Overview
The LDJLSZV-10 is a floor-standing combined transformer metering box designed for 10kV outdoor medium-voltage distribution systems. It features a robust metal enclosure that integrates both current transformer (CT) and voltage transformer (PT/VT) functions in a single unit, providing accurate current and voltage signals for high-voltage energy metering applications.
This product supports active and reactive energy measurement with a wide current range from 7.5A to 600A and complies with State Grid standard GB17201-2006. It is suitable for ground-level installations in substation yards, industrial facilities, and outdoor distribution points requiring enhanced mechanical protection against environmental factors and unauthorized access.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 10kV |
| Frequency | 50Hz |
| Current Range | 7.5A – 600A |
| Accuracy Class (CT) | 0.2S / 0.5S |
| Accuracy Class (PT) | 0.2 / 0.5 |
| Insulation Level | 12kV |
| Rated Short-Time Current | 16kA/4s |
| Secondary Voltage (PT) | 100V / √3 |
| Secondary Current (CT) | 5A or 1A |
| Protection Class | IP54 |
| Standards Compliance | GB17201-2006 |
| Installation Type | Floor-standing, outdoor |
Construction
The LDJLSZV-10 features a fully enclosed, floor-standing metal cabinet constructed from corrosion-resistant steel with an IP54 protection rating. The internal current and voltage transformers are cast-resin insulated, ensuring reliable performance in outdoor environments with exposure to moisture, dust, and temperature variations. The cabinet includes double doors with lockable handles for secure access to the secondary terminal compartment, which houses terminals for connecting energy meters and monitoring instruments. All primary conductors are rated for 10kV operation and are isolated within the cast-resin bodies to prevent flashover and ensure long-term dielectric stability. The design provides robust mechanical protection while maintaining compliance with GB17201-2006 for high-voltage metering accuracy and safety.
Technical Parameters
Service Conditions
- Installation position: Ground-level installation in substation yards, industrial facilities, or distribution points
- Ambient temperature: -15°C to +55°C
- Maximum altitude: ≤ 4500m (no derating required)
- Cabinet protection: Metal enclosure provides weather and mechanical protection
- Grounding: Connect grounding terminal per local electrical codes and metering standards
- Maintenance: Double-door design allows easy access for inspection and maintenance
Technical Parameters
The LDJLSZV-10 is a floor-standing combined transformer metering box designed for 10kV outdoor applications. It features a metal cabinet with cast-resin insulation, operates within an ambient temperature range of -15°C to +55°C, and is rated for altitudes up to 4500m without derating. The unit complies with GB17201-2006 and supports a wide primary current range from 7.5A to 600A.
Voltage Transformer Data
| Model | Rated Voltage Ratio |
Accuracy Class / Rated Output |
Limit Output |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| LDJLSZV-6 | 6000/100 | 0.2 (2×20VA), 0.5 (2×50VA), 1.0 (2×80VA), 3.0 (2×200VA) | 2×400 VA | 7.2/32/60 |
| LDJLSZV-10 | 10000/100 | 0.2 (2×20VA), 0.5 (2×50VA), 1.0 (2×80VA), 3.0 (2×200VA) | 2×400 VA | 12/42/75 |
Current Transformer Data
| Rated Primary Current (A) |
Accuracy Class / Rated Output |
Short-Time Thermal Current |
Dynamic Current |
|---|---|---|---|
| 7.5 – 15 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 1.0 | 2.5 |
| 20 – 50 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 2.5 | 6.3 |
| 75 – 100 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 6.3 | 16 |
| 150 – 200 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 16 | 40 |
| 300 – 400 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 40 | 100 |
| 500 – 600 | 0.2S (10VA), 0.5S (10VA), 0.5 (15VA) | 60 | 150 |
Installation & Wiring
Installation Diagram
The LDJLSZV-10 floor-standing combined transformer metering box is installed on a level, stable foundation with adequate clearance for ventilation and maintenance access. The unit features a double-door front design, side-mounted internal components, and rear ventilation grilles with a lifting hook for handling. Ensure the base dimensions accommodate the tapered profile (1240mm at top to 1100mm at bottom) during foundation preparation.
Wiring Diagram
The wiring configuration includes primary terminals AP1/AP2, BP1/BP2, and CP1/CP2 for high-voltage connections. Current transformers (CTs) provide secondary current outputs to active and reactive energy meters, while potential transformers (PTs) supply secondary voltage signals to meters and monitoring devices. All CT secondary circuits must remain closed during operation to prevent hazardous overvoltages. Grounding of the metal cabinet and all internal wiring must strictly follow the approved project wiring diagram.
Selection & FAQs
Selection Guide
- Select LDJLSZV-10 for 10kV systems (12kV insulation class) or LDJLSZV-6 for 6kV systems (7.2kV class).
- Choose CT primary current between 7.5A and 600A based on actual load requirements.
- Specify CT accuracy class as 0.2S for high-precision revenue metering, or 0.5S/0.5 per project specifications.
- Select PT voltage ratio as 10000/100 for 10kV networks or 6000/100 for 6kV networks to match meter input needs.
- Confirm PT accuracy class: 0.2, 0.5, 1.0, or 3.0, depending on metering and protection requirements.
Frequently Asked Questions
Q1: How is this 10kV combined transformer installed outdoors?
It requires ground-level installation in substations or distribution points. The metal enclosure provides weather protection, operating from -15°C to +55°C. Ensure proper grounding per local electrical codes.
Q2: Which accuracy classes are available for the voltage transformer?
Available classes include 0.2, 0.5, 1.0, and 3.0 with respective rated outputs up to 200VA. Specify your exact metering requirements for factory configuration.
Q3: Can this floor-standing metering box operate at high altitudes?
Yes, it operates at maximum altitudes up to 4500m without requiring any capacity derating. Confirm specific site conditions with our engineering team prior to ordering.
Q4: What primary current ranges can be customized for this unit?
The unit supports a wide primary current range from 7.5A to 600A. Contact our sales team with your specific ratio requirements for a custom quotation.
Q5: Are there specific technical standards this 10kV metering box complies with?
The LDJLSZV-10 complies with the GB17201-2006 standard for 10kV combined transformers. For international certifications like IEC, please contact us for project-specific compliance documentation.
Q6: Why choose this cast-resin combined transformer for outdoor applications?
It is designed for 10kV outdoor revenue metering and protection in industrial facilities. The cast-resin insulation ensures reliable performance in harsh environments.