Elecgene's AC insulation tester series supports a variety of insulation test methods
Our insulation test equipment helps evaluate insulation condition and performance, enabling effective insulation health assessment
Widely used in substations, power utilities, industrial plants, and electrical maintenance services
The AC voltage test sets are suitable for kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated situation of tested objects.
Separate control and HV units
Continuously adjustable voltage
DC testing via a rectifier
In-built over-current protection
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
Lower input power requirement
Pure AC Sine Wave at output
Easy to combine reactor to output different voltage.
The AC voltage test sets are suitable for kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated situation of tested objects.
Separate control and HV units
Continuously adjustable voltage
DC testing via a rectifier
In-built over-current protection
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
Lower input power requirement
Pure AC Sine Wave at output
Easy to combine reactor to output different voltage.
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
Lower input power requirement
Pure AC Sine Wave at output
Easy to combine reactor to output different voltage.
Advanced test methods such as infrared (IR), pulse induction (PI), and dynamic resistance (DAR) provide reliable assessment of insulation conditions.
Multiple test voltage ranges support various applications in power systems.
Integrate diagnostic and data logging functions, support trend analysis, help users continuously monitor insulation degradation status, and develop scientific predictive maintenance plans.
Built-in automatic discharge and other safety protection functions to ensure safe operation in high-pressure environments.
Sure. You only need to provide the project requirements and the equipment to be tested, etc., and we will recommend a suitable testing plan for you.
Standard products are usually in stock, and delivery can be arranged within 1–3 days after order confirmation. For bulk orders or customized products, it typically takes 2–4 weeks.
We usually provide a quotation within 48 hours after receiving your inquiry.
Yes. We support OEM services.
We support air freight, sea freight, and other common international shipping methods.
Yes. All products come with a 12-month warranty.
The products are CE certified and comply with relevant IEEE/IEC standards.
We provide remote training support, technical support, and related service support. Please contact us for details.
We have extensive project experience both domestically and internationally. You can view case studies on our website or contact us to discuss further.
AC and DC insulation testing evaluate insulation performance in different ways.
AC Insulation Testing
Produces an electric field distribution similar to actual operating conditions.
Does not cause significant space-charge accumulation within insulation materials.
Better reflects insulation behavior under power-frequency voltage stress.
Can be combined with dielectric loss (tan δ) measurements for more comprehensive insulation assessment.
DC Insulation Testing
Applies a constant DC voltage and primarily measures insulation resistance.
Generally requires smaller and more portable test equipment.
Commonly used for routine maintenance and field testing of long cable systems.
Does not provide dielectric loss information.
The choice between AC and DC testing depends on the equipment type, testing objective, and applicable standards.
Most power system equipment operates under 50 Hz or 60 Hz AC voltage. AC insulation testing uses the same type of alternating voltage, allowing the insulation system to be evaluated under electrical stress conditions similar to those experienced during normal service.
Compared with DC testing, AC testing can:
More accurately represent electric field distribution within the insulation system.
Reveal insulation weaknesses that appear under alternating voltage stress.
Better evaluate dielectric losses, partial discharge activity, and insulation aging characteristics.
Provide results that are more representative of actual operating performance.
For this reason, AC testing is widely used for factory acceptance, commissioning, and condition assessment of high-voltage equipment.
AC insulation testing is commonly performed on a wide range of power system equipment, including:
Power transformers and instrument transformers
Dry-type and oil-immersed reactors
Medium- and high-voltage power cables
Switchgear, ring main units (RMUs), and busbar systems
High-voltage motors and generators
Power capacitors and surge arresters
Gas-insulated switchgear (GIS)
Large power electronic equipment, including renewable energy converters and inverter systems
The test helps verify insulation integrity before equipment is placed into service and throughout its operational life.
Dissipation factor, commonly expressed as tan δ (tan delta), is a key indicator of insulation condition. It measures the electrical energy lost within insulation materials when they are subjected to an AC voltage.
A tan delta measurement can provide valuable information about insulation health:
Lower tan delta values generally indicate good insulation condition.
Increasing tan delta values may suggest insulation aging, moisture contamination, or internal defects.
Trending tan delta measurements over time helps identify developing insulation problems before failure occurs.
Tan delta testing is often used alongside AC withstand and insulation tests to provide a more complete assessment of equipment condition.
Because insulation deterioration often develops gradually, tan delta analysis is an effective tool for predictive maintenance and asset management.
Please tell us your testing requirements, application scenarios or project details, and our engineers will recommend the solution and quotation that suits you within 24 hours.
English 
日本語 
한국어 
français 
Deutsch 
русский 
português 
العربية 
