Aperçu du produit
The JLS-20KV pour extérieur immersion dans l’huile combined transformateur de mesure, is a precision electromagnetic mesurage and measurement solution designed for high-voltage AC power systèmes. This integrated unit comprises two single-phase fully-insulated transformateurs de tension (VT) configured in three-phase V/V connection and two transformateurs de courant (CT) series-connected in A-phase and C-phase, providing simultaneous current and voltage transformation for pour extérieur substation applications.
Caractéristiques principales
| Article | Spécification (per order / nameplate) |
|---|---|
| Classe de tension système | 20 kV / 22 kV class (pour extérieur distribution and substation applications) |
| Fréquence assignée | 50 Hz / 60 Hz |
| Courant secondaire assigné (CT) | 1 A or 5 A |
| Rated secondary voltage (VT) | 100 V / 100/√3 V (line-to-ground) in V/V configuration |
| Classes de précision (CT) | 0.2, 0.2S, 0.5 for mesurage applications as specified |
| Classes de précision (VT) | 0.2, 0.5 for mesurage applications as specified |
| Connection configuration | Two VT units in V/V connection; two CT units in A-phase and C-phase |
| Isolation structure | Oil-immersed, fully-insulated design |
| Moisture protection | Anti-moisture device integrated on tank cover |
| Normes applicables | GB 17201-2006 (mesurage box); GB/T 20840.1-2010, GB/T 20840.2-2014 (CT); GB/T 20840.1-2010, GB/T 20840.3-2013 (VT) |
| Environnement d’installation | Pour extérieur substation, distribution, and mesurage applications |
Présentation du produit
Principe de fonctionnement
The JLS-20 transformateur combiné operates on electromagnetic induction principles. The transformateur de tension (tt) section converts high-voltage signals to standardized low-voltage output through magnetic coupling, while the transformateur de courant (tc) section provides galvanically isolated current signals proportional to primary current. The V/V connection configuration enables three-phase voltage measurement using two single-phase VT units, providing economical and space-efficient voltage transformation for pour extérieur mesurage installations.
Position d’application système
- Pour extérieur Distribution Systèmes: 20 kV / 22 kV pour extérieur substations and distribution networks
- Comptage d’énergie: Revenue-grade electricity measurement with active and reactive energy meters
- Rural Electrification: Pour extérieur substations in rural and agricultural power supply systèmes
- Industrial Installations: Small-scale industrial substations and power transformation facilities
- Urban Distribution: Compact pour extérieur mesurage cabinets in urban distribution networks
Aperçu structurel
Oil-immersed construction with fully-enclosed square tank design ensures superior isolation performance, environmental protection, and long service life. The integrated mounting configuration combines VT and CT functions in a single compact unit, reducing footprint and installation complexity in pour extérieur environments. The moisture-resistant tank cover prevents moisture ingress, extending equipment service life and enhancing resistance to harsh pour extérieur conditions.
Désignation du modèle
Model Explication du code
- J — Mesurage box / Combined transformer assembly
- L — Current transformer (CT) component
- S — Pour extérieur (Shi Wai) installation type
- 20 — Voltage class (20 kV nominal, also applicable to 22 kV systèmes)
- KV — Voltage unit designation
Configuration Details
The JLS-20KV and JLS-22KV models are functionally identical, with voltage class designation adapted to regional grid normes (20 kV or 22 kV nominal système voltage). The transformateur combiné integrates two single-phase transformateurs de tension in V/V configuration and two transformateurs de courant in series connection (A-phase and C-phase), providing comprehensive three-phase mesurage capability in a single pour extérieur-rated enclosure.
Conditions de service
The JLS-20KV series transformateur combinés are designed for pour extérieur operation under specified conditions environnementales in medium-voltage power distribution systèmes.
- Environnement d’installation: Pour extérieur installation in substations and distribution facilities
- Altitude: ≤ 2000 m above sea level (higher altitude shall be specified for engineering confirmation)
- Température ambiante: −40 °C to +40 °C
- Humidité relative: Monthly average ≤ 90%
- Système frequency: 50 Hz / 60 Hz AC systèmes
- Conditions environnementales: Free from corrosive gases, flammable media, and severe pollution; no excessive vibration or mechanical shock
- Lightning protection: Zinc oxide surge arrester required within 1 meter of installation for lightning protection
Construction
Conception de construction
- Structure: Pour extérieur immersion dans l’huile combined configuration
- Tank design: Square sealed oil tank with lifting ring on top cover
- Isolation medium: Transformer oil immersion for VT and CT components
- VT configuration: Two single-phase fully-insulated transformateurs de tension in V/V connection
- CT configuration: Two electromagnetic transformateurs de courant series-connected in A-phase and C-phase
- Moisture protection: Anti-moisture device on tank cover with breathing mechanism
- Monitoring features: Oil level indicator, grounding terminal, and oil drain valve
- Mounting: Fixed installation on pole plate within oil tank assembly
The immersion dans l’huile design provides stable isolation properties and thermal management for long-term pour extérieur service. The integrated moisture barrier extends service life by preventing moisture ingress into the oil, which is a common degradation mechanism in pour extérieur transformer installations.
Enroulements & Terminal Marking
Transformateur de courant (TC) Terminals:
- Bornes primaires (A-phase CT): P1A / P2A
- Bornes secondaires (A-phase CT): S1A / S2A
- Bornes primaires (C-phase CT): P1C / P2C
- Bornes secondaires (C-phase CT): S1C / S2C
Transformateur de tension (TT) Terminals:
- Bornes primaires (VT Unit 1): A / X (line-to-ground)
- Bornes secondaires (VT Unit 1): a / x (100 V output)
- Bornes primaires (VT Unit 2): B / X (line-to-ground, shared neutral)
- Bornes secondaires (VT Unit 2): b / x (100 V output)
Terminal markings follow standard transformateur de mesure polarity conventions. Correct terminal identification shall be observed to ensure proper three-phase mesurage performance in V/V configuration and accurate energy measurement.
Données techniques
This section provides selection-oriented données techniques for the JLS-20KV pour extérieur immersion dans l’huile combined transformateur de mesure used in 20 kV / 22 kV class AC systèmes (50 Hz / 60 Hz). Data shown below is intended for preliminary selection of transformation ratios, classes de précision, charge assignées, and environmental spécifications.
Definitions: Transformation ratio (CT) indicates primary to secondary current ratio (e.g., 50/5 A, 100/5 A). Transformation ratio (VT) indicates primary to secondary voltage ratio (e.g., 20000/100 V). Accuracy class defines measurement precision for mesurage applications. Charge assignée (VA) is specified per secondary output. Moisture protection indicates anti-moisture device status.
Notation: Spécifications may vary based on customer requirements and regional grid normes. Acceptance shall be based on nameplate values and factory test report.
Normes & Normative References
| Standard | Titre | Application |
|---|---|---|
| GB 17201-2006 | Mesurage Box for Electricity Mesurage | Combined mesurage box requirements |
| GB/T 20840.1-2010 | Transformateurs de mesure – Partie 1: Exigences générales | Exigences générales for CT and VT |
| GB/T 20840.2-2014 | Transformateurs de mesure – Partie 2: Transformateurs de courant | CT-specific requirements |
| GB/T 20840.3-2013 | Transformateurs de mesure – Part 3: Transformateurs de tension | VT-specific requirements |
| IEC 61869-1 | Transformateurs de mesure – Partie 1: Exigences générales | International exigences générales (reference) |
| IEC 61869-2 | Transformateurs de mesure – Partie 2: Exigences supplémentaires pour transformateurs de courant | International CT requirements (reference) |
| IEC 61869-3 | Transformateurs de mesure – Part 3: Exigences supplémentaires for Inductive Transformateurs de tension | International VT requirements (reference) |
| DL/T 448-2000 | Spécifications techniques for Pour extérieur Immersion dans l’huile Transformateurs de mesure | Optionnel (pour extérieur immersion dans l’huile transformer reference) |
Conformité aux tests d’usine
- Tests de routine per GB/T 20840 series and GB 17201-2006 (including polarity/marking verification, vérification du rapport, vérification de la précision per specified class and burden for both CT and VT components)
- Tests diélectriques per isolation coordination requirements and applicable standard
- Oil quality tests per transformer oil spécification (dielectric strength, moisture content, acidity)
- Test de décharge partielle where specified by the project requirement
- Inspection visuelle et dimensionnelle including marking, workmanship conformity, and moisture protection device verification
- Tests de type et spéciaux as required by the project spécification
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformateur combiné shall be securely mounted on pour extérieur support structure or platform using designated fixing holes and mounting brackets.
- Primary connection may be made via overhead line conductors or busbar terminals, depending on installation configuration.
- Dégagement adéquat shall be maintained for isolation coordination, heat dissipation, oil level monitoring, and maintenance access.
- Grounding terminal shall be reliably connected to substation grounding grid.
- Zinc oxide surge arrester installation is mandatory within 1 meter of the transformateur combiné for lightning protection.
Outline Dimensions
Safety & Operational Notes
- CT circuit secondaires: Circuit secondaires must never be left open when the transformer is energized, as dangerous high voltage may appear across the bornes secondaires.
- VT circuit secondaires: Pendant l’inspection or maintenance, the circuit secondaire shall be isolated and protective measures applied before disconnecting any meters or instruments.
- Grounding: Un point of each circuit secondaire should be reliably grounded in accordance with GB normes and local regulations.
- Lightning protection: Zinc oxide surge arrester installation within 1 meter is mandatory for pour extérieur installations to protect against lightning surges.
- Oil monitoring: Regular inspection of oil level, moisture protection device, and sealing integrity is required to ensure stable operation and extended service life.
- Moisture protection: For 0.2 and 0.2S classe de précision units, verify that breathing hole plug has been removed from moisture protection device prior to energization.
- Toute installation and maintenance work shall comply with local electrical safety regulations and utility grid connection 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:
- Classe de tension système: 20 kV or 22 kV
- VT transformation ratio: Primary voltage / secondary voltage (e.g., 20000/100 V, 22000/100 V)
- CT transformation ratio: Primary current / secondary current (e.g., 50/5 A, 100/5 A, 150/5 A)
- Courant secondaire assigné (CT): 1 A or 5 A
- Accuracy class requirements (VT): 0.2, 0.5, or as specified
- Accuracy class requirements (CT): 0.2, 0.2S, 0.5, or as specified
- Charge assignée (VT): VA rating per secondary winding
- Charge assignée (CT): VA rating per secondary noyau
- Exigences de tenue au court-circuit (CT): Ith (1 s) and Idyn (peak)
- Niveau d’isolement: Per local grid spécification and conditions environnementales
- Conditions environnementales: Altitude, temperature range, pollution severity, and other site-specific factors
- Customization requirements: Tank dimensions, terminal configuration, special markings, or other custom features
If special configurations are required (e.g., custom tank dimensions, specific terminal arrangements, special oil spécifications, documentation language requirements, or certification needs), specify them at the ordering stage. Custom configurations shall be confirmed by technical agreement and final datasheet prior to production.