Overview
The LZZBW-10/165/2S is an outdoor cast-resin current transformer designed for medium-voltage AC systems with a rated voltage up to 12kV. It features epoxy resin insulation, providing excellent dielectric strength and environmental resistance for reliable outdoor operation.
This transformer supports secondary currents of 5A or 1A and offers accuracy classes such as 0.2/10P, 0.25/10P, and 0.5/10P, making it suitable for both metering and protective applications. It complies with international standards IEC61869-2:2012 and Chinese standard GB20840.2-2014, ensuring performance consistency in outdoor distribution networks, switchgear installations, and relay protection systems.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Rated voltage | 10/11/12kV |
| Rated insulation level | 12/42/75kV |
| Rated frequency | 50Hz |
| Secondary current | 5A or 1A |
| Ambient temperature | -5°C to +55°C |
| Primary current range | 5–1000A |
| Accuracy combinations | 0.2/10P, 0.25/10P, 0.5/10P |
| Short-time thermal current | 45–60kA/1s |
| Dynamic current | 90–150kA |
| Insulation material | Epoxy resin |
Construction
The LZZBW-10/165/2S features a robust pillar-type design encapsulated entirely in outdoor-grade epoxy cast-resin. This construction provides superior mechanical strength, moisture resistance, and long-term insulation stability under harsh environmental conditions. The primary conductor passes axially through the center, while the secondary windings are embedded within the resin matrix, ensuring complete isolation between high-voltage and low-voltage circuits. Terminal blocks are integrated at the top for secure secondary connections, and the base includes mounting provisions for direct installation on support structures or switchgear frames.
Technical Parameters
Service Conditions
- Ambient Temperature: -40°C to +40°C
- Altitude: Not exceeding 1000 m above sea level
- Relative Humidity: Average daily value not more than 95%, average monthly value not more than 90%
- Installation Environment: Outdoor, non-enclosed, pollution severity class III
- Seismic Intensity: Not exceeding 8 degrees (0.2g)
- Wind Speed: Not exceeding 34 m/s
Technical Data
The LZZBW-10/165/2S is a 10 kV outdoor cast-resin pillar-type current transformer with epoxy insulation, designed for operation in ambient temperatures from -40°C to +40°C and altitudes up to 1000 m. It complies with IEC 61869 standards and supports primary current ratings up to 165 A with dual secondary windings.
| Rated
Primary |
Accuracy
Classes |
Rated Output (VA) | Rated Short-Time
Thermal |
Rated
Dynamic |
|||
|---|---|---|---|---|---|---|---|
| 0.2S | 0.2 / 0.5 | 5P | 10P | ||||
| 5–400 | 0.2/10P 0.2S/10P 0.5/10P |
10 | 10 | 15 | 15 | 60 I1n | 150 I1n |
| 600 | 50 I1n | 120 I1n | |||||
| 800 | 50 I1n | 100 I1n | |||||
| 1000 | 45 I1n | 90 I1n | |||||
Installation & Wiring
Installation Diagram
The LZZBW-10/165/2S outdoor cast-resin pillar-type current transformer is designed for vertical mounting on a support structure using the provided base flange and bolt pattern. Ensure proper alignment and secure fastening according to the dimensions shown in the diagram.
Selection & FAQs
Selection Guide
- Confirm the 10kV, 11kV, or 12kV system class and required 12/42/75kV insulation level.
- Select the primary ratio from the feeder load and protection study, then choose a 1A or 5A secondary to suit the connected devices and cable length.
- Specify each of the two secondary windings separately: metering accuracy and VA burden for one, protection class and VA burden for the other.
- Verify the selected ratio’s short-time thermal current and dynamic current against the network fault level.
- Confirm outdoor service conditions, vertical mounting dimensions, terminal access, electrical clearances, and grounding before ordering.
Frequently Asked Questions
Q1: Can this outdoor CT withstand extreme cold and high pollution environments?
Yes, it operates in -40°C to +40°C temperatures and pollution severity class III. Ensure installation altitude does not exceed 1000m. Contact us for high-altitude project verification.
Q2: Which accuracy class combination is best for protection and metering?
Select the 0.2S/10P or 0.5/10P combinations for dual secondary winding applications. This provides precise metering alongside reliable protection outputs per IEC 61869. Specify your exact burden during ordering.
Q3: What are the short-circuit thermal and dynamic current ratings?
The rated short-time thermal current is 60 times the primary rated current for 1 second. The rated dynamic current withstand is 150 times the primary current. Confirm specific primary ratings for exact kA values.
Q4: Are the IEC standard test certificates provided for this transformer?
Yes, the LZZBW-10/165/2S fully complies with IEC 61869 standards for current transformers. Type test and routine test certificates are available upon request. Ask your sales representative for the latest test reports.
Q5: How are custom primary current ratings handled for this model?
The standard manufacturing range covers primary currents from 5A to 400A. Customizations outside this range are subject to factory confirmation. Please provide your single-line diagram for technical evaluation.
Q6: Where is this pillar-type current transformer typically applied?
It is designed for outdoor, non-enclosed 10kV power systems as a pillar-type current transformer. The epoxy cast-resin insulation ensures reliable performance in harsh weather conditions. Contact our engineering team for system integration details.
Q7: Why is epoxy cast-resin used for this outdoor transformer?
Epoxy cast-resin insulation provides excellent weather resistance and mechanical strength for outdoor use. It withstands seismic intensities up to 8 degrees and wind speeds up to 34 m/s. Request the mechanical drawing for foundation design.