Overview
The JSZY16-24R is an indoor three-phase epoxy resin cast voltage transformer rated for 20kV medium-voltage distribution systems. It employs rib plug type epoxy resin cast insulation, delivering high dielectric strength and maintenance-free operation in enclosed environments.
This transformer supports multiple accuracy classes (0.2, 0.5, 3P) and winding configurations (Y/△ three-winding or Y/Y/△ four-winding), making it suitable for energy metering, voltage monitoring, and relay protection applications. Compliant with relevant IEC standards, it offers up to 1000VA output capacity and features a compact design weighing 135kg for simplified installation.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 20kV |
| Maximum System Voltage | 24kV |
| Insulation Level | 24/65/125kV |
| Accuracy Classes | 0.2, 0.5, 3P |
| Winding Configurations | Y/△ (3-winding), Y/Y/△ (4-winding) |
| Max Output Capacity | 1000VA |
| Phase Configuration | Three-phase |
| Installation Type | Indoor |
| Insulation Material | Epoxy resin cast |
| Weight | 135kg |
Construction
The JSZY16-24R features a robust epoxy resin cast-resin structure with rib plug type terminals, ensuring excellent mechanical strength and electrical insulation. The core and windings are fully encapsulated in epoxy resin under vacuum conditions, eliminating air voids and providing superior resistance to moisture, dust, and partial discharge. This solid insulation design enables maintenance-free operation throughout its service life. The compact housing includes integrated mounting brackets and clearly labeled terminal blocks for safe and straightforward connection in indoor switchgear assemblies.
Technical Parameters
Service Conditions
- Installation position: Indoor switchgear, substations, or distribution points
- Ambient temperature: -25°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Y/△ (three-winding) or Y/Y/△ (four-winding)
- Maintenance: Minimal maintenance required (epoxy resin design)
| YTYPE | Rated Voltage (kV) | Rated insulation (kV) | Accuracy class and Rated output (VA) | Max. output (VA) |
|---|---|---|---|---|
| JSZY16-24R | 20/√3 : 0.1/√3 : 0.1/3 | 24/65/125 | 0.2/3P—3*30/100 | 800 |
| 0.2/6P—3*30/100 | ||||
| 20/√3 : 0.1/√3 : 0.22/√3 : 0.1/3 | 0.5/3P—3*100/100 | 1000 | ||
| 0.5/6P—3*100/100 | ||||
| 0.2/3.0/3P-3*25/3*500/100 0.5/3.0/6P-3*80/3*500/100 |
Installation & Wiring
Installation Diagram
The JSZY16-24R is designed for indoor installation in switchgear or substations with adequate ventilation. Mount the unit using the base dimensions (inner 330mm, overall 427mm) and secure it through the mounting holes spaced at 164+164mm. Ensure sufficient clearance around the unit for safe access to terminals A, B, C, and the terminal block.
Wiring Diagram
Connect primary terminals A, B, and C to the three-phase system. The neutral terminal N must be connected to system ground. Secondary terminals supply voltage signals to meters and protection devices. For ground fault detection, the tertiary winding should be wired in an open delta configuration as shown in the diagram. Always verify that the voltage ratio matches system requirements before commissioning.
Selection & FAQs
Selection Guide
- Select for 20kV system voltage with 24/65/125kV insulation level.
- Choose Y/△ (three-winding) for basic metering and protection or Y/Y/△ (four-winding) for added flexibility and redundancy.
- Pick accuracy class 0.2 for high-precision metering, 0.5 for standard metering, or 3P for protection applications.
- Determine rated output based on connected burden requirements, up to a maximum of 1000VA.
- Specify operating frequency as either 50Hz or 60Hz during ordering.
- Confirm indoor installation type, as the JSZY16-24R is designed exclusively for indoor use.
Frequently Asked Questions
Q1: Can this indoor voltage transformer be installed outdoors?
No, the JSZY16-24R is strictly designed for indoor switchgear and substations. It operates safely in ambient temperatures ranging from -25°C to +40°C. Please contact us for outdoor-rated alternatives.
Q2: Which accuracy class is suitable for protective relaying?
Select the 3P or 6P accuracy class for protection applications. These classes ensure reliable performance during fault conditions with rated outputs up to 100 VA. Confirm specific relay burdens with our engineering team.
Q3: What winding configurations are available for this three-phase transformer?
It features either Y/△ (three-winding) or Y/Y/△ (four-winding) connections. The epoxy resin cast insulation provides a rated insulation level of 24/65/125 kV. Specify your required connection type during inquiry.
Q4: Can the altitude rating be customized for high-elevation projects?
Yes, the standard altitude limit is ≤1000m, but higher altitude designs are available upon request. We will adjust the insulation and cooling parameters accordingly. Submit your exact site elevation for factory evaluation.
Q5: What factory tests are performed before shipment?
Standard routine tests including ratio, polarity, and insulation resistance are conducted per IEC standards. Specific type tests or third-party certifications are subject to confirmation. Contact our sales team for the detailed test report template.
Q6: Where is this 24kV epoxy resin transformer typically applied?
It is primarily used in indoor switchgear, substations, and distribution points for voltage measurement and protection. The 50Hz/60Hz frequency supports standard grid operations. Check our product catalog for similar medium-voltage instrument transformers.
Q7: How do I select the correct rated output VA?
Match the VA rating to your connected meter and relay burdens, choosing between 800 VA and 1000 VA maximum outputs. Note that rated output and accuracy class are mutually exclusive alternatives. Consult our technical support for burden calculations.