Transformer Testing Instrument
A manufacturer specializing in Transformer Testing Instrument for 20 years, A reliable supplier in China, Offering Factory-Direct Pricing.
Our company has specialized in the production and manufacturing of high-voltage testing equipment for 20 years, with a modern intelligent factory covering an area of over 10000 square meters, staffed by 51 professional technicians, and hold CE certification. 35 patents, 10+ software copyrights，Currently, we have over 150 stable distributors worldwide and established more than 10 service offices overseas.
Transformer test equipment is a category of electrical testing instruments specifically designed to inspect, verify, and evaluate the performance, safety, and reliability of transformers.The transformer primarily consists of high-precision voltage and current sources, high-precision ADCs (analog-to-digital converters), embedded processors, memory chips, touchscreens, relays, contactors, overvoltage protectors, and other components.
Why Choose Us
Wuhan Goldhome Hipot Electrical Co., Ltd. was established in 2008, located in Economic and Technical Development Zone, working area more than 10000 square meters.We are professional OEM, ODM, OBM Manufacturer which is engaged in the research, development, sale and service of High Voltage Testing Equipment including: Resonant Test System, High Voltage Tester, Transformer Tester, Primary Current Injection Tester, Circuit Beaker Tester, Relay Protection Tester, Cable Tester, SF6 Test Analyzer, Oil Testing Instruments, etc.
Product Applications
These solutions are widely applied across power engineering, transportation, power plant construction, railway infrastructure, petrochemical, metallurgical, and coal mining industries.
Sales Markets
Cumulative exports have reached Indonesia, India, Pakistan, Vietnam, the Philippines, Saudi Arabia, the United Arab Emirates, Egypt, Turkey, Israel, Brazil, Germany, the United States, Australia, and other countries and regions. With over 150 distributors worldwide and more than 10 overseas service offices, we have successfully opened up global markets.
Honors, Patents, Certificates
Our products have passed inspections by national and provincial energy authorities and obtained CE certification. Additionally, the company has secured ISO 9001:2015 Quality Management System, ISO 14001:2018 Occupational Health and Safety Management System, ISO 14001:2015 Environmental Management System, and SGS certifications. We have been honored with titles such as National High-Tech Enterprise. We hold over 20 patented technologies, including utility model patents for variable-frequency series resonant test equipment.
Our Service
We pledge to treat every client with integrity and equality, regardless of contract size or whether they are domestic or international, new or existing customers, providing professional consultation and advice. Goldhome provides professional installation, commissioning and training for users' workers, ensures that users can get familiar with operation methods and put machines into use as soon as possible.
Measuring Type of Transformer Testing Instrument
Insulation Resistance Measurement
Detects defects such as deterioration, moisture ingress, or contamination in insulation materials to prevent accidents like leakage, short circuits, electric shock, or fire.
Winding Resistance Test
Verifies the quality of conductor connections, weld points, and tap changer contacts, while detecting interturn short circuits.
Turns Ratio Test
Validates the accuracy of the transformer winding turns ratio/voltage ratio.
Frame Deformation Analysis (FRA) Test
Primarily diagnoses whether windings have undergone mechanical deformation (such as displacement, distortion, or bulging) after transportation or short-circuit current impact.
Partial Discharge (PD) Testing
Used to detect and evaluate minute, localized discharge phenomena within insulating media. Prevents severe accidents like power outages, equipment damage, or even explosions caused by insulation breakdown.
Short-Circuit Testing
Simulates the most severe short-circuit faults to ensure equipment can safely and reliably interrupt fault currents, protecting the entire power system.
Polarity Testing
Verifies whether the internal winding direction (winding relationship) and external terminal markings of winding-equipped devices like transformers and instrument transformers (CTs, PTs) correspond correctly.
Load Testing
Load testing primarily evaluates power generation and supply equipment (e.g., generators, UPS, transformers, batteries) to validate performance and reliability under actual load conditions.
Tap Changer Test
Analyzes dynamic resistance waveforms and switching times during operation to diagnose mechanical and electrical faults such as contact erosion or mechanism sticking.
Impedance Testing
It measures the total resistance of a circuit or component to alternating current (AC), rather than merely its direct current resistance. This reveals how circuit components respond to variations in voltage frequency and phase.
Features of Transformer Testing Instruments
Integrated Multi-Parameter Testing: Covers key parameters (turn ratio, DC resistance, insulation, withstand voltage) in one device, no frequent instrument/connection changes.
High Voltage/Currrent Adaptability: Handles high voltage (up to hundreds of kV) and large current (up to hundreds of A) to match transformers’ actual operating conditions.
Precise Fault Diagnosis: Locates hidden issues (winding deformation, core grounding faults, oil deterioration) via specialized algorithms (e.g., frequency response analysis, DGA ratio method).
Smart Automation: Auto-switches test gears, collects data, calculates results, and analyzes faults; reduces manual errors and operational complexity.
Field & Safety Compatibility: Portable models suit on-site use (substations/factories); built-in shielding and current-limiting protection meet IEC safety standards.
Portable and benchtop models: Transformer testers are available in portable and benchtop models to suit different environments and testing applications. Portable models are convenient for outdoor use, while bench models offer greater accuracy and functionality for laboratory or industrial testing.
Data analysis and display reading: Many transformer testers have data logging functions that allow test results to be recorded and stored. Transformer testers are often equipped with digital displays that make it easy to read test results and may have user-friendly interfaces for intuitive operation.
The Type of Transformer Tester
1.HM5001 Transformer Turns Ratio Tester
TRANSFORMER TURN RATIO TESTER is applied to measure the voltage ratio of three or single phase transformer. All the data and test results are showed on a 320*240 LCD. All the test results could be printed by the micro printer or saved on the storage of the tester. The tester has a good performance on auto protection and anti-disturb.
2.HM5002 Transformer DC Resistance Tester
Transformer DC resistance is transformer manufacturing of semi-finished products, finished products testing, installation, commissioning test and power sector preventive test will measure project, can effectively find the transformer coil material selection, welding, loose connection parts, short, break the blemish such as manufacturing and running after the existence of hidden dangers.In order to meet the needs of transformer dc resistance rapid measurement, it has developed a new generation of CT series dc resistance tester.
3.HM5006 Transformer Tan Delta Dielectric Loss Tester
HM5006 Transformer Dielectric Loss Tester is a high-precision instrument, which can be applied to automatically measure electrical loss tangent and capacitance of all kinds of high voltage electrical equipments on the spot of power plants, substations,laboratory, etc.
4.HM5003 Transformer Capacity&Loss Tester
HM5003 uses color large screen LCD display, simple and quick menu type operation, man-machine interface is friendly. The instrument comes with a high efficiency rechargeable battery, which can work without external power supply. The battery is fully charged at one time and can continuously measure more than 100 sets of transformers.
5.HM5010 Sweep Frequency Response Analyzer
This transformer winding deformation tester is specially used for measuring winding characteristic parameters in transformer.The internal fault frequency response analysis (FRA) method is used to accurately judge the internal fault of the transformer.
6.HM5050 Transformer Comprehensive Test Bench
HM5050 automatic transformer comprehensive test system is a high-precision intelligent test equipment specially designed for power transformer production, testing and scientific research units. The system integrates no-load loss, load loss, temperature rise test, power frequency withstand voltage and induced voltage test functions, supports automatic operation and data management.It’s suitable for factory testing of oil-immersed, dry-type, amorphous alloy and other types of transformer.
Transformer test benches typically consist of several major components: the power supply system, control system, measurement system, and test load. High-Power Supply System, Dedicated Instrument Cluster, Central Control System.
A fully functional integrated test bench is capable of performing the following tests:
- Insulation Resistance Test
- TransformerTan Delta Test / Power Factor Test
- Transforemr AC Withstand Voltage Test
- Induced Withstand Voltage Test
- Partial Discharge Test
- Transformer Winding Resistance Test
- Transformer Turns Ratio Test
- Short-Circuit Impedance Test
- Transformer Frequency Withstand Voltage Test
- Transformer No-load/Load Performance Test
- Temperature Rise Test
- On-Load Tap-Changer Test
- Transformer Oil Test
- Sound Level Test
Precautions and Maintenance of Transformer Tester
Maintenance
1. Power off, discharge, verify and ground before maintenance. Live maintenance is strictly prohibited.
2. Use original or certified accessories and consumables, and strictly prohibit the use of damaged cables and accessories.
3. Establish detailed maintenance logs, record each operation, and strictly prohibit non professionals from disassembling the core modules of the instrument.
4. Maintain a constant temperature, humidity, and dust-free laboratory environment. It is strictly prohibited to continue using it for formal testing and report issuance after the calibration has expired.
5. Immediately stop using and label the product upon discovering any issues, and contact professional personnel. It is strictly prohibited to forcefully pull cables or engage in rough handling.
Precautions
1. Carefully read this manual before using the instrument.
2. Operators should possess general electrical knowledge.
3. Avoid using the instrument in locations exposed to rain, corrosive gases, excessive dust, high temperatures, or direct sunlight.
4. Protect the instrument from severe vibration.
5. After testing, wait until the discharge alarm stops before turning off the power and disconnecting the test leads.
6. When measuring no-load tap-changing transformers, wait until the discharge indicator alarm stops before switching tap positions.
7. Do not move the test clamps or power supply lines during testing.
Our Advantages
Wuhan Goldhome Hipot Electrical CO., LTD. is a well-known High Voltage Tester supplier, And we specialize in the production variety of different transformer Tester including:
HM5001 Transformer Turns Ratio Tester
HM5002 Transformer DC Resistance Tester
HM5006 Transformer Tan Delta Dielectric Loss Tester
HM5003 Transformer Capacity&Loss Tester
HM5010 Sweep Frequency Response Analyzer
HM5050 Transformer Comprehensive Test Bench
- Professional Consultation – Respond technical enquiries within one hours;
- Detailed Documentation – Dispatch requested technical materials within one hour;
- Competitive Quotation – Provide a reasonable quotation within two hours.
- Certificated By CE, lSO9001,SGS, BV,TUV.
- Trust And RecognitionFrom 180 Countries And Regions
- High-Level Professional Factory With Over 45.000 m
- Product demonstration videos
- Strict contract requirements
- Timely production progress updates synchronization
- On-time delivery
- 12-month warranty
- Overseas training support
- Regular follow-ups by professionals
- Extended warranty (optional)
- Factory testing available
- CE certification
- 35 patents
- 10+ software copyrights
- Customization available
- Professional after-sales Team
- Product Innovation
- Quality Control
- Authorized calibration (optional)
- Authorized as a National-Level “High-Tech Enterprise”
- Wuhan Technology Innovation "Gazelle" Enterprise.
FAQ
Q: What are the primary testing functions of a transformer tester?
A: Winding DC resistance, voltage ratio (turns ratio), insulation resistance, dielectric loss (Tanδ), no-load/load losses. High-end models also integrate partial discharge (PD), winding deformation (FRA), and on-load tap changer (OLTC) testing.
Q: How to choose between portable and bench-top/integrated testers?
A: Portable: Ideal for field inspections and preventive testing. Lightweight, portable, and highly integrated.
Bench-top/Integrated: Suited for laboratories, factory acceptance testing, and R&D. Offers higher precision, specialized functions, and strong expandability.
Q: How to select the tester's output voltage/current capacity?
A: Select based on the capacity and voltage rating of the transformer under test. Transformers with higher capacity and voltage ratings require testers with greater output current and capacity.
Q: What safety preparations are required before testing?
A: Essential steps: Power off, verify absence of voltage, discharge, and install grounding wires. Set up safety barriers. Operators must wear insulated gloves and insulated shoes.
Q: Why is DC resistance testing so slow? How can it be accelerated?
A: Large transformers have high inductance, requiring time for current stabilization. Utilize the instrument's “magnetic assist” function.
Q: What should be done if the turns ratio test fails?
A: First verify the tap changer position. If the tap is correct, it may indicate interturn short circuits, winding turn errors, or connection faults requiring further inspection.
Q: Why is the dielectric loss (Tanδ) test result critical?
A: Tanδ provides highly sensitive indicators of overall insulation aging, moisture ingress, and degradation trends, serving as a key metric for assessing insulation health.
Q: What should be done if test data fluctuates significantly?
A: Primary causes: poor wiring connections, unreliable grounding, or electromagnetic interference at the site.
Solution: Clean and tighten all terminals, ensure reliable grounding at one point, and move away from interference sources.
Q: Does the test environment (temperature/humidity) affect results?
A: Significantly! Especially for insulation tests (e.g., insulation resistance, dielectric loss). Higher temperatures and humidity cause insulation resistance to decrease markedly.
Q: What if the instrument won't power on or frequently freezes?
A: First check power connections and fuses. If the issue persists, do not disassemble the unit yourself. Contact the manufacturer's technical support. It may indicate an internal power supply or software malfunction.
As one of the most professional transformer testing instrument manufacturers in China, we're featured by quality products and good price. Welcome to buy transformer testing instrument in stock here and get pricelist from our factory. Contact us for customized service.
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