Author: Vabo - Zhejiang Vabo Transformer Co.,Ltd

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How to Correctly Select Current Transformers and Voltage Transformers for Power Transmission and Distribution Projects

A Professional Selection Guide for Electrical Engineers, Switchgear Manufacturers, and Power Transmission & Distribution Equipment Buyers In modern power transmission and distribution systems, current transformers (CTs) and voltage transformers (VTs/PTs) are essential devices for electrical measurement, energy metering, and relay protection. For power engineering contractors,…

CT Accuracy Class 0.2S vs 0.5S: Which One Should You Choose?

Accuracy class is one of the most important parameters when selecting a current transformer (CT) for energy metering. Two common classes are 0.2S and 0.5S. Understanding their differences helps engineers and buyers select suitable equipment for power distribution projects. What Does CT Accuracy Class Mean?…

How to Choose an 11kV Current Transformer for Switchgear

Selecting the correct 11kV current transformer is essential for accurate metering, electrical monitoring, and relay protection. For switchgear manufacturers and electrical contractors, voltage rating alone is not enough to determine the right CT. Six Parameters to Check Before purchasing an 11kV current transformer, verify: For…

24kV Current Transformer: Selection Guide for Power Distribution

A 24kV current transformer (CT) provides secondary current signals for electrical measurement and metering in suitable medium-voltage systems. For electrical utilities, contractors, and equipment manufacturers, selecting the correct CT requires consideration of accuracy, insulation, current ratings, and environmental conditions. What Is a 24kV Current Transformer…

JLSZ□-35 35kV Outdoor Combined Metering Unit

The JLSZ□-35 is a three-phase outdoor combined metering unit integrating current and voltage transformers for accurate active and reactive energy metering in 35kV power systems. Technical Details Technical Parameters Parameter Value Model JLSZ□-35 Rated Primary Voltage 35 kV Rated Frequency 50 Hz Rated Voltage Ratio…

JLSZ□-20 20kV Outdoor Combined Metering Unit

The JLSZ□-20 is a three-phase outdoor combined metering unit integrating CT and VT functions for accurate active and reactive energy metering in 20kV power systems. Technical Details Technical Parameters Parameter Value Model JLSZ□-20 Rated Primary Voltage 20 kV Rated Frequency 50 Hz Rated Voltage Ratio…

JDZ(X)10-11 Indoor Voltage Transformer Series

The JDZ10-10 is a compact indoor epoxy-cast voltage transformer for electrical measurement, voltage monitoring, and relay protection in 10kV power systems. The JDZX10-10 is an indoor epoxy-cast voltage transformer with a residual voltage winding, designed for measurement and protection in 10kV systems. Technical Parameters Rated…

JDZW-11 11kV Outdoor Voltage Transformer

The JDZW-11 is a compact outdoor epoxy-cast voltage transformer for energy metering, voltage monitoring, and relay protection in 11kV power systems. Technical Parameters Rated Primary Voltage: 11 kV Rated Secondary Voltage: 0.11 kV Accuracy Class: 0.2 / 0.5 Rated Output: 30 / 50 VA Maximum…

JDZ(X)9-33 Indoor Voltage Transformer Series

The JDZ9-35 is a fully enclosed epoxy-cast indoor voltage transformer designed for electrical measurement, voltage monitoring, and relay protection in 35kV power systems. The JDZX9-35 is a 35kV indoor epoxy-cast voltage transformer with measurement and residual voltage windings for metering, monitoring, and relay protection. Specifications…

JDZ(X)W-33 Outdoor Voltage Transformer Series

The JDZW-35 is an outdoor epoxy-resin voltage transformer designed for energy metering, voltage monitoring, and relay protection in high-voltage power systems. The JDZXW-35 is an outdoor epoxy-cast voltage transformer with measurement and residual voltage windings for metering, monitoring, and protection applications. Specifications Primary Voltage: 35/√3…

VOL-24 24kV Outdoor Voltage Transformer

The VOL-24 is a 24kV oil-immersed outdoor voltage transformer designed for electrical measurement and relay protection in 50/60Hz power systems. Specifications Rated Primary Voltage: 22,000 V Rated Secondary Voltage: 110 V System Voltage: 24 kV Accuracy Class: 0.5 / 1 / 3 Rated Output: 50…

JDJJ2-33 33kV Outdoor Voltage Transformer

The JDJJ2-33 is a 33kV single-phase oil-immersed voltage transformer with an additional residual voltage winding for measurement and protection applications. Technical Parameters Rated Primary Voltage: 33/√3 kV Rated Secondary Voltage: 0.11/√3 kV Residual Winding Voltage: 0.11/3 kV Accuracy Class: 0.2 / 0.5 / 1 /…

LMZW-0.5(0.66) Outdoor Low-Voltage Current Transformer

The LMZW-0.5(0.66) is a fully enclosed outdoor current transformer for low-voltage power systems, designed for energy metering, current measurement, and relay protection. Technical Parameters Rated Primary Current: 100–1200 A Rated Secondary Current: 5 A / 1 A Rated Voltage: 0.66 kV Accuracy: 0.2S / 0.5S…

LMZBJ9-10S 10kV Indoor Current Transformer

The LMZBJ9-10S is a fully enclosed epoxy-cast current transformer for 10kV indoor power systems, designed for current measurement, energy metering, and relay protection. Technical Parameters Rated Primary Current: 600/5–2500/5 A Rated Secondary Current: 5 A / 1 A Rated Voltage: ≤10 kV Accuracy Combinations: 0.2S/10P…

LYM-0.5 Low-Voltage High-Current Transformer

The LYM-0.5 is an indoor low-voltage high-current transformer designed for busbar applications, providing accurate measurement, energy metering, and relay protection. Technical Parameters Rated Voltage: ≤0.66 kV Rated Secondary Current: 5 A / 1 A Accuracy: 0.2 / 0.5 / 0.2S / 0.5S Application: Measurement /…