Overview
The JLSZV-6/10W is an outdoor epoxy cast-resin combined transformer designed for 6kV and 10kV three-phase medium-voltage distribution systems. It integrates both current transformer (CT) and voltage transformer (PT) functions into a single cast-resin insulated unit housed in a robust iron enclosure, ensuring reliable performance in standard outdoor environments.
This CT PT combined transformer delivers high-accuracy metering compliant with GB17201-2006 standards, supporting current ranges from 5A to 200A. It is ideal for pole-mounted installations, compact substations, and industrial facilities requiring precise energy measurement for billing and protection applications in 6kV or 10kV networks.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 6kV / 10kV |
| Voltage Class Options | 3.6/25/40kV, 7.2/32/60kV, 12/42/75kV |
| Primary Current Range | 5A – 200A |
| Secondary Current | 5A |
| Secondary Voltage | 100V / √3 |
| Accuracy Class (Metering) | 0.2 / 0.5 |
| Accuracy Class (Protection) | 3P / 6P |
| Insulation Material | Epoxy cast-resin |
| Enclosure Material | Iron |
| Installation Type | Outdoor, pole-mounted or substation |
| Compliance Standard | GB17201-2006 |
| Phase Configuration | Three-phase |
Model Designation
- J: Combined instrument transformer (CT + PT)
- L: Outdoor type
- S: Three-phase
- Z: Cast-resin insulated
- V: Voltage transformer included
- 6/10: Rated for 6kV and 10kV systems
- W: With iron enclosure
Construction
The JLSZV-6/10W features a monolithic epoxy cast-resin construction that encapsulates both the current and voltage transformer cores and windings, providing excellent dielectric strength and environmental resistance. The entire assembly is housed within a grounded iron enclosure, offering mechanical protection against impact, weather, and tampering in standard outdoor conditions. Primary terminals are designed for direct connection to 6kV or 10kV overhead lines, while the secondary terminal box—integrated into the enclosure—provides secure and insulated connections for metering and protection circuits. The design eliminates the need for separate CT and PT units, reducing installation footprint and wiring complexity. All materials comply with GB17201-2006 requirements for outdoor metering accuracy and durability.
Technical Parameters
Service Conditions
- Installation position: Outdoor pole-mounted, substation, or distribution points
- Ambient temperature: -15°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Enclosure: Iron enclosure with protective coating
- Insulation: Epoxy cast-resin internal insulation
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Iron enclosure requires periodic inspection for coating integrity
Technical Parameters
The JLSZV-6/10W is a three-phase outdoor combined instrument transformer designed for 6kV and 10kV systems. It features epoxy cast-resin internal insulation, operates within an ambient temperature range of -15°C to +55°C, and is suitable for installations up to 4500m altitude without derating. The unit complies with GB17201-2006 and supports primary current ratios from 5A to 200A.
Voltage Transformer Data
| Rated Voltage Ratio |
Accuracy Class |
Rated Output (VA) |
Limit Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| 3000/100 | 0.2 | 15 | 300 | 3.6/25/40 |
| 6000/100 | 0.5 | 30 | 7.2/32/60 | |
| 10000/100 | 0.5 | 30 | 12/42/75 |
Current Transformer Data
| Rated Current Ratio (A) |
Accuracy Class |
Rated Output (VA) |
Short-Time Thermal Current |
Dynamic Current |
Rated Insulation Level (kV) |
|---|---|---|---|---|---|
| 5 – 200/5 | 0.2S | 7.5 | 80 × I1n | 200 × I1n | 12/42/75 |
| 5 – 200/5 | 0.2 | 10 | 80 × I1n | 200 × I1n | 12/42/75 |
Installation & Wiring
Installation Diagram
The JLSZV-6/10W outdoor epoxy cast-resin combined transformer is designed for pole or platform mounting. Ensure the mounting structure can support the unit’s weight and dimensions. Align the base with the mounting layout shown in the top view (length 628mm; width 310/360mm) and secure using appropriate hardware. Maintain clearances as per local electrical codes.
Wiring Diagram
Wiring connections must follow the approved project diagram. The PT secondary terminals provide voltage input to meters and monitoring devices, while the CT secondary terminals supply current input to active and reactive energy meters. Confirm the terminal sequence for AP1/AP2 and CP1/CP2 before commissioning. The meter box includes five terminals for external connections, and the integrated watt-hour meter compartment (440mm wide, 435mm high) houses the metering equipment.
Selection & FAQs
Selection Guide
- Select the 6kV or 10kV system class and corresponding insulation and PT ratio.
- Choose the 5A–200A CT ratio, accuracy class, and 5A secondary to match the load profile.
- Calculate the CT and PT burdens of meters, terminals, and secondary wiring.
- Confirm altitude, temperature, pollution, outdoor enclosure coating, grounding, and surge protection.
- Verify base dimensions, conductor clearances, terminal sequence, meter compartment, and approved wiring diagram.
Frequently Asked Questions
Q1: How is the JLSZV-6/10W combined transformer installed outdoors?
It is designed for pole-mounted, substation, or distribution point installations. The iron enclosure requires periodic coating inspection, and the grounding terminal must connect per local electrical codes. Contact us for specific mounting brackets.
Q2: What is the maximum installation altitude without derating?
The unit operates up to 4500m altitude without requiring any capacity derating. It maintains full performance within an ambient temperature range of -15°C to +55°C. Specify your exact site altitude during inquiry.
Q3: Which accuracy class does the voltage transformer provide?
The voltage transformer offers a 0.2 accuracy class with a 15VA rated output. This ensures precise metering for 6kV and 10kV systems according to GB17201-2006 standards. Factory calibration certificates are available upon request.
Q4: What internal insulation material is used in this transformer?
It features epoxy cast-resin internal insulation for high reliability. The rated insulation level is 3.6/25/40 kV, suitable for 6kV and 10kV outdoor applications. Request the full type test report for detailed dielectric specifications.
Q5: Can the primary current ratio be customized for our project?
Yes, the combined transformer supports primary current ratios ranging from 5A to 200A. Standard voltage ratios include 3000/100V and 6000/100V. Please provide your exact ratio requirements for factory confirmation.
Q6: What routine tests are performed before shipment?
Standard routine tests include ratio, polarity, and insulation resistance checks per GB17201-2006. Specific type tests or third-party certifications are subject to confirmation. Contact our sales team for detailed test protocols.
Q7: Where is this outdoor combined instrument transformer typically applied?
It is primarily used in 6kV and 10kV outdoor power distribution networks and substations. The unit integrates both current and voltage transformation for metering and protection. Consult our engineers for specific grid application suitability.