High-Voltage Metering Box JLSW3-33 Outdoor Horizontal Oil-Immersed High-Voltage Metering Tank May 5, 2026 / May 5, 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 / May 12, 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 / May 12, 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 / May 12, 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 »
Low Voltage PTs Low Voltage Potential Transformers JDG4-0.5 indoor dry-type low-voltage Potential transformer May 5, 2026 / May 12, 2026 by tianming JDG4-0.5 indoor dry-type voltage transformer for low-voltage AC systems up to 0.5kV. Designed for voltage measurement, electrical energy metering and relay protection, with 100–1140V/100V ratio options, 0.5 accuracy class, 15VA rated output, 100VA limit output, C-core dry-type structure and fixed indoor installation. Read more »
Low Voltage PTs Low Voltage Potential Transformers JDG-0.5, JDG4-0.5 indoor dry-type low-voltage Potential transformer May 5, 2026 / May 12, 2026 by tianming JDG-0.5 / JDG4-0.5 indoor dry-type voltage transformers for low-voltage AC systems up to 0.5kV. Designed for voltage measurement, electrical energy metering and relay protection, with 220/100V, 380/100V and 500/100V ratios, 0.5/1/3 accuracy classes, 100V secondary output and dry-type fixed installation. Read more »
Documents Ensure Accurate Metering & Protection with LZZBJ9-10 Cast-Resin CT Maintenance per IEC & GB/T Standards May 5, 2026 / April 22, 2026 by tianming Introduction The LZZBJ9-10 current transformer is a resin-insulated, indoor-type instrument transformer designed for accurate current measurement and protection in 10kV power systems. It conforms to international standards such as IEC 61869 and GB/T 20840, ensuring high reliability, thermal stability, and long service life under normal operating conditions. This device plays a critical role in monitoring […] Read more »
Documents Electronic & Optical Current Transformers: Rogowski Coil, LPCT, Faraday Effect & IEC 61850-9-2 Digital Output Guide May 5, 2026 by tianming Electronic & Optical Current Transformers: Rogowski Coil, LPCT, Faraday Effect & IEC 61850-9-2 Digital Output Guide Meta Description: Comprehensive guide on electronic and optical current transformers (ECT/OCT). Covers Rogowski coil, low-power coil (LPCT), Faraday effect optical CT, electronic voltage transformers (EVT), merging units, IEC 61850-9-2 digital output, and smart substation integration. Includes selection methodology, testing […] Read more »
Documents SEL-351 11kV Cast-Resin Current Transformer for Substation Metering and Protection – IEC 61869-2 Certified May 5, 2026 / May 2, 2026 by tianming 11kV Cast-Resin Current Transformer UNKNOWN for Meterin […] Read more »
Documents LZZBJ9-10 11kV Current Transformer: IEC-Compliant Testing & Maintenance Guide for Indoor Metering & Protection May 4, 2026 / April 22, 2026 by tianming 4. Periodic Testing Periodic testing is a scheduled, systematic evaluation of electrical systems and components to ensure ongoing safety, reliability, and compliance with regulatory standards. Conducted at predetermined intervals—such as annually, semi-annually, or quarterly—these tests help identify degradation, wear, or latent faults before they lead to failure or hazards. Key elements include insulation resistance testing, […] Read more »
