Overview
The JDZ10-3/6/10A/160 (RZL10) is an indoor epoxy cast-resin voltage transformer designed for medium-voltage switchgear applications in 50Hz or 60Hz AC systems. It accurately converts line voltage from 3kV, 6kV, or 10kV down to standardized secondary outputs such as 0.1kV, dual 0.1/0.1kV, or 0.22kV for use in metering, monitoring, protection, and auxiliary circuits.
This compact RZL10-style unit features a 160mm structure with reduced weight and cabinet footprint compared to larger variants. It is ideal for projects requiring space-efficient line-voltage transformation without compromising performance or reliability in indoor environments.
Key Ratings Snapshot
| Parameter | Value |
|---|---|
| System Voltage | 3kV / 6kV / 10kV |
| Insulation Class | 3.6kV / 7.2kV / 12kV |
| Frequency | 50Hz / 60Hz |
| Voltage Ratios | 3/0.1kV, 6/0.1kV, 10/0.1kV; 3/0.1/0.1kV; 6/0.22kV; 10/0.22kV |
| Max Output | 400VA (single sec), 350VA (dual/aux) |
| Accuracy Classes | 0.2, 0.5, 1.0, 3.0 |
| Ambient Temp | -25 deg C to +40 deg C |
| Installation Type | Indoor switchgear |
| Insulation | Epoxy cast-resin |
| Weight | 21.76kg |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- 10: Design series code
- 3 / 6 / 10: Rated system voltage (kV)
- A: Compact configuration
- 160: RZL10-style outline size
Construction
The JDZ10-3/6/10A/160 series features a monolithic epoxy cast-resin body that fully encapsulates primary and secondary windings, providing excellent mechanical strength, moisture resistance, and long-term dielectric stability. The compact design is optimized for line-voltage applications, supporting secondary outputs of 0.1kV for metering, 0.1/0.1kV for dual isolated circuits, and 0.22kV for cabinet auxiliary power.
All terminals are accessible via a front-mounted terminal box, and the base conforms to the RZL10 standard for seamless integration into compact indoor switchgear. The unit is not intended for phase-to-ground or residual-voltage applications, which require grounded-type (e.g., JDZX) transformers.
Technical Parameters
Service Conditions
- Installation Location: Indoor air-insulated switchgear or protected cabinet
- Ambient Temperature: -25 deg C to +40 deg C
- System Frequency: 50Hz / 60Hz
- Relative Humidity: <=95% (non-condensing)
- Altitude: <=1000m above sea level
Technical Data
| Model | Rated Voltage Ratio |
Accuracy Class / Rated Output |
Max. Output |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZ10-3A/160 | 3 / 0.1kV | 0.2:20VA 0.5:50VA 1.0:100VA 3.0:200VA |
400VA | 3.6/25/40 |
| JDZ10-6A/160 | 6 / 0.1kV | 0.2:20VA 0.5:50VA 1.0:100VA 3.0:200VA |
400VA | 7.2/30/60 |
| JDZ10-10A/160 | 10 / 0.1kV | 0.2:20VA 0.5:50VA 1.0:100VA 3.0:200VA |
400VA | 12/42/75 |
| JDZ10-3A/160 | 3 / 0.1 / 0.1kV | 0.2/0.2:10/10VA 0.2/0.5:10/10VA |
350VA | 3.6/25/40 |
| JDZ10-6A/160 | 6 / 0.1 / 0.1kV | 0.2/0.2:10/10VA 0.2/0.5:10/10VA |
350VA | 7.2/30/60 |
| JDZ10-10A/160 | 10 / 0.1 / 0.1kV | 0.2/0.2:10/10VA 0.2/0.5:10/10VA |
350VA | 12/42/75 |
| JDZ10-3A/160 | 3 / 0.22kV | 3.0:80VA | 350VA | 3.6/25/40 |
| JDZ10-6A/160 | 6 / 0.22kV | 3.0:80VA | 350VA | 7.2/30/60 |
| JDZ10-10A/160 | 10 / 0.22kV | 3.0:80VA | 350VA | 12/42/75 |
Installation & Wiring
Installation Diagram
The transformer mounts directly onto the base plate of indoor switchgear using standard M8 bolts. Primary terminals (A and B) connect across phases for line-voltage measurement. Secondary wiring connects to the front terminal box, labeled according to configuration (e.g., a/b, 1a/1b, or auxiliary terminals). Ensure adequate phase-to-phase clearance and grounding before energizing.
Outline Dimensions
| Item | Reference Value |
|---|---|
| Overall base length | 330 +/-2mm |
| Main mounting length | 300 +/-2mm |
| Body mounting length | 270 +/-1.5mm |
| Base width | 160 +/-1mm |
| Overall height | 230 +/-2mm |
| Body height reference | 216mm |
| Top terminal spacing | 102mm reference |
| Primary terminal bolt | 2-M8 reference |
| Grounding bolt | M8 reference |
| Approximate weight | 21.76kg |
Selection & FAQs
Selection Guide
- Select JDZ10-3A/160, -6A/160, or -10A/160 based on 3kV, 6kV, or 10kV system voltage (use 3.6kV/7.2kV/12kV class terms for international projects).
- Choose the 160 structure when cabinet space is limitedâit is more compact and lighter (~21.76kg) than 180mm alternatives.
- Use 0.1kV secondary for standard metering and monitoring; 0.1/0.1kV for two independent secondary circuits.
- Select 0.22kV output only for auxiliary cabinet power needsâconfirm load and burden during specification.
- Maximum output is 400VA for single-secondary models and 350VA for dual or auxiliary configurations.
Frequently Asked Questions
Q1: Can this voltage transformer be installed outdoors?
No, it is strictly designed for indoor installation. It must be used in air-insulated switchgear or protected cabinets with relative humidity <=95%. Contact us for outdoor epoxy cast resin alternatives.
Q2: Which accuracy class is suitable for protective relaying?
The 3.0 accuracy class is recommended for protection applications. It provides up to 200VA rated output for the 10kV models. Specify your exact burden requirements during ordering.
Q3: What is the maximum operating altitude for this transformer?
The maximum installation altitude is 1000 meters above sea level. For higher altitudes, dielectric strength and cooling conditions must be derated. Please confirm your site elevation with our engineering team.
Q4: Which factory tests are performed before shipment?
Standard routine tests include ratio, polarity, and insulation resistance measurements. Specific type tests like lightning impulse are subject to confirmation. Request the detailed test protocol for your project.
Q5: Can the rated voltage ratio be customized for specific projects?
Custom voltage ratios and dual secondary windings are available based on project requirements. Standard models include 3kV, 6kV, and 10kV primary ratings. Contact our sales team for lead times.
Q6: Is this an epoxy cast resin voltage transformer?
Yes, the JDZ10 series is an indoor epoxy cast resin voltage transformer. It is widely used in 50Hz and 60Hz indoor switchgear systems up to 10kV.
Q7: What rated insulation level applies to the 10kV model?
The JDZ10-10A model features a rated insulation level of 12/42/75 kV. This ensures reliable performance in 10kV indoor distribution networks. Verify system overvoltage conditions with our technical department.