Handheld Transformer Turns Ratio Tester | VS-6628S

Products Details

VS-6628S Handheld Transformer Turns Ratio Tester is a high-precision transformer diagnostic instrument developed according to IEC standards and power industry testing requirements. Transformer ratio testing is an essential procedure during transformer manufacturing, commissioning, preventive maintenance, and acceptance testing, helping identify winding short circuits, open circuits, incorrect connections, tap changer faults, and polarity issues. Designed to work smoothly alongside specialized Transformer Test Set configurations, the instrument adopts a full three-phase sine-wave inverter output with automatic voltage regulation technology, ensuring stable test signals and highly accurate measurement results. Built-in soft-start and soft-stop functions effectively protect both the instrument and the transformer under test.

Designed for maximum flexibility, the VS-6628S supports ratio and vector group testing for single-phase transformers, three-phase transformers, Z-type transformers, CTs, and PTs. The blind test function allows users to perform ratio and vector group measurements even when the transformer connection configuration is unknown.

The instrument automatically measures transformer turns ratio, ratio error, phase angle difference, vector group, excitation current, and polarity. The vector diagram is displayed directly on the screen, enabling technicians to quickly identify wiring configurations and transformer conditions.

A high-brightness 7-inch color touchscreen provides an intuitive user experience. Test records can be stored internally, exported to a USB drive in Word format, printed through the built-in printer, or transmitted via Bluetooth and RS232 communication interfaces for further analysis and reporting. Powered by a built-in rechargeable lithium battery, the VS-6628S is ideal for both field and laboratory applications, providing excellent portability without sacrificing performance.

System Specifications

Ratio Measurement
Parameter	Specification
Ratio Measurement Range	0.9 – 20,000
Measurement Type	Single Phase, Three Phase, Z-Type, CT, PT
Maximum Test Voltage	160VAC
Phase Angle Resolution	0.1°

 

Measurement Accuracy		Resolution
Ratio Range	Accuracy	Ratio Range	Resolution
≤500	±(Reading × 0.1% + 2 Digits)	0.9 – 9.9999	0.0001
500 – 3000	±(Reading × 0.2% + 2 Digits)	10 – 99.999	0.001
＞3000	±(Reading × 0.3% + 2 Digits)	100 – 999.99	0.01
		1000 – 9999.9	0.1
		≥10000	1

Display & Communication
Parameter	Specification
Display	7-inch Color Touch Screen
Communication	Bluetooth, RS232
Printer	Built-in Thermal Printer
Language	Chinese / English
USB Storage	Supported
Internal Memory	200 Test Records

 

Power Supply		Environmental Conditions
Parameter	Specification	Parameter	Specification
Battery Type	Rechargeable Lithium Battery	Operating Temperature	-10°C to +50°C
Charger Input	AC100V–240V	Relative Humidity	≤90% RH
Frequency	50Hz / 60Hz	Storage Condition	Non-Condensing Environment

 

Physical Specifications
Parameter	Specification
Dimensions	330 × 280 × 150 mm
Weight	4.7 kg

Features

• Handheld portable transformer turns ratio tester
• Full three-phase sine-wave inverter output
• Automatic voltage regulation technology
• Soft-start and soft-stop protection
• Blind ratio and vector group testing
• Single-phase transformer testing
• Three-phase transformer testing
• Z-type transformer testing
• CT ratio and polarity testing
• PT ratio and polarity testing
• Automatic vector group identification
• Automatic phase angle measurement
• Automatic polarity determination
• Vector diagram display
• Ratio measurement up to 20,000
• High-brightness 7-inch color touchscreen
• Bluetooth communication support
• RS232 communication interface
• Built-in thermal printer
• Internal and USB data storage
• Chinese and English language support
• Built-in rechargeable lithium battery

Applications & Use Cases

Application Scenarios

• Power Utilities: Routine transformer commissioning and maintenance testing.

• Transformer Manufacturers: Factory acceptance testing and quality control inspections.

• Substations: Verification of transformer ratios and vector groups during installation and maintenance.

• Industrial Power Systems: Preventive maintenance of power distribution transformers.

• Testing Laboratories: Accurate transformer diagnostics and certification testing.

Functional Applications

• Transformer Turns Ratio Testing

• Transformer Vector Group Testing

• Transformer Polarity Testing

• Transformer Phase Angle Measurement

• CT Ratio Testing

• CT Polarity Testing

• PT Ratio Testing

• PT Polarity Testing

• Z-Type Transformer Testing

• Factory Acceptance Testing (FAT)

• Substation Commissioning

• Preventive Maintenance Programs

Weshine Advantages

Weshine Electric specializes in transformer testing equipment and electrical diagnostic instruments. As a portable flagship transformer turns ratio tester, the VS-6628S Handheld Transformer Turns Ratio Tester combines high-precision measurement technology, intelligent automation, portable design, and advanced communication capabilities to deliver reliable transformer testing solutions for utilities, manufacturers, service providers, and testing laboratories worldwide.