Aperçu du produit
Définition fonctionnelle
The JLSZW-35 combined transformateur de mesure is an integrated three-phase pour extérieur measurement device incorporating both voltage transformation and current transformation functions in a single cast-resin insulated assembly. This combined unit provides galvanically isolated secondary voltage and current signals for comptage d’énergie, protection relay operation, and instrumentation applications in 35 kV class AC power distribution systèmes.
Caractéristiques principales
| Article | Spécification (per order / nameplate) |
|---|---|
| Classe de tension système | 35 kV class (pour extérieur substation and distribution applications) |
| Fréquence assignée | 50 Hz (60 Hz available upon request) |
| VT configuration | Two single-phase VTs in V/V connection (measuring three-phase voltages) |
| CT configuration | Two transformateurs de courant in series connection on A-phase and C-phase |
| VT rated voltage ratio | 35000/100 V (nominal) |
| VT classes de précision | 0.2 / 0.5 for mesurage noyaus |
| VT puissance assignée | 30 VA (0.2 class) / 50 VA (0.5 class) |
| CT rated current ratio | 5~200/5 A (ratio adjustable via taps) |
| CT classes de précision | 0.2S / 0.2 for mesurage and protection noyaus |
| CT puissance assignée | 10 VA per noyau as specified |
| CT tenue au court-circuit | Ith = 100×I1n (1 s); Idyn = 2.5×Ith (peak) |
| Niveau d’isolement (all enroulements) | Um = 42 kV / AC withstand = 95 kV / Lightning impulse = 195 kV |
| Normes applicables | IEC 61869-1 / IEC 61869-2 / IEC 61869-3; GB/T 20840 series |
| Environmental protection | Pour extérieur type, IP54 sealed enclosure; no oil, eco-friendly résine coulée |
Présentation du produit
JDZW-35 fully-enclosed résine époxy transformateur de tension (tt)
LZZW-35 Résine époxy Cast Transformateur de courant (TC)
Principe de fonctionnement
The JLSZW-35 integrates two transformateurs de tension and two transformateurs de courant within a single pour extérieur-rated résine époxy enclosure. The transformateur de tension (tt) section employs electromagnetic induction with iron noyaus and secondary enroulements to step down primary voltage to standardized 100 V output. The transformateur de courant (tc) section features toroidal magnetic noyaus with conducteur primaires passing through the apertures; primary current induces proportional flux, delivering standardized 5 A secondary current through connected burden. The V/V voltage connection measures all three phase voltages using only two single-phase VT units. Current measurement on A-phase and C-phase enables three-phase power calculation and overcurrent protection.
Position d’application système
- Pour extérieur Substations: 35 kV pour extérieur switchgear installations and ring main units
- Comptage d’énergie: Revenue-grade three-phase power and energy measurement systèmes
- Circuits de protection: Overvoltage, undervoltage, overcurrent, and earth fault protection relays
- Distribution Monitoring: SCADA systèmes, load monitoring, and power quality measurement
- Replacement Projects: Eco-friendly substitute for immersion dans l’huile combined transformateurs de mesure
Aperçu structurel
Pour extérieur-rated résine époxy cast construction with fully-enclosed weatherproof design ensures superior isolation performance, UV resistance, moisture protection, and pollution resistance. The pole-mounted or platform-mounted configuration provides space-efficient installation in pour extérieur substations while maintaining excellent electrical clearances and mechanical strength under environmental stress.
Désignation du modèle
Model Explication du code
- J — Instrument transformer (general designation)
- L — Current transformer function included
- S — Three-phase configuration (三相)
- Z — Pillar/post type mounting structure
- W — Pour extérieur service (户外)
- 35 — Voltage class (kV)
Configuration Details
The JLSZW-35 combined transformateur de mesure integrates voltage and current measurement functions:
- Voltage Section: Two single-phase transformateurs de tension connected in V/V configuration, providing three-phase voltage measurement from two units
- Current Section: Two window-type transformateurs de courant installed in series on A-phase and C-phase conducteur primaires
- Integration: All components mounted within a single pour extérieur-rated résine époxy enclosure for space efficiency and reduced installation complexity
Conditions de service
The JLSZW-35 combined transformateur de mesure is designed for pour extérieur operation under specified conditions environnementales in medium-voltage power distribution systèmes.
- Environnement d’installation: Pour extérieur installation (protected from direct exposure to severe precipitation where applicable)
- Altitude: Not exceeding 2000 m above sea level (higher altitude shall be specified for engineering confirmation and isolation coordination adjustment)
- Température ambiante: −40 °C to +40 °C
- Humidité relative: Daily average ≤ 95%, monthly average ≤ 90% (condensation conditions accounted for in design)
- Conditions environnementales: Pour extérieur pollution environment per IEC 60815 classification (pollution severity level to be specified); no explosive or flammable atmosphere; mechanical shock and vibration per applicable standard
- UV exposure: Epoxy resin formulation includes UV stabilizers for long-term pour extérieur service
Construction
Conception de construction
- Structure: Post (pillar) type for pour extérieur platform or pole mounting
- Isolation: Fully enclosed vacuum-cast résine époxy isolation système (pour extérieur-rated formulation)
- VT Noyau: Silicon steel laminated noyaus with secondary enroulements; V/V connection topology
- CT Noyau: Ring-type (window-type) magnetic noyaus with adjustable ratio taps
- Enclosure: Weather-sealed résine époxy housing with IP54 protection rating; UV-resistant surface treatment
- Terminals: Pour extérieur-rated terminal blocks with tracking-resistant barriers and sealing glands
The pour extérieur résine époxy casting provides stable isolation properties and resistance to moisture, UV radiation, thermal cycling, contamination, and aging for long-term pour extérieur service without oil maintenance.
Enroulements & Terminal Marking
Transformateur de tension (TT) Terminals:
- Bornes primaires (VT1): A-X (U1-U2)
- Bornes primaires (VT2): C-X (W1-W2)
- Bornes secondaires (VT1): a-x (u1-u2)
- Bornes secondaires (VT2): c-x (w1-w2)
Transformateur de courant (TC) Terminals:
- Bornes primaires (CT on A-phase): P1-P2
- Bornes primaires (CT on C-phase): P1-P2
- Bornes secondaires (CT A-phase, Noyau 1): 1S1-1S2
- Bornes secondaires (CT C-phase, Noyau 1): 1S1-1S2
Terminal markings follow standard VT and CT polarity conventions per IEC 61869. Correct terminal identification and polarity verification shall be observed to ensure mesurage accuracy and protection relay performance.
Données techniques
This section provides selection-oriented données techniques for the JLSZW-35 three-phase pour extérieur résine époxy combined transformateur de mesure used in 35 kV class AC systèmes (50 Hz). Data shown below is intended for preliminary selection of voltage ratio, current ratio, classe de précision combinations, puissance assignées, and tenue au court-circuit capability.
Definitions: VT classe de précision indicates mesurage precision for voltage measurement. CT classe de précision combination indicates available mesurage/protection noyaus. Rated output (VA) is specified per secondary noyau. Ith is the rated courant thermique de courte durée for CT (typically 1 s). Idyn is the courant dynamique assigné (peak) for CT.
Notation: VT and CT spécifications are independent within the combined unit. Customer shall specify VT ratio, VT accuracy, VT burden, CT ratio, CT accuracy, and CT burden according to project mesurage and protection requirements.
VT Technical Parameters
| Model | Rated Voltage Ratio (V) |
Accuracy Class |
Rated Output (VA) |
Limit Output (VA) |
Rated Isolation Level (kV) |
|---|---|---|---|---|---|
| JLSZW-35 | 35000/100 | 0.2 | 30 | 500 | 42/95/195 |
| JLSZW-35 | 35000/100 | 0.5 | 50 | 500 | 42/95/195 |
CT Technical Parameters
| Model | Current Ratio (A) |
Accuracy Class |
Rated Output (VA) |
Thermal Stability Current (kA) |
Dynamic Stability Current (kA) |
Rated Isolation Level (kV) |
|---|---|---|---|---|---|---|
| JLSZW-35 | 5~200/5 | 0.2S | 10 | 100×I1n | 2.5×Ith | 42/95/195 |
| JLSZW-35 | 5~200/5 | 0.2 | 10 | 100×I1n | 2.5×Ith | 42/95/195 |
Normes & Normative References
| Standard | Titre | Application |
|---|---|---|
| IEC 61869-1 | Transformateurs de mesure – Partie 1: Exigences générales | Exigences générales for VT and CT |
| IEC 61869-2 | Transformateurs de mesure – Partie 2: Exigences supplémentaires pour transformateurs de courant | CT-specific requirements |
| IEC 61869-3 | Transformateurs de mesure – Part 3: Exigences supplémentaires for Inductive Transformateurs de tension | VT-specific requirements |
| GB/T 20840.1 | Transformateurs de mesure – Partie 1: Exigences générales | Norme nationale (aligned with IEC 61869 framework) |
| GB/T 20840.2 | Transformateurs de mesure – Partie 2: Transformateurs de courant | National CT requirements |
| GB/T 20840.3 | Transformateurs de mesure – Part 3: Inductive Transformateurs de tension | National VT requirements |
| IEC 60815 | Selection and Dimensioning of High-Voltage Insulators for Polluted Conditions | Pour extérieur isolation design under pollution |
| IEC 60068-2-1 | Tests environnementaux – Cold | Low temperature performance verification |
| IEC 60068-2-2 | Tests environnementaux – Dry Heat | High temperature performance verification |
Conformité aux tests d’usine
- Tests de routine (VT) per IEC 61869-3 / GB/T 20840.3 (including polarity/marking, vérification du rapport, vérification de la précision per specified class and burden, and tests diélectriques)
- Tests de routine (CT) per IEC 61869-2 / GB/T 20840.2 (including polarity/marking, vérification du rapport, vérification de la précision per specified class and burden, and tests diélectriques)
- Tests diélectriques per isolation coordination requirements: AC withstand voltage test, test de tenue aux chocs de foudre
- Test de décharge partielle where specified by project requirement or per applicable standard
- Inspection visuelle et dimensionnelle including marking, terminal arrangement, and workmanship conformity
- Tests de type et spéciaux as required by project spécification (including thermal stability, dynamic stability, pour extérieur environmental tests)
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformateur combiné shall be securely mounted using the designated fixing base or mounting bracket on pour extérieur platform or pole structure.
- Primary busbar connections shall be made through the designated bornes primaires for both VT and CT sections with appropriate torque spécification.
- Dégagement adéquat shall be maintained for isolation coordination, heat dissipation, and maintenance access per applicable pour extérieur installation standard.
- Grounding connections shall be provided on the metallic mounting base and secondary neutral points per local electrical safety code.
Contours
JLSZW-35 Pour extérieur Combined Transformateur de mesure
Notes de sécurité
- VT circuit secondaires shall be protected with appropriate fuses to prevent secondary short-circuit damage.
- CT circuit secondaire must never be left open when the transformer is energized, as dangerous high voltage may appear across the bornes secondaires.
- Pendant l’inspection or maintenance, all circuit secondaires shall be short-circuited and grounded before disconnecting any instruments or relays.
- Un point of each VT circuit secondaire and each CT circuit secondaire should be reliably grounded in accordance with normes applicables.
- Toute installation, operation, and maintenance work shall comply with local electrical safety regulations for pour extérieur high-voltage equipment.
- Observe proper clearances and approach distances per applicable pour extérieur substation safety normes.
Informations de commande
Lors de la commande, the required configuration shall be specified according to the local grid requirements, normes applicables, and project technical spécification. The following parameters shall be clearly stated for technical confirmation and production release:
VT Selection: Determine rated primary voltage from système nominal voltage (e.g., 35 kV système). Select classe de précision based on mesurage requirements (0.2 for revenue mesurage, 0.5 for indication). Confirmer la charge assignée (VA) from sum of connected meters, transducers, relays, and wiring losses.
CT Selection: Déterminer le courant primaire assigné from feeder/load rating and expected operating range. Select classe de précision 0.2S for revenue mesurage or 0.2 for general mesurage. Confirmer la charge assignée (VA) for each circuit secondaire based on connected instruments and wiring losses. Vérifier la capacité de tenue au court-circuit (Ith/Idyn) against système prospective fault current.
If local utility or project requirements apply (e.g., special niveau d’isolement, ice/snow loading, seismic rating, terminal arrangement, mounting constraints, documentation language, or required certificates), specify them at the ordering stage. Special configurations and non-standard ratings shall be confirmed by technical agreement and final data sheet prior to production.