Aperçu du produit
Définition fonctionnelle
The JLSZY-35 series combined transformateur de mesure is a precision pour extérieur measurement and protection device designed for simultaneous voltage and current measurement in three-phase AC power systèmes. Operating at the 35 kV voltage class with fréquence assignée of 50 Hz, this unit integrates transformateurs de tension (PT) and transformateurs de courant (CT) in a single cast résine époxy enclosure, providing galvanically isolated secondary signals for comptage d’énergie, revenue measurement, and relay protection applications in pour extérieur substations and industrial distribution systèmes.
Product Show
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) |
| PT rated voltage ratio | 35000/100 V (three-phase système) |
| CT rated current ratio | 5~200/5 A (per spécification) |
| PT classes de précision | 0.2 or 0.5 for mesurage applications |
| CT classes de précision | 0.2S or 0.2 for mesurage applications |
| PT charge assignée | 30 VA (class 0.2) or 50 VA (class 0.5) |
| CT charge assignée | 10 VA |
| PT limiting output | 500 VA |
| CT tenue au court-circuit | Ith: 100×I1n (thermal), Idyn: 2.5×Ith (dynamic) |
| Rated niveau d’isolement | 42/95/195 kV (Um/Ud/Up) |
| Normes applicables | GB/T 20840.4-2015 (transformateur combinés); GB/T 20840.1-2010, 20840.2-2014 (CT); GB/T 20840.1-2010, 20840.3-2013 (PT) |
| PT connection configuration | V/V connection using two single-phase units |
| CT installation positions | Phase A and Phase C (two-element mesurage) |
Principe de fonctionnement
Transformateur de tension (TT) (PT) Section: Two single-phase fully-insulated transformateurs de tension connected in V/V configuration provide three-phase voltage measurement. Operating on electromagnetic induction principles, the primary winding exposed to système voltage induces proportional secondary voltage (100 V line-to-neutral) for mesurage and protection devices.
Transformateur de courant (TC) (CT) Section: Two toroidal transformateurs de courant installed on Phase A and Phase C utilize Faraday’s law to convert primary current to standardized 5 A secondary output. The magnetic noyau with conducteur primaire passing through the aperture generates flux proportional to primary current, inducing secondary voltage that drives burden-connected instruments.
Position d’application système
- 35 kV Pour extérieur Substations: Urban and rural distribution substations requiring combined voltage and current measurement
- Revenue Mesurage: Utility-grade three-phase energy measurement for billing and load monitoring
- Industrial Distribution: High-voltage industrial feeders and plant distribution systèmes
- Grid Monitoring: SCADA integration and supervisory control systèmes requiring simultaneous V/I measurement
- Relay Protection: Overcurrent, overvoltage, and distance protection schemes
Aperçu structurel
The JLSZY-35 employs a post-type pour extérieur design with fully-enclosed résine époxy cast construction. The integrated housing contains both PT and CT elements in a single mechanical assembly, providing UV resistance, anti-aging properties, and pollution performance suitable for harsh pour extérieur environments. The maintenance-free design eliminates oil-filled transformer concerns while delivering superior isolation performance and mechanical strength for long-term pour extérieur service.
Désignation du modèle
Model Explication du code
- J — Combined transformateur de mesure
- L — Current element (CT component)
- S — Voltage element (PT component: three-phase)
- Z — Cast-resin (epoxy) insulated structure
- Y — Pour extérieur (户外) application type
- 35 — Voltage class (kV)
Conditions de service
The JLSZY-35 series combined transformateur de mesure is designed for pour extérieur operation under normal conditions de service in 35 kV power distribution systèmes.
- Environnement d’installation: Pour extérieur installation (pole-mounted or platform-mounted)
- Altitude: Not exceeding 1000 m above sea level (higher altitude shall be specified for engineering confirmation and correction factors applied)
- Température ambiante: −25 °C to +40 °C (pour extérieur duty cycle)
- Humidité relative: Daily average ≤ 95%, monthly average ≤ 90% (condensation permissible with pour extérieur-rated isolation)
- Conditions environnementales: Suitable for pour extérieur exposure including UV radiation, precipitation, and pollution; pollution severity class per IEC 60815 or project spécification; free from explosive or corrosive atmospheres
- Earthquake resistance: Seismic intensity ≤ 8 degrees (Chinese seismic code) or per regional requirement
Construction
Conception de construction
- Overall structure: Post-type pour extérieur combined unit
- Enclosure material: Fully-enclosed résine époxy cast isolation with UV-stabilized formulation
- PT configuration: Two single-phase transformateurs de tension in V/V connection (fully-insulated type)
- CT configuration: Two ring-type transformateurs de courant on Phase A and Phase C
- Bornes secondaires: Weather-sealed terminal compartment with clearly marked connections
- Mounting: Base-mounted with fixing holes for concrete foundation or steel structure
The résine époxy casting provides stable dielectric properties, resistance to moisture ingress, UV degradation, and surface contamination, ensuring reliable long-term pour extérieur service. The maintenance-free construction eliminates oil handling and environmental risks associated with traditional liquid-filled transformers.
Enroulements & Terminal Marking
Transformateur de tension (TT) Terminals:
- Bornes primaires (PT): A, B, C (phase connections); N (neutral, if applicable)
- Bornes secondaires (PT): a, b, c (line-to-neutral 100 V outputs); n (neutral point)
Transformateur de courant (TC) Terminals:
- Bornes primaires (CT): P1 / P2 (Phase A); P1 / P2 (Phase C)
- Bornes secondaires (CT, Phase A): 1S1 / 1S2
- Bornes secondaires (CT, Phase C): 2S1 / 2S2
Terminal markings follow standard polarity conventions per GB/T 20840 series. Correct terminal identification and polarity observation are essential for accurate mesurage and protection operation. CT secondary taps (where provided) enable ratio adjustment in the field.
Données techniques
This section provides selection-oriented données techniques for the JLSZY-35 pour extérieur three-phase combined transformateur de mesure used in 35 kV class AC systèmes (50 Hz). Data shown below is intended for preliminary selection of voltage and current transformation ratios, classes de précision, charge assignées, and isolation coordination.
Definitions: PT rated voltage ratio is the primary-to-secondary voltage transformation for the voltage element. CT rated current ratio is the primary-to-secondary current transformation for the current element. Charge assignée (VA) is specified per secondary output. Ith is the rated courant thermique de courte durée. Idyn is the courant dynamique assigné (peak). Niveau d’isolement is expressed as Um/Ud/Up (maximum système voltage / power-frequency withstand / lightning impulse withstand).
Référence des données
Transformateur de tension (TT) Données techniques
| Model | Rated Voltage Ratio (V) |
Accuracy Class |
Rated Output (VA) |
Limiting Output (VA) |
Rated Isolation Level (kV) |
|---|---|---|---|---|---|
| JLSZY-35 | 35000/100 | 0.2 | 30 | 500 | 42/95/195 |
| JLSZY-35 | 35000/100 | 0.5 | 50 | 500 | 42/95/195 |
Transformateur de courant (TC) Données techniques
| Model | Rated Current Ratio (A) |
Accuracy Class |
Rated Output (VA) |
Thermal Stability Current (Ith) |
Dynamic Stability Current (Idyn) |
Rated Isolation Level (kV) |
|---|---|---|---|---|---|---|
| JLSZY-35 | 5~200/5 | 0.2S | 10 | 100 × I1n (1 s) | 2.5 × Ith | 42/95/195 |
| JLSZY-35 | 5~200/5 | 0.2 | 10 | 100 × I1n (1 s) | 2.5 × Ith | 42/95/195 |
Normes & Normative References
| Standard | Titre | Application |
|---|---|---|
| GB/T 20840.4-2015 | Transformateurs de mesure – Part 4: Transformateur combinés | Primary transformateur combiné requirements |
| GB/T 20840.1-2010 | Transformateurs de mesure – Partie 1: Exigences générales | Exigences générales for both PT and CT elements |
| GB/T 20840.2-2014 | Transformateurs de mesure – Partie 2: Exigences supplémentaires pour transformateurs de courant | CT element requirements |
| GB/T 20840.3-2013 | Transformateurs de mesure – Part 3: Exigences supplémentaires for Transformateurs de tension | PT element requirements |
| IEC 61869-1 | Transformateurs de mesure – Partie 1: Exigences générales | International reference standard |
| IEC 61869-2 | Transformateurs de mesure – Partie 2: Exigences supplémentaires pour transformateurs de courant | International CT reference |
| IEC 61869-3 | Transformateurs de mesure – Part 3: Exigences supplémentaires for Transformateurs de tension | International PT reference |
| IEC 60815 | Selection and Dimensioning of High-Voltage Insulators for Polluted Conditions | Pour extérieur pollution performance reference |
Conformité aux tests d’usine
- Tests de routine per applicable GB/IEC requirements including:
- PT and CT vérification de la polarité et du marquage des bornes
- Voltage ratio and current vérification du rapport
- Vérification de la précision at specified burdens and classes
- Dielectric withstand tests (power frequency and impulse)
- Inspection visuelle et dimensionnelle including marking clarity and workmanship conformity
- Test de décharge partielle where specified by project requirement
- Tests de type et spéciaux as required by project spécification (temperature rise, tenue au court-circuit, etc.)
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings supplied with each order.
- Le transformateur doit être securely mounted on a concrete foundation or steel platform using the designated fixing holes.
- Primary HV connections shall be made via pour extérieur connectors or bushings suitable for 35 kV service.
- Secondary terminal compartment shall be weather-sealed with appropriate cable glands for outgoing circuit secondaires.
- Dégagement adéquat shall be maintained for electrical safety, heat dissipation, and maintenance access per pour extérieur substation design normes.
- Lightning protection: Zinc oxide surge arrester shall be installed within 1 meter of the transformer as specified.
Contours
Notes de sécurité
- CT secondary handling: 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, short-circuit the CT secondary before disconnecting any instruments.
- PT secondary protection: PT circuit secondaires shall be protected by appropriate fuses rated for the burden and cable configuration.
- Grounding: Un point of each CT circuit secondaire and the PT secondary neutral shall be reliably grounded in accordance with GB/T 20840 and local electrical codes.
- Pour extérieur installation: Ensure proper sealing of all secondary terminal compartments to prevent moisture ingress.
- Lightning protection: Verify surge arrester installation and grounding système integrity before energization.
- Personnel safety: Toute installation and maintenance work shall comply with local electrical safety regulations and pour extérieur substation safety procedures.
Informations de commande
Lors de la commande, the required configuration shall be specified according to the grid requirements, normes applicables, and project technical spécification. The following parameters shall be clearly stated for technical confirmation and production release:
- Determine PT voltage ratio based on système nominal voltage (typically 35000/100 V for 35 kV systèmes).
- Determine CT primary current (Ip) based on feeder/load rating and expected operating range.
- Select PT and CT accuracy requirements (e.g., 0.2 or 0.2S for revenue mesurage; 0.5 for general measurement).
- Confirmer la charge assignée (VA) for PT and CT circuit secondaires based on connected devices and cable losses.
- Verify CT tenue au court-circuit capability (Ith/Idyn) against the système fault level.
- Specify conditions environnementales (altitude, temperature, pollution) if outside normal conditions de service.
Special configurations (non-standard ratios, additional accuracy noyaus, custom mounting, specific niveau d’isolements, or documentation requirements) shall be confirmed by technical agreement and final datasheet prior to production.