Electrical test & measurement equipment · Made in Wuhan, China

Test every asset between the generator and the load

HUAC builds transformer, circuit breaker, cable, high-voltage and protection test equipment for utilities, grid operators and industrial power users. Field-ready instruments, IEC and IEEE test methods, and engineers who answer in your time zone.

Browse test equipment Talk to an engineer

IEC 60076IEC 62271-100IEEE 400.2IEC 60060-1IEC 60255

VLF WITHSTAND · 0.1 Hz SINE · IEEE 400.2 HOLD

Test voltage3.0 U₀

Leakagestable

Elapsed00:00

Example test sequence: very low frequency withstand test on a medium-voltage cable.

10Years in electrical testing

40+Countries supplied

1,000+Instruments delivered

3Years warranty

Products & solutions

Electrical test instruments by asset

Find the right test set by the equipment you maintain.

All 13 products →

Transformer Testing

Ratio, winding, impedance and insulation tests for power and distribution transformers.

IEC 600762 products →

Circuit Breaker Testing

Timing, travel, contact resistance and primary injection for HV and MV switchgear.

IEC 62271-1002 products →

HUAC high voltage bridge cable fault locator in portable case

Cable Testing & Fault Location

Withstand testing, diagnostics and pinpointing faults in MV and HV cable networks.

IEEE 400.2 · IEC 605023 products →

High Voltage & Insulation

AC/DC withstand, insulation resistance and partial discharge measurement.

IEC 60060-1 · IEC 602702 products →

Relay Protection Testing

Secondary injection for protection relays, from single-phase to digital substations.

IEC 60255 · IEC 618501 product →

CT / PT Testing

Excitation, ratio, polarity and burden tests for instrument transformers.

IEC 618691 product →

Grounding & Earth Resistance

Ground grid integrity, earth resistance and step and touch voltage checks.

IEEE 811 product →

Battery & DC Systems

Capacity, internal resistance and ground fault tests for substation DC supplies.

IEC 608961 product →

Featured instruments

Most requested by field teams

All industries →

T&D

Utilities & grid operators

Periodic maintenance testing across transmission and distribution substations.

PLANT

Industrial power users

Switchgear, motors and cables at steel, chemical and mining plants.

EPC

Testing & commissioning contractors

Portable kits for acceptance testing on new substations and EPC projects.

PV · WIND

Renewables

Collector cables, step-up transformers and inverters at wind and solar farms.

CRITICAL

Data centres

Verify UPS batteries, transformers and switchgear that cannot afford downtime.

Why HUAC

Designed, built and calibrated in Wuhan

You buy from the people who build the instrument, so questions about a reading go straight to the engineer who designed it.

Factory directNo reseller margin on direct orders. Distributors get protected territory pricing.
Standards-based testsMeasurement methods and report templates follow IEC and IEEE.
Configured for your gridSupply voltage, plug type and interface language for your market.
OEM and private labelCustom branding and report formats for distributors.

About HUAC Book a factory visit

Customers inspecting HUAC high-voltage test equipment at the factory before shipment

In the field

Delivered, installed and testing

Series resonant AC withstand test in an outdoor substation

On-site high-voltage withstand testing at a substation

Field team running a high-voltage test in a substation

Compatibility & quality

Tests the equipment already in your substation

Used to test transformers, breakers, cables and relays from all major manufacturers, including:

ABBSiemensSchneider ElectricGE VernovaSELHitachi Energy

How ordering works

From test requirement to commissioned instrument

Requirement review

Send the asset ratings and the tests you need to run. We match the instrument and options.

Technical proposal

Datasheet, quotation and sample test report for your approval.

Build and calibrate

Configured for your voltage, frequency and language, then calibrated before shipment.

Ship and clear

Export packing, documents for customs, and tracking to your site.

Commission and train

Remote commissioning and operator training on your first live test.

Knowledge hub

Testing guides for engineers

All articles →

Cable testing · 1 Oct 2026 · 8 min

VLF vs. series resonant testing: which suits your cable?

How cable length, capacitance and site power decide the withstand method.

Transformer · 18 Sept 2026 · 10 min

Reading an SFRA trace after a transformer is moved

What frequency bands reveal winding displacement and core issues.

Switchgear · 2 Sept 2026 · 6 min

Contact resistance limits for HV circuit breakers

Typical acceptance values and why trending beats a single reading.

FAQ

Questions buyers ask first

Can't find your answer? Our sales engineers reply within one business day.

Which test standards do HUAC instruments follow?

Test methods follow the relevant IEC and IEEE standards for each asset, for example IEC 60076 for power transformers, IEC 62271-100 for circuit breakers, IEEE 400.2 for VLF cable testing and IEC 60270 for partial discharge measurement.

Do you ship to Europe, North America and Southeast Asia?

Yes. Instruments are supplied with English software and manuals, and voltage, plug type and labelling are configured for the destination market.

Can distributors order OEM or private-label instruments?

Yes. Distributors can request custom branding, language packs and report templates. Contact the sales team with your target market and volumes.

What support is available after delivery?

Remote commissioning, online operator training, calibration and repair, and spare parts. Software and firmware updates are provided for the instrument's service life.

Where to buy

Request a quote or become a distributor

Tell us the asset and the tests you need to run. A sales engineer will send a recommendation, datasheet and quotation.

Email: jeresxiao@gmail.com
WhatsApp: +447434594200
Factory: Wuhan, Hubei, China
Hours: Mon–Sat, 08:30–18:00 (UTC+8)