Product Overview

Zero -Sequence Current transformer Match with signal equipment and protective relaying equipment when power system produce zero sequence earthing current,act the equipment components to realize protective or monitoring function.It adopts stainless steel metal shell and easy installation save much room,many specs' high accuracy zero sequence CT are power system（such as neutral earthing， big current earthing,small current earthing or arc suppression coil earthing）etc

Key Features

• High-Precision Current Measurement：Adopting high-permeability silicon steel core, achieving accuracy class 0.2S with error ≤0.2% within 1%~120% of rated current, meeting high-precision requirements for energy metering devices. Secondary rated current supports 5A/1A options to adapt to different measuring equipment interfaces.

• Wide-Range Adaptive Design：Current ratio ranges from 50/5 to 2000/5A, enabling flexible range switching via multi-tap design (e.g., dual ranges of 200/5A and 400/5A). With a dynamic response range of 1:100, it simultaneously satisfies normal load monitoring and large-current measurement during short-circuit faults.

• Fully Enclosed Insulation Structure：Formed by vacuum-cast epoxy resin with IP65 protection rating, effectively resisting moisture, salt fog, and dust. Insulation materials comply with UL94 V-0 flame retardant grade, withstanding -40℃~+85℃ temperature range, suitable for harsh environments like outdoor substations and humid basements.

• Anti-Saturation & Transient Response Characteristics：The core uses a special magnetic circuit design to avoid saturation under short-circuit current (20 times rated current), ensuring transient current waveform fidelity. 5P20-class protection windings meet rapid action requirements of relay protection devices, with action time ≤10ms.

Technical Data

• Rated secondary current: 5A,1A

• Power frequency withstand voltage:  3kV

• Rated frequency: 50/60Hz

• Installation site: Indoor

• Technical standard: IEC 60044-1 (IEC 61869-1&2)