Nanocrystalline Cores For Zero Sequence Current Transformer

Introduction:

The basic principle of zero-sequence current protection is based on Kirchhoff’s current law: the algebraic sum of the complex currents flowing into any node of the circuit is equal to zero. When the circuit and the electrical equipment are normal, the vector sum of the current in each phase is equal to zero, so the secondary winding of the zero-sequence current transformer has no signal output, and the actuator does not act.

When a ground fault occurs, the vector sum of each phase current is not zero. The fault current generates flux in the ring core of the zero-sequence current transformer. The induced voltage on the secondary side of the zero-sequence current transformer makes the actuator act, drives the trip device, switches the power supply network, and achieves the purpose of grounding fault protection.

iron-based Nanocrystalline cores:

In the zero sequence current transformer, the nanocrystalline cores is mainly used to improve the precision and stability of the transformer. Because the nanocrystalline core has high permeability, it is able to detect and measure the changes in current more accurately. In addition, the ultracrystalline structure of the nanocrystalline core also helps to improve the stability and reliability of the current transformer.

Features:

1. High permeability – increase the accuracy of CT.
2. Wide measurement current range.
3. High magnetization – decrease the security factor of CT.
4. Excellent temperature stability – from -30 ℃ to 120 ℃.
5. Lower manufacturing costs – compared with Permalloy.

Applications:

• Electric Protection
• Relay Protection Device
• Monitoring and Control System

Nanocrystalline Cores Zero sequence current transformer is a very important equipment in power system, it can monitor and measure the zero sequence current in power system in real time, and trigger protection measures when necessary to ensure the stable operation of the system. It is widely used in electrical protection, relay protection devices and monitoring and control systems. By using zero sequence current transformer, the safety, reliability and stability of power system can be effectively improved.

Specifications:

Bare Core’s Shape: Toroidal Cores, Rectangular Cores.

Note: 1) The CT cores can be customized according to the specific size and performance requirements of users.
2) Plastic case or Epoxy coating is available.