Aperçu du produit
Définition fonctionnelle
The JSZV12-20R three-phase résine époxy combination transformateur de tension (tt) with built-in fuse protection is specifically designed for XGW-12 pour extérieur AC fixed metal-enclosed switchgear applications. This transformateur de tension (tt) provides both 100V measurement voltage output and 220V operating power supply, delivering stable power to circuit breakers while ensuring reliable operation and système efficiency.
Caractéristiques principales
| Article | Spécification |
|---|---|
| Classe de tension système | 12 kV class (pour extérieur switchgear applications, rated 20 kV) |
| Fréquence assignée | 50 Hz |
| Rated primary voltage | 20 kV / √3 |
| Rated secondary voltage | 100V, 220V (as specified) |
| Classes de précision | 0.2, 0.5 (mesurage applications) |
| Primary connection | V-connection (open-delta) |
| Fuse protection | Built-in primary winding fuse protection |
| Niveau d’isolement | 24/65/125 kV (Um/Ud/Up) |
| Normes applicables | GB 1207-1997 |
Principe de fonctionnement
Operating on electromagnetic induction principles, the transformateur de tension (tt) features three-phase résine époxy cast noyaus with primary and secondary enroulements. The transformer steps down high voltage to standardized measurement and auxiliary supply voltages, providing galvanically isolated secondary outputs proportional to primary voltage. The V-connection configuration enables voltage measurement with two single-phase units while also detecting ground faults in the système.
Position d’application système
- Distribution moyenne tension: 12-20kV pour extérieur metal-enclosed switchgear (XGW-12 series)
- Voltage Mesurage: Revenue-grade electricity measurement and voltage monitoring systèmes
- Auxiliary Power Supply: Providing operating power for circuit breaker control and circuits de protection
- Protection Schemes: Overvoltage, undervoltage, and ground fault protection applications
Aperçu structurel
Epoxy resin cast construction with fully-enclosed design ensures superior isolation performance, moisture resistance, and mechanical strength. The built-in fuse protection located at the primary output terminals provides easy replacement and maintenance access. The compact structure integrates voltage measurement and auxiliary power supply functions in a single unit, optimizing installation space in metal-enclosed switchgear environments.
Désignation du modèle
Model Explication du code
- J — Voltage transformer (VT)
- S — Three-phase configuration
- Z — Cast-resin (epoxy) insulated structure
- V — V-connection (open-delta) configuration
- 12 — Voltage class (kV)
- 20 — Rated voltage (kV)
- R — Built-in fuse protection
Conditions de service
The JSZV12-20R transformateur de tension (tt) is designed for pour extérieur metal-enclosed switchgear installation under normal conditions de service in medium-voltage power systèmes.
- Environnement d’installation: Pour extérieur metal-enclosed switchgear (XGW-12)
- Altitude: ≤1000 m above sea level (pollution level II)
- Température ambiante: −5°C to +40°C
- Humidité relative: ≤80%
- Conditions environnementales: Free from corrosive gases or vapor; free from carbon dust or conductive metallic dust; no severe vibration or mechanical shock
Construction
Conception de construction
- Structure: Three-phase combination type for pour extérieur switchgear
- Isolation: Fully enclosed résine époxy cast isolation
- Connection: V-connection (open-delta) configuration
- Protection: Built-in fuse at primary output terminals
- Système: Integrated voltage measurement and auxiliary power supply
The résine époxy casting provides stable isolation properties with excellent resistance to moisture, contamination, and aging for long-term pour extérieur switchgear service. The built-in fuse protection système prevents primary winding short-circuit conditions, enhancing overall système safety and reliability.
Enroulements & Terminal Marking
- Bornes primaires: A, B, C (phase connections)
- Bornes secondaires (100V): a, b, c, n (measurement voltage output)
- Bornes secondaires (220V): 110V and 220V auxiliary power terminals
Terminal markings follow standard VT polarity conventions. Correct terminal identification shall be observed to ensure mesurage accuracy and protection performance. The auxiliary power terminals provide stable operating voltage for circuit breaker control circuits and protection relays.
Données techniques
This section provides selection-oriented données techniques for the JSZV12-20R three-phase résine époxy combination transformateur de tension (tt) with built-in fuse used in 12-20 kV class AC systèmes (50 Hz). Data shown below is intended for preliminary selection of voltage ratio, classe de précision, and puissance assignée capacity.
Definitions: Accuracy class indicates mesurage performance level. Rated output (VA) is the maximum burden that can be connected while maintaining specified accuracy. Load power factor is assumed as cosφ = 0.8 (lagging).
Référence des données
| Model | Rated Voltage Ratio (V) |
Class 0.2 Output (VA) |
Class 0.5 Output (VA) |
Rated Isolation Level (kV) |
|---|---|---|---|---|
| JSZV12-20R | 20000/100 | 30 | 50 | 24/65/125 |
| JSZV12-20R | 20000/100/100 | 20 | 50 | 24/65/125 |
| JSZV12-20R | 20000/220 | 20 | 50 | 24/65/125 |
| JSZV12-20R | 20000/100/220 | 20 | 50 | 24/65/125 |
Normes & Normative References
| Standard | Titre | Application |
|---|---|---|
| GB 1207-1997 | Transformateurs de tension | VT exigences générales and testing |
| IEC 61869-3 | Transformateurs de mesure – Part 3: Transformateurs de tension | Optionnel (international reference) |
Conformité aux tests d’usine
- Tests de routine per GB 1207-1997 requirements (including polarity verification, vérification du rapport, and vérification de la précision per specified class and burden)
- Tests diélectriques per isolation coordination requirements and applicable standard
- Inspection visuelle et dimensionnelle including marking and workmanship conformity
- Tests de type et spéciaux as required by the project spécification
Installation & Dimensions
Outline
Principle diagram
- Outline dimensions and mounting details are provided in the switchgear documentation
- Le transformateur doit être securely mounted using the designated fixing holes within the XGW-12 switchgear compartment
- Primary connections are made via busbar terminals integrated with the switchgear design
- Dégagement adéquat shall be maintained for isolation, heat dissipation, and maintenance access
- Built-in fuse protection is accessible from the front panel for easy replacement
Notes de sécurité
- Circuit secondaire must be properly grounded in accordance with normes applicables
- Pendant l’inspection or maintenance, the primary circuit shall be de-energized and properly isolated
- Fuse replacement shall only be performed by qualified personnel following proper safety procedures
- Toute installation and maintenance work shall comply with local electrical safety regulations
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:
- Rated voltage ratio (primary/secondary voltage)
- Rated secondary voltage (100V, 220V, or combined configuration)
- Accuracy class (0.2 or 0.5 for mesurage applications)
- Charge assignée (VA) for each secondary winding
- Application requirements (voltage measurement and/or auxiliary power supply)
If local utility or project requirements apply (e.g., niveau d’isolement, terminal arrangement, mounting constraints, documentation language, or required certificates), specify them at the ordering stage. Special configurations shall be confirmed by technical agreement and final data sheet prior to production.