Overview
The RZL-10 and JDZ10-3, 6, 10A(B) series are single-phase, indoor, cast resin (epoxy resin) voltage transformers designed for precise voltage measurement, energy metering, voltage monitoring, and relay protection in 3 kV, 6 kV, and 10 kV medium-voltage AC power systems. Operating on electromagnetic induction, these inductive voltage transformers provide galvanically isolated secondary outputs proportional to the primary voltage, ensuring reliable performance in switchgear and distribution panels.
Compliant with IEC 61869 and applicable GB standards, the series delivers stable accuracy under specified burden conditions. The fully enclosed epoxy resin construction offers excellent moisture resistance, high mechanical strength, and long-term insulation stability for indoor applications.
Key Ratings Snapshot
| Parameter | Value |
|---|---|
| System voltage class | 3 kV, 6 kV, 10 kV (indoor) |
| Rated frequency | 50 Hz or 60 Hz |
| Rated voltage ratio | 3000/100 V, 6000/100 V, 10000/100 V |
| Residual voltage ratio (AG/BG) | 3000/sqrt(3)/100/sqrt(3)/100/3 V, etc. |
| Accuracy classes | 0.2, 0.5, 1 (metering); 6P (protection) |
| Burden power factor | cos phi = 0.8 (lagging) |
| Limit output | 150 VA (A), 300 VA (B), 400 VA (BG) |
| Insulation level (Um/AC/Impulse) | 3.6/25/40 kV, 7.2/32/60 kV, 12/42/75 kV |
| Construction | Epoxy resin cast, single-phase, indoor |
| Standards compliance | IEC 61869-1/-3; GB 1207-2006; GB 20840.1/3 |
Model Designation
- RZL-10: Series designation (equivalent to JDZ10 family)
- JDZ10: Cast resin indoor inductive voltage transformer series
- 3 / 6 / 10: Voltage class in kV
- A / B: Output capacity variant (A: standard; B: enhanced)
- x + G suffix (AG/BG): Residual voltage winding for earth fault detection
Construction
The transformer features a compact, single-phase design with core and windings integrally cast in epoxy resin, forming a fully enclosed, moisture-resistant unit. This construction ensures stable insulation performance, high mechanical strength, and resistance to environmental aging, making it ideal for long-term indoor service in MV switchgear.
Laminated silicon steel forms the magnetic core, while primary and secondary terminals are arranged to meet safe clearance requirements in panel installations. Selected variants include an open-delta (residual) winding for grounding and earth fault detection applications.
Technical Parameters
Service Conditions
- Installation environment: Indoor only
- Altitude: <= 3000 m above sea level
- Ambient temperature: -5 deg C to +40 deg C
- Relative humidity: Max 65% at +20 deg C reference
- Pollution degree: II (moderate contamination)
- Environmental conditions: Free from corrosive gases, explosive media, or severe vibration
Technical Data
| Type | Rated Voltage Ratio (V) |
Frequency (Hz) |
Accuracy Class and Rated Output (VA) |
Limit Output (VA) |
Rated Insulation Level (kV) |
|||
|---|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 6P | |||||
| JDZ10-3A | 3000/100 | 50/60 | 150 | 30 | 60 | 150 | 3.6/25/40 | |
| JDZ10-6A | 6000/100 | 50/60 | 15 | 30 | 60 | 150 | 7.2/32/60 | |
| JDZ10-10A | 10000/100 | 50/60 | 15 | 30 | 60 | 150 | 12/42/75 | |
| JDZ10-3B | 3000/100 | 50/60 | 25 | 50 | 90 | 300 | 3.6/25/40 | |
| JDZ10-6B | 6000/100 | 50/60 | 25 | 50 | 90 | 300 | 7.2/32/60 | |
| JDZ10-10B | 10000/100 | 50/60 | 25 | 50 | 90 | 300 | 12/42/75 | |
| JDZx10-3AG | 3000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 40 | 60 | 50 | 150 | 150 | 3.6/25/40 |
| JDZx10-6AG | 6000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 40 | 60 | 50 | 150 | 150 | 7.2/32/60 |
| JDZx10-10AG | 10000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 40 | 60 | 50 | 150 | 150 | 12/42/75 |
| JDZx10-3BG | 3000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 40 | 90 | 50 | 400 | 400 | 3.6/25/40 |
| JDZx10-6BG | 6000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 50 | 90 | 50 | 400 | 400 | 7.2/32/60 |
| JDZx10-10BG | 10000/sqrt(3)/100/sqrt(3)/100/3 | 50/60 | 50 | 90 | 50 | 400 | 400 | 12/42/75 |
Installation & Wiring
Installation Diagram
For single-phase applications, connect the primary terminals to the phase conductor and reference point per system configuration. In three-phase systems, three units are connected in wye for phase voltage measurement. AG/BG variants enable open-delta connection for residual voltage and earth fault detection. Secondary circuits must be grounded at one point and protected by fuses or MCBs as required.
Outline Dimensions
| Model | Height (mm) | Width (mm) | Depth (mm) | Mounting Hole Pattern | phi Primary Terminal (mm) |
|---|---|---|---|---|---|
| JDZ10-3A/B | 320 | 180 | 120 | 200 x 120 mm | 8 |
| JDZ10-6A/B | 360 | 200 | 130 | 220 x 130 mm | 10 |
| JDZ10-10A/B | 400 | 220 | 140 | 240 x 140 mm | 12 |
| JDZx10-AG/BG | 420 | 230 | 150 | 250 x 150 mm | 12 |
Selection & FAQs
Selection Guide
- Determine system voltage class (3/6/10 kV) and frequency (50/60 Hz).
- Calculate total burden: sum of meter/relay VA ratings plus wiring losses (use cos phi = 0.8 lagging).
- Select accuracy class: 0.2/0.5/1 for metering; 6P for protection; specify per winding.
- Choose A variant for standard burden (<=150 VA limit); B or BG for higher burden or multiple devices.
- Use AG/BG variants only if earth fault detection via residual voltage (open-delta) is required.
Frequently Asked Questions
Q1: Is this single-phase voltage transformer suitable for outdoor installation?
No, this epoxy resin voltage transformer is strictly for indoor installation. It requires an environment free from corrosive gases, explosive media, and severe vibration. Please contact our engineering team for outdoor-rated alternatives.
Q2: Which accuracy class is suitable for protective relaying?
The 6P accuracy class is designated for protection and relaying applications. For metering, select the 0.2, 0.5, or 1 classes based on your required precision. Confirm specific rated outputs with our technical team.
Q3: What rated voltage ratios are available for this series?
The RZL-10 series offers 3000/100V, 6000/100V, and 10000/100V rated voltage ratios. All models operate at 50/60Hz with a standard 150VA limit output. Specify your primary system voltage when requesting a quote.
Q4: Are routine factory tests performed before shipment?
Yes, standard routine tests are conducted prior to dispatch to ensure compliance with technical parameters. Special witnessing or type test requirements are subject to confirmation. Contact our sales department for detailed test certificates.
Q5: Can the insulation level be customized for specific projects?
Standard insulation levels are 3.6/25/40kV, 7.2/32/60kV, and 12/42/75kV for the respective models. Custom insulation requirements are subject to factory confirmation based on your specific project parameters.
Q6: Where is this epoxy resin voltage transformer typically applied?
It is primarily applied in indoor 3kV, 6kV, and 10kV AC power systems for voltage measurement and relay protection. The epoxy resin casting ensures high dielectric strength and mechanical stability.
Q7: Why is the maximum installation altitude limited to 3000 meters?
Standard designs are validated for altitudes up to 3000 meters above sea level to maintain dielectric properties and cooling efficiency. High-altitude derating or special design modifications are subject to factory confirmation.