JDZX10-10B/180 Indoor Epoxy Cast-Resin Voltage Transformer

Product Overview

JDZX10-10B/180 is an indoor epoxy cast-resin grounded voltage transformer designed for 10kV medium-voltage switchgear. It is used in 50Hz / 60Hz AC systems to provide secondary voltage signals for voltage measurement, electric energy metering, residual-voltage monitoring and relay protection.

This product should be clearly separated from the JDZ10-10B/180 line-voltage transformer. JDZX10-10B/180 uses a grounded phase-to-neutral voltage ratio such as 10/√3 : 0.1/√3 : 0.1/3kV. It is more suitable when the project requires 100/√3V metering output and 100/3V residual-voltage or open-delta output for protection circuits.

Product Display

Application Position

JDZX10-10B/180 is installed in indoor switchgear, metering cabinets or voltage transformer compartments. The primary terminal is connected between phase and neutral/grounded reference according to the switchgear design, while the secondary terminals supply voltage signals to meters, monitoring equipment and protection relays.

Main Applications

• Indoor 10kV medium-voltage switchgear
• 12kV class air-insulated switchgear and distribution cabinets
• Phase-to-neutral voltage measurement
• Electric energy metering and voltage monitoring
• Relay protection voltage input circuits
• Residual-voltage or open-delta protection circuits
• Cabinet applications requiring compact 180mm VT structure

Key Specifications

Application Fit

Suitable For

• 10kV indoor switchgear requiring a grounded voltage transformer
• 12kV class systems requiring phase-to-neutral voltage measurement
• Metering circuits requiring 0.1/√3kV secondary voltage
• Protection circuits requiring 3P or 6P accuracy output
• Residual-voltage monitoring circuits requiring 0.1/3kV output
• Projects requiring compact 180mm indoor cast-resin VT installation

Not Recommended For

• Outdoor exposed installation without enclosure protection
• Line-voltage applications requiring 10/0.1kV output only
• Applications requiring 0.22kV auxiliary power output
• High-frequency electronic transformer applications
• Oil-immersed voltage transformer applications
• Three-phase integrated handcart VT applications

Installation Conditions

• Installation location: indoor air-insulated switchgear or protected indoor cabinet
• Rated frequency: 50Hz / 60Hz power-frequency AC system
• Ambient temperature: -25°C to +40°C
• Clearance: confirm primary terminal clearance and insulation distance according to cabinet design
• Grounding: confirm grounding and neutral reference wiring before commissioning
• Maintenance: inspect resin surface, terminal fastening and grounding point during routine service

Technical Structure

The JDZX10-10B/180 series uses an epoxy resin cast body with the primary winding, secondary winding and magnetic core enclosed in solid insulation. Its technical focus is grounded voltage transformation, which makes it different from JDZ10 line-voltage models that use 10/0.1kV ratios.

Model Designation

• J = Voltage transformer
• D = Single-phase voltage transformer structure
• Z = Epoxy cast-resin insulation
• X = Grounded voltage transformer / residual-voltage related secondary function code
• 10 = Design sequence or product series code
• 10 = Rated system voltage code for 10kV applications
• B = Structure or configuration code, subject to approved drawing and nameplate
• 180 = Compact structure / outline size code

Technical Data

The following data is reorganized from the JDZX10-10B/180 product sample. For international product pages, this model should be described as a 10kV grounded voltage transformer for 12kV class switchgear.

Technical notes:

• One transformer is supplied with one selected accuracy class and corresponding rated output combination.
• The 0.1/√3kV output is normally used for voltage measurement, metering and monitoring.
• The 0.1/3kV output is normally used for residual-voltage or open-delta protection circuits.
• The multi-secondary version is suitable when metering and protection circuits need separated secondary windings.
• If required data exceeds the listed scope, parameters should be confirmed by agreement between manufacturer and purchaser.

Installation and Dimensions

Dimension Reference

Terminal and Wiring

• The sample wiring diagrams show grounded VT connections with residual-voltage output.
• Primary connection should follow the A-N phase-to-neutral wiring scheme in the project drawing.
• Secondary terminals may include 1a, 1n, 2a, 2n, da and dn depending on configuration.
• The da/dn terminals should be connected according to the residual-voltage or open-delta protection scheme.
• Terminal polarity, grounding and cabinet clearance must be checked before commissioning.

Compliance and Testing

The product information references GB20840.3-2013 and IEC61869-3:2011. For export projects, the final standard reference should be aligned with the buyer’s technical specification, applicable grid requirements and approved test plan.

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
• Residual-voltage winding verification
• Secondary terminal and grounding inspection

Engineering Notes

• Use JDZX10-10B/180 when the project requires 10/√3 primary voltage and 0.1/√3 secondary output.
• Use this model instead of JDZ10-10B/180 when residual-voltage output or grounded VT configuration is required.
• For export pages, write the product as a 10kV system / 12kV class indoor grounded voltage transformer.
• Confirm whether the project requires 3P or 6P protection class before final model selection.
• Confirm whether one metering secondary or two separated secondary windings are needed.
• Do not describe this product as a high-frequency transformer; it is a 50Hz / 60Hz power-frequency VT/PT.

Selection Guide

Select by grounding requirement: Choose JDZX10-10B/180 when the system requires a grounded phase-to-neutral VT ratio, such as 10/√3 : 0.1/√3 : 0.1/3kV.

Select by output function: Use 0.1/√3kV output for metering and monitoring. Use 0.1/3kV output when residual-voltage or open-delta protection is required.

Select by accuracy requirement: Use 0.2 or 0.5 class for metering. Use 3P or 6P class for protection circuits. Confirm rated burden before production.

Select by difference from JDZ10: JDZ10-10B/180 is suitable for line-voltage output such as 10/0.1kV or 10/0.1/0.22kV. JDZX10-10B/180 is suitable for grounded output such as 10/√3 and residual 0.1/3kV.

Select by inquiry clarity: A clear inquiry should state model, primary ratio, secondary ratio, accuracy class, protection class, rated burden, insulation level, terminal drawing and quantity.

FAQs