Zero sequence current transformer for 35kV and below voltage systems. Used for cable ground protection in small grounding current systems. Rated frequency 50Hz or 60Hz. Available in Φ75, Φ110, Φ125 inner diameter sizes. Primary insulation guaranteed by cable, secondary winding insulation tested. Compliant with IEC 61869 and GB/T 20840 standards. Matching relay model DL-11/0.2, epoxy resin cast construction.
Zero-sequence current transformer for 35kV and below systems, designed for cable ground fault protection in small grounding current systems. Suitable for outdoor pole-mounted circuit breaker applications.
| Paramètre | Spécification | Vérification |
|---|---|---|
| Type de produit | Current Transformer | IEC 61869, GB/T 20840 |
| Code modèle | LJZ-75-110-125 | Marquage de la plaque constructeur |
| Tension primaire | Up to 35kV | Essai de tension nominale (IEC 61869-1/3) |
| Tension secondaire | [On Request] | Vérification du rapport à la fréquence nominale |
| Classe de précision | [On Request] | Essai de précision (IEC 61869-2 / IEEE C57.13) |
| Charge nominale | [On Request] | Essai de charge à la puissance VA nominale |
| Type d'isolement | Dry Epoxy Resin | Essais diélectriques selon la norme |
| Niveau d'isolement (BIL) | [On Request] | Tenue à fréquence industrielle et au choc de foudre |
| Normes | IEC 61869, GB/T 20840 | Certifié selon les normes listées |
| Fréquence | 50/60Hz | Selon IEC 61869-1 |
| Environnement | Epoxy resin cast | Selon les limites de la fiche technique |
Idéal pour
Non recommandé pour
Connect secondary terminals 1S1 and 1S2 to the protection relay. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Ensure the primary cable passes through the CT window (Φ75/Φ110/Φ125) and is properly insulated for the system voltage.
Conforme à : IEC 61869, GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q : What is the primary voltage rating?
R : Up to 35kV.
Q : What are the available inner diameters?
R : Φ75, Φ110, and Φ125.
Q : What standards does it comply with?
R : IEC 61869 and GB/T 20840.
Les champs manquants sont marqués [On Request] — jamais inventés. Les lignes de vérification M2/M5/M6 suivent les conventions IEC 61869 / IEEE C57.13.
| Connecting lead resistance (Ω) | Total secondary external impedance (Ω) | Relay pickup current (A) | Sensitivity (A) | Relay scale (A) |
|---|---|---|---|---|
| 1 | ≤10 | 0.1 | ≤10 | 0.1-0.2 |
Dessin d'encombrement et de dimensions du LJZ-75-110-125 — cliquez sur l'image pour zoomer / afficher l'original.
