The HY-ZCT-21136 type zero-sequence current transformer is used in conjunction with the relay protection device or signal when the power system generates zero-sequence grounding current to make the device components act and realize protection or monitoring.
When an electric shock or leakage fault occurs in the circuit, the secondary side of the transformer outputs the zero-sequence current, so that the equipment on the connected secondary line can be protected (cut off the power supply, alarm, etc.).
- Detection of unbalanced current: ZCT is designed to measure the unbalanced current in a three-phase electrical system, which is the sum of the three phase currents. This allows them to detect ground faults, which can occur when a fault current flows from one or more of the phase conductors to ground.
- High sensitivity: ZCT is highly sensitive and can detect even small amounts of ground fault current. This helps to prevent damage to equipment and reduce the risk of electric shock to personnel.
- Accuracy: ZCT is designed to provide accurate measurements of the zero-sequence component of the current, even in the presence of high levels of noise or interference.
- Non-intrusive installation: ZCT is typically installed around the neutral conductor of a three-phase system, which means that they can be installed without the need to break the circuit or interrupt power to the load.
- Frequency response: ZCT is designed to operate over a wide range of frequencies, typically from 50Hz to 400Hz, which makes them suitable for use in a variety of applications.
- Low burden: ZCT is designed to have a low burden, which means that they do not significantly affect the operation of the circuit or the accuracy of other measurement devices in the system.
- Electric fire monitorin
- Fire prevention and leakage protection system
- Electromagnetic relaying protection
- Microcomputer protection, etc.
How does zero sequence current transformer work
A zero sequence current transformer (ZCT) is a specialized type of current transformer that is used to measure the unbalanced or zero sequence currents in a three-phase power system. These currents are typically caused by faults or disturbances in the system, and they can be difficult to detect and measure accurately.
The ZCT works by using a specially designed core that allows it to measure the vector sum of the three phase currents. This is achieved by winding the primary conductor through the core in a specific configuration, which causes the magnetic field produced by each phase current to cancel out the others.
When a fault or disturbance occurs in the system, it can cause an unbalanced or zero sequence current to flow. This current will not be cancelled out by the magnetic field in the ZCT core, and will instead produce a voltage signal in the secondary winding of the transformer. This voltage signal can then be used to accurately measure the unbalanced or zero sequence current.