Product Overview
JDZF9-3/6/10GY/185 is an indoor epoxy cast-resin voltage transformer designed for medium-voltage switchgear applications. It is suitable for 50Hz / 60Hz AC power systems and is used for voltage measurement, energy metering, voltage monitoring, relay protection and residual-voltage supervision.
This model should be positioned differently from fused compact cabinet VTs and large three-phase anti-ferroresonance VTs. The JDZF9-3/6/10GY/185 series is best described as a compact indoor cast-resin VT/PT with multiple secondary output options, especially suitable for switchgear projects that require metering and protection outputs in a controlled cabinet space.
Product Display
Application Position
The transformer is installed in the voltage transformer compartment of indoor air-insulated switchgear. The primary side is connected to the medium-voltage circuit, while the secondary outputs supply voltage signals to meters, protection relays, control devices and residual-voltage monitoring circuits.
Main Applications
- Indoor 3kV, 6kV and 10kV medium-voltage switchgear
- 3.6kV, 7.2kV and 12kV class distribution systems
- Voltage measurement and energy metering
- Relay protection voltage input circuits
- Residual-voltage and open-delta monitoring circuits
- Switchgear projects requiring compact 185mm class indoor VT installation
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZF9-3/6/10GY/185 |
| Related sample type codes | JDZX9-3GJ / JDZX9-6GJ / JDZX9-10GJ |
| Product type | Indoor voltage transformer / potential transformer |
| Insulation structure | Indoor epoxy cast-resin insulation |
| Installation | Indoor switchgear installation |
| System voltage | 3kV, 6kV and 10kV systems |
| International voltage class | 3.6kV, 7.2kV and 12kV classes |
| Rated frequency | 50Hz / 60Hz |
| Ambient temperature | -5°C to +40°C |
| Creepage distance | 240mm reference |
| Fuse within primary circuit | 0.5A or 0.2A according to configuration |
| Typical function | Metering, monitoring, relay protection and residual-voltage output |
| Approximate weight | 45kg |
| Standards | GB1207-2006, IEC60044-2:2003 and project-specific requirements |
Application Fit
Suitable For
- Indoor switchgear requiring compact epoxy cast-resin VT installation
- 3kV, 6kV and 10kV medium-voltage power systems
- Metering circuits requiring 100/√3V secondary output
- Protection circuits requiring 100/3V residual-voltage output
- Projects that need multiple secondary winding combinations in one compact indoor VT
- Switchgear where 185mm class body width and approx. 45kg weight are acceptable
Not Recommended For
- Outdoor exposed installation without enclosure protection
- High-frequency electronic transformer applications
- Oil-immersed voltage transformer applications
- Projects requiring a large outdoor VT body or oil insulation
- Applications exceeding the listed insulation level, creepage distance or output capacity without technical confirmation
Installation Conditions
- Installation location: indoor air-insulated switchgear or protected indoor cabinet
- Rated frequency: 50Hz / 60Hz power-frequency AC system
- Ambient temperature: -5°C to +40°C
- Clearance: confirm primary terminal clearance and cabinet insulation distance before installation
- Terminal access: secondary terminal box should remain accessible for wiring and inspection
- Maintenance: clean resin surface and inspect terminal fastening during routine maintenance
Technical Structure
The JDZF9-3/6/10GY/185 series uses a compact epoxy cast-resin body with primary and secondary windings encapsulated in resin. Its secondary configuration can support metering, protection and residual-voltage functions according to the project wiring design.
| Component | Description |
|---|---|
| Epoxy resin body | Indoor cast-resin insulation for mechanical support, insulation reliability and moisture resistance |
| Primary winding | Designed for 3kV, 6kV or 10kV system voltage depending on model selection |
| Metering secondary | Provides 100/√3V output for voltage measurement and metering circuits |
| Protection secondary | Provides 100/3V or related output for protection and residual-voltage functions |
| Fuse element | Primary fuse rating shown as 0.5A or 0.2A according to model configuration |
| Secondary terminal box | Low-voltage terminal area for wiring and terminal identification |
| Mounting base | Metal base for fixed cabinet installation |
Model Designation
- J = Voltage transformer
- D = Single-phase voltage transformer structure
- Z = Epoxy cast-resin insulation
- F / X = Secondary function or product structure code, depending on specific model series
- 9 = Design sequence / structure series code
- 3 / 6 / 10 = Rated system voltage code for 3kV, 6kV or 10kV applications
- GJ / GY = Structure or configuration code, subject to approved drawing and nameplate
- 185 = Outline width / structure size code
Technical Data
The following technical data is reorganized from the product sample. For international product pages, the domestic 3kV / 6kV / 10kV ratings should be expressed with their corresponding 3.6kV / 7.2kV / 12kV insulation classes.
| Model | Rated
Voltage Ratio |
Rated
Insulation Level |
Accuracy Class /
Rated Output |
Max.
Output |
Primary
Fuse |
Creepage
Distance |
|---|---|---|---|---|---|---|
| JDZX9-3GJ | 3000/√3 / 100/√3 / 100/3 | 3.6/25/40kV | 0.2/6P(3P)—60/150 0.5/6P(3P)—120/150 1/6P(3P)—300/150 3/6P(3P)—600/150 |
800VA | 0.5A | 240mm |
| JDZX9-6GJ | 6000/√3 / 100/√3 / 100/3 | 7.2/30/60kV | 0.5A | |||
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/3 | 12/42/75kV | 0.2A | |||
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/√3 / 100/3 | 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 |
400/400VA | |||
| JDZX9-10GJ | 10000/√3 / 100/√3 / 100/√3 / 100/3 |
Technical notes:
- One transformer is supplied with one selected accuracy class and rated output combination.
- The 100/√3V secondary output is typically used for metering or voltage monitoring.
- The 100/3V secondary output is typically used for residual-voltage or open-delta protection functions.
- The listed sample includes 0.5A and 0.2A primary fuse configurations depending on voltage class.
- If the required parameters exceed the table range, confirmation should be made between manufacturer and purchaser.
Installation and Dimensions
Dimension Reference
| Item | Reference Value |
|---|---|
| Overall base length | 400mm |
| Main body length | 334mm |
| Top terminal spacing | 294mm reference |
| Overall width | 185mm |
| Body width reference | 186mm |
| Overall height | Approx. 283mm reference |
| Mounting length reference | 328mm / 355mm reference from drawing |
| Primary terminal bolt | M10 reference |
| Approximate weight | 45kg |
Terminal and Wiring Notes
- The sample shows two wiring diagrams, including configurations for metering and residual-voltage output.
- Confirm whether the project requires one metering secondary or multiple secondary windings.
- Residual-voltage terminals such as da and dn should be connected according to the relay protection scheme.
- Confirm primary fuse rating, terminal polarity and grounding before commissioning.
- Secondary terminal box clearance should be reserved in the switchgear compartment.
Compliance and Testing
The product information references GB1207-2006 and IEC60044-2:2003. For export projects, the final standard reference may be aligned with the purchase specification and applicable voltage transformer standards required by the customer.
Typical Routine Tests
- Visual inspection and nameplate verification
- Ratio verification
- Polarity and terminal marking check
- Accuracy test at specified rated burden
- Power-frequency withstand voltage test
- Induced withstand voltage test where applicable
- Insulation resistance test
- Primary fuse and terminal inspection
- Residual-voltage winding verification when supplied
Engineering Notes
- Use this model when a compact 185mm class indoor cast-resin VT is needed for metering and protection functions.
- For export pages, describe 3kV, 6kV and 10kV versions as 3.6kV, 7.2kV and 12kV class products according to insulation level.
- This product is not a high-frequency transformer; it is a 50Hz / 60Hz power-frequency VT/PT.
- Confirm whether 100/3V residual output is required before selecting the secondary configuration.
- Check terminal box position, mounting size and approximate 45kg product weight during cabinet layout design.
- For 10kV projects, confirm whether 0.2A primary fuse configuration is required.
Selection Guide
Select by voltage class: Choose JDZF9-3 for 3kV systems, JDZF9-6 for 6kV systems and JDZF9-10GY for 10kV systems. For international pages, express them as 3.6kV, 7.2kV and 12kV class products.
Select by residual-voltage requirement: If the protection scheme needs open-delta or residual-voltage monitoring, select a configuration with 100/3V output and confirm da/dn terminal wiring before production.
Select by output capacity: Use the 800VA maximum output configuration for higher secondary load requirements. Use the 400/400VA configuration when dual secondary output is needed.
Select by cabinet layout: Confirm 185mm width, 400mm base length, terminal box position and primary terminal clearance before approving the switchgear design.
Select by international inquiry clarity: State the model, voltage class, actual voltage ratio, accuracy/output combination, fuse rating, residual-voltage requirement and quantity in the inquiry.