Overview
The JDZC-3/6/10 series single-phase epoxy resin voltage transformers are precision electromagnetic instruments designed for accurate voltage measurement, energy metering, control circuits, and relay protection in 3â10 kV indoor AC power systems. Based on electromagnetic induction principles, these transformers deliver galvanically isolated secondary voltage signals proportional to the primary system voltage.
Featuring a compact semi-enclosed design with robust epoxy resin insulation, the JDZC series ensures reliable performance in indoor switchgear environments under Grade II pollution conditions, providing long-term stability against moisture, contamination, and mechanical stress.
Key Ratings Snapshot
| Parameter | Value |
|---|---|
| System voltage class | 3 kV / 6 kV / 10 kV (indoor) |
| Rated frequency | 50 Hz (60 Hz on request) |
| Rated voltage ratio | 3000/100/220 V, 6000/100/220 V, 10000/100/220 V |
| Accuracy classes | 0.2 or 0.5 |
| Rated output | 30â1500 VA (per accuracy class) |
| Maximum output capacity | 600â3000 VA |
| Insulation level (Um/Ud/Up) | JDZC-3: 3.6/25/40 kV JDZC-6: 7.2/32/60 kV JDZC-10: 12/42/75 kV |
| Creepage distance grade | Grade II pollution environment |
| Core material | Laminated silicon steel |
| Construction | Epoxy resin cast, semi-enclosed |
Model Designation
- J: Voltage transformer (VT)
- D: Single-phase configuration
- Z: Cast-resin (epoxy) insulated structure
- C: Semi-enclosed design
- 3 / 6 / 10: Voltage class (kV)
Construction
The JDZC series features a semi-enclosed epoxy resin cast structure that provides excellent electrical insulation, moisture resistance, and mechanical strength for indoor switchgear applications. The integrated primary and secondary windings are wound around a laminated silicon steel core, ensuring high magnetic efficiency and low losses.
Primary terminals are positioned at the top of the housing for secure connection, while standardized terminal markings (A/X, a/x, ad/xd) follow polarity conventions to support correct metering and protection circuit integration. The design maintains required electrical clearances and creepage distances for reliable operation in Grade II pollution environments.
Technical Parameters
Service Conditions
- Installation environment: Indoor only
- Altitude: <= 1000 m above sea level
- Ambient temperature: -5 deg C to +40 deg C
- Relative humidity: <= 85%
- Pollution environment: Grade II
- Environmental restrictions: Free from corrosive gases, explosive media, severe vibration, or mechanical shock
Technical Data
| Model | Rated Voltage Ratio (V) |
Accuracy Class Rated Output (VA) |
Maximum Output (VA) |
Rated Insulation Level (kV) Um/Ud/Up |
|---|---|---|---|---|
| JDZC-3/6/10 | 3000/100/220 6000/100/220 10000/100/220 |
0.2 class: 30 VA 0.5 class: 300 VA |
600 | 3.6/25/40 7.2/32/60 12/42/75 |
| 0.2 class: 30 VA 0.5 class: 400 VA |
800 | |||
| 0.2 class: 30 VA 0.5 class: 500 VA |
1000 | |||
| 0.2 class: 30 VA 0.5 class: 600 VA |
1200 | |||
| 0.2 class: 30 VA 0.5 class: 800 VA |
1500 | |||
| 0.2 class: 30 VA 0.5 class: 1000 VA |
2000 | |||
| 0.2 class: 30 VA 0.5 class: 1500 VA |
3000 |
Installation & Wiring
Installation Diagram
Proper installation ensures safe and accurate operation. Mount the transformer securely using base fixing holes, connect primary leads to top terminals with specified torque, and maintain adequate clearance for insulation and heat dissipation. Always ground the secondary circuit at one point per safety standards.
Outline Dimensions
| Model Variant | Height (mm) | Width (mm) | Depth (mm) | Mounting Hole Spacing (mm) |
|---|---|---|---|---|
| 600 VA | 380 | 180 | 160 | 150 x 120 |
| 800-1200 VA | 420 | 200 | 180 | 170 x 140 |
| 1500-2000 VA | 460 | 220 | 200 | 190 x 160 |
| 2000-3000 VA | 500 | 240 | 220 | 210 x 180 |
Selection & FAQs
Selection Guide
- Select voltage ratio based on system voltage (e.g., 10000/100 V for 10 kV systems) and required secondary voltage for meters/relays.
- Choose accuracy class 0.2 for revenue metering; 0.5 is suitable for general metering and protection.
- Calculate total secondary burden (meters + relays + wiring) and select rated output with 20-30% margin.
- Ensure maximum output capacity is not exceeded by combined metering, protection, and control loads.
- Verify insulation level (Um/Ud/Up) matches system requirements per GB/T 208-2007.
Frequently Asked Questions
Q1: Can this epoxy voltage transformer be installed outdoors?
No, it is strictly for indoor installation. It requires an environment free from corrosive gases, explosive media, and severe vibration. Contact us for outdoor-rated alternatives.
Q2: Which accuracy class is suitable for panel metering?
The 0.5 accuracy class is ideal for standard panel metering. It supports rated outputs from 30 VA up to 1500 VA. Specify your exact burden during ordering.
Q3: What primary voltage ratios are available for this model?
Standard ratios include 3000/100, 6000/100, and 10000/100. Secondary voltages can be configured for 100V or 220V. Custom ratio configurations are subject to factory confirmation.
Q4: How does the insulation level match 10kV switchgear?
The 12/42/75 kV insulation level perfectly matches 10kV systems. It provides a rated voltage of 12kV with 42kV power-frequency and 75kV impulse withstand capabilities. Verify system overvoltage conditions before final selection.
Q5: Are routine factory tests performed before shipment?
Yes, standard routine tests are conducted on every unit. Specific type tests or third-party certifications depend on project requirements and are subject to confirmation. Request the test protocol for details.
Q6: Where is the JDZC-3/6/10 voltage transformer typically applied?
It is designed for indoor power distribution and metering in 3kV to 10kV systems. The cast epoxy construction ensures reliable operation in Grade II pollution environments. Suitable for standard indoor switchgear applications.