Overview
The JLSZY2-6/10 is an outdoor epoxy cast-resin combined instrument transformer designed for 6kV and 10kV three-phase AC distribution networks. It integrates both voltage transformer (VT) and current transformer (CT) elements into a single compact unit, featuring outdoor-rated epoxy cast-resin insulation for reliable performance in harsh environmental conditions.
This three-phase three-component transformer supports metering accuracy classes of 0.2/0.5 for VTs and 0.2S/0.2/0.5 for CTs, making it suitable for revenue-grade energy metering, power monitoring, and utility billing applications. It complies with standard requirements for 7.2kV and 12kV class systems and is commonly deployed at pole-mounted metering points, outdoor metering cabinets, compact substations, and the high-voltage side of distribution transformers.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 6kV / 10kV |
| Voltage Class | 7.2kV / 12kV |
| Frequency | 50Hz / 60Hz |
| VT Accuracy | 0.2 / 0.5 |
| CT Accuracy | 0.2S / 0.2 / 0.5 |
| CT Primary Current | 5A – 800A |
| CT Secondary Current | 5A or 1A |
| Insulation Type | Epoxy cast-resin |
| Installation Type | Outdoor pole-mounted or cabinet |
| Ambient Temperature | -15°C to +55°C |
| Max Altitude | 4500m |
| Insulation Level | 7.2/32/60kV or 12/40/75kV |
Construction
The JLSZY2-6/10 features a robust outdoor construction with epoxy cast-resin insulation encapsulating both the voltage and current transformer components. This solid, dry-type design eliminates the need for oil or gas insulation, ensuring maintenance-free operation and resistance to environmental factors such as moisture, dust, and UV exposure. The unit is built as a three-phase three-component assembly, with primary and secondary terminals sealed within weatherproof enclosures. Grounding provisions and secure mounting interfaces are integrated for safe and reliable installation on poles, in outdoor cabinets, or within compact substations.
Technical Parameters
Service Conditions
- Ambient temperature: -40°C to +40°C
- Altitude: Not exceeding 1000m above sea level
- Relative humidity: Average daily value not more than 95%, average monthly value not more than 90%
- Installation environment: Outdoor, non-enclosed location with natural ventilation
- Pollution degree: Class III (heavy pollution)
- Seismic intensity: Not exceeding 8 degrees
Technical Parameters
The JLSZY2-6/10 is an outdoor epoxy cast-resin combined instrument transformer rated for 7.2kV or 12kV system voltage classes. It features a cast-resin insulation system, operates within -40°C to +40°C ambient temperature, and is suitable for installations up to 1000m altitude. The device complies with IEC 61869 standards and supports primary current ratios from 5A to 800A with secondary outputs of 5A or 1A.
Voltage transformer Data
| Rated voltage ratio(V) |
Accuracy classes |
Rated output(VA) |
Rated insulationlevel(kV) |
|---|---|---|---|
| 6000/√3:100/√3:100/3 | 0.2 | 30 | 7.2/32/60 |
| 10000/√3:100/√3:100/3 | 0.5 | 40 | 12/40/75 |
| 11000/√3:110/√3:110/3 | 60 |
Current transformer Data
| Rated currentratio(A) |
Accuracy classes |
Rated output(vA) |
Rated short-time thermal current (Ith) |
Rated dynamic current (Idyn) |
Rated insulationlevel(kV) |
|---|---|---|---|---|---|
| 5~300/5 | 0.2S | 15 | 60I1n | 150I1n | 12/42/75 |
| 0.2 | 15 | ||||
| 0.5 | 20 |
Installation & Wiring
Installation Diagram
The JLSZY2-6/10 outdoor epoxy cast-resin combined instrument transformer is designed for pole or platform mounting. Ensure adequate clearance around the unit for safe operation and maintenance, following local electrical codes and the dimensional references provided.
Wiring Diagram
The wiring diagram illustrates a three-phase configuration combining both potential transformers (PT) and current transformers (CT) for metering applications. PT secondary terminals supply voltage signals to meters and monitoring equipment, while CT secondary terminals provide current inputs to active and reactive energy meters. Verify primary terminal sequence (AP, BP, CP) and secondary polarity prior to commissioning. All CT secondary circuits must remain closed during operation to prevent hazardous overvoltages. Grounding and connections to the meter box must comply with the approved project-specific wiring diagram.
Selection & FAQs
Selection Guide
- System voltage: Use JLSZY2-6 for 6kV systems and JLSZY2-10 for 10kV systems. For international applications, specify as 7.2kV or 12kV class combined instrument transformers.
- Installation position: Ideal for outdoor pole-mounted metering points, outdoor metering cabinets, or substation metering locations where a single integrated PT + CT unit is required.
- Current ratio: Select CT primary current based on actual load current (5A to 800A range). Choose 5A or 1A secondary current per meter requirements.
- Metering accuracy: Specify 0.2S CT accuracy for high-precision metering; 0.2 or 0.5 accuracy is acceptable if permitted by project specifications.
- Voltage ratio: Choose from standard ratios such as 6/√3 / 0.1/√3 / 0.1/3, 10/√3 / 0.1/√3 / 0.1/3, or 11/√3 / 0.11/√3 / 0.11/3 based on network voltage and meter input needs.
Frequently Asked Questions
Q1: Can this combined transformer be used on 12kV systems?
Yes, it is rated for 7.2kV and 12kV system voltage classes. The 12kV version provides a rated insulation level of 12/40/75kV. Please specify your exact system voltage during inquiry.
Q2: What are the outdoor installation requirements for this epoxy cast-resin transformer?
It requires an outdoor, non-enclosed location with natural ventilation. The device supports ambient temperatures from -40°C to +40°C and altitudes up to 1000m. Confirm site pollution degree is Class III or lower.
Q3: Which accuracy class is available for the voltage transformer section?
The voltage transformer section offers 0.2 and 0.5 accuracy classes depending on the ratio. For example, the 6000/√3 ratio provides class 0.2 with a 30VA rated output. Contact us to match your specific metering needs.
Q4: Does this combined instrument transformer comply with international IEC standards?
Yes, the JLSZY2-6/10 fully complies with IEC 61869 standards. It features a robust cast-resin insulation system suitable for heavy pollution environments. Request the factory test certificate with your order.
Q5: Can the primary current ratio be customized for our specific project?
The standard design supports primary current ratios ranging from 5A to 800A with 5A or 1A secondary outputs. Custom ratio configurations are subject to factory confirmation. Provide your exact primary requirements for a tailored quote.
Q6: What applications are suitable for this outdoor combined transformer?
This epoxy cast-resin combined transformer is ideal for outdoor power distribution and metering in medium voltage networks. It integrates both current and voltage transformation in a single weather-resistant unit.
Q7: How does this transformer perform in high seismic activity zones?
The JLSZY2-6/10 is designed to withstand seismic intensities not exceeding 8 degrees. Its epoxy cast-resin insulation ensures structural rigidity under mechanical stress. Verify local seismic conditions with our engineering team before installation.