Product Overview
The JLSZV-35 combined transformer is an indoor epoxy resin cast three-phase two-component measurement device designed for 35kV medium-voltage distribution systems. This CT PT combined transformer integrates voltage transformer (PT) and current transformer (CT) functions in a single epoxy cast-resin assembly, providing accurate current and voltage signals for energy metering and protection applications.
As a 35kV combined transformer with 40.5kV class insulation, the JLSZV-35 is suitable for indoor switchgear, compact substations, and industrial distribution systems requiring high-accuracy metering. The epoxy cast-resin metering transformer design ensures excellent insulation performance, moisture resistance, and long-term reliability in demanding indoor environments.
Product Display
[Product images to be added]
Application Position
The JLSZV-35 is installed indoors in switchgear compartments, metering cabinets, or compact substations. The primary terminals connect to the three-phase 35kV circuit, while the secondary terminal box supplies voltage and current signals to energy meters, protection relays, and monitoring instruments. The indoor epoxy resin transformer design provides superior insulation performance without requiring additional environmental protection.
Main Applications
- 35kV indoor switchgear metering applications using JLSZV-35 combined transformer
- Compact substations requiring integrated CT PT measurement
- Industrial distribution systems with 35kV incoming supply
- High-accuracy revenue metering for utility billing with 0.2S accuracy class
- Protection relay applications requiring precise current signals
- Indoor metering cabinets with space constraints
- Projects requiring GB20840.4-2015 and IEC 61869.4 compliance
Application Case Studies
Application Scenario 1: Indoor Switchgear Metering
Utilities deploy the JLSZV-35 combined transformer in 35kV indoor switchgear for revenue billing and load monitoring. The compact three-phase two-component design integrates CT and PT functions in one unit, reducing installation space and wiring complexity. The epoxy cast-resin insulation ensures reliable performance in indoor environments with controlled temperature and humidity. This indoor metering transformer 35kV solution provides accurate measurement for utility billing applications.
Application Scenario 2: Industrial High-Voltage Metering
Industrial facilities with 35kV incoming supply require accurate energy measurement for cost allocation and load monitoring. The JLSZV-35 combined transformer supports wide current range from 5A to 1200A, accommodating various load conditions. The 0.2S accuracy class provides high-precision metering for billing applications, while the epoxy resin construction ensures long-term stability without maintenance. This CT PT combined transformer 35kV delivers reliable performance for industrial metering needs.
Application Fit
Suitable For
- Indoor 35kV metering points requiring integrated CT and PT signals
- Switchgear compartments with space constraints
- Compact substations requiring high-accuracy metering
- Industrial facilities with 35kV incoming supply
- Applications requiring wide current range from 5A to 1200A
- Projects requiring GB20840.4-2015 and IEC 61869.4 compliance
- Indoor environments with controlled temperature and humidity
Not Recommended For
- Outdoor installation applications requiring weather protection
- Pole-mounted or elevated installation applications
- Applications requiring separate CT and PT bodies
- Protection-only applications where metering accuracy is not required
- Environments with extreme temperature variations beyond -25°C to +55°C
Installation Conditions
- Installation position: Indoor switchgear, metering cabinets, or compact substations
- Ambient temperature: -25°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Environment: Indoor with controlled temperature and humidity
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Epoxy resin construction requires minimal maintenance in indoor environments
Technical Parameters
The JLSZV-35 is an indoor epoxy cast-resin combined transformer for 35kV systems with three-phase two-component design. Operating temperature -25°C to +55°C, altitude up to 4500m, compliant with GB20840.4-2015 and IEC 61869.4:2013. Features 40.5kV class insulation and wide current range from 5A to 1200A.
Voltage Transformer Data
| Rated Voltage Ratio (kV) |
Rated Insulation Level (kV) |
Accuracy Class / Rated Output |
Max Output |
|---|---|---|---|
| 35/0.1 | 40.5/95/200 | 0.2 (2×30VA), 0.5 (2×60VA) | 600 VA |
| 33/0.1 | 40.5/95/200 | 0.2 (2×30VA), 0.5 (2×60VA) | 600 VA |
Current Transformer Data
| Rated Primary Current (A) |
Rated Insulation Level (kV) |
Accuracy Class / Rated Output |
1s Thermal Current |
Dynamic Current |
|---|---|---|---|---|
| 5 – 600 | 40.5/95/185 | 0.2S (2×15VA) | 80 × In | 200 × In |
| 750 – 800 | 40.5/95/185 | 0.2S (2×15VA) | 80 kA | 200 kA |
| 1000 – 1200 | 40.5/95/185 | 0.2S (2×20VA) | 100 kA | 250 kA |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Side View | Length 1523±3mm; Width 636±5mm; Height 815±5mm | Four bushings with terminals |
| End View | Width 840mm | Depth profile with mounting base |
| Top View | Length 1400±2mm; Width 1060±2mm | Terminal layout: AP1, AP2, CP1, CP2 |
Wiring Diagram
[Wiring diagram to be added]
Installation Guidelines
- Confirm AP1/AP2 and CP1/CP2 terminal sequence before commissioning
- CT secondary circuits must not be open-circuited during operation
- PT secondary terminals provide voltage input to meters and protection relays
- CT secondary terminals provide current input to energy meters and protection devices
- Grounding and wiring should follow the approved project wiring diagram
- Ensure adequate ventilation in indoor installation environment
Standards Compliance
The JLSZV-35 combined transformer complies with GB20840.4-2015 and IEC 61869.4:2013 for combined instrument transformers. For international projects, compliance should be aligned with applicable IEC instrument transformer standards and local utility metering rules.
Selection Guide
Select by system voltage: Use JLSZV-35 for 35kV systems (40.5kV class insulation).
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 1200A primary current range in three segments.
Select by metering accuracy: Use 0.2S CT accuracy for high-accuracy energy metering. PT accuracy classes include 0.2 and 0.5.
Select by voltage ratio: Choose 35/0.1kV or 33/0.1kV according to network voltage and meter input requirement.
Ordering Information
When ordering the JLSZV-35 combined transformer, please specify:
- Model: JLSZV-35
- System voltage: 35kV or 33kV
- PT ratio: 35/0.1kV or 33/0.1kV
- CT primary current: 5A to 1200A (specify exact value)
- CT secondary current: 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2 or 0.5
- Installation type: Indoor
- Quantity