Scope of application of zero sequence current transformer

- Apr 08, 2020-

CXRD-LJ series zero-sequence current transformer is a cable type, using ABS engineering plastic shell, resin cast into a fully sealed, good insulation performance, beautiful appearance, high sensitivity, good linearity, reliable operation, easy installation and other characteristics, its performance is excellent For general zero-sequence current transformers. Wide range of applications, not only suitable for electromagnetic relay protection, but also for electronic and microcomputer protection devices Coil grounding) Select the appropriate zero sequence current transformer.

Zero-sequence current transformers are used in a wider range, not only for electromagnetic relay protection, but also for electronic and microcomputer protection devices. Users can according to the system operation mode, the neutral point is effectively grounded or the neutral point is not effectively grounded. Choose the corresponding zero sequence current transformer.

Zero-sequence current transformer is used in conjunction with the relay protection device and signal when the zero-sequence ground current is generated in the power system, so that the device components operate to achieve protection or monitoring. DH-LJ series zero-sequence current transformer makes the cable type, adopts ABS engineering plastic shell, the resin is cast to be fully sealed, the insulation performance is good, and the appearance is beautiful. It has the characteristics of high sensitivity, good linearity, reliable operation and convenient installation. The performance of the device is better than the general zero-sequence current transformer, and the range of use is wider. It is not only suitable for electromagnetic relay protection, but also suitable for electronic and microcomputer protection devices. The user can effectively ground or neutral the neutral point according to the system operation If the point is not effectively grounded, select the corresponding zero sequence current transformer. Principle: The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex current flowing into any node in the circuit is equal to zero. When the line and electrical equipment are normal, the vector sum of each phase current is equal to zero. Therefore, the secondary winding of the zero sequence current transformer has no signal output, and the actuator does not operate. When the ground fault occurs, the vector sum of each phase current is not zero. The fault current causes magnetic flux in the ring core of the zero-sequence current transformer, and the induced voltage on the secondary side of the zero-sequence current transformer causes the actuator to move and drive Trip device to switch the power supply network to achieve the purpose of ground fault protection.

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