Transformer Tester

Your Professional Transformer Tester Supplier

Our goal is to become your reliable partner in the transformer tester in China. Wuhan Huaying Electric Power Tech & Science Co.,ltd, founded in 1997, engaged in the designing, manufacturing and selling of electrical test equipment. We are committed to applying advanced manufacturing technologies and strict quality control standards to every product. Our products are quality-assured, making us a dependable choice for long-term cooperation.

Why Choose Us

Our Certifications

We are ISO9001 quality system certified, and all products comply with international IEC standards or Chinese national standards.

Quality Control

Our company conducts insulation and withstand voltage tests on finished electrical products to ensure they meet safety standards.

Advanced Production Equipment

Our company has advanced production equipment, such as machine tools, voltage dividers, and winding machines.

Our Services

Free replacement for any quality problems within three months, free repair within one year, lifetime repair discounts, and free upgrades to the accompanying microcontroller software from the date of purchase.

Advantages of Transformer Tester

Reduced Downtime: Regular, fast, and accurate on-site testing prevents unexpected transformer failures, minimizing expensive, unplanned outages.

Predictive Maintenance: Early detection of potential faults (winding issues, insulation degradation) allows for planned maintenance, which saves on repair costs.

Optimized Operations: Testers enable determining efficiency, voltage regulation, and performance at any load without overloading the transformer.

Enhanced Safety and Reliability: Safety Assurance: Regular, comprehensive testing identifies risks, reducing the danger of fire or explosion, thus protecting personnel.

High Precision: Modern instruments use high-precision sensors to ensure accurate measurements of turn ratio, resistance, and insulation status.

Specification of Transformer Tester

Product name	Transformer tester
Voltage ratio and turns ratio measurement range	1-10000
Ratio measurement error	1-1000 error<0.2%, 1000-1000 error<0.5%
Vector group measurement	1-12
Phase angle measurement range	0-360 degree. Error <0.5 degree
Test voltage	AC 0-120V per phase. Maximum output current 200mA per phase.
Excitation current indication range	0-200mA. Error <1%

Features of Transformer Tester

Voltage ratio measurement of three-phase or single-phase power transformer. Voltage ratio measurement of three-phase or single-phase voltage transformer. Turns ratio measurement of three-phase or single-phase power transformer and voltage transformer.

Vector group test of three-phase power transformer. Tap position detection of three phase power transformer. Phase angle difference measurement of power transformer and voltage transformer. Micro printer integrated for test results print. USB interface for test results data upload.

Application of Transformer Tester

Factory Acceptance Testing (FAT): Confirms that new transformers meet specified design standards before leaving the manufacturer.

Commissioning Tests: Performed on-site after installation to verify the transformer is undamaged and connected correctly before going online.

Preventive & Predictive Maintenance: Routine testing—often annually or every 2-3 years—to monitor aging, identify insulation deterioration, and detect winding faults.

Diagnostic Troubleshooting: Used to pinpoint specific faults after a protection device trips, reducing downtime and identifying necessary repairs.

Core Testing ProceduresInsulation Resistance (IR) Test: Evaluates the insulation integrity (winding-to-ground or winding-to-winding) using high-voltage insulation testers.

Components of Transformer Tester

Signal Sources

Variable AC and DC power supplies to simulate operating conditions.

Measurement Instruments

Voltmeters, ammeters, and power analyzers (wattmeters) to measure voltage, current, resistance, power, and impedance.

Insulation & Safety Testing Units

Megohmmeters for insulation resistance, and often partial discharge testers or impulse winding testers.

Control/Automation Systems

Computers with specialized software to control the testing process and manage data.

Fixtures and Scanners

Test fixtures, scanning boards (often 20+ channels), and cables.

Optional Specialized Modules

Devices for testing transformer oil (dielectric strength) or specific ratios (TTR).

Other Service of Transformer Tester

Package	Wooden box
Shipping	Sea/Express
Payment	We accept T/T and L/C. For samples or small trial orders

FAQ

Q: What is the most important test for a transformer?

A: The excitation current measurement is often considered the most critical test, as it is highly sensitive to identifying core faults, turn faults in windings, and improper tap changer connections.

Q: How often should transformers be tested?

A: Routine testing is recommended, especially after commissioning, repairs, or if signs of degradation arise. Annual testing is generally suggested for critical equipment.

Q: What are the safety precautions when using a transformer tester?

A: Always test a de-energized (switched off) transformer.Ensure all safety protocols are followed, including earthing (grounding) secondary windings of Current Transformers (CTs) to avoid dangerous high voltages.

Q: How can I identify a bad transformer?

A: A bad transformer might show signs like no continuity, improper winding resistance, or a high-power factor, which indicates degraded insulation.

As one of the leading transformer tester manufacturers and suppliers in China, we specialized in providing high quality customized products. Please feel free to buy high-grade transformer tester in stock here from our factory.

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