Product Overview

The JSJWF-10W voltage transformer is an outdoor oil-filled three-phase measurement device designed for 10kV medium-voltage distribution systems. This three-phase voltage transformer features advanced oil-immersed insulation technology, providing excellent dielectric strength and reliable operation in harsh outdoor environments.

The JSJWF-10W delivers precise three-phase voltage measurement for protection and metering applications with multiple accuracy classes (0.2, 0.5, 1.0) and flexible connection configurations (Y/△ three-winding or Y/Y/△ four-winding). The oil-immersed construction ensures superior thermal performance while providing 600VA maximum output capacity. Wide temperature range operation (-40°C to +40°C) makes it suitable for extreme climate conditions.

Product Display

JSJWF-10W Product Display
JSJWF-10W Product Display - Outdoor Oil-Filled Three-Phase Voltage Transformer
JSJWF-10W Product Display - Engineered for Reliability

Application Position

The JSJWF-10W is installed in outdoor switchgear, substations, and distribution networks where reliable three-phase voltage measurement is required. The oil-immersed insulation provides excellent dielectric strength and thermal dissipation for continuous outdoor operation. Multiple connection configurations (Y/△ or Y/Y/△) accommodate various protection and metering system requirements.

Main Applications

10kV outdoor distribution networks
Substations requiring three-phase voltage measurement
Industrial facilities with medium-voltage supply
Protection relay voltage input
Power quality monitoring and metering
Applications requiring high output capacity (up to 600VA)

Application Case Studies

Application Scenario 1: Substation Three-Phase Voltage Measurement
Utilities deploy the JSJWF-10W oil-filled voltage transformer in 10kV substations for protection relay input and energy metering. The Y/△ connection configuration provides both metering outputs (star-connected) and protection outputs (open delta), ensuring comprehensive three-phase system monitoring while the oil-immersed design delivers reliable performance in outdoor environments.

Application Scenario 2: Industrial Medium-Voltage Metering
Industrial facilities with 10kV incoming supply require accurate three-phase voltage measurement for power quality monitoring and protection coordination. The JSJWF-10W offers multiple accuracy classes (0.2, 0.5, 1.0) to meet different measurement requirements, with 600VA maximum output capacity for various burden conditions and the Y/Y/△ four-winding configuration for enhanced system flexibility.

Application Fit

Suitable For

Outdoor 10kV three-phase voltage measurement
Substations with protection relay requirements
Industrial facilities with medium-voltage supply
Power quality monitoring applications
Applications requiring high output capacity
Environments with extreme temperature variations

Not Recommended For

Indoor-only compact switchgear applications
Current measurement applications (use CT instead)
High-voltage systems above 12kV (use higher voltage class models)
Applications requiring maintenance-free dry-type design

Installation Conditions

Installation position: Outdoor switchgear, substations, or distribution points
Ambient temperature: -40°C to +40°C
Altitude: ≤ 1000m (standard), higher altitude available on request
Insulation: Oil-immersed
Frequency: 50Hz or 60Hz
Connection: Y/△ (three-winding) or Y/Y/△ (four-winding)
Maintenance: Periodic oil level and quality inspection recommended

Technical Parameters

The JSJWF-10W is an outdoor oil-filled three-phase voltage transformer for 10kV systems. Operating temperature -40°C to +40°C, compliant with GB20840.3-2013 and IEC61869-3:2011. Features oil-immersed insulation, multiple connection configurations, and high output capacity.

VT Data

Rated Voltage (kV)	Insulation Level (kV)	Accuracy Class & Rated Output (VA)	Max Output (VA)
10/√3 : 0.1/√3 : 0.1/3	12/42/75	0.2/3P: 3×30/100 0.5/3P: 3×80/100 1.0/3P: 3×150/100	600
10/√3 : 0.1/√3 : 0.1/√3 : 0.1/3	12/42/75	0.2/0.5/3P: 3×30/3×40/50 0.2/0.5/6P: 3×30/3×40/50	500

Installation

Dimension Reference

JSJWF-10W Installation Diagram

View	Key Dimensions	Application Note
Front View	Width 550±2mm / 565±2mm	Four bushings, nameplate, oil drain hole
Side View	Height 338±2mm; Width 280/295mm	Profile with primary bushing and lifting hook
Top View	520 x 605 x 335mm	Terminal layout and mounting holes

Weight: Approximately 142kg

Wiring Diagram

JSJWF-10W Wiring Diagram

Installation Guidelines

Install in outdoor switchgear or substation with adequate ventilation
Connect primary terminals A, B, C to three-phase system
Connect secondary terminals to meters and protection devices
Ensure proper grounding of secondary circuit neutral point
Verify voltage ratio matches system requirements before commissioning
Check oil level and insulation resistance before energizing
For Y/△ connection, connect tertiary winding in open delta for ground fault detection

Oil-Immersed Features

The JSJWF-10W incorporates advanced oil-immersed insulation technology including:

Excellent dielectric strength for high-voltage applications
Superior thermal dissipation for continuous operation
Wide temperature range operation (-40°C to +40°C)
Proven reliability in outdoor environments

Standards

The JSJWF-10W oil-filled voltage transformer complies with GB20840.3-2013 and IEC61869-3:2011 for voltage transformers, ensuring compatibility with Chinese and international standards for medium-voltage measurement applications.

Selection Guide

Select by system voltage: JSJWF-10W is designed for 10kV systems with 12/42/75kV insulation level.

Select by accuracy class: Use 0.2 for high-precision metering, 0.5 for standard metering, or 1.0 for general measurement.

Select by connection type: Choose Y/△ (three-winding) for basic applications or Y/Y/△ (four-winding) for enhanced system flexibility.

Select by rated output: Choose rated output based on connected burden requirements (up to 600VA maximum).

Ordering Information

When ordering the JSJWF-10W oil-filled voltage transformer, please specify:

Model: JSJWF-10W
System voltage: 10kV
Accuracy class: 0.2, 0.5, or 1.0
Rated output: Specify VA value from table
Connection type: Y/△ (three-winding) or Y/Y/△ (four-winding)
Frequency: 50Hz or 60Hz
Installation type: Outdoor
Quantity

FAQs

Three-phase oil-immersed voltage transformer uses transformer oil as insulation medium and measures all three phases simultaneously. This provides excellent dielectric strength and thermal dissipation for reliable three-phase voltage measurement in medium-voltage applications.

Y/△ connection has three windings (primary star, secondary star, tertiary open delta) for basic metering and protection. Y/Y/△ connection has four windings, providing additional secondary outputs for enhanced system flexibility and redundancy.

Three accuracy classes are available: 0.2 for high-precision metering, 0.5 for standard metering, and 1.0 for general measurement. Select based on your measurement accuracy requirements and connected burden.

Oil-immersed transformers require periodic oil level checks and oil quality inspection. The oil may need replacement after extended service. Regular maintenance ensures long-term reliability and accurate measurement performance.

The JSJWF-10W complies with GB20840.3-2013 and IEC61869-3:2011 for voltage transformers, ensuring compatibility with Chinese and international standards for medium-voltage measurement applications.

Confirm model (JSJWF-10W), system voltage (10kV), accuracy class (0.2, 0.5, or 1.0), rated output, connection type (Y/△ or Y/Y/△), frequency (50Hz or 60Hz), installation type (outdoor), and quantity.

JSJWF-10W Outdoor Oil-Filled Three-Phase Voltage Transformer