As the professional manufacturer, Wzonpa would like to provide you customized Current Transformer (CT), which is a specialized instrument transformer widely used in the indoor switchgears or outdoor power transmission and distribution systems. The main function of the current transformer is to transfer down high alternating currents to lower, standardized current values that can be safely and accurately measured by instruments or used by the protective relays.The current transformer provides electrical isolation between high-voltage primary circuits and secondary measurement circuits, The CTs' main working scope is for monitoring, control, and protection across generation, power transmission, and distribution system.
The high quality current transformer is a type of transformer used specifically for measuring alternating current in the power system. It typically consists of a primary winding which usually just a wire or busbar passing through the iron core and a multi-turn secondary winding which wound around a silicon steel core). The difference of current transformers with voltage transformers is that CTs are constructed to present a negligible load to the primary circuit, which can ensure the primary current remains practically unaffected. The current transformers are defined by their current ratio, such as 4000:5, meaning 4000 amperes in the primary produces 5 amperes in the secondary, which is commonly standardized at 1A or 5A for compatibility with meters and relays.
The working principle of a current transformer in stock is from electromagnetic induction, when the alternating current flowing through the primary conductor,the current will produce a varying magnetic field in the core. Then this magnetic field will induce a proportional current in the secondary winding. The ratio between the primary and secondary currents is determined by the number of turns in the secondary winding. For ensure accurate performance of the data, we must remain the core is within its linear magnetic region to avoid saturation, which can distort the output. Close coupling between the windings can ensure the secondary current faithfully represents the primary current over a defined range, even when the power equipments is under fault conditions.
The Current transformer (CT) made in China is a very important electrical compontent for the safe and efficient operation of power systems such as indoor switchgear.
The current transformets are widely used for metering and billing in commercial and industrial power supplies, especially revenue-grade CTs provide accurate current signals to watt-hour meters.
For the schemes of protection function, CTs supply current signals to protective relays to detect faults such as overloads or ground faults, this can isolate circuit rapidly.
And also, CTs are used in residual current devices like Ground Fault Circuit Interrupters (GFCIs) in residential and commercial installations to prevent electric shock by detecting imbalance between line and neutral currents.
The current transformers also extends to temporary measurements using split-core designs that can be installed without disconnecting the primary conductor.
