Overview
The JDZQN-10 is an indoor epoxy cast-resin metering voltage transformer designed for 10kV medium-voltage systems. It features a compact, single-phase construction with solid epoxy resin insulation, suitable for installation in 12kV class switchgear and metering cabinets.
Optimized for accurate energy metering and voltage measurement, it delivers a standardized 100V secondary output with accuracy classes of 0.2 (20VA) or 0.5 (50VA). The unit complies with Q/GDW 11682-2017 and is intended for revenue metering, power monitoring, and voltage indication in indoor AC systems operating at 50Hz.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Model | JDZQN-10 |
| Type | Indoor metering voltage transformer |
| Voltage ratio | 10 / 0.1 kV |
| Secondary voltage | 100 V |
| System voltage | 10 kV (12 kV class) |
| Frequency | 50 Hz |
| Accuracy class | 0.2 (20 VA), 0.5 (50 VA) |
| Max. output | 500 VA |
| Insulation level | 12/42/75 kV |
| Ambient temperature | -25°C to +55°C |
| Insulation material | Epoxy cast-resin |
| Installation | Indoor switchgear or metering cabinet |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Resin casting insulation
- Q: Not grounded type
- N: Indoor type
- 10: Voltage level code for 10kV system application
Construction
The JDZQN-10 employs a fully enclosed epoxy cast-resin construction, providing robust mechanical strength and excellent dielectric performance for indoor environments. The core and windings are encapsulated in high-quality epoxy resin under vacuum conditions, ensuring void-free insulation and long-term stability. This design eliminates the need for oil or gas insulation, making it maintenance-free and suitable for confined spaces within switchgear or metering panels. The primary and secondary terminals are integrated into the resin body, with clear polarity markings for safe and correct connection during installation.
Technical Parameters
Service Conditions
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000 m above sea level
- Relative humidity: daily average ≤ 95%, monthly average ≤ 90%
- Installation environment: Indoor, non-corrosive, free from explosive or flammable gases, and without significant vibration or shock
Technical Parameters
The JDZQN-10 is an indoor epoxy cast-resin metering voltage transformer rated for 10 kV systems. It features a standard secondary voltage of 100 V, operates within a temperature range of -5°C to +40°C, and is suitable for installations up to 1000 m altitude. The unit complies with relevant IEC standards for metering accuracy and insulation performance.
Voltage Transformer Data
| Type (Ratio) |
Rated Voltage (kV) |
Accuracy Class / Rated Output (VA) |
Burden (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZQN-10 | 10 / 0.1 | 0.2 — 20 | 500 | 12 / 42 / 75 |
| 0.5 — 50 | 500 |
Installation & Wiring
Installation Diagram
The JDZQN-10 transformer is designed for indoor installation within switchgear or metering cabinets. Mounting is achieved via the base with overall base length of 378mm and base width of 180mm, using appropriate fasteners through the mounting holes. Ensure adequate clearance around the unit for ventilation and electrical safety. The primary terminal uses 2-M10 bolts, and a grounding bolt (M8 reference) must be securely connected to the cabinet ground.
Wiring Diagram
The wiring diagram illustrates the connection scheme for three-phase line voltage measurement. Primary terminals must be connected according to the approved switchgear wiring drawing, observing correct phase sequence and terminal direction. Secondary terminals are polarity-sensitive; verify polarity before connecting to energy meters or measuring instruments to ensure accurate metering. All secondary wiring should be tightly secured to minimize voltage drop and measurement error. The grounding point must be connected in accordance with the cabinet grounding scheme.
Selection & FAQs
Selection Guide
- Confirm the connection: select JDZQN-10 only for a 10kV line-to-line primary and standard 100V secondary; it is not a phase-to-earth residual-voltage VT.
- Choose the accuracy duty: specify class 0.2 at 20VA for precision or revenue metering, or class 0.5 at 50VA for general measurement and indication.
- Calculate the secondary burden: include meters, transducers and lead voltage drop, and keep the total within the rated VA for the selected accuracy class.
- Do not use 500VA as metering burden: that figure is the maximum thermal output, while guaranteed measurement accuracy applies at 20VA or 50VA.
- Approve installation conditions: verify 50Hz operation, 12/42/75kV insulation, the 378 × 180mm base, terminal polarity, −5°C standard minimum and 1000m altitude limit.
Frequently Asked Questions
Q1: Which accuracy class is best for revenue metering?
Select the 0.2 accuracy class for revenue billing applications. It provides 20 VA rated output with high precision for 10 kV systems. Confirm your specific burden requirements with our engineering team.
Q2: Can this voltage transformer be installed outdoors?
No, this is strictly an indoor epoxy cast-resin unit. It requires a non-corrosive environment free from explosive gases and significant vibration. The epoxy housing provides necessary protection for these strict indoor service conditions.
Q3: What is the rated insulation level for this 10kV VT?
The JDZQN-10 features a rated insulation level of 12/42/75 kV. This ensures reliable dielectric strength and performance within standard 10 kV distribution networks. The cast-resin design eliminates the need for additional insulation maintenance.
Q4: Can the transformation ratio be customized for specific projects?
The standard ratio is 10/0.1 kV. Custom ratios or specific accuracy classes are subject to factory confirmation. Please contact our sales team with your exact technical specifications for a tailored quote.
Q5: What factory tests are performed before shipment?
Standard routine tests are conducted to ensure compliance with relevant IEC standards. Specific type tests or third-party certifications are subject to confirmation. Contact us to discuss your project’s specific testing and documentation requirements.
Q6: Where is this indoor 10kV voltage transformer typically applied?
This epoxy cast-resin VT is ideal for indoor 10 kV switchgear, metering panels, and power distribution networks. It provides reliable voltage signal isolation for protective relays and energy meters. The compact design optimizes space within modern panels.
Q7: Are high-altitude installations supported by this standard model?
The standard model is rated for altitudes up to 1000 m above sea level. For installations exceeding this limit, derating or special design modifications are required. Please consult our engineers for high-altitude project evaluations.