Zero Sequence CT LXKW-120/75/57 Indoor Cast-Resin Open Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXKW-120/75 and LXKW-120/57 indoor cast-resin open zero sequence current transformers for cable earth fault protection and residual current monitoring. Designed with a φ120 mm inner window, 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output, 10P5/10P10 protection classes, and 57 mm or 75 mm body thickness options for different cabinet layouts. Read more »
Documents LZZBJ9-10 11kV Current Transformer Selection: 0.2S Accuracy Cast-Resin CT for IEC Metering & Protection May 6, 2026 / April 22, 2026 by tianming Introduction The LZZBJ9-10 current transformer is a widely used indoor-type, resin-cast, through-core instrument transformer designed for 10kV 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 instruments and relays. Constructed with high-quality epoxy resin and […] Read more »
Zero Sequence CT LMZC-0.5 φ80, φ100, φ120 Split-Core Current Transformer epoxy cast-resin May 6, 2026 / May 6, 2026 by tianming LMZC-0.5 split-core current transformer for 6kV to 35kV indoor ring network cabinets and cable head outlet protection. The epoxy cast-resin open-type CT can be installed around existing cables without disconnection, with LMZC-80/100/120 sizes, Φ60-Φ120 aperture options, 10P10 protection class, 50A-400A primary current ratings and 1.5VA/3.75VA/5VA rated outputs. Read more »
Zero Sequence CT LJZ-φ65, φ80, φ100, φ120, φ165 Epoxy Resin Cast Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LJZ-φ65, φ80, φ100, φ120, φ165 indoor epoxy resin cast zero sequence current transformers for cable earth fault detection, residual current monitoring and grounding protection. The series provides φ65, φ80, φ100, φ120 and φ165 cable window options, 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output, and 10P protection classes for relay protection systems. Read more »
Zero Sequence CT LXZK-0.5(0.66) cast-resin Open-Type Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXZK-0.5(0.66) cast-resin open-type zero sequence current transformer for indoor cable, copper busbar and KHCT switchgear earth fault protection. The split-core cast-resin CT supports retrofit installation without disconnecting conductors, with 60×35 to 160×50 mm window sizes, 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output and 10P protection classes. Read more »
Zero Sequence CT LXZ1(2)-80/100/120/140/160/180 Indoor Cast-Resin Zero Sequence Current Transformer May 6, 2026 / May 6, 2026 by tianming LXZ1(2)-80/100/120/140/160/180 indoor cast-resin zero sequence current transformers for cable earth fault detection, residual current monitoring and grounding protection. The series offers 80–180 mm aperture options, 0.72/3kV insulation level, 50Hz/60Hz operation, 5A or 1A secondary output, and 10P5/10P10/10P15/10P20 protection classes for indoor protection cabinets and cable feeder systems. Read more »
Zero Sequence CT LJZ-φ65, φ75, φ110, φ150 cast-resin Zero Sequence Current Transformer May 6, 2026 / May 6, 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 / May 6, 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 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 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 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 / May 6, 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 »
