Overview
The LMZD2-10Q is an indoor epoxy cast-resin current transformer with a fully enclosed, hollow through-window design for cable or busbar passage. It is rated for 10kV, 11kV, and 12kV class medium-voltage AC systems operating at 50Hz, featuring a rated insulation level of 12/42/75kV.
This CT supports dual applications in metering and protection, offering accuracy combinations such as 0.2/5P, 0.5/5P, and 5P/5P. It is suitable for high-current feeder circuits, energy metering panels, and relay protection systems in indoor switchgear environments, complying with standard requirements for measurement accuracy and fault-current response.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Voltage class | 10kV, 11kV, 12kV |
| Rated insulation level | 12/42/75kV |
| Rated frequency | 50Hz |
| Rated primary current | 1200A to 5000A |
| Secondary current | 5A or 1A (standard) |
| Metering accuracy | 0.2, 0.5 |
| Protection accuracy | 5P |
| Accuracy combinations | 0.2/5P, 0.5/5P, 5P/5P |
| Insulation material | Epoxy cast-resin |
| Installation type | Wall-mounted, through-busbar/cable |
| Application | Indoor medium-voltage switchgear |
| Primary conductor | Cable, copper bar, or busbar (not wound) |
Model Designation
- L: Current transformer
- M: Bus type
- Z: Epoxy resin casting insulation
- D: Protection level / protection core configuration
- 2: Design number
- 10: Rated voltage class: 10kV
- Q: Reinforced type
Construction
The LMZD2-10Q features a fully enclosed indoor epoxy cast-resin body with a central hollow aperture for primary conductor passage. The robust resin casting provides excellent electrical insulation, mechanical strength, and resistance to indoor environmental conditions. The secondary winding is embedded within the resin structure and terminated at accessible terminals on the housing surface. A metal mounting plate enables secure through-wall installation in switchgear cabinets. The Q-type designation indicates a reinforced mechanical design optimized for high-current applications, ensuring long-term reliability under thermal and electromagnetic stress. The absence of a wound primary—relying instead on the external busbar or cable as the primary conductor—simplifies installation and enhances suitability for high-current circuits.
Technical Parameters
Service Conditions
- Installation location: indoor medium-voltage switchgear
- Rated voltage: 10kV, 11kV and 12kV class systems by project confirmation
- Rated frequency: 50Hz
- Ambient temperature: -5°C to +40°C
- Installation environment: should be free from severe vibration, corrosive gas, explosive medium, conductive dust, heavy pollution, and abnormal condensation.
- Special service conditions: for high altitude, coastal, humid, heavy-pollution, or special service conditions, technical confirmation is recommended before ordering.
Technical Parameters
The LMZD2-10Q is an epoxy cast-resin current transformer designed for indoor medium-voltage applications up to 12kV class. It operates within an ambient temperature range of -5°C to +40°C and complies with GB1208-2006 and IEC60044-1:2003 standards. The device supports rated primary currents from 1200A to 5000A and is suitable for standard or technically confirmed high-altitude and harsh-environment installations.
| Rated Primary Current (A) |
Accuracy Classes Combination |
Rated Secondary
Output (VA) |
Surface
Creepage |
||||
|---|---|---|---|---|---|---|---|
| 1S/2S | 0.2 | 0.5 | 5P10 | 5P15 | 5P20 | ||
| 1200 | 0.2/5P 0.5/5P 5P/5P |
20 | 30 | 60 | 40 | 30 | 255 mm |
| 1250 | |||||||
| 1500 | |||||||
| 1600 | |||||||
| 2000 | |||||||
| 3000 | 30 | 50 | 80 | 50 | 40 | ||
| 3150 | |||||||
| 4000 | |||||||
| 5000 | |||||||
Installation & Wiring
Installation Diagram
The LMZD2-10Q is installed through a wall opening in indoor switchgear, with the base plate secured using four mounting holes. The central aperture accommodates either a cable or busbar, sized according to the rated primary current. The secondary terminal block is accessible from the front of the cast-resin body for wiring.
Selection & FAQs
Selection Guide
- Select 1200A–5000A from continuous-current, temperature-rise and fault studies, then use the matching 135mm–230mm aperture and mounting dimensions.
- Choose 1A or 5A secondary and specify 0.2/0.5 metering plus 5P protection, or two independent 5P protection cores.
- Select 5P10, 5P15 or 5P20 from the relay study and verify the corresponding 20VA–80VA output.
- Obtain order-specific outputs for 4000A and 5000A because the catalogue table does not provide final VA values.
- Confirm 255mm creepage, wall opening, four-hole base plate, conductor support, terminal access, 12/42/75kV insulation and current standards.
Frequently Asked Questions
Q1: What applications suit this cast-resin current transformer?
The LMZD2-10Q is designed for indoor medium-voltage switchgear applications. It operates up to 12kV with epoxy cast-resin insulation. Contact our team for specific application confirmations.
Q2: Can this 10kV CT be installed in high-pollution areas?
Standard models require installation environments free from severe pollution. The cast-resin design operates optimally without corrosive gases or conductive dust. Request technical confirmation for heavy-pollution sites.
Q3: Which accuracy class combination is available for protection?
The LMZD2-10Q offers 5P10, 5P15, and 5P20 classes for protection circuits. Measurement cores include 0.2, 0.5, and 1S/2S options. Specify your exact VA output requirements during inquiry.
Q4: Are high primary current ratings available for this model?
Yes, the device supports primary currents ranging from 1200A to 5000A. This range accommodates various medium-voltage switchgear load requirements. Verify specific thermal and short-circuit limits with our engineering team.
Q5: Do these transformers meet IEC60044-1 international standards?
Yes, the LMZD2-10Q fully complies with IEC60044-1:2003 and GB1208-2006 standards. Factory test reports are provided upon shipment. Request specific certification documents during your procurement process.
Q6: Is high-altitude customization available for this transformer model?
Yes, high-altitude and special service conditions require technical confirmation prior to purchase. Our engineering team will adjust the design parameters accordingly. Contact sales for customized project solutions.
Q7: Where should this wall-mounted current transformer be installed?
This is strictly an indoor, wall-mounted medium-voltage current transformer. It features cast-resin insulation optimized for indoor switchgear cubicles. Confirm your project requirements exclude outdoor applications.