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Current value transformer
Current value transformers, also known as current transformers (CTs) or instrument transformers, are essential components in electrical power systems for measuring alternating current (AC). These devices step down high primary currents to a standardized, safe secondary value, typically 1A or 5A, enabling accurate metering, protection, and monito...
Current value transformers, also known as current transformers (CTs) or instrument transformers, are essential components in electrical power systems for measuring alternating current (AC). These devices step down high primary currents to a standardized, safe secondary value, typically 1A or 5A, enabling accurate metering, protection, and monitoring. Key technical parameters include rated primary current (e.g., 100A, 600A, 2000A), rated secondary current, accuracy class (e.g., 0.2, 0.5, 1, 5P10, 10P20), rated burden (VA), and insulation level. They are available in various construction types: wound primary, bar-type, and split-core (for retrofitting without disconnecting conductors). The selection depends on the application—measuring CTs for revenue metering require high accuracy (class 0.2S or 0.5S), while protection CTs prioritize saturation characteristics (class 5P or 10P) for relay coordination. Voltage ratings typically range from 0.6 kV to 36 kV for low and medium voltage systems, with higher ratings for high voltage substations.
Current transformers are deployed across a wide spectrum of electrical installations, from low voltage distribution boards to high voltage substations and industrial process plants. In switchgear and panel boards, they feed current signals to analog meters, digital multifunction instruments, and protective relays (e.g., overcurrent, earth fault, differential). They are critical in power quality analyzers for harmonic measurement and in energy management systems for submetering. Key sectors include utilities (substation metering and protection), manufacturing (motor control centers, welding equipment), renewable energy (solar inverters, wind turbine converters), data centers (UPS systems), and commercial buildings (main distribution panels). For outdoor installations, resin-cast or oil-impregnated CTs with IP54 or higher protection are specified, while indoor applications often use molded case or split-core designs.
Our portfolio includes several subcategories and article codes for current value transformers. Key subcategories include: wound primary CTs (e.g., code series CTW-xxx, where xxx denotes primary current in amperes), bar-type CTs (e.g., CTB-xxx, with primary current and window size), split-core CTs (e.g., CTS-xxx, for easy installation), and summation CTs (e.g., CTSM-xxx, for summing multiple currents). Article codes typically follow a pattern: prefix for type (CTW, CTB, CTS), followed by primary current rating (e.g., 100, 600, 2000), then accuracy class (e.g., 0.5, 5P10), and optionally burden (e.g., 10VA). For example, CTW-600-0.5-10VA indicates a wound primary CT with 600A primary, class 0.5 accuracy, and 10VA burden. We also stock low power current transformers (LPCTs) for electronic metering and Rogowski coils for flexible measurement.
Partnering with Electric Automation Network ensures access to genuine, certified current transformers from leading global manufacturers, with real-time pricing and stock visibility. Our engineering team provides personalized technical support for CT selection, including burden calculation, accuracy class verification, and system integration. We offer express worldwide shipping, with documentation such as test certificates, wiring diagrams, and datasheets available per article. Whether you need a standard 100A/5A CT for a panel upgrade or a high-accuracy 2000A/1A CT for a substation, we deliver the right solution with technical rigor and commercial efficiency.
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