What is LXK Zero Sequence Transformer and its function in power system?

Created on 08.14

I. The common names are listed below:

－Zero－sequence current

－Residual current

－Split－core current transformer－

－Earth fault（英）／Ground fault（美）

II. Core role

  1. Ground fault detection:

-Detects unbalanced currents in a three-phase system and is used to detect single-phase ground faults.

  2. Insulation monitoring:

-Combine with relay protection devices (e.g. zero sequence protection relay) to trigger an alarm or trip.

  3. Physical security protection:

-Prevents electric shock in leakage protection systems (RCD/GFCI).

III. Main features

characterization	clarification
1. Open-ended design Non-directional	Snaps onto the cable without disconnecting the line (e.g. AKH-0.66 series). Minimum detection current up to milliamperes (e.g. 30 mA leakage protection). Responds only to zero sequence currents, independent of phase sequence.
2. Electrical performance	- Rated current: usually , (secondary side output). - Accuracy level: - Protection level: 5P, 10P (for trip protection). - Measurement level: 0.5 level (for fault recording or monitoring). - Frequency range: , partially supports wideband harmonic detection (e.g., new energy systems).
3. Installation flexibility	- Application Scenario: - Cable type: directly set on the outside of the cable (such as distribution cabinet outlet). -Bus type: mounted on busbar (e.g. substation grounding wire).

Zero sequence transformers are the core sensors for ground fault monitoring in power systems and are open-ended for easy installation and replacement.

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