Overview
The JDZX11-10/160 / UNE10 is a single-phase, indoor epoxy cast-resin voltage transformer designed for phase-to-earth connection in 6kV to 12kV class AC systems operating at 50Hz or 60Hz. It features fully enclosed epoxy resin insulation, providing high dielectric strength, moisture resistance, and mechanical durability for indoor switchgear environments.
This voltage transformer supports combined metering and protection functions with accuracy classes of 0.2 or 0.5 for measurement and 3P or 6P for residual-voltage and protection applications. It is suitable for voltage measurement, energy metering reference, relay protection, and earth-fault detection in Y/Y/open-delta configurations, complying with IEC standards for use in India, Southeast Asia, the Middle East, Africa, and other international markets.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Voltage class | 6kV, 6.6kV, 10kV, 11kV, 12kV |
| Rated frequency | 50Hz / 60Hz |
| Insulation level (10–12kV class) | 12/42/75kV |
| Insulation level (6kV class) | 7.2/32/60kV |
| Rated voltage ratio | 10/√3 : 0.1/√3 : 0.1/3 (typical); others by requirement |
| Accuracy class | 0.2 / 3P, 0.2 / 6P, 0.5 / 3P, 0.5 / 6P |
| Maximum output | 350VA |
| Primary connection | Phase-to-earth |
| Secondary windings | Measurement + residual-voltage (open-delta) |
| Construction | Epoxy cast-resin, fully enclosed |
| Application | Metering, protection, voltage monitoring, earth-fault detection |
| Indoor use | Yes, in MV switchgear |
Model Designation
- J: Voltage transformer / potential transformer
- D: Single-phase structure
- Z: Epoxy resin cast insulation
- X: Phase-to-earth type with residual-voltage function reference
- 11: Design sequence code for compact fully enclosed cast-resin structure
- 10: 10kV catalogue voltage reference; also applicable to 11kV/12kV class with confirmed insulation
- 160: Cast-resin body width dimension in millimetres
- UNE10: Equivalent model reference for compact indoor PT applications
Construction
The JDZX11-10/160 / UNE10 features a monolithic, fully enclosed epoxy cast-resin construction that encapsulates both the magnetic core and windings. This solid insulation system eliminates air gaps, enhances partial discharge performance, and provides excellent resistance to humidity, dust, and chemical corrosion. The primary and secondary terminals are integrally cast into the resin body with clear markings for safe and reliable connection. A dedicated grounding terminal is provided on the base flange for equipment grounding. The compact 160mm body width allows installation in space-constrained switchgear compartments while maintaining compliance with standard creepage and clearance distances for its rated insulation level.
Technical Parameters
Service Conditions
- Ambient temperature: -25°C to +40°C
- Installation environment: Indoor
Technical Parameters
The JDZX11-10/160 / UNE10 is an indoor single-phase fully enclosed epoxy cast-resin inductive voltage transformer designed for 6kV to 12kV class systems. It operates within an ambient temperature range of -25°C to +40°C, complies with IEC 61869-3, IEC 61869-1, GB/T 20840.3-2013 and other relevant standards, and supports rated outputs up to 60VA per accuracy class with a maximum output reference of 350VA.
| Type | Voltage Ratio(kV) |
Rated insulation (kV) |
Accuracy class / Rated output (VA) |
Max. output (VA) |
|---|---|---|---|---|
| JDZX10-6/160 | 6/√3 : 0.1/√3 : 0.1/3 | 7.2/32/60 | 0.2/3P—15/60 0.2/6P—15/60 |
350 |
| 6.3/√3 : 0.1/√3 : 0.1/3 | 0.5/3P—30/60 0.5/6P—30/60 |
|||
| JDZX10-10/160 | 10/√3 : 0.1/√3 : 0.1/3 | 12/42/75 | 0.2/3P—15/60 0.2/6P—15/60 |
350 |
| 11/√3 : 0.11/√3 : 0.1/3 | 0.5/3P—30/60 0.5/6P—30/60 |
Installation & Wiring
Installation Diagram
The JDZX11-10/160 / UNE10 voltage transformer is installed inside indoor switchgear using the lower mounting base. Ensure adequate clearance for the top primary terminal and verify alignment of mounting holes with the base plate. Confirm secondary terminal direction, grounding bolt position, and residual-voltage wiring method prior to installation.
Wiring Diagram
The wiring diagram shows standard terminal markings for phase-to-earth measurement and optional residual-voltage output. Primary terminal (P1) connects to the high-voltage busbar. Secondary terminals include a1-n1 for main metering/protection (e.g., 100/√3 V) and da-dn for residual voltage (e.g., 100/3 V). Terminal n1 and dn are internally connected to the grounding point. Wiring must follow project-specific requirements for accuracy class, rated output, and system configuration.
Selection & FAQs
Selection Guide
- Select the phase-to-earth ratio from the actual system voltage. Confirm 6/√3, 6.3/√3, 6.6/√3, 10/√3, 11/√3 or 12/√3 primary and the required 100V/110V secondary values.
- Choose metering and protection outputs separately. Specify 0.2 at 15VA or 0.5 at 30VA, plus a 3P or 6P residual winding at 60VA.
- Specify rated voltage factor and duration. This essential phase-to-earth PT parameter is missing and must match the system neutral grounding and earth-fault clearing time.
- Do not treat 350VA as an accuracy burden. It is a maximum thermal-output reference, not the load at which 0.2/0.5 or 3P/6P performance is guaranteed.
- Approve grounding and compact installation. Confirm 160mm body, base, clearances, A/N-a/n-da/dn diagram, any internal n/dn grounding, fuses and terminal access.
Frequently Asked Questions
Q1: Which accuracy class is suitable for protective relaying?
Select the 3P or 6P accuracy class for protection applications. These classes support rated outputs of 60VA per the technical table. Verify your specific relay burden with our engineering team.
Q2: Can this voltage transformer be installed outdoors?
No, this is strictly an indoor epoxy cast-resin unit. It operates within an ambient temperature range of -25°C to +40°C. Ensure your switchgear provides adequate indoor environmental protection.
Q3: What is the maximum system voltage for this model?
It is designed for 6kV to 12kV class systems. The JDZX11-10/160 model features a rated insulation level of 12/42/75kV. Confirm your exact system voltage during the inquiry stage.
Q4: Which international standards does this transformer comply with?
It fully complies with IEC 61869-3 and IEC 61869-1 standards. It also meets the Chinese GB/T 20840.3-2013 standard. Request the specific type test certificates for your project documentation.
Q5: Are special voltage ratios available for custom projects?
Standard ratios include 10/√3 and 11/√3 for primary windings. Custom voltage ratios are subject to factory confirmation based on your single-line diagram. Contact our sales team with your exact requirements.
Q6: What type of switchgear is this voltage transformer used in?
This single-phase inductive voltage transformer is used in indoor medium-voltage switchgear and power distribution panels. It is ideal for 6kV to 12kV indoor electrical substations.
Q7: How much maximum burden can the secondary winding handle?
The maximum output reference is 350VA. For standard accuracy classes, the rated output is up to 60VA. Please provide your connected meter and relay burden list for precise sizing.