different cable sizes and supports DD-11/60 relay matching, series or parallel coil connection, and protection schemes with or without compensation capacitor. Read more »
Zero Sequence CT LJ-φ75 Zero Sequence Current Transformer for Cable Earth Fault Protection May 6, 2026 / June 18, 2026 by tianming LJ-φ75 indoor zero sequence current transformer for cable earth fault detection and grounding protection in 50Hz/60Hz systems up to 35kV. Designed with a φ75 mm annular cable window, 30/1A rated current ratio, 6–10A protection sensitivity, DD-11/60 relay matching reference, and secondary winding 3kV power-frequency withstand voltage to ground. Read more »
Documents Voltage Transformer (PT) Primary Fuse Selection, Protection & Resonance Mitigation Guide (IEC 61869-3) May 6, 2026 by tianming Voltage Transformer (PT) Primary Fuse Selection, Protection & Resonance Mitigation Guide (IEC 61869-3) Meta Description: Comprehensive guide on voltage transformer (PT) primary fuse selection, secondary protection, and ferroresonance mitigation. Covers HRC fuse characteristics, current-limiting principles, coordination with PT thermal limits, and compliance with IEC 61869-3 and IEEE C57.13. Includes calculation examples, protection schemes, and troubleshooting […] Read more »
Documents MER-1 11kV Cast-Resin Current Transformer for Substation Metering & Protection – IEC 61869-2 Compliant May 6, 2026 / May 2, 2026 by tianming For Substation Metering & Protection: MER-1 11kV Cast-Resin Voltage Transformer per IEC 61869-3 Introduction to the MER-1 Voltage Transformer The MER-1 is a single-phase, indoor/outdoor-rated cast-resin voltage transformer (VT) engineered for precision voltage transformation in 11kV (IEC) / 10kV (domestic) medium-voltage distribution systems. Designed in strict accordance with IEC 61869-3 and GB/T 20840.3, it converts […] Read more »
Documents LZZBJ9-10 11kV Current Transformer: IEC 61869-Compliant CT for Metering & Protection (0.2S Accuracy) May 6, 2026 / April 22, 2026 by tianming Introduction The LZZBJ9-10 current transformer (CT) is a high-precision, resin-cast indoor-type instrument transformer designed for 10kV power systems. With its robust construction, excellent insulation properties, and accurate current transformation ratio, it plays a critical role in metering, protection, and monitoring applications across diverse electrical infrastructures. This guide outlines practical application scenarios where the LZZBJ9-10 CT […] Read more »
Zero Sequence CT LXK-120 Split-Core Zero-Sequence Current Transformer for Ground Fault (≤10kV) May 6, 2026 / June 18, 2026 by tianming Product Overview Functional Definition The LXK-120 split-core zero-sequence current transformer (core-balance CT) is a protective current transformer designed for earth-fault (zero-sequence) detection in low and medium-voltage AC power systems up to 10 kV. Based on electromagnetic induction, it detects residual (zero-sequence) current as the vector sum of phase currents passing through the aperture, providing a […] Read more »
High-Voltage Metering Box JLSW3-33 Outdoor Horizontal Oil-Immersed High-Voltage Metering Tank May 5, 2026 / July 19, 2026 by tianming JLSW3-33 outdoor horizontal oil-immersed high-voltage metering tank for 33kV and 35kV-class power systems. Designed for outdoor line electric energy metering, integrating current transformer and voltage transformer units in one oil-filled tank, with 0.2S/0.5S accuracy options, 50Hz/60Hz operation, weather-resistant structure, and pole-mounted or platform-mounted installation. Read more »
Documents IEC-Certified LZZBJ9-12 Current Transformer—11kV Indoor CT with Dual Metering & Protection Accuracy May 5, 2026 / May 2, 2026 by tianming Introduction The LZZBJ9-12 current transformer is a high-precision, indoor-type instrument transformer designed for use in 10kV (nominal voltage) alternating current (AC) power systems. It serves critical roles in electrical energy metering, protective relaying, and system monitoring by accurately transforming high primary currents into standardized, lower secondary currents suitable for connected instrumentation and protection devices. This […] Read more »
Documents LZZBJ9-10 11kV Current Transformer: IEC 61869 Indoor CT with 0.2S Accuracy for Metering & Protection May 5, 2026 / April 22, 2026 by tianming Introduction The LZZBJ9-10 current transformer is a high-accuracy, indoor-type instrument transformer designed for use in 10kV AC power systems operating at 50Hz or 60Hz. It serves critical roles in metering, protection, and monitoring applications by accurately stepping down primary currents to standardized secondary values (typically 1A or 5A) suitable for interfacing with relays, meters, and […] Read more »
Low Voltage PTs Low Voltage Potential Transformers JSGW-0.5 Three-Phase Five-Leg Low Voltage Potential Transformer May 5, 2026 / June 18, 2026 by tianming JSGW-0.5 dry-type low-voltage potential transformer for indoor three-phase systems. Designed for voltage measurement, electric energy metering, relay protection and residual voltage monitoring, with three-phase five-leg core, 100/√3 main secondary output, 100/3 auxiliary open-delta output, 50Hz operation and rated outputs up to 340VA. Read more »
Low Voltage PTs Low Voltage Potential Transformers JDZ6-1 indoor epoxy resin insulated Potential Transformer May 5, 2026 / June 18, 2026 by tianming JDZ6-1 indoor dry-type potential transformer with epoxy resin insulation for AC power systems. Designed for voltage measurement, electric energy metering and relay protection, with 220/100V, 380/100V and 500/100V ratios, 100V secondary output, 15/25/50VA rated output options and C-core fixed installation. Read more »
Low Voltage PTs Low Voltage Potential Transformers JDZ1-1, JDZ2-1 indoor cast-resin insulated potential transformer May 5, 2026 / June 18, 2026 by tianming JDZ1-1 / JDZ2-1 indoor low-voltage potential transformers for AC power systems up to 1kV. Designed for electric energy metering, voltage measurement, voltage control and relay protection, with 100V secondary output, 25VA rated output, cast-resin insulation, 50/60Hz operation and voltage ratios including 380,660/100V, 660,1140/100V and 750,1500/100V. Read more »
