Product Overview
The JDZX11-10/160 / UNE10 indoor epoxy cast-resin voltage transformer is a single-phase, phase-to-earth voltage transformer for medium-voltage switchgear. It is designed for voltage measurement, energy metering reference, voltage monitoring, residual-voltage output and relay protection in indoor AC systems with rated frequency of 50Hz or 60Hz.
This model should be differentiated from the previous JDZ11-10A/185 / UNZ10 product. The number 160 refers to the cast-resin body width dimension in millimetres, making this version more compact than the 185mm structure. It is suitable for compact switchgear, replacement projects and applications where the installation width, terminal position and mounting holes must match a smaller VT outline.
For international markets, the product page should not be limited to a domestic 10kV label. The JDZX11-10/160 / UNE10 series can be documented for 6kV, 6.6kV, 10kV, 11kV and 12kV class indoor systems when the highest voltage for equipment and insulation level are confirmed. This voltage wording is more suitable for India, Southeast Asia, the Middle East, Africa and IEC-oriented projects. For South America, where 13.2kV and 13.8kV systems are common, a higher voltage-class VT should be selected instead of using this 12kV-class model directly.
Product Type
| Item | Specification |
|---|---|
| Product name | Indoor Single-Phase Epoxy Cast-Resin Voltage Transformer |
| Model series | JDZX11-10/160 / JDZX11-6/160 / UNE10 |
| Structure | Single-phase, fully enclosed epoxy cast-resin insulation |
| Casting width | 160mm body-width reference for compact switchgear installation |
| Voltage class | 6kV, 6.6kV, 10kV, 11kV and 12kV class indoor systems |
| Rated frequency | 50Hz / 60Hz |
| Rated voltage ratio | 6/√3 : 0.1/√3 : 0.1/3; 10/√3 : 0.1/√3 : 0.1/3; 11/√3 : 0.11/√3 : 0.1/3 by project requirement |
| Accuracy class | 0.2 / 3P, 0.2 / 6P, 0.5 / 3P, 0.5 / 6P |
| Rated insulation level | 7.2/32/60kV for 6kV class; 12/42/75kV for 10kV, 11kV and 12kV class |
| Maximum output | 350VA reference |
| Typical use | Voltage measurement, metering reference, residual-voltage output and relay protection |
Product Display
Applications
- 6kV, 6.6kV, 10kV, 11kV and 12kV class indoor medium-voltage switchgear
- India 11kV distribution switchgear and industrial substations
- Southeast Asia 6.6kV, 11kV and 12kV IEC-oriented projects
- Middle East 11kV / 12kV switchgear and utility distribution panels
- South America projects where system voltage and insulation requirement are within 12kV equipment class
- Voltage measurement, metering reference, voltage monitoring and protection circuits
- Y / Y / open-delta systems using three single-phase VTs for residual-voltage detection
Features
- 160mm compact casting width: The 160mm structure helps reduce cabinet space and supports replacement in compact switchgear compartments.
- Single-phase phase-to-earth design: JDZX11 is normally selected for phase-to-earth measurement and residual-voltage protection schemes.
- Fully enclosed epoxy resin casting: The windings and core are protected by cast resin insulation, improving moisture resistance and mechanical strength.
- IEC export voltage coverage: The page covers 6kV, 6.6kV, 10kV, 11kV and 12kV class systems for India, Southeast Asia, South America and Middle East projects.
- Metering and protection accuracy: 0.2 and 0.5 metering classes can be combined with 3P or 6P protection / residual-voltage outputs.
- Clear terminal and grounding design: Primary, secondary and grounding points are clearly marked for safe installation and maintenance.
Service Conditions
- Installation location: indoor medium-voltage switchgear
- Rated frequency: 50Hz / 60Hz
- Ambient temperature: -25°C to +40°C
- Installation environment should be free from severe vibration, conductive dust, corrosive gas, explosive medium and heavy pollution.
- For India, Southeast Asia, South America and Middle East projects, high ambient temperature, humidity, altitude, dust and coastal conditions should be confirmed before ordering.
- For networks above 12kV equipment class, select a higher insulation-class voltage transformer.
Working Principle
The JDZX11-10/160 / UNE10 voltage transformer operates according to electromagnetic induction. The primary winding is connected between phase and earth in a medium-voltage system, and the secondary winding outputs a reduced standard voltage signal for instruments, meters, relays and control systems. The epoxy cast-resin insulation provides electrical isolation between the primary high-voltage side and the secondary low-voltage circuit.
In three-phase protection schemes, three single-phase JDZX11 units can be connected in a Y / Y / open-delta arrangement. The measurement secondary winding provides phase voltage signals, while the residual-voltage winding can be used for earth-fault detection. The final wiring scheme must be selected according to the system grounding mode, relay protection logic and approved terminal diagram.
Model Designation
| Code | Meaning |
|---|---|
| J | Voltage transformer / potential transformer |
| D | Single-phase structure |
| Z | Epoxy resin cast insulation |
| X | Phase-to-earth voltage transformer with residual-voltage function reference |
| 11 | Design sequence code for compact fully enclosed cast-resin structure |
| 10 | 10kV catalogue voltage reference; also documented for 11kV / 12kV class projects by insulation confirmation |
| 160 | Cast-resin body width dimension reference in millimetres |
| UNE10 | Equivalent or related model reference for the same compact indoor PT application |
Voltage Adaptation
The JDZX11-10/160 / UNE10 page should use IEC-oriented voltage language. The important point is to match the system voltage, highest voltage for equipment, rated insulation level and voltage ratio together. Do not use a 12kV-class VT for networks that require 15kV, 17.5kV or higher insulation class.
| Market / Region | Common MV System Voltage |
Recommended Page Voltage Class |
VT Selection Guidance |
|---|---|---|---|
| India | 6.6kV / 11kV | 6.6kV / 11kV / 12kV class | Use 12/42/75kV insulation level for 11kV systems where 12kV equipment class is specified. |
| Southeast Asia | 6.6kV / 11kV / 12kV | 6.6kV / 11kV / 12kV class | Suitable for IEC-style 12kV switchgear when ratio and insulation level are confirmed. |
| Middle East | 11kV / 12kV | 11kV / 12kV class | Use 11000/√3 or project-specified ratio with 12/42/75kV insulation level. |
| South America | 11.4kV / 13.2kV / 13.8kV in many networks | 12kV class only when system Um is within 12kV | For 13.2kV or 13.8kV networks, select a higher voltage-class VT such as 15kV / 17.5kV class. |
| Africa and other IEC markets | 6.6kV / 11kV / 12kV | 6.6kV / 11kV / 12kV class | Confirm voltage ratio, secondary voltage, insulation level and site conditions before ordering. |
Technical Data
| Item | Specification |
|---|---|
| Model series | JDZX11-6/160 / JDZX11-10/160 / UNE10 |
| Rated voltage class | 6kV, 6.6kV, 10kV, 11kV and 12kV class indoor systems |
| Rated insulation level | 7.2/32/60kV for 6kV class; 12/42/75kV for 10kV, 11kV and 12kV class |
| Rated frequency | 50Hz / 60Hz |
| Ambient temperature | -25°C to +40°C |
| Voltage transformer type | Indoor single-phase fully enclosed epoxy cast-resin inductive voltage transformer |
| Rated voltage ratio | 6/√3 : 0.1/√3 : 0.1/3; 10/√3 : 0.1/√3 : 0.1/3; 11/√3 : 0.11/√3 : 0.1/3 by agreement |
| Accuracy class | 0.2 / 3P, 0.2 / 6P, 0.5 / 3P, 0.5 / 6P |
| Rated output | 0.2/3P: 15/60VA; 0.2/6P: 15/60VA; 0.5/3P: 30/60VA; 0.5/6P: 30/60VA |
| Maximum output | 350VA reference |
| Applicable standards | IEC 61869-3, IEC 61869-1, IEC 60044-2, GB/T 20840.3-2013, GB/T 20840.1-2010 and project-specific requirements |
Selection Table
The following table adapts the catalogue data and extends the product selection logic for India, Southeast Asia, South America and Middle East projects.
| Model | Rated Voltage Ratio |
Rated Insulation Level |
Accuracy Class and Rated Output |
Maximum Output |
|---|---|---|---|---|
| JDZX11-6/160 | 6/√3 : 0.1/√3 : 0.1/3 6.3/√3 : 0.1/√3 : 0.1/3 6.6/√3 : 0.11/√3 : 0.11/3 by agreement |
7.2 / 32 / 60kV | 0.2 / 3P: 15 / 60VA 0.2 / 6P: 15 / 60VA 0.5 / 3P: 30 / 60VA 0.5 / 6P: 30 / 60VA |
350VA |
| JDZX11-10/160 UNE10 |
10/√3 : 0.1/√3 : 0.1/3 11/√3 : 0.11/√3 : 0.1/3 12/√3 : 0.11/√3 : 0.11/3 by agreement |
12 / 42 / 75kV | 0.2 / 3P: 15 / 60VA 0.2 / 6P: 15 / 60VA 0.5 / 3P: 30 / 60VA 0.5 / 6P: 30 / 60VA |
Note: 13.2kV, 13.8kV and 15kV systems normally require a higher equipment voltage class. Final voltage ratio, rated output and insulation level shall be confirmed by technical agreement.
Wiring Options
| Wiring Method | Configuration | Application Note |
|---|---|---|
| Phase-to-earth | Single JDZX unit connected between phase and earth | Used for phase voltage measurement and monitoring. |
| Y / Y / open-delta | Three JDZX units connected as a group | Used for three-phase phase-voltage measurement and residual-voltage output. |
| Residual-voltage output | da / dn secondary circuit | Used for earth-fault detection and zero-sequence voltage protection schemes. |
The JDZX11-10/160 / UNE10 voltage transformer normally includes a primary winding, a measurement secondary winding and a residual-voltage winding. Typical terminal marking includes A / N for the primary side, a / n for the measurement secondary output and da / dn for the residual-voltage output. The grounding bolt is located on the base or clamp and must be connected according to the project safety practice.
| Terminal | Function | Engineering Note |
|---|---|---|
| A / N | Primary phase-to-earth terminals | Connected between phase and earth according to the approved schematic. |
| a / n | Measurement secondary output | Connected to meters, monitoring devices, relays or control equipment. |
| da / dn | Residual-voltage output | Used for open-delta residual-voltage detection and earth-fault protection. |
| Grounding bolt | Protective grounding | Connected to the switchgear grounding system according to site practice. |
Standards and Compliance
The JDZX11-10/160 / UNE10 voltage transformer can be specified according to IEC 61869-3 for inductive voltage transformers and IEC 61869-1 for general instrument transformer requirements. Legacy documentation may also reference IEC 60044-2, GB/T 20840.3-2013 and GB/T 20840.1-2010. For export product pages, IEC 61869 wording is preferred, while GB and legacy references can be kept for factory design or replacement projects.
Installation and Dimensions
Dimensions
| Dimension Item | Reference Value | Engineering Note |
|---|---|---|
| Cast-resin body width | 160 ± 2mm | Key dimension for JDZX11-10/160 selection and replacement. |
| Overall length | 357 ± 2mm reference | Main length reference from outline drawing. |
| Body length | 290mm reference | Used for cabinet layout and replacement comparison. |
| Overall height | 251 ± 2mm reference | Confirm top terminal clearance before installation. |
| Mounting base length | 315mm reference | Used for mounting-hole and base-plate layout. |
| Weight | Approx. 23.5kg reference | Actual value depends on final ratio and configuration. |
Dimension data is for preliminary switchgear layout. Final dimensions are subject to the approved outline drawing.
The product is installed inside indoor switchgear using the lower mounting base. Before production, confirm the 160mm casting-width requirement, top terminal clearance, secondary terminal direction, grounding bolt position, mounting hole distance and residual-voltage wiring method. For replacement projects, compare the original VT width, height, base holes, secondary terminal direction and primary terminal position before selection.
Safety Notes
- Confirm voltage class, voltage ratio, insulation level, accuracy class and rated output before production.
- Confirm whether the system requires phase-to-earth measurement and residual-voltage output.
- Secondary circuits of voltage transformers shall not be short-circuited during operation.
- Secondary circuits should be protected by suitable fuses or miniature circuit breakers.
- Before maintenance, de-energize the primary circuit and follow lockout/tagout safety procedures.
- The grounding bolt should be connected according to the project electrical safety practice.
- Installation and commissioning shall be performed by qualified medium-voltage electrical personnel.