Table of Contents

Overview of Three-Channel DC Resistance Tester

The DC resistance test of transformers is a mandatory item for semi-finished and finished factory tests, installation & handover tests, and power preventive maintenance tests. It effectively detects manufacturing defects such as improper coil material selection, poor welding, loose connections, strand loss and broken wires, as well as hidden operational faults.

To meet the demand for rapid transformer DC resistance measurement, our company developed a new generation of DC resistance testers relying on our technical strengths. Adopting innovative power supply technology, the instrument features compact size, light weight and large output current.
It integrates automatic discharge and audible discharge alarm functions. With high measurement accuracy and simple operation, it realizes fast DC resistance testing for transformers.

Functional Features of Three-Channel DC Resistance Tester

Integrated all-in-one design, small size and light weight for easy transportation.
Suitable for DC resistance measurement of main transformers and distribution transformers below 110kV, as well as inductive samples including current/voltage transformers and motors.
Multiple measurement modes: single-phase, phase-by-phase three-phase Y connection, phase-by-phase three-phase delta connection. Only two wiring sets (one for HV side, one for LV side) are required; repeated rewiring is unnecessary to complete three-phase winding testing.
Controlled by high-speed chips, the machine delivers high automation and user-friendly operation.
Adopts cutting-edge power supply technology with built-in lithium battery. Multiple current gears and high output voltage enable fast magnetization to save testing time. Max output current reaches 10A, max output voltage 20V, measuring range covers 1mΩ ~ 20kΩ.
Automatically judges magnetization completion, locks resistance readings and supports data storage without manual judgment.
Supports uninterrupted continuous measurement for transformers requiring current gear switching.
Auto-test function automatically selects the optimal current gear based on test loads.
Comprehensive protection functions reliably shield the instrument from back EMF impact.
Voice broadcast function automatically announces resistance values once testing finishes.
Fast discharge function quickly releases and recovers winding residual energy after measurement.
Backlit LCD screen ensures clear visibility under direct sunlight.
Built-in power-off storage saves up to 100 groups of historical test data for instant review.
Equipped with BLE4.0 Bluetooth interface for data transmission; WeChat mini-program access is optional.
Large-capacity built-in lithium battery eliminates external power supply requirements, ideal for outdoor mobile field work.

Technical Specifications of Three-Channel DC Resistance Tester

Measuring Range & Current Gears

Output Current	Resistance Measuring Range
10A	1mΩ ~ 0.5Ω
5A	10mΩ ~ 2Ω
2A	10mΩ ~ 10Ω
1A	10mΩ ~ 20Ω
100mA	1Ω ~ 200Ω
10mA	10Ω ~ 2kΩ
1mA	100Ω ~ 20kΩ

Item	Parameter
Test Accuracy	±(0.2% of reading + 3 digits)
Minimum Resolution	0.1 μΩ
Test Duration	Max 15 min for single-phase test; Max 45 min for three-phase phase-by-phase test
Measuring Cycles	≥100 cycles (tested under 10A discharge mode with 100mΩ load, continuous operation for 5 minutes per cycle)
Data Storage	Stores up to 100 groups of historical test records
Rated Power	Max 80W for single-phase mode; Max 100W for three-phase mode
Maximum Output Voltage	20V (valid when output current is less than 1A)
Adjustable DC Output Current	1mA / 10mA / 100mA / Auto / 1A / 2A / 5A / 10A
Battery Capacity	5Ah
Display Type	Backlit segment LCD screen
Protection Functions	Overcurrent & short-circuit protection; battery over-discharge protection; overheat protection for battery and power components

Additional Functions

One-key automatic measurement, auto-judgment of stable resistance values
Supports phase-by-phase measurement for Y-connected and delta-connected transformer windings
Auto range switching: automatically match optimal current gear
Uninterrupted continuous measurement for transformers requiring multiple gear shifts
Energy recovery: recycle residual energy from transformer windings back to battery after testing
Voice broadcast: automatically announce resistance readings upon test completion
Bluetooth data transmission: compliant with BLE4.0 protocol, compatible with optional WeChat mini-program

Physical Parameters

Item	Size & Weight
Overall Dimensions	L310mm × W288mm × H168mm
Main Unit Weight	4.5kg (excluding test leads)

Applications of Three-Channel DC Resistance Tester

This Three-Channel DC Resistance Tester is designed for three-phase transformer winding resistance testing, detects loose joints, broken strands and welding defects. It applies to power station handover tests, factory inspection, new energy transformer maintenance and CT, motor resistance measurement.

Our Advantages

Our Three-Channel DC Resistance Tester adopts integrated all-in-one structure with built-in large-capacity lithium battery, supporting simultaneous three-phase measurement without repeated wiring. It features auto current selection, winding energy recovery, voice broadcast and BLE 4.0 Bluetooth transmission, with complete multi-protection circuits for stable outdoor field testing.

FAQ for Three Channel Transformer DC Resistance Tester

Q1: What equipment can this Three Channel Transformer DC Resistance Tester test?

A: It measures three-phase windings of main transformers and distribution transformers below 110kV, and also applies to inductive samples including CT, PT, reactors and industrial motors. It can detect broken strands, loose connections and poor welding defects of coils.

Q2: What test scenarios is this instrument suitable for?

A: Transformer factory delivery inspection, substation installation handover test, annual preventive maintenance, new energy wind/PV box transformer detection, and outdoor power equipment overhaul.

Q3: Do I need to rewire repeatedly to test transformer three-phase windings?

A: No. Only two wiring groups (one for high voltage side, one for low voltage side) are required. It supports single-phase, phase-by-phase Y and delta connection modes to finish full three-phase measurement without repeated wire changes.

Q4: Can it test transformers with OLTC (on-load tap changer)?

A: Yes. It supports uninterrupted continuous measurement, you can shift tap gears and carry out multiple tests without shutting down the device.

Q5: What current gears and measuring range does it have?

A: Adjustable DC current: 1mA/10mA/100mA/Auto/1A/2A/5A/10A. The full measuring range covers 1mΩ ~ 20kΩ, max output voltage reaches 20V.

Q6: What is the measurement accuracy and resolution?

A: Test accuracy: ±(0.2% of reading + 3 digits); minimum resolution up to 0.1μΩ to guarantee precise test data.

Q7: How long will a single test take?

A: Max 15 minutes for single-phase test, max 45 minutes for three-phase phase-by-phase measurement. It features fast magnetization to greatly shorten testing time.

Q8: Can it work outdoors without external mains power?

A: Yes. Built-in 5Ah large-capacity lithium battery supports mobile field operation, no extra AC power supply needed.

Q9: What are the dimension and weight of the host?

A: Overall size: 310mm(L)*288mm(W)*168mm(H); main unit weight 4.5kg (excluding test leads), integrated compact design for easy transport.

Q10: Does it have data storage and export functions?

A: It can store up to 100 groups of historical test data with power-off storage function. Equipped with BLE4.0 Bluetooth for data transmission, matching optional WeChat mini-program.

Q11: What is the energy recovery function for?

A: After testing, it recycles residual energy from transformer windings back to the built-in battery, realizes fast safe discharge and avoids electric shock hazards.

Q12: Is the screen visible under strong sunlight?

A: It adopts backlit segment LCD screen, with clear display under outdoor strong sunlight.

Reviews

There are no reviews yet.

Be the first to review “HF-TC-606 Three Channel Transformer DC Resistance Tester”

Leave your message

HF-TC-606 Three Channel Transformer DC Resistance Tester