Overview
The LZZBJ9-10C2Q/180 is an indoor epoxy cast-resin current transformer designed for 12 kV, 11 kV, 13.8 kV and 15 kV medium-voltage systems. It features a fully enclosed, support-type structure with high-stability epoxy insulation, ensuring reliable electrical isolation between primary and secondary circuits.
This CT supports standard secondary currents of 5 A or 1 A and offers multiple accuracy classes including 0.2 and 0.5 for metering, and 5P, 5P20, 10P, 10P15, and 10P20 for protection applications. It is suitable for use in switchgear panels requiring compact installation, serving roles in energy metering, relay protection, feeder monitoring, and automation input circuits in accordance with IEC and project-specific standards.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 12 kV, 11 kV, 13.8 kV, 15 kV |
| Rated Insulation Level | 12/42/75 kV (reference) |
| Rated Frequency | 50 Hz (60 Hz on request) |
| Secondary Current | 5 A or 1 A |
| Primary Current Range | Up to 3150 A |
| Metering Accuracy | 0.2, 0.5 |
| Protection Accuracy | 5P, 5P20, 10P, 10P15, 10P20 |
| Structure Type | Support-type, indoor |
| Insulation Material | Epoxy cast-resin |
| Platform Width | 180 mm |
| Configuration Variants | C2/180, C2Q/180/3 |
| Application Scope | Measurement, metering, protection, automation |
Model Designation
- L: Current transformer
- Z: Indoor type / support structure
- Z: Epoxy resin casting insulation
- B: Protection level available
- J: Strengthened design
- 9: Design serial number
- 10: 10 kV catalogue class; applicable to 12 kV, 11 kV, 13.8 kV and 15 kV systems with confirmed insulation coordination
- C2: Standard C2 structure platform
- C2Q: Extended C2Q structure / technical selection variant
- 180: 180 nominal structure platform
- 3: Extended secondary technical table / configuration code
Construction
The LZZBJ9-10C2Q/180 current transformer employs a robust indoor, fully enclosed support-type construction. Its core and windings are encapsulated in high-quality epoxy cast-resin, providing excellent dielectric strength, mechanical stability, and resistance to environmental factors such as humidity and contamination. The primary conductor is integrated into the cast body, ensuring secure high-voltage isolation, while secondary terminals are accessible via a dedicated low-voltage compartment. The 180-platform design maintains consistent mounting dimensions across both C2/180 and C2Q/180/3 variants, facilitating interchangeability within the same switchgear layout. Separate terminal arrangements accommodate both lower and higher primary current ratings, up to 3150 A, without compromising insulation integrity or thermal performance.
Technical Parameters
Service Conditions
- Installation location: indoor medium-voltage switchgear
- System voltage: 12 kV, 11 kV, 13.8 kV and 15 kV systems
- Rated frequency: 50 Hz; 60 Hz by project confirmation
- Rated secondary current: 5 A or 1 A
- Ambient temperature: -5°C to +40°C
- Installation environment: The installation environment should be free from severe vibration, conductive dust, corrosive gas, explosive medium, heavy pollution and abnormal condensation.
- Insulation coordination requirement: For 13.8 kV and 15 kV systems, insulation coordination, creepage distance and project standard requirements must be confirmed before ordering.
Technical Parameters
The LZZBJ9-10C2Q/180 is an epoxy cast-resin current transformer designed for indoor use in 11 kV to 15 kV medium-voltage systems. It operates within an ambient temperature range of -5°C to +40°C, complies with GB 20840.2-2014 and IEC 61869-2:2012 standards, and supports primary current ratings from 10 A up to 3150 A depending on configuration. Surface creepage distance: 245 mm. Approximate weight: 36 kg.
| Rated primary current (A) |
Accuracy classed combination |
Rated Output (VA) |
Short-time thermal current (kA/1s) |
Rated dynamic current (kA) |
||
|---|---|---|---|---|---|---|
| 0.2S | 0.5S | 5P | ||||
| 10~75 | 0.2S/0.5S/5P | 10 | 15 | 15 | 65×I1n | 162.5×I1n |
| 100~400 | 0.2S/0.5S/5P | 10 | 15 | 15 | 80×I1n | 200×I1n |
| 500~1000 | 0.2S/0.5S/5P | 15 | 15 | 15 | 80×I1n | 200×I1n |
| 1250~1500 | 0.2S/0.5S/5P | 20 | 20 | 15 | 100 | 160 |
| 2000~3150 | 0.2S/0.5S/5P | 20 | 20 | 15 | 100 | 160 |
Installation & Wiring
Installation Diagram
The LZZBJ9-10C2Q/180 is installed as an indoor support-type current transformer with top-mounted primary terminals and secondary terminals located at the base. Mounting is achieved through a C2/180 or C2Q/180/3 platform using specified bolt holes. Primary busbars must align precisely with the terminal layout corresponding to the rated current range. Confirm final outline and terminal drawings before drilling mounting holes or fabricating busbars.
Selection & FAQs
Selection Guide
- Confirm system highest voltage first: the listed 12/42/75kV reference suits a 12kV equipment class, while 13.8kV/15kV projects require approved insulation coordination.
- Select C2/180 or C2Q/180/3 and a 5A–3150A ratio from load, metering range, fault duty and the required terminal platform.
- Define every secondary core—measurement, revenue metering, protection or automation—with its 1A/5A rating, class and terminal assignment.
- Calculate each circuit burden and verify the exact 10VA–150VA output, FS/ALF and thermal/dynamic ratings for the selected configuration.
- Approve low- or high-current busbar layout, 180-platform mounting, 245mm reference creepage where applicable, clearances and terminal access.
Frequently Asked Questions
Q1: Can this current transformer be applied in 13.8 kV systems?
Yes, subject to project confirmation. It supports 12 kV to 15 kV systems, but insulation coordination and creepage distance must be verified for 13.8 kV and 15 kV applications. Please confirm project standards before ordering.
Q2: Where should this current transformer be installed regarding environmental conditions?
The environment must be free from severe vibration, conductive dust, and corrosive gases. Ambient temperature should remain between -5°C and +40°C. Contact us for specific pollution degree requirements.
Q3: Which primary current ratings are available for this epoxy cast-resin CT?
Primary current ratings range from 10 A up to 3150 A depending on the configuration. Rated secondary current is available in 5 A or 1 A options. Specify your exact primary current during inquiry.
Q4: Are these medium-voltage current transformers compliant with international IEC standards?
Yes, they comply with IEC 61869-2:2012 and GB 20840.2-2014 standards. The epoxy cast-resin design ensures reliable indoor performance. Request the specific type test reports for your project.
Q5: How is the rated frequency handled for 60 Hz power systems?
60 Hz configurations are available by project confirmation, while the standard is 50 Hz. Please specify your system frequency and accuracy class combination when requesting a quote.
Q6: What type of current transformer is the LZZBJ9-10C2Q/180 model?
It is an indoor epoxy cast-resin current transformer designed for 11 kV to 15 kV medium-voltage switchgear. It features a 245 mm surface creepage distance and weighs approximately 36 kg.
Q7: Why choose this epoxy cast-resin design for medium-voltage switchgear?
The epoxy cast-resin design ensures reliable indoor performance and features a 245 mm surface creepage distance. It weighs approximately 36 kg for robust switchgear integration.