Overview
The JLSZV-10kV is a three-phase outdoor dry-type combined instrument transformer designed for 6 kV and 10 kV medium-voltage distribution systems. It features fully enclosed epoxy resin vacuum-cast insulation, providing high dielectric strength, moisture resistance, and long-term outdoor reliability without oil or maintenance.
Engineered for precision metering and system monitoring, it meets IEC 61869, GB/T 20840, and DL/T 866 standards. The unit delivers VT accuracy classes of 0.2 or 0.5 and configurable CT ratios, making it suitable for revenue-grade energy metering, grid modernization, industrial power monitoring, and renewable energy integration in polluted or exposed outdoor environments.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System voltage class | 6 kV / 10 kV |
| Rated frequency | 50 Hz (60 Hz optional) |
| VT connection | V/V (three single-phase units) |
| VT secondary voltage | 100 V |
| VT accuracy class | 0.2 / 0.5 |
| VT rated output | 2 × 15 VA (0.2) / 2 × 30 VA (0.5) |
| CT secondary current | 1 A, 2 A, or 5 A |
| Insulation level | 1.2/42/75 kV (power freq / lightning / switching) |
| Creepage distance | 440 mm |
| Insulation material | Epoxy resin cast (outdoor-grade) |
| Installation | Outdoor, pole or ground mounted |
| Applicable standards | IEC 61869-1/-2/-3; GB/T 20840; DL/T 866 |
Model Designation
- J: Combined instrument transformer (voltage + current)
- L: Current transformer component
- S: Three-phase configuration
- Z: Outdoor support (pillar/post) type mounting
- V: Voltage transformer with V/V connection
- 10: Voltage class (kV), for 6 kV and 10 kV systems
Construction
The JLSZV-10kV features a robust outdoor support (post) type structure suitable for pole or ground mounting. Its core components include laminated silicon-steel cores for the voltage transformers and toroidal magnetic cores for the current transformers, all fully encapsulated in vacuum-cast epoxy resin using an outdoor-grade formulation. This construction ensures void-free insulation with excellent mechanical strength, UV resistance, pollution resistance, and long-term dielectric stability under thermal cycling and harsh weather conditions. The design is maintenance-free, requiring only periodic external cleaning, and eliminates environmental risks associated with oil-filled alternatives. Terminal markings comply with IEC 61869 and GB/T 20840 polarity conventions for accurate metering and protection coordination.
Technical Parameters
Service Conditions
- Installation environment: Outdoor installation (pollution-resistant epoxy resin construction)
- Altitude: Not exceeding 1000 m above sea level (higher altitude ratings available upon specification for engineering confirmation)
- Ambient temperature: −25 °C to +45 °C (outdoor service range)
- Relative humidity: Daily average ≤ 95%, monthly average ≤ 90% (at +20 °C reference)
- Pollution level: Suitable for moderate to heavy pollution environments (creepage distance 440 mm minimum)
- Environmental conditions: Resistant to UV radiation, rain, snow, ice, and atmospheric pollution; no explosive or flammable atmosphere; designed for typical outdoor distribution system conditions
- Seismic conditions: Earthquake resistance per local grid requirements (shall be specified at ordering)
Technical Parameters
The JLSZV-10kV is a three-phase outdoor dry-type combined instrument transformer for 6–10 kV AC distribution systems (50 Hz), featuring cast-resin insulation, an operating temperature range of −25 °C to +45 °C, and suitability for altitudes up to 1000 m. It complies with standard medium-voltage instrument transformer requirements and supports primary current ranges from 5 A to 1000 A.
Voltage transformer Data
| Type | Voltage Ratio(V) |
Accuracy class / Rated secondaryoutput (VA) |
Limit output(VA) |
Rated insulationlevel(kV) |
|---|---|---|---|---|
| JLSZV(F)-6W | 6000/100 | 0.2—2×20 0.5—2×50 1.0—2×80 3.0—2×200 |
2×400 | 7.2/32/60 |
| JLSZV(F)-10W | 10000/100 | 0.2—2×20 0.5—2×50 1.0—2×80 3.0—2×200 |
2×400 | 12/42/75 |
Current transformer Data
| Rated primary current(A) |
Single ratio |
Accuracy class / Rated secondaryoutput (VA) |
1s thermal current(kA) |
Rated dynamic current(kA) |
||
|---|---|---|---|---|---|---|
| (0.2)S | 0.5S | 0.5 | ||||
| 7.5-10-15 | 7.5 | 1.0 | 2.5 | |||
| 10-15-20 | 10 | 1.5 | 3.75 | |||
| 15-20-30 | 15 | 2.4 | 6.0 | |||
| 20-30-40 | 20、25 | 10 | 10 | 15 | 3.0 | 7.5 |
| 30-40-50 | 30 | 10 | 10 | 15 | 4.5 | 11 |
| 40-50-75 | 40 | 10 | 10 | 15 | 8 | 20 |
| 50-75-100 | 50 | 10 | 10 | 15 | 9 | 22.5 |
| 75-100-150 | 75 | 10 | 10 | 15 | 12 | 30 |
| 100-150-200 | 100 | 10 | 10 | 15 | 16 | 40 |
Current transformer Data
| Rated primary current(A) |
Single ratio |
Accuracy class / Rated secondaryoutput (VA) |
1s thermal current(kA) |
Rated dynamic current(kA) |
||
|---|---|---|---|---|---|---|
| (0.2)S | 0.5S | 0.5 | ||||
| 150-200-300 | 150 | 10 | 10 | 15 | 24 | 60 |
| 200-300-400 | 200、250 | 10 | 10 | 15 | 32 | 80 |
| 300-400-500 | 300 | 10 | 10 | 15 | 45 | 100 |
| 400-500-600 | 400 | 10 | 10 | 15 | 60 | 100 |
Installation & Wiring
Outline Dimensions
The outline dimensions shown in the drawing define the overall envelope, mounting hole locations, and interface points for pole-mounted or ground-mounted installations. Exact dimensional data is provided in project-specific drawings issued by the engineering team.
Selection & FAQs
Selection Guide
- Specify system voltage (6 kV or 10 kV) and ensure compatibility with local grid requirements.
- Select VT accuracy class (0.2 or 0.5) and rated burden based on connected metering equipment.
- Define CT transformation ratio, secondary current (1 A, 2 A, or 5 A), accuracy class, and burden to match system load and metering needs.
- Confirm short-circuit withstand capabilities (Ith for 1 s and Idyn peak) according to network fault levels.
- Indicate environmental conditions such as pollution level, altitude above 1000 m, seismic requirements, and mounting type (pole- or ground-mounted).
- Request enhanced features like extended creepage distance, high-altitude derating, or special terminal arrangements if needed for site-specific conditions.
Frequently Asked Questions
Q1: Can this combined transformer be installed in heavy pollution areas?
Yes, it is suitable for moderate to heavy pollution environments. It features a minimum creepage distance of 440 mm and pollution-resistant epoxy resin construction. Confirm specific site conditions during ordering.
Q2: What is the maximum operating altitude for the JLSZV-10kV?
The standard rating supports altitudes up to 1000 meters above sea level. Higher altitude ratings are available upon engineering specification. Contact the factory for high-altitude project confirmation.
Q3: How does extreme cold affect the cast-resin insulation?
The cast-resin insulation maintains full performance in outdoor service ranges from −25 °C to +45 °C. It is also resistant to UV radiation, ice, and snow. Specify local seismic requirements at ordering.
Q4: Are seismic resistance specifications required before placing an order?
Yes, earthquake resistance must be specified according to local grid requirements at the time of ordering. Standard designs apply unless customized seismic parameters are provided. Please provide your project specifications.
Q5: Which primary current ranges are available for this combined unit?
The unit supports primary current ranges from 5 A to 1000 A for 6–10 kV AC distribution systems. Exact ratio and accuracy class depend on your specific metering needs. Contact us for detailed technical selection.
Q6: Where is this outdoor dry-type combined transformer typically applied?
It is designed for 6–10 kV AC, 50 Hz outdoor medium-voltage distribution systems. The combined instrument transformer integrates voltage and current measurement in a single cast-resin housing. Verify system frequency and voltage before procurement.