The CXRD-LJ series zero-sequence current transformer is of the cable type, featuring an ABS engineering plastic housing and fully sealed resin casting. It boasts excellent insulation performance, elegant appearance, high sensitivity, good linearity, reliable operation, and convenient installation. Its performance surpasses that of ordinary zero-sequence current transformers. With a wide range of applications, it not only adapts to electromagnetic relay protection but also to electronic and microcomputer protection devices. Users can select the appropriate zero-sequence current transformer based on the system's operation mode (neutral grounding, neutral non-grounding, high resistance grounding, low resistance grounding, arc suppression coil grounding).

Zero-sequence current transformers have a wider range of applications, not only adapting to electromagnetic relay protection but also to electronic and microcomputer protection devices. Users can select the appropriate zero-sequence current transformer based on the system's operation mode, whether the neutral point is effectively grounded or not effectively grounded

The zero-sequence current transformer is used in conjunction with relay protection devices and signals when generating zero-sequence grounding current in the power system, enabling device components to actuate and achieve protection or monitoring. The DH-LJ series of zero-sequence current transformers are cable-type, with ABS engineering plastic casings and fully sealed resin casting, providing good insulation performance and an aesthetically pleasing appearance. They feature high sensitivity, good linearity, reliable operation, and convenient installation. Their performance is superior to that of general zero-sequence current transformers, with a wider range of applications. They are not only suitable for electromagnetic relay protection but also for electronic and microcomputer protection devices. Users can select the appropriate zero-sequence current transformer based on the system's operation mode, whether the neutral point is effectively grounded or not. Principle: The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of complex currents flowing into any node in the circuit is equal to zero. Under normal conditions of lines and electrical equipment, the vector sum of the phase currents is equal to zero. Therefore, the secondary side winding of the zero-sequence current transformer has no signal output, and the actuator does not actuate. When a ground fault occurs, the vector sum of the phase currents is not equal to zero. The fault current generates magnetic flux in the toroidal core of the zero-sequence current transformer, and the induced voltage on the secondary side of the transformer actuates the actuator, driving the trip device to switch the power supply network, achieving the purpose of ground fault protection.