JDZX6-11, JDZC6-11 Outdoor Epoxy Cast-Resin Voltage Transformer

Product Overview

JDZX6-11 / JDZC6-11 series voltage transformers are outdoor epoxy cast-resin fully enclosed voltage transformers designed for medium-voltage power systems. They are suitable for AC systems with rated frequency of 50Hz or 60Hz and are used for electric energy metering, voltage monitoring and relay protection.

This product is different from indoor cabinet-type fused VTs such as JDZ8 or JDZ10. The JDZX6-11 / JDZC6-11 series is positioned as an outdoor fully enclosed cast-resin VT/PT, with a larger body, outdoor insulation layout and wiring options suitable for line-side voltage measurement and protection schemes.

Product Display

Application Position

JDZX6-11 / JDZC6-11 voltage transformers are normally installed in outdoor medium-voltage distribution systems, outdoor metering arrangements or outdoor switching equipment where voltage signals are required for instruments and protection devices. The product can be configured for V/V connection or Y/Y/Δ connection according to system wiring and relay protection requirements.

Main Applications

• Outdoor 10kV / 11kV distribution systems
• 12kV class medium-voltage power systems
• Electric energy metering circuits
• Voltage monitoring and voltage indication circuits
• Relay protection voltage input circuits
• Outdoor metering units and switching equipment requiring cast-resin voltage transformers

Key Specifications

Application Fit

Suitable For

• Outdoor 10kV and 11kV power distribution systems
• 12kV class voltage measurement and protection applications
• Outdoor energy metering and monitoring circuits
• Systems requiring 100V standard secondary voltage output
• Projects requiring optional 220V auxiliary power output
• V/V or Y/Y/Δ wiring schemes in outdoor medium-voltage applications

Not Recommended For

• Compact indoor switchgear cabinets where indoor JDZ8 or JDZ10 type VTs are more suitable
• High-frequency electronic transformer applications
• Oil-immersed voltage transformer applications
• Systems above the specified insulation level without technical confirmation
• Installations where outdoor clearance, grounding and terminal protection cannot be guaranteed

Installation Conditions

• Installation location: outdoor medium-voltage equipment or protected outdoor metering arrangement
• Rated frequency: 50Hz / 60Hz power-frequency AC system
• Ambient temperature: -5°C to +40°C
• Outdoor clearance: confirm phase-to-ground and phase-to-phase clearance according to project rules
• Grounding: grounding point must be connected before operation
• Maintenance: inspect resin surface, terminal fastening and secondary terminal box condition regularly

Technical Structure

Model Designation

• J = Voltage transformer
• D = Single-phase voltage transformer structure
• Z = Epoxy cast-resin insulation
• X = Residual voltage winding / special secondary function code depending on configuration
• C = Structure or design code for the JDZC series
• 6 = Design sequence / series code
• 11 = Rated voltage code for 11kV system application
• 225 = Structure or dimension code, subject to final manufacturer drawing

Technical Data

The following data is organized from the JDZ(X)C6-11/225 sample. For international pages, this product should be presented as an 11kV system / 12kV class outdoor voltage transformer, while the actual voltage ratio remains listed in the technical table.

Table 1: Metering and Auxiliary Power Output

Table 2: Residual Voltage / Protection Configuration

Technical notes:

• One transformer is supplied with one selected accuracy class and rated output combination.
• The 100V output is normally used for measurement or metering.
• The 220V output can be used as auxiliary power output when the project design requires it.
• The 100/3V residual winding can support residual-voltage or protection-related functions in Y/Y/Δ wiring schemes.

Installation and Dimensions

Dimension Reference

Terminal and Wiring

• Primary terminals are marked as A and B according to the drawing.
• Table 1 corresponds to a V/V wiring application with metering and power secondary outputs.
• Table 2 corresponds to a Y/Y/Δ wiring application with metering, power and residual/protection secondary outputs.
• Confirm terminal polarity before connecting meters or relays.
• Grounding must be completed before the transformer is energized.

Compliance and Testing

The product information references GB20840.3-2013 and IEC61869-3:2011. For export projects, the final compliance statement should be confirmed according to the technical agreement, local grid requirements and buyer specification.

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
• Secondary terminal and wiring verification
• Grounding point inspection

Engineering Notes

• Use this model for outdoor 10kV / 11kV systems requiring a 12kV class epoxy cast-resin voltage transformer.
• Choose V/V wiring for standard voltage measurement and auxiliary output applications.
• Choose Y/Y/Δ wiring when residual-voltage or protection-related secondary output is required.
• The 220V secondary output is useful when auxiliary power is required in the outdoor equipment scheme.
• Check the 53.5kg weight, 436mm base length and outdoor insulation clearance before installation.
• Do not describe this product as a high-frequency transformer; it is a 50Hz / 60Hz power-frequency VT/PT.

Selection Guide

Select by installation environment: Choose JDZX6-11 / JDZC6-11 when the voltage transformer must be installed in an outdoor environment. If the product is installed inside compact indoor switchgear, an indoor JDZ8 or JDZ10 type may be more suitable.

Select by secondary function: Use the 100V output for metering and voltage monitoring. Select the 220V output when auxiliary operating power is needed. Select the residual/protection winding when the protection scheme requires a 100/3V secondary output.

Select by wiring scheme: Use V/V connection for simpler metering and auxiliary power applications. Use Y/Y/Δ connection for more complete metering, auxiliary power and residual-voltage protection requirements.

Select by international specification: For overseas inquiries, specify the model, 11kV system voltage, 12kV insulation class, voltage ratio, secondary output, wiring scheme, rated burden and whether the project requires outdoor installation.

FAQs