Overview
The JDZF9-10GY/185 is an indoor epoxy cast-resin voltage transformer designed for 3kV, 6kV, and 10kV medium-voltage switchgear systems. It features a solid cast-resin insulation structure suitable for 50Hz or 60Hz AC power networks, providing reliable performance in controlled indoor environments.
This compact VT delivers multiple secondary outputs for metering, protection, and residual-voltage monitoring applications. It complies with GB1207-2006 and IEC60044-2:2003 standards, ensuring accuracy and safety in air-insulated switchgear installations where space efficiency and functional versatility are required.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 3kV, 6kV, 10kV |
| Voltage Class | 3.6kV, 7.2kV, 12kV |
| Frequency | 50Hz / 60Hz |
| Insulation Type | Epoxy cast-resin |
| Installation | Indoor switchgear |
| Ambient Temperature | -5°C to +40°C |
| Creepage Distance | 240mm (reference) |
| Primary Fuse Rating | 0.5A or 0.2A (configurable) |
| Secondary Outputs | Metering (100/√3V), Protection (100/3V) |
| Weight | Approx. 45kg |
| Standards | GB1207-2006, IEC60044-2:2003 |
| Application Functions | Voltage measurement, energy metering, relay protection, residual-voltage supervision |
Model Designation
- J: Voltage transformer
- D: Single-phase construction
- Z: Epoxy cast-resin insulation
- F: Secondary function or structural variant
- 9: Design series code
- 10: Rated system voltage (10kV)
- GY: Configuration code per approved drawings
- 185: Outline width / structural size code (185mm class)
Construction
The JDZF9-10GY/185 features a robust epoxy cast-resin construction, fully encapsulating the magnetic core and windings in a solid dielectric matrix. This design provides excellent mechanical strength, moisture resistance, and long-term insulation stability under normal indoor operating conditions. The primary winding is integrated with an internal fuse (0.5A or 0.2A) for overcurrent protection, while the secondary windings are precisely wound to meet accuracy requirements for both metering and protection classes. The entire assembly is housed in a compact, flame-retardant resin body with clearly marked terminals, suitable for secure mounting within the VT compartment of air-insulated switchgear. Surface finish and creepage distance are engineered to meet standard insulation coordination for 12kV-class indoor applications.
Technical Parameters
Service Conditions
- Ambient temperature: -25°C to +40°C
- Altitude: ≤1000 m above sea level
- Relative humidity: Average daily value not exceeding 95%; average monthly value not exceeding 90%
- Installation environment: Indoor, non-corrosive, free from explosive dust or gas, and without severe vibration or shock
Technical Parameters
The JDZF9-10GY/185 is an indoor epoxy cast-resin voltage transformer rated for a 12kV insulation class (corresponding to a 10kV system). It features a primary fuse configuration of 0.2A, operates within standard environmental conditions up to 1000 m altitude, and complies with relevant IEC and GB standards for metering and protection applications.
Model Variants
| Type (Ratio) |
Rated Voltage(kV) |
Rated Insulation Level(kV) |
Accuracy Class (Protection/ Measurement) |
Rated Output (VA) |
Max. Output (VA) |
Primary Fuse (A) |
Creepage Distance (mm) |
|---|---|---|---|---|---|---|---|
| JDZX9-3GJ | 3000/√3 / 100/√3 / 100/3 | 3.6/25/40 | 0.2/6P(3P)—60/150 0.5/6P(3P)—120/150 1/6P(3P)—300/150 3/6P(3P)—600/150 |
60/150 120/150 300/150 600/150 |
800 | 0.5 | 240 |
| JDZX9-6GJ | 6000/√3 / 100/√3 / 100/3 | 7.2/30/60 | 0.2/6P(3P)—60/150 0.5/6P(3P)—120/150 1/6P(3P)—300/150 3/6P(3P)—600/150 |
60/150 120/150 300/150 600/150 |
800 | 0.5 | 240 |
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/3 | 12/42/75 | 0.2/6P(3P)—60/150 0.5/6P(3P)—120/150 1/6P(3P)—300/150 3/6P(3P)—600/150 |
60/150 120/150 300/150 600/150 |
800 | 0.2 | 240 |
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/√3 / 100/3 | 12/42/75 | 0.2/0.2/6P(3P)—30/30/150 0.2/0.5/6P(3P)—30/40/150 0.5/0.5/6P(3P)—60/60/150 |
30/30/150 30/40/150 60/60/150 |
400/400 | 0.2 | 240 |
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/√3 / 100/3 | 12/42/75 | 0.2/0.2/6P(3P)—30/30/150 0.2/0.5/6P(3P)—30/40/150 0.5/0.5/6P(3P)—60/60/150 |
30/30/150 30/40/150 60/60/150 |
400/400 | 0.2 | 240 |
Installation & Wiring
Installation Diagram
The JDZF9-10GY/185 voltage transformer is designed for indoor installation within switchgear compartments. Mounting is achieved via base brackets using the specified mounting length reference of 328mm or 355mm as indicated in the engineering drawing. Ensure adequate clearance around the unit for ventilation and secondary terminal box access.
Wiring Diagram
The wiring diagram illustrates standard connections for metering (e.g., a, n) and residual-voltage output (da, dn) windings. Confirm project-specific requirements for single or multiple secondary windings. Residual-voltage terminals da and dn must be connected per the relay protection scheme. Verify primary terminal polarity, fuse rating, and proper grounding before energizing the unit. Reserve sufficient space in the switchgear compartment for the secondary terminal box.
Selection & FAQs
Selection Guide
- Resolve the model designation: the page title says JDZF9-10GY/185, while the rating table says JDZX9-GJ; require an approved nameplate schedule and drawing before applying any listed value.
- Match voltage and insulation: the table covers 3/√3kV, 6/√3kV and 10/√3kV versions with 3.6/25/40kV, 7.2/30/60kV and 12/42/75kV insulation levels.
- Select the winding package: choose one measuring winding with 150VA protection, or two separate measuring windings when metering and monitoring circuits must be isolated.
- Coordinate fuse and burden: confirm the integrated primary-fuse rating and use the listed accuracy VA; 800VA or 400/400VA values are thermal limits, not guaranteed accuracy burdens.
- Approve the installation: verify the 185mm construction code, 328mm or 355mm mounting reference, terminal-box clearance, 240mm creepage, voltage factor, ambient range and grounding scheme.
Frequently Asked Questions
Q1: Can this epoxy cast-resin transformer be installed in corrosive environments?
No, it requires a non-corrosive indoor environment free from explosive dust, gas, or severe vibration. Ensure ambient temperature stays between -25°C and +40°C. Contact us for harsh environment solutions.
Q2: Which accuracy class is suitable for protection and measurement applications?
Yes, multiple classes are available for these applications. Measurement classes include 0.2 to 3, and protection classes include 3P or 6P. Specify your exact burden requirements during ordering.
Q3: How does the 12kV insulation class apply to standard power systems?
Yes, it perfectly matches 10kV distribution systems. The 12kV insulation level ensures reliable dielectric performance per IEC and GB requirements. Confirm your exact system voltage during ordering.
Q4: What factory tests are performed before shipping the JDZF9-10GY/185?
Yes, comprehensive testing is performed before shipment. Standard routine tests include ratio, polarity, and insulation resistance checks per IEC and GB standards. Request the test certificate with your inquiry.
Q5: Are the primary fuse configurations customizable for different protection needs?
Yes, modifications are possible based on project needs. The standard configuration features a 0.2A primary fuse, but custom ratings are subject to factory confirmation. Provide your single-line diagram for evaluation.
Q6: Where is this 10kV indoor voltage transformer typically applied?
Yes, it is widely used in power distribution networks. It is primarily applied in indoor switchgear and control panels for metering and protection. Contact our engineering team for specific application support.
Q7: Do these voltage transformers comply with international IEC standards?
Yes, they meet global regulatory requirements. The transformer complies with relevant IEC and GB standards for instrument transformers. Verify specific standard editions with our sales team.