Low Voltage CTs Low Voltage Current Transformers LMZ Series 0.66kV Indoor Epoxy resin cast Current Transformer May 3, 2026 / May 13, 2026 by tianming LMZ5/6/7/8 series 0.66kV indoor current transformers for low-voltage metering applications. Four structural configurations (rectangular, window-type, ring-type) with unsaturated cast-resin or plastic shell insulation, 0.2/0.2S/0.5/0.5S accuracy classes, 1A/5A secondary output, 5-4000A primary current range. IEC 61869 and GB/T 20840 compliant. Custom specifications available. Read more »
Low Voltage CTs Low Voltage Current Transformers LQZJ-0.66 low-voltage indoor Current Transformer Epoxy resin cast May 3, 2026 / May 13, 2026 by tianming LQZJ-0.66 indoor cast-resin current transformer for 0.66 kV (660 V) low-voltage AC distribution at 50/60 Hz. Primary current 5–1000 A, 5 A secondary, accuracy class 0.2 / 0.5 / 1 / 10P, rated burden 10–15 VA, Ith 50 I₁n, Idyn 100 I₁n. Vacuum-cast epoxy insulation, Ø103 mm aperture, 140×127.5 mm envelope, bottom or side mount. Compliant with IEC 61869-1/2 and GB/T 20840.1/2; direct replacement for LQG-0.5. Engineering datasheet, accuracy limits, burden calculation and selection guide. Read more »
Low Voltage CTs Low Voltage Current Transformers AKH-0.66/23/58/88/812/816 Split-Core Current Transformer May 3, 2026 / May 13, 2026 by tianming AKH-0.66 split-core current transformers for 0.66kV low-voltage distribution metering and protection. Opening-type design enables retrofit installation with 5A secondary output, accuracy classes 0.5/1/3, cast resin insulation. Compliant with GB1208-2006 and IEC60044-1:2003. Available in five window aperture variants. Read more »
Low Voltage CTs Low Voltage Current Transformers AG12-0.72 Indoor Low Voltage Current Transformer May 3, 2026 / May 13, 2026 by tianming AG12-0.72 indoor plastic case current transformers for 0.72kV (720V) low-voltage distribution. Features 5A secondary output, class 0.5/1.0 accuracy, window-type aperture mounting. Multiple models available (50/5A-4000/5A ratios). IEC60044-1:2003 and GB1208-2006 compliant. Custom configurations available. Read more »
Documents LZZBJ9-10 11kV Cast-Resin Current Transformer: IEC-Compliant Testing & Maintenance for Metering & Protection May 3, 2026 / April 22, 2026 by tianming 4. Periodic Testing Periodic testing is a scheduled, systematic evaluation of electrical systems and components to ensure ongoing compliance with safety standards, operational reliability, and regulatory requirements. Conducted at predetermined intervals—such as annually, semi-annually, or quarterly—these tests help identify degradation, wear, or latent faults before they lead to failures or hazards. The frequency of testing […] Read more »
Documents Accurate 0.2S Class 11kV CT LZZBJ9-12 – Cast-Resin, Dual Indoor/Outdoor Use for RMUs & Substations May 3, 2026 / April 22, 2026 by tianming Introduction The LZZBJ9-12 current transformer is a high-performance, resin-insulated instrument transformer specifically engineered for accurate current measurement and protection in 10 kV (nominal system voltage) alternating current (AC) power systems. Designed in accordance with international standards such as IEC 61869-2 and national specifications like GB/T 20840.2, this transformer ensures reliable operation under demanding electrical and […] Read more »
Documents Zero-Sequence Current Transformer (ZSCT) & Core-Balance CT: Working Principle, Selection & Ground Fault Protection Guide (IEC 61869-2) May 3, 2026 by tianming Zero-Sequence Current Transformer (ZSCT) & Core-Balance CT: Working Principle, Selection & Ground Fault Protection Guide (IEC 61869-2) Meta Description: Comprehensive guide on Zero-Sequence Current Transformers (ZSCT) and Core-Balance CTs. Covers working principle, toroidal design, sensitivity, earth fault protection, cable passing configurations, selection methodology, and compliance with IEC 61869-2. Includes installation guidelines, testing procedures, and harmonic […] Read more »
Low Voltage CTs Low Voltage Current Transformers AG5-0.66 Indoor Plastic Case Current Transformer May 3, 2026 / May 13, 2026 by tianming Product Overview Functional Definition The AG5-0.66 series current transformers are precision electromagnetic instruments designed for accurate current measurement and energy metering applications in low-voltage AC power systems (660V class). These transformers utilize electromagnetic induction principles to provide galvanically isolated secondary current signals proportional to primary current. Key Ratings Snapshot Item Specification (per order / nameplate) […] Read more »
Low Voltage CTs Low Voltage Current Transformers LYM-0.5 Low-Voltage Indoor Current Transformer May 3, 2026 / May 13, 2026 by tianming LYM-0.5 dry-type indoor CT for 0.5kV systems. Busbar mounting, 750A-25000A primary, 5A secondary, Class 3 accuracy, 20-50VA output. Silicon steel core per Q/JB 3375-84, IEC 61869 customizable. Read more »
Low Voltage CTs Low Voltage Current Transformers SDH-BH-0.66(IV/V) Low-Voltage Indoor CT May 3, 2026 / May 13, 2026 by tianming SDH-BH-0.66 series window-type current transformers for 0.66kV (660V) low-voltage distribution metering. Multiple window sizes (60×30 to 130×50mm), 1A/5A secondary, 0.2/0.2s/0.5/0.5s accuracy classes. Compliant with GB1208-2006 and IEC60044-1:2003. Read more »
Low Voltage CTs Low Voltage Current Transformers RCT 0.66kV low-voltage Current Transformer | Indoor May 3, 2026 / May 13, 2026 by tianming RCT indoor current transformer for 0.66kV low-voltage distribution with 5A secondary output, accuracy class 0.5/1.0, loop-type iron core, plastic insulation, rated burdens 5-25VA, GB/T 20840.8 compliance, and customizable configurations for energy metering and relay protection applications. Read more »
Low Voltage CTs Low Voltage Current Transformers PR Dry-Type Current Transformer | Indoor May 3, 2026 / May 13, 2026 by tianming PR series dry-type bushing current transformers for 0.66kV low-voltage AC power systems. Available in 5P and 10P protection classifications with 1A/5A secondary output. Cast-resin or insulation-tape construction for air, SF6, or oil-immersed installations. IEC 61869 and IEEE C57.13 compliant. Custom configurations available including multi-ratio designs. Read more »
