Product Overview
The JLSZV-24W combined transformer is an outdoor epoxy resin cast three-phase two-component measurement device designed for 24kV 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 24kV combined transformer with 24/65/125kV class insulation, the JLSZV-24W is suitable for outdoor substations, industrial distribution systems, and power networks requiring high-accuracy metering. The epoxy cast-resin metering transformer design eliminates oil-leaking issues common in older oil-immersed models, making it environmentally friendly and maintenance-free.
This outdoor epoxy resin transformer features tamper-resistant design to prevent electricity theft, high precision classes (0.2S, 0.2, 0.5) for accurate billing, and robust construction to withstand harsh outdoor conditions with high creepage distances and excellent lightning impulse withstand levels.
Product Display
[Product images to be added]
Application Position
The JLSZV-24W is installed outdoors in substations, on poles, or at distribution points. The primary terminals connect to the three-phase 24kV circuit, while the secondary terminal box supplies voltage and current signals to energy meters, protection relays, and monitoring instruments. The outdoor metering transformer 24kV design provides superior insulation performance and weather resistance for long-term outdoor operation.
Main Applications
- 24kV outdoor distribution networks requiring integrated CT PT measurement
- Industrial substations with 24kV incoming supply
- Power distribution networks requiring high-accuracy metering
- Outdoor pole-mounted metering applications
- Active and reactive energy measurement for utility billing
- Protection relay applications requiring precise current signals
- Projects requiring GB20840.4-2015 and IEC 61869.4 compliance
Application Case Studies
Application Scenario 1: Industrial Substation Metering
Industrial facilities with 24kV incoming supply deploy the JLSZV-24W combined transformer 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 outdoor environments with temperature variations and humidity exposure.
Application Scenario 2: Power Distribution Network Metering
Utilities deploy the JLSZV-24W at 24kV distribution points for accurate energy measurement and system monitoring. The tamper-resistant design prevents electricity theft, while the high precision classes ensure accurate billing data. The wide current range from 5A to 2000A accommodates various load conditions without requiring multiple metering units.
Application Fit
Suitable For
- Outdoor 24kV metering points requiring integrated CT and PT signals
- Industrial substations with 24kV incoming supply
- Power distribution networks requiring high-accuracy metering
- Outdoor pole-mounted metering applications
- Applications requiring wide current range from 5A to 2000A
- Projects requiring tamper-resistant metering solutions
- Environments requiring maintenance-free operation
Not Recommended For
- Indoor-only compact switchgear applications
- Applications requiring separate CT and PT bodies
- Protection-only applications where metering accuracy is not required
- Environments with altitude exceeding 2000m
- Applications with extreme temperature variations beyond -25°C to +55°C
Installation Conditions
- Installation position: Outdoor substations, pole-mounted, or distribution points
- Ambient temperature: -25°C to +55°C
- Maximum altitude: ≤ 2000m
- Environment: Outdoor with weather exposure
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Epoxy resin construction requires minimal maintenance in outdoor environments
Technical Parameters
The JLSZV-24W is an outdoor epoxy cast-resin combined transformer for 24kV systems with three-phase two-component design. Operating temperature -25°C to +55°C, altitude up to 2000m, compliant with GB20840.4-2015 and IEC 61869.4:2013. Features tamper-resistant design, wide current range from 5A to 2000A, and maintenance-free operation.
Voltage Transformer Data
| Rated Voltage Ratio (kV) |
Rated Insulation Level (kV) |
Accuracy Class / Rated Output |
Max Output |
|---|---|---|---|
| 20/0.1 | 24/65/125 | 0.2 (2×30VA), 0.5 (2×100VA) | 600 VA |
Current Transformer Data
| Rated Primary Current (A) |
Rated Insulation Level (kV) |
Accuracy Class / Rated Output |
1s Thermal Current |
Dynamic Current |
|---|---|---|---|---|
| 5 – 600 | 24/65/125 | 0.2S (2×30VA) | 80 × In | 200 × In |
| 750 – 800 | 24/65/125 | 0.2S (2×40VA) | 80 kA | 200 kA |
| 1000 – 2000 | 24/65/125 | 0.2S (2×40VA) | 100 kA | 250 kA |
Installation & Dimensions
Dimension Reference
| View | Key Dimensions |
Application Note |
|---|---|---|
| Front View | Width 977±5mm; Spacing 381mm | Four bushings: AP1, AP2, CP1, CP2 |
| Side View | Height 669+15mm; Depth 550+5mm | Profile with mounting base |
| Top View | Width 915mm | Terminal layout with nameplate |
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 proper outdoor installation with adequate clearance
Standards Compliance
The JLSZV-24W 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-24W for 24kV systems (24/65/125kV insulation level).
Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 2000A 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 20/0.1kV according to network voltage and meter input requirement.
Ordering Information
When ordering the JLSZV-24W combined transformer, please specify:
- Model: JLSZV-24W
- System voltage: 24kV
- PT ratio: 20/0.1kV
- CT primary current: 5A to 2000A (specify exact value)
- CT secondary current: 5A
- CT accuracy class: 0.2S
- PT accuracy class: 0.2 or 0.5
- Installation type: Outdoor
- Quantity
FAQs