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In power systems, primary circuits operate at high voltages and carry large currents, with rated parameters varying widely. Instruments and protective devices used for measuring and controlling the primary system cannot be directly connected due to these high voltages and currents. To safely and accurately obtain current and voltage information from the primary electrical circuit, current and voltage transformers are employed to isolate these large currents and high voltages
Shenzhen Kunyo can customize current sense transformer (CT) for your projects with reasonably priced .We can support small-batch customization. Inquiries are welcome.
A current transformer (CT) is an electrical device designed to measure high currents by employing the principle of electromagnetic induction. It proportionally converts high primary currents into lower secondary currents suitable for measurement instruments or protective devices. The primary function of a CT is to transform large currents into standardized smaller currents (commonly 5A or 10A) to facilitate the standardization of measuring instruments, protective equipment, and automatic control devices.
A current transformer (CT) is an electrical device that uses the principle of electromagnetic induction to proportionally convert high primary currents into lower secondary currents, facilitating measurement and protection in electrical systems
Its primary function is to transform large currents into standardized smaller currents (commonly 5A or 1A), enabling the standardization and miniaturization of measuring instruments, protection devices, and automatic control equipment. This transformation allows for the use of instruments with lighter structures and lower costs, suitable for panel installations, and permits the use of cables with smaller cross-sections for long-distance measurements. For example, a current transformer with a ratio of 400/5 converts an actual current of 400A into 5A. .
Current Sense transformers provide electrical isolation between secondary equipment and high-voltage primary circuits, ensuring the safety of personnel. The secondary side of the transformer is typically grounded, preventing high-voltage hazards on secondary equipment in case of insulation failures between the primary and secondary sides
With the rapid development of smart grids, integrating current transformers with digital communication technologies enables remote transmission and monitoring of current data. Data collected by current Sense transformers can be uploaded to monitoring centers or cloud platforms, allowing power dispatchers to monitor the operating status of the power system in real-time, perform load forecasting, fault prediction, and optimize dispatching.
Current Sense transformers contribute to the economic efficiency and reliability of power system operations. Accurate current measurements help reduce line losses and improve power transmission efficiency. In protection systems, their application allows for timely detection and isolation of fault points, reducing the scope and duration of outages and enhancing power supply reliability.
Primary Current: The primary winding, with relatively few turns, is connected in series within the circuit carrying the current to be measured. The current flowing through this winding is determined solely by the load current of the measured circuit and is independent of the secondary winding’s current. .
The secondary winding contains more turns, often several times that of the primary winding. The current in the secondary winding is directly proportional to the primary current, scaled by the turns ratio between the two windings.
The secondary circuit of the current transformer is connected to the current coils of measuring instruments and relays, which typically have low impedance. As a result, under normal operating conditions, the secondary side operates close to a short-circuit state. This characteristic distinguishes current transformers from standard power transformers.
The principle of a current sense transformer (CT) is based on electromagnetic induction. A CT consists of a closed iron core and windings. Its primary winding has very few turns and is connected in series with the circuit whose current needs to be measured, often carrying the entire current of that circuit. The secondary winding has a significantly higher number of turns and is connected to measuring instruments and protective devices. During operation, the secondary circuit of the CT remains closed, and due to the low impedance of the measuring instruments and protective devices, the CT operates in a state close to a short circuit.
Established in 2013, Shenzhen Kunyo Technology is committed to designing and manufacturing custom magnetic components, including high-frequency transformers, low-frequency transformers, audio transformers, power transformers, and inductors.
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